:root{--bg: #eef4fb;--bg-card: #ffffff;--bg-soft: #dde8f3;--border: #cfdbe8;--border-strong: #1e3a8a;--text: #0f1f3a;--text-2: #2c3e5d;--muted: #6a7a92;--accent: #1d4ed8;--accent-soft: #dbeafe;--accent-2: #0891b2;--accent-diary: #7c3aed;--shadow-sm: 0 1px 2px rgba(30,58,138,.06);--shadow-md: 0 4px 16px -6px rgba(30,58,138,.16);--shadow-lg: 0 12px 32px -10px rgba(30,58,138,.22);--sidebar-w: 248px;--sidebar-w-collapsed: 64px;--header-h: 58px;--r: 10px;--t: cubic-bezier(.4,0,.2,1);--code-bg: #0f172a;--code-bar-bg: #1e293b;--ie-q-bg: #f5f3ff;--ie-q-text: #6d28d9;--mastery-bg: #f0fdf4;--mastery-border: #86efac;--mastery-text: #166534;--header-blur-bg: rgba(238,244,251,.85);--backdrop: rgba(15,31,58,.55)}[data-theme=dark]{--bg: #0b1220;--bg-card: #131b2f;--bg-soft: #1a253f;--border: #2a3550;--border-strong: #60a5fa;--text: #e6edf7;--text-2: #b6c2d4;--muted: #7e8aa3;--accent: #60a5fa;--accent-soft: #1e3a8a;--accent-2: #22d3ee;--accent-diary: #a78bfa;--shadow-sm: 0 1px 2px rgba(0,0,0,.4);--shadow-md: 0 4px 16px -6px rgba(0,0,0,.55);--shadow-lg: 0 12px 32px -10px rgba(0,0,0,.7);--code-bg: #060b16;--code-bar-bg: #0f172a;--ie-q-bg: #1d1b3a;--ie-q-text: #c4b5fd;--mastery-bg: #0e2a17;--mastery-border: #166534;--mastery-text: #4ade80;--header-blur-bg: rgba(11,18,32,.88);--backdrop: rgba(0,0,0,.65)}html{color-scheme:light dark}html[data-theme=light]{color-scheme:light}html[data-theme=dark]{color-scheme:dark}body{transition:background-color .25s var(--t),color .25s var(--t)}*{box-sizing:border-box;margin:0;padding:0}html,body{height:100%}body{font-family:-apple-system,Apple SD Gothic Neo,Pretendard,SF Pro Text,sans-serif;color:var(--text);background:var(--bg);line-height:1.65;font-size:15px;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}img{max-width:100%;display:block}button{font-family:inherit;cursor:pointer;border:0;background:none;color:inherit}.app{display:block;min-height:100vh}.sidebar{background:var(--bg);border-right:1px solid 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var(--border);border-radius:var(--r);overflow:hidden;margin:28px 0}.code-card .c-intro{padding:16px 20px;font-size:14.5px;color:var(--text-2);line-height:1.7}.code-bar{background:var(--code-bar-bg);color:#ffffff73;font-family:SF Mono,Menlo,monospace;font-size:11.5px;padding:8px 16px;display:flex;align-items:center;gap:10px}.code-bar:before{content:"● ● ●";opacity:.35;font-size:10px}.code-card pre{background:var(--code-bg);color:#e2e8f0;padding:20px;overflow-x:auto;font-family:SF Mono,Menlo,monospace;font-size:13px;line-height:1.65;margin:0}.code-card .c-walk{padding:14px 20px;font-size:13.5px;color:var(--muted);border-top:1px solid var(--border);line-height:1.7}.ie-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--r);overflow:hidden;margin:28px 0}.ie-head{background:var(--accent);color:#fff;padding:13px 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p{font-size:13px;color:var(--text-2);line-height:1.55}.chapter-nav{display:flex;justify-content:space-between;align-items:center;margin-top:60px;padding-top:24px;border-top:1px solid var(--border);gap:12px}.ch-nav-btn{display:flex;align-items:center;gap:7px;padding:10px 18px;border-radius:8px;font-size:13.5px;font-weight:500;border:1px solid var(--border);background:var(--bg-card);color:var(--text-2);transition:all .15s var(--t)}.ch-nav-btn:hover{background:var(--bg-soft);border-color:var(--border-strong);color:var(--text)}.ch-nav-btn.primary{background:var(--text);color:var(--bg);border-color:var(--text)}.ch-nav-btn.primary:hover{opacity:.88}.syl-hero{margin-bottom:40px}.syl-hero h1{font-size:clamp(26px,4vw,36px);font-weight:800;letter-spacing:-.025em;margin-bottom:8px}.syl-hero .sub{font-size:15px;color:var(--muted);margin-bottom:20px}.badges{display:flex;gap:8px;flex-wrap:wrap}.badge{font-family:SF Mono,Menlo,monospace;font-size:11px;font-weight:700;letter-spacing:1px;padding:4px 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60px}.ie-grid{grid-template-columns:1fr}.chapter-nav{flex-direction:column}}[data-theme=dark] .hero-card .cover-fallback,[data-theme=dark] .carousel .card .cover-fallback{background:linear-gradient(135deg,#1e3a8a,#312e81)}[data-theme=dark] .hero-card .cover,[data-theme=dark] .carousel .card .cover{filter:brightness(.9)}.theme-toggle{width:34px;height:34px;border-radius:8px;border:1px solid var(--border);background:var(--bg-card);display:grid;place-items:center;transition:background .15s,border-color .15s}.theme-toggle:hover{background:var(--bg-soft);border-color:var(--border-strong)}.theme-toggle .sun,.theme-toggle .moon{font-size:14px;line-height:1}.theme-toggle .sun{display:none}.theme-toggle .moon,[data-theme=dark] .theme-toggle .sun{display:block}[data-theme=dark] .theme-toggle .moon{display:none}.search-trigger{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--muted);padding:6px 12px 6px 10px;border-radius:8px;border:1px solid var(--border);background:var(--bg-card);min-width:200px;transition:background .15s,border-color .15s}.search-trigger:hover{background:var(--bg-soft);border-color:var(--border-strong)}.search-trigger .search-icon{font-size:13px}.search-trigger .search-label{flex:1;text-align:left}.search-trigger .search-kbd{font-family:SF Mono,Menlo,monospace;font-size:11px;color:var(--muted);padding:2px 6px;border:1px solid var(--border);border-radius:4px;background:var(--bg)}@media(max-width:720px){.search-trigger{min-width:0}.search-trigger .search-label,.search-trigger .search-kbd{display:none}}.search-overlay{position:fixed;inset:0;background:var(--backdrop);display:none;align-items:flex-start;justify-content:center;z-index:200;padding:12vh 16px 16px;animation:fadeIn .12s var(--t)}.search-overlay.open{display:flex}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.search-modal{width:100%;max-width:600px;background:var(--bg-card);border:1px solid var(--border);border-radius:12px;box-shadow:var(--shadow-lg);overflow:hidden;display:flex;flex-direction:column;max-height:70vh}.search-input-wrap{display:flex;align-items:center;gap:10px;padding:14px 18px;border-bottom:1px solid var(--border)}.search-input-wrap .search-input-icon{font-size:16px;color:var(--muted)}.search-input{flex:1;border:0;background:transparent;font-size:15px;outline:0;color:var(--text);font-family:inherit}.search-input::placeholder{color:var(--muted)}.search-results{overflow-y:auto;padding:8px;flex:1}.search-result{display:block;padding:10px 12px;border-radius:8px;text-decoration:none;color:var(--text);margin-bottom:2px}.search-result:hover,.search-result.active{background:var(--bg-soft)}.search-result .sr-cat{font-family:SF Mono,Menlo,monospace;font-size:10px;font-weight:700;letter-spacing:1.2px;color:var(--accent);margin-bottom:2px}.search-result .sr-title{font-size:14px;font-weight:700;letter-spacing:-.01em;line-height:1.35}.search-result .sr-excerpt{font-size:12.5px;color:var(--muted);margin-top:2px;overflow:hidden;text-overflow:ellipsis;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical}.search-empty{padding:32px 18px;text-align:center;color:var(--muted);font-size:13px}.search-footer{display:flex;justify-content:space-between;align-items:center;padding:10px 14px;border-top:1px solid var(--border);font-size:11px;color:var(--muted);background:var(--bg-soft)}.search-footer kbd{font-family:SF Mono,Menlo,monospace;font-size:10.5px;padding:1px 5px;border:1px solid var(--border);border-radius:3px;background:var(--bg-card);margin:0 2px}.course-hero-img{margin:24px 0 32px;text-align:center}.course-hero-img img{max-width:100%;height:auto;border-radius:var(--r);border:1px solid var(--border);box-shadow:var(--shadow-md);margin:0 auto}.course-hero-img figcaption{font-family:SF Mono,Menlo,monospace;font-size:11px;color:var(--muted);margin-top:10px;letter-spacing:.3px}