:root{--bg: #F5F5F7;--surface: #FFFFFF;--surface-alt: #F0F0F5;--text: #1C1C1E;--text-secondary: #8E8E93;--text-tertiary: #A1A1A6;--text-inverse: #FFFFFF;--accent: #1C1C1E;--accent-soft: rgba(28, 28, 30, .08);--border: rgba(0, 0, 0, .08);--border-medium: rgba(0, 0, 0, .15);--divider: #E5E5EA;--success: #22C55E;--success-bg: rgba(34, 197, 94, .1);--warning: #F59E0B;--warning-bg: rgba(245, 158, 11, .1);--error: #FF3B30;--error-bg: rgba(255, 59, 48, .1);--radius-sm: 8px;--radius-md: 12px;--radius-lg: 14px;--radius-xl: 20px;--shadow-card: 0 1px 3px rgba(0, 0, 0, .08), 0 4px 12px rgba(0, 0, 0, .04)}@media (prefers-color-scheme: dark){:root{--bg: #000000;--surface: #1C1C1E;--surface-alt: #2C2C2E;--text: #FAFAFA;--text-secondary: #8E8E93;--text-tertiary: #636366;--text-inverse: #000000;--accent: #E5E5EA;--accent-soft: rgba(255, 255, 255, .08);--border: rgba(255, 255, 255, .08);--border-medium: rgba(255, 255, 255, .15);--divider: #2C2C2E;--shadow-card: 0 1px 3px rgba(0, 0, 0, .3), 0 4px 12px rgba(0, 0, 0, .2)}}*{box-sizing:border-box}html,body{height:100%;margin:0;padding:0}body{background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;line-height:1.5;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}#root{min-height:100vh}button{font-family:inherit;font-size:15px;font-weight:600;border:none;border-radius:var(--radius-md);padding:12px 20px;cursor:pointer;transition:opacity .15s ease,transform .05s ease}button:active{transform:translateY(1px)}button:disabled{opacity:.4;cursor:not-allowed}button:disabled:active{transform:none}.btn-primary{background:var(--accent);color:var(--text-inverse)}.btn-secondary{background:var(--surface-alt);color:var(--text)}.btn-danger{background:var(--error-bg);color:var(--error)}textarea{font-family:inherit;font-size:14px;background:var(--surface);color:var(--text);border:1px solid var(--border-medium);border-radius:var(--radius-md);padding:12px;resize:vertical;min-height:80px;width:100%}textarea:focus{outline:2px solid var(--accent);outline-offset:-1px}code,.mono{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:12px}