:root{--bg: #f0f1f6;--panel: rgba(230,232,242,.65);--card: rgba(225,228,240,.55);--text: #1d1d1f;--muted: #86868b;--accent: #0071e3;--accent-hover: #0077ed;--accent-soft: rgba(0,113,227,.08);--border: rgba(100,110,140,.1);--border-strong: rgba(100,110,140,.16);--shadow-sm: 0 2px 8px rgba(0,0,0,.04);--shadow: 0 8px 30px rgba(60,70,100,.08);--shadow-lg: 0 20px 60px rgba(60,70,100,.12);--radius: 16px;--radius-lg: 22px;--radius-xl: 28px;--glass-bg: rgba(230,232,245,.6);--glass-border: rgba(200,205,225,.5);--glass-blur: saturate(180%) blur(20px);--transition: .3s cubic-bezier(.25, .46, .45, .94);--spring: .5s cubic-bezier(.34, 1.56, .64, 1)}[data-theme=dark]{--bg: #121214;--panel: rgba(30,30,34,.75);--card: rgba(38,38,42,.65);--text: #f5f5f7;--muted: #98989d;--accent: #2997ff;--accent-hover: #40a9ff;--accent-soft: rgba(41,151,255,.12);--border: rgba(255,255,255,.08);--border-strong: rgba(255,255,255,.14);--shadow-sm: 0 2px 8px rgba(0,0,0,.2);--shadow: 0 8px 30px rgba(0,0,0,.28);--shadow-lg: 0 20px 60px rgba(0,0,0,.4);--glass-bg: rgba(32,32,38,.72);--glass-border: rgba(255,255,255,.1);--glass-blur: saturate(180%) blur(20px)}[data-theme=dark] .nav{background:#16161ad1;border-bottom-color:#ffffff0f}[data-theme=dark] .nav-dropdown-panel,[data-theme=dark] .search-results{background:#24242af0}[data-theme=dark] .search{background:#ffffff0f}[data-theme=dark] .search:focus-within{background:#282830f2}[data-theme=dark] .hero-card.light{background:#26262cb3;border-color:#ffffff14}[data-theme=dark] .pill{background:#ffffff14;border-color:#ffffff1a}[data-theme=dark] .login-card,[data-theme=dark] .login-page{background:var(--bg)}[data-theme=dark] .login-card{background:var(--glass-bg)}[data-theme=dark] input,[data-theme=dark] textarea,[data-theme=dark] select{background:#ffffff0f!important;color:var(--text);border-color:#ffffff1a!important}[data-theme=dark] input:focus,[data-theme=dark] textarea:focus,[data-theme=dark] select:focus{background:#ffffff17!important;border-color:var(--accent)!important}[data-theme=dark] .section-card{background:var(--glass-bg);border-color:var(--glass-border)}[data-theme=dark] .adm-side{background:#1c1c20d9;border-color:#ffffff0f}[data-theme=dark] .adm-side-item:hover{background:#ffffff0f}[data-theme=dark] .adm-side-item.active{background:#2997ff1f}[data-theme=dark] .adm-panel{background:#202026b3;border-color:#ffffff14}[data-theme=dark] .adm-form-row input,[data-theme=dark] .adm-batch textarea{background:#ffffff0f;border-color:#ffffff1a}[data-theme=dark] .adm-form-row input:focus,[data-theme=dark] .adm-batch textarea:focus{background:#ffffff17;border-color:var(--accent)}[data-theme=dark] .adm-search{background:#ffffff0f;border-color:#ffffff14}[data-theme=dark] .adm-danger-item{background:#ffffff0a}[data-theme=dark] .adm-data-pill{background:#ffffff0a;border-color:#ffffff14}[data-theme=dark] .adm-timeline-item:hover,[data-theme=dark] .adm-comment-item:hover{background:#ffffff0d}[data-theme=dark] .nav-dropdown-item:hover,[data-theme=dark] .search-result-item:hover,[data-theme=dark] .user-menu-item:hover{background:#ffffff0f}[data-theme=dark] .user-menu-logout:hover{background:#ff3b301f}[data-theme=dark] .nav-dropdown-num,[data-theme=dark] .progress-bar-lg,[data-theme=dark] .user-menu-progress-bar,[data-theme=dark] .btn{background:#ffffff14}[data-theme=dark] .btn:hover{background:#ffffff24}[data-theme=dark] .checklist-item:hover{background:#ffffff0a}[data-theme=dark] .comment-box{background:var(--glass-bg);border-color:var(--glass-border)}[data-theme=dark] .profile-page-header{background:var(--glass-bg)}[data-theme=dark] .profile-tab{color:var(--muted)}[data-theme=dark] 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var(--glass-border);background:#f5f6fce0;backdrop-filter:saturate(180%) blur(24px);-webkit-backdrop-filter:saturate(180%) blur(24px);box-shadow:var(--shadow-lg);opacity:0;visibility:hidden;pointer-events:none;transform:translate(-50%) translateY(6px);transition:opacity .2s ease,transform .2s ease,visibility .2s}.nav-dropdown:hover>.nav-dropdown-panel{opacity:1;visibility:visible;pointer-events:auto;transform:translate(-50%) translateY(0)}.nav-dropdown-panel:before{content:"";position:absolute;top:-12px;left:0;right:0;height:12px}.nav-dropdown-wide{min-width:320px}.nav-dropdown-item{display:flex;align-items:center;gap:10px;padding:9px 14px;border-radius:10px;cursor:pointer;font-size:13.5px;font-weight:500;color:var(--text);transition:background .15s ease}.nav-dropdown-item:hover{background:var(--accent-soft)}.nav-dropdown-badge{font-size:11px;font-weight:600;color:var(--accent);background:var(--accent-soft);padding:2px 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12px;border-radius:10px;cursor:pointer;transition:background .15s ease}.search-result-item:hover{background:var(--accent-soft)}.search-result-top{display:flex;align-items:center;gap:8px;margin-bottom:4px}.search-result-badge{font-size:10px;font-weight:700;color:var(--accent);background:var(--accent-soft);padding:2px 7px;border-radius:5px;white-space:nowrap;flex-shrink:0}.search-result-section{font-size:13.5px;font-weight:600;color:var(--text)}.search-result-match{font-size:12px;color:var(--muted);line-height:1.5;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.search-result-field{font-size:10.5px;font-weight:600;color:var(--accent);margin-right:6px;opacity:.7}.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:8px 16px;border-radius:980px;border:none;background:#0000000a;color:var(--text);font-size:13px;font-weight:500;cursor:pointer;transition:all var(--transition);white-space:nowrap}.btn:hover{background:#00000014}.btn:active{transform:scale(.97)}.primary{background:var(--accent);color:#fff;border:none}.primary:hover{background:var(--accent-hover);color:#fff}.primary:disabled{opacity:.5;cursor:not-allowed}.container{padding:32px 24px 60px;max-width:1120px;margin:0 auto}.layout{display:grid;grid-template-columns:1fr 280px;gap:24px;align-items:start}.sidebar{border-radius:var(--radius-lg);padding:20px;position:sticky;top:76px}.sidebar h2{font-size:15px;font-weight:600;color:var(--muted);margin:0 0 12px;letter-spacing:-.2px}.sidebar .list{list-style:none;display:flex;flex-direction:column;gap:4px}.chapter-link{width:100%;padding:10px 14px;border-radius:12px;border:none;background:transparent;color:var(--text);text-align:left;cursor:pointer;font-size:14px;font-weight:500;line-height:1.4;transition:all var(--transition)}.chapter-link:hover{background:#0000000a}.chapter-link.active{background:var(--accent);color:#fff;box-shadow:0 4px 14px #0071e34d}.content h2{font-size:28px;font-weight:700;letter-spacing:-.5px;margin:0 0 4px}.subtitle{color:var(--muted);font-size:15px;margin-bottom:20px}.section-card{border-radius:var(--radius-lg);padding:24px;margin-bottom:16px;transition:transform var(--transition),box-shadow var(--transition)}.section-card:hover{transform:translateY(-1px)}.section-card summary{list-style:none;cursor:pointer;display:flex;align-items:center;gap:10px}.section-card summary::-webkit-details-marker{display:none}.section-card h3{margin:0;font-size:18px;font-weight:600;letter-spacing:-.3px}.section-card h4{margin:20px 0 8px;font-size:13px;font-weight:600;color:var(--accent);text-transform:uppercase;letter-spacing:.5px}.section-card ul,.section-card ol{margin:6px 0 0;padding-left:20px}.section-card li{margin-bottom:4px;font-size:14px;line-height:1.6;color:var(--text);opacity:.85}.arrow{width:8px;height:8px;border-right:2px solid var(--muted);border-bottom:2px solid 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var(--transition);text-decoration:none}.cta:hover{opacity:1;transform:translate(2px)}.cta.primary{background:var(--accent);color:#fff}.cta.light{background:#0000000f;color:var(--text)}.chev{display:inline-block;width:8px;height:8px;border-right:2px solid currentColor;border-top:2px solid currentColor;transform:rotate(45deg);transition:transform var(--transition)}.cta:hover .chev{transform:rotate(45deg) translate(2px)}.hero-progress{display:flex;align-items:center;gap:10px;margin-bottom:14px}.hero-progress-bar{flex:1;height:5px;border-radius:3px;background:#ffffff26;overflow:hidden}.hero-card.light .hero-progress-bar{background:#0000000f}.hero-progress-fill{display:block;height:100%;border-radius:3px;background:#ffffffb3;transition:width .5s ease}.hero-progress-fill.done{background:#34c759}.hero-card.light .hero-progress-fill{background:var(--accent)}.hero-card.light 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