:root{--color-primary: #6366f1;--color-primary-hover: #4f46e5;--color-primary-soft: rgba(99, 102, 241, .08);--color-bg: #f8fafc;--color-surface: #ffffff;--color-text: #1e293b;--color-text-light: #94a3b8;--color-text-muted: #64748b;--color-border: #e2e8f0;--color-border-strong: #cbd5e1;--color-danger: #ef4444;--color-success: #22c55e;--grad-primary: linear-gradient(120deg, #38bdf8 0%, #818cf8 45%, #e879f9 100%);--grad-primary-soft: linear-gradient(120deg, rgba(56, 189, 248, .1), rgba(232, 121, 249, .08));--glow-primary: 0 6px 18px rgba(129, 140, 248, .4);--accent-strong: #6366f1;--a2ui-code-bg: #f1f5f9;--a2ui-quote-accent: #6366f1;--radius-card: 12px;--radius-input: 10px;--radius-btn: 8px;--radius-pill: 999px;--shadow-card: 0 1px 2px rgba(15, 23, 42, .04), 0 4px 12px rgba(79, 70, 229, .06);--shadow-lift: 0 12px 32px rgba(15, 23, 42, .12), 0 2px 8px rgba(79, 70, 229, .08);--space-xs: 4px;--space-sm: 8px;--space-md: 16px;--space-lg: 24px;--space-xl: 32px;--font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "HarmonyOS Sans SC", "MiSans", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;--font-mono: "JetBrains Mono", "SFMono-Regular", ui-monospace, Menlo, Consolas, "Liberation Mono", monospace}*{box-sizing:border-box}html,body{margin:0;padding:0;height:100%}body{background:var(--color-bg);background-image:radial-gradient(1100px 520px at 85% -10%,rgba(56,189,248,.09),transparent 60%),radial-gradient(900px 460px at -10% 110%,rgba(232,121,249,.09),transparent 60%);background-attachment:fixed;color:var(--color-text);font-family:var(--font-family);font-size:15px;line-height:1.6;font-feature-settings:"tnum";text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}a{color:var(--color-primary);text-decoration:none}a:hover{text-decoration:underline}button{font-family:inherit;cursor:pointer}::selection{background:var(--color-primary-soft)}