:root{color-scheme:light;--bg: #f4f6fb;--bg-grad-a: #eef1fa;--bg-grad-b: #f7f9fd;--surface: #ffffff;--surface-2: #f7f9fd;--surface-3: #eef2f9;--border: #dee4f0;--border-strong: #c6cfe2;--text: #161a23;--text-muted: #5a6377;--text-faint: #939db3;--primary: #4f46e5;--primary-strong: #4338ca;--primary-soft: #eceafd;--primary-contrast: #ffffff;--accent: #0ea5e9;--accent-soft: #e5f5fe;--cyan: #22d3ee;--correct: #0f9d67;--correct-soft: #e3f7ef;--wrong: #e5484d;--wrong-soft: #fdeaea;--gold: #e9a318;--gold-soft: #fdf3e0;--locked: #a9b2c4;--r-xs: 6px;--r-sm: 10px;--r-md: 14px;--r-lg: 20px;--r-xl: 28px;--r-pill: 999px;--shadow-xs: 0 1px 2px rgba(20, 27, 45, .06);--shadow-sm: 0 2px 8px rgba(20, 27, 45, .07);--shadow-md: 0 10px 26px -12px rgba(20, 27, 45, .22);--shadow-lg: 0 26px 60px -24px rgba(20, 27, 45, .3);--font-ui: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", Roboto, Helvetica, Arial, sans-serif;--font-mono: 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var(--ease-out)}.btn:hover{transform:translateY(-1px);box-shadow:var(--shadow-sm)}.btn:disabled{opacity:.5;cursor:not-allowed;transform:none;box-shadow:none}.btn-primary{background:var(--primary);border-color:var(--primary);color:var(--primary-contrast)}.btn-ghost{background:transparent;border-color:transparent;color:var(--text-muted)}.chip{display:inline-flex;align-items:center;gap:6px;padding:3px 10px;border-radius:var(--r-pill);background:var(--surface-3);color:var(--text-muted);font-size:12px;font-weight:600}.field{display:flex;flex-direction:column;gap:6px}.field label{font-size:13px;font-weight:600;color:var(--text-muted)}.field input{padding:10px 14px;border:1px solid var(--border);border-radius:var(--r-md);background:var(--surface-2);color:var(--text);font:inherit;transition:border-color .16s var(--ease-out),box-shadow .16s var(--ease-out)}.field input:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-soft)}.alert{padding:10px 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