:root {
    --primary: #0F172A;
    --primary-light: #1E293B;
    --accent: #3B82F6;
    --accent-hover: #2563EB;
    --bg-color: #F8FAFC;
    --card-bg: #FFFFFF;
    --text-main: #1E293B;
    --text-muted: #64748B;
    --success: #10B981;
    --danger: #EF4444;
    --warning: #F59E0B;
    --border-color: #E2E8F0;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --radius: 12px;
    --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: 'Inter', sans-serif; background-color: var(--bg-color); color: var(--text-main); line-height: 1.5; }
.navbar { background-color: var(--primary); color: white; padding: 0.75rem 2rem; display: flex; justify-content: space-between; align-items: center; box-shadow: var(--shadow-md); position: sticky; top: 0; z-index: 100; }
.navbar h1 { font-size: 1.25rem; font-weight: 700; display: flex; align-items: center; gap: 10px; }
.nav-links { display: flex; gap: 1.5rem; align-items: center; }
.nav-links a { color: #CBD5E1; text-decoration: none; font-weight: 500; font-size: 0.9rem; transition: var(--transition); }
.nav-links a:hover { color: white; }
.container { max-width: 1200px; margin: 2rem auto; padding: 0 1.5rem; }
.dashboard-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 1.5rem; }
.card { background: var(--card-bg); border-radius: var(--radius); padding: 1.5rem; border: 1px solid var(--border-color); box-shadow: var(--shadow-sm); transition: var(--transition); }
.card:hover { box-shadow: var(--shadow-md); border-color: #CBD5E1; }
.card h3 { font-size: 1.1rem; font-weight: 600; margin-bottom: 1rem; color: var(--primary); }
.btn { display: inline-flex; align-items: center; justify-content: center; padding: 0.5rem 1rem; border-radius: 8px; font-weight: 600; font-size: 0.875rem; cursor: pointer; transition: var(--transition); border: 1px solid transparent; text-decoration: none; gap: 8px; }
.btn-primary { background-color: var(--accent); color: white; }
.btn-primary:hover { background-color: var(--accent-hover); }
.btn-secondary { background-color: white; color: var(--text-main); border-color: var(--border-color); }
.btn-secondary:hover { background-color: #F1F5F9; }
.btn-success { background-color: var(--success); color: white; }
.form-group { margin-bottom: 1.25rem; }
.form-group label { display: block; font-size: 0.875rem; font-weight: 500; color: var(--text-muted); margin-bottom: 0.5rem; }
.form-group input, .form-group select, .form-group textarea { width: 100%; padding: 0.625rem; border: 1px solid var(--border-color); border-radius: 8px; font-size: 0.95rem; transition: var(--transition); background-color: #fff; }
.form-group input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1); }
.checkbox-group { display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 10px; margin-bottom: 1rem; }
.checkbox-item { position: relative; cursor: pointer; display: block; padding: 10px; background: #fff; border: 1px solid var(--border-color); border-radius: 8px; transition: var(--transition); text-align: center; font-size: 0.85rem; font-weight: 500; color: var(--text-muted); }
.checkbox-item input { position: absolute; opacity: 0; cursor: pointer; }
.checkbox-item:hover { border-color: var(--accent); color: var(--accent); }
.checkbox-item.active { background-color: var(--accent); color: white; border-color: var(--accent); box-shadow: 0 4px 10px rgba(59, 130, 246, 0.2); }
.table-container { overflow-x: auto; border: 1px solid var(--border-color); border-radius: 8px; }
table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
th { background-color: #F8FAFC; color: var(--text-muted); font-weight: 600; text-align: left; padding: 12px; border-bottom: 1px solid var(--border-color); }
td { padding: 12px; border-bottom: 1px solid #F1F5F9; }
tr:last-child td { border-bottom: none; }
tr:hover td { background-color: #FBFBFF; }
.auth-container { display: flex; justify-content: center; align-items: center; min-height: 80vh; }
.auth-card { background: white; padding: 2.5rem; border-radius: var(--radius); box-shadow: var(--shadow-md); width: 100%; max-width: 420px; border: 1px solid var(--border-color); }
.auth-card h2 { text-align: center; margin-bottom: 2rem; font-weight: 700; color: var(--primary); }
.alert { padding: 1rem; border-radius: 8px; margin-bottom: 1.5rem; font-size: 0.9rem; font-weight: 500; display: flex; align-items: center; gap: 10px; }
.alert-critical { background: #FEE2E2; color: #B91C1C; border: 1px solid #FCA5A5; }
.alert-warning { background: #FEF3C7; color: #B45309; border: 1px solid #FCD34D; }
.alert-success { background: #D1FAE5; color: #065F46; border: 1px solid #6EE7B7; }