:root{--font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;--font-serif: Georgia, "Songti SC", "Times New Roman", "Source Han Serif SC", serif;--font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;--radius-lg: 14px;--radius-md: 10px;--radius-sm: 7px;--nav-h: 56px;--sidebar-w: 276px;--transition: .22s cubic-bezier(.4, 0, .2, 1);--accent-h: 214}:root,:root[data-theme=light]{color-scheme:light;--bg: #f6f7f9;--bg-elev: #ffffff;--bg-sunken: #eef1f5;--bg-hover: rgba(30, 55, 90, .055);--border: #e0e5ec;--border-strong: #c9d2de;--text: #1d2530;--text-2: #566073;--text-3: #8a93a3;--accent: hsl(var(--accent-h) 62% 34%);--accent-soft: hsl(var(--accent-h) 60% 93%);--accent-contrast: #ffffff;--shadow-sm: 0 1px 2px rgba(35, 45, 65, .06);--shadow-md: 0 4px 16px -4px rgba(35, 45, 65, .12);--shadow-lg: 0 12px 40px -12px rgba(35, 45, 65, .22);--bubble-user: hsl(var(--accent-h) 52% 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