:root{--primary: #4f46e5;--primary-hover: #4338ca;--primary-soft: #eef2ff;--text: #0f172a;--text-muted: #64748b;--text-subtle: #94a3b8;--border: #e2e8f0;--surface: #ffffff;--background: #f8fafc;--dark: #0f172a;--success: #059669;--success-soft: #ecfdf5;--warning: #d97706;--warning-soft: #fffbeb;--danger: #e11d48;--danger-soft: #fff1f2;--yellow: #facc15;--text-secondary: #475569;--hover: #f1f5f9;--track: #f1f5f9;--border-strong: #cbd5e1;--on-primary: #ffffff;--series-correct: #2563eb;--series-wrong: #dc2626;--radius: 16px;--shadow-sm: 0 1px 2px rgb(15 23 42 / .04), 0 1px 3px rgb(15 23 42 / .06);--shadow-md: 0 10px 30px -12px rgb(15 23 42 / .18);color-scheme:light;font-family:Inter,system-ui,-apple-system,Segoe UI,sans-serif;color:var(--text);background:var(--background);-webkit-font-smoothing:antialiased}[data-theme=dark]{--primary: #6366f1;--primary-hover: #818cf8;--primary-soft: rgb(99 102 241 / .16);--text: #e2e8f0;--text-muted: #94a3b8;--text-subtle: #64748b;--text-secondary: #cbd5e1;--border: #1e293b;--border-strong: #334155;--surface: #0f172a;--background: #020617;--dark: #e2e8f0;--hover: #1e293b;--track: #1e293b;--success: #34d399;--success-soft: rgb(52 211 153 / .12);--warning: #fbbf24;--warning-soft: rgb(251 191 36 / .12);--danger: #fb7185;--danger-soft: rgb(251 113 133 / .12);--shadow-sm: 0 1px 2px rgb(0 0 0 / .4);--shadow-md: 0 10px 30px -12px rgb(0 0 0 / .6);--series-correct: #3b82f6;--series-wrong: #ef4444;color-scheme:dark;color:var(--text)}[data-theme=dark] .btn--dark{color:#0f172a}[data-theme=dark] .btn--dark:hover:not(:disabled){background:#cbd5e1}*,*:before,*:after{box-sizing:border-box}body{margin:0;background:var(--background)}h1,h2,h3,p{margin:0}a{color:var(--primary)}img{max-width:100%;display:block}button,input{font:inherit}:focus-visible{outline:3px solid rgba(79,70,229,.45);outline-offset:2px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:0 20px;border:1px solid transparent;border-radius:10px;font-size:15px;font-weight:600;text-decoration:none;cursor:pointer;transition:background .15s,border-color .15s,transform .15s}.btn:active{transform:translateY(1px)}.btn:disabled{opacity:.55;cursor:not-allowed}.btn--primary{color:#fff;background:var(--primary);box-shadow:0 6px 16px -6px #4f46e599}.btn--primary:hover:not(:disabled){background:var(--primary-hover)}.btn--dark{color:#fff;background:var(--dark)}.btn--dark:hover:not(:disabled){background:#1e293b}.btn--yellow{color:var(--text);background:var(--yellow)}.btn--yellow:hover:not(:disabled){background:#eab308}.btn--outline{color:var(--text);background:var(--surface);border-color:var(--border)}.btn--outline:hover:not(:disabled){border-color:var(--border-strong)}.btn--ghost{color:var(--text);background:transparent}.btn--ghost:hover:not(:disabled){background:var(--hover)}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-sm)}.icon-badge{display:grid;place-items:center;width:44px;height:44px;border-radius:12px;flex-shrink:0}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);border:0}.btn--soft{color:var(--text);background:var(--hover)}.btn--soft:hover:not(:disabled){background:var(--border)}.page-head{display:flex;flex-wrap:wrap;align-items:flex-start;justify-content:space-between;gap:20px}.page-head h1{font-size:clamp(1.7rem,3vw,2.1rem);font-weight:800;letter-spacing:-.025em}.page-head p{margin-top:6px;color:var(--text-muted);font-size:16px}.page-head__actions{display:flex;flex-wrap:wrap;gap:12px}.state{margin-top:28px;padding:40px 24px;color:var(--text-muted);text-align:center}.link{padding:0;border:0;color:var(--primary);background:none;font-weight:600;text-decoration:underline;cursor:pointer}.tone--indigo{color:var(--primary);background:var(--primary-soft)}.tone--orange{color:#ea580c;background:#fff7ed}.tone--blue{color:#2563eb;background:#eff6ff}.tone--purple{color:#9333ea;background:#faf5ff}.tone--green{color:var(--success);background:var(--success-soft)}.tone--rose{color:var(--danger);background:var(--danger-soft)}.tone--amber{color:var(--warning);background:var(--warning-soft)}[data-theme=dark] .tone--orange{color:#fb923c;background:#fb923c1f}[data-theme=dark] .tone--blue{color:#60a5fa;background:#60a5fa1f}[data-theme=dark] .tone--purple{color:#c084fc;background:#c084fc1f}.doc{max-width:760px;color:var(--text);font-size:16px;line-height:1.7}.doc h1{font-size:clamp(1.9rem,4vw,2.5rem);font-weight:800;letter-spacing:-.025em;line-height:1.2}.doc h2{margin-top:40px;font-size:1.35rem;font-weight:700;letter-spacing:-.015em;scroll-margin-top:80px}.doc h3{margin-top:24px;font-size:1.05rem;font-weight:700}.doc p,.doc ul,.doc ol,.doc table,.doc details{margin-top:12px}.doc ul,.doc ol{padding-left:22px}.doc li+li{margin-top:6px}.doc table{width:100%;border-collapse:collapse;font-size:15px}.doc th,.doc td{padding:8px 12px;border-bottom:1px solid var(--border);text-align:left;vertical-align:top}.doc th{color:var(--text-muted);font-weight:600}.doc__lead{margin-top:12px;color:var(--text-muted);font-size:18px}.doc__meta{margin-top:8px;color:var(--text-muted);font-size:14px}.doc__toc{margin-top:28px;padding:20px 24px;border-radius:var(--radius);background:var(--hover);font-size:15px}.doc__toc ol{margin:0;columns:2;column-gap:32px}@media(max-width:600px){.doc__toc ol{columns:1}}.doc__faq{padding:16px 20px;border:1px solid var(--border);border-radius:12px}.doc__faq summary{font-weight:600;cursor:pointer}.doc__faq[open] summary{margin-bottom:8px}.doc__faq+.doc__faq{margin-top:10px}