:root{--bg:#eef2ff;--bg-soft:#f5f7ff;--body-bg-overlay:#f8fafc;--bg-card:#fff;--text-primary:#0f172a;--text-secondary:#64748b;--text-tertiary:#94a3b8;--border:#e2e8f0;--border-light:#f1f5f9;--c-indigo:#6366f1;--c-purple:#8b5cf6;--c-pink:#ec4899;--c-blue:#3b82f6;--c-cyan:#06b6d4;--c-green:#10b981;--c-red:#ef4444;--c-amber:#f59e0b;--s-chinese:#f43f5e;--s-math:#6366f1;--s-english:#0ea5e9;--s-physics:#14b8a6;--s-chem:#8b5cf6;--s-bio:#22c55e;--s-history:#d97706;--s-geography:#38bdf8;--s-politics:#ec4899;--s-other:#64748b;--radius-sm:10px;--radius:14px;--radius-lg:18px;--shadow-sm:0 2px 8px #0f172a0d;--shadow:0 6px 18px #0f172a12;--shadow-lg:0 12px 28px #0f172a1a}html.dark{--bg:#0f172a;--bg-soft:#111827;--body-bg-overlay:#1e293b;--bg-card:#1e293b;--text-primary:#f1f5f9;--text-secondary:#94a3b8;--text-tertiary:#64748b;--border:#334155;--border-light:#1e293b;--shadow:0 6px 18px #0006;--shadow-lg:0 12px 28px 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