.ai-tutor-fab{position:fixed;right:28px;bottom:28px;z-index:9990;width:60px;height:60px;border-radius:50%;background:#e60012;color:#fff;border:none;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:1px;padding:0;cursor:pointer;box-shadow:0 6px 20px #e6001259;transition:transform .2s ease,box-shadow .2s ease}.ai-tutor-fab:hover{transform:translateY(-2px);box-shadow:0 10px 24px #e6001273}.ai-tutor-fab-emoji{font-size:20px;line-height:1}.ai-tutor-fab-text{font-size:12px;font-weight:700;line-height:1}.ai-tutor-drawer{position:fixed;top:0;right:0;bottom:0;z-index:9995;width:380px;max-width:92vw;background:#fff;display:flex;flex-direction:column;box-shadow:-8px 0 32px #00000024;animation:ai-tutor-slide-in .22s ease}@keyframes ai-tutor-slide-in{0%{transform:translate(100%)}to{transform:translate(0)}}.ai-tutor-header{flex-shrink:0;display:flex;align-items:center;justify-content:space-between;padding:14px 16px;background:#fff;border-bottom:2px solid #e60012}.ai-tutor-header-title{display:flex;align-items:center;gap:10px;min-width:0}.ai-tutor-header-emoji{font-size:24px}.ai-tutor-header-name{margin:0;font-size:15px;font-weight:800;color:#1a1a1a}.ai-tutor-header-page{margin:2px 0 0;font-size:12px;color:#999}.ai-tutor-header-actions{display:flex;gap:6px;flex-shrink:0}.ai-tutor-icon-btn{width:30px;height:30px;border-radius:8px;background:#f5f5f5;color:#666;font-size:14px;line-height:1;display:flex;align-items:center;justify-content:center;cursor:pointer;border:none;transition:background .15s,color .15s}.ai-tutor-icon-btn:hover{background:#fde8ea;color:#e60012}.ai-tutor-profile{flex-shrink:0;padding:14px 16px;background:#fafafa;border-bottom:1px solid #eee;display:flex;flex-direction:column;gap:10px}.ai-tutor-profile-label{display:block;font-size:13px;color:#4b5563;margin:0}.ai-tutor-profile-label input{width:100%;box-sizing:border-box;margin-top:4px;padding:8px 10px;border:1px solid #e0e0e0;border-radius:8px;font-size:13px;outline:none;transition:border-color .2s}.ai-tutor-profile-label input:focus{border-color:#e60012}.ai-tutor-profile-save{align-self:flex-end;padding:8px 20px;border-radius:999px;background:#e60012;color:#fff;font-size:13px;font-weight:600;border:none;cursor:pointer;transition:background .2s}.ai-tutor-profile-save:hover:not(:disabled){background:#c5000f}.ai-tutor-profile-save:disabled{opacity:.6;cursor:not-allowed}.ai-tutor-history{flex-shrink:0;max-height:132px;overflow-y:auto;border-bottom:1px solid #f0f0f0}.ai-tutor-history-item{display:flex;align-items:center;justify-content:space-between;padding:8px 16px;cursor:pointer;border-left:3px solid transparent;transition:background .15s}.ai-tutor-history-item:hover{background:#fafafa}.ai-tutor-history-item-active{background:#fef0f0;border-left-color:#e60012}.ai-tutor-history-title{font-size:13px;color:#333;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;flex:1;min-width:0}.ai-tutor-history-delete{opacity:0;border:none;background:none;color:#e60012;font-size:12px;cursor:pointer;padding:2px 4px;flex-shrink:0;transition:opacity .15s}.ai-tutor-history-item:hover .ai-tutor-history-delete{opacity:1}.ai-tutor-history-delete:hover{text-decoration:underline}.ai-tutor-chat-list{flex:1;overflow-y:auto;padding:16px;background:#f8f8f8}.ai-tutor-msg{display:flex;margin-bottom:12px}.ai-tutor-msg-user{justify-content:flex-end}.ai-tutor-msg-assistant{justify-content:flex-start}.ai-tutor-msg-system{justify-content:center}.ai-tutor-bubble{max-width:82%;padding:10px 14px;border-radius:12px;font-size:14px;line-height:1.55;word-break:break-word;white-space:pre-wrap}.ai-tutor-msg-user .ai-tutor-bubble{background:#e60012;color:#fff;border-bottom-right-radius:4px}.ai-tutor-msg-assistant .ai-tutor-bubble{background:#fff;color:#333;border:1px solid #eee;border-bottom-left-radius:4px}.ai-tutor-bubble-typing{color:#999;font-size:13px}.ai-tutor-empty{text-align:center;padding:40px 12px;color:#999}.ai-tutor-empty-emoji{font-size:36px;margin:0 0 8px}.ai-tutor-empty p{margin:0;font-size:15px;font-weight:700;color:#666}.ai-tutor-empty-sub{margin-top:6px!important;font-size:13px!important;font-weight:400!important;color:#999!important}.ai-tutor-input{flex-shrink:0;display:flex;flex-direction:column;gap:8px;padding:12px 16px 16px;background:#fff;border-top:1px solid #eee}.ai-tutor-error{margin:0;font-size:12px;color:#e60012}.ai-tutor-textarea{width:100%;height:64px;margin:0;padding:10px 12px;border:1px solid #d1d5db;border-radius:10px;font-size:14px;font-family:inherit;resize:none;box-sizing:border-box}.ai-tutor-textarea:focus{outline:none;border-color:#e60012}.ai-tutor-send{align-self:flex-end;background:#e60012;color:#fff;border:none;border-radius:999px;padding:9px 24px;font-size:14px;font-weight:600;cursor:pointer;transition:background .2s}.ai-tutor-send:hover:not(:disabled){background:#c5000f}.ai-tutor-send:disabled{opacity:.6;cursor:not-allowed}.ai-tutor-chat-list::-webkit-scrollbar,.ai-tutor-history::-webkit-scrollbar{width:6px}.ai-tutor-chat-list::-webkit-scrollbar-thumb,.ai-tutor-history::-webkit-scrollbar-thumb{background:#ddd;border-radius:3px}.ai-tutor-chat-list::-webkit-scrollbar-thumb:hover,.ai-tutor-history::-webkit-scrollbar-thumb:hover{background:#bbb}@media(max-width:600px){.ai-tutor-drawer{width:100vw}}.navbar{position:fixed;top:0;left:0;right:0;z-index:1000;display:flex;align-items:center;justify-content:space-between;height:64px;padding:0 48px;background:#fff;border-bottom:1px solid #eee;box-shadow:0 1px 2px #0000000a}.navbar-logo{font-size:24px;font-weight:800;letter-spacing:2px;color:#1a1a1a;text-decoration:none}.navbar-left{display:flex;align-items:center;gap:12px}.navbar-right{display:flex;align-items:center;gap:32px}.navbar-right a{text-decoration:none;font-size:15px;color:#333;transition:color .2s}.navbar-right a:hover{color:#e60012}.navbar-right a.navbar-active{color:#e60012;font-weight:600}.navbar-back{display:inline-flex;align-items:center;justify-content:center;padding:8px;border:none;background:transparent;color:#999;font-size:18px;line-height:1;cursor:pointer;border-radius:8px;transition:color .2s}.navbar-back:hover{color:#1a1a1a}.navbar-email{font-size:14px;color:#666}.navbar-demo-tag{font-size:13px;color:#999;padding:4px 12px;border:1px solid #e0e0e0;border-radius:999px;white-space:nowrap}.navbar-btn{background:#1a1a1a;color:#fff;border-radius:999px;padding:10px 28px;font-size:15px;transition:transform .2s,box-shadow .2s}.navbar-btn:hover{opacity:1;transform:scale(1.05);box-shadow:0 6px 16px #0000002e}@media(max-width:768px){.navbar{padding:0 20px}.navbar-right{gap:16px}}.admin-page{position:relative;min-height:100vh;display:flex;flex-direction:column;background:#f8f8f8;padding-top:64px}.admin-main{flex:1;width:100%;max-width:1120px;margin:0 auto;padding:40px 48px}.admin-title{margin:0 0 12px;font-size:32px;font-weight:800;color:#1a1a1a}.admin-title-row{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:12px}.admin-title-row .admin-title{margin-bottom:0}.admin-enter-learning{flex-shrink:0;padding:10px 22px;background:#e60012;color:#fff;border:none;border-radius:999px;font-size:15px;font-weight:600;cursor:pointer;transition:background .2s,transform .2s,box-shadow .2s}.admin-enter-learning:hover{background:#c5000f;transform:scale(1.03);box-shadow:0 6px 16px #e600123d}.admin-accent{display:block;width:40px;height:4px;margin-bottom:28px;background:#e60012;border-radius:2px}.admin-notice{margin:0 0 16px;padding:10px 14px;border-radius:8px;font-size:13px}.admin-notice-error{background:#fdeaea;color:#e60012}.admin-notice-ok{background:#e8f7ee;color:#1e8e3e}.admin-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-bottom:24px}.admin-stat-card{display:flex;align-items:center;justify-content:space-between;background:#fff;border-radius:16px;padding:24px;box-shadow:0 4px 24px #0000000f}.admin-stat-info{display:flex;flex-direction:column;gap:8px}.admin-stat-value{font-size:36px;font-weight:800;line-height:1;color:#1a1a1a}.admin-stat-label{font-size:14px;color:#666}.admin-stat-icon{width:48px;height:48px;display:flex;align-items:center;justify-content:center;border-radius:12px;font-size:22px}.admin-stat-blue .admin-stat-icon{background:#eaf0fe}.admin-stat-green .admin-stat-icon{background:#e8f7ee}.admin-stat-red .admin-stat-icon{background:#fdeaea}.admin-toolbar{display:flex;align-items:center;gap:12px;margin-bottom:16px;flex-wrap:wrap}.admin-search{display:flex;gap:8px;flex:1;max-width:360px}.admin-search input{flex:1;min-width:0;height:40px;padding:0 14px;border:1px solid #ddd;border-radius:8px;font-size:14px;color:#1a1a1a}.admin-search input:focus{outline:none;border-color:#e60012;box-shadow:0 0 0 3px #e600121f}.admin-search button{height:40px;padding:0 20px;background:#1a1a1a;color:#fff;border-radius:8px;font-size:14px}.admin-filter{height:40px;padding:0 12px;border:1px solid #ddd;border-radius:8px;font-size:14px;color:#1a1a1a;background:#fff}.admin-table-wrap{background:#fff;border-radius:16px;box-shadow:0 4px 24px #0000000f;overflow-x:auto}.admin-table{width:100%;border-collapse:collapse;min-width:860px;font-size:14px}.admin-table thead th{background:#f5f5f5;text-align:left;padding:14px 16px;font-weight:600;color:#333;white-space:nowrap}.admin-table tbody td{padding:14px 16px;border-top:1px solid #f0f0f0;color:#333;white-space:nowrap}.admin-table tbody tr:hover{background:#fafafa}.admin-email{color:#1a1a1a;font-weight:500}.admin-empty{text-align:center;color:#999;padding:32px 0}.admin-role{display:inline-block;padding:3px 10px;border-radius:999px;font-size:12px}.admin-role-admin{background:#fdeaea;color:#e60012}.admin-role-user{background:#f0f0f0;color:#666}.admin-status{display:inline-flex;align-items:center;gap:6px;font-size:13px}.admin-status-online{color:#1e8e3e}.admin-status-offline{color:#999}.admin-status-banned{color:#e60012}.admin-dot{width:8px;height:8px;border-radius:50%;display:inline-block}.admin-dot-green{background:#1e8e3e}.admin-dot-gray{background:#bbb}.admin-dot-red{background:#e60012}.admin-btn{padding:6px 16px;border-radius:999px;font-size:13px;font-weight:600;transition:transform .2s}.admin-btn:hover{transform:scale(1.05)}.admin-btn-ban{background:#e60012;color:#fff}.admin-btn-unban{background:#1a1a1a;color:#fff}.admin-pagination{display:flex;align-items:center;justify-content:center;gap:16px;margin-top:20px}.admin-pagination button{padding:8px 20px;background:#fff;border:1px solid #ddd;border-radius:999px;font-size:14px;color:#333}.admin-pagination button:disabled{opacity:.4;cursor:not-allowed}.admin-pagination span{font-size:14px;color:#666}.admin-modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0006;display:flex;align-items:center;justify-content:center;z-index:1100}.admin-modal{background:#fff;border-radius:16px;padding:28px;width:400px;max-width:90vw;box-shadow:0 12px 48px #0000002e}.admin-modal h3{margin:0 0 8px;font-size:20px;font-weight:800;color:#1a1a1a}.admin-modal-tip{margin:0 0 4px;font-size:14px;color:#666}.admin-modal-email{margin:0 0 20px;font-size:14px;font-weight:600;color:#1a1a1a;word-break:break-all}.admin-modal-days{display:flex;gap:10px;margin-bottom:24px}.admin-day{flex:1;padding:10px 0;border:1px solid #ddd;border-radius:8px;background:#fff;font-size:14px;color:#333}.admin-day-active{border-color:#e60012;color:#e60012;font-weight:600}.admin-modal-actions{display:flex;gap:12px}.admin-modal-cancel,.admin-modal-confirm{flex:1;height:42px;border-radius:999px;font-size:15px;font-weight:600}.admin-modal-cancel{background:#f0f0f0;color:#333}.admin-modal-confirm{background:#e60012;color:#fff}.admin-modal-confirm:disabled{opacity:.6;cursor:not-allowed}@media(max-width:768px){.admin-main{padding:24px 16px}.admin-stats{grid-template-columns:1fr}}.footer{position:relative;z-index:2;display:flex;align-items:center;justify-content:center;height:80px;padding:0 24px;background:#fff;border-top:3px solid #e60012;color:#333;text-align:center}.footer p{margin:0;font-size:14px;letter-spacing:1px}.dashboard{position:relative;min-height:100vh;display:flex;flex-direction:column;background:#f8f8f8;padding-top:64px}.dashboard-main{flex:1;width:100%;max-width:1080px;margin:0 auto;padding:56px 48px 80px}.dashboard-title{margin:0 0 12px;font-size:36px;font-weight:800;color:#1a1a1a}.dashboard-accent{display:block;width:48px;height:4px;margin-bottom:20px;background:#e60012;border-radius:2px}.dashboard-subtitle{margin:0 0 40px;font-size:18px;color:#333}.dashboard-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}.subject-card{position:relative;display:flex;flex-direction:column;align-items:flex-start;background:#fff;border-radius:16px;padding:32px;box-shadow:0 4px 24px #0000000f;overflow:hidden;transition:transform .3s ease,box-shadow .3s ease}.subject-card:hover{transform:translateY(-4px);box-shadow:0 8px 32px #0000001a}.subject-card-bar{position:absolute;top:0;left:0;right:0;height:6px;border-radius:16px 16px 0 0}.subject-card-bar-english{background:#e60012}.subject-card-bar-math{background:#ffc107}.subject-card-bar-cs{background:#1a1a1a}.subject-icon{display:flex;align-items:center;justify-content:center;width:64px;height:64px;margin:12px 0 20px;border-radius:50%;font-size:30px}.subject-icon-english{background:#e60012}.subject-icon-math{background:#ffc107}.subject-icon-cs{background:#1a1a1a}.subject-name{margin:0 0 12px;font-size:24px;font-weight:800;color:#1a1a1a}.subject-desc{margin:0 0 28px;font-size:14px;line-height:1.6;color:#666}.subject-btn{margin-top:auto;background:#1a1a1a;color:#fff;border-radius:999px;padding:10px 28px;font-size:14px;font-weight:600;transition:transform .2s ease,box-shadow .2s ease}.subject-btn:hover{opacity:1;transform:scale(1.05);box-shadow:0 6px 16px #0000002e}@media(max-width:1024px){.dashboard-grid{grid-template-columns:repeat(2,1fr)}}@media(max-width:768px){.dashboard-main{padding:32px 20px 60px}.dashboard-grid{grid-template-columns:1fr}}.auth-page{position:relative;min-height:100vh;display:flex;flex-direction:column;background:#f8f8f8;overflow-x:hidden;padding-top:64px}.auth-main{position:relative;flex:1;display:flex;align-items:center;justify-content:center;gap:48px;width:100%;max-width:1120px;margin:0 auto;padding:48px}.auth-card{position:relative;z-index:1;flex:0 0 420px;background:#fff;border-radius:16px;padding:40px;box-shadow:0 4px 24px #0000000f;animation:auth-card-in .5s ease-out}@keyframes auth-card-in{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.auth-card-title{margin:0 0 12px;font-size:32px;font-weight:800;color:#1a1a1a}.auth-card-accent{display:block;width:40px;height:4px;margin-bottom:28px;background:#e60012;border-radius:2px}.auth-form{display:flex;flex-direction:column}.auth-error{margin:0 0 16px;padding:10px 14px;background:#fdeaea;border-radius:8px;font-size:13px;color:#e60012}.auth-form label{margin-bottom:8px;font-size:14px;color:#666}.auth-form input{height:44px;padding:0 14px;margin-bottom:18px;background:#fff;border:1px solid #ddd;border-radius:8px;font-size:14px;color:#1a1a1a;transition:border-color .2s,box-shadow .2s}.auth-form input:focus{outline:none;border-color:#e60012;box-shadow:0 0 0 3px #e600121f}.auth-submit{width:100%;height:48px;margin-top:6px;padding:0;background:#1a1a1a;color:#fff;border-radius:999px;font-size:16px;font-weight:600;transition:transform .2s ease,box-shadow .2s ease}.auth-submit:hover{opacity:1;transform:scale(1.02);box-shadow:0 12px 28px #00000038}.auth-submit:disabled{opacity:.6;transform:none;box-shadow:none;cursor:not-allowed}.auth-switch{margin-top:24px;text-align:center;font-size:14px;color:#666}.auth-switch a{color:#e60012;text-decoration:none}.auth-switch a:hover{text-decoration:underline}.auth-brand{position:relative;flex:1;display:flex;flex-direction:column;justify-content:center;min-height:360px}.auth-brand-title{position:relative;z-index:1;margin:0 0 16px;font-size:44px;font-weight:800;line-height:1.2;color:#1a1a1a}.auth-brand-subtitle{position:relative;z-index:1;margin:0 0 40px;font-size:18px;color:#333}.auth-illustration{position:relative;z-index:1;display:flex;flex-direction:column;gap:10px;width:100%;max-width:320px}.auth-bubble{max-width:80%;padding:10px 14px;border-radius:14px;font-size:13px;line-height:1.5}.auth-bubble-user{align-self:flex-end;background:#e60012;color:#fff;border-bottom-right-radius:4px}.auth-bubble-bot{align-self:flex-start;background:#fff;color:#333;border:1px solid #eee;border-bottom-left-radius:4px;box-shadow:0 4px 12px #0000000f}.auth-chip{align-self:flex-start;margin-top:6px;padding:8px 18px;background:#1a1a1a;color:#fff;border-radius:999px;font-size:13px}.auth-deco{position:absolute;pointer-events:none;z-index:0}.auth-deco-red{top:0;right:0;width:140px;height:140px;background:#e60012;clip-path:polygon(100% 0,0 0,100% 100%);opacity:.9}.auth-deco-yellow{right:20px;bottom:20px;width:80px;height:80px;background:#ffc107;border-radius:18px;transform:rotate(18deg)}@media(max-width:768px){.auth-main{padding:32px 20px}.auth-card{flex:1 1 auto;width:100%;max-width:420px}.auth-brand{display:none}}.auth-code-row{display:flex;align-items:center;gap:4%;margin-bottom:18px}.auth-code-row .auth-code-input{flex:0 0 60%;margin-bottom:0}.auth-code-btn{flex:0 0 35%;height:44px;padding:0 8px;background:#1a1a1a;color:#fff;border-radius:999px;font-size:14px;font-weight:600;white-space:nowrap;transition:transform .2s,box-shadow .2s}.auth-code-btn:hover:not(:disabled){transform:scale(1.03);box-shadow:0 6px 16px #0000002e}.auth-code-btn:disabled{opacity:.6;cursor:not-allowed}.subject-page{position:relative;min-height:100vh;display:flex;flex-direction:column;background:#f8f8f8;padding-top:64px}.subject-main{flex:1;width:100%;max-width:720px;margin:0 auto;padding:56px 48px 80px;text-align:center}.subject-title{margin:0 0 12px;font-size:40px;font-weight:800;color:#1a1a1a}.subject-accent{display:block;width:48px;height:4px;margin:0 auto 20px;background:#e60012;border-radius:2px}.subject-desc{margin:0;font-size:16px;color:#333}.subject-placeholder{margin-top:60px}.subject-placeholder-title{margin:0 0 12px;font-size:28px;font-weight:800;color:#1a1a1a}.subject-placeholder-sub{margin:0;font-size:16px;color:#666}.subject-construction{position:relative;display:flex;flex-direction:column;align-items:center;margin-bottom:24px}.subject-cone{width:88px;height:76px;background:#ffc107;clip-path:polygon(50% 0,100% 100%,0 100%)}.subject-cone-stripe{position:absolute;top:42px;left:50%;transform:translate(-50%);width:44px;height:12px;background:#e60012;border-radius:2px}.subject-cone-base{width:96px;height:12px;margin-top:4px;background:#ffc107;border-radius:4px}.subject-back{position:fixed;left:40px;bottom:100px;z-index:100;height:40px;padding:0 24px;background:#fff;color:#e60012;border:1px solid #e60012;border-radius:999px;font-size:14px;font-weight:500;cursor:pointer;box-shadow:0 2px 8px #0000000d;transition:all .2s ease}.subject-back:hover{opacity:1;background:#fef0f0;border-color:#e60012;color:#e60012;transform:scale(1.02);box-shadow:0 4px 12px #e6001226}.subject-back:active{transform:scale(.98)}@media(max-width:768px){.subject-main{padding:32px 20px 60px}}.welcome{position:relative;min-height:100vh;display:flex;flex-direction:column;background:#f8f8f8;overflow-x:hidden;padding-top:64px;animation:welcome-fade-in .6s ease-out}@keyframes welcome-fade-in{0%{opacity:0}to{opacity:1}}.welcome-hero{position:relative;z-index:1;flex:1;display:flex;align-items:center;justify-content:space-between;gap:48px;width:100%;max-width:1200px;margin:0 auto;padding:40px 48px 80px}.welcome-left{position:relative;z-index:1;flex:1 1 50%}.welcome-title{margin:0 0 24px;font-size:72px;font-weight:800;line-height:1.1;letter-spacing:2px;color:#1a1a1a}.welcome-subtitle{margin:0 0 40px;font-size:20px;font-weight:400;line-height:1.6;color:#333}.welcome-cta{background:#1a1a1a;color:#fff;border-radius:999px;padding:16px 44px;font-size:18px;font-weight:600;transition:transform .2s ease,box-shadow .2s ease}.welcome-cta:hover{opacity:1;transform:scale(1.02);box-shadow:0 12px 28px #00000038}.welcome-right{position:relative;z-index:1;flex:1 1 50%;display:flex;justify-content:center}.laptop{width:100%;max-width:560px}.laptop-screen{background:#fff;border:10px solid #1a1a1a;border-radius:16px 16px 0 0;height:360px;padding:24px;overflow:hidden;box-shadow:0 20px 40px #0000001f}.laptop-base{width:110%;height:16px;margin-left:-5%;background:#1a1a1a;border-radius:0 0 16px 16px}.ai-ui{display:flex;flex-direction:column;gap:16px;height:100%}.ai-chat{display:flex;flex-direction:column;gap:10px}.ai-bubble{max-width:80%;padding:10px 14px;border-radius:14px;font-size:13px;line-height:1.5}.ai-bubble-user{align-self:flex-end;background:#e60012;color:#fff;border-bottom-right-radius:4px}.ai-bubble-bot{align-self:flex-start;background:#f0f0f0;color:#333;border-bottom-left-radius:4px}.ai-cards{display:flex;gap:12px}.ai-card{flex:1;background:#fff;border:1px solid #eee;border-radius:12px;padding:14px;box-shadow:0 4px 12px #0000000f}.ai-card-title{margin-bottom:10px;font-size:13px;font-weight:600;color:#1a1a1a}.ai-card-line{height:8px;margin-bottom:8px;background:#e6e6e6;border-radius:4px}.ai-card-line.short{width:60%}.deco{position:absolute;pointer-events:none;z-index:0}.deco-red{top:-20px;right:0;width:160px;height:160px;background:#e60012;clip-path:polygon(100% 0,0 0,100% 100%);opacity:.9}.deco-yellow{right:20px;bottom:20px;width:90px;height:90px;background:#ffc107;border-radius:20px;transform:rotate(18deg)}@media(max-width:768px){.welcome-hero{flex-direction:column;gap:32px;padding:24px 20px 60px;text-align:center}.welcome-title{font-size:48px}.welcome-subtitle{font-size:17px}.welcome-right{display:none}}.english-page{height:100vh;overflow:hidden;display:flex;flex-direction:column;background:#f8f8f8;padding-top:64px}.english-layout{flex:1;display:flex;min-height:0}.english-sidebar{width:240px;flex-shrink:0;background:#fff;border-right:1px solid #eee;display:flex;flex-direction:column;overflow-y:auto}.english-sidebar-title{padding:24px 20px 20px}.english-sidebar-title h1{margin:0 0 4px;font-size:24px;font-weight:800;color:#1a1a1a}.english-sidebar-title p{margin:0 0 12px;font-size:12px;color:#999}.english-sidebar-accent{display:block;width:32px;height:3px;background:#e60012;border-radius:2px}.english-menu{display:flex;flex-direction:column;padding:8px 0}.english-menu-item{position:relative;display:flex;align-items:center;gap:12px;width:100%;height:48px;padding:0 20px;background:transparent;color:#333;border:none;border-radius:0;font-size:15px;text-align:left;text-decoration:none;transition:background .2s,color .2s}.english-menu-item:hover{opacity:1;background:#f5f5f5}.english-menu-item-active{color:#e60012;background:#fef0f0;font-weight:600}.english-menu-item-active:hover{background:#fef0f0}.english-menu-item-active:before{content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background:#e60012}.english-menu-icon{font-size:18px}.english-data{margin-top:auto;padding:20px;border-top:1px solid #f0f0f0}.english-data h3{margin:0 0 12px;font-size:14px;font-weight:700;color:#1a1a1a}.english-data-item{display:flex;align-items:center;gap:8px;margin-bottom:8px;font-size:13px;color:#666}.english-data-item:last-child{margin-bottom:0}.english-data-icon{font-size:14px}.english-data-label{flex:1}.english-data-value{color:#333;text-align:right}.english-content{flex:1;min-width:0;padding:40px;overflow-y:auto}.english-content-fill{display:flex;flex-direction:column;padding:0;overflow:hidden}.english-content-title{margin:0 0 12px;font-size:32px;font-weight:800;color:#1a1a1a}.english-content-accent{display:block;width:40px;height:4px;margin-bottom:20px;background:#e60012;border-radius:2px}.english-content-intro{margin:0 0 28px;font-size:16px;color:#333}.english-detail-card{background:#fff;border-radius:16px;padding:32px;box-shadow:0 4px 24px #0000000f}.english-detail-section{line-height:1.8}.english-detail-section+.english-detail-section{margin-top:32px;padding-top:32px;border-top:1px solid #f0f0f0}.english-detail-heading{position:relative;margin:0 0 12px;padding-left:14px;font-size:18px;font-weight:700;color:#1a1a1a}.english-detail-heading:before{content:"";position:absolute;left:0;top:50%;transform:translateY(-50%);width:6px;height:6px;border-radius:50%;background:#e60012}.english-detail-list{margin:0;padding:0;list-style:none;font-size:14px;color:#444}.english-detail-list li{margin:0 0 8px 8px}.english-detail-list li:last-child{margin-bottom:0}.english-detail-list li:before{content:"·";margin-right:8px;color:#999;font-weight:700}.english-start-btn{display:flex;align-items:center;justify-content:center;margin-top:32px;width:200px;height:48px;background:#1a1a1a;color:#fff;border-radius:999px;font-size:16px;font-weight:600;transition:transform .2s ease,box-shadow .2s ease}.english-start-btn:hover{opacity:1;transform:scale(1.03);box-shadow:0 8px 20px #0003}@media(max-width:768px){.english-page{height:auto;min-height:100vh;overflow:visible}.english-layout{flex-direction:column}.english-sidebar{width:100%;height:auto;border-right:none;border-bottom:1px solid #eee}.english-content{padding:24px 20px;overflow:visible}.english-start-btn{width:100%}}.math-page{height:100vh;overflow:hidden;display:flex;flex-direction:column;background:#f8f8f8;padding-top:64px}.math-layout{flex:1;display:flex;min-height:0}.math-sidebar{width:240px;flex-shrink:0;background:#fff;border-right:1px solid #eee;display:flex;flex-direction:column;overflow-y:auto}.math-sidebar-title{padding:20px}.math-back{display:inline-flex;align-items:center;gap:6px;margin-bottom:16px;padding:0;background:transparent;border:none;color:#e60012;font-size:13px;font-weight:600;cursor:pointer;transition:opacity .2s}.math-back:hover{opacity:.75}.math-sidebar-title h1{margin:0 0 4px;font-size:24px;font-weight:800;color:#1a1a1a}.math-sidebar-title p{margin:0 0 12px;font-size:12px;color:#999}.math-sidebar-accent{display:block;width:32px;height:3px;background:#e60012;border-radius:2px}.math-menu{display:flex;flex-direction:column;padding:8px 0}.math-menu-item{position:relative;display:flex;align-items:center;gap:12px;width:100%;height:48px;padding:0 20px;background:transparent;color:#333;border:none;border-radius:0;font-size:15px;text-align:left;text-decoration:none;transition:background .2s,color .2s}.math-menu-item:hover{opacity:1;background:#f5f5f5}.math-menu-item-active{color:#e60012;background:#fef0f0;font-weight:600}.math-menu-item-active:hover{background:#fef0f0}.math-menu-item-active:before{content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background:#e60012}.math-menu-icon{font-size:18px}.math-content-area{flex:1;min-width:0;padding:40px;overflow-y:auto}.math-content{max-width:960px;margin:0 auto}.math-content-title{margin:0;font-size:32px;font-weight:800;color:#1a1a1a;line-height:1.2}.math-content-accent{display:block;width:40px;height:4px;margin-top:12px;background:#e60012;border-radius:2px}.math-content-subtitle{margin:12px 0 0;font-size:16px;color:#333}.math-content-header{margin-bottom:28px}@media(max-width:768px){.math-page{height:auto;min-height:100vh;overflow:visible}.math-layout{flex-direction:column}.math-sidebar{width:100%;height:auto;border-right:none;border-bottom:1px solid #eee}.math-content-area{padding:24px 20px;overflow:visible}}.video-section{display:flex;flex-direction:column;gap:16px}.video-chapter{position:relative;margin:0 0 4px;padding-left:14px;font-size:18px;font-weight:800;color:#1a1a1a}.video-chapter:before{content:"";position:absolute;left:0;top:50%;transform:translateY(-50%);width:6px;height:6px;border-radius:50%;background:#e60012}.video-card{display:flex;align-items:center;gap:24px;background:#fff;border-radius:16px;padding:28px 32px;box-shadow:0 4px 24px #0000000f}.video-card-body{flex:1;min-width:0}.video-title{margin:0 0 8px;font-size:20px;font-weight:800;color:#1a1a1a}.video-desc{margin:0;font-size:14px;line-height:1.6;color:#666}.video-btn{flex-shrink:0;display:inline-flex;align-items:center;gap:6px;padding:12px 24px;background:#e60012;color:#fff;border-radius:999px;font-size:14px;font-weight:600;text-decoration:none;transition:transform .2s ease,box-shadow .2s ease}.video-btn:hover{opacity:1;transform:scale(1.03);box-shadow:0 8px 20px #e6001240}.video-placeholder{display:flex;align-items:center;justify-content:center;min-height:120px;background:#fff;border:1px dashed #e5e5e5;border-radius:16px}.video-placeholder-text{margin:0;font-size:14px;color:#bbb}@media(max-width:768px){.video-card{flex-direction:column;align-items:stretch}.video-btn{justify-content:center}}@font-face{font-display:block;font-family:KaTeX_AMS;font-style:normal;font-weight:400;src:url(/assets/KaTeX_AMS-Regular-BQhdFMY1.woff2) format("woff2"),url(/assets/KaTeX_AMS-Regular-DMm9YOAa.woff) format("woff"),url(/assets/KaTeX_AMS-Regular-DRggAlZN.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Caligraphic;font-style:normal;font-weight:700;src:url(/assets/KaTeX_Caligraphic-Bold-Dq_IR9rO.woff2) format("woff2"),url(/assets/KaTeX_Caligraphic-Bold-BEiXGLvX.woff) format("woff"),url(/assets/KaTeX_Caligraphic-Bold-ATXxdsX0.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Caligraphic;font-style:normal;font-weight:400;src:url(/assets/KaTeX_Caligraphic-Regular-Di6jR-x-.woff2) format("woff2"),url(/assets/KaTeX_Caligraphic-Regular-CTRA-rTL.woff) format("woff"),url(/assets/KaTeX_Caligraphic-Regular-wX97UBjC.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Fraktur;font-style:normal;font-weight:700;src:url(/assets/KaTeX_Fraktur-Bold-CL6g_b3V.woff2) format("woff2"),url(/assets/KaTeX_Fraktur-Bold-BsDP51OF.woff) format("woff"),url(/assets/KaTeX_Fraktur-Bold-BdnERNNW.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Fraktur;font-style:normal;font-weight:400;src:url(/assets/KaTeX_Fraktur-Regular-CTYiF6lA.woff2) format("woff2"),url(/assets/KaTeX_Fraktur-Regular-Dxdc4cR9.woff) format("woff"),url(/assets/KaTeX_Fraktur-Regular-CB_wures.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Main;font-style:normal;font-weight:700;src:url(/assets/KaTeX_Main-Bold-Cx986IdX.woff2) format("woff2"),url(/assets/KaTeX_Main-Bold-Jm3AIy58.woff) format("woff"),url(/assets/KaTeX_Main-Bold-waoOVXN0.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Main;font-style:italic;font-weight:700;src:url(/assets/KaTeX_Main-BoldItalic-DxDJ3AOS.woff2) format("woff2"),url(/assets/KaTeX_Main-BoldItalic-SpSLRI95.woff) format("woff"),url(/assets/KaTeX_Main-BoldItalic-DzxPMmG6.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Main;font-style:italic;font-weight:400;src:url(/assets/KaTeX_Main-Italic-NWA7e6Wa.woff2) format("woff2"),url(/assets/KaTeX_Main-Italic-BMLOBm91.woff) format("woff"),url(/assets/KaTeX_Main-Italic-3WenGoN9.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Main;font-style:normal;font-weight:400;src:url(/assets/KaTeX_Main-Regular-B22Nviop.woff2) format("woff2"),url(/assets/KaTeX_Main-Regular-Dr94JaBh.woff) format("woff"),url(/assets/KaTeX_Main-Regular-ypZvNtVU.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Math;font-style:italic;font-weight:700;src:url(/assets/KaTeX_Math-BoldItalic-CZnvNsCZ.woff2) format("woff2"),url(/assets/KaTeX_Math-BoldItalic-iY-2wyZ7.woff) format("woff"),url(/assets/KaTeX_Math-BoldItalic-B3XSjfu4.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Math;font-style:italic;font-weight:400;src:url(/assets/KaTeX_Math-Italic-t53AETM-.woff2) format("woff2"),url(/assets/KaTeX_Math-Italic-DA0__PXp.woff) format("woff"),url(/assets/KaTeX_Math-Italic-flOr_0UB.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_SansSerif;font-style:normal;font-weight:700;src:url(/assets/KaTeX_SansSerif-Bold-D1sUS0GD.woff2) format("woff2"),url(/assets/KaTeX_SansSerif-Bold-DbIhKOiC.woff) format("woff"),url(/assets/KaTeX_SansSerif-Bold-CFMepnvq.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_SansSerif;font-style:italic;font-weight:400;src:url(/assets/KaTeX_SansSerif-Italic-C3H0VqGB.woff2) format("woff2"),url(/assets/KaTeX_SansSerif-Italic-DN2j7dab.woff) format("woff"),url(/assets/KaTeX_SansSerif-Italic-YYjJ1zSn.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_SansSerif;font-style:normal;font-weight:400;src:url(/assets/KaTeX_SansSerif-Regular-DDBCnlJ7.woff2) format("woff2"),url(/assets/KaTeX_SansSerif-Regular-CS6fqUqJ.woff) format("woff"),url(/assets/KaTeX_SansSerif-Regular-BNo7hRIc.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Script;font-style:normal;font-weight:400;src:url(/assets/KaTeX_Script-Regular-D3wIWfF6.woff2) format("woff2"),url(/assets/KaTeX_Script-Regular-D5yQViql.woff) format("woff"),url(/assets/KaTeX_Script-Regular-C5JkGWo-.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Size1;font-style:normal;font-weight:400;src:url(/assets/KaTeX_Size1-Regular-mCD8mA8B.woff2) format("woff2"),url(/assets/KaTeX_Size1-Regular-C195tn64.woff) format("woff"),url(/assets/KaTeX_Size1-Regular-Dbsnue_I.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Size2;font-style:normal;font-weight:400;src:url(/assets/KaTeX_Size2-Regular-Dy4dx90m.woff2) format("woff2"),url(/assets/KaTeX_Size2-Regular-oD1tc_U0.woff) format("woff"),url(/assets/KaTeX_Size2-Regular-B7gKUWhC.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Size3;font-style:normal;font-weight:400;src:url(data:font/woff2;base64,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) format("woff2"),url(/assets/KaTeX_Size3-Regular-CTq5MqoE.woff) format("woff"),url(/assets/KaTeX_Size3-Regular-DgpXs0kz.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Size4;font-style:normal;font-weight:400;src:url(/assets/KaTeX_Size4-Regular-Dl5lxZxV.woff2) format("woff2"),url(/assets/KaTeX_Size4-Regular-BF-4gkZK.woff) format("woff"),url(/assets/KaTeX_Size4-Regular-DWFBv043.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Typewriter;font-style:normal;font-weight:400;src:url(/assets/KaTeX_Typewriter-Regular-CO6r4hn1.woff2) format("woff2"),url(/assets/KaTeX_Typewriter-Regular-C0xS9mPB.woff) format("woff"),url(/assets/KaTeX_Typewriter-Regular-D3Ib7_Hf.ttf) format("truetype")}.katex{font: 1.21em KaTeX_Main,Times New Roman,serif;line-height:1.2;position:relative;text-indent:0;text-rendering:auto}.katex *{-ms-high-contrast-adjust:none!important;border-color:currentColor}.katex .katex-version:after{content:"0.16.47"}.katex .katex-mathml{border:0;-webkit-clip-path:inset(50%);clip-path:inset(50%);height:1px;overflow:hidden;padding:0;position:absolute;width:1px}.katex .katex-html>.newline{display:block}.katex .base{position:relative;white-space:nowrap;width:-webkit-min-content;width:-moz-min-content;width:min-content}.katex .base,.katex .strut{display:inline-block}.katex .textbf{font-weight:700}.katex .textit{font-style:italic}.katex .textrm{font-family:KaTeX_Main}.katex .textsf{font-family:KaTeX_SansSerif}.katex .texttt{font-family:KaTeX_Typewriter}.katex .mathnormal{font-family:KaTeX_Math;font-style:italic}.katex .mathit{font-family:KaTeX_Main;font-style:italic}.katex .mathrm{font-style:normal}.katex .mathbf{font-family:KaTeX_Main;font-weight:700}.katex .boldsymbol{font-family:KaTeX_Math;font-style:italic;font-weight:700}.katex .amsrm,.katex .mathbb,.katex .textbb{font-family:KaTeX_AMS}.katex .mathcal{font-family:KaTeX_Caligraphic}.katex .mathfrak,.katex .textfrak{font-family:KaTeX_Fraktur}.katex .mathboldfrak,.katex .textboldfrak{font-family:KaTeX_Fraktur;font-weight:700}.katex .mathtt{font-family:KaTeX_Typewriter}.katex .mathscr,.katex .textscr{font-family:KaTeX_Script}.katex .mathsf,.katex .textsf{font-family:KaTeX_SansSerif}.katex .mathboldsf,.katex .textboldsf{font-family:KaTeX_SansSerif;font-weight:700}.katex .mathitsf,.katex .mathsfit,.katex .textitsf{font-family:KaTeX_SansSerif;font-style:italic}.katex .mainrm{font-family:KaTeX_Main;font-style:normal}.katex .vlist-t{border-collapse:collapse;display:inline-table;table-layout:fixed}.katex .vlist-r{display:table-row}.katex .vlist{display:table-cell;position:relative;vertical-align:bottom}.katex .vlist>span{display:block;height:0;position:relative}.katex .vlist>span>span{display:inline-block}.katex .vlist>span>.pstrut{overflow:hidden;width:0}.katex .vlist-t2{margin-right:-2px}.katex .vlist-s{display:table-cell;font-size:1px;min-width:2px;vertical-align:bottom;width:2px}.katex .vbox{align-items:baseline;display:inline-flex;flex-direction:column}.katex .hbox{width:100%}.katex .hbox,.katex .thinbox{display:inline-flex;flex-direction:row}.katex .thinbox{max-width:0;width:0}.katex .msupsub{text-align:left}.katex .mfrac>span>span{text-align:center}.katex .mfrac .frac-line{border-bottom-style:solid;display:inline-block;width:100%}.katex .hdashline,.katex .hline,.katex .mfrac .frac-line,.katex .overline .overline-line,.katex .rule,.katex .underline .underline-line{min-height:1px}.katex .mspace{display:inline-block}.katex .smash{display:inline;line-height:0}.katex .clap,.katex .llap,.katex .rlap{position:relative;width:0}.katex .clap>.inner,.katex .llap>.inner,.katex .rlap>.inner{position:absolute}.katex .clap>.fix,.katex .llap>.fix,.katex .rlap>.fix{display:inline-block}.katex .llap>.inner{right:0}.katex .clap>.inner,.katex .rlap>.inner{left:0}.katex .clap>.inner>span{margin-left:-50%;margin-right:50%}.katex .rule{border:0 solid;display:inline-block;position:relative}.katex .hline,.katex .overline .overline-line,.katex .underline .underline-line{border-bottom-style:solid;display:inline-block;width:100%}.katex .hdashline{border-bottom-style:dashed;display:inline-block;width:100%}.katex .sqrt>.root{margin-left:.2777777778em;margin-right:-.5555555556em}.katex .fontsize-ensurer.reset-size1.size1,.katex .sizing.reset-size1.size1{font-size:1em}.katex .fontsize-ensurer.reset-size1.size2,.katex .sizing.reset-size1.size2{font-size:1.2em}.katex .fontsize-ensurer.reset-size1.size3,.katex .sizing.reset-size1.size3{font-size:1.4em}.katex .fontsize-ensurer.reset-size1.size4,.katex .sizing.reset-size1.size4{font-size:1.6em}.katex .fontsize-ensurer.reset-size1.size5,.katex .sizing.reset-size1.size5{font-size:1.8em}.katex .fontsize-ensurer.reset-size1.size6,.katex .sizing.reset-size1.size6{font-size:2em}.katex .fontsize-ensurer.reset-size1.size7,.katex .sizing.reset-size1.size7{font-size:2.4em}.katex .fontsize-ensurer.reset-size1.size8,.katex .sizing.reset-size1.size8{font-size:2.88em}.katex .fontsize-ensurer.reset-size1.size9,.katex .sizing.reset-size1.size9{font-size:3.456em}.katex .fontsize-ensurer.reset-size1.size10,.katex .sizing.reset-size1.size10{font-size:4.148em}.katex .fontsize-ensurer.reset-size1.size11,.katex .sizing.reset-size1.size11{font-size:4.976em}.katex .fontsize-ensurer.reset-size2.size1,.katex .sizing.reset-size2.size1{font-size:.8333333333em}.katex .fontsize-ensurer.reset-size2.size2,.katex .sizing.reset-size2.size2{font-size:1em}.katex .fontsize-ensurer.reset-size2.size3,.katex .sizing.reset-size2.size3{font-size:1.1666666667em}.katex .fontsize-ensurer.reset-size2.size4,.katex .sizing.reset-size2.size4{font-size:1.3333333333em}.katex .fontsize-ensurer.reset-size2.size5,.katex .sizing.reset-size2.size5{font-size:1.5em}.katex .fontsize-ensurer.reset-size2.size6,.katex .sizing.reset-size2.size6{font-size:1.6666666667em}.katex .fontsize-ensurer.reset-size2.size7,.katex .sizing.reset-size2.size7{font-size:2em}.katex .fontsize-ensurer.reset-size2.size8,.katex .sizing.reset-size2.size8{font-size:2.4em}.katex .fontsize-ensurer.reset-size2.size9,.katex .sizing.reset-size2.size9{font-size:2.88em}.katex .fontsize-ensurer.reset-size2.size10,.katex .sizing.reset-size2.size10{font-size:3.4566666667em}.katex .fontsize-ensurer.reset-size2.size11,.katex .sizing.reset-size2.size11{font-size:4.1466666667em}.katex .fontsize-ensurer.reset-size3.size1,.katex .sizing.reset-size3.size1{font-size:.7142857143em}.katex .fontsize-ensurer.reset-size3.size2,.katex .sizing.reset-size3.size2{font-size:.8571428571em}.katex .fontsize-ensurer.reset-size3.size3,.katex .sizing.reset-size3.size3{font-size:1em}.katex .fontsize-ensurer.reset-size3.size4,.katex .sizing.reset-size3.size4{font-size:1.1428571429em}.katex .fontsize-ensurer.reset-size3.size5,.katex .sizing.reset-size3.size5{font-size:1.2857142857em}.katex .fontsize-ensurer.reset-size3.size6,.katex .sizing.reset-size3.size6{font-size:1.4285714286em}.katex .fontsize-ensurer.reset-size3.size7,.katex .sizing.reset-size3.size7{font-size:1.7142857143em}.katex .fontsize-ensurer.reset-size3.size8,.katex .sizing.reset-size3.size8{font-size:2.0571428571em}.katex .fontsize-ensurer.reset-size3.size9,.katex .sizing.reset-size3.size9{font-size:2.4685714286em}.katex .fontsize-ensurer.reset-size3.size10,.katex .sizing.reset-size3.size10{font-size:2.9628571429em}.katex .fontsize-ensurer.reset-size3.size11,.katex .sizing.reset-size3.size11{font-size:3.5542857143em}.katex .fontsize-ensurer.reset-size4.size1,.katex .sizing.reset-size4.size1{font-size:.625em}.katex .fontsize-ensurer.reset-size4.size2,.katex .sizing.reset-size4.size2{font-size:.75em}.katex .fontsize-ensurer.reset-size4.size3,.katex .sizing.reset-size4.size3{font-size:.875em}.katex .fontsize-ensurer.reset-size4.size4,.katex .sizing.reset-size4.size4{font-size:1em}.katex .fontsize-ensurer.reset-size4.size5,.katex .sizing.reset-size4.size5{font-size:1.125em}.katex .fontsize-ensurer.reset-size4.size6,.katex .sizing.reset-size4.size6{font-size:1.25em}.katex .fontsize-ensurer.reset-size4.size7,.katex .sizing.reset-size4.size7{font-size:1.5em}.katex .fontsize-ensurer.reset-size4.size8,.katex .sizing.reset-size4.size8{font-size:1.8em}.katex .fontsize-ensurer.reset-size4.size9,.katex .sizing.reset-size4.size9{font-size:2.16em}.katex .fontsize-ensurer.reset-size4.size10,.katex .sizing.reset-size4.size10{font-size:2.5925em}.katex .fontsize-ensurer.reset-size4.size11,.katex .sizing.reset-size4.size11{font-size:3.11em}.katex .fontsize-ensurer.reset-size5.size1,.katex .sizing.reset-size5.size1{font-size:.5555555556em}.katex .fontsize-ensurer.reset-size5.size2,.katex .sizing.reset-size5.size2{font-size:.6666666667em}.katex .fontsize-ensurer.reset-size5.size3,.katex .sizing.reset-size5.size3{font-size:.7777777778em}.katex .fontsize-ensurer.reset-size5.size4,.katex .sizing.reset-size5.size4{font-size:.8888888889em}.katex .fontsize-ensurer.reset-size5.size5,.katex .sizing.reset-size5.size5{font-size:1em}.katex .fontsize-ensurer.reset-size5.size6,.katex .sizing.reset-size5.size6{font-size:1.1111111111em}.katex .fontsize-ensurer.reset-size5.size7,.katex .sizing.reset-size5.size7{font-size:1.3333333333em}.katex .fontsize-ensurer.reset-size5.size8,.katex .sizing.reset-size5.size8{font-size:1.6em}.katex .fontsize-ensurer.reset-size5.size9,.katex .sizing.reset-size5.size9{font-size:1.92em}.katex .fontsize-ensurer.reset-size5.size10,.katex .sizing.reset-size5.size10{font-size:2.3044444444em}.katex .fontsize-ensurer.reset-size5.size11,.katex .sizing.reset-size5.size11{font-size:2.7644444444em}.katex .fontsize-ensurer.reset-size6.size1,.katex .sizing.reset-size6.size1{font-size:.5em}.katex .fontsize-ensurer.reset-size6.size2,.katex .sizing.reset-size6.size2{font-size:.6em}.katex .fontsize-ensurer.reset-size6.size3,.katex .sizing.reset-size6.size3{font-size:.7em}.katex .fontsize-ensurer.reset-size6.size4,.katex .sizing.reset-size6.size4{font-size:.8em}.katex .fontsize-ensurer.reset-size6.size5,.katex .sizing.reset-size6.size5{font-size:.9em}.katex .fontsize-ensurer.reset-size6.size6,.katex .sizing.reset-size6.size6{font-size:1em}.katex .fontsize-ensurer.reset-size6.size7,.katex .sizing.reset-size6.size7{font-size:1.2em}.katex .fontsize-ensurer.reset-size6.size8,.katex .sizing.reset-size6.size8{font-size:1.44em}.katex .fontsize-ensurer.reset-size6.size9,.katex .sizing.reset-size6.size9{font-size:1.728em}.katex .fontsize-ensurer.reset-size6.size10,.katex .sizing.reset-size6.size10{font-size:2.074em}.katex .fontsize-ensurer.reset-size6.size11,.katex .sizing.reset-size6.size11{font-size:2.488em}.katex .fontsize-ensurer.reset-size7.size1,.katex .sizing.reset-size7.size1{font-size:.4166666667em}.katex .fontsize-ensurer.reset-size7.size2,.katex .sizing.reset-size7.size2{font-size:.5em}.katex .fontsize-ensurer.reset-size7.size3,.katex .sizing.reset-size7.size3{font-size:.5833333333em}.katex .fontsize-ensurer.reset-size7.size4,.katex .sizing.reset-size7.size4{font-size:.6666666667em}.katex .fontsize-ensurer.reset-size7.size5,.katex .sizing.reset-size7.size5{font-size:.75em}.katex .fontsize-ensurer.reset-size7.size6,.katex .sizing.reset-size7.size6{font-size:.8333333333em}.katex .fontsize-ensurer.reset-size7.size7,.katex .sizing.reset-size7.size7{font-size:1em}.katex .fontsize-ensurer.reset-size7.size8,.katex .sizing.reset-size7.size8{font-size:1.2em}.katex .fontsize-ensurer.reset-size7.size9,.katex .sizing.reset-size7.size9{font-size:1.44em}.katex .fontsize-ensurer.reset-size7.size10,.katex .sizing.reset-size7.size10{font-size:1.7283333333em}.katex .fontsize-ensurer.reset-size7.size11,.katex .sizing.reset-size7.size11{font-size:2.0733333333em}.katex .fontsize-ensurer.reset-size8.size1,.katex .sizing.reset-size8.size1{font-size:.3472222222em}.katex .fontsize-ensurer.reset-size8.size2,.katex .sizing.reset-size8.size2{font-size:.4166666667em}.katex .fontsize-ensurer.reset-size8.size3,.katex .sizing.reset-size8.size3{font-size:.4861111111em}.katex .fontsize-ensurer.reset-size8.size4,.katex .sizing.reset-size8.size4{font-size:.5555555556em}.katex .fontsize-ensurer.reset-size8.size5,.katex .sizing.reset-size8.size5{font-size:.625em}.katex .fontsize-ensurer.reset-size8.size6,.katex .sizing.reset-size8.size6{font-size:.6944444444em}.katex .fontsize-ensurer.reset-size8.size7,.katex .sizing.reset-size8.size7{font-size:.8333333333em}.katex .fontsize-ensurer.reset-size8.size8,.katex .sizing.reset-size8.size8{font-size:1em}.katex .fontsize-ensurer.reset-size8.size9,.katex .sizing.reset-size8.size9{font-size:1.2em}.katex .fontsize-ensurer.reset-size8.size10,.katex .sizing.reset-size8.size10{font-size:1.4402777778em}.katex .fontsize-ensurer.reset-size8.size11,.katex .sizing.reset-size8.size11{font-size:1.7277777778em}.katex .fontsize-ensurer.reset-size9.size1,.katex .sizing.reset-size9.size1{font-size:.2893518519em}.katex .fontsize-ensurer.reset-size9.size2,.katex .sizing.reset-size9.size2{font-size:.3472222222em}.katex .fontsize-ensurer.reset-size9.size3,.katex .sizing.reset-size9.size3{font-size:.4050925926em}.katex .fontsize-ensurer.reset-size9.size4,.katex .sizing.reset-size9.size4{font-size:.462962963em}.katex .fontsize-ensurer.reset-size9.size5,.katex .sizing.reset-size9.size5{font-size:.5208333333em}.katex .fontsize-ensurer.reset-size9.size6,.katex .sizing.reset-size9.size6{font-size:.5787037037em}.katex .fontsize-ensurer.reset-size9.size7,.katex .sizing.reset-size9.size7{font-size:.6944444444em}.katex .fontsize-ensurer.reset-size9.size8,.katex .sizing.reset-size9.size8{font-size:.8333333333em}.katex .fontsize-ensurer.reset-size9.size9,.katex .sizing.reset-size9.size9{font-size:1em}.katex .fontsize-ensurer.reset-size9.size10,.katex .sizing.reset-size9.size10{font-size:1.2002314815em}.katex .fontsize-ensurer.reset-size9.size11,.katex .sizing.reset-size9.size11{font-size:1.4398148148em}.katex .fontsize-ensurer.reset-size10.size1,.katex .sizing.reset-size10.size1{font-size:.2410800386em}.katex .fontsize-ensurer.reset-size10.size2,.katex .sizing.reset-size10.size2{font-size:.2892960463em}.katex .fontsize-ensurer.reset-size10.size3,.katex .sizing.reset-size10.size3{font-size:.337512054em}.katex .fontsize-ensurer.reset-size10.size4,.katex .sizing.reset-size10.size4{font-size:.3857280617em}.katex .fontsize-ensurer.reset-size10.size5,.katex .sizing.reset-size10.size5{font-size:.4339440694em}.katex .fontsize-ensurer.reset-size10.size6,.katex .sizing.reset-size10.size6{font-size:.4821600771em}.katex .fontsize-ensurer.reset-size10.size7,.katex .sizing.reset-size10.size7{font-size:.5785920926em}.katex .fontsize-ensurer.reset-size10.size8,.katex .sizing.reset-size10.size8{font-size:.6943105111em}.katex .fontsize-ensurer.reset-size10.size9,.katex .sizing.reset-size10.size9{font-size:.8331726133em}.katex .fontsize-ensurer.reset-size10.size10,.katex .sizing.reset-size10.size10{font-size:1em}.katex .fontsize-ensurer.reset-size10.size11,.katex .sizing.reset-size10.size11{font-size:1.1996142719em}.katex .fontsize-ensurer.reset-size11.size1,.katex .sizing.reset-size11.size1{font-size:.2009646302em}.katex .fontsize-ensurer.reset-size11.size2,.katex .sizing.reset-size11.size2{font-size:.2411575563em}.katex .fontsize-ensurer.reset-size11.size3,.katex .sizing.reset-size11.size3{font-size:.2813504823em}.katex .fontsize-ensurer.reset-size11.size4,.katex .sizing.reset-size11.size4{font-size:.3215434084em}.katex .fontsize-ensurer.reset-size11.size5,.katex .sizing.reset-size11.size5{font-size:.3617363344em}.katex .fontsize-ensurer.reset-size11.size6,.katex .sizing.reset-size11.size6{font-size:.4019292605em}.katex .fontsize-ensurer.reset-size11.size7,.katex .sizing.reset-size11.size7{font-size:.4823151125em}.katex .fontsize-ensurer.reset-size11.size8,.katex .sizing.reset-size11.size8{font-size:.578778135em}.katex .fontsize-ensurer.reset-size11.size9,.katex .sizing.reset-size11.size9{font-size:.6945337621em}.katex .fontsize-ensurer.reset-size11.size10,.katex .sizing.reset-size11.size10{font-size:.8336012862em}.katex .fontsize-ensurer.reset-size11.size11,.katex .sizing.reset-size11.size11{font-size:1em}.katex .delimsizing.size1{font-family:KaTeX_Size1}.katex .delimsizing.size2{font-family:KaTeX_Size2}.katex .delimsizing.size3{font-family:KaTeX_Size3}.katex .delimsizing.size4{font-family:KaTeX_Size4}.katex .delimsizing.mult .delim-size1>span{font-family:KaTeX_Size1}.katex .delimsizing.mult .delim-size4>span{font-family:KaTeX_Size4}.katex .nulldelimiter{display:inline-block;width:.12em}.katex .delimcenter,.katex .op-symbol{position:relative}.katex .op-symbol.small-op{font-family:KaTeX_Size1}.katex .op-symbol.large-op{font-family:KaTeX_Size2}.katex .accent>.vlist-t,.katex .op-limits>.vlist-t{text-align:center}.katex .accent .accent-body{position:relative}.katex .accent .accent-body:not(.accent-full){width:0}.katex .overlay{display:block}.katex .mtable .vertical-separator{display:inline-block;min-width:1px}.katex .mtable .arraycolsep{display:inline-block}.katex .mtable .col-align-c>.vlist-t{text-align:center}.katex .mtable .col-align-l>.vlist-t{text-align:left}.katex .mtable .col-align-r>.vlist-t{text-align:right}.katex .svg-align{text-align:left}.katex svg{fill:currentColor;stroke:currentColor;display:block;height:inherit;position:absolute;width:100%}.katex svg path{stroke:none}.katex svg{fill-rule:nonzero;fill-opacity:1;stroke-width:1;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1}.katex img{border-style:none;max-height:none;max-width:none;min-height:0;min-width:0}.katex .stretchy{display:block;overflow:hidden;position:relative;width:100%}.katex .stretchy:after,.katex .stretchy:before{content:""}.katex .hide-tail{overflow:hidden;position:relative;width:100%}.katex .halfarrow-left{left:0;overflow:hidden;position:absolute;width:50.2%}.katex .halfarrow-right{overflow:hidden;position:absolute;right:0;width:50.2%}.katex .brace-left{left:0;overflow:hidden;position:absolute;width:25.1%}.katex .brace-center{left:25%;overflow:hidden;position:absolute;width:50%}.katex .brace-right{overflow:hidden;position:absolute;right:0;width:25.1%}.katex .x-arrow-pad{padding:0 .5em}.katex .cd-arrow-pad{padding:0 .55556em 0 .27778em}.katex .mover,.katex .munder,.katex .x-arrow{text-align:center}.katex .boxpad{padding:0 .3em}.katex .fbox,.katex .fcolorbox{border:.04em solid;box-sizing:border-box}.katex .cancel-pad{padding:0 .2em}.katex .cancel-lap{margin-left:-.2em;margin-right:-.2em}.katex .sout{border-bottom-style:solid;border-bottom-width:.08em}.katex .angl{border-right:.049em solid;border-top:.049em solid;box-sizing:border-box;margin-right:.03889em}.katex .anglpad{padding:0 .03889em}.katex .eqn-num:before{content:"(" counter(katexEqnNo) ")";counter-increment:katexEqnNo}.katex .mml-eqn-num:before{content:"(" counter(mmlEqnNo) ")";counter-increment:mmlEqnNo}.katex .mtr-glue{width:50%}.katex .cd-vert-arrow{display:inline-block;position:relative}.katex .cd-label-left{display:inline-block;position:absolute;right:calc(50% + .3em);text-align:left}.katex .cd-label-right{display:inline-block;left:calc(50% + .3em);position:absolute;text-align:right}.katex-display{display:block;margin:1em 0;text-align:center}.katex-display>.katex{display:block;text-align:center;white-space:nowrap}.katex-display>.katex>.katex-html{display:block;position:relative}.katex-display>.katex>.katex-html>.tag{position:absolute;right:0}.katex-display.leqno>.katex>.katex-html>.tag{left:0;right:auto}.katex-display.fleqn>.katex{padding-left:2em;text-align:left}body{counter-reset:katexEqnNo mmlEqnNo}.notes-chapter{display:flex;flex-direction:column;gap:14px}.notes-chapter-title{position:relative;margin:0 0 4px;padding-left:14px;font-size:18px;font-weight:800;color:#1a1a1a}.notes-chapter-title:before{content:"";position:absolute;left:0;top:50%;transform:translateY(-50%);width:6px;height:6px;border-radius:50%;background:#e60012}.notes-methods-label{font-size:15px;font-weight:800;color:#1a1a1a}.md-section{display:flex;flex-direction:column;gap:20px}.limit-row{display:flex;align-items:flex-start;gap:24px}.limit-row-label{width:150px;flex-shrink:0;display:flex;flex-direction:column;gap:4px;padding-top:4px}.limit-row-label-main{font-size:17px;font-weight:800;color:#e60012}.limit-row-label-sub{font-size:14px;font-weight:700;color:#e60012}.limit-row-body{flex:1;min-width:0}.limit-card{background:#fff;border-radius:14px;padding:20px 22px;box-shadow:0 2px 10px #0000000a}.type-list{display:flex;flex-direction:column;gap:12px}.md{font-size:14px;line-height:1.7;color:#444}.md p{margin:0}.md p+p{margin-top:8px}.md ul{margin:0;padding:0;list-style:none;display:flex;flex-direction:column;gap:10px}.md ul li{position:relative;padding-left:14px}.md ul li:before{content:"";position:absolute;left:0;top:9px;width:6px;height:6px;border-radius:50%;background:#e60012}.md ol{margin:0;padding:0;list-style:none;counter-reset:md-step;display:flex;flex-direction:column;gap:12px}.md ol li{position:relative;padding-left:32px}.md ol li:before{counter-increment:md-step;content:counter(md-step);position:absolute;left:0;top:2px;width:22px;height:22px;display:flex;align-items:center;justify-content:center;background:#fef0f0;color:#e60012;border-radius:7px;font-size:12px;font-weight:700}.md blockquote{margin:12px 0 0;padding:10px 12px;border:1px dashed #e0e0e0;border-radius:8px;font-size:13px;color:#999;text-align:center}.md blockquote p{margin:0;font-size:13px;color:#999}.md .katex-display{margin:12px 0}.md-details{background:#fff;border-radius:12px;box-shadow:0 2px 10px #0000000a;overflow:hidden}.md-details summary{list-style:none;cursor:pointer;display:flex;align-items:center;gap:10px;padding:14px 18px;font-size:15px;font-weight:700;color:#1a1a1a;transition:background .15s;-webkit-user-select:none;user-select:none}.md-details summary::-webkit-details-marker{display:none}.md-details summary:before{content:"▸";flex-shrink:0;width:16px;font-size:13px;font-weight:700;color:#e60012}.md-details[open] summary:before{content:"▾"}.md-details summary:hover{background:#fafafa}.md-details>.md{padding:14px 18px 18px 44px;border-top:1px solid #f5f5f5}@media(max-width:768px){.limit-row{flex-direction:column;gap:12px}.limit-row-label{width:auto;flex-direction:row;align-items:baseline;gap:8px;padding-top:0}}.practice-list{display:flex;flex-direction:column;gap:24px}.practice-card{background:#fff;border-radius:16px;padding:32px;box-shadow:0 4px 24px #0000000f}.practice-head{margin-bottom:20px}.practice-title{margin:0 0 16px;font-size:18px;font-weight:800;color:#1a1a1a}.practice-question{padding:18px 22px;background:#fafafa;border-radius:12px;font-size:22px;font-weight:600;color:#1a1a1a;text-align:center}.practice-question sub,.practice-question sup{font-size:13px;font-weight:500}.practice-step-label{margin:0 0 12px;font-size:14px;font-weight:700;color:#666}.practice-options{display:flex;flex-wrap:wrap;gap:12px}.practice-option{padding:10px 22px;background:#fff;color:#333;border:1px solid #e5e5e5;border-radius:999px;font-size:14px;font-weight:600;cursor:pointer;transition:all .2s ease}.practice-option:hover:not(:disabled){border-color:#e60012;color:#e60012;background:#fef0f0}.practice-option:disabled{cursor:default}.practice-option.is-correct{border-color:#16a34a;color:#16a34a;background:#ecfdf3}.practice-option.is-wrong{border-color:#e60012;color:#e60012;background:#fef0f0}.practice-feedback{margin-top:20px;padding:18px 20px;border-radius:12px}.practice-feedback-correct{background:#ecfdf3}.practice-feedback-wrong{background:#fef0f0}.practice-feedback-line{margin:0;font-size:15px;font-weight:700}.practice-feedback-correct .practice-feedback-line{color:#16a34a}.practice-feedback-wrong .practice-feedback-line{color:#e60012}.practice-correct-answer{margin:6px 0 0;font-size:14px;color:#666}.practice-steps{list-style:none;margin:14px 0 0;padding:0;display:flex;flex-direction:column;gap:8px}.practice-steps li{position:relative;padding-left:28px;font-size:14px;line-height:1.6;color:#444}.practice-steps li:before{content:counter(step);counter-increment:step;position:absolute;left:0;top:0;display:flex;align-items:center;justify-content:center;width:20px;height:20px;background:#16a34a;color:#fff;border-radius:50%;font-size:12px;font-weight:700}.practice-steps{counter-reset:step}.practice-answer{margin-top:14px;font-size:18px;font-weight:800;color:#16a34a}.reading-container{max-width:960px;margin:0 auto;display:flex;flex-direction:column;gap:20px}.reading-header-title-row{display:flex;align-items:flex-start;justify-content:space-between;gap:16px}.reading-title{margin:0;font-size:32px;font-weight:800;color:#e60012;line-height:1.2}.reading-title-accent{display:block;width:40px;height:4px;margin-top:12px;background:#e60012;border-radius:2px}.reading-subtitle{margin:12px 0 0;font-size:14px;color:#999}.reading-generate-btn{flex-shrink:0;padding:10px 20px;border:none;border-radius:999px;background:#1a1a1a;color:#fff;font-size:14px;font-weight:600;cursor:pointer;transition:transform .2s,box-shadow .2s}.reading-generate-btn:hover{transform:scale(1.03);box-shadow:0 6px 16px #0000002e}.reading-intro .reading-generate-btn{margin-top:24px}.reading-filters{display:flex;gap:12px}.reading-select{min-width:140px;padding:9px 14px;border:1px solid #e0e0e0;border-radius:10px;background:#fff;color:#333;font-size:14px;font-family:inherit;cursor:pointer}.reading-select:focus{outline:none;border-color:#e60012}.reading-loading{padding:80px 0;text-align:center;color:#999;font-size:15px}.reading-error{margin:0;padding:12px 16px;background:#fde8ea;color:#e60012;border-radius:10px;font-size:13px}.reading-empty{display:flex;flex-direction:column;align-items:center;gap:10px;padding:64px 0;color:#bbb;font-size:14px}.reading-empty span{font-size:40px}.reading-empty p{margin:0}.reading-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}.reading-card{display:flex;flex-direction:column;gap:10px;text-align:left;padding:20px;background:#fff;border:none;border-radius:16px;box-shadow:0 2px 10px #0000000a;cursor:pointer;font-family:inherit;transition:transform .15s,box-shadow .15s}.reading-card:hover{transform:translateY(-2px);box-shadow:0 8px 24px #00000014}.reading-card-top{display:flex;align-items:center;gap:8px}.reading-card-tag{display:inline-block;padding:3px 10px;border-radius:999px;background:#e60012;color:#fff;font-size:12px;font-weight:600}.reading-card-read{display:inline-block;padding:3px 10px;border-radius:999px;background:#e8f7ee;color:#1a9c5c;font-size:12px;font-weight:600}.reading-card-title{margin:0;font-size:17px;font-weight:700;color:#1a1a1a;line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.reading-card-meta{display:flex;align-items:center;gap:12px;font-size:12px;color:#999}.reading-pagination{display:flex;align-items:center;justify-content:center;gap:16px}.reading-page-btn{padding:8px 18px;border:1px solid #e0e0e0;border-radius:999px;background:#fff;color:#333;font-size:13px;cursor:pointer;transition:all .15s}.reading-page-btn:hover:not(:disabled){border-color:#e60012;color:#e60012}.reading-page-btn:disabled{opacity:.4;cursor:not-allowed}.reading-page-info{font-size:13px;color:#666}.reading-modal-mask{position:fixed;top:0;right:0;bottom:0;left:0;background:#0006;display:flex;align-items:center;justify-content:center;z-index:1000}.reading-modal{width:360px;max-width:90vw;background:#fff;border-radius:16px;padding:24px;display:flex;flex-direction:column;gap:10px}.reading-modal h3{margin:0 0 6px;font-size:18px;font-weight:800;color:#1a1a1a}.reading-modal-label{margin-top:6px;font-size:13px;color:#666}.reading-modal .reading-select{width:100%}.reading-modal-actions{display:flex;justify-content:flex-end;gap:12px;margin-top:10px}.reading-modal-cancel,.reading-modal-confirm{padding:9px 20px;border-radius:999px;font-size:14px;cursor:pointer}.reading-modal-cancel{background:#fff;border:1px solid #e0e0e0;color:#666}.reading-modal-confirm{background:#e60012;border:none;color:#fff;font-weight:600}.reading-modal-confirm:hover:not(:disabled){background:#c5000f}.reading-modal-confirm:disabled{opacity:.6;cursor:not-allowed}.reading-detail-header{display:flex;flex-direction:column;gap:12px}.reading-detail-title{margin:0;font-size:28px;font-weight:800;color:#1a1a1a;line-height:1.4}.reading-detail-toolbar{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap}.reading-detail-meta{display:flex;align-items:center;flex-wrap:wrap;gap:12px}.reading-detail-meta-item{font-size:13px;color:#999}.reading-detail-actions{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.reading-font-group{display:flex;align-items:center;gap:4px}.reading-font-btn{width:34px;height:34px;display:inline-flex;align-items:center;justify-content:center;border:1px solid #e0e0e0;border-radius:10px;background:#fff;color:#333;font-size:13px;font-weight:700;cursor:pointer;transition:all .15s}.reading-font-btn:hover{border-color:#e60012;color:#e60012}.reading-btn-done{background:#f0f0f0;border-color:#f0f0f0;color:#999;cursor:default}.reading-detail-score{font-size:13px;color:#999;white-space:nowrap}.reading-article{align-self:center;width:100%;max-width:900px;background:#fff;border-radius:16px;padding:32px;box-shadow:0 2px 10px #0000000a}.reading-article-body{font-size:16px;line-height:1.8;color:#333}.reading-paragraph{margin:0 0 1em}.reading-paragraph:last-child{margin-bottom:0}.reading-detail-split{max-width:none}.reading-split{display:grid;grid-template-columns:1fr 1fr;gap:20px;height:calc(100vh - 240px);min-height:480px}.reading-split-left,.reading-split-right{min-height:0;background:#fff;border-radius:16px;box-shadow:0 2px 10px #0000000a}.reading-split-left{overflow-y:auto;padding:32px}.reading-split-left .reading-article-body{color:#333}.reading-split-right{display:flex;flex-direction:column;overflow:hidden}.reading-quiz-pane-head{flex-shrink:0;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:16px 20px;border-bottom:1px solid #f0f0f0}.reading-quiz-pane-title{font-size:16px;font-weight:800;color:#1a1a1a}.reading-quiz-exit{padding:7px 16px;border:1px solid #e0e0e0;border-radius:999px;background:#fff;color:#666;font-size:13px;cursor:pointer;transition:all .15s}.reading-quiz-exit:hover{border-color:#e60012;color:#e60012}.reading-quiz-pane-body{flex:1;min-height:0;overflow-y:auto;padding:20px;display:flex;flex-direction:column;gap:20px}.reading-long-sentence{background:#fff4c2;border-bottom:1px dashed #e0b400;cursor:pointer;position:relative;transition:background .15s}.reading-long-sentence:hover{background:#ffe98a}.reading-long-sentence:hover:after{content:"点击解析";position:absolute;left:0;bottom:calc(100% + 6px);padding:3px 8px;background:#1a1a1a;color:#fff;font-size:11px;line-height:1.4;border-radius:6px;white-space:nowrap;z-index:10}.reading-toolbar{position:fixed;transform:translate(-50%,-100%);display:flex;gap:6px;padding:4px;background:#1a1a1a;border-radius:999px;box-shadow:0 6px 20px #00000040;z-index:900}.reading-toolbar-btn{padding:6px 14px;border:none;border-radius:999px;background:transparent;color:#fff;font-size:13px;cursor:pointer;white-space:nowrap;transition:background .15s}.reading-toolbar-btn:hover{background:#ffffff2e}.reading-toolbar-btn-collect{color:#ffd54f}.reading-explain{position:fixed;width:300px;max-width:80vw;background:#fff;border-radius:12px;padding:16px;box-shadow:0 8px 30px #0000002e;z-index:950;display:flex;flex-direction:column;gap:10px}.reading-explain-loading,.reading-explain-error{width:auto;padding:12px 16px;font-size:13px}.reading-explain-loading{color:#666}.reading-explain-error{color:#e60012;background:#fde8ea}.reading-explain-close{position:absolute;top:6px;right:10px;border:none;background:none;color:#999;font-size:18px;line-height:1;cursor:pointer}.reading-explain-close:hover{color:#e60012}.reading-explain-section{display:flex;flex-direction:column;gap:4px}.reading-explain-label{font-size:12px;font-weight:700;color:#e60012}.reading-explain-text{font-size:14px;line-height:1.6;color:#333;word-break:break-word}.reading-sentence-card{position:fixed;width:340px;max-width:calc(100vw - 32px);background:#fff;border-radius:12px;box-shadow:0 12px 40px #00000038;z-index:960;-webkit-user-select:none;user-select:none;display:flex;flex-direction:column;overflow:hidden}.reading-sentence-card-bar{flex-shrink:0;display:flex;align-items:center;justify-content:space-between;gap:10px;padding:10px 14px;background:#1a1a1a;cursor:grab}.reading-sentence-card-bar:active{cursor:grabbing}.reading-sentence-card-bar-title{font-size:13px;font-weight:600;color:#fff}.reading-sentence-card-close{border:none;background:none;color:#bbb;font-size:18px;line-height:1;cursor:pointer;padding:0 2px}.reading-sentence-card-close:hover{color:#fff}.reading-sentence-card-body{padding:14px 16px;display:flex;flex-direction:column;gap:10px;max-height:60vh;overflow-y:auto;-webkit-user-select:text;user-select:text}.reading-sentence-card-sentence{margin:0;font-size:1em;line-height:1.6;color:#1a1a1a;font-weight:600;word-break:break-word}.reading-sentence-card-section{display:flex;flex-direction:column;gap:4px}.reading-sentence-card-label{font-size:12px;font-weight:700;color:#e60012}.reading-sentence-card-text{font-size:.94em;line-height:1.6;color:#444;word-break:break-word}.reading-quiz-empty{margin:0;font-size:14px;color:#999}.reading-quiz-item{display:flex;flex-direction:column;gap:12px;padding-bottom:20px;border-bottom:1px solid #f0f0f0}.reading-quiz-item:last-of-type{border-bottom:none;padding-bottom:0}.reading-quiz-question{margin:0;font-size:15px;font-weight:600;color:#1a1a1a;line-height:1.6}.reading-quiz-options{display:flex;flex-direction:column;gap:8px}.reading-quiz-option{display:flex;align-items:flex-start;gap:10px;text-align:left;padding:11px 14px;border:1px solid #eee;border-radius:10px;background:#fafafa;font-size:14px;color:#333;line-height:1.5;cursor:pointer;font-family:inherit;transition:all .15s}.reading-quiz-option:hover:not(:disabled){border-color:#e60012;background:#fef0f0}.reading-quiz-option-key{flex-shrink:0;width:20px;height:20px;display:inline-flex;align-items:center;justify-content:center;border-radius:50%;background:#fff;border:1px solid #ddd;font-size:12px;font-weight:700;color:#666}.reading-quiz-option-selected{border-color:#e60012;background:#fef0f0}.reading-quiz-option-selected .reading-quiz-option-key{background:#e60012;border-color:#e60012;color:#fff}.reading-quiz-option-correct{border-color:#1a9c5c;background:#e8f7ee}.reading-quiz-option-correct .reading-quiz-option-key{background:#1a9c5c;border-color:#1a9c5c;color:#fff}.reading-quiz-option-wrong{border-color:#e60012;background:#fde8ea}.reading-quiz-option-wrong .reading-quiz-option-key{background:#e60012;border-color:#e60012;color:#fff}.reading-quiz-option:disabled{cursor:default;opacity:1}.reading-quiz-explain{display:flex;flex-direction:column;gap:4px;padding:10px 14px;border-radius:10px;font-size:13px;line-height:1.6}.reading-quiz-explain.is-correct{background:#e8f7ee;color:#1a9c5c}.reading-quiz-explain.is-wrong{background:#fde8ea;color:#c5000f}.reading-quiz-explain-verdict{font-weight:700}.reading-quiz-explain-text{color:#555}.reading-submit-btn{align-self:center;padding:12px 40px;border:none;border-radius:999px;background:#1a1a1a;color:#fff;font-size:15px;font-weight:600;cursor:pointer;transition:transform .2s,box-shadow .2s}.reading-submit-btn:hover:not(:disabled){transform:scale(1.03);box-shadow:0 6px 16px #0000002e}.reading-submit-btn:disabled{opacity:.6;cursor:not-allowed}.reading-quiz-score{text-align:center;font-size:15px;color:#333}.reading-quiz-score strong{color:#e60012;font-size:22px}.reading-btn{padding:10px 20px;border:1px solid #e0e0e0;border-radius:999px;background:#fff;color:#333;font-size:14px;font-weight:600;cursor:pointer;transition:all .15s}.reading-btn:hover:not(:disabled){border-color:#e60012;color:#e60012}.reading-btn:disabled{opacity:.6;cursor:not-allowed}.reading-btn-primary{background:#e60012;border-color:#e60012;color:#fff}.reading-btn-primary:hover:not(:disabled){background:#c5000f;color:#fff}.reading-btn-primary:disabled{background:#f0f0f0;border-color:#f0f0f0;color:#999}.reading-toast{position:fixed;bottom:40px;left:50%;transform:translate(-50%);padding:10px 22px;background:#1a1a1a;color:#fff;font-size:14px;border-radius:999px;box-shadow:0 6px 20px #00000040;z-index:1100}@media(max-width:720px){.reading-grid{grid-template-columns:1fr}.reading-header-title-row{flex-direction:column}.reading-article{padding:20px}.reading-detail-toolbar{flex-direction:column;align-items:flex-start}.reading-split{grid-template-columns:1fr;height:auto;min-height:0}.reading-split-left,.reading-split-right{max-height:60vh}}.speaking-page{display:flex;flex-direction:column;height:100vh;overflow:hidden;background:#f5f5f5;padding-top:64px}.speaking-layout{width:100%;height:calc(100vh - 64px);padding:0 5%;background:#f5f5f5;display:flex;gap:0;box-sizing:border-box;min-height:0}.speaking-intro{flex:1;min-height:0;padding:40px;overflow-y:auto}.speaking-cards{display:flex;width:100%;height:100%;gap:0;background:#fff;border-radius:12px;box-shadow:0 2px 12px #0000000f;overflow:hidden}.speaking-col{display:flex;flex-direction:column;min-width:0;height:100%;background:#fff;overflow:hidden;border-right:2px solid #f0f0f0}.speaking-chat{flex:0 0 40%}.speaking-translation{flex:0 0 30%}.speaking-tools{flex:0 0 30%;border-right:none}.speaking-col-header{flex-shrink:0;padding:14px 20px;background:#f8f8f8;border-bottom:2px solid #e60012;font-size:16px;font-weight:700;color:#333}.speaking-chat-list,.speaking-translation-list,.speaking-tools-content{flex:1;overflow-y:auto;padding:16px 20px;background:#fff}.speaking-msg{display:flex;flex-direction:column;margin-bottom:12px}.speaking-msg-user{align-items:flex-end}.speaking-msg-assistant{align-items:flex-start}.speaking-msg-system{align-items:center}.speaking-msg-role{font-size:12px;color:#999;margin-bottom:4px}.speaking-bubble{max-width:80%;padding:10px 14px;border-radius:12px;font-size:14px;line-height:1.5;word-break:break-word;white-space:pre-wrap}.speaking-msg-user .speaking-bubble{background:#e60012;color:#fff}.speaking-msg-assistant .speaking-bubble{background:#fff;color:#333;border:1px solid #eee}.speaking-bubble-row{display:flex;align-items:flex-end;gap:6px;max-width:90%}.speaking-play-btn{flex-shrink:0;width:26px;height:26px;border-radius:50%;border:none;background:#f0f0f0;color:#666;font-size:13px;line-height:1;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .15s}.speaking-play-btn:hover,.speaking-play-btn-active{background:#e60012;color:#fff}.speaking-msg-system .speaking-bubble{background:#f5f5f5;color:#999;font-size:13px}.speaking-chat-input{flex-shrink:0;display:flex;flex-direction:column;gap:8px;padding:16px 20px;background:#fff;border-top:1px solid #eee}.speaking-textarea{width:100%;height:80px;margin:0;padding:10px 12px;border:1px solid #d1d5db;border-radius:8px;font-size:14px;font-family:inherit;resize:none;box-sizing:border-box}.speaking-textarea:focus{outline:none;border-color:#e60012}.speaking-send-btn{align-self:flex-end;background:#1a1a1a;color:#fff;border:none;border-radius:999px;padding:10px 28px;font-size:14px;cursor:pointer;transition:transform .2s,box-shadow .2s}.speaking-send-btn:hover:not(:disabled){transform:scale(1.03);box-shadow:0 4px 12px #0000002e}.speaking-send-btn:disabled{opacity:.6;cursor:not-allowed}.speaking-error{margin:0;font-size:13px;color:#e60012}.speaking-input-actions{align-self:flex-end;display:flex;align-items:center;gap:8px}.speaking-input-actions .speaking-send-btn{align-self:center}.speaking-recording-hint{font-size:12px;color:#e60012}.speaking-mic-btn{flex-shrink:0;width:40px;height:40px;border-radius:50%;border:none;background:#f0f0f0;color:#666;font-size:18px;line-height:1;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background .15s,color .15s}.speaking-mic-btn:hover:not(:disabled){background:#e60012;color:#fff}.speaking-mic-btn:disabled{opacity:.4;cursor:not-allowed}.speaking-mic-btn-recording{background:#e60012;color:#fff;animation:speaking-mic-pulse 1.2s ease-in-out infinite}@keyframes speaking-mic-pulse{0%,to{box-shadow:0 0 #e6001266}50%{box-shadow:0 0 0 10px #e6001200}}.speaking-mic-spinner{width:16px;height:16px;border:2px solid rgba(0,0,0,.15);border-top-color:#666;border-radius:50%;animation:speaking-mic-spin .8s linear infinite}@keyframes speaking-mic-spin{to{transform:rotate(360deg)}}.speaking-history{flex-shrink:0;border-bottom:1px solid #eee}.speaking-history-bar{display:flex;align-items:center;justify-content:space-between;padding:10px 16px}.speaking-new-btn{background:#e60012;color:#fff;border:none;border-radius:999px;padding:6px 16px;font-size:13px;cursor:pointer;transition:background .2s}.speaking-new-btn:hover{background:#c5000f}.speaking-history-toggle{background:none;border:none;color:#666;font-size:13px;font-weight:600;cursor:pointer;padding:6px 0}.speaking-history-toggle:hover{color:#e60012}.speaking-history-list{max-height:240px;overflow-y:auto;border-top:1px solid #f0f0f0;padding:4px 0}.speaking-history-item{display:flex;align-items:center;justify-content:space-between;padding:8px 16px;cursor:pointer;border-left:3px solid transparent;transition:background .15s}.speaking-history-item:hover{background:#fafafa}.speaking-history-item-active{background:#fef0f0;border-left-color:#e60012}.speaking-history-item-active:hover{background:#fef0f0}.speaking-history-info{display:flex;flex-direction:column;min-width:0;flex:1}.speaking-history-title{font-size:13px;color:#333;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.speaking-history-time{font-size:11px;color:#999;margin-top:2px}.speaking-history-delete{opacity:0;border:none;background:none;color:#e60012;font-size:12px;cursor:pointer;padding:2px 4px;flex-shrink:0;transition:opacity .15s}.speaking-history-item:hover .speaking-history-delete{opacity:1}.speaking-history-delete:hover{text-decoration:underline}.speaking-history-empty{padding:12px 16px;margin:0;font-size:12px;color:#999}.speaking-trans-msg{display:flex;flex-direction:column;margin-bottom:12px}.speaking-trans-user{align-items:flex-end}.speaking-trans-assistant{align-items:flex-start}.speaking-trans-bubble{max-width:80%;padding:10px 14px;border-radius:12px;font-size:14px;line-height:1.5;word-break:break-word;white-space:pre-wrap}.speaking-trans-user .speaking-trans-bubble{background:#f5f5f5;color:#333}.speaking-trans-assistant .speaking-trans-bubble{background:#fff;color:#333;border:1px solid #eee}.speaking-tool-block{margin-bottom:20px;padding-bottom:20px;border-bottom:1px solid #f0f0f0}.speaking-tool-block:last-child{margin-bottom:0;padding-bottom:0;border-bottom:none}.speaking-tool-label{margin:0 0 10px;font-size:14px;font-weight:700;color:#666}.speaking-tool-buttons{display:flex;flex-wrap:wrap;gap:8px}.speaking-tool-btn{padding:8px 16px;border:1px solid #e60012;border-radius:999px;background:#fff;color:#666;font-size:13px;cursor:pointer;transition:all .2s}.speaking-tool-btn:hover{background:#fef0f0}.speaking-tool-btn-active{background:#e60012;color:#fff}.speaking-tool-btn-active:hover{background:#e60012}.speaking-topic-scroll{max-height:132px;overflow-y:auto;padding-right:4px}.speaking-topic-scroll::-webkit-scrollbar{width:6px}.speaking-topic-scroll::-webkit-scrollbar-thumb{background:#ddd;border-radius:3px}.speaking-topic-scroll::-webkit-scrollbar-thumb:hover{background:#bbb}.speaking-topic-collapse{background:#fff;border:none;border-radius:0}.speaking-topic-collapse .ant-collapse-item{border-bottom:1px solid #f0f0f0}.speaking-topic-collapse .ant-collapse-item:last-child{border-bottom:none}.speaking-topic-collapse .ant-collapse-header{padding:8px 0!important;font-size:13px;font-weight:600;color:#333}.speaking-topic-collapse .ant-collapse-header .ant-collapse-expand-icon,.speaking-topic-collapse .ant-collapse-header .ant-collapse-arrow{color:#e60012}.speaking-topic-collapse .ant-collapse-content-box{padding:4px 0 12px!important}.speaking-topic-tags{display:flex;flex-wrap:wrap;gap:8px}.speaking-topic-tag{padding:5px 12px;border:1px solid #e60012;border-radius:999px;background:#fff;color:#666;font-size:12px;line-height:1.4;cursor:pointer;transition:all .2s}.speaking-topic-tag:hover{background:#fef0f0}.speaking-topic-tag-active,.speaking-topic-tag-active:hover{background:#e60012;color:#fff}.speaking-autoplay-row{display:flex;align-items:center;justify-content:space-between}.speaking-autoplay-label{font-size:13px;color:#666}.speaking-toggle{position:relative;width:44px;height:24px;border-radius:999px;border:none;background:#d1d5db;cursor:pointer;padding:0;flex-shrink:0;transition:background .2s}.speaking-toggle-on{background:#e60012}.speaking-toggle-knob{position:absolute;top:2px;left:2px;width:20px;height:20px;border-radius:50%;background:#fff;transition:transform .2s}.speaking-toggle-on .speaking-toggle-knob{transform:translate(20px)}.speaking-rate-row{display:flex;align-items:center;justify-content:space-between;margin-top:12px}.speaking-rate-label{font-size:13px;color:#666}.speaking-rate-buttons{display:flex;gap:6px}.speaking-rate-btn{padding:5px 10px;border:1px solid #e60012;border-radius:999px;background:#fff;color:#666;font-size:12px;cursor:pointer;transition:all .2s}.speaking-rate-btn:hover{background:#fef0f0}.speaking-rate-btn-active{background:#e60012;color:#fff}.speaking-rate-btn-active:hover{background:#e60012}.speaking-suggestion{display:block;width:100%;margin-bottom:8px;padding:10px 12px;border:1px solid #eee;border-radius:8px;background:#fafafa;text-align:left;cursor:pointer;transition:all .2s}.speaking-suggestion:hover{border-color:#e60012;background:#fef0f0}.speaking-suggestion-en{display:block;font-size:14px;color:#333}.speaking-suggestion-zh{display:block;margin-top:2px;font-size:12px;color:#999}.speaking-suggestion-empty,.speaking-score-placeholder{margin:0;font-size:13px;color:#999}.speaking-score-card{background:#fff;border:1px solid #eee;border-radius:16px;padding:16px}.speaking-score-total{display:flex;align-items:baseline;justify-content:center;margin-bottom:14px}.speaking-score-total-number{font-size:48px;font-weight:800;line-height:1}.speaking-score-total-unit{margin-left:4px;font-size:14px;color:#666}.speaking-score-items{display:flex;flex-direction:column;gap:12px;margin-bottom:14px}.speaking-score-bar-item{display:flex;flex-direction:column;gap:4px}.speaking-score-bar-head{display:flex;align-items:center;justify-content:space-between}.speaking-score-bar-label{font-size:13px;color:#666}.speaking-score-bar-value{font-size:13px;font-weight:700;color:#333}.speaking-score-bar-track{height:8px;border-radius:999px;background:#f0f0f0;overflow:hidden}.speaking-score-bar-fill{height:100%;border-radius:999px;background:#e60012;transition:width .4s ease}.speaking-score-errors{display:flex;flex-direction:column;gap:10px;margin-bottom:14px}.speaking-score-error-item{padding:10px 12px;border-radius:8px;background:#fafafa}.speaking-score-error-type{display:inline-block;padding:2px 8px;border-radius:4px;background:#e60012;color:#fff;font-size:11px;margin-bottom:6px}.speaking-score-error-line{display:flex;flex-wrap:wrap;align-items:baseline;gap:4px;font-size:13px}.speaking-score-error-original{color:#999;text-decoration:line-through}.speaking-score-error-arrow{color:#999}.speaking-score-error-fix{color:#16a34a;font-weight:600}.speaking-score-error-issue{margin:6px 0 0;font-size:12px;color:#666;line-height:1.5}.speaking-score-suggestion{padding:10px 12px;border-radius:8px;background:#f5f5f5;font-size:13px;color:#333;line-height:1.6}.speaking-chat-list::-webkit-scrollbar,.speaking-translation-list::-webkit-scrollbar,.speaking-tools-content::-webkit-scrollbar{width:6px}.speaking-chat-list::-webkit-scrollbar-thumb,.speaking-translation-list::-webkit-scrollbar-thumb,.speaking-tools-content::-webkit-scrollbar-thumb{background:#ddd;border-radius:3px}.speaking-chat-list::-webkit-scrollbar-thumb:hover,.speaking-translation-list::-webkit-scrollbar-thumb:hover,.speaking-tools-content::-webkit-scrollbar-thumb:hover{background:#bbb}@media(max-width:900px){.speaking-page{height:auto;min-height:100vh;overflow:visible}.speaking-layout{height:auto;padding:0;overflow-y:auto}.speaking-cards{flex-direction:column;height:auto;overflow:visible;border-radius:0}.speaking-chat,.speaking-translation,.speaking-tools{flex:none;height:auto;border-right:none;border-bottom:2px solid #f0f0f0}.speaking-tools{border-bottom:none}.speaking-chat-list,.speaking-translation-list{max-height:50vh}}.week-plan{display:flex;flex-direction:column;gap:10px}.week-plan-day{display:flex;align-items:flex-start;gap:16px;padding:12px 16px;border:1px solid #eee;border-left:3px solid #eee;border-radius:8px;background:#fff}.week-plan-day-today{border-left-color:#e60012;background:snow}.week-plan-day-head{flex-shrink:0;width:92px;display:flex;flex-direction:column;gap:2px}.week-plan-day-date{font-size:13px;font-weight:700;color:#333}.week-plan-day-week{font-size:12px;color:#999}.week-plan-day-today .week-plan-day-week{color:#e60012;font-weight:600}.week-plan-day-tasks{flex:1;display:flex;flex-direction:column;gap:6px;min-width:0}.week-plan-task{display:flex;align-items:center;gap:8px;font-size:13px;color:#333;cursor:pointer;word-break:break-word}.week-plan-task-title-done{color:#bbb;text-decoration:line-through}.week-plan-error{margin:0;font-size:13px;color:#e60012}.stats-container{max-width:960px;margin:0 auto;display:flex;flex-direction:column;gap:20px}.stats-header{margin-bottom:4px}.stats-title{margin:0;font-size:32px;font-weight:800;color:#e60012;line-height:1.2}.stats-title-accent{display:block;width:40px;height:4px;margin-top:12px;background:#e60012;border-radius:2px}.stats-subtitle{margin:12px 0 0;font-size:14px;color:#999}.stats-loading{padding:80px 0;text-align:center;color:#999;font-size:15px}.stats-error{margin:0;padding:12px 16px;background:#fde8ea;color:#e60012;border-radius:10px;font-size:13px}.stats-overview{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:16px}.stats-overview-card{background:#fff;border-radius:16px;padding:22px 18px;display:flex;flex-direction:column;align-items:center;gap:6px;box-shadow:0 2px 10px #0000000a}.stats-overview-icon{font-size:26px;line-height:1}.stats-overview-value{font-size:26px;font-weight:800;color:#e60012;line-height:1.1}.stats-overview-label{font-size:13px;color:#888;text-align:center}.stats-section{background:#fff;border-radius:16px;padding:24px;box-shadow:0 2px 10px #0000000a}.stats-section-title-row{display:flex;align-items:center;justify-content:space-between;gap:12px}.stats-section-title{margin:0 0 18px;font-size:17px;font-weight:800;color:#1a1a1a}.stats-section-title-row .stats-section-title{margin-bottom:0}.stats-words-row,.stats-speaking-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.stats-words-cell{background:#fafafa;border-radius:12px;padding:16px;display:flex;flex-direction:column;gap:4px}.stats-words-cell-wide{grid-column:span 1}.stats-words-value{font-size:18px;font-weight:700;color:#1a1a1a;word-break:break-all}.stats-words-label{font-size:12px;color:#999}.stats-recognition{margin-top:18px}.stats-recognition-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:8px}.stats-recognition-label{font-size:13px;color:#666}.stats-recognition-value{font-size:14px;font-weight:700;color:#e60012}.stats-recognition-track{height:10px;background:#f0f0f0;border-radius:999px;overflow:hidden}.stats-recognition-fill{height:100%;background:#e60012;border-radius:999px;transition:width .4s ease}.stats-weak,.stats-topics{margin-top:18px}.stats-weak-head{font-size:13px;font-weight:700;color:#666;margin-bottom:10px}.stats-weak-empty{margin:0;font-size:13px;color:#bbb}.stats-weak-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:8px}.stats-weak-item{display:flex;align-items:center;gap:12px;padding:12px 14px;background:#fafafa;border-radius:10px;cursor:pointer;transition:background .15s}.stats-weak-item:hover{background:#fde8ea}.stats-weak-word{flex:1;min-width:0;font-size:15px;font-weight:700;color:#1a1a1a}.stats-weak-forget{font-size:12px;color:#e60012;white-space:nowrap}.stats-weak-strength{font-size:12px;color:#999;white-space:nowrap}.stats-topic-list{display:flex;flex-direction:column;gap:12px}.stats-topic-row{display:flex;align-items:center;gap:12px}.stats-topic-name{width:72px;flex-shrink:0;font-size:13px;color:#444}.stats-topic-track{flex:1;height:10px;background:#f0f0f0;border-radius:999px;overflow:hidden}.stats-topic-fill{height:100%;background:#4f8cff;border-radius:999px;transition:width .4s ease}.stats-topic-count{width:48px;flex-shrink:0;text-align:right;font-size:12px;color:#888}.stats-chart-legend{display:flex;gap:18px;margin-bottom:14px}.stats-chart-legend-item{display:inline-flex;align-items:center;gap:6px;font-size:12px;color:#666}.stats-chart-dot{width:10px;height:10px;border-radius:3px;display:inline-block}.stats-chart{display:flex;align-items:stretch;gap:14px}.stats-chart-col{flex:1;display:flex;flex-direction:column;align-items:center;gap:8px}.stats-chart-stack{position:relative;width:100%;max-width:56px;height:180px;display:flex;flex-direction:column;justify-content:flex-end;background:#f5f5f5;border-radius:8px;overflow:hidden}.stats-chart-seg{width:100%;transition:height .4s ease}.stats-chart-seg:first-child{border-radius:0 0 8px 8px}.stats-chart-zero{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;align-items:center;justify-content:center;font-size:12px;color:#ccc}.stats-chart-day{font-size:11px;color:#999}.stats-ai-reanalyze{flex-shrink:0;padding:7px 16px;border:none;border-radius:999px;background:#e60012;color:#fff;font-size:13px;font-weight:600;cursor:pointer;transition:background .2s}.stats-ai-reanalyze:hover:not(:disabled){background:#c5000f}.stats-ai-reanalyze:disabled{opacity:.6;cursor:not-allowed}.stats-ai-reply{margin-top:14px;background:#fafafa;border-radius:12px;padding:18px}.stats-ai-loading{margin:0;font-size:14px;color:#999}.stats-ai-content{font-size:14px;line-height:1.7;color:#333;white-space:pre-wrap;word-break:break-word}.stats-ai-content strong{color:#e60012;font-weight:700}@media(max-width:720px){.stats-overview{grid-template-columns:repeat(2,1fr)}.stats-words-row,.stats-speaking-grid{grid-template-columns:1fr}.stats-chart{gap:8px}}.tasks-page{max-width:1080px;margin:0 auto}.tasks-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px}.tasks-title{margin:0;font-size:26px;font-weight:800;color:#1a1a1a}.tasks-error{margin:0 0 12px;font-size:13px;color:#e60012}.tasks-header-actions{display:flex;align-items:center;gap:12px}.tasks-refresh-btn{border:1px solid #e60012;background:#fff;color:#e60012;font-size:14px;font-weight:600;padding:6px 14px;border-radius:8px;cursor:pointer;white-space:nowrap;transition:background .2s,color .2s}.tasks-refresh-btn:hover:not(:disabled){background:#e60012;color:#fff}.tasks-refresh-btn:disabled{opacity:.6;cursor:not-allowed}.tasks-week{display:grid;grid-template-columns:repeat(7,1fr);gap:10px;margin-bottom:24px}.tasks-day-card{position:relative;display:flex;flex-direction:column;align-items:center;gap:4px;padding:14px 6px;border:1px solid #e5e5e5;border-radius:10px;background:#fff;cursor:pointer;font-family:inherit;transition:border-color .2s,background .2s}.tasks-day-card:hover{border-color:#e60012}.tasks-day-card-today{border:2px solid #e60012}.tasks-day-card-selected{background:#fef0f0}.tasks-day-num{font-size:22px;font-weight:800;color:#1a1a1a;line-height:1}.tasks-day-week{font-size:12px;color:#999}.tasks-day-count{font-size:11px;color:#bbb}.tasks-day-mark{font-size:14px;color:#e60012;height:16px;line-height:16px}.tasks-day-mark-done{color:#16a34a}.tasks-calendar{max-width:600px;margin:0 auto 24px;background:#fff;border-radius:12px;padding:12px 16px;box-shadow:0 2px 12px #0000000d}.tasks-cal-cell{display:flex;flex-direction:column;align-items:center}.tasks-cal-dot{width:6px;height:6px;border-radius:50%;background:#e60012;margin-top:2px}.tasks-cal-check{font-size:11px;color:#16a34a;margin-top:2px}.tasks-detail{background:#fff;border-radius:12px;padding:20px;box-shadow:0 2px 12px #0000000d}.tasks-detail-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:8px}.tasks-detail-title{margin:0;font-size:16px;font-weight:700;color:#1a1a1a}.tasks-detail-progress{width:130px;margin:0}.tasks-detail-empty{margin:20px 0 0;text-align:center;font-size:14px;color:#999}.tasks-detail-list .ant-list-item{padding:10px 0;border-bottom:1px solid #f5f5f5}.tasks-detail-list .ant-list-item:last-child{border-bottom:none}.tasks-detail-text{color:#333}.tasks-detail-text-done{color:#bbb;text-decoration:line-through}.tasks-detail-done{margin-top:12px;text-align:center;font-size:14px;font-weight:600;color:#16a34a}@media(max-width:900px){.tasks-week{grid-template-columns:repeat(4,1fr)}}.words-page{height:100vh;overflow:hidden;display:flex;flex-direction:column;background:#f5f6f8;padding-top:64px}.words-body{flex:1;display:flex;min-height:0}.words-sidenav{width:200px;flex-shrink:0;background:#fff;border-right:1px solid #ececec;display:flex;flex-direction:column;padding:24px 0 16px}.words-sidenav-title{padding:0 24px 20px;font-size:18px;font-weight:800;color:#1a1a1a}.words-sidenav-menu{display:flex;flex-direction:column}.words-sidenav-item{position:relative;display:block;width:100%;padding:14px 24px;text-align:left;background:transparent;border:none;font-size:15px;color:#333;cursor:pointer;transition:background .2s ease,color .2s ease}.words-sidenav-item:hover{background:#fafafa}.words-sidenav-item.is-active{background:#fef0f0;color:#e60012;font-weight:600}.words-sidenav-item.is-active:before{content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background:#e60012}.words-content{flex:1;background:#f5f6f8;padding:32px;overflow-y:auto;box-sizing:border-box}.words-container{max-width:860px;margin:0 auto;background:#fff;border-radius:16px;box-shadow:0 2px 12px #0000000d;padding:32px;box-sizing:border-box;min-height:480px}.words-intro{flex:1;min-height:0;padding:40px;overflow-y:auto}.review-loading{text-align:center;color:#999;font-size:15px;padding:60px 0}.review-error{margin:12px 0 0;font-size:13px;color:#e60012;text-align:center}.review-card{display:flex;flex-direction:column}.review-top{margin-bottom:24px}.review-remaining{display:block;margin-bottom:8px;font-size:13px;color:#999}.review-progress-track{height:4px;background:#eee;border-radius:999px;overflow:hidden}.review-progress-fill{height:100%;background:#e60012;border-radius:999px;transition:width .3s ease}.review-word-row{text-align:center;margin-bottom:28px}.review-word{margin:0 0 8px;font-size:48px;font-weight:800;color:#e60012;line-height:1.2;word-break:break-word}.review-meta{display:flex;align-items:center;justify-content:center;gap:12px}.review-accent{font-size:14px;color:#666;background:#f0f0f0;border-radius:999px;padding:2px 8px;line-height:1.4}.review-phonetic{font-size:16px;color:#666}.review-speak{width:36px;height:36px;border-radius:50%;border:none;background:#fde8ea;color:#e60012;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;transition:background .2s ease}.review-speak:hover{background:#fbd6da}.review-source{margin-top:10px;display:inline-block;font-size:12px;color:#888;background:#f6f6f6;border-radius:999px;padding:3px 12px}.review-body{cursor:pointer;min-height:320px}.review-recall{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;min-height:320px}.review-recall-hint{margin:0;font-size:16px;color:#999}.review-recall-sub{margin:0;font-size:13px;color:#bbb}.review-answer{display:flex;flex-direction:column;min-height:320px;cursor:default}.review-definitions{margin-bottom:16px}.review-definition{display:flex;align-items:baseline;gap:10px;margin-bottom:10px;font-size:16px}.review-pos{flex-shrink:0;color:#999;font-size:14px}.review-meaning{color:#333}.review-loading-inline{margin:0;color:#999;font-size:14px}.review-examples{margin-bottom:20px}.review-examples-title{margin:0 0 8px;font-size:14px;font-weight:700;color:#333}.review-example{margin-bottom:14px}.review-example-en{margin:0 0 4px;font-size:15px;color:#333;line-height:1.6}.review-example-zh{margin:0;font-size:13px;color:#999}.review-hl{color:#e60012;font-weight:700}.review-feedback{display:flex;gap:12px;margin-top:auto;padding-top:12px}.review-fb{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;padding:14px 0;border-radius:12px;background:#fff;border:1px solid;cursor:pointer;transition:all .2s ease}.review-fb:disabled{opacity:.6;cursor:not-allowed}.review-fb-label{display:inline-flex;align-items:center;gap:6px;font-size:16px;font-weight:700}.review-fb-preview{font-size:12px}.review-fb kbd{background:#00000014;border-radius:4px;padding:1px 6px;font-size:12px;font-weight:700;font-family:inherit}.review-fb-forgotten{border-color:#e60012;color:#e60012}.review-fb-forgotten:hover:not(:disabled){background:#fef0f0}.review-fb-vague{border-color:#f5a623;color:#f5a623}.review-fb-vague:hover:not(:disabled){background:#fff7ec}.review-fb-known{border-color:#22a06b;color:#22a06b}.review-fb-known:hover:not(:disabled){background:#eefaf3}.review-result{margin-top:auto;padding:14px 16px;border-radius:12px;background:#f0fdf4;border:1px solid #bbf7d0;color:#16a34a;font-size:15px;font-weight:600;text-align:center}.review-done,.review-empty{text-align:center;padding:48px 20px}.review-done-icon,.review-empty-icon{font-size:48px;margin-bottom:16px}.review-done-title{margin:0 0 8px;font-size:22px;font-weight:800;color:#1a1a1a}.review-done-summary{margin:0 0 16px;font-size:15px;color:#666}.review-done-counts{display:flex;justify-content:center;gap:20px;margin-bottom:24px;font-size:15px;font-weight:600}.review-done-known{color:#22a06b}.review-done-vague{color:#f5a623}.review-done-forgotten{color:#e60012}.review-done-actions{display:flex;justify-content:center;gap:12px}.review-done-btn{padding:12px 32px;border:none;border-radius:999px;background:#e60012;color:#fff;font-size:15px;font-weight:600;cursor:pointer;transition:background .2s ease}.review-done-btn:hover{background:#c5000f}.review-done-btn.ghost{background:#fff;color:#e60012;border:1px solid #e60012}.review-done-btn.ghost:hover{background:#fef0f0}.review-empty-text{margin:0 0 16px;font-size:18px;font-weight:700;color:#1a1a1a}.select-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-bottom:20px}.select-stat{background:#f8f8f8;border-radius:12px;padding:16px 8px;text-align:center;display:flex;flex-direction:column;gap:4px}.select-stat-value{font-size:24px;font-weight:800;color:#1a1a1a;line-height:1}.select-stat-label{font-size:12px;color:#999}.select-goal-value{border:none;background:transparent;font-size:24px;font-weight:800;color:#e60012;cursor:pointer;line-height:1}.select-goal-value:hover{text-decoration:underline}.select-goal-input{width:60px;font-size:22px;font-weight:800;text-align:center;border:1px solid #e60012;border-radius:8px;color:#e60012;outline:none}.select-search{margin-bottom:16px}.select-search input{width:100%;box-sizing:border-box;padding:10px 14px;border:1px solid #eee;border-radius:10px;font-size:14px;outline:none;transition:border-color .2s ease}.select-search input:focus{border-color:#e60012}.select-books{display:flex;flex-direction:column;gap:14px}.select-book{border:1px solid #eee;border-radius:14px;padding:20px;cursor:pointer;transition:all .2s ease}.select-book:hover{box-shadow:0 4px 14px #0000000f}.select-book.is-current{border-color:#e60012;box-shadow:0 0 0 1px #e60012}.select-book-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px}.select-book-name{font-size:17px;font-weight:700;color:#1a1a1a}.select-book-state{font-size:13px;color:#999}.select-book.is-current .select-book-state{color:#e60012;font-weight:600}.select-book-progress{margin-bottom:14px}.select-book-progress-track{height:6px;background:#eee;border-radius:999px;overflow:hidden}.select-book-progress-fill{height:100%;background:#e60012;border-radius:999px;transition:width .4s ease}.select-book-stats{display:flex;gap:16px;margin-bottom:8px;font-size:13px}.s-familiar{color:#22a06b}.s-medium{color:#f5a623}.s-weak{color:#e60012}.s-unlearned{color:#999}.select-book-count{font-size:12px;color:#999}.select-mine-count{font-size:13px;color:#666;margin-bottom:10px}.select-mine-empty{margin:8px 0 0;font-size:14px;color:#999}.select-mine-list{list-style:none;margin:0;padding:0;max-height:240px;overflow-y:auto;display:flex;flex-direction:column;gap:8px}.select-mine-item{display:flex;flex-direction:column;gap:2px;padding:8px 12px;background:#fafafa;border-radius:10px}.select-mine-word{font-size:15px;font-weight:600;color:#1a1a1a}.select-mine-source{font-size:12px;color:#999}.stats-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:12px;margin-bottom:24px}.stats-card{background:#f8f8f8;border-radius:12px;padding:18px 10px;text-align:center;display:flex;flex-direction:column;gap:6px}.stats-value{font-size:28px;font-weight:800;color:#1a1a1a;line-height:1}.stats-label{font-size:12px;color:#999}.stats-block{margin-bottom:20px}.stats-block-title{margin:0 0 12px;font-size:15px;font-weight:700;color:#1a1a1a}.stats-bar-row{display:flex;align-items:center;gap:12px;margin-bottom:12px}.stats-bar-label{width:60px;flex-shrink:0;font-size:13px;color:#666}.stats-bar-track{flex:1;height:10px;background:#eee;border-radius:999px;overflow:hidden}.stats-bar-fill{height:100%;border-radius:999px;transition:width .4s ease}.stats-bar-fill.known{background:#22a06b}.stats-bar-fill.vague{background:#f5a623}.stats-bar-fill.forgotten{background:#e60012}.stats-bar-value{width:60px;flex-shrink:0;text-align:right;font-size:13px;font-weight:600;color:#333}@media(max-width:768px){.words-sidenav{width:150px}.words-content{padding:16px}.words-container{padding:20px}.stats-grid,.select-stats{grid-template-columns:repeat(2,1fr)}.review-word{font-size:36px}}.writing-intro{flex:1;min-height:0;padding:40px;overflow-y:auto}.writing-layout{width:100%;height:calc(100vh - 64px);padding:0 5%;background:#f5f5f5;display:flex;gap:0;box-sizing:border-box;min-height:0}.writing-cards{display:flex;width:100%;height:100%;gap:0;background:#fff;border-radius:12px;box-shadow:0 2px 12px #0000000f;overflow:hidden}.writing-col{display:flex;flex-direction:column;min-width:0;height:100%;background:#fff;overflow:hidden;border-right:2px solid #f0f0f0}.writing-write{flex:0 0 40%}.writing-feedback{flex:0 0 30%}.writing-tools{flex:0 0 30%;border-right:none}.writing-col-header{flex-shrink:0;padding:14px 20px;background:#f8f8f8;border-bottom:2px solid #e60012;font-size:16px;font-weight:700;color:#333}.writing-feedback-body,.writing-tools-content{flex:1;overflow-y:auto;padding:16px 20px;background:#fff}.writing-write-body{flex:1;display:flex;flex-direction:column;padding:16px 20px;background:#fff;overflow-y:auto;box-sizing:border-box}.writing-topic{display:flex;align-items:center;gap:10px;margin-bottom:12px;flex-shrink:0}.writing-topic-label{flex-shrink:0;font-size:13px;font-weight:700;color:#666}.writing-topic-input{flex:1;min-width:0;padding:8px 12px;border:1px solid #d1d5db;border-radius:8px;font-size:14px;font-family:inherit;outline:none;box-sizing:border-box}.writing-topic-input:focus{border-color:#e60012}.writing-textarea{flex:1;min-height:400px;width:100%;margin:0;padding:12px 14px;border:1px solid #d1d5db;border-radius:10px;font-size:15px;font-family:inherit;line-height:1.6;resize:none;box-sizing:border-box}.writing-textarea:focus{outline:none;border-color:#e60012}.writing-write-footer{flex-shrink:0;display:flex;align-items:center;gap:12px;margin-top:12px}.writing-word-count{flex-shrink:0;font-size:13px;color:#999}.writing-error{flex:1;margin:0;font-size:13px;color:#e60012}.writing-submit-btn{flex-shrink:0;background:#e60012;color:#fff;border:none;border-radius:999px;padding:10px 28px;font-size:14px;font-weight:600;cursor:pointer;transition:transform .2s,box-shadow .2s}.writing-submit-btn:hover:not(:disabled){transform:scale(1.03);box-shadow:0 4px 12px #e6001247}.writing-submit-btn:disabled{opacity:.6;cursor:not-allowed}.writing-feedback-placeholder{margin:0;padding:40px 0;text-align:center;font-size:14px;color:#999}.writing-score-total{display:flex;align-items:baseline;justify-content:center;margin-bottom:14px}.writing-score-total-number{font-size:48px;font-weight:800;line-height:1}.writing-score-total-unit{margin-left:4px;font-size:14px;color:#666}.writing-score-items{display:flex;flex-direction:column;gap:12px;margin-bottom:14px}.writing-score-bar-item{display:flex;flex-direction:column;gap:4px}.writing-score-bar-head{display:flex;align-items:center;justify-content:space-between}.writing-score-bar-label{font-size:13px;color:#666}.writing-score-bar-value{font-size:13px;font-weight:700;color:#333}.writing-score-bar-track{height:8px;border-radius:999px;background:#f0f0f0;overflow:hidden}.writing-score-bar-fill{height:100%;border-radius:999px;background:#e60012;transition:width .4s ease}.writing-errors{margin-bottom:14px}.writing-errors-title{margin:0 0 8px;font-size:14px;font-weight:700;color:#333}.writing-error-item{padding:10px 12px;margin-bottom:8px;border-radius:8px;background:#fafafa}.writing-error-line{display:flex;flex-wrap:wrap;align-items:baseline;gap:4px;font-size:13px}.writing-error-original{color:#e60012;text-decoration:line-through}.writing-error-arrow{color:#999}.writing-error-fix{color:#16a34a;font-weight:600}.writing-error-issue{margin:6px 0 0;font-size:12px;color:#666;line-height:1.5}.writing-suggestions{margin-bottom:14px;padding:10px 12px;border-radius:8px;background:#f5f5f5}.writing-suggestions-title{margin:0 0 6px;font-size:13px;font-weight:700;color:#333}.writing-suggestions-text{margin:0;font-size:13px;color:#333;line-height:1.6}.writing-sample-toggle{border:none;background:none;padding:4px 0;font-size:13px;font-weight:600;color:#666;cursor:pointer}.writing-sample-toggle:hover{color:#e60012}.writing-sample-text{margin:10px 0 0;padding:12px 14px;border-radius:8px;background:#fafafa;font-family:inherit;font-size:13px;line-height:1.6;color:#333;white-space:pre-wrap;word-break:break-word}.writing-tool-block{margin-bottom:20px;padding-bottom:20px;border-bottom:1px solid #f0f0f0}.writing-tool-block:last-child{margin-bottom:0;padding-bottom:0;border-bottom:none}.writing-tool-label{margin:0 0 10px;font-size:14px;font-weight:700;color:#666}.writing-tool-buttons{display:flex;flex-wrap:wrap;gap:8px}.writing-tool-btn{padding:8px 16px;border:1px solid #e60012;border-radius:999px;background:#fff;color:#666;font-size:13px;cursor:pointer;transition:all .2s}.writing-tool-btn:hover{background:#fef0f0}.writing-tool-btn-active{background:#e60012;color:#fff}.writing-tool-btn-active:hover{background:#e60012}.writing-history-empty{margin:0;font-size:13px;color:#999}.writing-history-item{display:flex;flex-direction:column;gap:2px;width:100%;margin-bottom:8px;padding:10px 12px;border:1px solid #eee;border-radius:8px;background:#fafafa;text-align:left;cursor:pointer;transition:all .2s}.writing-history-item:hover{border-color:#e60012;background:#fef0f0}.writing-history-topic{font-size:13px;color:#333;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.writing-history-meta{font-size:12px;color:#999}.writing-write-body::-webkit-scrollbar,.writing-feedback-body::-webkit-scrollbar,.writing-tools-content::-webkit-scrollbar{width:6px}.writing-write-body::-webkit-scrollbar-thumb,.writing-feedback-body::-webkit-scrollbar-thumb,.writing-tools-content::-webkit-scrollbar-thumb{background:#ddd;border-radius:3px}.writing-write-body::-webkit-scrollbar-thumb:hover,.writing-feedback-body::-webkit-scrollbar-thumb:hover,.writing-tools-content::-webkit-scrollbar-thumb:hover{background:#bbb}@media(max-width:900px){.writing-layout{height:auto;padding:0;overflow-y:auto}.writing-cards{flex-direction:column;height:auto;overflow:visible;border-radius:0}.writing-write,.writing-feedback,.writing-tools{flex:none;height:auto;border-right:none;border-bottom:2px solid #f0f0f0}.writing-tools{border-bottom:none}.writing-textarea{min-height:300px}}.writing-gen-btn{width:100%;padding:10px 0;border:1px dashed #e60012;border-radius:10px;background:#fef0f0;color:#e60012;font-size:14px;font-weight:600;cursor:pointer;transition:background .2s}.writing-gen-btn:hover{background:#fde8ea}.writing-topic-list{display:block;max-height:280px;overflow-y:auto;padding-bottom:16px;margin-bottom:10px}.writing-topic-card{display:block;width:100%;padding:9px 12px;border:1px solid #e5e5e5;border-radius:8px;background:#fff;color:#333;font-size:13px;line-height:1.5;text-align:left;cursor:pointer;transition:border-color .2s,background .2s,color .2s;word-break:break-word;box-sizing:border-box}.writing-topic-card+.writing-topic-card{margin-top:8px}.writing-topic-card:hover{border-color:#e60012}.writing-topic-card-active,.writing-topic-card-active:hover{border-color:#e60012;background:#fef0f0;color:#e60012;font-weight:600}.writing-gen-modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#00000073;display:flex;align-items:center;justify-content:center;z-index:1000}.writing-gen-modal{width:360px;max-width:90vw;background:#fff;border-radius:16px;box-shadow:0 12px 40px #0003;overflow:hidden}.writing-gen-modal-head{display:flex;align-items:center;justify-content:space-between;padding:16px 20px;border-bottom:1px solid #f0f0f0}.writing-gen-modal-title{font-size:16px;font-weight:700;color:#1a1a1a}.writing-gen-modal-close{border:none;background:none;font-size:22px;line-height:1;color:#999;cursor:pointer;padding:0 4px}.writing-gen-modal-close:hover{color:#333}.writing-gen-modal-body{padding:16px 20px}.writing-gen-field-label{margin:0 0 10px;font-size:13px;font-weight:700;color:#666}.writing-gen-field-label:not(:first-child){margin-top:16px}.writing-gen-error{margin:12px 0 0;font-size:13px;color:#e60012}.writing-gen-modal-foot{display:flex;justify-content:flex-end;gap:10px;padding:14px 20px;border-top:1px solid #f0f0f0}.writing-gen-cancel{padding:8px 20px;border:1px solid #e5e5e5;border-radius:999px;background:#fff;color:#666;font-size:14px;cursor:pointer;transition:background .2s}.writing-gen-cancel:hover{background:#f5f5f5}.writing-gen-start{padding:8px 24px;border:none;border-radius:999px;background:#e60012;color:#fff;font-size:14px;font-weight:600;cursor:pointer;transition:background .2s}.writing-gen-start:hover:not(:disabled){background:#c5000f}.writing-gen-start:disabled{opacity:.6;cursor:not-allowed}*{box-sizing:border-box}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Microsoft YaHei,sans-serif;background:#f5f6f8;color:#1f2329}button{cursor:pointer;border:none;border-radius:6px;padding:8px 16px;font-size:14px;background:#2563eb;color:#fff;transition:opacity .15s}button:hover{opacity:.9}button:disabled{opacity:.5;cursor:not-allowed}input,textarea{width:100%;padding:10px 12px;border:1px solid #d1d5db;border-radius:6px;font-size:14px;font-family:inherit;margin-bottom:12px}label{display:block;font-size:13px;margin-bottom:4px;color:#4b5563}.center{display:flex;justify-content:center;align-items:center;min-height:60vh;color:#6b7280}