:root{--bg:#f4f6fb;--surface:#fff;--text:#1a1d26;--text-secondary:#6b7280;--border:#e5e8f0;--primary:#2563eb;--primary-light:#dbeafe;--success:#059669;--success-bg:#d1fae5;--danger:#dc2626;--danger-bg:#fee2e2;--warn:#d97706;--radius:14px;--shadow:0 2px 12px #0f172a14;color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased;-webkit-tap-highlight-color:transparent;font-family:-apple-system,BlinkMacSystemFont,PingFang SC,Helvetica Neue,sans-serif;line-height:1.5}*{box-sizing:border-box;margin:0;padding:0}body{min-height:100dvh;overflow-x:hidden}#root{min-height:100dvh}button{font:inherit;cursor:pointer;background:0 0;border:none}.page{max-width:640px;padding:16px 16px calc(16px + env(safe-area-inset-bottom));min-height:100dvh;margin:0 auto}.loading-screen{min-height:100dvh;color:var(--text-secondary);flex-direction:column;justify-content:center;align-items:center;gap:16px;display:flex}.spinner{border:3px solid var(--border);border-top-color:var(--primary);border-radius:50%;width:36px;height:36px;animation:.8s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}.hero{padding:24px 0 32px}.hero-label{color:var(--primary);letter-spacing:.05em;margin-bottom:8px;font-size:13px;font-weight:600}.hero h1{font-size:28px;font-weight:700;line-height:1.2}.hero-desc{color:var(--text-secondary);margin-top:10px;font-size:15px}.subject-list{flex-direction:column;gap:14px;display:flex}.subject-card{background:var(--surface);border-radius:var(--radius);text-align:left;box-shadow:var(--shadow);border:2px solid #0000;padding:20px;transition:transform .15s,border-color .15s}.subject-card:not(.disabled):active{border-color:var(--accent,var(--primary));transform:scale(.98)}.subject-card.disabled{opacity:.65}.subject-top{justify-content:space-between;align-items:center;margin-bottom:8px;display:flex}.subject-short{background:color-mix(in srgb, var(--accent,var(--primary)) 12%, 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.chapter-hero-inner{padding:22px 20px 20px;position:relative}.knowledge-root .chapter-hero h1{letter-spacing:-.02em;margin-bottom:10px;font-size:clamp(1.6rem,4vw,2rem);font-weight:750}.knowledge-root .chapter-hero .chapter-tip{-webkit-line-clamp:4;max-width:42em;min-height:0;margin-bottom:16px}.knowledge-root .chapter-hero-stats{grid-template-columns:repeat(3,1fr);gap:10px;display:grid}.knowledge-root .chapter-hero-stats>div{border:1px solid var(--border);background:#00000040;border-radius:12px;flex-direction:column;gap:2px;padding:10px;display:flex}.knowledge-root .chapter-hero-stats strong{font-size:13px;font-weight:650}.knowledge-root .chapter-hero-stats span{color:var(--text-3);font-size:11px}.knowledge-root .chapter-example-hint{color:var(--text-2);background:#fbbf2414;border:1px solid #fbbf2433;border-radius:12px;margin:-4px 0 16px;padding:12px 14px;font-size:13px;line-height:1.55}.knowledge-root .chapter-example-hint strong{color:#fcd34d}.knowledge-root .legend{color:var(--text-2);flex-wrap:wrap;gap:14px;margin-bottom:20px;padding:0 2px;font-size:12px;display:flex}.knowledge-root .legend>span{align-items:center;gap:6px;display:inline-flex}.knowledge-root .section-block{margin-bottom:28px}.knowledge-root .section-title{color:var(--text-2);border-left:3px solid color-mix(in srgb, var(--accent,#34d399) 70%, transparent);margin-bottom:12px;padding-left:10px;font-size:.95rem;font-weight:650}.knowledge-root .points-list{flex-direction:column;gap:10px;display:flex}.knowledge-root .point-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);transition:border-color .15s,box-shadow .15s;overflow:hidden}.knowledge-root .point-card.open{border-color:color-mix(in srgb, var(--accent,#34d399) 35%, var(--border));box-shadow:0 8px 28px #00000040}.knowledge-root .point-card.mastered{border-color:#34d39959}.knowledge-root .point-card.mastered .point-title-row h3:after{content:" ✓";color:#34d399;font-size:.85em}.knowledge-root .point-head{text-align:left;align-items:flex-start;gap:10px;width:100%;padding:16px;display:flex}.knowledge-root .point-head-main{flex:1;min-width:0}.knowledge-root .point-chapter{color:var(--text-3);margin-bottom:6px;font-size:11px;display:block}.knowledge-root .point-title-row{flex-wrap:wrap;align-items:center;gap:8px 12px;margin-bottom:6px;display:flex}.knowledge-root .point-title-row h3{letter-spacing:-.01em;font-size:1.02rem;font-weight:680}.knowledge-root .point-summary{color:var(--text-2);font-size:13px;line-height:1.5}.knowledge-root .point-tags{flex-wrap:wrap;gap:6px;margin-top:10px;display:flex}.knowledge-root .chevron{color:var(--text-3);flex-shrink:0;margin-top:4px;font-size:14px;transition:transform .2s}.knowledge-root .chevron.up{transform:rotate(180deg)}.knowledge-root .point-body{border-top:1px solid var(--border);margin-top:-2px;padding:14px 16px 16px;animation:.2s fadeIn}@keyframes fadeIn{0%{opacity:0;transform:translateY(-4px)}to{opacity:1;transform:none}}.knowledge-root .formula{border:1px solid var(--border);background:#00000047;border-radius:12px;flex-direction:column;gap:6px;margin-bottom:12px;padding:12px 14px;display:flex}.knowledge-root .formula-label{color:#67e8f9;letter-spacing:.06em;text-transform:uppercase;font-size:11px;font-weight:700}.knowledge-root .formula code{font-family:var(--mono);color:#e0f2fe;white-space:pre-wrap;word-break:break-word;font-size:13px}.knowledge-root .bullet-list{flex-direction:column;gap:8px;margin-bottom:12px;list-style:none;display:flex}.knowledge-root .bullet-list li{color:var(--text);padding-left:16px;font-size:13.5px;line-height:1.55;position:relative}.knowledge-root .bullet-list li:before{content:"";background:var(--accent,#34d399);width:6px;height:6px;box-shadow:0 0 8px color-mix(in srgb, var(--accent,#34d399) 50%, transparent);border-radius:50%;position:absolute;top:.55em;left:0}.knowledge-root .tip-box{background:#fbbf2414;border:1px solid #fbbf2438;border-radius:12px;align-items:flex-start;gap:10px;margin-bottom:12px;padding:12px 14px;display:flex}.knowledge-root .tip-box p{color:#fde68a;font-size:13px;line-height:1.5}.knowledge-root .tip-icon{flex-shrink:0}.knowledge-root .block{margin-bottom:14px}.knowledge-root .block-label{letter-spacing:.08em;text-transform:uppercase;color:var(--text-3);margin-bottom:8px;font-size:11px;font-weight:700}.knowledge-root .block-label-row{justify-content:space-between;align-items:center;margin-bottom:8px;display:flex}.knowledge-root .block-label-row .block-label{margin-bottom:0}.knowledge-root .text-btn{color:#6ee7b7;padding:2px 6px;font-size:12px}.knowledge-root .text-btn:hover{text-decoration:underline}.knowledge-root .detail-block{border:1px solid var(--border);background:#00000038;border-radius:14px;padding:14px}.knowledge-root .detail-body{scrollbar-width:thin;scrollbar-color:#ffffff26 transparent;flex-direction:column;gap:10px;max-height:420px;padding-right:4px;display:flex;overflow-y:auto}.knowledge-root .detail-subhead{color:#67e8f9;margin-top:4px;font-size:13px;font-weight:700}.knowledge-root .detail-para{color:#e2e8f0;white-space:pre-wrap;word-break:break-word;font-size:13.5px;line-height:1.7}.knowledge-root .tip-extra{opacity:.9;margin-top:6px}.knowledge-root .muted-pill{opacity:.75}.knowledge-root .detail-pill{color:#6ee7b7!important;background:#34d3991f!important;border-color:#34d39947!important}.knowledge-root .formula code+code{margin-top:6px}.knowledge-root .loading-screen{min-height:100dvh;color:var(--text-2);background:var(--bg0);flex-direction:column;justify-content:center;align-items:center;gap:16px;display:flex}.knowledge-root .spinner{border:3px solid var(--border);border-top-color:#34d399;border-radius:50%;width:36px;height:36px;animation:.8s linear infinite spin}.knowledge-root .master-btn{border:1px solid var(--border);width:100%;color:var(--text-2);background:#ffffff0f;border-radius:12px;padding:11px;font-size:13px;font-weight:650;transition:background .15s,color .15s,border-color .15s}.knowledge-root .master-btn:hover{color:var(--text);background:#ffffff1a}.knowledge-root .master-btn.on{color:#6ee7b7;background:#34d39926;border-color:#34d39966}.knowledge-root .stars{white-space:nowrap;align-items:center;gap:6px;font-size:12px;display:inline-flex}.knowledge-root .stars-icons{letter-spacing:1px;color:var(--amber);font-size:12px}.knowledge-root .stars-dim{color:#ffffff1f}.knowledge-root .stars-1 .stars-icons{color:#94a3b8}.knowledge-root .stars-2 .stars-icons{color:#fbbf24}.knowledge-root .stars-3 .stars-icons{color:#f59e0b;text-shadow:0 0 10px #f59e0b73}.knowledge-root .stars-label{color:var(--text-3);font-size:11px}.knowledge-root .search-view .search-bar-wrap{align-items:center;gap:10px;margin-bottom:16px;display:flex}.knowledge-root .search-input{background:var(--surface-2);border:1px solid var(--border-strong);color:var(--text);border-radius:14px;outline:none;flex:1;padding:14px 16px}.knowledge-root .search-input:focus{border-color:#34d39973;box-shadow:0 0 0 3px #34d3991f}.knowledge-root .search-input::placeholder{color:var(--text-3)}.knowledge-root .search-count{color:var(--text-3);white-space:nowrap;font-size:12px}.knowledge-root .empty{text-align:center;color:var(--text-3);padding:40px 16px;font-size:14px}.knowledge-root .example-pill{color:#fcd34d!important;background:#fbbf241f!important;border-color:#fbbf244d!important}.knowledge-root .examples-list{flex-direction:column;gap:12px;display:flex}.knowledge-root .example-card{border:1px solid var(--border);background:#00000047;border-radius:14px;padding:14px}.knowledge-root .example-card.revealed{border-color:#34d39947}.knowledge-root .example-meta{flex-wrap:wrap;align-items:center;gap:8px;margin-bottom:10px;display:flex}.knowledge-root .example-id{color:var(--text-2);font-variant-numeric:tabular-nums;font-size:12px;font-weight:700}.knowledge-root .example-stem{color:var(--text);margin-bottom:12px;font-size:14px;line-height:1.65}.knowledge-root .example-options{flex-direction:column;gap:8px;margin-bottom:12px;list-style:none;display:flex}.knowledge-root .example-option{border:1px solid var(--border);background:#ffffff0a;border-radius:12px;grid-template-columns:28px 1fr;align-items:flex-start;gap:10px;padding:10px 12px;display:grid}.knowledge-root .example-option.is-answer{background:#34d3991f;border-color:#34d39966}.knowledge-root .example-opt-key{width:28px;height:28px;color:var(--text-2);background:#ffffff14;border-radius:8px;flex-shrink:0;justify-content:center;align-items:center;font-size:13px;font-weight:750;display:inline-flex}.knowledge-root .example-option.is-answer .example-opt-key{color:#6ee7b7;background:#34d39940}.knowledge-root .example-opt-text{color:#e2e8f0;padding-top:3px;font-size:13.5px;line-height:1.55}.knowledge-root .example-reveal-btn{color:#fcd34d;background:#fbbf241a;border:1px solid #fbbf2447;border-radius:10px;width:100%;padding:10px;font-size:13px;font-weight:650}.knowledge-root .example-reveal-btn:hover{background:#fbbf2429}.knowledge-root .example-answer-box{border-top:1px dashed var(--border);margin-top:12px;padding-top:12px;animation:.2s fadeIn}.knowledge-root .example-answer{color:#6ee7b7;margin-bottom:8px;font-size:14px}.knowledge-root .example-answer strong{letter-spacing:.06em;font-size:1.15em}.knowledge-root .example-expl{color:var(--text-2);font-size:13px;line-height:1.65}.knowledge-root .example-card.calc{border-color:#38bdf838}.knowledge-root .calc-pill{color:#7dd3fc!important;background:#38bdf824!important;border-color:#38bdf859!important}.knowledge-root .calc-placeholder{color:var(--text-3);background:#38bdf80f;border:1px dashed #38bdf840;border-radius:8px;margin-bottom:12px;padding:8px 10px;font-size:12.5px}.knowledge-root .calc-solution{flex-direction:column;gap:8px;margin-top:4px;display:flex}.knowledge-root .calc-step{color:#e2e8f0;font-size:13.5px;line-height:1.65}.knowledge-root .calc-formula-line{font-family:var(--mono);color:#e0f2fe;border:1px solid var(--border);white-space:pre-wrap;word-break:break-word;background:#00000047;border-radius:10px;padding:10px 12px;font-size:13px;line-height:1.55}.knowledge-root .calc-tip{color:#fde68a;background:#fbbf2414;border:1px solid #fbbf2433;border-radius:10px;padding:10px 12px;font-size:13px;line-height:1.55}.knowledge-root .calc-note{color:var(--text-3);margin-top:6px;font-size:12px}