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

:root {
    --primary-color: #4F46E5;
    --secondary-color: #10B981;
    --danger-color: #EF4444;
    --warning-color: #F59E0B;
    --dark-color: #1F2937;
    --light-color: #F3F4F6;
    --border-color: #E5E7EB;
    --text-color: #374151;
    --text-light: #6B7280;
    --success-color: #10B981;
    --info-color: #3B82F6;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--light-color);
}

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

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s;
    text-align: center;
}

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

.btn-primary:hover {
    background-color: #4338CA;
}

.btn-secondary {
    background-color: var(--text-light);
    color: white;
}

.btn-secondary:hover {
    background-color: #4B5563;
}

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

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

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

.btn-large {
    padding: 15px 30px;
    font-size: 16px;
}

.btn-small {
    padding: 6px 12px;
    font-size: 12px;
}

.btn-block {
    display: block;
    width: 100%;
}

.btn-icon {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 18px;
    padding: 5px;
}

/* Navbar */
.navbar {
    background: white;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand h2 {
    color: var(--primary-color);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
    align-items: center;
}

.nav-menu li a {
    color: var(--text-color);
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--dark-color);
    margin: 3px 0;
    display: block;
}

/* Hero Section */
.hero {
    padding: 80px 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
}

.hero-content h1 {
    font-size: 48px;
    margin-bottom: 20px;
}

.hero-content p {
    font-size: 20px;
    margin-bottom: 30px;
}

.hero-image img {
    width: 100%;
    border-radius: 12px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.2);
}

/* Features Section */
.features {
    padding: 80px 0;
    background: white;
}

.section-title {
    text-align: center;
    font-size: 36px;
    margin-bottom: 50px;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.feature-card {
    background: var(--light-color);
    padding: 30px;
    border-radius: 12px;
    text-align: center;
    transition: transform 0.3s;
}

.feature-card:hover {
    transform: translateY(-5px);
}

.feature-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.feature-card h3 {
    margin-bottom: 15px;
}

/* Testimonials */
.testimonials {
    padding: 80px 0;
    background: var(--light-color);
}

.testimonial-carousel {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.testimonial-card {
    display: none;
    background: white;
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.testimonial-card.active {
    display: block;
}

.testimonial-content {
    display: flex;
    gap: 20px;
    align-items: start;
}

.testimonial-avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
}

.testimonial-text p {
    font-size: 18px;
    margin-bottom: 20px;
    font-style: italic;
}

.testimonial-author strong {
    display: block;
}

.testimonial-author span {
    color: var(--text-light);
    font-size: 14px;
}

.carousel-controls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
    margin-top: 30px;
}

.carousel-btn {
    background: var(--primary-color);
    color: white;
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 20px;
}

.carousel-dots {
    display: flex;
    gap: 10px;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--border-color);
    cursor: pointer;
}

.dot.active {
    background: var(--primary-color);
}

/* Footer */
.footer {
    background: var(--dark-color);
    color: white;
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h3,
.footer-section h4 {
    margin-bottom: 15px;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 10px;
}

.footer-section a {
    color: rgba(255,255,255,0.8);
}

.social-icons {
    display: flex;
    gap: 15px;
    font-size: 24px;
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid rgba(255,255,255,0.1);
    color: rgba(255,255,255,0.6);
}

/* Auth Pages */
.auth-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.auth-container {
    width: 100%;
    max-width: 500px;
    padding: 20px;
}

.auth-box {
    background: white;
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
}

.auth-box h1 {
    margin-bottom: 30px;
    text-align: center;
}

.auth-form {
    margin-top: 20px;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 14px;
}

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

.form-links {
    display: flex;
    justify-content: space-between;
    margin-top: 20px;
    font-size: 14px;
}

.role-tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
}

.role-tab {
    flex: 1;
    padding: 10px;
    background: var(--light-color);
    border: 2px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
    font-weight: 500;
}

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

.info-notice {
    background: #FEF3C7;
    border-left: 4px solid var(--warning-color);
    padding: 12px;
    margin-bottom: 20px;
    border-radius: 4px;
    font-size: 14px;
}

.demo-credentials {
    margin-top: 20px;
    padding: 15px;
    background: var(--light-color);
    border-radius: 6px;
    font-size: 12px;
}

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

.sidebar {
    width: 260px;
    background: var(--dark-color);
    color: white;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
}

.sidebar-header {
    padding: 20px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.sidebar-header h2 {
    color: var(--primary-color);
}

.sidebar-nav {
    padding: 20px 0;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 20px;
    color: rgba(255,255,255,0.7);
    transition: all 0.3s;
}

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

.nav-icon {
    font-size: 20px;
}

.main-content {
    flex: 1;
    margin-left: 260px;
    background: var(--light-color);
}

.topbar {
    background: white;
    padding: 15px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    position: sticky;
    top: 0;
    z-index: 50;
}

.search-bar input {
    width: 400px;
    padding: 8px 15px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
}

.topbar-right {
    display: flex;
    align-items: center;
    gap: 20px;
    position: relative;
}

.notification-bell {
    position: relative;
    cursor: pointer;
    font-size: 24px;
}

.notification-badge {
    position: absolute;
    top: -5px;
    right: -5px;
    background: var(--danger-color);
    color: white;
    font-size: 10px;
    padding: 2px 6px;
    border-radius: 10px;
}

.user-menu {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
}

.avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
}

.avatar-small {
    width: 50px;
    height: 50px;
    border-radius: 50%;
}

.avatar-medium {
    width: 80px;
    height: 80px;
    border-radius: 50%;
}

.user-dropdown {
    display: none;
    position: absolute;
    top: 100%;
    right: 0;
    background: white;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    border-radius: 6px;
    margin-top: 10px;
    min-width: 150px;
}

.user-dropdown.active {
    display: block;
}

.user-dropdown a {
    display: block;
    padding: 10px 20px;
    color: var(--text-color);
}

.user-dropdown a:hover {
    background: var(--light-color);
}

.notification-panel {
    display: none;
    position: fixed;
    top: 60px;
    right: 20px;
    width: 350px;
    max-height: 500px;
    background: white;
    border-radius: 8px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.2);
    z-index: 1000;
}

.notification-panel.active {
    display: block;
}

.notification-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px;
    border-bottom: 1px solid var(--border-color);
}

.notification-header button {
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
}

.notification-list {
    max-height: 400px;
    overflow-y: auto;
}

.notification-item {
    display: flex;
    gap: 12px;
    padding: 15px;
    border-bottom: 1px solid var(--border-color);
}

.notification-icon {
    font-size: 24px;
}

.notification-content strong {
    display: block;
    margin-bottom: 5px;
}

.notification-content p {
    font-size: 14px;
    color: var(--text-light);
    margin-bottom: 5px;
}

.notification-time {
    font-size: 12px;
    color: var(--text-light);
}

.notification-empty {
    padding: 40px;
    text-align: center;
    color: var(--text-light);
}

.dashboard-content {
    padding: 30px;
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

.role-badge {
    display: inline-block;
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 500;
}

.badge-student {
    background: #DBEAFE;
    color: #1E40AF;
}

.badge-mentor {
    background: #D1FAE5;
    color: #065F46;
}

.badge-instructor {
    background: #FEF3C7;
    color: #92400E;
}

.badge-admin {
    background: #FCE7F3;
    color: #9F1239;
}

/* Overview Cards */
.overview-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: white;
    padding: 25px;
    border-radius: 12px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    display: flex;
    gap: 20px;
    align-items: center;
}

.stat-icon {
    width: 60px;
    height: 60px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 30px;
}

.stat-icon.blue {
    background: #DBEAFE;
}

.stat-icon.green {
    background: #D1FAE5;
}

.stat-icon.purple {
    background: #E9D5FF;
}

.stat-icon.orange {
    background: #FED7AA;
}

.stat-icon.yellow {
    background: #FEF3C7;
}

.stat-content h3 {
    font-size: 28px;
    margin-bottom: 5px;
}

.stat-content p {
    color: var(--text-light);
    font-size: 14px;
}

/* Quick Actions */
.quick-actions {
    background: white;
    padding: 25px;
    border-radius: 12px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    margin-bottom: 30px;
}

.quick-actions h2 {
    margin-bottom: 20px;
}

.action-buttons {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

/* Activity Feed & Lists */
.activity-feed,
.mentee-list,
.groups-section,
.announcements-section,
.forum-topics,
.upcoming-schedule {
    background: white;
    padding: 25px;
    border-radius: 12px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    margin-bottom: 30px;
}

.activity-list,
.mentee-grid,
.groups-grid,
.announcements-list,
.topics-list,
.schedule-list {
    margin-top: 20px;
}

.activity-item,
.announcement-item,
.topic-item {
    display: flex;
    gap: 15px;
    padding: 15px;
    border-bottom: 1px solid var(--border-color);
}

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

.activity-icon {
    font-size: 24px;
}

.activity-message,
.topic-item p {
    color: var(--text-light);
    font-size: 14px;
    margin: 5px 0;
}

.activity-time,
.notification-time,
.topic-meta {
    font-size: 12px;
    color: var(--text-light);
}

.topic-meta {
    display: flex;
    gap: 15px;
    margin-top: 10px;
}

/* Groups */
.groups-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

.group-card {
    background: white;
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.group-card h3,
.group-card h4 {
    margin-bottom: 10px;
}

.group-subject {
    color: var(--primary-color);
    font-weight: 500;
    margin-bottom: 10px;
}

.group-description,
.group-desc {
    color: var(--text-light);
    font-size: 14px;
    margin-bottom: 15px;
}

.group-meta,
.group-stats {
    display: flex;
    gap: 15px;
    font-size: 12px;
    color: var(--text-light);
    margin-bottom: 15px;
}

.group-actions {
    display: flex;
    gap: 10px;
}

/* Mentees */
.mentee-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 20px;
}

.mentee-card {
    background: white;
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    text-align: center;
}

.mentee-card img {
    margin-bottom: 15px;
}

.mentee-card h4 {
    margin-bottom: 10px;
}

.mentee-card p {
    font-size: 14px;
    color: var(--text-light);
    margin-bottom: 15px;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--light-color);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 5px;
}

.progress-fill {
    height: 100%;
    background: var(--success-color);
    transition: width 0.3s;
}

.progress-text {
    font-size: 12px;
    color: var(--text-light);
    margin-bottom: 15px;
}

/* Requests */
.request-card {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px;
    background: var(--light-color);
    border-radius: 8px;
    margin-bottom: 15px;
}

.request-info {
    display: flex;
    gap: 15px;
    align-items: start;
}

.request-actions {
    display: flex;
    gap: 10px;
}

.request-time {
    font-size: 12px;
    color: var(--text-light);
}

/* Schedule */
.schedule-item {
    display: flex;
    gap: 15px;
    padding: 15px;
    background: var(--light-color);
    border-radius: 8px;
    margin-bottom: 15px;
    border-left: 4px solid var(--primary-color);
}

.schedule-item.type-blue {
    border-left-color: #3B82F6;
}

.schedule-item.type-green {
    border-left-color: var(--success-color);
}

.schedule-item.type-yellow {
    border-left-color: var(--warning-color);
}

.schedule-date {
    text-align: center;
    min-width: 60px;
}

.schedule-date .day {
    display: block;
    font-size: 24px;
    font-weight: bold;
}

.schedule-date .month {
    display: block;
    font-size: 12px;
    color: var(--text-light);
}

.schedule-details h4 {
    margin-bottom: 5px;
}

.schedule-details p {
    font-size: 14px;
    color: var(--text-light);
    margin-bottom: 5px;
}

.schedule-time {
    font-size: 12px;
    color: var(--primary-color);
    font-weight: 500;
}

/* Tabs */
.tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
    border-bottom: 2px solid var(--border-color);
}

.tab {
    padding: 12px 24px;
    background: none;
    border: none;
    border-bottom: 3px solid transparent;
    cursor: pointer;
    font-weight: 500;
    color: var(--text-light);
}

.tab.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-light);
}

/* Alerts */
.alert {
    padding: 15px;
    border-radius: 6px;
    margin-bottom: 20px;
}

.alert-success {
    background: #D1FAE5;
    color: #065F46;
    border-left: 4px solid var(--success-color);
}

.alert-error {
    background: #FEE2E2;
    color: #991B1B;
    border-left: 4px solid var(--danger-color);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: white;
    border-radius: 12px;
    max-width: 600px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
}

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

.modal-header h2 {
    margin: 0;
}

.close-modal {
    background: none;
    border: none;
    font-size: 32px;
    cursor: pointer;
    line-height: 1;
}

.modal form {
    padding: 20px;
}

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

/* Data Table */
.data-table {
    width: 100%;
    border-collapse: collapse;
    background: white;
}

.data-table thead {
    background: var(--light-color);
}

.data-table th,
.data-table td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.data-table th {
    font-weight: 600;
}

.badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 500;
}

.badge-success {
    background: #D1FAE5;
    color: #065F46;
}

.badge-error {
    background: #FEE2E2;
    color: #991B1B;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .sidebar {
        width: 200px;
    }

    .main-content {
        margin-left: 200px;
    }

    .search-bar input {
        width: 250px;
    }
}

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        transition: transform 0.3s;
    }

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

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

    .hero .container {
        grid-template-columns: 1fr;
    }

    .hero-content h1 {
        font-size: 32px;
    }

    .nav-menu {
        display: none;
    }

    .mobile-menu-toggle {
        display: flex;
    }

    .overview-cards {
        grid-template-columns: 1fr;
    }

    .search-bar input {
        width: 150px;
    }

    .topbar {
        padding: 15px;
    }

    .action-buttons {
        flex-direction: column;
    }

    .action-buttons .btn {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .testimonial-content {
        flex-direction: column;
    }

    .user-menu span {
        display: none;
    }

    .groups-grid,
    .mentee-grid {
        grid-template-columns: 1fr;
    }
}