:root {
    --bg-main: #f1f5f9;
    --bg-card: #ffffff;
    --primary: #2563eb;
    --text-color: #0f172a;
    --border-color: #cbd5e1;
}

* { box-sizing: border-box; margin: 0; padding: 0; font-family: system-ui, -apple-system, sans-serif; }
body { background: var(--bg-main); color: var(--text-color); display: flex; flex-direction: column; min-height: 100vh; }

.app-header { background: #1e293b; color: #fff; padding: 1rem; }
.header-container { display: flex; justify-content: space-between; align-items: center; max-width: 1200px; margin: 0 auto; width: 100%; }
.logo a { color: #fff; font-weight: bold; font-size: 1.25rem; text-decoration: none; }
.nav-menu { display: flex; gap: 1rem; }
.nav-menu a { color: #94a3b8; text-decoration: none; display: flex; align-items: center; gap: 0.25rem; }
.nav-menu a:hover { color: #fff; }
.burger-menu { display: none; background: none; border: none; color: #fff; font-size: 1.5rem; cursor: pointer; }

.main-content { flex: 1; max-width: 1200px; width: 100%; margin: 2rem auto; padding: 0 1rem; }

.app-footer { background: #0f172a; color: #64748b; padding: 1.5rem 1rem; text-align: center; font-size: 0.875rem; }
.footer-container { max-width: 1200px; margin: 0 auto; display: flex; flex-direction: column; gap: 0.5rem; }
.footer-links a { color: #94a3b8; text-decoration: none; }

.card { background: var(--bg-card); padding: 1.5rem; border-radius: 8px; border: 1px solid var(--border-color); margin-bottom: 1.5rem; }
.form-group { margin-bottom: 1rem; }
.form-group label { display: block; margin-bottom: 0.5rem; font-weight: 600; }
.form-control { width: 100%; padding: 0.6rem; border: 1px solid var(--border-color); border-radius: 4px; }
.btn { padding: 0.6rem 1.2rem; background: var(--primary); color: #fff; border: none; border-radius: 4px; cursor: pointer; text-decoration: none; display: inline-flex; align-items: center; gap: 0.5rem; }
.btn-danger { background: #ef4444; }
.btn-secondary { background: #64748b; }

.color-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 1rem; }
.table { width: 100%; border-collapse: collapse; margin-top: 1rem; }
.table th, .table td { border: 1px solid var(--border-color); padding: 0.75rem; text-align: left; }

@media (max-width: 768px) {
    .burger-menu { display: block; }
    .nav-menu { display: none; flex-direction: column; position: absolute; top: 60px; left: 0; width: 100%; background: #1e293b; padding: 1rem; z-index: 100; }
    .nav-menu.active { display: flex; }
}