:root{--bg: #f4f6fb;--card: #fff;--primary: #2563eb;--primary-dark: #1d4ed8;--text: #1f2937;--muted: #6b7280;--border: #e5e7eb;--danger: #dc2626;--success: #059669}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,sans-serif;background:var(--bg);color:var(--text)}a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline}.app-shell{min-height:100vh;display:flex;flex-direction:column}.topbar{background:#fff;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;padding:12px 24px;gap:12px}.topbar-left{display:flex;align-items:center;gap:24px;min-width:0;flex:1}.topbar .brand{font-weight:700;font-size:18px;color:var(--primary);white-space:nowrap}.topbar nav{display:flex;flex-wrap:wrap;gap:4px 14px}.topbar nav a{color:var(--text);font-weight:500;padding:4px 0;white-space:nowrap}.topbar nav a.active{color:var(--primary)}.topbar 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