:root {
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary: #64748b;
    --bg-main: #f8fafc;
    --bg-card: #ffffff;
    --sidebar-bg: #0f172a;
    --sidebar-text: #94a3b8;
    --sidebar-active: #ffffff;
    --sidebar-active-bg: #1e293b;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --danger: #ef4444;
    --warning: #f59e0b;
    --success: #10b981;
    --radius: 12px;
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-main);
    color: var(--text-main);
    line-height: 1.5;
}

.app-layout {
    display: flex;
    min-height: 100vh;
}

/* SIDEBAR */
.sidebar {
    width: 260px;
    background-color: var(--sidebar-bg);
    color: var(--sidebar-text);
    padding: 24px 0;
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    z-index: 100;
}

.sidebar-brand {
    padding: 0 24px 32px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.brand-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary), #60a5fa);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.25rem;
}

.brand-name {
    display: block;
    font-weight: 700;
    color: white;
    font-size: 1.25rem;
    line-height: 1.2;
}

.brand-sub {
    display: block;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.sidebar-nav {
    flex: 1;
    padding: 0 12px;
}

.nav-section-label {
    padding: 24px 12px 8px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    color: var(--secondary);
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    text-decoration: none;
    color: var(--sidebar-text);
    border-radius: 8px;
    transition: all 0.2s;
    margin-bottom: 4px;
}

.nav-item:hover {
    background-color: var(--sidebar-active-bg);
    color: white;
}

.nav-item.active {
    background-color: var(--primary);
    color: white;
}

.nav-item i {
    width: 20px;
    text-align: center;
}

.sidebar-footer {
    padding: 24px;
    border-top: 1px solid #1e293b;
    font-size: 0.75rem;
}

/* MAIN CONTENT */
.main-content {
    flex: 1;
    margin-left: 260px;
    padding: 0;
}

.top-bar {
    height: 70px;
    background-color: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 32px;
    position: sticky;
    top: 0;
    z-index: 50;
}

.sidebar-toggle {
    display: none;
}

.topbar-title h1 {
    font-size: 1.5rem;
    font-weight: 700;
}

.topbar-badge {
    background-color: #f1f5f9;
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    color: var(--success);
    display: flex;
    align-items: center;
    gap: 6px;
}

/* PAGE CONTENT */
.page-content {
    padding: 32px;
}

.dashboard-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    margin-bottom: 32px;
}

.stat-card {
    background-color: var(--bg-card);
    padding: 24px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    gap: 20px;
}

.stat-icon {
    width: 56px;
    height: 56px;
    background-color: #eff6ff;
    color: var(--primary);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.stat-card.warning .stat-icon {
    background-color: #fffbeb;
    color: var(--warning);
}

.stat-info h3 {
    font-size: 1.75rem;
    font-weight: 800;
}

.stat-info p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.section-card {
    background-color: var(--bg-card);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 24px;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

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

.table {
    width: 100%;
    border-collapse: collapse;
}

.table th {
    text-align: left;
    padding: 12px;
    border-bottom: 2px solid var(--border-color);
    color: var(--text-muted);
    font-size: 0.85rem;
    text-transform: uppercase;
}

.table td {
    padding: 16px 12px;
    border-bottom: 1px solid var(--border-color);
}

.badge {
    padding: 4px 8px;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 600;
}

.badge-danger { background-color: #fee2e2; color: #b91c1c; }
.badge-warning { background-color: #fef3c7; color: #92400e; }

.btn {
    padding: 8px 16px;
    border-radius: 8px;
    border: none;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-primary {
    background-color: var(--primary);
    color: white;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
}

.btn-sm { padding: 4px 12px; font-size: 0.85rem; }

.btn-icon {
    background: none;
    border: none;
    color: var(--primary);
    cursor: pointer;
    font-size: 1.1rem;
}