:root {
    --color-primary: #1F3864;
    --color-primary-mid: #2E75B6;
    --color-primary-light: #D6E4F0;
    --color-accent: #00B0A0;
    --color-accent-light: #E0F5F3;
    --color-amber: #F57F17;
    --color-amber-light: #FFF8E1;
    --color-success: #2E7D32;
    --color-success-light: #E8F5E9;
    --color-danger: #C62828;
    --color-danger-light: #FFEBEE;
    --color-surface: #F8F9FA;
    --color-border: #E2E8F0;
    --color-text-main: #1A202C;
    --color-text-muted: #64748B;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.10);
    --navbar-height: 68px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'DM Sans', sans-serif;
    font-size: 16px;
    color: var(--color-text-main);
    background: #fff;
    line-height: 1.6;
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Sora', sans-serif;
    line-height: 1.25;
    color: var(--color-text-main);
}

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

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

img {
    max-width: 100%;
    display: block;
}

ul {
    list-style: none;
}

.container {
    max-width: 1180px;
    margin: 0 auto;
    padding: 0 24px;
}

.page-wrapper {
    min-height: calc(100vh - var(--navbar-height) - 80px);
    padding-bottom: 60px;
}

.navbar {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: #fff;
    border-bottom: 1px solid var(--color-border);
    height: var(--navbar-height);
    box-shadow: var(--shadow-sm);
    transition: box-shadow 0.3s ease, height 0.3s ease;
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
    height: 56px;
}

.navbar-inner {
    max-width: 1180px;
    margin: 0 auto;
    padding: 0 24px;
    height: 100%;
    display: flex;
    align-items: center;
    gap: 32px;
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: 'Sora', sans-serif;
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--color-primary);
    text-decoration: none;
    flex-shrink: 0;
}

.navbar-brand:hover {
    color: var(--color-primary-mid);
}

.brand-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    background: var(--color-primary);
    color: #fff;
    font-family: 'Sora', sans-serif;
    font-weight: 800;
    font-size: 1rem;
    border-radius: var(--radius-sm);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 4px;
    margin-left: auto;
    list-style: none;
}

.nav-links li a {
    display: block;
    padding: 6px 14px;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-text-main);
    border-radius: var(--radius-sm);
    transition: background 0.2s, color 0.2s;
}

.nav-links li a:hover,
.nav-links li a.active {
    background: var(--color-primary-light);
    color: var(--color-primary);
}

.cart-link {
    position: relative;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.cart-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 18px;
    height: 18px;
    overflow: hidden;
    background: var(--color-accent);
    color: #fff;
    font-size: 0.7rem;
    font-weight: 700;
    border-radius: 999px;
}

.btn-nav {
    padding: 7px 18px !important;
    border-radius: var(--radius-sm) !important;
    font-weight: 600 !important;
    border: 1.5px solid var(--color-primary);
    color: var(--color-primary) !important;
    background: transparent;
}

.btn-nav:hover {
    background: var(--color-primary-light) !important;
}

.btn-nav-accent {
    background: var(--color-accent) !important;
    color: #fff !important;
    border-color: var(--color-accent) !important;
}

.btn-nav-accent:hover {
    background: #009b8c !important;
}

.nav-user {
    position: relative;
}

.user-avatar-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 6px 10px;
    border-radius: var(--radius-sm);
    font-family: 'DM Sans', sans-serif;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-text-main);
    transition: background 0.2s;
}

.user-avatar-btn:hover {
    background: var(--color-surface);
}

.user-avatar-circle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    background: var(--color-primary);
    color: #fff;
    font-family: 'Sora', sans-serif;
    font-weight: 700;
    font-size: 0.9rem;
    border-radius: 50%;
}

.dropdown-caret {
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

.user-dropdown {
    display: none;
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    min-width: 200px;
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    z-index: 200;
}

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

.dropdown-header {
    padding: 12px 16px;
    border-bottom: 1px solid var(--color-border);
    background: var(--color-surface);
}

.dropdown-header strong {
    display: block;
    font-size: 0.9rem;
    color: var(--color-text-main);
}

.dropdown-header small {
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

.user-dropdown a {
    display: block;
    padding: 10px 16px;
    font-size: 0.9rem;
    color: var(--color-text-main);
    transition: background 0.15s;
}

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

.dropdown-logout {
    width: 100%;
    text-align: left;
    padding: 10px 16px;
    font-size: 0.9rem;
    color: var(--color-danger);
    background: none;
    border: none;
    cursor: pointer;
    font-family: 'DM Sans', sans-serif;
    transition: background 0.15s;
}

.dropdown-logout:hover {
    background: var(--color-danger-light);
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 6px;
    margin-left: auto;
}

.hamburger span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text-main);
    border-radius: 2px;
    transition: all 0.3s;
}

.alert {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 14px 20px;
    margin: 16px auto;
    max-width: 1180px;
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    font-weight: 500;
    transition: opacity 0.4s ease;
}

.alert-success {
    background: var(--color-success-light);
    color: var(--color-success);
    border: 1px solid #a5d6a7;
}

.alert-error {
    background: var(--color-danger-light);
    color: var(--color-danger);
    border: 1px solid #ef9a9a;
}

.alert-info {
    background: var(--color-primary-light);
    color: var(--color-primary);
    border: 1px solid #90caf9;
}

.alert-close {
    background: none;
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    color: inherit;
    opacity: 0.7;
    line-height: 1;
    padding: 0 4px;
}

.alert-close:hover {
    opacity: 1;
}

.alert.fade-out {
    opacity: 0;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 22px;
    font-family: 'DM Sans', sans-serif;
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    border: 1.5px solid transparent;
    cursor: pointer;
    transition: background 0.2s, border-color 0.2s, transform 0.1s;
    text-decoration: none;
    line-height: 1;
}

.btn:active {
    transform: scale(0.98);
}

.btn-primary {
    background: var(--color-primary);
    color: #fff;
    border-color: var(--color-primary);
}

.btn-primary:hover {
    background: var(--color-primary-mid);
    border-color: var(--color-primary-mid);
    color: #fff;
}

.btn-accent {
    background: var(--color-accent);
    color: #fff;
    border-color: var(--color-accent);
}

.btn-accent:hover {
    background: #009b8c;
    border-color: #009b8c;
    color: #fff;
}

.btn-outline {
    background: transparent;
    color: var(--color-primary);
    border-color: var(--color-primary);
}

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

.btn-sm {
    padding: 6px 14px;
    font-size: 0.85rem;
}

.btn-lg {
    padding: 14px 32px;
    font-size: 1.05rem;
}

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

.mt-sm { margin-top: 10px; }
.mt-md { margin-top: 20px; }
.mt-lg { margin-top: 32px; }

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

.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-text-main);
    margin-bottom: 6px;
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: 10px 14px;
    font-family: 'DM Sans', sans-serif;
    font-size: 0.95rem;
    color: var(--color-text-main);
    background: #fff;
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius-sm);
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
    appearance: none;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    border-color: var(--color-primary-mid);
    box-shadow: 0 0 0 3px rgba(46,117,182,0.12);
}

.form-input.is-error,
.form-select.is-error,
.form-textarea.is-error {
    border-color: var(--color-danger);
}

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

.form-input-file {
    width: 100%;
    padding: 8px;
    font-size: 0.9rem;
    color: var(--color-text-muted);
    border: 1.5px dashed var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--color-surface);
    cursor: pointer;
}

.form-checkbox {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.field-error {
    display: block;
    margin-top: 5px;
    font-size: 0.8rem;
    color: var(--color-danger);
}

.char-count {
    display: block;
    font-size: 0.8rem;
    color: var(--color-text-muted);
    margin-top: 4px;
    text-align: right;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.page-header {
    background: var(--color-primary);
    color: #fff;
    padding: 40px 0;
    margin-bottom: 40px;
}

.page-title {
    font-size: 2rem;
    font-weight: 800;
    color: #fff;
}

.page-subtitle {
    color: rgba(255,255,255,0.75);
    margin-top: 6px;
    font-size: 1rem;
}

.hero {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-mid) 100%);
    color: #fff;
    padding: 80px 0;
}

.hero-inner {
    max-width: 1180px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    gap: 60px;
}

.hero-text {
    flex: 1;
}

.hero-title {
    font-size: 2.8rem;
    font-weight: 800;
    color: #fff;
    line-height: 1.15;
    margin-bottom: 20px;
}

.hero-title .highlight {
    color: #7ee8e3;
}

.hero-subtitle {
    font-size: 1.1rem;
    color: rgba(255,255,255,0.82);
    margin-bottom: 32px;
    max-width: 520px;
    line-height: 1.7;
}

.hero-actions {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
    margin-bottom: 40px;
}

.hero-stats {
    display: flex;
    gap: 36px;
}

.hero-stat strong {
    display: block;
    font-family: 'Sora', sans-serif;
    font-size: 1.6rem;
    font-weight: 700;
    color: #fff;
}

.hero-stat span {
    font-size: 0.85rem;
    color: rgba(255,255,255,0.65);
}

.hero-image {
    flex-shrink: 0;
    width: 420px;
}

.hero-image img {
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.categories-section,
.courses-section,
.cta-section {
    padding: 60px 0;
}

.categories-section {
    background: var(--color-surface);
}

.section-header {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    margin-bottom: 32px;
    flex-wrap: wrap;
    gap: 12px;
}

.section-title {
    font-size: 1.7rem;
    font-weight: 700;
    color: var(--color-text-main);
}

.section-subtitle {
    color: var(--color-text-muted);
    margin-top: 4px;
    font-size: 0.95rem;
}

.section-link {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-primary-mid);
}

.categories-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.category-chip {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: #fff;
    border: 1.5px solid var(--color-border);
    border-radius: 999px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text-main);
    transition: border-color 0.2s, background 0.2s;
    text-decoration: none;
}

.category-chip:hover {
    border-color: var(--color-primary-mid);
    background: var(--color-primary-light);
    color: var(--color-primary);
}

.category-icon {
    font-size: 1.1rem;
}

.courses-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.course-card {
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: box-shadow 0.25s, transform 0.25s;
    display: flex;
    flex-direction: column;
}

.course-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-3px);
}

.course-card-thumb-link {
    position: relative;
    display: block;
    overflow: hidden;
}

.course-card-thumb {
    width: 100%;
    height: 180px;
    object-fit: cover;
    transition: transform 0.3s;
}

.course-card:hover .course-card-thumb {
    transform: scale(1.04);
}

.course-level-badge {
    position: absolute;
    top: 10px;
    left: 10px;
    padding: 3px 10px;
    font-size: 0.72rem;
    font-weight: 700;
    border-radius: 999px;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

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

.badge-intermediate {
    background: var(--color-amber-light);
    color: var(--color-amber);
}

.badge-advanced {
    background: var(--color-danger-light);
    color: var(--color-danger);
}

.course-card-body {
    padding: 18px;
    display: flex;
    flex-direction: column;
    flex: 1;
}

.course-category-tag {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-primary-mid);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 8px;
}

.course-card-title {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 6px;
    line-height: 1.35;
}

.course-card-title a {
    color: var(--color-text-main);
    text-decoration: none;
}

.course-card-title a:hover {
    color: var(--color-primary-mid);
}

.course-card-instructor {
    font-size: 0.82rem;
    color: var(--color-text-muted);
    margin-bottom: 12px;
}

.course-card-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 14px;
    flex-wrap: wrap;
}

.enrolled-count {
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

.course-card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: auto;
    padding-top: 14px;
    border-top: 1px solid var(--color-border);
}

.course-price {
    font-family: 'Sora', sans-serif;
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--color-primary);
}

.course-price.free {
    color: var(--color-success);
}

.star-rating {
    display: inline-flex;
    align-items: center;
    gap: 5px;
}

.stars-outer {
    position: relative;
    display: inline-block;
    font-size: 1rem;
    color: #ddd;
    letter-spacing: 2px;
}

.stars-outer::before {
    content: '★★★★★';
}

.stars-inner {
    position: absolute;
    top: 0;
    left: 0;
    white-space: nowrap;
    overflow: hidden;
    width: calc(var(--score) / 5 * 100%);
    color: var(--color-amber);
}

.stars-inner::before {
    content: '★★★★★';
}

.rating-value {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-amber);
}

.cta-box {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
    color: #fff;
    padding: 60px;
    border-radius: var(--radius-lg);
    text-align: center;
}

.cta-box h2 {
    font-size: 2rem;
    font-weight: 800;
    color: #fff;
    margin-bottom: 12px;
}

.cta-box p {
    color: rgba(255,255,255,0.82);
    margin-bottom: 28px;
    font-size: 1.05rem;
}

.courses-layout {
    display: grid;
    grid-template-columns: 260px 1fr;
    gap: 32px;
    padding: 0 0 60px;
}

.filter-sidebar {
    position: sticky;
    top: calc(var(--navbar-height) + 20px);
    height: fit-content;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 24px;
}

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

.filter-label {
    display: block;
    font-size: 0.82rem;
    font-weight: 700;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 8px;
}

.filter-select {
    cursor: pointer;
}

.btn-block {
    width: 100%;
    justify-content: center;
}

.courses-toolbar {
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.results-count {
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.empty-state-box {
    padding: 60px 20px;
    text-align: center;
    color: var(--color-text-muted);
    background: var(--color-surface);
    border-radius: var(--radius-md);
    border: 1px dashed var(--color-border);
}

.empty-state {
    color: var(--color-text-muted);
    padding: 40px 0;
    text-align: center;
}

.pagination-wrapper {
    margin-top: 40px;
    display: flex;
    justify-content: center;
}

.pagination-wrapper nav {
    display: flex;
    gap: 4px;
}

.course-show-hero {
    background: var(--color-primary);
    padding: 48px 0;
    margin-bottom: 40px;
}

.course-show-header {
    display: grid;
    grid-template-columns: 1fr 340px;
    gap: 40px;
    align-items: start;
}

.course-show-info {
    color: #fff;
}

.course-show-title {
    font-size: 2rem;
    font-weight: 800;
    color: #fff;
    margin: 10px 0 14px;
    line-height: 1.2;
}

.course-show-desc {
    color: rgba(255,255,255,0.82);
    font-size: 1rem;
    margin-bottom: 18px;
    line-height: 1.65;
}

.course-show-meta {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 14px;
    color: rgba(255,255,255,0.75);
    font-size: 0.9rem;
}

.meta-sep {
    color: rgba(255,255,255,0.4);
}

.course-instructor-line {
    color: rgba(255,255,255,0.75);
    font-size: 0.9rem;
}

.course-show-card {
    background: #fff;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.course-show-thumb {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.course-show-card-body {
    padding: 20px;
}

.course-show-price {
    font-family: 'Sora', sans-serif;
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--color-primary);
    margin-bottom: 16px;
}

.course-show-price.free {
    color: var(--color-success);
}

.course-show-actions {
    margin-bottom: 16px;
}

.btn-add-cart {
    cursor: pointer;
}

.course-includes {
    list-style: none;
    padding: 0;
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.course-includes li {
    padding: 6px 0;
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    gap: 8px;
}

.course-includes li:last-child {
    border-bottom: none;
}

.course-show-body {
    padding-bottom: 60px;
}

.section-heading {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 16px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--color-border);
}

.section-note {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    margin-bottom: 16px;
}

.curriculum-section {
    margin-bottom: 48px;
}

.curriculum-list {
    list-style: none;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.curriculum-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 18px;
    border-bottom: 1px solid var(--color-border);
    font-size: 0.95rem;
    background: #fff;
    transition: background 0.15s;
}

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

.curriculum-item:hover {
    background: var(--color-surface);
}

.curriculum-lock {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    flex-shrink: 0;
}

.curriculum-number {
    font-weight: 600;
    color: var(--color-text-muted);
    font-size: 0.85rem;
    flex-shrink: 0;
    min-width: 22px;
}

.curriculum-title {
    color: var(--color-text-main);
}

.instructor-section {
    margin-bottom: 40px;
}

.instructor-card {
    display: flex;
    gap: 20px;
    padding: 24px;
    background: var(--color-surface);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
}

.instructor-avatar {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--color-primary);
    color: #fff;
    font-family: 'Sora', sans-serif;
    font-size: 1.5rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.instructor-info h3 {
    font-size: 1.05rem;
    margin-bottom: 4px;
}

.instructor-info p {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.instructor-bio {
    margin-top: 8px !important;
}

.cart-layout {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 32px;
    padding-bottom: 60px;
}

.cart-heading {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--color-text-muted);
}

.cart-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 18px 0;
    border-bottom: 1px solid var(--color-border);
}

.cart-item-thumb {
    width: 120px;
    height: 80px;
    object-fit: cover;
    border-radius: var(--radius-sm);
    flex-shrink: 0;
}

.cart-item-info {
    flex: 1;
}

.cart-item-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.cart-item-title a {
    color: var(--color-text-main);
}

.cart-item-instructor {
    font-size: 0.82rem;
    color: var(--color-text-muted);
    margin-bottom: 6px;
}

.cart-item-price .price {
    font-family: 'Sora', sans-serif;
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--color-primary);
    white-space: nowrap;
}

.cart-item-price .price.free {
    color: var(--color-success);
}

.btn-remove-cart {
    background: none;
    border: 1px solid var(--color-border);
    color: var(--color-danger);
    width: 30px;
    height: 30px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 0.8rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s;
    flex-shrink: 0;
}

.btn-remove-cart:hover {
    background: var(--color-danger-light);
}

.cart-summary {
    position: sticky;
    top: calc(var(--navbar-height) + 20px);
    height: fit-content;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 24px;
}

.cart-summary-title {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--color-border);
}

.cart-summary-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 0;
    font-size: 0.95rem;
    border-bottom: 1px solid var(--color-border);
}

.cart-summary-row.total {
    border-bottom: none;
    padding-top: 14px;
    font-size: 1.05rem;
}

.empty-cart {
    text-align: center;
    padding: 80px 20px;
}

.empty-cart-icon {
    font-size: 4rem;
    margin-bottom: 20px;
}

.empty-cart h2 {
    margin-bottom: 10px;
}

.empty-cart p {
    color: var(--color-text-muted);
    margin-bottom: 24px;
}

.checkout-layout {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 32px;
    padding-bottom: 60px;
}

.checkout-form-section {
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 32px;
}

.bkash-header {
    background: #f72585;
    color: #fff;
    padding: 20px 24px;
    border-radius: var(--radius-md);
    margin-bottom: 28px;
}

.bkash-logo {
    font-family: 'Sora', sans-serif;
    font-size: 1.6rem;
    font-weight: 800;
    margin-bottom: 8px;
    letter-spacing: -0.5px;
}

.bkash-header p {
    font-size: 0.92rem;
    color: rgba(255,255,255,0.9);
}

.bkash-note {
    margin-top: 6px;
    font-size: 0.82rem !important;
    color: rgba(255,255,255,0.75) !important;
}

.checkout-total {
    display: flex;
    justify-content: space-evenly;
    align-items: center;
    padding: 14px 0;
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
    margin-bottom: 20px;
    font-size: 1rem;
}

.checkout-total strong {
    font-family: 'Sora', sans-serif;
    font-size: 1.3rem;
    color: var(--color-primary);
}

.checkout-summary {
    position: sticky;
    top: calc(var(--navbar-height) + 20px);
    height: fit-content;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 24px;
}

.summary-title {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--color-border);
}

.summary-item {
    display: flex;
    gap: 12px;
    padding: 12px 0;
    border-bottom: 1px solid var(--color-border);
}

.summary-thumb {
    width: 60px;
    height: 40px;
    object-fit: cover;
    border-radius: var(--radius-sm);
    flex-shrink: 0;
}

.summary-item-title {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-text-main);
    line-height: 1.35;
}

.summary-item-price {
    font-size: 0.82rem;
    color: var(--color-text-muted);
    margin-top: 3px;
}

.summary-total {
    display: flex;
    justify-content: space-between;
    padding-top: 14px;
    font-size: 1rem;
}

.confirmation-box {
    max-width: 560px;
    margin: 60px auto;
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 48px;
    text-align: center;
    box-shadow: var(--shadow-md);
}

.confirmation-icon {
    font-size: 3.5rem;
    margin-bottom: 16px;
}

.confirmation-title {
    font-size: 1.8rem;
    font-weight: 800;
    margin-bottom: 10px;
    color: var(--color-success);
}

.confirmation-subtitle {
    color: var(--color-text-muted);
    margin-bottom: 32px;
}

.confirmation-details {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    margin-bottom: 24px;
    text-align: left;
}

.confirmation-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 18px;
    border-bottom: 1px solid var(--color-border);
    font-size: 0.9rem;
}

.confirmation-row:last-child {
    border-bottom: none;
}

.conf-label {
    color: var(--color-text-muted);
    font-weight: 500;
}

.conf-value {
    font-weight: 600;
    color: var(--color-text-main);
}

.transaction-number {
    font-family: monospace;
    font-size: 0.95rem;
    background: var(--color-primary-light);
    padding: 2px 8px;
    border-radius: var(--radius-sm);
    color: var(--color-primary);
}

.confirmation-note {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    margin-bottom: 28px;
    line-height: 1.6;
}

.confirmation-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

.status-badge {
    display: inline-block;
    padding: 3px 12px;
    border-radius: 999px;
    font-size: 0.78rem;
    font-weight: 700;
    text-transform: capitalize;
}

.status-pending {
    background: var(--color-amber-light);
    color: var(--color-amber);
}

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

.status-failed {
    background: var(--color-danger-light);
    color: var(--color-danger);
}

.badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 700;
}

.dashboard-layout {
    display: grid;
    grid-template-columns: 220px 1fr;
    min-height: calc(100vh - var(--navbar-height));
}

.dashboard-sidebar {
    background: var(--color-primary);
    padding: 32px 0;
    position: sticky;
    top: var(--navbar-height);
    height: calc(100vh - var(--navbar-height));
    overflow-y: auto;
}

.dash-nav {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 0 12px;
}

.dash-nav-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    color: rgba(255,255,255,0.72);
    font-size: 0.95rem;
    font-weight: 500;
    border-radius: var(--radius-sm);
    text-decoration: none;
    transition: background 0.2s, color 0.2s;
}

.dash-nav-link:hover,
.dash-nav-link.active {
    background: rgba(255,255,255,0.15);
    color: #fff;
}

.dash-nav-icon {
    font-size: 1.1rem;
}

.dashboard-main {
    padding: 36px 40px;
    background: var(--color-surface);
}

.dash-header {
    margin-bottom: 28px;
}

.dash-title {
    font-size: 1.8rem;
    font-weight: 800;
}

.dash-subtitle {
    color: var(--color-text-muted);
    margin-top: 4px;
}

.stat-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-bottom: 40px;
}

.stat-card {
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 24px;
    display: flex;
    align-items: center;
    gap: 16px;
    box-shadow: var(--shadow-sm);
}

.stat-icon {
    font-size: 2rem;
    flex-shrink: 0;
}

.stat-number {
    font-family: 'Sora', sans-serif;
    font-size: 2rem;
    font-weight: 800;
    color: var(--color-primary);
    line-height: 1;
}

.stat-label {
    font-size: 0.82rem;
    color: var(--color-text-muted);
    margin-top: 4px;
    font-weight: 500;
}

.dash-section {
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 28px;
    margin-bottom: 32px;
    box-shadow: var(--shadow-sm);
}

.dash-section.hidden {
    display: none;
}

.dash-section-title {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--color-border);
}

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

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.data-table th {
    background: var(--color-surface);
    padding: 12px 14px;
    text-align: left;
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-bottom: 2px solid var(--color-border);
    white-space: nowrap;
}

.data-table td {
    padding: 14px;
    border-bottom: 1px solid var(--color-border);
    color: var(--color-text-main);
    vertical-align: middle;
}

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

.data-table tr:hover td {
    background: var(--color-surface);
}

.empty-row {
    text-align: center;
    color: var(--color-text-muted);
    padding: 40px !important;
}

.role-badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 700;
}

.role-admin {
    background: var(--color-primary-light);
    color: var(--color-primary);
}

.role-student {
    background: var(--color-accent-light);
    color: var(--color-accent);
}

.upload-form-box {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 24px;
    margin-bottom: 28px;
}

.upload-form-title {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--color-primary);
}

.auth-wrapper {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: calc(100vh - var(--navbar-height) - 80px);
    padding: 40px 20px;
}

.auth-card {
    width: 100%;
    max-width: 440px;
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 40px;
    box-shadow: var(--shadow-md);
}

.auth-header {
    text-align: center;
    margin-bottom: 32px;
}

.auth-brand {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-family: 'Sora', sans-serif;
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-primary);
    text-decoration: none;
    margin-bottom: 20px;
}

.auth-title {
    font-size: 1.6rem;
    font-weight: 800;
    margin-bottom: 6px;
}

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

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

.auth-footer-text {
    text-align: center;
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.site-footer {
    background: var(--color-primary);
    color: rgba(255,255,255,0.72);
    padding: 28px 0;
}

.footer-inner {
    max-width: 1180px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 16px;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: 'Sora', sans-serif;
    font-weight: 700;
    font-size: 1.1rem;
    color: #fff;
}

.footer-copy {
    font-size: 0.85rem;
    color: rgba(255,255,255,0.55);
}

.footer-links {
    display: flex;
    gap: 20px;
}

.footer-links a {
    font-size: 0.875rem;
    color: rgba(255,255,255,0.65);
    text-decoration: none;
    transition: color 0.2s;
}

.footer-links a:hover {
    color: #fff;
}

@media (max-width: 1024px) {
    .courses-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .hero-image {
        width: 300px;
    }

    .hero-title {
        font-size: 2.2rem;
    }

    .course-show-header {
        grid-template-columns: 1fr;
    }

    .course-show-card {
        max-width: 400px;
    }

    .checkout-layout,
    .cart-layout {
        grid-template-columns: 1fr;
    }

    .dashboard-layout {
        grid-template-columns: 1fr;
    }

    .dashboard-sidebar {
        position: static;
        height: auto;
        padding: 16px;
    }

    .dash-nav {
        flex-direction: row;
        flex-wrap: wrap;
    }

    .stat-cards {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: var(--navbar-height);
        left: 0;
        right: 0;
        background: #fff;
        border-bottom: 1px solid var(--color-border);
        flex-direction: column;
        padding: 16px;
        gap: 4px;
        box-shadow: var(--shadow-md);
        z-index: 999;
    }

    .nav-links.open {
        display: flex;
    }

    .nav-links li {
        width: 100%;
    }

    .nav-links li a {
        width: 100%;
        padding: 12px 16px;
    }

    .hero-inner {
        flex-direction: column;
        text-align: center;
    }

    .hero-image {
        width: 100%;
    }

    .hero-stats {
        justify-content: center;
    }

    .hero-actions {
        justify-content: center;
    }

    .courses-grid {
        grid-template-columns: 1fr;
    }

    .courses-layout {
        grid-template-columns: 1fr;
    }

    .filter-sidebar {
        position: static;
    }

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

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

    .section-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .cta-box {
        padding: 40px 24px;
    }

    .dashboard-main {
        padding: 24px 16px;
    }

    .footer-inner {
        flex-direction: column;
        text-align: center;
    }

    .footer-links {
        justify-content: center;
    }
}

/* ─────────────────────────────────────────────────────────────
   Role Badges
───────────────────────────────────────────────────────────── */
.role-badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.role-admin {
    background: #fce4ec;
    color: #c62828;
}

.role-instructor {
    background: #e8eaf6;
    color: #3949ab;
}

.role-student {
    background: var(--color-success-light);
    color: var(--color-success);
}

/* ─────────────────────────────────────────────────────────────
   Transaction Number Monospace
───────────────────────────────────────────────────────────── */
.transaction-number {
    font-family: 'Courier New', monospace;
    font-size: 0.85rem;
    color: var(--color-text-muted);
    letter-spacing: 0.05em;
}

/* ─────────────────────────────────────────────────────────────
   AI Content Generator Box
───────────────────────────────────────────────────────────── */
.ai-generator-box {
    background: linear-gradient(135deg, #f0f4ff 0%, #e8f5f3 100%);
    border: 1.5px solid #c5d8f5;
    border-radius: var(--radius-lg);
    padding: 24px;
    margin-bottom: 28px;
}

.ai-generator-header {
    margin-bottom: 16px;
}

.ai-badge {
    display: inline-block;
    background: var(--color-primary);
    color: #fff;
    font-size: 0.72rem;
    font-weight: 700;
    padding: 3px 10px;
    border-radius: 999px;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 8px;
}

.ai-generator-header h4 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 4px;
}

.ai-generator-header p {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.ai-generator-controls {
    display: grid;
    grid-template-columns: 1fr 1fr auto;
    gap: 12px;
    align-items: end;
}

.ai-status {
    margin-top: 12px;
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 500;
}

.ai-status-success {
    background: var(--color-success-light);
    color: var(--color-success);
    border: 1px solid #a5d6a7;
}

.ai-status-error {
    background: var(--color-danger-light);
    color: var(--color-danger);
    border: 1px solid #ef9a9a;
}

.ai-status-info {
    background: var(--color-primary-light);
    color: var(--color-primary);
    border: 1px solid #90caf9;
}

@media (max-width: 768px) {
    .ai-generator-controls {
        grid-template-columns: 1fr;
    }
}