:root{--bg: #f4f6fb;--bg-grad: linear-gradient(160deg, #f0f2f7 0%, #f4f6fb 40%, #f1f3f8 100%);--card-bg: rgba(255,255,255,.92);--card-border: rgba(0,0,0,.06);--text: #1f2430;--text-2: #6b7280;--accent: #6366f1;--accent-soft: rgba(99,102,241,.12);--shadow: 0 6px 24px rgba(31,41,55,.08);--input-bg: rgba(255,255,255,.9);--chip-bg: rgba(255,255,255,.85);--chip-active: #6366f1;--brand-solid: #55627a}[data-theme=dark]{--bg: #0d1117;--bg-grad: linear-gradient(160deg, #11141a 0%, #0d1117 45%, #0f1319 100%);--card-bg: rgba(24,29,40,.88);--card-border: rgba(255,255,255,.08);--text: #e6e9f0;--text-2: #9aa3b2;--accent: #818cf8;--accent-soft: rgba(129,140,248,.16);--shadow: 0 6px 24px rgba(0,0,0,.45);--input-bg: rgba(24,29,40,.9);--chip-bg: rgba(24,29,40,.85);--chip-active: #818cf8;--brand-solid: #394152}*{margin:0;padding:0;box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{font-family:PingFang SC,Microsoft YaHei,Segoe UI,system-ui,sans-serif;background:var(--bg-grad) 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