:root {
    --primary: #1e3a5f;
    --primary-light: #2563eb;
    --primary-dark: #0f2744;
    --accent: #3b82f6;
    --success: #059669;
    --warning: #d97706;
    --danger: #dc2626;
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-500: #64748b;
    --gray-700: #334155;
    --gray-900: #0f172a;
    --white: #ffffff;
    --shadow: 0 1px 3px rgb(0 0 0 / 0.1);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --radius: 10px;
    --sidebar-width: 260px;
    --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
    font-family: var(--font);
    background: var(--gray-50);
    color: var(--gray-900);
    line-height: 1.5;
    min-height: 100vh;
}

a { color: var(--primary-light); text-decoration: none; }

/* Layout */
.admin-layout {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: var(--sidebar-width);
    background: var(--primary-dark);
    color: var(--white);
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    overflow-y: auto;
    z-index: 50;
    transition: transform 0.3s;
}

.sidebar-brand {
    padding: 1.25rem;
    border-bottom: 1px solid rgba(255,255,255,0.1);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.sidebar-brand img {
    height: 40px;
    width: auto;
    display: block;
}

.sidebar-nav { padding: 1rem 0; }

.sidebar-nav a {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1.25rem;
    color: rgba(255,255,255,0.75);
    font-weight: 500;
    font-size: 0.9375rem;
    transition: all 0.2s;
    text-decoration: none;
}

.sidebar-nav a:hover,
.sidebar-nav a.active {
    background: rgba(255,255,255,0.1);
    color: var(--white);
}

.sidebar-nav a.active {
    border-left: 3px solid var(--accent);
}

.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    min-width: 0;
}

.topbar {
    background: var(--white);
    border-bottom: 1px solid var(--gray-200);
    padding: 0.875rem 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 40;
}

.topbar h1 {
    font-size: 1.25rem;
    color: var(--primary);
}

.topbar-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.page-content { padding: 1.5rem; }

/* Stats */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.stat-card {
    background: var(--white);
    border-radius: var(--radius);
    padding: 1.25rem;
    box-shadow: var(--shadow);
    border-left: 4px solid var(--primary-light);
}

.stat-card.warning { border-left-color: var(--warning); }
.stat-card.danger { border-left-color: var(--danger); }
.stat-card.success { border-left-color: var(--success); }

.stat-card .label {
    font-size: 0.8125rem;
    color: var(--gray-500);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.stat-card .value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary);
    margin-top: 0.25rem;
}

/* Cards & Tables */
.card {
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    overflow: hidden;
    margin-bottom: 1.5rem;
}

.card-header {
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.card-header h2 {
    font-size: 1.0625rem;
    color: var(--primary);
}

.card-body { padding: 1.25rem; }

.table-responsive { overflow-x: auto; }

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9375rem;
}

th, td {
    padding: 0.75rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--gray-200);
}

th {
    background: var(--gray-50);
    font-weight: 600;
    color: var(--gray-700);
    font-size: 0.8125rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

tr:hover td { background: var(--gray-50); }

/* Forms */
.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.25rem;
}

.form-group { margin-bottom: 1rem; }

.form-group label {
    display: block;
    font-weight: 600;
    font-size: 0.875rem;
    margin-bottom: 0.375rem;
    color: var(--gray-700);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.625rem 0.875rem;
    border: 1px solid var(--gray-300);
    border-radius: 8px;
    font-size: 0.9375rem;
    font-family: inherit;
    transition: border-color 0.2s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-light);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.form-group textarea { min-height: 100px; resize: vertical; }

.form-actions {
    display: flex;
    gap: 0.75rem;
    margin-top: 1.5rem;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.375rem;
    padding: 0.625rem 1.25rem;
    border: none;
    border-radius: 8px;
    font-size: 0.9375rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
}

.btn-primary { background: var(--primary-light); color: var(--white); }
.btn-primary:hover { background: var(--primary); text-decoration: none; }
.btn-secondary { background: var(--gray-200); color: var(--gray-700); }
.btn-secondary:hover { background: var(--gray-300); text-decoration: none; }
.btn-danger { background: var(--danger); color: var(--white); }
.btn-danger:hover { background: #b91c1c; text-decoration: none; }
.btn-sm { padding: 0.375rem 0.75rem; font-size: 0.8125rem; }

/* Badges */
.badge {
    display: inline-block;
    padding: 0.2rem 0.625rem;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 600;
}

.badge-active { background: #ecfdf5; color: var(--success); }
.badge-expired { background: #fef2f2; color: var(--danger); }
.badge-revoked { background: #f1f5f9; color: var(--gray-700); }
.badge-suspended { background: #fffbeb; color: var(--warning); }

/* Alerts */
.alert {
    padding: 0.875rem 1rem;
    border-radius: 8px;
    margin-bottom: 1rem;
    font-size: 0.9375rem;
}

.alert-success { background: #ecfdf5; color: var(--success); border: 1px solid #a7f3d0; }
.alert-error { background: #fef2f2; color: var(--danger); border: 1px solid #fecaca; }
.alert-info { background: #eff6ff; color: var(--primary-light); border: 1px solid #bfdbfe; }

/* Login */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    padding: 1.5rem;
}

.login-card {
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
    padding: 2rem;
    width: 100%;
    max-width: 420px;
}

.login-card .brand {
    text-align: center;
    margin-bottom: 1.5rem;
}

.login-card .brand img {
    height: 56px;
    width: auto;
    margin-bottom: 0.5rem;
}

.login-card h1 {
    font-size: 1.375rem;
    color: var(--primary);
    text-align: center;
    margin-bottom: 1.5rem;
}

.search-bar {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.search-bar input {
    flex: 1;
    min-width: 180px;
    padding: 0.5rem 0.875rem;
    border: 1px solid var(--gray-300);
    border-radius: 8px;
}

.actions-cell {
    display: flex;
    gap: 0.375rem;
    flex-wrap: wrap;
}

.expiring-soon td { background: #fffbeb !important; }

.mobile-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--primary);
}

@media (max-width: 992px) {
    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .main-content {
        margin-left: 0;
    }

    .mobile-toggle { display: block; }
}

@media (max-width: 576px) {
    .page-content { padding: 1rem; }
    .stats-grid { grid-template-columns: 1fr 1fr; }
}