:root{--bg: #f6f7f9;--card: #ffffff;--border: #e3e6ea;--text: #1c2126;--muted: #6b7480;--brand: #2563eb;--brand-ink: #ffffff;--danger: #dc2626}*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text)}a{color:var(--brand);text-decoration:none}a:hover{text-decoration:underline}.topbar{display:flex;align-items:center;gap:20px;padding:0 20px;height:56px;background:var(--card);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:10}.topbar .brand{font-weight:700;font-size:18px}.topbar nav{display:flex;gap:4px}.topbar nav a{padding:8px 12px;border-radius:8px;color:var(--text);font-size:14px}.topbar nav a.active{background:#eef2ff;color:var(--brand)}.topbar .spacer{flex:1}.topbar .user{color:var(--muted);font-size:13px;white-space:nowrap}.nav-toggle{display:none;background:none;border:1px solid var(--border);border-radius:8px;font-size:18px;line-height:1;padding:7px 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