:root{--ink:#17243d;--muted:#778197;--line:#e9edf3;--surface:#fff;--bg:#f7f9fc;--navy:#182f6a;--blue:#4c66df;--mint:#50bead;--peach:#ffba91;--radius:24px;--shadow:0 14px 48px rgba(22,40,82,.055);font-family:Inter,"Segoe UI",-apple-system,BlinkMacSystemFont,"Noto Sans SC","Microsoft YaHei",Arial,sans-serif;line-height:1.5;color:var(--ink)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg)}button,input{font:inherit}button,a{-webkit-tap-highlight-color:transparent}button{cursor:pointer}a{color:inherit;text-decoration:none}a:focus-visible,button:focus-visible,input:focus-visible{outline:3px solid #7b8ef3;outline-offset:3px}svg{display:block}#app{min-height:100vh}.shell{display:grid;grid-template-columns:238px minmax(0,1fr);min-height:100vh}.sidebar{position:sticky;top:0;height:100vh;background:#fff;border-right:1px solid var(--line);padding:32px 21px;display:flex;flex-direction:column;gap:36px;z-index:4}.brand{display:flex;align-items:center;gap:12px;padding:3px 8px}.logo{width:43px;height:43px;border-radius:15px;background:var(--navy);display:grid;place-items:center;color:#fff;box-shadow:0 7px 16px rgba(23,47,104,.17)}.brand-title{font-size:18px;letter-spacing:-.7px;font-weight:850}.brand-sub{color:#8e97a8;font-size:11px;font-weight:650;letter-spacing:.07em;text-transform:uppercase}.nav-label{color:#a4abb8;text-transform:uppercase;font-size:10px;letter-spacing:.19em;font-weight:800;padding:0 13px 12px}.nav-set{display:flex;flex-direction:column;gap:6px}.nav-link{display:flex;align-items:center;gap:12px;color:#69768c;padding:12px 13px;border-radius:12px;font-size:13px;font-weight:700;transition:background .18s,color .18s}.nav-link 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#eff1f6;padding-top:13px;display:flex;justify-content:space-between;align-items:center;font-size:11px;color:#8b98ac}.card-bottom b{font-size:11px;color:#5870c1}.mini-icon{display:grid;place-items:center;width:29px;height:29px;background:#f0f3ff;border-radius:10px;color:#536cc6}.more-grid{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:21px;margin:29px 0}.feature-panel{border-radius:23px;background:#fff;border:1px solid #e9edf4;padding:22px;display:flex;align-items:center;justify-content:space-between;gap:24px}.feature-panel h3{margin:7px 0 7px;font-size:19px;letter-spacing:-.5px}.feature-panel p{font-size:12px;line-height:1.6;color:#8d97aa;max-width:480px}.feature-mark{background:#e7f7f2;border-radius:18px;padding:24px;font-size:48px}.metrics{display:flex;gap:20px;flex-wrap:wrap;margin-top:16px}.metric strong{font-size:20px;display:block;letter-spacing:-.7px}.metric 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0;letter-spacing:-.6px}.detail-banner p{margin:0;color:#79889b;font-size:12px}.panel{background:#fff;border-radius:19px;border:1px solid var(--line);padding:20px;margin-top:17px}.panel h2{font-size:16px;margin:0 0 16px}.panel .hint{font-size:12px;color:#8b96a9;line-height:1.65}.word-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:11px}.word-card{border:1px solid var(--line);border-radius:14px;overflow:hidden;background:#fff;min-width:0}.word-card .word-image{height:116px;background:linear-gradient(135deg,#f2f5ff,#e9f6ed);display:grid;place-items:center;font-size:43px}.word-image img{width:100%;height:100%;object-fit:contain}.word-body{padding:11px}.word-body b{display:block;font-size:13px;overflow-wrap:anywhere}.word-body small{display:block;font-size:11px;color:#8996a8;min-height:16px}.audio-row{display:flex;align-items:center;gap:7px;margin-top:10px;flex-wrap:wrap}.audio-button{border:1px solid #dee7f7;background:#f6f9ff;border-radius:9px;color:#4866b3;font-size:10px;font-weight:800;padding:7px 10px;display:inline-flex;align-items:center;gap:4px}.audio-button:hover{background:#e9f0ff}.sentence{border-top:1px solid var(--line);padding:12px 0}.sentence:first-child{border-top:0}.sentence b{font-size:13px}.sentence p{font-size:12px;color:#8b97a6;margin:4px 0}.aside-meta{display:flex;justify-content:space-between;gap:5px;margin:10px 0;font-size:11px;color:#8c98ab}.aside-meta strong{color:#283e69}.empty-state{border-radius:18px;background:#fff;border:1px dashed #ccd6ea;padding:36px;text-align:center;color:#8f9bad;font-size:12px}.empty-state h3{color:#394968;font-size:16px;margin-bottom:6px}.footer{border-top:1px solid var(--line);margin-top:42px;padding-top:22px;display:flex;gap:14px;justify-content:space-between;flex-wrap:wrap;font-size:10px;color:#99a6b7}.mobile-top{display:none}.quiz-q{padding:13px 0;border-bottom:1px solid var(--line);font-size:12px}.quiz-q:last-child{border:0}.quiz-q b{display:block;margin-bottom:7px}.quiz-choice{color:#8591a3;margin:4px 0;font-size:11px}.status-info{background:#eff8f6;padding:12px;border-radius:11px;font-size:11px;color:#3d8a78;line-height:1.6}.global-error{max-width:720px;margin:10vh auto;background:#fff;border:1px solid #eddfdf;padding:35px;border-radius:20px}#toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);background:#253458;color:#fff;padding:13px 20px;border-radius:13px;z-index:12;font-size:12px;box-shadow:0 8px 25px #1116}.hidden{display:none!important}
@media(max-width:1190px){.cards{grid-template-columns:repeat(2,minmax(0,1fr))}.more-grid{grid-template-columns:1fr}.hero-art{min-width:230px}.floating-card{right:170px}.art-slab{right:40px}.detail-banner h1{font-size:20px}}@media(max-width:900px){.shell{display:block}.sidebar{display:none}.main{padding:24px 20px 40px}.mobile-top{display:flex;align-items:center;gap:10px;margin-bottom:22px}.mobile-top .brand-title{font-size:16px}.mobile-links{display:flex;gap:8px;overflow:auto;scrollbar-width:none}.mobile-links a{background:#fff;border:1px solid #e8edf4;padding:9px 14px;border-radius:12px;font-size:12px;color:#536380;white-space:nowrap}.mobile-links .active{background:#edf0ff;color:#3853b3}.topbar-left{display:none}.topbar{justify-content:space-between;margin-bottom:16px}.hero-copy{padding-left:30px;width:65%}.hero-art{min-width:200px}.floating-card{right:145px}}@media(max-width:600px){.main{padding:15px 14px 30px}.topbar-right{width:100%;justify-content:space-between}.top-tag{display:none}.search-box{flex:1;min-width:0}.hero{min-height:294px}.hero-copy{padding:27px 24px 30px;width:100%}.hero h1{font-size:31px;max-width:300px}.hero p{font-size:12px;max-width:270px}.hero-art{display:none}.cards{grid-template-columns:1fr}.lesson-list,.details-grid{grid-template-columns:1fr}.word-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.card-cover{height:151px}.detail-banner{padding:19px;gap:15px}.detail-banner-art{width:76px;height:94px;font-size:37px}.detail-banner h1{font-size:18px}.feature-panel{padding:18px}.feature-mark{padding:13px;font-size:33px}.section-head h2{font-size:17px}.avatar{display:none}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;transition:none!important}}

.brand-accent{color:#5777d6}.brand-aux{font-weight:600;color:#8d97a8;font-size:12px}.crumb-current{color:#4d618e}.planned-visual{font-size:47px}.panel-topless{margin-top:0}.badge-block{margin-top:19px}.lesson-list-offset{margin-top:20px}.detail-cover-img{width:100%;height:100%;object-fit:cover;border-radius:15px}.quiz-picture{display:block;object-fit:contain;width:130px;max-height:110px;border-radius:10px;margin:9px 0;background:#f4f7fe}
.feature-panel-block{display:block}

.quiz-select{display:inline-flex;align-items:center;gap:8px;text-align:left;border:1px solid #dfe7f2;border-radius:11px;background:#f9fbff;color:#4c638d;min-height:38px;padding:8px 12px;font-size:11px;font-weight:750;max-width:100%;margin:4px 7px 4px 0;flex-wrap:wrap}.quiz-select:hover{background:#ebf2ff}.quiz-select.correct{background:#e1f8ec;border-color:#64caa1;color:#23835e}.quiz-select.try-again{background:#fff1eb;border-color:#ffc5b5;color:#bd634c}.quiz-select.completed{opacity:.58}.quiz-select:disabled{cursor:default}.quiz-feedback{min-height:19px;font-size:11px;color:#b17a36;font-weight:800;padding-top:4px}.quiz-feedback.correct{color:#2c976e}