/* ========================================
   AviGation LMS - Student & Teacher Portal
   ======================================== */

:root {
    --primary: #6C3CE1;
    --primary-dark: #5228CC;
    --primary-light: #8B5CF6;
    --secondary: #F59E0B;
    --accent-gold: #F59E0B;
    --success: #10B981;
    --danger: #EF4444;
    --warning: #F59E0B;
    --bg-dark: #0F172A;
    --bg-card: #1E293B;
    --bg-input: #334155;
    --text-primary: #F8FAFC;
    --text-secondary: #94A3B8;
    --border: #334155;
    --radius: 12px;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    min-height: 100vh;
}

/* Login/Register Container */
.auth-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    background: linear-gradient(135deg, var(--bg-dark) 0%, #1a1a2e 100%);
}

.auth-box {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 40px;
    width: 100%;
    max-width: 420px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
}

.auth-logo {
    text-align: center;
    margin-bottom: 30px;
}

.auth-logo h1 {
    font-size: 1.8rem;
    color: var(--text-primary);
}

.auth-logo span {
    color: var(--secondary);
}

.auth-logo p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: 5px;
}

.auth-tabs {
    display: flex;
    margin-bottom: 30px;
    background: var(--bg-input);
    border-radius: 8px;
    padding: 4px;
}

.auth-tab {
    flex: 1;
    padding: 12px;
    text-align: center;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    border-radius: 6px;
    transition: all 0.3s;
}

.auth-tab.active {
    background: var(--primary);
    color: white;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 14px 16px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 1rem;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary);
}

.form-group select option {
    background: var(--bg-card);
    color: var(--text-primary);
}

.btn {
    display: inline-block;
    padding: 14px 28px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
    text-align: center;
}

.btn-primary {
    background: var(--primary);
    color: white;
    width: 100%;
}

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

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

.btn-success:hover {
    background: #059669;
}

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

.btn-outline {
    background: transparent;
    border: 2px solid var(--primary);
    color: var(--primary);
}

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

.btn-sm {
    padding: 8px 16px;
    font-size: 0.85rem;
}

.auth-footer {
    text-align: center;
    margin-top: 20px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

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

.auth-footer a:hover {
    text-decoration: underline;
}

.error-message {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid var(--danger);
    color: var(--danger);
    padding: 12px;
    border-radius: 8px;
    margin-bottom: 20px;
    display: none;
}

.success-message {
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid var(--success);
    color: var(--success);
    padding: 12px;
    border-radius: 8px;
    margin-bottom: 20px;
    display: none;
}

/* Dashboard Styles */
.dashboard {
    min-height: 100vh;
}

.dashboard-header {
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    padding: 15px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
}

.dashboard-header .logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--text-primary);
}

.dashboard-header .logo-icon {
    width: 40px;
    height: 40px;
    background: var(--primary);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.1rem;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 20px;
}

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

.user-avatar {
    width: 36px;
    height: 36px;
    background: var(--primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.9rem;
}

.user-name {
    font-weight: 500;
}

.user-role {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.btn-logout {
    background: transparent;
    border: 1px solid var(--danger);
    color: var(--danger);
    padding: 8px 16px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.85rem;
}

.btn-logout:hover {
    background: var(--danger);
    color: white;
}

.dashboard-content {
    padding: 30px;
    max-width: 1200px;
    margin: 0 auto;
}

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

.welcome-section h2 {
    font-size: 1.6rem;
    margin-bottom: 5px;
}

.welcome-section p {
    color: var(--text-secondary);
}

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

.stat-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 24px;
    border: 1px solid var(--border);
}

.stat-card .stat-icon {
    width: 48px;
    height: 48px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 15px;
}

.stat-card .stat-icon.purple {
    background: rgba(108, 60, 225, 0.15);
}

.stat-card .stat-icon.green {
    background: rgba(16, 185, 129, 0.15);
}

.stat-card .stat-icon.gold {
    background: rgba(245, 158, 11, 0.15);
}

.stat-card .stat-icon.blue {
    background: rgba(59, 130, 246, 0.15);
}

.stat-card .stat-value {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 5px;
}

.stat-card .stat-label {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Cards Grid */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.card {
    background: var(--bg-card);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    overflow: hidden;
}

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

.card-header h3 {
    font-size: 1.1rem;
}

.card-body {
    padding: 20px;
}

.card-footer {
    padding: 15px 20px;
    border-top: 1px solid var(--border);
    background: rgba(0, 0, 0, 0.1);
}

/* Course Card */
.course-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    padding: 20px;
}

.course-card h4 {
    font-size: 1rem;
    margin-bottom: 10px;
}

.course-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 15px;
}

.course-meta {
    display: flex;
    gap: 15px;
    margin-bottom: 15px;
}

.course-meta span {
    font-size: 0.85rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 5px;
}

/* Class Schedule */
.class-item {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 15px;
    background: var(--bg-input);
    border-radius: 8px;
    margin-bottom: 10px;
}

.class-date {
    text-align: center;
    min-width: 50px;
}

.class-date .day {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-light);
}

.class-date .month {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
}

.class-info {
    flex: 1;
}

.class-info h4 {
    font-size: 0.95rem;
    margin-bottom: 3px;
}

.class-info p {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

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

/* Attendance Badge */
.attendance-badge {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
}

.attendance-badge.present {
    background: rgba(16, 185, 129, 0.15);
    color: var(--success);
}

.attendance-badge.absent {
    background: rgba(239, 68, 68, 0.15);
    color: var(--danger);
}

.attendance-badge.pending {
    background: rgba(245, 158, 11, 0.15);
    color: var(--warning);
}

/* Table */
.table-container {
    overflow-x: auto;
}

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

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

th {
    background: var(--bg-input);
    color: var(--text-secondary);
    font-size: 0.85rem;
    text-transform: uppercase;
    font-weight: 600;
}

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

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 20px;
}

.modal-overlay.active {
    display: flex;
}

.modal {
    background: var(--bg-card);
    border-radius: var(--radius);
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
}

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

.modal-header h3 {
    font-size: 1.2rem;
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
}

.modal-body {
    padding: 20px;
}

.modal-footer {
    padding: 15px 20px;
    border-top: 1px solid var(--border);
    display: flex;
    gap: 10px;
    justify-content: flex-end;
}

/* Tabs */
.tabs {
    display: flex;
    gap: 5px;
    margin-bottom: 20px;
    border-bottom: 1px solid var(--border);
    padding-bottom: 10px;
}

.tab {
    padding: 10px 20px;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 0.95rem;
    cursor: pointer;
    border-radius: 6px 6px 0 0;
    transition: all 0.3s;
}

.tab.active {
    color: var(--primary-light);
    border-bottom: 2px solid var(--primary);
}

.tab:hover {
    color: var(--text-primary);
}

/* Progress Bar */
.progress-bar {
    height: 8px;
    background: var(--bg-input);
    border-radius: 4px;
    overflow: hidden;
    margin-top: 10px;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--primary-light));
    border-radius: 4px;
    transition: width 0.3s;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-secondary);
}

.empty-state .icon {
    font-size: 3rem;
    margin-bottom: 15px;
}

.empty-state h3 {
    margin-bottom: 10px;
    color: var(--text-primary);
}

/* Loading Spinner */
.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 20px auto;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Responsive */
@media (max-width: 768px) {
    .dashboard-header {
        padding: 15px;
        flex-wrap: wrap;
        gap: 10px;
    }
    
    .header-right {
        width: 100%;
        justify-content: space-between;
    }
    
    .dashboard-content {
        padding: 20px 15px;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .cards-grid {
        grid-template-columns: 1fr;
    }
    
    .class-item {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .class-actions {
        width: 100%;
    }
    
    .class-actions .btn {
        flex: 1;
    }
}

/* Meet Link Button */
.btn-meet {
    background: #00897B;
    color: white;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.btn-meet:hover {
    background: #00796B;
}

/* Attendance Summary */
.attendance-summary {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 15px;
    margin-bottom: 20px;
}

.attendance-item {
    text-align: center;
    padding: 15px;
    background: var(--bg-input);
    border-radius: 8px;
}

.attendance-item .number {
    font-size: 1.8rem;
    font-weight: 700;
}

.attendance-item .label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 5px;
}

.attendance-item.present .number { color: var(--success); }
.attendance-item.absent .number { color: var(--danger); }
.attendance-item.total .number { color: var(--primary-light); }

/* Checkbox for attendance */
.attendance-checkbox {
    width: 20px;
    height: 20px;
    cursor: pointer;
    accent-color: var(--primary);
}