:root{--bg: #f6f7f9;--surface: #ffffff;--surface-2: #f0f2f5;--border: #d9dde3;--text: #1a1d21;--muted: #5c636e;--brand: #2f6df6;--brand-ink: #ffffff;--correct-bg: #e6f6ec;--correct-border: #34a853;--correct-ink: #14683a;--wrong-bg: #fdeaea;--wrong-border: #d93a3a;--wrong-ink: #8a1f1f;--radius: 12px;--shadow: 0 1px 3px rgba(16, 24, 40, .08), 0 1px 2px rgba(16, 24, 40, .06)}@media (prefers-color-scheme: dark){:root:not([data-theme=light]){--bg: #0e1116;--surface: #171b21;--surface-2: #1f242c;--border: #2b323c;--text: #e7eaee;--muted: #9aa3af;--brand: #5b8dff;--brand-ink: #0e1116;--correct-bg: #12331f;--correct-border: #2f8a4e;--correct-ink: #7fe0a0;--wrong-bg: #3a1717;--wrong-border: #b84a4a;--wrong-ink: #f0a3a3;--shadow: none}}:root[data-theme=dark]{--bg: #0e1116;--surface: #171b21;--surface-2: #1f242c;--border: #2b323c;--text: #e7eaee;--muted: #9aa3af;--brand: #5b8dff;--brand-ink: #0e1116;--correct-bg: #12331f;--correct-border: #2f8a4e;--correct-ink: #7fe0a0;--wrong-bg: #3a1717;--wrong-border: #b84a4a;--wrong-ink: #f0a3a3;--shadow: none}*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.5}a{color:var(--brand);text-decoration:none}a:hover{text-decoration:underline}.container{max-width:820px;margin:0 auto;padding:0 16px 64px}.site-header{border-bottom:1px solid var(--border);background:var(--surface);position:sticky;top:0;z-index:10}.site-header .inner{max-width:820px;margin:0 auto;padding:12px 16px;display:flex;align-items:center;gap:16px}.site-header .brand{font-weight:700;font-size:1.05rem;color:var(--text)}.site-header nav{display:flex;gap:14px;margin-left:auto;align-items:center}.site-header nav a{color:var(--muted);font-weight:500}.site-header nav a.active{color:var(--text)}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:20px}.grid{display:grid;gap:14px}@media (min-width: 620px){.grid.cols-2{grid-template-columns:1fr 1fr}}.btn{font:inherit;font-weight:600;border:1px solid var(--border);background:var(--surface-2);color:var(--text);padding:10px 16px;border-radius:10px;cursor:pointer}.btn:hover{border-color:var(--brand)}.btn:disabled{opacity:.5;cursor:not-allowed}.btn.primary{background:var(--brand);color:var(--brand-ink);border-color:var(--brand)}.btn.primary:hover{filter:brightness(1.05)}.row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}.spacer{flex:1}.muted{color:var(--muted)}.small{font-size:.88rem}.tag{display:inline-block;font-size:.72rem;font-weight:700;letter-spacing:.03em;text-transform:uppercase;padding:2px 8px;border-radius:999px;background:var(--surface-2);color:var(--muted);border:1px solid var(--border)}.bar{height:8px;background:var(--surface-2);border-radius:999px;overflow:hidden}.bar>span{display:block;height:100%;background:var(--brand)}.domain-card{text-align:left;cursor:pointer;width:100%}.domain-card h3{margin:0 0 4px}.option{display:flex;gap:10px;align-items:flex-start;border:1px solid var(--border);background:var(--surface);border-radius:10px;padding:12px 14px;margin:8px 0;cursor:pointer}.option:hover{border-color:var(--brand)}.option.selected{border-color:var(--brand);box-shadow:inset 0 0 0 1px var(--brand)}.option.correct{background:var(--correct-bg);border-color:var(--correct-border)}.option.wrong{background:var(--wrong-bg);border-color:var(--wrong-border)}.option input{margin-top:3px}.option .fb{display:block;margin-top:6px;font-size:.88rem;color:var(--muted)}.pbq-row{margin:10px 0}.pbq-row label{display:block;font-weight:500;margin-bottom:4px}.pbq-row select{font:inherit;padding:8px 10px;border-radius:8px;border:1px solid var(--border);background:var(--surface);color:var(--text);width:100%}.pbq-row.correct select{border-color:var(--correct-border)}.pbq-row.wrong select{border-color:var(--wrong-border)}.pbq-row .fb{font-size:.86rem;margin-top:4px}.fb.correct{color:var(--correct-ink)}.fb.wrong{color:var(--wrong-ink)}.explanation{margin-top:14px;padding:12px 14px;background:var(--surface-2);border-radius:10px;border:1px solid var(--border)}.verdict{font-weight:700}.verdict.correct{color:var(--correct-ink)}.verdict.wrong{color:var(--wrong-ink)}.field{margin-bottom:12px}.field label{display:block;font-weight:600;margin-bottom:4px;font-size:.9rem}.field input{font:inherit;width:100%;padding:10px 12px;border-radius:10px;border:1px solid var(--border);background:var(--surface);color:var(--text)}.error{color:var(--wrong-ink);font-size:.9rem}.notice{background:var(--surface-2);border:1px solid var(--border);border-radius:10px;padding:10px 14px}h1{font-size:1.6rem}.center{text-align:center}