:root{--bg: #0f172a;--card: #1e293b;--ink: #f1f5f9;--muted: #94a3b8;--accent: #4f46e5;--accent-d: #4338ca;--good: #16a34a;--warn: #f59e0b;--bad: #ef4444;--line: #334155}*{box-sizing:border-box}html,body{margin:0;background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;-webkit-font-smoothing:antialiased;overflow-x:hidden}.wrap{max-width:480px;margin:0 auto;padding:16px 16px 96px}h1{font-size:1.5rem;margin:0}h2{font-size:1.3rem;margin:0}.muted{color:var(--muted)}button{font:inherit;cursor:pointer;border:none;border-radius:12px;padding:14px 18px;background:var(--accent);color:#fff;min-height:48px}button:active{background:var(--accent-d)}input,select{font:inherit;width:100%;padding:14px;border-radius:12px;border:1px solid var(--line);background:var(--card);color:var(--ink);min-height:48px}.card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:16px;margin:12px 0}.topbar{display:flex;align-items:center;gap:10px;margin:12px 0 4px}.tagline{margin:0 0 14px;font-size:.95rem}.pill{display:inline-block;padding:4px 10px;border-radius:999px;font-size:.72rem;font-weight:700;letter-spacing:.03em}.pro-badge{background:var(--good);color:#fff}.diff-easy{background:#16a34a33;color:#4ade80}.diff-medium{background:#f59e0b33;color:#fbbf24}.diff-hard{background:#ef444433;color:#f87171}.tabs{display:flex;gap:8px;margin-bottom:14px}.tab{flex:1;background:var(--card);color:var(--muted);border:1px solid var(--line);min-height:48px}.tab.on{background:var(--accent);color:#fff;border-color:var(--accent)}.chips{display:flex;flex-wrap:wrap;gap:8px;margin:12px 0}.chip{background:var(--card);color:var(--muted);border:1px solid var(--line);padding:10px 14px;min-height:44px;border-radius:999px;font-size:.9rem}.chip.on{background:var(--accent);color:#fff;border-color:var(--accent)}.knot-list{display:flex;flex-direction:column;gap:0}.knot-card{display:flex;flex-direction:column;align-items:flex-start;gap:4px;text-align:left;width:100%;background:var(--card);color:var(--ink);border:1px solid var(--line)}.knot-card-top{display:flex;align-items:center;justify-content:space-between;width:100%}.knot-name{font-size:1.1rem;font-weight:700}.star{color:var(--warn);font-size:1.1rem}.knot-meta{font-size:.8rem;color:var(--warn);font-weight:600}.knot-best{font-size:.88rem;line-height:1.4}.empty{text-align:center;padding:32px 8px;line-height:1.5}.back{margin-bottom:4px}.detail-head{display:flex;align-items:center;justify-content:space-between;gap:10px}.best{margin:8px 0 4px;line-height:1.45}.knot-art{width:100%;height:200px;background:#0b1120;border:1px solid var(--line);border-radius:12px;margin:12px 0;display:block}.stepper{display:flex;align-items:center;justify-content:space-between;gap:8px}.step-count{font-size:.9rem;color:var(--muted);white-space:nowrap}.ghost{background:var(--card);color:var(--ink);border:1px solid var(--line);padding:12px 14px}.ghost:active{background:var(--bg)}.ghost:disabled{opacity:.4}.step-text{background:#4f46e524;border-left:3px solid var(--accent);padding:12px 14px;border-radius:8px;line-height:1.5;margin:14px 0;font-size:1rem}.all-steps{padding-left:20px;margin:0 0 16px}.all-steps li{padding:8px 6px;line-height:1.4;color:var(--muted);cursor:pointer;border-radius:6px}.all-steps li.active{color:var(--ink);background:#ffffff0a}.saved{background:var(--good)}.saved:active{background:#15803d}.upgrade{border-color:var(--accent);background:#4f46e51f;text-align:center}.upgrade p{margin:0 0 12px}.btn-link{display:inline-block;width:100%;background:var(--accent);color:#fff;text-decoration:none;padding:14px 18px;border-radius:12px;min-height:48px;font-weight:600}.btn-link:active{background:var(--accent-d)}