*{box-sizing:border-box;margin:0;padding:0}:root{--primary: #6366f1;--primary-dark: #4f46e5;--primary-light: #eef2ff;--success: #22c55e;--danger: #ef4444;--bg: #f1f5f9;--surface: #ffffff;--border: #e2e8f0;--text: #1e293b;--muted: #64748b;--radius: 8px;--shadow: 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.06);--shadow-md: 0 4px 12px rgba(0,0,0,.1)}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Noto Sans SC,sans-serif;background:var(--bg);color:var(--text);font-size:14px;line-height:1.6}a{text-decoration:none;color:inherit}.app-header{height:56px;background:var(--surface);border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;padding:0 20px;position:sticky;top:0;z-index:100;box-shadow:var(--shadow)}.header-left{display:flex;align-items:center;gap:28px}.logo{font-size:15px;font-weight:700;color:var(--primary);white-space:nowrap}nav{display:flex;gap:2px}nav a{padding:5px 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