/* 
* 52-Week Business Training Platform
* Main Stylesheet
*/

:root {
    /* Color Palette */
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --secondary-color: #1e40af;
    --accent-color: #10b981;
    --accent-dark: #059669;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --info-color: #3b82f6;
    
    /* Grays */
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.375rem;
    --radius-lg: 0.5rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

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

body {
    font-family: var(--font-family);
    background-color: var(--gray-50);
    color: var(--gray-800);
    line-height: 1.6;
    font-size: 16px;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.2s;
}

a:hover {
    color: var(--primary-dark);
}

h1, h2, h3, h4, h5, h6 {
    color: var(--gray-900);
    font-weight: 700;
    line-height: 1.25;
    margin-bottom: var(--spacing-md);
}

h1 { font-size: 2.25rem; }
h2 { font-size: 1.875rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

p {
    margin-bottom: var(--spacing-md);
}

.text-muted { color: var(--gray-500); }
.text-success { color: var(--accent-color); }
.text-danger { color: var(--danger-color); }

/* Layout */
.container {
    width: 100%;
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--spacing-md);
    padding-right: var(--spacing-md);
}

@media (min-width: 640px) { .container { max-width: 640px; } }
@media (min-width: 768px) { .container { max-width: 768px; } }
@media (min-width: 1024px) { .container { max-width: 1024px; } }
@media (min-width: 1280px) { .container { max-width: 1280px; } }

.main-content {
    min-height: calc(100vh - 160px);
    padding-top: var(--spacing-xl);
    padding-bottom: var(--spacing-2xl);
}

.section {
    margin-bottom: var(--spacing-2xl);
}

/* Header & Navigation */
.site-header {
    background-color: white;
    border-bottom: 1px solid var(--gray-200);
    position: sticky;
    top: 0;
    z-index: 50;
    box-shadow: var(--shadow-sm);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo a {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--primary-color);
}

.main-nav {
    display: flex;
    align-items: center;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
}

.nav-menu a {
    color: var(--gray-600);
    font-weight: 500;
    padding: var(--spacing-sm) 0;
    border-bottom: 2px solid transparent;
}

.nav-menu a:hover, .nav-menu a.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--gray-600);
    cursor: pointer;
}

/* Footer */
.site-footer {
    background-color: white;
    border-top: 1px solid var(--gray-200);
    padding: var(--spacing-xl) 0;
    margin-top: auto;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
    text-align: center;
}

.footer-links {
    display: flex;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
    justify-content: center;
}

.footer-links a {
    color: var(--gray-500);
    font-size: 0.875rem;
}

.footer-links a:hover {
    color: var(--primary-color);
}

.footer-copyright {
    color: var(--gray-400);
    font-size: 0.875rem;
}

/* Cards */
.card, .stat-card, .course-card, .profile-card, .auth-card, .form-card, .admin-course-card {
    background-color: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--gray-200);
    overflow: hidden;
    transition: box-shadow 0.2s, transform 0.2s;
}

.course-card:hover, .admin-course-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: 0.625rem 1.25rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s;
    border: 1px solid transparent;
    font-size: 0.95rem;
}

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

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

.btn-outline {
    background-color: white;
    border-color: var(--gray-300);
    color: var(--gray-700);
}

.btn-outline:hover {
    background-color: var(--gray-50);
    border-color: var(--gray-400);
    color: var(--gray-900);
}

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

.btn-success:hover {
    background-color: var(--accent-dark);
}

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

.btn-danger:hover {
    background-color: #dc2626;
}

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

.btn-disabled {
    background-color: var(--gray-300);
    color: var(--gray-500);
    cursor: not-allowed;
}

.btn-sm {
    padding: 0.375rem 0.75rem;
    font-size: 0.875rem;
}

/* Forms */
.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
    color: var(--gray-700);
}

.form-group input, .form-group select, .form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 1rem;
    transition: border-color 0.2s;
}

.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group small {
    display: block;
    margin-top: var(--spacing-xs);
    color: var(--gray-500);
    font-size: 0.875rem;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
}

.form-group-inline {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
}

.disabled-input {
    background-color: var(--gray-100);
    color: var(--gray-500);
    cursor: not-allowed;
}

/* Authentication Pages */
.auth-page {
    display: flex;
    min-height: 100vh;
    align-items: center;
    justify-content: center;
    background-color: var(--gray-100);
    padding: var(--spacing-lg);
}

.auth-container {
    width: 100%;
    max-width: 480px;
}

.auth-card {
    padding: var(--spacing-2xl);
}

.auth-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.logo-large {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

.auth-footer {
    text-align: center;
    margin-top: var(--spacing-xl);
    font-size: 0.9rem;
    color: var(--gray-600);
}

/* Alerts */
.alert {
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.alert-error {
    background-color: #fee2e2;
    color: #b91c1c;
    border: 1px solid #fecaca;
}

.alert-success {
    background-color: #d1fae5;
    color: #047857;
    border: 1px solid #a7f3d0;
}

.alert-info {
    background-color: #dbeafe;
    color: #1e40af;
    border: 1px solid #bfdbfe;
}

/* Dashboard */
.dashboard-header {
    margin-bottom: var(--spacing-xl);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.stats-grid-4 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
}

.stat-card {
    padding: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-full);
    background-color: #eff6ff;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.stat-icon-warning { background-color: #fef3c7; color: var(--warning-color); }
.stat-icon-success { background-color: #d1fae5; color: var(--accent-color); }
.stat-icon-info { background-color: #dbeafe; color: var(--info-color); }

.stat-content h3 {
    margin-bottom: 0;
    font-size: 1.8rem;
}

.stat-content p {
    margin-bottom: 0;
    color: var(--gray-500);
    font-size: 0.9rem;
}

/* Courses */
.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

.course-thumbnail img {
    width: 100%;
    height: 180px;
    object-fit: cover;
}

.course-content {
    padding: var(--spacing-lg);
}

.course-description {
    color: var(--gray-600);
    font-size: 0.95rem;
    margin-bottom: var(--spacing-lg);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.course-meta {
    display: flex;
    gap: var(--spacing-md);
    color: var(--gray-500);
    font-size: 0.875rem;
    margin-bottom: var(--spacing-lg);
}

.course-meta i {
    margin-right: var(--spacing-xs);
}

.course-actions {
    display: flex;
    gap: var(--spacing-sm);
}

/* Progress Bars */
.progress-section {
    margin-bottom: var(--spacing-lg);
}

.progress-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--spacing-xs);
    font-size: 0.875rem;
    font-weight: 500;
}

.progress-percentage {
    color: var(--primary-color);
}

.progress-bar {
    height: 8px;
    background-color: var(--gray-200);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-bottom: var(--spacing-xs);
}

.progress-fill {
    height: 100%;
    background-color: var(--accent-color);
    border-radius: var(--radius-full);
    transition: width 0.5s ease-out;
}

.progress-text {
    font-size: 0.8rem;
    color: var(--gray-500);
    margin-bottom: 0;
}

.progress-bar-large {
    height: 12px;
}

.progress-percentage-large {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
}

/* Breadcrumbs */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
    margin-bottom: var(--spacing-lg);
    font-size: 0.9rem;
    color: var(--gray-500);
}

.breadcrumb a {
    color: var(--gray-600);
}

.breadcrumb a:hover {
    color: var(--primary-color);
}

/* Course Overview */
.topics-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.topic-item {
    background-color: white;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
}

.topic-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.topic-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.topic-title h3 {
    margin-bottom: 0;
    font-size: 1.125rem;
}

.status-icon-completed { color: var(--accent-color); }
.status-icon-available { color: var(--primary-color); }
.status-icon-locked { color: var(--gray-400); }

.topic-locked {
    background-color: var(--gray-50);
}

.topic-locked .topic-title h3 {
    color: var(--gray-500);
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.badge-success { background-color: #d1fae5; color: #065f46; }
.badge-warning { background-color: #fef3c7; color: #92400e; }
.badge-info { background-color: #dbeafe; color: #1e40af; }
.badge-locked { background-color: #f3f4f6; color: #6b7280; }

.lessons-list {
    margin-top: var(--spacing-md);
    border-top: 1px solid var(--gray-100);
    padding-top: var(--spacing-md);
}

.lesson-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-sm) 0;
    color: var(--gray-700);
    transition: color 0.1s;
}

.lesson-link:hover {
    color: var(--primary-color);
}

.lesson-link:hover .text-muted {
    color: var(--primary-color);
}

.lesson-link span {
    flex-grow: 1;
}

/* Lesson Page */
.lesson-header {
    margin-bottom: var(--spacing-xl);
    border-bottom: 1px solid var(--gray-200);
    padding-bottom: var(--spacing-lg);
}

.week-badge {
    color: var(--primary-color);
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.9rem;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-xs);
    display: block;
}

.lesson-actions {
    display: flex;
    justify-content: center;
    margin: var(--spacing-2xl) 0;
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

.completion-message {
    background-color: #ecfdf5;
    color: #047857;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    font-weight: 500;
}

.lesson-navigation {
    display: flex;
    justify-content: space-between;
    margin-top: var(--spacing-2xl);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--gray-200);
}

/* Video Section */
.videos-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.video-wrapper {
    position: relative;
    padding-bottom: 56.25%; /* 16:9 Aspect Ratio */
    height: 0;
    overflow: hidden;
    background-color: black;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
}

.video-wrapper iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

/* Attachments */
.attachments-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-md);
}

.attachment-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    background-color: white;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    color: var(--gray-800);
    transition: all 0.2s;
}

.attachment-item:hover {
    border-color: var(--primary-color);
    background-color: var(--gray-50);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.attachment-icon {
    font-size: 2rem;
    color: var(--danger-color);
}

.attachment-info h4 {
    margin-bottom: 0;
    font-size: 1rem;
    word-break: break-word;
}

.attachment-info p {
    margin-bottom: 0;
    font-size: 0.8rem;
}

.attachment-action {
    margin-left: auto;
    color: var(--gray-400);
}

/* Profile */
.profile-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

.profile-card {
    padding: var(--spacing-xl);
}

/* Admin Styles */
.admin-header {
    background: linear-gradient(135deg, var(--gray-800) 0%, var(--gray-900) 100%);
    color: white;
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-xl);
}

.admin-header h1 {
    color: white;
}

.admin-header .text-muted {
    color: var(--gray-400);
}

.quick-actions {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-md);
}

.action-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: var(--spacing-lg);
    background-color: white;
    border-radius: var(--radius-md);
    border: 1px solid var(--gray-200);
    color: var(--gray-700);
    transition: all 0.2s;
}

.action-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
    color: var(--primary-color);
}

.action-card i {
    font-size: 2rem;
    margin-bottom: var(--spacing-md);
    color: var(--primary-color);
}

.action-card h3 {
    font-size: 1rem;
    margin-bottom: var(--spacing-xs);
    color: inherit;
}

.action-card p {
    font-size: 0.8rem;
    color: var(--gray-500);
    margin-bottom: 0;
}

.courses-admin-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
}

.admin-course-card {
    padding: var(--spacing-lg);
}

.course-stats {
    display: flex;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md);
    background-color: var(--gray-50);
    border-radius: var(--radius-md);
}

.course-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

/* Tables */
.table-responsive {
    overflow-x: auto;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    background-color: white;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.data-table th, .data-table td {
    padding: var(--spacing-md);
    text-align: left;
    border-bottom: 1px solid var(--gray-200);
}

.data-table th {
    background-color: var(--gray-50);
    font-weight: 600;
    color: var(--gray-700);
}

.data-table tr:last-child td {
    border-bottom: none;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .header-content {
        flex-wrap: wrap;
    }
    
    .mobile-menu-toggle {
        display: block;
    }
    
    .nav-menu {
        display: none;
        width: 100%;
        flex-direction: column;
        gap: 0;
        position: absolute;
        top: 70px;
        left: 0;
        background-color: white;
        border-bottom: 1px solid var(--gray-200);
        padding: var(--spacing-md) 0;
        box-shadow: var(--shadow-md);
    }
    
    .nav-menu.show {
        display: flex;
    }
    
    .nav-menu li {
        width: 100%;
    }
    
    .nav-menu a {
        display: block;
        padding: var(--spacing-md) var(--spacing-xl);
        border-left: 4px solid transparent;
        border-bottom: none;
    }
    
    .nav-menu a:hover, .nav-menu a.active {
        background-color: var(--gray-50);
        border-left-color: var(--primary-color);
        border-bottom: none;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .lesson-navigation {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .nav-prev, .nav-next, .lesson-navigation .btn {
        width: 100%;
        justify-content: center;
    }
    
    .nav-next {
        order: -1; /* Next button on top in mobile */
    }
}