:root{--bg: #f4f6f9;--surface: #ffffff;--border: #e2e6ec;--text: #1a2233;--text-muted: #6b7280;--brand: #14213d;--accent: #2f6fed;--accent-soft: #eaf1ff;--radius: 10px;--shadow: 0 1px 2px rgba(20, 33, 61, .06), 0 1px 8px rgba(20, 33, 61, .04);font-family:Segoe UI,Inter,system-ui,-apple-system,sans-serif}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text)}.app-shell{min-height:100vh;display:flex;flex-direction:column}.app-header{background:var(--brand);color:#fff;display:flex;align-items:center;justify-content:space-between;padding:14px 28px;position:sticky;top:0;z-index:10;box-shadow:var(--shadow)}.brand{display:flex;align-items:baseline;gap:10px}.brand-mark{font-weight:700;letter-spacing:.08em;font-size:15px}.brand-sub{font-size:13px;color:#cdd5e6}.app-nav{display:flex;gap:4px}.app-nav a{color:#cdd5e6;text-decoration:none;font-size:14px;font-weight:500;padding:8px 14px;border-radius:8px;transition:background .15s,color .15s}.app-nav 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