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

:root {
    /* Keystone Brand Colors */
    --primary-color: #1B5FA6;
    --primary-dark: #154A85;
    --primary-light: #2E7BC6;
    --accent-color: #F4D03F;
    --accent-dark: #D4B02F;
    --secondary-color: #64748B;
    --success-color: #10B981;
    --warning-color: #F59E0B;
    --error-color: #EF4444;
    
    /* Light mode colors */
    --text-dark: #1E293B;
    --text-light: #64748B;
    --bg-light: #F8FAFC;
    --bg-white: #FFFFFF;
    --border-color: #E2E8F0;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

/* Dark mode colors */
[data-theme="dark"] {
    --text-dark: #F1F5F9;
    --text-light: #94A3B8;
    --bg-light: #0F172A;
    --bg-white: #1E293B;
    --border-color: #334155;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-light);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Navigation */
.navbar {
    background-color: var(--bg-white);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 4rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
}

.logo-image {
    height: 45px;
    width: auto;
}

.logo-text {
    display: flex;
    flex-direction: column;
}

.logo-text-main {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
    letter-spacing: -0.025em;
    line-height: 1.2;
}

.logo-text-sub {
    font-size: 0.65em;
    font-weight: 400;
    color: var(--text-light);
    margin-top: -2px;
}

/* Theme Toggle */
.theme-toggle {
    background: transparent;
    border: none;
    border-radius: 0.375rem;
    padding: 0.75rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: all 0.2s;
    color: var(--text-dark);
    font-size: 0.875rem;
    font-weight: 500;
    min-height: 44px;
    min-width: 44px;
}

.theme-toggle:hover {
    background-color: var(--bg-light);
    transform: scale(1.1);
}

.theme-icon {
    font-size: 1.125rem;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-link {
    color: var(--text-dark);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
    padding: 0.5rem 1rem;
    display: inline-block;
    min-height: 44px;
    line-height: 1.5;
}

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

/* Navigation Dropdown */
.nav-dropdown {
    position: relative;
}

.nav-dropdown-toggle {
    background: none;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.dropdown-chevron {
    transition: transform 0.3s;
}

.nav-dropdown.active .dropdown-chevron {
    transform: rotate(180deg);
}

.nav-dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background: var(--bg-white);
    border-radius: 0.5rem;
    box-shadow: var(--shadow-lg);
    min-width: 180px;
    padding: 0.5rem 0;
    margin-top: 0.5rem;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s;
    z-index: 1000;
}

.nav-dropdown.active .nav-dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.nav-dropdown-item {
    display: block;
    padding: 0.75rem 1.25rem;
    color: var(--text-dark);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.2s;
    min-height: 44px;
    line-height: 1.5;
}

.nav-dropdown-item:hover {
    background: var(--bg-light);
    color: var(--primary-color);
}

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

.user-name {
    color: var(--text-light);
    font-size: 0.875rem;
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 0.25rem;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.75rem;
    min-width: 44px;
    min-height: 44px;
}

.mobile-menu-toggle span {
    width: 1.5rem;
    height: 2px;
    background-color: var(--text-dark);
    transition: all 0.3s;
}

/* Info Button */
.info-button {
    background: transparent;
    color: var(--primary-color);
    border: none;
    border-radius: 50%;
    width: 32px;
    height: 32px;
    min-width: 44px;
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
    margin-left: 0.5rem;
}

.info-button svg {
    width: 16px;
    height: 16px;
}

.info-button:hover {
    background: var(--bg-light);
    color: var(--primary-dark);
    transform: scale(1.1);
}

/* Info Modal */
.info-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 9999;
}

.info-modal.active {
    display: block;
}

.info-modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
}

.info-modal-content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: var(--bg-white);
    border-radius: 0.5rem;
    box-shadow: var(--shadow-lg);
    max-width: 320px;
    width: 90%;
    max-height: 70vh;
    overflow-y: auto;
    animation: modalSlideIn 0.3s ease-out;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translate(-50%, -45%);
    }
    to {
        opacity: 1;
        transform: translate(-50%, -50%);
    }
}

.info-modal-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: var(--bg-light);
    border: none;
    border-radius: 50%;
    width: 36px;
    height: 36px;
    min-width: 44px;
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--text-light);
    cursor: pointer;
    transition: all 0.2s;
}

.info-modal-close:hover {
    background: var(--error-color);
    color: white;
    transform: rotate(90deg);
}

.info-modal-body {
    padding: 1.25rem 1rem 1rem;
}

.info-modal-body h2 {
    color: var(--primary-color);
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 0.6rem;
    padding-bottom: 0.35rem;
    border-bottom: 2px solid var(--primary-color);
}

.info-modal-body p {
    color: var(--text-dark);
    line-height: 1.5;
    margin-bottom: 0.6rem;
    font-size: 0.85rem;
}

.info-section {
    background: var(--bg-light);
    padding: 0.6rem;
    border-radius: 0.35rem;
    margin: 0.6rem 0;
    border-left: 3px solid var(--primary-color);
}

.info-section h3 {
    color: var(--text-dark);
    font-size: 0.75rem;
    font-weight: 600;
    margin-bottom: 0.35rem;
    text-transform: uppercase;
    letter-spacing: 0.2px;
}

.info-section p {
    margin-bottom: 0.3rem;
    font-size: 0.85rem;
}

.info-section p:last-child {
    margin-bottom: 0;
}

.info-title {
    color: var(--text-light) !important;
    font-size: 0.8rem;
    font-style: italic;
}

.info-footer {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white !important;
    padding: 0.75rem;
    border-radius: 0.35rem;
    margin-top: 0.6rem;
    text-align: center;
    font-weight: 500;
    font-size: 0.8rem;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.875rem 1.5rem;
    border-radius: 0.375rem;
    font-weight: 500;
    text-decoration: none;
    text-align: center;
    cursor: pointer;
    border: none;
    transition: all 0.2s;
    font-size: 1rem;
    min-height: 44px;
    line-height: 1.5;
}

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

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

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

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

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

.btn-danger:hover {
    background-color: #DC2626;
}

.btn-sm {
    padding: 0.75rem 1rem;
    font-size: 0.875rem;
    min-height: 44px;
    line-height: 1.5;
}

.btn-lg {
    padding: 0.875rem 2rem;
    font-size: 1.125rem;
    min-height: 48px;
}

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

.btn-icon {
    padding: 0.75rem;
    background: transparent;
    border: none;
    cursor: pointer;
    color: var(--text-light);
    transition: color 0.2s;
    min-width: 44px;
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

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

.btn-icon.btn-danger:hover {
    color: var(--error-color);
}

/* Flash Messages */
.flash-messages {
    position: fixed;
    top: 4rem;
    right: 1rem;
    z-index: 1000;
    max-width: 400px;
}

.flash-message {
    background-color: var(--bg-white);
    color: var(--text-dark);
    border-radius: 0.5rem;
    box-shadow: var(--shadow-lg);
    margin-bottom: 0.5rem;
    padding: 1rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-left: 4px solid;
    transition: opacity 0.3s;
}

.flash-success {
    border-left-color: var(--success-color);
}

.flash-error {
    border-left-color: var(--error-color);
}

.flash-info {
    border-left-color: var(--primary-color);
}

.flash-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-light);
    padding: 0 0.5rem;
}

/* Hero Section */
.hero {
    position: relative;
    background: linear-gradient(135deg, #667EEA 0%, #764BA2 100%);
    color: white;
    padding: 4rem 0;
    overflow: hidden;
}

.hero-video-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.2;
    z-index: 0;
}

.hero-container {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1.5rem;
}

.hero-subtitle {
    font-size: 1.25rem;
    line-height: 1.8;
    margin-bottom: 2rem;
    opacity: 0.95;
}

.hero-cta {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    align-items: center;
}

.hero-cta .btn {
    font-weight: 600;
    letter-spacing: 0.3px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 14px 0 rgba(0, 0, 0, 0.1);
    border: none;
    position: relative;
    overflow: hidden;
}

.hero-cta .btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 0;
    height: 100%;
    background: rgba(255, 255, 255, 0.1);
    transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.hero-cta .btn:hover::before {
    width: 100%;
}

.hero-cta .btn-primary {
    background: linear-gradient(135deg, #1B5FA6 0%, #154987 100%);
    box-shadow: 0 8px 24px 0 rgba(27, 95, 166, 0.3);
}

.hero-cta .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 32px 0 rgba(27, 95, 166, 0.4);
}

.hero-cta .btn-secondary {
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    border: 2px solid rgba(255, 255, 255, 0.3);
    color: white;
}

.hero-cta .btn-secondary:hover {
    background: rgba(255, 255, 255, 0.3);
    border-color: rgba(255, 255, 255, 0.5);
    transform: translateY(-2px);
    box-shadow: 0 12px 32px 0 rgba(255, 255, 255, 0.2);
}

.hero-graphic {
    display: flex;
    justify-content: center;
}

/* Features Section */
.features {
    padding: 4rem 0;
    background-color: var(--bg-white);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 600;
    text-align: center;
    margin-bottom: 3rem;
    color: var(--text-dark);
}

.section-description {
    text-align: center;
    font-size: 1.125rem;
    color: var(--text-light);
    max-width: 700px;
    margin: 0 auto 3rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.feature-card {
    text-align: center;
    padding: 2rem;
}

.feature-icon {
    width: 4rem;
    height: 4rem;
    margin: 0 auto 1.5rem;
    color: var(--primary-color);
}

.feature-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.feature-card p {
    color: var(--text-light);
    line-height: 1.8;
}

/* Course Preview */
.course-preview {
    padding: 4rem 0;
    background-color: var(--bg-light);
}

.modules-preview {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.module-preview {
    background: var(--bg-white);
    padding: 1.5rem;
    border-radius: 0.5rem;
    box-shadow: var(--shadow-sm);
}

.module-preview h4 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.module-preview p {
    color: var(--text-light);
    font-size: 0.875rem;
}

.cta-section {
    text-align: center;
}

/* Auth Pages */
.auth-container {
    min-height: calc(100vh - 8rem);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem 0;
}

.auth-card {
    background: var(--bg-white);
    border-radius: 0.75rem;
    box-shadow: var(--shadow-lg);
    padding: 3rem;
    width: 100%;
    max-width: 500px;
}

.auth-title {
    font-size: 2rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

.auth-subtitle {
    text-align: center;
    color: var(--text-light);
    margin-bottom: 2rem;
}

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

.auth-footer {
    text-align: center;
    margin-top: 1.5rem;
    color: var(--text-light);
}

.auth-footer a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

/* Forms */
.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

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

.form-group label {
    font-weight: 500;
    color: var(--text-dark);
}

.form-input,
.form-select {
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 0.375rem;
    font-size: 1rem;
    transition: border-color 0.2s;
    background: var(--bg-white);
    color: var(--text-dark);
}

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

textarea.form-input {
    resize: vertical;
    font-family: inherit;
}

.form-hint {
    font-size: 0.875rem;
    color: var(--text-light);
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
    width: 1.25rem;
    height: 1.25rem;
}

.form-actions {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
}

/* Page Header */
.page-header {
    background: var(--bg-white);
    padding: 2rem 0;
    box-shadow: var(--shadow-sm);
    margin-bottom: 2rem;
}

.page-header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.page-header p {
    color: var(--text-light);
    font-size: 1.125rem;
}

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

.breadcrumb {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    margin-bottom: 1rem;
    font-size: 0.875rem;
    color: var(--text-light);
}

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

.course-info {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
}

/* Dashboard */
.dashboard {
    padding: 2rem 0 4rem;
}

.dashboard-header {
    margin-bottom: 2rem;
    background: var(--primary-color);
    padding: 2rem;
    border-radius: 0.75rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 2rem;
}

.dashboard-header-content {
    flex: 1;
}

.dashboard-header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: #FFFFFF;
}

.dashboard-header p {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.125rem;
}

.dashboard-header-video {
    flex-shrink: 0;
}

.dashboard-header-video video {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    object-fit: cover;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.course-progress-card {
    background: var(--bg-white);
    border-radius: 0.75rem;
    padding: 2rem;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
}

.course-progress-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: 1.5rem;
}

.course-progress-header h2 {
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.course-level {
    color: var(--text-light);
    font-size: 0.875rem;
}

.completion-badge {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--success-color);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 2rem;
    font-size: 0.875rem;
    font-weight: 600;
}

.progress-bar-container {
    margin-bottom: 1.5rem;
}

.progress-bar {
    height: 0.75rem;
    background: var(--bg-light);
    border-radius: 1rem;
    overflow: hidden;
    margin-bottom: 0.5rem;
}

.progress-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
    border-radius: 1rem;
    transition: width 0.3s;
}

.progress-text {
    font-size: 0.875rem;
    color: var(--text-light);
}

.course-actions {
    display: flex;
    gap: 1rem;
}

/* Courses Grid */
.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 2rem;
    padding: 2rem 0;
}

.course-card {
    background: var(--bg-white);
    border-radius: 0.75rem;
    padding: 2rem;
    box-shadow: var(--shadow);
    transition: transform 0.2s, box-shadow 0.2s;
}

.course-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

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

.course-level-badge {
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

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

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

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

.course-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.course-description {
    color: var(--text-light);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.course-meta {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
    font-size: 0.875rem;
    color: var(--text-light);
}

.course-duration,
.course-lessons {
    display: flex;
    align-items: center;
    gap: 0.375rem;
}

/* Module Accordion */
.search-filter-section {
    background: var(--bg-white);
    padding: 1.5rem;
    border-radius: 0.75rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow-sm);
}

.search-box {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
    padding: 0.75rem 1rem;
    background: var(--bg-light);
    border-radius: 0.5rem;
    border: 1px solid var(--border-color);
}

.search-box svg {
    color: var(--text-light);
    flex-shrink: 0;
}

.search-input {
    flex: 1;
    border: none;
    background: transparent;
    font-size: 1rem;
    color: var(--text-dark);
    outline: none;
}

.search-input::placeholder {
    color: var(--text-light);
}

.filter-controls {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.filter-select {
    flex: 1;
    min-width: 200px;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    background: var(--bg-white);
    font-size: 1rem;
    color: var(--text-dark);
    cursor: pointer;
    outline: none;
    transition: all 0.2s;
}

.filter-select:hover {
    border-color: var(--primary-color);
}

.filter-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.course-content {
    padding: 2rem 0;
}

.module-accordion {
    background: var(--bg-white);
    border-radius: 0.75rem;
    margin-bottom: 1.5rem;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.module-header {
    padding: 1.5rem;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background-color 0.2s;
}

.module-header:hover {
    background-color: var(--bg-light);
}

.module-info h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.module-summary {
    color: var(--text-light);
    font-size: 0.875rem;
}

.module-chevron {
    transition: transform 0.3s;
    color: var(--text-light);
}

.module-chevron.rotated {
    transform: rotate(180deg);
}

.module-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
}

.module-content.active {
    max-height: 2000px;
}

.lesson-list {
    list-style: none;
    padding: 0 1.5rem 1.5rem;
}

.lesson-item {
    border-bottom: 1px solid var(--border-color);
}

.lesson-item:last-child {
    border-bottom: none;
}

.lesson-link {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem 0;
    text-decoration: none;
    color: var(--text-dark);
    transition: color 0.2s;
}

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

.lesson-check,
.lesson-circle {
    flex-shrink: 0;
    color: var(--success-color);
}

.lesson-circle {
    color: var(--border-color);
}

.lesson-title {
    flex: 1;
}

.lesson-duration {
    font-size: 0.875rem;
    color: var(--text-light);
}

/* Lesson View */
.lesson-container {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 2rem;
    padding: 2rem 0;
    min-height: calc(100vh - 8rem);
}

.lesson-sidebar {
    background: var(--bg-white);
    border-radius: 0.75rem;
    padding: 1.5rem;
    height: fit-content;
    position: sticky;
    top: 5rem;
    box-shadow: var(--shadow);
}

.sidebar-header {
    margin-bottom: 1.5rem;
}

.back-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

.lesson-nav h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border-color);
}

.lesson-nav-item {
    display: block;
    padding: 0.75rem;
    margin-bottom: 0.5rem;
    border-radius: 0.375rem;
    text-decoration: none;
    color: var(--text-dark);
    font-size: 0.875rem;
    transition: background-color 0.2s;
}

.lesson-nav-item:hover {
    background-color: var(--bg-light);
}

.lesson-nav-item.active {
    background-color: var(--primary-color);
    color: white;
}

.lesson-main {
    background: var(--bg-white);
    border-radius: 0.75rem;
    padding: 3rem;
    box-shadow: var(--shadow);
}

.lesson-header {
    margin-bottom: 2rem;
}

.lesson-meta-bar {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
    font-size: 0.875rem;
    color: var(--text-light);
}

.lesson-number,
.lesson-duration {
    background: var(--bg-light);
    padding: 0.25rem 0.75rem;
    border-radius: 0.25rem;
}

.lesson-header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.completion-status {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--success-color);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 0.375rem;
    font-size: 0.875rem;
    font-weight: 600;
}

.lesson-content {
    margin-bottom: 3rem;
    line-height: 1.8;
}

.lesson-content h2 {
    font-size: 1.75rem;
    font-weight: 600;
    margin: 2rem 0 1rem;
}

.lesson-content h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin: 1.5rem 0 0.75rem;
}

.lesson-content p {
    margin-bottom: 1rem;
}

.lesson-content ul,
.lesson-content ol {
    margin-left: 2rem;
    margin-bottom: 1rem;
}

.lesson-content li {
    margin-bottom: 0.5rem;
}

.key-terms-box {
    background: var(--bg-light);
    border-left: 4px solid var(--primary-color);
    padding: 1.5rem;
    border-radius: 0.375rem;
    margin-bottom: 3rem;
}

.key-terms-box h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.key-terms-content {
    color: var(--text-dark);
    line-height: 1.8;
}

/* Quiz Section */
.quiz-section {
    background: var(--bg-light);
    padding: 2rem;
    border-radius: 0.75rem;
    margin-bottom: 2rem;
}

.quiz-section h2 {
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.quiz-instruction {
    color: var(--text-light);
    margin-bottom: 2rem;
}

.quiz-form {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.quiz-question {
    background: var(--bg-white);
    padding: 1.5rem;
    border-radius: 0.5rem;
}

.question-text {
    font-size: 1.125rem;
    font-weight: 500;
    margin-bottom: 1rem;
}

.quiz-options {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.quiz-option {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem;
    border: 2px solid var(--border-color);
    border-radius: 0.5rem;
    cursor: pointer;
    transition: all 0.2s;
}

.quiz-option:hover {
    border-color: var(--primary-color);
    background: var(--bg-light);
}

.quiz-option input[type="radio"] {
    width: 1.25rem;
    height: 1.25rem;
}

.lesson-navigation {
    display: flex;
    justify-content: flex-end;
    margin-top: 2rem;
}

/* Exam */
.exam-container {
    max-width: 800px;
    margin: 2rem auto;
}

.exam-info {
    background: var(--bg-white);
    padding: 1.5rem;
    border-radius: 0.75rem;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
}

.exam-info h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.exam-info ul {
    list-style: none;
}

.exam-info li {
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-color);
}

.exam-info li:last-child {
    border-bottom: none;
}

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

.exam-submit {
    text-align: center;
    margin-top: 2rem;
}

/* Certificate */
.certificate-container {
    padding: 2rem 0;
}

.certificate {
    background: var(--bg-white);
    max-width: 900px;
    margin: 0 auto;
    padding: 3rem;
}

.certificate-border {
    border: 3px double var(--primary-color);
    padding: 3rem;
}

.certificate-header {
    text-align: center;
    margin-bottom: 3rem;
}

.certificate-logo {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
    letter-spacing: 0.1em;
    margin-bottom: 1rem;
}

.certificate-ornament {
    width: 100px;
    height: 3px;
    background: linear-gradient(90deg, transparent, var(--primary-color), transparent);
    margin: 0 auto;
}

.certificate-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 3rem;
    color: var(--text-dark);
}

.certificate-body {
    text-align: center;
    margin-bottom: 3rem;
}

.certificate-text {
    font-size: 1.125rem;
    color: var(--text-light);
    margin-bottom: 0.5rem;
}

.certificate-name {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin: 1.5rem 0;
}

.certificate-course {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-dark);
    margin: 1rem 0;
}

.certificate-date {
    font-size: 1rem;
    color: var(--text-light);
    margin-top: 1.5rem;
}

.certificate-footer {
    display: flex;
    justify-content: space-between;
    align-items: end;
    margin-top: 4rem;
}

.certificate-signature {
    text-align: left;
}

.signature-line {
    width: 200px;
    height: 2px;
    background: var(--text-dark);
    margin-bottom: 0.5rem;
}

.signature-title {
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.signature-org {
    font-size: 0.875rem;
    color: var(--text-light);
}

.certificate-id {
    text-align: right;
    font-size: 0.875rem;
}

/* Admin Styles */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.stat-card {
    background: var(--bg-white);
    padding: 1.5rem;
    border-radius: 0.75rem;
    box-shadow: var(--shadow);
}

.stat-card h3 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-light);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.admin-section {
    background: var(--bg-white);
    padding: 2rem;
    border-radius: 0.75rem;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.section-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
}

.table-responsive {
    overflow-x: auto;
}

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

.admin-table thead {
    background: var(--bg-light);
}

.admin-table th {
    padding: 1rem;
    text-align: left;
    font-weight: 600;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-light);
}

.admin-table td {
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.admin-table tbody tr:hover {
    background: var(--bg-light);
}

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

.status-active {
    color: var(--success-color);
    font-weight: 600;
}

.status-inactive {
    color: var(--text-light);
}

.badge {
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.75rem;
    font-weight: 600;
}

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

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

.form-container {
    max-width: 800px;
    margin: 2rem auto;
    background: var(--bg-white);
    padding: 2rem;
    border-radius: 0.75rem;
    box-shadow: var(--shadow);
}

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

.questions-list {
    padding: 2rem 0;
}

.question-card {
    background: var(--bg-white);
    padding: 1.5rem;
    border-radius: 0.75rem;
    box-shadow: var(--shadow);
    margin-bottom: 1.5rem;
}

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

.question-header h3 {
    font-size: 1.125rem;
    font-weight: 600;
}

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

.question-text {
    margin-bottom: 1rem;
    font-size: 1.125rem;
}

.question-options {
    list-style: none;
    margin: 1rem 0;
}

.question-options li {
    padding: 0.75rem;
    margin-bottom: 0.5rem;
    border-radius: 0.375rem;
    background: var(--bg-light);
}

.question-options li.correct-answer {
    background: #D1FAE5;
    color: var(--success-color);
    font-weight: 600;
}

.correct-indicator {
    font-size: 0.875rem;
    color: var(--text-light);
}

.empty-state {
    text-align: center;
    padding: 3rem;
    color: var(--text-light);
}

/* Analytics Page */
.analytics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--bg-white);
    padding: 1.5rem;
    border-radius: 0.75rem;
    box-shadow: var(--shadow-sm);
    display: flex;
    align-items: center;
    gap: 1rem;
}

.stat-icon {
    width: 3rem;
    height: 3rem;
    border-radius: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.stat-content h3 {
    font-size: 0.875rem;
    color: var(--text-light);
    margin-bottom: 0.25rem;
    font-weight: 500;
}

.stat-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-dark);
}

.analytics-section {
    background: var(--bg-white);
    padding: 2rem;
    border-radius: 0.75rem;
    box-shadow: var(--shadow-sm);
    margin-bottom: 2rem;
}

.analytics-section h2 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--text-dark);
}

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

.module-stat-card {
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    padding: 1.25rem;
}

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

.module-stat-header h3 {
    font-size: 1.125rem;
    color: var(--text-dark);
}

.module-completion {
    font-size: 0.875rem;
    color: var(--text-light);
    font-weight: 500;
}

.module-stat-content {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.time-spent-info {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-light);
    font-size: 0.875rem;
}

.progress-bar-container {
    flex: 1;
    height: 0.5rem;
    background: var(--bg-light);
    border-radius: 0.25rem;
    overflow: hidden;
}

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

.progress-percentage {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--primary-color);
    min-width: 3rem;
    text-align: right;
}

.quiz-attempts-table,
.lesson-progress-table {
    width: 100%;
    overflow-x: auto;
}

.quiz-attempts-table table,
.lesson-progress-table table {
    width: 100%;
    border-collapse: collapse;
}

.quiz-attempts-table th,
.lesson-progress-table th {
    text-align: left;
    padding: 0.75rem;
    border-bottom: 2px solid var(--border-color);
    font-weight: 600;
    color: var(--text-dark);
    font-size: 0.875rem;
}

.quiz-attempts-table td,
.lesson-progress-table td {
    padding: 0.75rem;
    border-bottom: 1px solid var(--border-color);
}

.lesson-link-text {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

.lesson-link-text:hover {
    text-decoration: underline;
}

.status-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 0.25rem;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.status-passed {
    background: #D1FAE5;
    color: #10B981;
}

.status-failed {
    background: #FEE2E2;
    color: #EF4444;
}

.status-completed {
    background: #DBEAFE;
    color: #3B82F6;
}

.status-in-progress {
    background: #FEF3C7;
    color: #F59E0B;
}

/* Preview Pages */
.preview-banner {
    background: linear-gradient(135deg, #4F46E5 0%, #6366F1 100%);
    color: white;
    padding: 1rem 0;
}

.preview-banner-content {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.preview-badge {
    background: #10B981;
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 0.25rem;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.preview-banner-content p {
    margin: 0;
}

.preview-banner-content a {
    color: white;
    text-decoration: underline;
}

.preview-course-section {
    background: var(--bg-white);
    border-radius: 0.75rem;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-sm);
}

.preview-course-header {
    margin-bottom: 2rem;
}

.preview-course-header h2 {
    font-size: 1.75rem;
    margin-bottom: 0.5rem;
}

.preview-lessons-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

.preview-lesson-card {
    background: var(--bg-light);
    border-radius: 0.5rem;
    padding: 1.5rem;
    position: relative;
    border: 1px solid var(--border-color);
    transition: transform 0.2s, box-shadow 0.2s;
}

.preview-lesson-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.preview-lesson-card .preview-badge {
    position: absolute;
    top: 1rem;
    right: 1rem;
}

.preview-lesson-card h3 {
    font-size: 0.875rem;
    color: var(--text-light);
    margin-bottom: 0.5rem;
}

.preview-lesson-card h4 {
    font-size: 1.125rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.preview-lesson-card .lesson-duration {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-light);
    font-size: 0.875rem;
    margin-bottom: 1rem;
}

.cta-section {
    background: linear-gradient(135deg, #4F46E5 0%, #6366F1 100%);
    color: white;
    border-radius: 0.75rem;
    padding: 3rem 2rem;
    text-align: center;
    margin-top: 3rem;
}

.cta-content h2 {
    font-size: 2rem;
    margin-bottom: 0.75rem;
}

.cta-content p {
    font-size: 1.125rem;
    margin-bottom: 2rem;
    opacity: 0.95;
}

.cta-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.preview-cta-box {
    background: var(--bg-light);
    border-radius: 0.75rem;
    padding: 2rem;
    text-align: center;
    margin-top: 2rem;
    border: 2px dashed var(--border-color);
}

.preview-cta-box h3 {
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
    color: var(--text-dark);
}

.preview-cta-box p {
    color: var(--text-light);
    margin-bottom: 1.5rem;
}

.preview-info {
    background: var(--bg-light);
    padding: 1rem;
    border-radius: 0.5rem;
    margin-top: 1rem;
}

.preview-info p {
    font-size: 0.875rem;
    color: var(--text-light);
    margin-bottom: 0.75rem;
}

/* Footer */
.footer {
    background: var(--text-dark);
    color: white;
    text-align: center;
    padding: 2rem 0;
    margin-top: 4rem;
}

/* Responsive Design */

/* Tablet and below - 1024px */
@media (max-width: 1024px) {
    .container {
        padding-left: 2rem;
        padding-right: 2rem;
    }
    
    .course-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .modules-list {
        gap: 1rem;
    }
}

/* Mobile and tablet - 768px */
@media (max-width: 768px) {
    /* Mobile Navigation */
    .nav-menu {
        position: fixed;
        top: 4rem;
        right: -100%;
        width: 80%;
        max-width: 300px;
        height: calc(100vh - 4rem);
        background: var(--bg-white);
        flex-direction: column;
        align-items: stretch;
        padding: 2rem;
        box-shadow: var(--shadow-lg);
        transition: right 0.3s ease;
        z-index: 999;
        overflow-y: auto;
    }

    .nav-menu.active {
        right: 0;
    }

    .mobile-menu-toggle {
        display: flex;
        min-width: 44px;
        min-height: 44px;
    }
    
    .nav-link {
        padding: 0.75rem 0;
        border-bottom: 1px solid var(--border-color);
        font-size: 1rem;
    }
    
    /* Dropdown Mobile */
    .nav-dropdown {
        width: 100%;
    }
    
    .nav-dropdown-toggle {
        width: 100%;
        justify-content: space-between;
        padding: 0.75rem 0;
        border-bottom: 1px solid var(--border-color);
    }
    
    .nav-dropdown-menu {
        position: static;
        box-shadow: none;
        background: transparent;
        padding: 0;
        margin: 0;
        transform: none;
        border-left: 2px solid var(--primary-color);
        padding-left: 1rem;
        margin-left: 0.5rem;
        margin-top: 0.5rem;
    }
    
    .nav-dropdown.active .nav-dropdown-menu {
        display: block;
    }
    
    .nav-dropdown-menu:not(.nav-dropdown.active .nav-dropdown-menu) {
        display: none;
    }
    
    .nav-dropdown-item {
        padding: 0.5rem 0;
        border-bottom: none;
    }
    
    .nav-user {
        flex-direction: column;
        align-items: stretch;
        gap: 0.75rem;
        margin-top: 1rem;
        padding-top: 1rem;
        border-top: 1px solid var(--border-color);
    }
    
    .user-name {
        font-size: 0.875rem;
    }
    
    .theme-toggle {
        width: 100%;
        justify-content: center;
        min-height: 44px;
    }
    
    /* Logo */
    .logo-image {
        height: 35px;
    }
    
    .logo-text-main {
        font-size: 1rem;
    }
    
    .logo-text-sub {
        font-size: 0.55rem;
    }
    
    /* Info Button Mobile */
    .info-button {
        margin-left: 0.5rem;
        width: 36px;
        height: 36px;
    }
    
    .info-modal-content {
        width: 95%;
        max-height: 90vh;
        border-radius: 0.75rem;
    }
    
    .info-modal-body {
        padding: 2rem 1.25rem 1.5rem;
    }
    
    .info-modal-body h2 {
        font-size: 1.5rem;
    }
    
    .info-section {
        padding: 1rem;
        margin: 1rem 0;
    }
    
    .info-section h3 {
        font-size: 0.9rem;
    }
    
    .info-modal-close {
        top: 0.75rem;
        right: 0.75rem;
    }

    /* Dashboard Header */
    .dashboard-header {
        flex-direction: column;
        text-align: center;
        gap: 1.5rem;
    }
    
    .dashboard-header h1 {
        font-size: 1.75rem;
    }
    
    .dashboard-header p {
        font-size: 1rem;
    }
    
    .dashboard-header-video video {
        width: 150px;
        height: 150px;
    }

    /* Hero Section */
    .hero-container {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .hero-graphic {
        display: none;
    }

    .hero-title {
        font-size: 2rem;
        line-height: 1.2;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .hero-cta {
        flex-direction: column;
        gap: 0.75rem;
    }
    
    .hero-cta .btn {
        width: 100%;
        text-align: center;
    }

    /* Features Grid */
    .features-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .section-title {
        font-size: 1.75rem;
    }

    /* Forms */
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .btn {
        width: 100%;
        min-height: 44px;
        padding: 0.75rem 1.5rem;
    }
    
    .btn-sm {
        min-height: 44px;
        padding: 0.75rem 1rem;
    }

    /* Course Grid */
    .course-grid {
        grid-template-columns: 1fr;
    }
    
    .modules-preview {
        grid-template-columns: 1fr;
    }

    /* Lesson Layout */
    .lesson-container {
        grid-template-columns: 1fr;
    }

    .lesson-sidebar {
        position: static;
        max-height: none;
    }

    .lesson-main {
        padding: 1.5rem;
    }
    
    .lesson-header h1 {
        font-size: 1.5rem;
    }

    /* Quiz */
    .quiz-option {
        padding: 1rem;
        min-height: 44px;
    }
    
    .quiz-navigation {
        flex-direction: column;
        gap: 0.75rem;
    }
    
    .quiz-navigation .btn {
        width: 100%;
    }

    /* Stats Grid */
    .stats-grid {
        grid-template-columns: 1fr 1fr;
        gap: 1rem;
    }
    
    .stat-card {
        padding: 1rem;
    }
    
    .stat-value {
        font-size: 1.75rem;
    }

    /* Header */
    .header-flex {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }

    .course-actions {
        flex-direction: column;
        width: 100%;
    }
    
    .course-actions .btn {
        width: 100%;
    }

    /* Tables - convert to cards on mobile */
    .table-container {
        overflow-x: visible;
    }
    
    table {
        display: block;
    }
    
    thead {
        display: none;
    }
    
    tbody {
        display: block;
    }
    
    tr {
        display: block;
        margin-bottom: 1rem;
        border: 1px solid var(--border-color);
        border-radius: 0.5rem;
        padding: 1rem;
        background: var(--bg-white);
    }
    
    td {
        display: block;
        text-align: left !important;
        padding: 0.5rem 0 !important;
        border: none !important;
    }
    
    td:before {
        content: attr(data-label);
        font-weight: 600;
        display: block;
        margin-bottom: 0.25rem;
        color: var(--text-dark);
    }
    
    /* Module accordions */
    .module-item {
        padding: 1rem;
    }
    
    .module-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
    
    /* Certificates */
    .certificate {
        padding: 2rem 1rem;
    }
    
    .certificate h1 {
        font-size: 1.5rem;
    }
    
    .certificate h2 {
        font-size: 1.25rem;
    }
}

/* Small mobile - 480px */
@media (max-width: 480px) {
    .container {
        padding-left: 1rem;
        padding-right: 1rem;
    }
    
    .hero {
        padding: 2rem 0;
    }
    
    .hero-title {
        font-size: 1.75rem;
    }
    
    .section-title {
        font-size: 1.5rem;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .nav-menu {
        width: 100%;
        max-width: 100%;
        padding: 1.5rem;
    }
    
    .logo-text-sub {
        display: none;
    }
    
    .lesson-main {
        padding: 1rem;
    }
    
    .quiz-option {
        font-size: 0.875rem;
    }
    
    .stat-card {
        padding: 0.75rem;
    }
    
    .module-item {
        padding: 0.75rem;
    }
    
    .certificate {
        padding: 1.5rem 0.75rem;
        font-size: 0.875rem;
    }
}

@media print {
    @page {
        margin: 1cm;
    }
    
    body {
        background: var(--bg-white);
    }
}