:root{--font-sans: "Roboto", -apple-system, BlinkMacSystemFont, "Segoe UI", Oxygen, Ubuntu, Cantarell, sans-serif;--font-mono: "JetBrains Mono", "Fira Code", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;--bg-app: #0b0f19;--bg-surface: #131b2e;--bg-surface-raised: #1c2742;--bg-surface-subtle: #243254;--text-primary: #f8fafc;--text-secondary: rgba(248, 250, 252, .72);--text-muted: rgba(248, 250, 252, .48);--seam-border: 1px solid rgba(255, 255, 255, .08);--seam-border-hover: 1px solid rgba(255, 255, 255, .18);--seam-border-active: 1px solid rgba(56, 189, 248, .6);--radius-sm: 8px;--radius-md: 14px;--radius-lg: 18px;--radius-full: 9999px;--primary: #38bdf8;--primary-hover: #0ea5e9;--primary-glow: rgba(56, 189, 248, .2);--accent-success: #10b981;--accent-warning: #f59e0b;--accent-danger: #ef4444;--accent-info: #8b5cf6;--shadow-tactile: 0 0 0 1px rgba(255, 255, 255, .06), 0 4px 20px rgba(0, 0, 0, .4);--shadow-floating: 0 0 0 1px rgba(255, 255, 255, .12), 0 16px 36px rgba(0, 0, 0, .6);--fab-bg: #1c2742;--fab-color: #f8fafc;--fab-border: 1px solid rgba(255, 255, 255, .15);--summary-card-bg: linear-gradient(135deg, rgba(28, 39, 66, .95) 0%, rgba(19, 27, 46, .98) 100%);--subcard-bg: rgba(255, 255, 255, .03);--subcard-border: 1px solid rgba(255, 255, 255, .06);--code-bg: rgba(255, 255, 255, .06)}[data-theme=light]{--bg-app: #f4f6f9;--bg-surface: #ffffff;--bg-surface-raised: #f8fafc;--bg-surface-subtle: #edf2f7;--text-primary: #0f172a;--text-secondary: #475569;--text-muted: #64748b;--seam-border: 1px solid #e2e8f0;--seam-border-hover: 1px solid #cbd5e1;--seam-border-active: 1px solid rgba(2, 132, 199, .6);--primary: #0284c7;--primary-hover: #0369a1;--primary-glow: rgba(2, 132, 199, .15);--accent-success: #059669;--accent-warning: #d97706;--accent-danger: #dc2626;--accent-info: #7c3aed;--shadow-tactile: 0 0 0 1px rgba(0, 0, 0, .05), 0 2px 10px rgba(0, 0, 0, .04);--shadow-floating: 0 0 0 1px rgba(0, 0, 0, .08), 0 14px 32px -4px rgba(0, 0, 0, .12);--fab-bg: #ffffff;--fab-color: #0f172a;--fab-border: 1px solid #cbd5e1;--summary-card-bg: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);--subcard-bg: #f8fafc;--subcard-border: 1px solid #e2e8f0;--code-bg: #f1f5f9}*{box-sizing:border-box;margin:0;padding:0}html,body{overflow-x:hidden;width:100%;max-width:100vw}body{font-family:var(--font-sans);background-color:var(--bg-app);color:var(--text-primary);line-height:1.5;-webkit-font-smoothing:antialiased;min-height:100vh;transition:background-color .25s ease,color .25s ease}.container{max-width:1200px;margin:0 auto;padding:24px 16px 80px}h1,h2,h3,h4{font-weight:600;letter-spacing:-.02em}.font-mono{font-family:var(--font-mono)}.text-muted{color:var(--text-muted)}.text-secondary{color:var(--text-secondary)}.tactile-card{background:var(--bg-surface);border:var(--seam-border);border-radius:var(--radius-md);box-shadow:var(--shadow-tactile);padding:24px;margin-bottom:24px;min-width:0;transition:border-color .2s ease,box-shadow .2s ease,background-color .25s ease}.tactile-card:hover{border-color:var(--seam-border-hover)}.badge{display:inline-flex;align-items:center;gap:6px;padding:4px 10px;font-size:.75rem;font-weight:600;border-radius:var(--radius-full);border:var(--seam-border);text-transform:uppercase;letter-spacing:.05em}.badge-success{background:#10b9811f;color:#10b981;border-color:#10b9814d}[data-theme=light] .badge-success{background:#ecfdf5;color:#047857;border-color:#a7f3d0}.badge-warning{background:#f59e0b1f;color:#f59e0b;border-color:#f59e0b4d}[data-theme=light] .badge-warning{background:#fffbeb;color:#b45309;border-color:#fde68a}.badge-danger{background:#ef44441f;color:#ef4444;border-color:#ef44444d}[data-theme=light] .badge-danger{background:#fef2f2;color:#b91c1c;border-color:#fecaca}.badge-info{background:#38bdf81f;color:var(--primary);border-color:#38bdf84d}[data-theme=light] .badge-info{background:#f0f9ff;color:#0369a1;border-color:#bae6fd}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:10px 18px;font-size:.875rem;font-weight:500;border-radius:var(--radius-sm);cursor:pointer;transition:all .2s ease;border:var(--seam-border);background:var(--bg-surface-raised);color:var(--text-primary);outline:none}.btn:hover{background:var(--bg-surface-subtle);border-color:var(--seam-border-hover)}.btn-primary{background:var(--primary);border-color:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-hover);border-color:var(--primary-hover);box-shadow:0 0 16px var(--primary-glow)}.grid-2{display:grid;grid-template-columns:repeat(auto-fit,minmax(320px,1fr));gap:20px}.grid-3{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:16px}.search-input{width:100%;padding:10px 16px;background:var(--bg-surface-raised);border:var(--seam-border);border-radius:var(--radius-sm);color:var(--text-primary);font-family:var(--font-sans);font-size:.875rem;outline:none;transition:border-color .2s ease,background-color .25s ease}.search-input:focus{border-color:var(--primary)}.theme-fab{position:fixed;bottom:24px;right:24px;z-index:1000;display:flex;align-items:center;gap:8px;padding:10px 16px;border-radius:var(--radius-full);background:var(--fab-bg);color:var(--fab-color);border:var(--fab-border);box-shadow:var(--shadow-floating);cursor:pointer;font-family:var(--font-sans);font-size:.85rem;font-weight:600;transition:all .2s cubic-bezier(.4,0,.2,1);outline:none;user-select:none}.theme-fab:hover{transform:translateY(-2px);border-color:var(--primary);box-shadow:0 0 0 1px var(--primary),var(--shadow-floating)}.theme-fab:active{transform:translateY(0)}.theme-fab .fab-icon{font-size:1.1rem;line-height:1}.theme-fab .fab-label{letter-spacing:.02em}.toc-container{background:var(--bg-surface);border:var(--seam-border);border-radius:var(--radius-md);box-shadow:var(--shadow-tactile)}.sub-item-card{background:var(--subcard-bg);border:var(--subcard-border);border-radius:var(--radius-sm);transition:background-color .2s ease,border-color .2s ease}.toc-nav-card{padding:16px 20px}.toc-pill-btn{padding:8px 14px;font-size:.85rem}.dropzone-card{padding:48px 24px}.modal-content-card{padding:24px}.site-header{display:flex;align-items:center;justify-content:flex-start;padding:16px 0 28px;border-bottom:var(--seam-border);margin-bottom:28px}.site-logo-link{display:inline-flex;align-items:center;text-decoration:none;transition:opacity .2s ease,transform .2s ease}.site-logo-link:hover{opacity:.92;transform:translateY(-1px)}.site-logo{height:52px;width:auto;max-width:100%;object-fit:contain;display:block}.site-footer{margin-top:48px;padding-top:24px;border-top:var(--seam-border);display:flex;flex-direction:column;align-items:center;gap:14px;text-align:center}.footer-links{display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:10px;font-size:.8rem}.footer-link{color:var(--text-secondary);text-decoration:none;font-weight:500;transition:color .2s ease}.footer-link:hover{color:var(--primary);text-decoration:underline}.view-mode-segmented-control{display:inline-flex;background:var(--bg-surface-raised);border:var(--seam-border);border-radius:var(--radius-full);padding:3px;gap:2px}.segment-btn{border:none;background:transparent;color:var(--text-secondary);padding:6px 14px;border-radius:var(--radius-full);font-size:.8rem;font-weight:500;cursor:pointer;display:inline-flex;align-items:center;gap:6px;transition:all .2s ease}.segment-btn:hover{color:var(--text-primary)}.segment-btn.active{background:var(--primary);color:#fff;font-weight:600;box-shadow:0 0 12px var(--primary-glow)}.walkthrough-top-tracker{display:flex;gap:6px;width:100%;margin-bottom:20px}.tracker-segment{flex:1;height:6px;border-radius:var(--radius-full);background:var(--bg-surface-raised);border:var(--seam-border);cursor:pointer;padding:0;transition:all .25s cubic-bezier(.4,0,.2,1);outline:none}.tracker-segment:hover{transform:translateY(-1px);border-color:var(--primary)}.tracker-segment.completed{background:var(--accent-success);border-color:var(--accent-success)}.tracker-segment.active{background:var(--primary);border-color:var(--primary);box-shadow:0 0 12px var(--primary-glow);transform:scaleY(1.3)}.walkthrough-dock{position:fixed;bottom:24px;left:50%;transform:translate(-50%);z-index:90;display:flex;align-items:center;gap:12px;background:#131b2ee0;backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);padding:8px 14px;border:var(--seam-border-hover);border-radius:var(--radius-full);box-shadow:var(--shadow-floating);max-width:calc(100vw - 32px);transition:all .2s ease}[data-theme=light] .walkthrough-dock{background:#ffffffeb}.walkthrough-dock-btn{border-radius:var(--radius-full)!important;padding:8px 16px;font-size:.85rem;white-space:nowrap;flex-shrink:0}.walkthrough-step-indicator{background:transparent;border:none;color:var(--text-primary);cursor:pointer;display:flex;align-items:center;gap:8px;font-size:.85rem;font-weight:600;padding:6px 12px;border-radius:var(--radius-full);transition:background-color .2s ease;white-space:nowrap}.walkthrough-step-indicator:hover{background:var(--bg-surface-subtle)}.walkthrough-step-indicator .step-badge{font-family:var(--font-mono);font-size:.75rem;background:var(--bg-surface-subtle);padding:2px 8px;border-radius:var(--radius-full);border:var(--seam-border)}.walkthrough-step-indicator .step-caret{font-size:.7rem;opacity:.6}.walkthrough-popover-backdrop{position:fixed;inset:0;background:#000000a6;backdrop-filter:blur(6px);z-index:120;display:flex;align-items:center;justify-content:center;padding:16px}.walkthrough-quickjump-popover{max-width:440px;width:100%;max-height:82vh;overflow-y:auto;background:var(--bg-surface);padding:20px;border:var(--seam-border-hover);box-shadow:var(--shadow-floating);margin:0}.popover-step-item{border:var(--seam-border)!important;background:var(--bg-surface-raised)!important;transition:transform .15s ease,border-color .15s ease!important}.popover-step-item:hover{border-color:var(--primary)!important;transform:translate(2px)}.popover-step-item.active{background:var(--primary)!important;border-color:var(--primary)!important;color:#fff!important}.walkthrough-step-enter{animation:walkthroughFadeSlide .25s cubic-bezier(.16,1,.3,1) forwards}@keyframes walkthroughFadeSlide{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}@media (max-width: 640px){.container{padding:12px 12px 100px}.site-header{padding:12px 0 20px;margin-bottom:20px;justify-content:center}.site-logo{height:38px}.site-footer{margin-top:32px;padding-top:16px;gap:10px}.tactile-card{padding:16px;margin-bottom:14px;border-radius:var(--radius-sm)}.dropzone-card{padding:28px 16px}.toc-nav-card{padding:10px 12px;top:8px}.toc-pill-btn{padding:6px 10px;font-size:.75rem;gap:6px}.modal-content-card{padding:16px}.grid-2,.grid-3{grid-template-columns:minmax(0,1fr);gap:10px}.btn{padding:8px 12px;font-size:.8rem}.theme-fab{bottom:76px;right:14px;padding:8px 12px;font-size:.75rem}.search-input{padding:8px 12px;font-size:.8rem}.walkthrough-dock{left:0;right:0;bottom:0;transform:none;width:100%;max-width:100%;border-radius:0;border-left:none;border-right:none;border-bottom:none;justify-content:space-between;padding:10px 12px;gap:6px}.walkthrough-step-indicator .step-name{display:none}.walkthrough-dock-btn{padding:8px 12px;font-size:.75rem}.view-mode-segmented-control .segment-btn{padding:5px 10px;font-size:.75rem}h1{font-size:1.35rem}h2{font-size:1.15rem}h3{font-size:1.05rem}h4{font-size:.9rem}}