:root {
    --primary: #00b4d8;
    --primary-dark: #0077b6;
    --success: #2ecc71;
    --danger: #e74c3c;
    --warning: #f39c12;
    --info: #3498db;
    --dark: #1a1a2e;
    --darker: #16162a;
    --light: #f8f9fa;
    --gray: #6c757d;
    --border: #2d2d44;
    --card-bg: #252540;
    --sidebar-bg: #1e1e36;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--dark);
    color: var(--light);
    min-height: 100vh;
}

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

/* Sidebar */
.sidebar {
    width: 260px;
    background: var(--sidebar-bg);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
}

.logo {
    padding: 16px 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-bottom: 1px solid var(--border);
}

.logo-img {
    width: 60%;
    max-width: 200px;
    height: auto;
}

.nav-links {
    list-style: none;
    padding: 16px 0;
    flex: 1;
}

.nav-links li {
    padding: 14px 24px;
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
    transition: all 0.3s;
    color: var(--gray);
}

.nav-links li:hover,
.nav-links li.active {
    background: rgba(0, 180, 216, 0.1);
    color: var(--primary);
    border-right: 3px solid var(--primary);
}

.nav-links li i {
    width: 24px;
    text-align: center;
}

.last-update {
    padding: 16px 24px;
    border-top: 1px solid var(--border);
    color: var(--gray);
}

.last-update span {
    display: block;
    color: var(--light);
    margin-top: 4px;
}

/* Main Content */
.main-content {
    flex: 1;
    margin-left: 260px;
    padding: 24px;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border);
}

.header h1 {
    font-size: 28px;
    font-weight: 600;
}

.actions {
    display: flex;
    gap: 12px;
}

/* Buttons */
.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s;
}

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

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

.btn-secondary {
    background: var(--card-bg);
    color: var(--light);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background: var(--border);
}

/* Pages */
.page {
    display: none;
}

.page.active {
    display: block;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
    margin-bottom: 32px;
}

.stat-card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 16px;
    border: 1px solid var(--border);
    transition: transform 0.3s;
}

.stat-card:hover {
    transform: translateY(-4px);
}

.stat-icon {
    width: 56px;
    height: 56px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
}

.stat-icon.schools { background: rgba(52, 152, 219, 0.2); color: var(--info); }
.stat-icon.total { background: rgba(155, 89, 182, 0.2); color: #9b59b6; }
.stat-icon.online { background: rgba(46, 204, 113, 0.2); color: var(--success); }
.stat-icon.offline { background: rgba(231, 76, 60, 0.2); color: var(--danger); }
.stat-icon.alert { background: rgba(243, 156, 18, 0.2); color: var(--warning); }
.stat-icon.unstable { background: rgba(231, 76, 60, 0.3); color: var(--danger); }
.stat-icon.repeater { background: rgba(155, 89, 182, 0.2); color: #9b59b6; }

.stat-info h3 {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 4px;
}

.stat-info p {
    color: var(--gray);
    font-size: 14px;
}

/* Sections */
.section {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 24px;
    margin-bottom: 24px;
    border: 1px solid var(--border);
}

.section h2 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

/* Schools Grid */
.schools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 16px;
}

.school-card {
    background: var(--dark);
    border-radius: 10px;
    padding: 16px;
    border: 1px solid var(--border);
    cursor: pointer;
    transition: all 0.3s;
}

.school-card:hover {
    border-color: var(--primary);
}

.school-card.critical {
    border-left: 4px solid var(--danger);
}

.school-card.warning {
    border-left: 4px solid var(--warning);
}

.school-card h3 {
    font-size: 16px;
    margin-bottom: 12px;
}

.school-card h3 span {
    color: var(--gray);
    font-size: 13px;
    font-weight: 400;
}

.school-stats {
    display: flex;
    gap: 16px;
}

.school-stat {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
}

.school-stat.online { color: var(--success); }
.school-stat.offline { color: var(--danger); }
.school-stat.unstable { color: var(--warning); }

/* Events List */
.events-list {
    max-height: 400px;
    overflow-y: auto;
}

.event-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 12px;
    border-bottom: 1px solid var(--border);
    transition: background 0.3s;
}

.event-item:hover {
    background: rgba(255,255,255,0.02);
}

.event-item:last-child {
    border-bottom: none;
}

.event-icon {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.event-icon.down { background: rgba(231, 76, 60, 0.2); color: var(--danger); }
.event-icon.up { background: rgba(46, 204, 113, 0.2); color: var(--success); }
.event-icon.unstable { background: rgba(243, 156, 18, 0.2); color: var(--warning); }

.event-content {
    flex: 1;
}

.event-content p {
    font-size: 14px;
    margin-bottom: 4px;
}

.event-content small {
    color: var(--gray);
    font-size: 12px;
}

/* Tables */
.schools-table-container,
.aps-table-container {
    overflow-x: auto;
}

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

thead {
    background: var(--dark);
}

th, td {
    padding: 14px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

th {
    font-weight: 600;
    font-size: 13px;
    text-transform: uppercase;
    color: var(--gray);
    letter-spacing: 0.5px;
}

tbody tr:hover {
    background: rgba(255,255,255,0.02);
}

/* Status Badges */
.status-badge {
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.status-badge::before {
    content: '';
    width: 8px;
    height: 8px;
    border-radius: 50%;
}

.status-badge.online {
    background: rgba(46, 204, 113, 0.15);
    color: var(--success);
}

.status-badge.online::before {
    background: var(--success);
}

.status-badge.offline {
    background: rgba(231, 76, 60, 0.15);
    color: var(--danger);
}

.status-badge.offline::before {
    background: var(--danger);
}

.status-badge.alerting,
.status-badge.dormant {
    background: rgba(243, 156, 18, 0.15);
    color: var(--warning);
}

.status-badge.alerting::before,
.status-badge.dormant::before {
    background: var(--warning);
}

/* Search & Filters */
.search-bar {
    position: relative;
    margin-bottom: 20px;
}

.search-bar i {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--gray);
}

.search-bar input {
    width: 100%;
    padding: 12px 16px 12px 44px;
    background: var(--dark);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--light);
    font-size: 14px;
}

.search-bar input:focus {
    outline: none;
    border-color: var(--primary);
}

.filters {
    display: flex;
    gap: 12px;
    margin-bottom: 20px;
}

.filters select {
    padding: 10px 16px;
    background: var(--dark);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--light);
    font-size: 14px;
    cursor: pointer;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.8);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--card-bg);
    border-radius: 16px;
    width: 90%;
    max-width: 800px;
    max-height: 90vh;
    overflow: hidden;
    border: 1px solid var(--border);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 24px;
    border-bottom: 1px solid var(--border);
}

.modal-header h2 {
    font-size: 20px;
}

.close-btn {
    background: none;
    border: none;
    color: var(--gray);
    font-size: 28px;
    cursor: pointer;
    transition: color 0.3s;
}

.close-btn:hover {
    color: var(--light);
}

.modal-body {
    padding: 24px;
    max-height: 70vh;
    overflow-y: auto;
}

/* Info Grid */
.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.info-item {
    background: var(--dark);
    padding: 16px;
    border-radius: 8px;
}

.info-item label {
    display: block;
    color: var(--gray);
    font-size: 12px;
    text-transform: uppercase;
    margin-bottom: 6px;
}

.info-item span {
    font-size: 15px;
    font-weight: 500;
}

/* Unstable Badge */
.unstable-badge {
    background: rgba(231, 76, 60, 0.2);
    color: var(--danger);
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 11px;
    font-weight: 600;
    margin-left: 8px;
}

/* Repeater Badge */
.repeater-badge {
    background: rgba(155, 89, 182, 0.2);
    color: #9b59b6;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 11px;
    font-weight: 600;
    margin-left: 8px;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--dark);
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--gray);
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        width: 70px;
    }
    
    .sidebar .logo span,
    .sidebar .nav-links li span,
    .sidebar .last-update {
        display: none;
    }
    
    .main-content {
        margin-left: 70px;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}