/* ---------- 全局重置 & 变量 ---------- */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        * {
            transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
        }
        :focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
            border-radius: 4px;
        }

        :root {
            --bg-primary: #0b0d11;
            --bg-secondary: #14181f;
            --bg-card: #1a1f2a;
            --bg-input: #232a36;
            --bg-hover: #2c3442;
            --border-color: #2d3748;
            --text-primary: #edf2f7;
            --text-secondary: #a0b4c8;
            --text-muted: #6b7d98;
            --accent: #6c8cff;
            --accent-2: #9a6cff;
            --accent-glow: rgba(108, 140, 255, 0.15);
            --accent-hover: #7a9aff;
            --accent-gradient: linear-gradient(135deg, #6c8cff 0%, #9a6cff 100%);
            --shadow: 0 2px 6px rgba(0, 0, 0, 0.24), 0 8px 28px rgba(0, 0, 0, 0.28);
            --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.18), 0 2px 8px rgba(0, 0, 0, 0.22);
            --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.35), 0 24px 64px rgba(0, 0, 0, 0.25);
            --radius: 16px;
            --radius-sm: 10px;
            --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            --font-display: 'Space Grotesk', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            --scrollbar-track: var(--bg-secondary);
            --scrollbar-thumb: rgba(255, 255, 255, 0.2);
            --scrollbar-thumb-hover: rgba(255, 255, 255, 0.35);
            --sidebar-width: 320px;
            --sidebar-collapsed: 0px;
            --code-bg: rgba(0, 0, 0, 0.6);
            --code-font: 'Cascadia Code', 'Fira Code', 'Consolas', 'Monaco', 'Menlo', monospace;
        }

        [data-theme="light"] {
            --bg-primary: #f1f4f9;
            --bg-secondary: #ffffff;
            --bg-card: #ffffff;
            --bg-input: #f0f2f5;
            --bg-hover: #e9ecf0;
            --border-color: #d0d7de;
            --text-primary: #1f2328;
            --text-secondary: #484f58;
            --text-muted: #8b949e;
            --accent: #2d6aff;
            --accent-2: #6d5cff;
            --accent-glow: rgba(45, 106, 255, 0.15);
            --accent-hover: #4a7cff;
            --accent-gradient: linear-gradient(135deg, #2d6aff 0%, #6d5cff 100%);
            --shadow: 0 1px 3px rgba(0, 0, 0, 0.08), 0 8px 24px rgba(0, 0, 0, 0.10);
            --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.06), 0 2px 6px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12), 0 24px 48px rgba(0, 0, 0, 0.10);
            --scrollbar-track: #e1e4e8;
            --scrollbar-thumb: rgba(0, 0, 0, 0.15);
            --scrollbar-thumb-hover: rgba(0, 0, 0, 0.3);
            --code-bg: rgba(0, 0, 0, 0.06);
        }

        html, body {
            height: 100%;
            font-family: var(--font);
            background: var(--bg-primary);
            color: var(--text-primary);
            overflow: hidden;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            text-rendering: optimizeLegibility;
        }
        body {
            background:
                radial-gradient(900px 420px at 12% -12%, rgba(108, 140, 255, 0.07), transparent 62%),
                radial-gradient(800px 420px at 88% 112%, rgba(154, 108, 255, 0.06), transparent 62%),
                var(--bg-primary);
        }
        [data-theme="light"] body {
            background:
                radial-gradient(900px 420px at 12% -12%, rgba(45, 106, 255, 0.06), transparent 62%),
                radial-gradient(800px 420px at 88% 112%, rgba(109, 92, 255, 0.05), transparent 62%),
                var(--bg-primary);
        }

        /* ===== 滚动条样式 ===== */
        ::-webkit-scrollbar {
            width: 6px;
            height: 6px;
        }
        ::-webkit-scrollbar-track {
            background: transparent;
        }
        ::-webkit-scrollbar-thumb {
            background: var(--scrollbar-thumb);
            border-radius: 10px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: var(--scrollbar-thumb-hover);
        }

        /* Toast样式 */
        .toast, .notification { background: var(--toast-bg); color: var(--toast-text); border: 1px solid var(--toast-border); box-shadow: var(--toast-shadow); backdrop-filter: blur(18px); }
        :root { --toast-bg: rgba(250,252,255,0.96); --toast-text: #243044; --toast-border: rgba(76,101,135,0.16); --toast-shadow: 0 12px 32px rgba(30,48,78,0.12); }
        [data-theme="dark"] { --toast-bg: rgba(28,33,43,0.96); --toast-text: #e8edf6; --toast-border: rgba(170,190,220,0.14); --toast-shadow: 0 14px 34px rgba(0,0,0,0.30); }