:root {
    --ud-bg: #f7f9fa;
    --ud-surface: #ffffff;
    --ud-surface-alt: #f0f2f5;
    --ud-border: #d1d7dc;
    --ud-border-strong: #aeb5bb;
    --ud-text: #1c1d1f;
    --ud-text-muted: #6a6f73;
    --ud-primary: #5624d0;
    --ud-primary-dark: #401b9c;
    --ud-accent: #a435f0;
    --ud-success: #2d8659;
    --ud-danger: #b32d0f;
    --ud-warning: #c27803;
    --ud-radius: 14px;
    --ud-radius-sm: 10px;
    --ud-radius-xs: 8px;
    --ud-shadow: 0 22px 45px rgba(28, 29, 31, 0.09);
    --ud-shadow-soft: 0 14px 34px rgba(28, 29, 31, 0.06);
    --ud-shadow-subtle: 0 6px 18px rgba(28, 29, 31, 0.05);
    --transition: 0.25s ease;
    --font-body: 'Inter', 'Helvetica Neue', Arial, sans-serif;
}

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

html,
body {
    margin: 0;
    padding: 0;
    font-family: var(--font-body);
    color: var(--ud-text);
    background: var(--ud-bg);
    -webkit-font-smoothing: antialiased;
}

a {
    color: inherit;
    text-decoration: none;
}

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

.container {
    width: min(1180px, calc(100% - 48px));
    margin: 0 auto;
}

.course-app {
    background: var(--ud-bg);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    gap: 0;
}

.course-main {
    padding: 56px 0 96px;
}

.course-hero {
    background: linear-gradient(135deg, #f7f9fa 0%, #ebe6ff 40%, #f8f0ff 100%);
    padding: 88px 0 72px;
    position: relative;
    overflow: hidden;
}

.course-hero::after {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 20% 20%, rgba(164, 53, 240, 0.12), transparent 55%),
                radial-gradient(circle at 80% 30%, rgba(86, 36, 208, 0.12), transparent 50%);
    pointer-events: none;
}

.course-hero__inner {
    position: relative;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 64px;
    flex-wrap: wrap;
}

.course-hero__copy {
    flex: 1 1 460px;
    max-width: 580px;
}

.course-hero__eyebrow {
    display: inline-block;
    font-size: 0.78rem;
    letter-spacing: 0.24em;
    text-transform: uppercase;
    font-weight: 700;
    color: var(--ud-accent);
    margin-bottom: 16px;
}

.course-hero__title {
    font-size: clamp(2.6rem, 5vw, 3.6rem);
    line-height: 1.12;
    margin: 0 0 16px;
    color: var(--ud-text);
}

.course-hero__subtitle {
    font-size: clamp(1.05rem, 2.6vw, 1.25rem);
    line-height: 1.7;
    color: var(--ud-text-muted);
    max-width: 520px;
    margin: 0 0 28px;
}

.course-hero__actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.ud-button,
.btn-primary,
.btn-secondary,
.process-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 0.85rem 1.6rem;
    border-radius: var(--ud-radius-sm);
    font-weight: 600;
    cursor: pointer;
    border: 1px solid transparent;
    transition: var(--transition);
    font-size: 0.98rem;
    line-height: 1.2;
    text-transform: none;
}

.ud-button i,
.btn-primary i,
.btn-secondary i,
.process-button i {
    font-size: 1rem;
}

.ud-button--primary,
.btn-primary,
.process-button {
    background: var(--ud-primary);
    color: #fff;
    border-color: var(--ud-primary);
    box-shadow: var(--ud-shadow-subtle);
}

.ud-button--primary:hover,
.btn-primary:hover,
.process-button:hover {
    background: var(--ud-primary-dark);
    border-color: var(--ud-primary-dark);
}

.ud-button--ghost,
.btn-secondary {
    background: #fff;
    color: var(--ud-primary);
    border-color: var(--ud-primary);
}

.ud-button--ghost:hover,
.btn-secondary:hover {
    background: rgba(86, 36, 208, 0.08);
}

.process-button--small {
    padding: 0.65rem 1.1rem;
    font-size: 0.9rem;
}

.course-lock-banner {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    border: 1px solid var(--ud-border);
    border-radius: var(--ud-radius);
    padding: 1.5rem 1.75rem;
    background: #fff;
    box-shadow: var(--ud-shadow-subtle);
    margin: 1.5rem 0;
}

.course-lock-banner__icon {
    flex: 0 0 auto;
    width: 3rem;
    height: 3rem;
    border-radius: 999px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(86, 36, 208, 0.1);
    color: var(--ud-primary);
    font-size: 1.4rem;
}

.course-lock-banner__body {
    flex: 1 1 auto;
    display: flex;
    flex-direction: column;
    gap: 0.65rem;
}

.course-lock-banner__body h3 {
    margin: 0;
    font-size: 1.3rem;
}

.course-lock-banner__body p {
    margin: 0;
    color: var(--ud-text-muted);
    line-height: 1.55;
}

.course-lock-banner__actions {
    flex: 0 0 auto;
}

.course-lock-banner--attention {
    border-color: var(--ud-accent);
    box-shadow: 0 18px 32px rgba(164, 53, 240, 0.18);
    animation: courseLockPulse 1.4s ease-out;
}

@keyframes courseLockPulse {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.01);
    }
    100% {
        transform: scale(1);
    }
}

.subscription-options[hidden] {
    display: none !important;
}

.subscription-options {
    border: 1px dashed var(--ud-border);
    border-radius: var(--ud-radius);
    padding: 1.5rem 1.75rem;
    background: var(--ud-surface-alt);
    margin: 1.5rem 0 2rem;
    transition: box-shadow var(--transition), border-color var(--transition);
}

.subscription-options--visible {
    border-color: var(--ud-primary);
    box-shadow: var(--ud-shadow-soft);
}

.subscription-options h4 {
    margin: 0 0 1rem;
    font-size: 1.2rem;
}

.subscription-options__grid {
    display: grid;
    gap: 1.25rem;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.subscription-option {
    background: #fff;
    border-radius: var(--ud-radius-sm);
    border: 1px solid var(--ud-border);
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
    box-shadow: var(--ud-shadow-subtle);
}

.subscription-option__icon {
    width: 2.75rem;
    height: 2.75rem;
    border-radius: 999px;
    background: rgba(86, 36, 208, 0.12);
    color: var(--ud-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
}

.subscription-option[data-method="paypal"] .subscription-option__icon {
    background: rgba(18, 94, 209, 0.12);
    color: #125ed1;
}

.subscription-option__body h5 {
    margin: 0;
    font-size: 1.05rem;
}

.subscription-option__body p {
    margin: 0;
    color: var(--ud-text-muted);
    line-height: 1.5;
}

.subscription-option__cta {
    align-self: flex-start;
    margin-top: auto;
    text-decoration: none;
}

.subscription-options__note {
    margin: 1.25rem 0 0;
    font-size: 0.95rem;
    color: var(--ud-text-muted);
}

.subscription-options__feedback {
    margin-top: 0.75rem;
    font-size: 0.95rem;
    color: var(--ud-success);
}

.subscription-options__feedback--error {
    color: var(--ud-danger);
}

.subscription-option__cta.is-loading {
    pointer-events: none;
    opacity: 0.7;
    position: relative;
}

.subscription-option__cta.is-loading::after {
    content: '';
    width: 1rem;
    height: 1rem;
    border: 2px solid currentColor;
    border-top-color: transparent;
    border-radius: 50%;
    animation: courseLoadingSpin 0.75s linear infinite;
    position: absolute;
    right: 0.9rem;
    top: 50%;
    transform: translateY(-50%);
}

@keyframes courseLoadingSpin {
    from { transform: translateY(-50%) rotate(0deg); }
    to { transform: translateY(-50%) rotate(360deg); }
}

.video-attachments--locked {
    border: 1px dashed var(--ud-border);
    border-radius: var(--ud-radius-xs);
    padding: 1rem;
    background: var(--ud-surface-alt);
    color: var(--ud-text-muted);
}

.video-attachments--locked .video-attachments__header {
    color: var(--ud-text);
}

.video-attachments__locked-message {
    margin: 0.5rem 0 0;
    font-size: 0.9rem;
    line-height: 1.5;
}

@media (max-width: 640px) {
    .course-lock-banner {
        flex-direction: column;
        align-items: flex-start;
    }

    .course-lock-banner__actions {
        width: 100%;
        display: flex;
        justify-content: flex-start;
    }

    .subscription-options__grid {
        grid-template-columns: 1fr;
    }
}

.ud-button--danger,
.btn-danger {
    background: var(--ud-danger);
    color: #fff;
    border-color: var(--ud-danger);
}

.ud-button--danger:hover,
.btn-danger:hover {
    background: #8d230b;
}

.btn-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--ud-surface);
    border: 1px solid var(--ud-border);
    color: var(--ud-text-muted);
    cursor: pointer;
    transition: var(--transition);
}

.btn-icon:hover {
    color: var(--ud-primary);
    border-color: var(--ud-primary);
    background: rgba(86, 36, 208, 0.1);
}

.course-hero__visual {
    flex: 1 1 260px;
    max-width: 340px;
    background: var(--ud-surface);
    padding: 28px;
    border-radius: var(--ud-radius);
    box-shadow: var(--ud-shadow);
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.course-hero__badge {
    display: flex;
    align-items: center;
    gap: 14px;
    background: rgba(86, 36, 208, 0.08);
    border-radius: var(--ud-radius-sm);
    padding: 14px 18px;
    color: var(--ud-primary-dark);
    font-weight: 600;
}

.course-hero__icon {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--ud-primary);
    color: #fff;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
}

.course-hero__stats {
    display: flex;
    gap: 18px;
}

.course-hero__stat {
    background: var(--ud-surface-alt);
    border-radius: var(--ud-radius-sm);
    padding: 14px 18px;
    flex: 1;
    text-align: center;
    box-shadow: var(--ud-shadow-subtle);
}

.course-hero__stat strong {
    display: block;
    font-size: 1.6rem;
    color: var(--ud-primary);
    line-height: 1.1;
}

.course-hero__stat span {
    font-size: 0.85rem;
    color: var(--ud-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.12em;
}

.course-content {
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.course-banner {
    display: flex;
    align-items: center;
    gap: 12px;
    border-radius: var(--ud-radius-sm);
    padding: 14px 18px;
    background: var(--ud-surface);
    border: 1px solid var(--ud-border);
    box-shadow: var(--ud-shadow-subtle);
    color: var(--ud-text);
}

.course-banner i {
    font-size: 1.2rem;
}

.course-banner--success {
    border-left: 4px solid var(--ud-success);
}

.course-banner--error {
    border-left: 4px solid var(--ud-danger);
}

.login-prompt {
    display: flex;
    justify-content: center;
    margin-top: 12px;
}

.login-card {
    width: min(640px, 100%);
    background: var(--ud-surface);
    border-radius: var(--ud-radius);
    border: 1px solid var(--ud-border);
    padding: 36px;
    box-shadow: var(--ud-shadow);
    text-align: center;
    display: grid;
    gap: 18px;
}

.login-card i {
    font-size: 2.4rem;
    color: var(--ud-primary);
}

.login-card h3 {
    margin: 0;
    font-size: 1.6rem;
}

.login-card p {
    margin: 0;
    color: var(--ud-text-muted);
    font-size: 1rem;
}

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

.form-section {
    background: var(--ud-surface);
    border: 1px solid var(--ud-border);
    border-radius: var(--ud-radius);
    padding: 32px;
    box-shadow: var(--ud-shadow-subtle);
}

.user-type-card {
    max-width: 680px;
    margin: 0 auto;
}

.form-section h2,
.form-section h3 {
    margin-top: 0;
    margin-bottom: 12px;
}

.form-group {
    margin-bottom: 1.4rem;
}

.form-label {
    display: block;
    font-weight: 600;
    color: var(--ud-text);
    margin-bottom: 0.6rem;
}

.form-input,
.form-textarea,
.form-select {
    width: 100%;
    padding: 0.85rem 1rem;
    border-radius: var(--ud-radius-xs);
    border: 1px solid var(--ud-border);
    background: #fff;
    font-size: 0.98rem;
    color: var(--ud-text);
    transition: border-color var(--transition), box-shadow var(--transition);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
    outline: none;
    border-color: var(--ud-primary);
    box-shadow: 0 0 0 4px rgba(86, 36, 208, 0.12);
}

.form-textarea {
    min-height: 120px;
    resize: vertical;
}

.checkbox-group {
    display: grid;
    gap: 12px;
}

.checkbox-item {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 14px 18px;
    border-radius: var(--ud-radius-sm);
    border: 1px solid var(--ud-border);
    background: var(--ud-surface-alt);
    transition: var(--transition);
}

.checkbox-item:hover {
    border-color: var(--ud-primary);
    background: rgba(86, 36, 208, 0.08);
}

.checkbox-input {
    width: 20px;
    height: 20px;
    accent-color: var(--ud-primary);
    cursor: pointer;
}

.checkbox-label {
    font-weight: 500;
    color: var(--ud-text);
    cursor: pointer;
}

.create-course-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    align-items: center;
}

.course-list.sortable-courses {
    display: grid;
    gap: 24px;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
}

.course-item {
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 18px;
    padding: 24px;
    border-radius: var(--ud-radius);
    background: var(--ud-surface);
    border: 1px solid var(--ud-border);
    box-shadow: var(--ud-shadow-subtle);
    transition: transform var(--transition), box-shadow var(--transition);
    min-height: 280px;
}

.course-item:hover {
    transform: translateY(-6px);
    box-shadow: var(--ud-shadow);
}

.course-handle {
    position: absolute;
    top: 18px;
    right: 18px;
    width: 38px;
    height: 38px;
    border-radius: 50%;
    border: 1px solid var(--ud-border);
    background: var(--ud-surface-alt);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: var(--ud-text-muted);
    cursor: grab;
    transition: var(--transition);
}

.course-handle:hover {
    color: var(--ud-primary);
    border-color: var(--ud-primary);
    background: rgba(86, 36, 208, 0.12);
}

.course-info {
    display: flex;
    gap: 18px;
    align-items: flex-start;
}

.course-info img {
    width: 96px;
    height: 96px;
    border-radius: var(--ud-radius-xs);
    object-fit: cover;
    box-shadow: var(--ud-shadow-subtle);
}

.course-info .course-info-content {
    flex: 1;
    display: grid;
    gap: 12px;
}

.course-info-content h3 {
    margin: 0;
    font-size: 1.25rem;
}

.course-info-content p {
    margin: 0;
    color: var(--ud-text-muted);
    font-size: 0.96rem;
    line-height: 1.5;
}

.course-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    color: var(--ud-text-muted);
    font-size: 0.85rem;
}

.course-meta span {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 10px;
    border-radius: var(--ud-radius-xs);
    background: var(--ud-surface-alt);
}

.status {
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-weight: 600;
    color: var(--ud-primary);
}

.course-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.course-actions .btn-secondary,
.course-actions .btn-primary,
.course-actions .ud-button {
    flex: 1 1 140px;
}

.empty-state {
    display: grid;
    place-items: center;
    gap: 12px;
    padding: 48px;
    border: 1px dashed var(--ud-border);
    border-radius: var(--ud-radius);
    background: var(--ud-surface-alt);
    color: var(--ud-text-muted);
    text-align: center;
}

.empty-state i {
    font-size: 2rem;
    color: var(--ud-primary);
}

.upload-area {
    border: 2px dashed var(--ud-border);
    border-radius: var(--ud-radius);
    padding: 32px;
    text-align: center;
    background: rgba(86, 36, 208, 0.04);
    transition: border-color var(--transition), background-color var(--transition);
}

.upload-area.drag-over,
.upload-area:hover {
    border-color: var(--ud-primary);
    background: rgba(86, 36, 208, 0.1);
}

.upload-prompt {
    display: grid;
    gap: 14px;
    justify-items: center;
    color: var(--ud-text-muted);
}

.upload-prompt i {
    font-size: 2.5rem;
    color: var(--ud-primary);
}

.upload-progress {
    display: grid;
    gap: 12px;
}

.progress-bar {
    width: 100%;
    height: 12px;
    border-radius: 999px;
    background: var(--ud-surface-alt);
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    width: 0;
    background: linear-gradient(135deg, var(--ud-primary) 0%, var(--ud-accent) 100%);
    transition: width 0.3s ease;
}

.upload-success {
    display: grid;
    gap: 6px;
    justify-items: center;
    color: var(--ud-text);
}

.upload-success i {
    font-size: 2rem;
    color: var(--ud-success);
}

.video-manager {
    display: grid;
    gap: 24px;
}

.video-section {
    background: var(--ud-surface);
    border: 1px solid var(--ud-border);
    border-radius: var(--ud-radius);
    box-shadow: var(--ud-shadow-subtle);
    padding: 24px;
    display: grid;
    gap: 18px;
}

.video-section .section-title {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin: 0;
}

.video-section .video-count {
    background: rgba(86, 36, 208, 0.12);
    color: var(--ud-primary);
    font-weight: 600;
    padding: 6px 10px;
    border-radius: var(--ud-radius-xs);
}

.video-list {
    display: grid;
    gap: 18px;
}

.video-item {
    background: var(--ud-surface-alt);
    border-radius: var(--ud-radius-sm);
    padding: 18px;
    display: grid;
    gap: 14px;
    border: 1px solid transparent;
    transition: var(--transition);
}

.video-item:hover {
    border-color: var(--ud-primary);
    box-shadow: var(--ud-shadow-subtle);
}

.video-thumbnail-container {
    display: flex;
    align-items: center;
    gap: 16px;
}

.video-thumbnail {
    width: 120px;
    height: 72px;
    border-radius: var(--ud-radius-xs);
    background: rgba(28, 29, 31, 0.1);
    color: #fff;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    overflow: hidden;
}

.video-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.video-title {
    font-weight: 600;
    font-size: 1.1rem;
    margin: 0;
}

.video-metadata {
    display: flex;
    gap: 12px;
    color: var(--ud-text-muted);
    font-size: 0.85rem;
}

.video-info {
    color: var(--ud-text-muted);
    font-size: 0.95rem;
    line-height: 1.6;
}

.video-description {
    background: rgba(28, 29, 31, 0.04);
    padding: 12px 14px;
    border-radius: var(--ud-radius-xs);
    font-size: 0.95rem;
    color: var(--ud-text);
}

.video-actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.video-comments {
    margin-top: 12px;
    border-top: 1px solid var(--ud-border);
    padding-top: 16px;
    display: grid;
    gap: 14px;
}

.video-comments__toggle {
    background: none;
    border: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--ud-primary);
    font-weight: 600;
    cursor: pointer;
}

.video-comments__body {
    display: grid;
    gap: 16px;
    background: rgba(86, 36, 208, 0.05);
    border-radius: var(--ud-radius-xs);
    padding: 16px;
}

.video-comments__list {
    display: grid;
    gap: 14px;
}

.video-comment {
    background: #fff;
    border-radius: var(--ud-radius-xs);
    border: 1px solid var(--ud-border);
    padding: 12px 14px;
    display: grid;
    gap: 6px;
}

.video-comment__meta {
    display: flex;
    gap: 12px;
    font-size: 0.85rem;
    color: var(--ud-text-muted);
}

.video-comment__author {
    font-weight: 600;
    color: var(--ud-text);
}

.video-comments__form {
    display: grid;
    gap: 12px;
}

.video-comments__form textarea {
    min-height: 90px;
    color: #000;
}

.video-comments__form-actions {
    display: flex;
    justify-content: flex-end;
}

.video-comments__feedback {
    font-size: 0.85rem;
    font-weight: 500;
}

.video-comments__feedback[data-state="error"] {
    color: var(--ud-danger);
}

.video-comments__feedback[data-state="success"] {
    color: var(--ud-success);
}

.video-comments__login {
    font-size: 0.9rem;
    color: var(--ud-text-muted);
}

.video-section--viewer {
    background: #fff;
    border-color: rgba(209, 215, 220, 0.6);
}

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

.modal {
    position: fixed;
    inset: 0;
    display: none;
    align-items: center;
    justify-content: center;
    background: rgba(28, 29, 31, 0.48);
    z-index: 999;
    padding: 24px;
}

.modal.active {
    display: flex;
}

.modal-content {
    width: min(640px, 100%);
    background: var(--ud-surface);
    border-radius: var(--ud-radius);
    box-shadow: var(--ud-shadow);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.modal-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--ud-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    margin: 0;
    font-size: 1.3rem;
}

.modal-body {
    padding: 24px;
    display: grid;
    gap: 18px;
}

.modal-close,
.close-modal {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--ud-text-muted);
    font-size: 1.25rem;
}

.form-actions {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
}

@media (max-width: 1024px) {
    .course-hero__inner {
        flex-direction: column;
        align-items: flex-start;
    }

    .course-hero__visual {
        width: 100%;
        max-width: none;
        flex-direction: row;
        justify-content: space-between;
    }

    .course-list.sortable-courses {
        grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    }
}

@media (max-width: 768px) {
    .course-main {
        padding: 40px 0 80px;
    }

    .course-content {
        gap: 24px;
    }

    .course-item {
        padding: 20px;
    }

    .course-info {
        flex-direction: column;
        align-items: flex-start;
    }

    .course-info img {
        width: 100%;
        height: 160px;
    }

    .video-section {
        padding: 20px;
    }

    .video-thumbnail-container {
        flex-direction: column;
        align-items: flex-start;
    }

    .video-thumbnail {
        width: 100%;
        height: 180px;
    }

    .modal-content {
        width: 100%;
    }
}

@media (max-width: 520px) {
    .course-hero__actions {
        flex-direction: column;
        align-items: stretch;
    }

    .login-actions {
        flex-direction: column;
    }

    .course-actions {
        flex-direction: column;
    }

    .btn-icon {
        width: 36px;
        height: 36px;
    }
}

/* Course Search Styles */
.course-search {
    margin-bottom: 2rem;
    background: var(--ud-surface);
    padding: 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--ud-border);
}

.course-search__bar {
    display: flex;
    gap: 1rem;
    align-items: center;
    margin-bottom: 1rem;
}

.course-search__input-wrapper {
    flex: 1;
    position: relative;
    display: flex;
    align-items: center;
    background: var(--ud-background);
    border: 1px solid var(--ud-border);
    border-radius: 8px;
    padding: 0.75rem 1rem;
    transition: border-color 0.2s;
}

.course-search__input-wrapper:focus-within {
    border-color: var(--ud-primary);
}

.course-search__input-wrapper i {
    color: var(--ud-text-muted);
    margin-right: 0.75rem;
}

.course-search__input-wrapper input {
    flex: 1;
    background: none;
    border: none;
    outline: none;
    font-size: 1rem;
    color: var(--ud-text-primary);
}

.course-search__input-wrapper input::placeholder {
    color: var(--ud-text-muted);
}

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

.course-search__advanced-toggle {
    background: none;
    border: none;
    color: var(--ud-primary);
    cursor: pointer;
    font-size: 0.9rem;
    text-decoration: underline;
    padding: 0.25rem;
    transition: color 0.2s;
}

.course-search__advanced-toggle:hover {
    color: var(--ud-primary-hover);
}

.course-search__advanced {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--ud-border);
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.course-search__advanced[hidden] {
    display: none !important;
}

.course-search__group {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.course-search__group-title {
    font-weight: 600;
    color: var(--ud-text-primary);
    margin-bottom: 0.25rem;
    font-size: 0.95rem;
}

.course-search__option {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    padding: 0.25rem;
    transition: background-color 0.2s;
    border-radius: 4px;
}

.course-search__option:hover {
    background-color: var(--ud-background);
}

.course-search__option input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--ud-primary);
}

.course-search__option span {
    font-size: 0.9rem;
    color: var(--ud-text-secondary);
    user-select: none;
}

.course-search__empty {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--ud-text-muted);
    font-size: 1.1rem;
}

/* Mobile responsive adjustments */
@media (max-width: 768px) {
    .course-search {
        padding: 1rem;
    }

    .course-search__bar {
        flex-direction: column;
        gap: 0.75rem;
    }

    .course-search__input-wrapper {
        width: 100%;
    }

    .course-search__advanced {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .course-search__actions {
        width: 100%;
        justify-content: space-between;
    }

    #courseSearchClear {
        width: 100%;
    }
}

/* Course Description with Show More */
.course-description {
    position: relative;
    margin: 0.75rem 0;
}

.course-description__text {
    display: -webkit-box;
    -webkit-line-clamp: 4;
    -webkit-box-orient: vertical;
    overflow: hidden;
    line-height: 1.5;
    max-height: 6em; /* 4 lines × 1.5 line-height */
    transition: max-height 0.3s ease;
    color: var(--ud-text-secondary);
}

.course-description__text.expanded {
    -webkit-line-clamp: unset;
    max-height: none;
}

.course-description__toggle {
    background: none;
    border: none;
    color: var(--ud-primary);
    cursor: pointer;
    font-size: 0.9rem;
    padding: 0.25rem 0;
    margin-top: 0.5rem;
    text-decoration: underline;
    transition: color 0.2s;
}

.course-description__toggle:hover {
    color: var(--ud-primary-hover);
}

.course-description__toggle .show-less {
    display: none;
}

.course-description__toggle[data-expanded="true"] .show-more {
    display: none;
}

.course-description__toggle[data-expanded="true"] .show-less {
    display: inline;
}

/* Ensure uniform course card layout */
.course-info {
    flex: 1;
    display: flex;
    gap: 1rem;
}

.course-info-content {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.course-info-content h3 {
    margin-bottom: 0.5rem;
}

.course-thumbnail {
    width: 120px;
    height: 90px;
    flex-shrink: 0;
}

.course-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: var(--ud-radius-sm);
}

.course-actions {
    margin-top: auto;
    padding-top: 1rem;
    border-top: 1px solid var(--ud-border);
}