:root{--red:#18181b;--red-hover:#3f3f46;--accent-soft:#f4f4f5;--text:#09090b;--text-2:#52525b;--text-3:#71717a;--silver:#a1a1aa;--sand:#f4f4f5;--sand-hover:#e4e4e7;--fog:#f4f4f5;--border:#e4e4e7;--border-strong:#d4d4d8;--focus:#2563eb;--ai:#7c3aed;--star:#f59e0b;--error:#dc2626;--bg:#f4f4f5;--card:#fff;--r-sm:6px;--r:8px;--r-lg:10px;--r-xl:12px;--sidebar-w:240px;--topbar-h:60px;--font:system-ui, -apple-system, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Roboto, "Helvetica Neue", Arial, sans-serif}*{box-sizing:border-box}html,body{margin:0;padding:0}body{font-family:var(--font);color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased;-webkit-tap-highlight-color:transparent;font-size:15px;line-height:1.5}a{color:inherit;text-decoration:none}button,input,textarea,select{font:inherit;color:inherit}img{max-width:100%;display:block}:focus-visible{outline:2px solid var(--focus);outline-offset:2px}.sr-only{clip:rect(0 0 0 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