:root{--bg-body: #f6f8fb;--bg-surface: #ffffff;--text-main: #111827;--text-muted: #6b7280;--border-subtle: #e5e7eb;--shadow: 0 10px 30px rgba(17, 24, 39, .08);--green: #16a34a;--blue: #2563eb;--amber: #f59e0b;--red: #ef4444;--radius: 16px}*{box-sizing:border-box}html,body{height:100%}body{margin:0;font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,"Apple Color Emoji","Segoe UI Emoji";background:var(--bg-body);color:var(--text-main)}#app{min-height:100vh}.app-shell{min-height:100vh;display:flex;flex-direction:column}.topbar{position:sticky;top:0;z-index:5;display:flex;align-items:center;justify-content:space-between;padding:14px 18px;background:var(--bg-surface);border-bottom:1px solid var(--border-subtle)}.topbar-left{display:flex;gap:12px;align-items:center}.brand-icon{width:40px;height:40px;border-radius:14px;display:grid;place-items:center;color:#fff;font-weight:800;background:linear-gradient(135deg,var(--green),#0f7a4b);box-shadow:0 10px 25px 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