:root {
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary-color: #64748b;
    --background-color: #f8fafc;
    --card-bg: #ffffff;
    --text-primary: #0f172a;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --success-color: #059669;
    --error-color: #dc2626;
    --warning-color: #d97706;
    --sidebar-width: 280px;
    --header-height: 70px;
    --border-radius: 12px;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--background-color);
    color: var(--text-primary);
    line-height: 1.6;
}

/* Login Page Styles */
.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 20px;
}

.login-card {
    background: var(--card-bg);
    padding: 3rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 420px;
    animation: slideUp 0.5s ease-out;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.login-header {
    text-align: center;
    margin-bottom: 2rem;
}

.login-logo {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.login-subtitle {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.form-input {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    transition: all 0.2s ease;
    background: #fff;
}

.form-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgb(37 99 235 / 0.1);
}

.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
    text-align: center;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

.alert {
    padding: 0.75rem 1rem;
    border-radius: 8px;
    margin-bottom: 1rem;
    font-size: 0.9rem;
}

.alert-error {
    background: #fef2f2;
    border: 1px solid #fecaca;
    color: var(--error-color);
}

.alert-success {
    background: #f0fdf4;
    border: 1px solid #bbf7d0;
    color: var(--success-color);
}

.alert-warning {
    background: rgba(217, 119, 6, 0.1);
    color: var(--warning-color);
    border: 1px solid rgba(217, 119, 6, 0.2);
}

/* Badge styles */
.badge {
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

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

.badge-secondary {
    background: var(--secondary-color);
    color: white;
}

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

.sidebar {
    width: var(--sidebar-width);
    background: var(--card-bg);
    border-right: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    position: fixed;
    height: 100vh;
    overflow-y: auto;
    transition: transform 0.3s ease;
}

.sidebar-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    text-align: center;
}

.sidebar-logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.sidebar-nav {
    padding: 1rem 0;
}

/* Collapsed sidebar styles */
.sidebar.collapsed {
    transform: translateX(-100%);
    width: 0;
}

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

.main-body.sidebar-collapsed {
    padding-left: 2rem;
}

.nav-separator {
    margin: 1.5rem 0 0.5rem 0;
    padding: 0 1rem;
    border-top: 1px solid var(--border-color);
    padding-top: 1rem;
}

.nav-separator span {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    color: var(--text-secondary);
    letter-spacing: 0.05em;
}

.nav-item {
    margin-bottom: 0.25rem;
}

.nav-link {
    display: flex;
    align-items: center;
    padding: 0.75rem 1.5rem;
    color: var(--text-secondary);
    text-decoration: none;
    transition: all 0.2s ease;
    font-weight: 500;
}

.nav-link:hover {
    background: #f1f5f9;
    color: var(--primary-color);
    transform: translateX(4px);
}

.nav-link.active {
    background: #eff6ff;
    color: var(--primary-color);
    border-right: 3px solid var(--primary-color);
}

.nav-icon {
    width: 20px;
    height: 20px;
    margin-right: 0.75rem;
}

.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    min-height: 100vh;
}

.main-header {
    background: var(--card-bg);
    height: var(--header-height);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 2rem;
    box-shadow: var(--shadow-sm);
}

.page-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

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

.user-avatar {
    width: 40px;
    height: 40px;
    background: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
}

.main-body {
    padding: 2rem;
    max-width: 1200px;
}

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

.card-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    background: #f8fafc;
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.card-body {
    padding: 1.5rem;
}

.grid {
    display: grid;
    gap: 1.5rem;
}

.grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.grid-4 {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

/* Change Password Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 2rem;
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    animation: modalSlide 0.3s ease-out;
}

@keyframes modalSlide {
    from {
        opacity: 0;
        transform: scale(0.9) translateY(-20px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.modal-header {
    margin-bottom: 1.5rem;
    text-align: center;
}

.modal-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.btn-group {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
}

.btn-secondary {
    background: var(--secondary-color);
    color: white;
    flex: 1;
}

.btn-secondary:hover {
    background: #475569;
}

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

.btn-danger:hover {
    background: #b91c1c;
    transform: translateY(-1px);
}

.btn-link {
    background: var(--secondary-color);
    border: 1px solid var(--border-color);
    color: white;
    cursor: pointer;
    font-size: 0.8rem;
    padding: 0.4rem 0.8rem;
    border-radius: 6px;
    transition: all 0.2s ease;
    text-decoration: none;
    display: inline-block;
    font-weight: 400;
}

.btn-link:hover {
    background: #475569;
    border-color: #475569;
    text-decoration: none;
    transform: translateY(-1px);
}

/* Video Container */
.video-container {
    position: relative;
    padding-bottom: 56.25%;
    height: 0;
    overflow: hidden;
    border-radius: 8px;
    background: #000;
}

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

/* Course Lesson List */
.lesson-list {
    list-style: none;
    padding: 0;
}

.lesson-item {
    display: flex;
    align-items: center;
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    cursor: pointer;
    transition: all 0.2s ease;
}

.lesson-item:hover {
    background: #f8fafc;
}

.lesson-item.active {
    background: #eff6ff;
    border-left: 4px solid var(--primary-color);
}

.lesson-number {
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.875rem;
    font-weight: 600;
    margin-right: 1rem;
}

.lesson-title {
    font-weight: 500;
}

.module-header {
    padding: 1rem 1rem 0.5rem 1rem;
    background: #f1f5f9;
    color: var(--text-primary);
    font-size: 0.875rem;
    border-bottom: 1px solid var(--border-color);
    margin-top: 0.5rem;
}

.module-header:first-child {
    margin-top: 0;
}

/* Video preview in admin */
.video-preview {
    border-radius: 8px;
    overflow: hidden;
    border: 2px solid #e2e8f0;
    background: #f8fafc;
}

.video-preview iframe,
.video-preview wistia-player {
    max-width: 100%;
}

.edit-lesson-form {
    animation: slideDown 0.3s ease;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Admin lesson cards */
.card .btn-sm {
    font-size: 0.8rem;
    padding: 0.25rem 0.5rem;
}

/* Modern Edit Form Styles - Panel Consistent */
.modern-edit-form {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 2rem;
    margin-top: 1.5rem;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

.modern-edit-form::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--primary-color);
    border-radius: var(--border-radius) var(--border-radius) 0 0;
}

.modern-edit-form h6 {
    color: var(--text-primary);
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    padding-top: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.modern-form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.modern-form-grid .full-width {
    grid-column: 1 / -1;
}

.modern-form-group {
    position: relative;
    margin-bottom: 1.5rem;
}

.modern-form-label {
    display: block;
    color: var(--text-primary);
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.modern-form-input,
.modern-form-textarea {
    width: 100%;
    padding: 0.875rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    background: var(--card-bg);
    color: var(--text-primary);
    font-size: 0.95rem;
    font-family: inherit;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--shadow-sm);
}

.modern-form-input::placeholder,
.modern-form-textarea::placeholder {
    color: var(--text-secondary);
}

.modern-form-input:focus,
.modern-form-textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 
        0 0 0 3px rgb(37 99 235 / 0.1),
        var(--shadow-md);
    transform: translateY(-1px);
}

.modern-form-textarea {
    resize: vertical;
    min-height: 120px;
    font-family: inherit;
    line-height: 1.5;
}

.modern-form-input[type="number"] {
    text-align: center;
    font-weight: 600;
}

/* Modern Buttons - Panel Consistent */
.modern-btn-group {
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.modern-btn {
    padding: 0.75rem 1.5rem;
    border: 2px solid transparent;
    border-radius: var(--border-radius);
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    box-shadow: var(--shadow-sm);
    font-family: inherit;
}

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

.modern-btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
    color: white;
    text-decoration: none;
}

.modern-btn-secondary {
    background: var(--card-bg);
    color: var(--text-secondary);
    border-color: var(--border-color);
}

.modern-btn-secondary:hover {
    background: var(--background-color);
    color: var(--text-primary);
    border-color: var(--primary-color);
    transform: translateY(-1px);
    text-decoration: none;
}

/* Edit button improvements - Panel Consistent */
.modern-edit-btn {
    background: var(--primary-color);
    border: none;
    color: white;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-sm);
    font-family: inherit;
}

.modern-edit-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.modern-delete-btn {
    background: var(--error-color);
    border: none;
    color: white;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
    box-shadow: var(--shadow-sm);
    font-family: inherit;
}

.modern-delete-btn:hover {
    background: #b91c1c;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
    color: white;
    text-decoration: none;
}

/* Form animations */
@keyframes formSlideIn {
    from {
        opacity: 0;
        transform: translateY(-20px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.modern-edit-form.show {
    animation: formSlideIn 0.4s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

/* Theme Toggle */
.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1001;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 50px;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-md);
}

/* Theme Toggle in User Menu */
.user-menu .theme-toggle {
    position: static;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    box-shadow: var(--shadow-sm);
    margin-right: 0.5rem;
}

.user-menu .theme-toggle:hover {
    transform: scale(1.05);
}

.theme-toggle:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-lg);
}

.theme-icon {
    font-size: 1.5rem;
    transition: transform 0.3s ease;
}

.theme-toggle:hover .theme-icon {
    transform: rotate(180deg);
}

/* Dark Mode Styles */
body.dark-mode {
    --primary-color: #3b82f6;
    --primary-dark: #2563eb;
    --secondary-color: #94a3b8;
    --background-color: #121212;
    --card-bg: #1e1e1e;
    --text-primary: #e2e8f0;
    --text-secondary: #a1a1aa;
    --border-color: #374151;
    --success-color: #10b981;
    --error-color: #ef4444;
    --warning-color: #f59e0b;
    --shadow-sm: 0 1px 2px 0 rgba(255, 255, 255, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(255, 255, 255, 0.1), 0 2px 4px -2px rgba(255, 255, 255, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(255, 255, 255, 0.1), 0 4px 6px -4px rgba(255, 255, 255, 0.1);
}

/* Dark mode login container */
body.dark-mode .login-container {
    background: linear-gradient(135deg, #1f2937 0%, #111827 100%);
}

/* Dark mode additional fixes for white elements */
body.dark-mode .btn-primary {
    color: #e2e8f0;
}

body.dark-mode .btn-primary:hover {
    color: #e2e8f0;
}

body.dark-mode .btn-secondary {
    color: #e2e8f0;
}

body.dark-mode .btn-link {
    color: #e2e8f0;
}

body.dark-mode .btn-link:hover {
    color: #e2e8f0;
}

body.dark-mode .modern-btn-primary {
    color: #e2e8f0;
}

body.dark-mode .modern-btn-primary:hover {
    color: #e2e8f0;
}

body.dark-mode .modern-edit-btn {
    color: #e2e8f0;
}

body.dark-mode .modern-delete-btn {
    color: #e2e8f0;
}

body.dark-mode .modern-delete-btn:hover {
    color: #e2e8f0;
}

body.dark-mode .user-avatar {
    color: #e2e8f0;
}

body.dark-mode .lesson-number {
    color: #e2e8f0;
}

body.dark-mode .badge-success {
    color: #e2e8f0;
}

body.dark-mode .badge-secondary {
    color: #e2e8f0;
}

/* Mobile responsive */
@media (max-width: 768px) {
    .modern-form-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .modern-btn-group {
        flex-direction: column;
    }
    
    .modern-edit-form {
        padding: 1.5rem;
        margin-top: 1rem;
    }
    
    .theme-toggle {
        top: 15px;
        right: 15px;
        width: 45px;
        height: 45px;
    }
}

/* Video embed hint box */
.video-hint-box {
    background: var(--background-color);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 0.875rem;
    margin-bottom: 0.75rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.video-hint-box strong {
    color: var(--primary-color);
}
    color: var(--text-primary);
}

/* Purchase History */
.purchase-table {
    width: 100%;
    border-collapse: collapse;
}

.purchase-table th,
.purchase-table td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.purchase-table th {
    font-weight: 600;
    color: var(--text-primary);
    background: #f8fafc;
}

.status-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
}

.status-completed {
    background: #dcfce7;
    color: var(--success-color);
}

.status-pending {
    background: #fef3c7;
    color: var(--warning-color);
}

/* N8N Instance Card */
.instance-card {
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    transition: all 0.2s ease;
}

.instance-card:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-md);
}

.instance-status {
    display: inline-block;
    padding: 0.5rem 1rem;
    border-radius: 2rem;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 1rem;
}

.instance-active {
    background: #dcfce7;
    color: var(--success-color);
}

.instance-pending {
    background: #fef3c7;
    color: var(--warning-color);
}

/* Responsive Design */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }
    
    .sidebar.mobile-open {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .main-body {
        padding: 1rem;
    }
    
    .login-card {
        padding: 2rem;
    }
    
    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }
}

/* Loading States */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Utilities */
.text-center { text-align: center; }
.text-right { text-align: right; }
.mb-1 { margin-bottom: 0.25rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 1rem; }
.mb-4 { margin-bottom: 1.5rem; }
.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 1rem; }
.mt-4 { margin-top: 1.5rem; }
.font-bold { font-weight: 600; }
.text-sm { font-size: 0.875rem; }
.text-lg { font-size: 1.125rem; }
.text-primary { color: var(--primary-color); }
.text-secondary { color: var(--text-secondary); }
.text-success { color: var(--success-color); }
.text-error { color: var(--error-color); }