:root{--bg-dark:#faf4e8;--bg-card:#fffdf7;--bg-card-hover:#fdf7ea;--bg-input:#fff;--accent-cyan:#3d7a2e;--accent-green:#4c8c3a;--accent-red:#c0392b;--text-primary:#141414;--text-secondary:#6f6656;--border-color:#e6dbc4}*{margin:0;padding:0;box-sizing:border-box}.mono,a{overflow-wrap:anywhere}body{font-family:DM Sans,sans-serif;line-height:1.55;background:radial-gradient(circle at 20% 20%,rgba(61,122,46,.06) 0,transparent 40%),radial-gradient(circle at 80% 80%,rgba(76,140,58,.05) 0,transparent 40%),var(--bg-dark);color:var(--text-primary);min-height:100vh}a{color:var(--accent-cyan);text-decoration:none}.container{width:94%;max-width:1500px;margin:0 auto;padding:20px}.narrow{max-width:640px}.logo{font-size:clamp(1.5rem,4.5vw,2.2rem);font-weight:700;letter-spacing:-1px;background:linear-gradient(135deg,var(--accent-cyan),var(--accent-green));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.tagline{color:var(--text-secondary);margin-top:6px}.card{background:var(--bg-card);border:1px solid var(--border-color);border-radius:16px;padding:24px;margin-bottom:16px}.card h2{font-size:1.15rem;margin-bottom:12px}label{display:block;color:var(--text-secondary);font-size:.85rem;margin:14px 0 6px}input,select,textarea{width:100%;background:var(--bg-input);border:1px solid var(--border-color);border-radius:10px;color:var(--text-primary);padding:12px 14px;font-family:DM Sans,sans-serif;line-height:1.55;font-size:1rem}input:focus,select:focus,textarea:focus{outline:2px solid var(--accent-cyan);outline-offset:1px;border-color:transparent}.btn{display:inline-block;border:none;border-radius:10px;padding:12px 22px;font-family:DM Sans,sans-serif;line-height:1.55;font-weight:600;font-size:1rem;cursor:pointer}.btn-primary{background:transparent;border:none;color:var(--accent-cyan);font-weight:700}.btn-primary:disabled{opacity:.5;cursor:default}.btn-ghost{background:transparent;border:none;color:var(--accent-cyan)}.btn-block{width:100%;margin-top:18px}.error{color:var(--accent-red);font-size:.9rem;margin-top:10px}.notice{background:var(--bg-card-hover);border:1px solid var(--border-color);color:var(--text-primary);padding:10px 14px;border-radius:10px}.muted{color:var(--text-secondary);font-size:.9rem}.mono{font-family:JetBrains Mono,monospace}.topnav{justify-content:space-between;padding:18px 0;flex-wrap:wrap;gap:10px}.topnav,.topnav .links{display:flex;align-items:center}.topnav .links{gap:18px}.topnav .links a{color:var(--text-secondary);font-size:.95rem}.topnav .links a:hover{color:var(--text-primary)}.ladder{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));grid-gap:12px;gap:12px}.set-card{background:var(--bg-card);border:1px solid var(--border-color);border-radius:14px;padding:16px;cursor:pointer;transition:background .15s,transform .15s}.set-card:hover{background:var(--bg-card-hover);transform:translateY(-2px)}.set-card.locked{opacity:.45;cursor:not-allowed}.set-card .set-num{font-family:JetBrains Mono,monospace;color:var(--text-secondary);font-size:.8rem}.set-card .set-name{font-weight:600;margin:4px 0 8px}.stars{color:var(--accent-cyan);letter-spacing:2px}.stars .off{color:var(--border-color)}.qgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));grid-gap:12px;gap:12px}.qcard{background:var(--bg-card);border:1px solid var(--border-color);border-radius:12px;padding:14px}.qprompt{font-family:JetBrains Mono,monospace;font-size:1.15rem;margin-bottom:10px}.qcard.right{border-color:var(--accent-green)}.qcard.wrong{border-color:var(--accent-red)}.timer{font-family:JetBrains Mono,monospace;font-size:1.6rem;color:var(--accent-cyan)}.frac{display:inline-flex;flex-direction:column;align-items:center;vertical-align:middle;margin:0 4px}.frac .num{border-bottom:1.5px solid var(--text-primary)}.frac .den,.frac .num{padding:0 5px}table{width:100%;border-collapse:collapse}@media (max-width:700px){.card:has(>table),.card:has(table){overflow-x:auto}table{min-width:480px}}td,th{text-align:left;padding:10px 12px;border-bottom:1px solid var(--border-color);font-size:.95rem}th{color:var(--text-secondary);font-weight:500;font-size:.85rem}td.mono{font-family:JetBrains Mono,monospace}@media (prefers-reduced-motion:reduce){.set-card{transition:none}}.policy h1{font-size:1.4rem;margin-bottom:8px}.policy h2{font-size:1.1rem;margin:26px 0 8px;color:var(--accent-cyan)}.policy p{line-height:1.75;color:var(--text-primary);margin-bottom:10px;text-indent:0}.policy p+p{text-indent:1.5em}table.memo{width:auto;margin:4px 0 6px;border:1px solid var(--border-color);border-radius:10px;border-collapse:separate;border-spacing:0;overflow:hidden}table.memo td,table.memo th{padding:8px 14px;border-bottom:1px solid var(--border-color);font-family:JetBrains Mono,monospace;font-size:.9rem}table.memo tr:last-child td{border-bottom:none}table.memo td:first-child{color:var(--accent-cyan)}h1{font-size:1.4rem}h3{font-size:1rem}@media (max-width:480px){.container{width:100%;padding:14px}}.memo{font-variant-ligatures:none;font-feature-settings:"liga" 0,"calt" 0,none}