*,:before,:after{box-sizing:border-box;margin:0;padding:0}:root{--bg-primary:#fafbfc;--bg-secondary:#fff;--bg-card:#f0f2f5;--bg-gradient:linear-gradient(145deg, #fafbfc 0%, #eef2f7 100%);--bg-header:#ffffffd9;--text-primary:#1a1a2e;--text-secondary:#64748b;--accent:#2563eb;--accent-hover:#1d4ed8;--accent-light:#dbeafe;--success:#16a34a;--success-light:#dcfce7;--error:#dc2626;--border:#e2e8f0;--shadow:0 1px 3px #00000014, 0 1px 2px #0000000f;--shadow-lg:0 10px 25px #0000001a;--radius:12px;--toggle-bg:#e2e8f0}[data-theme=dark]{--bg-primary:#0f172a;--bg-secondary:#1e293b;--bg-card:#334155;--bg-gradient:linear-gradient(145deg, #0f172a 0%, #162036 100%);--bg-header:#0f172ad9;--text-primary:#f1f5f9;--text-secondary:#94a3b8;--accent:#3b82f6;--accent-hover:#2563eb;--accent-light:#3b82f626;--success:#22c55e;--success-light:#22c55e26;--error:#ef4444;--border:#334155;--shadow:0 1px 3px #0000004d;--shadow-lg:0 10px 25px #0006;--toggle-bg:#475569}.feature-card{text-align:center;background:var(--bg-secondary);border:1px solid var(--border);cursor:default;border-radius:12px;padding:1rem .75rem;transition:transform .2s,box-shadow .2s,border-color .2s}.feature-card:hover{border-color:var(--accent);transform:translateY(-2px);box-shadow:0 4px 16px #00000014}body{background:var(--bg-primary);color:var(--text-primary);min-height:100vh;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Microsoft JhengHei,sans-serif;font-size:16px;line-height:1.6;transition:background .3s,color .3s}#root{flex-direction:column;min-height:100vh;display:flex}