*{box-sizing:border-box}:root{--bg: #f4f5f7;--surface: #ffffff;--border: #e2e4e9;--text: #1b1e24;--text-muted: #6b7280;--primary: #2563eb;--primary-hover: #1d4ed8;--danger: #dc2626;--success: #16a34a;--radius: 10px}body{margin:0;font-family:Segoe UI,system-ui,-apple-system,sans-serif;background:var(--bg);color:var(--text)}h1{font-size:22px;margin:0 0 20px}h2{margin:0 0 16px}.app-shell{min-height:100vh}.nav{display:flex;align-items:center;gap:20px;padding:14px 24px;background:var(--surface);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:10;flex-wrap:wrap}.nav-brand{font-weight:700;font-size:18px;color:var(--primary);margin-right:auto}.nav-links{display:flex;gap:6px}.nav-links a{padding:8px 14px;border-radius:var(--radius);text-decoration:none;color:var(--text-muted);font-weight:500;font-size:14px}.nav-links a.active,.nav-links a:hover{background:#eef2ff;color:var(--primary)}.page{max-width:960px;margin:0 auto;padding:28px 20px 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