:root{--bg:#fff;--bg-subtle:#f9fafb;--panel-bg:#fff;--panel-subtle:#f9fafb;--panel-alt:#fafafa;--border:#e5e7eb;--text:#111827;--text-dim:#374151;--accent:#2563eb;--accent-hover:#1d4ed8;--success:#16a34a;--success-bg:#dcfce7;--warn-bg:#fffbeb;--warn-border:#f59e0b}html.theme-dark{--bg:#0d1117;--bg-subtle:#161b22;--panel-bg:#161b22;--panel-subtle:#1c2128;--panel-alt:#1e2530;--border:#30363d;--text:#e6edf3;--text-dim:#9da7b3;--accent:#3b82f6;--accent-hover:#60a5fa;--success:#22c55e;--success-bg:rgba(34,197,94,.12);--warn-bg:rgba(234,179,8,.15);--warn-border:#d97706;color-scheme:dark}body{background:var(--bg);color:var(--text);transition:background .25s ease,color .25s ease}a{color:var(--accent)}a:hover{color:var(--accent-hover)}.panel{background:var(--panel-bg)}.panel,.panel-subtle{border:1px solid var(--border)}.panel-subtle{background:var(--panel-subtle)}.panel-alt{background:var(--panel-alt);border:1px solid var(--border)}.border-base{border-color:var(--border)!important}.bg-subtle{background:var(--bg-subtle)!important}.text-dim{color:var(--text-dim)!important}button.theme-toggle{background:var(--panel-subtle);border:1px solid var(--border);color:var(--text);border-radius:999px;padding:6px 14px;font-size:14px;font-weight:600;cursor:pointer;display:inline-flex;align-items:center;gap:6px;box-shadow:0 2px 4px rgba(0,0,0,.06);transition:background .2s,border-color .2s}button.theme-toggle:hover{background:var(--panel-alt)}button.theme-toggle:active{transform:translateY(1px)}.btn{cursor:pointer;font-weight:600;font-size:14px;line-height:1.15;border-radius:10px;padding:10px 14px;border:1px solid var(--border);background:var(--panel-subtle);color:var(--text);transition:background .18s,border-color .18s,color .18s,opacity .18s}.btn:hover:not(:disabled){background:var(--panel-alt)}.btn:active:not(:disabled){transform:translateY(1px)}.btn:disabled{opacity:.45;cursor:default}.btn-primary{background:var(--accent);color:#fff;border-color:var(--accent)}.btn-primary:hover:not(:disabled){background:var(--accent-hover);border-color:var(--accent-hover)}.btn-success{background:var(--success);color:#fff;border-color:var(--success)}.btn-success:hover:not(:disabled){filter:brightness(1.1)}.btn-outline{background:transparent;color:var(--text)}.btn-outline:hover:not(:disabled){background:var(--panel-subtle)}.btn-ghost{background:transparent;border-color:transparent;color:var(--text-dim)}.btn-ghost:hover:not(:disabled){background:var(--panel-subtle);color:var(--text)}.answer-box{width:38px;height:44px;display:flex;align-items:center;justify-content:center;border-radius:8px;font-size:18px;font-weight:700}.answer-box.alpha{border:2px solid var(--border);background:var(--panel-bg)}.answer-box.nonalpha{border:1px solid var(--border);background:var(--panel-subtle)}.success-banner{max-width:980px;margin:12px auto;padding:16px;border-radius:12px;border:1px solid var(--success);background:var(--success-bg);box-shadow:0 1px 0 rgba(0,0,0,.04)}.success-banner-heading{font-weight:800;color:var(--success)}.success-banner-subline{margin-top:8px;color:var(--text-dim)}html.theme-dark .success-banner{box-shadow:none}.success-review-btn{background:var(--panel-bg);border-color:var(--border);color:var(--text)}.success-review-btn:hover:not(:disabled){background:var(--panel-alt)}html.theme-dark .success-review-btn{background:var(--panel-subtle)}