/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: #f8f9fa;
    color: #333;
    line-height: 1.6;
}

/* Loading Screen */
.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

.loading-content {
    text-align: center;
    color: white;
}

.loading-logo {
    margin-bottom: 30px;
}

.loading-logo i {
    font-size: 48px;
    margin-bottom: 10px;
    display: block;
}

.loading-logo h1 {
    font-size: 32px;
    font-weight: 700;
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top: 3px solid white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Login Screen */
.login-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9998;
}

.login-container {
    background: white;
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    text-align: center;
    max-width: 400px;
    width: 90%;
}

.login-header {
    margin-bottom: 30px;
}

.login-logo {
    margin-bottom: 10px;
}

.login-logo i {
    font-size: 48px;
    color: #2c3e50;
    margin-bottom: 10px;
    display: block;
}

.login-logo h1 {
    font-size: 28px;
    font-weight: 700;
    color: #333;
}

.login-subtitle {
    color: #666;
    font-size: 16px;
}

.google-signin-btn {
    background: #4285f4;
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 500;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    width: 100%;
    transition: background 0.3s ease;
}

.google-signin-btn:hover {
    background: #3367d6;
}

.google-signin-btn img {
    width: 20px;
    height: 20px;
}

.login-note {
    margin-top: 20px;
    color: #666;
    font-size: 14px;
}

/* Admin Panel Layout */
.admin-panel {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
.admin-header {
    background: #2c3e50;
    color: white;
    padding: 20px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.header-left {
    display: flex;
    align-items: center;
    gap: 30px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo i {
    font-size: 24px;
    color: #3498db;
}

.logo h1 {
    font-size: 24px;
    font-weight: 700;
}

.breadcrumb {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    color: #bdc3c7;
}

.header-right {
    display: flex;
    align-items: center;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 12px;
}

#userAvatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: cover;
}

.user-details {
    display: flex;
    flex-direction: column;
}

.user-details span:first-child {
    font-weight: 600;
    color: white;
}

.user-details span:last-child {
    font-size: 12px;
    color: #bdc3c7;
}

.logout-btn {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: 8px 12px;
    border-radius: 6px;
    cursor: pointer;
    color: white;
    transition: all 0.3s ease;
}

.logout-btn:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* Navigation */
.admin-nav {
    background: white;
    border-bottom: 1px solid #e9ecef;
    padding: 0 30px;
}

.nav-tabs {
    display: flex;
    gap: 0;
}

.nav-tab {
    background: none;
    border: none;
    padding: 16px 24px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    font-weight: 500;
    color: #666;
    border-bottom: 3px solid transparent;
    transition: all 0.3s ease;
}

.nav-tab:hover {
    background: #f8f9fa;
    color: #333;
}

.nav-tab.active {
    color: #2c3e50;
    border-bottom-color: #3498db;
    background: #f8f9fa;
}

.nav-tab i {
    font-size: 16px;
}

/* Main Content */
.admin-content {
    flex: 1;
    padding: 30px;
    overflow-y: auto;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* Overview Tab */
.overview-header {
    margin-bottom: 30px;
}

.overview-header h2 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 20px;
    color: #2c3e50;
}

.overview-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    display: flex;
    align-items: center;
    gap: 15px;
}

.stat-icon {
    width: 50px;
    height: 50px;
    border-radius: 8px;
    background: linear-gradient(135deg, #3498db 0%, #2980b9 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 20px;
}

.stat-info {
    display: flex;
    flex-direction: column;
}

.stat-number {
    font-size: 24px;
    font-weight: 700;
    color: #2c3e50;
}

.stat-label {
    font-size: 12px;
    color: #666;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.overview-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 30px;
}

.recent-activity,
.system-status {
    background: white;
    padding: 25px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.recent-activity h3,
.system-status h3 {
    font-size: 18px;
    font-weight: 600;
    color: #2c3e50;
    margin-bottom: 20px;
}

.activity-list {
    max-height: 300px;
    overflow-y: auto;
}

.activity-item {
    padding: 12px 0;
    border-bottom: 1px solid #f0f0f0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.activity-time {
    font-size: 11px;
    color: #999;
    min-width: 60px;
}

.activity-message {
    font-size: 13px;
    color: #333;
    flex: 1;
    margin-left: 10px;
}

.status-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.status-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 0;
}

.status-label {
    font-size: 14px;
    color: #333;
    font-weight: 500;
}

.status-value {
    font-size: 12px;
    font-weight: 600;
    padding: 4px 8px;
    border-radius: 4px;
}

.status-value.online {
    background: #d4edda;
    color: #155724;
}

.status-value.offline {
    background: #f8d7da;
    color: #721c24;
}

/* Management Tabs */
.districts-header,
.schools-header,
.teachers-header,
.users-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

.districts-header h2,
.schools-header h2,
.teachers-header h2,
.users-header h2 {
    font-size: 24px;
    font-weight: 600;
    color: #2c3e50;
}

.schools-controls,
.teachers-controls,
.users-controls {
    display: flex;
    gap: 15px;
    align-items: center;
}

.district-filter,
.school-filter,
.user-type-filter {
    padding: 8px 12px;
    border: 1px solid #ddd;
    border-radius: 6px;
    font-size: 14px;
    min-width: 150px;
}

.add-district-btn,
.add-school-btn,
.add-teacher-btn,
.add-user-btn {
    background: #27ae60;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: background 0.3s ease;
}

.add-district-btn:hover,
.add-school-btn:hover,
.add-teacher-btn:hover,
.add-user-btn:hover {
    background: #229954;
}

/* Lists */
.districts-list,
.schools-list,
.teachers-list,
.users-list {
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    overflow: hidden;
}

.list-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 15px 20px;
    border-bottom: 1px solid #f0f0f0;
    transition: background 0.3s ease;
}

.list-item:hover {
    background: #f8f9fa;
}

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

.item-info {
    display: flex;
    align-items: center;
    gap: 15px;
}

.item-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: #3498db;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
    font-size: 14px;
}

.item-details {
    display: flex;
    flex-direction: column;
}

.item-name {
    font-size: 14px;
    font-weight: 600;
    color: #2c3e50;
}

.item-meta {
    font-size: 12px;
    color: #666;
}

.item-actions {
    display: flex;
    gap: 8px;
}

.btn-edit,
.btn-delete {
    padding: 6px 12px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 12px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.btn-edit {
    background: #3498db;
    color: white;
}

.btn-edit:hover {
    background: #2980b9;
}

.btn-delete {
    background: #e74c3c;
    color: white;
}

.btn-delete:hover {
    background: #c0392b;
}

/* Settings Tab */
.settings-header {
    margin-bottom: 30px;
}

.settings-header h2 {
    font-size: 24px;
    font-weight: 600;
    color: #2c3e50;
}

.settings-content {
    background: white;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.settings-section {
    margin-bottom: 30px;
}

.settings-section h3 {
    font-size: 18px;
    font-weight: 600;
    color: #2c3e50;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid #f0f0f0;
}

.setting-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 15px 0;
    border-bottom: 1px solid #f0f0f0;
}

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

.setting-item label {
    font-size: 14px;
    font-weight: 500;
    color: #333;
    min-width: 200px;
}

.setting-item input,
.setting-item select {
    padding: 8px 12px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 14px;
    min-width: 200px;
}

.setting-item input[type="checkbox"] {
    min-width: auto;
    width: 18px;
    height: 18px;
}

.save-settings-btn {
    background: #27ae60;
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: background 0.3s ease;
}

.save-settings-btn:hover {
    background: #229954;
}

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

.modal {
    background: white;
    border-radius: 8px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
    max-width: 500px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
}

.modal-header {
    padding: 20px;
    border-bottom: 1px solid #e9ecef;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    font-size: 18px;
    font-weight: 600;
    color: #2c3e50;
}

.modal-close {
    background: none;
    border: none;
    cursor: pointer;
    color: #666;
    font-size: 18px;
    padding: 5px;
}

.modal-close:hover {
    color: #333;
}

.modal-content {
    padding: 20px;
}

/* Form Styles */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: #333;
    margin-bottom: 8px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 14px;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #3498db;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

.form-actions {
    display: flex;
    gap: 10px;
    justify-content: flex-end;
    margin-top: 20px;
}

.btn-primary,
.btn-secondary {
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: background 0.3s ease;
}

.btn-primary {
    background: #3498db;
    color: white;
}

.btn-primary:hover {
    background: #2980b9;
}

.btn-secondary {
    background: #95a5a6;
    color: white;
}

.btn-secondary:hover {
    background: #7f8c8d;
}

/* Empty State */
.empty-state {
    text-align: center;
    color: #666;
    font-style: italic;
    padding: 40px;
}

/* Responsive Design */
@media (max-width: 768px) {
    .admin-header {
        padding: 15px 20px;
        flex-direction: column;
        gap: 15px;
        align-items: flex-start;
    }

    .header-left {
        flex-direction: column;
        gap: 15px;
    }

    .admin-content {
        padding: 20px;
    }

    .overview-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .overview-stats {
        grid-template-columns: repeat(2, 1fr);
    }

    .nav-tabs {
        overflow-x: auto;
        padding-bottom: 5px;
    }

    .nav-tab {
        white-space: nowrap;
        min-width: 120px;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .schools-controls,
    .teachers-controls,
    .users-controls {
        flex-direction: column;
        align-items: stretch;
    }
}

@media (max-width: 480px) {
    .overview-stats {
        grid-template-columns: 1fr;
    }

    .settings-content {
        padding: 20px;
    }

    .setting-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }

    .setting-item input,
    .setting-item select {
        min-width: 100%;
    }
}