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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background: #f8fafc;
    min-height: 100vh;
}

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

/* Header */
.header {
    background: white;
    padding: 1rem 0;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

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

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

.logo-icon {
    font-size: 2rem;
}

.logo h1 {
    color: #667eea;
    font-size: 1.8rem;
    font-weight: 700;
}

.nav {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.nav-link {
    color: #666;
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    transition: all 0.3s ease;
}

.nav-link:hover,
.nav-link.active {
    color: #667eea;
    background: rgba(102, 126, 234, 0.1);
}

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-block;
    text-align: center;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: #6c757d;
    color: white;
}

.btn-secondary:hover {
    background: #5a6268;
}

.btn-outline {
    background: transparent;
    color: #667eea;
    border: 2px solid #667eea;
}

.btn-outline:hover {
    background: #667eea;
    color: white;
}

.btn-full {
    width: 100%;
}

/* Main Content */
.main {
    padding: 2rem 0;
}

/* Mentor Header */
.mentor-header {
    text-align: center;
    margin-bottom: 3rem;
}

.mentor-header h2 {
    font-size: 2.5rem;
    color: #333;
    margin-bottom: 0.5rem;
}

.mentor-header p {
    color: #666;
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}

/* Mentor Request */
.mentor-request {
    margin-bottom: 3rem;
}

.request-card {
    background: white;
    border-radius: 15px;
    padding: 2rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    max-width: 800px;
    margin: 0 auto;
}

.request-card h3 {
    font-size: 1.8rem;
    color: #333;
    margin-bottom: 2rem;
    text-align: center;
}

.mentor-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

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

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    margin-bottom: 0.5rem;
    color: #333;
    font-weight: 600;
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 0.75rem;
    border: 2px solid #e1e5e9;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #667eea;
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

/* Mentor Status */
.mentor-status {
    margin-bottom: 3rem;
}

.mentor-availability {
    margin-bottom: 3rem;
    background: white;
    border-radius: 15px;
    padding: 1.5rem;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.08);
}

.availability-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 1rem;
}

.availability-controls {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.availability-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1rem;
}

.availability-day {
    border: 1px solid #e1e5e9;
    border-radius: 12px;
    padding: 0.75rem;
    background: #f9fafb;
}

.day-label {
    font-weight: 700;
    color: #333;
    margin-bottom: 0.5rem;
}

.slot-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.slot-btn {
    padding: 0.5rem 0.75rem;
    border-radius: 10px;
    border: 1px solid #cbd5e1;
    background: white;
    cursor: pointer;
    transition: all 0.2s ease;
}

.slot-btn:hover {
    background: #eef2ff;
    border-color: #667eea;
    color: #4f46e5;
}

.slot-btn.selected {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-color: transparent;
}

.selected-slot {
    margin-top: 1rem;
    color: #333;
    font-weight: 600;
}

.mentor-status h3 {
    font-size: 1.8rem;
    color: #333;
    margin-bottom: 1.5rem;
}

.requests-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.request-item {
    background: white;
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    border-left: 4px solid #667eea;
}

.request-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.request-subject {
    font-size: 1.2rem;
    font-weight: 600;
    color: #333;
}

.request-status {
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

.request-status.pending {
    background: rgba(255, 193, 7, 0.1);
    color: #ffc107;
}

.request-status.approved {
    background: rgba(34, 197, 94, 0.1);
    color: #22c55e;
}

.request-status.rejected {
    background: rgba(239, 68, 68, 0.1);
    color: #ef4444;
}

.request-details {
    color: #666;
    margin-bottom: 1rem;
}

.request-actions {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

/* Available Mentors */
.available-mentors h3 {
    font-size: 1.8rem;
    color: #333;
    margin-bottom: 1.5rem;
}

.mentors-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.mentor-card {
    background: white;
    border-radius: 15px;
    padding: 2rem;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    text-align: center;
    transition: all 0.3s ease;
}

.mentor-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.mentor-avatar {
    font-size: 4rem;
    margin-bottom: 1rem;
}

.mentor-card h4 {
    font-size: 1.3rem;
    color: #333;
    margin-bottom: 0.5rem;
}

.mentor-subject {
    color: #667eea;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.mentor-experience {
    color: #666;
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.mentor-rating {
    margin-bottom: 1.5rem;
    font-size: 1.2rem;
}

.mentor-card .btn {
    width: 100%;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 3rem;
    color: #666;
}

.empty-state-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

.empty-state h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: #333;
}

.empty-state p {
    margin-bottom: 2rem;
}

/* Dark Theme */
.theme-dark .mentor-header h2 {
    color: #e2e8f0;
}

.theme-dark .mentor-header p {
    color: #94a3b8;
}

.theme-dark .request-card h3 {
    color: #e2e8f0;
}

.theme-dark .form-group label {
    color: #e2e8f0;
}

.theme-dark .mentor-status h3 {
    color: #e2e8f0;
}

.theme-dark .request-subject {
    color: #e2e8f0;
}

.theme-dark .request-details {
    color: #cbd5e1;
}

.theme-dark .request-details p {
    color: #cbd5e1;
}

.theme-dark .request-details strong {
    color: #e2e8f0;
}

.theme-dark .empty-state {
    color: #94a3b8;
}

.theme-dark .empty-state h3 {
    color: #e2e8f0;
}

.theme-dark .available-mentors h3 {
    color: #e2e8f0;
}

.theme-dark .mentor-card h4 {
    color: #e2e8f0;
}

.theme-dark .mentor-experience {
    color: #94a3b8;
}

/* Calendar/Availability Dark Mode */
.theme-dark .mentor-availability {
    background: #111827;
    border: 1px solid #1f2937;
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.35);
}

.theme-dark .availability-header h3 {
    color: #e2e8f0;
}

.theme-dark .availability-header p {
    color: #94a3b8;
}

.theme-dark .availability-controls label {
    color: #e2e8f0;
}

.theme-dark .availability-day {
    background: #0f172a;
    border-color: #1f2937;
}

.theme-dark .day-label {
    color: #e2e8f0;
}

.theme-dark .slot-btn {
    background: #1f2937;
    border-color: #374151;
    color: #e2e8f0;
}

.theme-dark .slot-btn:hover {
    background: rgba(102, 126, 234, 0.2);
    border-color: #667eea;
    color: #a5b4fc;
}

.theme-dark .slot-btn.selected {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-color: transparent;
}

.theme-dark .selected-slot {
    color: #e2e8f0;
}

/* Responsive */
@media (max-width: 768px) {
    .header .container {
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .mentor-header h2 {
        font-size: 2rem;
    }
    
    .request-card {
        padding: 1.5rem;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .request-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .request-actions {
        width: 100%;
        justify-content: flex-start;
    }
    
    .mentors-grid {
        grid-template-columns: 1fr;
    }
}