.course-catalog-page {
    flex: 1;
    padding: 0;
}

.course-catalog-status,
.course-catalog-shell {
    margin: 0 auto;
    max-width: 1120px;
}

.course-catalog-status {
    color: #cbd5e1;
    padding: 24px;
    text-align: center;
}

.course-catalog-status[data-state="error"] {
    color: #fecaca;
}

.course-catalog-shell {
    box-sizing: border-box;
    background: linear-gradient(145deg, rgba(31, 41, 55, 0.96), rgba(17, 24, 39, 0.98));
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-left: 0;
    border-radius: 0;
    border-right: 0;
    box-shadow: 0 18px 48px rgba(0, 0, 0, 0.32);
    max-width: none;
    min-height: 100vh;
    padding: 12px;
    width: 100%;
}

.course-catalog-page--wide-viewer {
    padding: 0;
}

.course-catalog-shell--wide-viewer {
    border-left: 0;
    border-radius: 0;
    border-right: 0;
    max-width: none;
    min-height: 100vh;
    padding: 12px;
    width: 100%;
}

.course-catalog-shell--wide-viewer .course-catalog-back {
    margin-bottom: 12px;
}

.course-catalog-shell--wide-viewer .course-viewer {
    margin-top: 18px;
}

.course-catalog-shell--wide-viewer .course-viewer-header {
    margin-bottom: 14px;
}

.course-catalog-shell--wide-viewer .course-progress {
    margin-bottom: 14px;
    padding: 12px 14px;
}

.course-catalog-shell--wide-viewer .course-viewer-chapters {
    gap: 10px;
}

.course-catalog-shell--wide-viewer .course-viewer-chapter {
    padding: 8px;
}

.course-catalog-shell--wide-viewer .course-viewer-lesson-list {
    gap: 10px;
}

.course-catalog-shell--wide-viewer .course-viewer-lesson {
    padding: 8px;
}

.course-catalog-shell--wide-viewer .course-viewer-lesson__content {
    justify-items: stretch;
    padding-top: 10px;
    width: 100%;
}

.course-catalog-shell--wide-viewer .course-video {
    border-radius: 8px;
    margin-inline: 0;
    width: 100%;
}

.course-catalog-back {
    align-items: center;
    color: #cbd5e1;
    display: inline-flex;
    gap: 8px;
    margin-bottom: 28px;
    text-decoration: none;
}

.course-catalog-back:hover,
.course-catalog-back:focus-visible {
    color: #fff;
}

.course-catalog-eyebrow,
.course-card-category {
    color: #67e8f9;
    font-size: 0.75rem;
    font-weight: 800;
    letter-spacing: 0.12em;
    margin: 0 0 8px;
    text-transform: uppercase;
}

.course-catalog-header h1 {
    color: #f8fafc;
    font-size: clamp(2rem, 5vw, 3.2rem);
    font-weight: 800;
    margin: 0;
    text-align: center;
}

.course-catalog-header .course-catalog-back {
    margin-bottom: 16px;
}

.course-catalog-header {
    min-height: 0;
}

.course-catalog-notice {
    background: rgba(103, 232, 249, 0.1);
    border: 1px solid rgba(103, 232, 249, 0.28);
    border-radius: 8px;
    color: #cffafe;
    margin: 22px 0 0;
    padding: 12px 14px;
}

.course-catalog-notice[data-type="error"] {
    background: rgba(248, 113, 113, 0.1);
    border-color: rgba(248, 113, 113, 0.36);
    color: #fecaca;
}

.course-catalog-notice[data-type="success"] {
    background: rgba(74, 222, 128, 0.1);
    border-color: rgba(74, 222, 128, 0.32);
    color: #bbf7d0;
}

.course-save-toast {
    align-items: center;
    background: linear-gradient(145deg, rgba(31, 41, 55, 0.98), rgba(17, 24, 39, 0.99));
    border: 1px solid rgba(103, 232, 249, 0.42);
    border-radius: 12px;
    box-shadow: 0 14px 36px rgba(0, 0, 0, 0.4);
    color: #cffafe;
    display: flex;
    gap: 12px;
    max-width: min(440px, calc(100vw - 32px));
    opacity: 0;
    padding: 15px 16px;
    pointer-events: none;
    position: fixed;
    right: 24px;
    top: 24px;
    transform: translateY(-10px);
    transition: opacity 0.2s ease, transform 0.2s ease;
    z-index: 1000;
}

.course-save-toast[hidden] {
    display: none;
}

.course-save-toast.is-visible {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
}

.course-save-toast > .fa-circle-check {
    color: #67e8f9;
    font-size: 1.1rem;
}

.course-save-toast > span {
    flex: 1;
    line-height: 1.45;
}

.course-save-toast-close {
    align-items: center;
    background: transparent;
    border: 0;
    border-radius: 6px;
    color: #94a3b8;
    cursor: pointer;
    display: inline-flex;
    font-size: 1rem;
    justify-content: center;
    min-height: 30px;
    min-width: 30px;
}

.course-save-toast-close:hover,
.course-save-toast-close:focus-visible {
    background: rgba(255, 255, 255, 0.08);
    color: #f8fafc;
}

.course-save-toast-close:focus-visible {
    outline: 2px solid #67e8f9;
}

.course-admin-tools,
.course-list-section,
.course-editor,
.course-viewer {
    margin-top: 34px;
}

.course-admin-tools {
    background: rgba(15, 23, 42, 0.62);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 14px;
    min-width: 0;
    padding: clamp(18px, 3vw, 26px);
}

.course-admin,
.course-quick-tools {
    min-width: 0;
}

.course-admin-tools > details + details,
.course-admin-tools > .course-search-tools {
    border-top: 1px solid rgba(203, 213, 225, 0.14);
    margin-top: 14px;
    padding-top: 14px;
}

.course-search-tools {
    align-items: center;
    display: flex;
    gap: 14px;
    min-width: 0;
}

.course-search-tools h2 {
    color: #f8fafc;
    flex: 0 0 auto;
    font-size: 1rem;
    font-weight: 800;
    margin: 0;
}

.course-admin-tools--student {
    background: transparent;
    border: 0;
    margin-top: 16px;
    padding: 0;
}

.course-admin-tools--student + .course-list-section {
    margin-top: 16px;
}

.course-admin-tools--student > .course-search-tools {
    border-top: 0;
    margin: 0;
    padding: 0;
}

.course-quick-tools-content {
    display: grid;
    gap: 22px;
    margin-top: 14px;
}

.course-quick-assignment,
.course-quick-access {
    display: grid;
    gap: 16px;
    min-width: 0;
}

.course-quick-access {
    border-top: 1px solid rgba(203, 213, 225, 0.14);
    padding-top: 20px;
}

.course-quick-tools h3,
.course-quick-selection h4 {
    color: #f8fafc;
    font-size: 1.05rem;
    font-weight: 800;
    margin: 0 0 5px;
}

.course-subsection-header p {
    color: #cbd5e1;
    line-height: 1.5;
    margin: 0;
}

.course-quick-assignment-count {
    background: rgba(103, 232, 249, 0.12);
    border: 1px solid rgba(103, 232, 249, 0.2);
    border-radius: 999px;
    color: #a5f3fc;
    flex: 0 0 auto;
    font-size: 0.82rem;
    font-weight: 800;
    padding: 6px 10px;
}

.course-quick-selection-grid {
    display: grid;
    gap: 16px;
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.course-quick-selection {
    background: rgba(2, 6, 23, 0.25);
    border: 1px solid rgba(203, 213, 225, 0.12);
    border-radius: 10px;
    display: grid;
    gap: 10px;
    min-width: 0;
    padding: 14px;
}

.course-quick-selection-header,
.course-quick-access-actions {
    align-items: center;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: space-between;
}

.course-quick-selection-header .course-action {
    font-size: 0.76rem;
    min-height: 32px;
    padding: 6px 9px;
}

.course-quick-search input {
    background: #0b1220;
    border: 1px solid rgba(203, 213, 225, 0.22);
    border-radius: 7px;
    color: #f8fafc;
    font: inherit;
    height: 42px;
    padding: 8px 11px;
    width: 100%;
}

.course-quick-search input:focus {
    border-color: #67e8f9;
    outline: 2px solid rgba(103, 232, 249, 0.18);
}

.course-quick-options {
    display: grid;
    gap: 7px;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 230px), 1fr));
    max-height: 280px;
    min-height: 72px;
    overflow: auto;
}

.course-quick-option {
    align-items: center;
    background: rgba(15, 23, 42, 0.68);
    border: 1px solid rgba(203, 213, 225, 0.12);
    border-radius: 8px;
    color: #e2e8f0;
    cursor: pointer;
    display: flex;
    gap: 9px;
    min-width: 0;
    padding: 9px 10px;
}

.course-quick-option:has(input:checked) {
    background: rgba(8, 145, 178, 0.16);
    border-color: rgba(103, 232, 249, 0.42);
}

.course-quick-option input {
    accent-color: #22d3ee;
    flex: 0 0 auto;
    height: 17px;
    width: 17px;
}

.course-quick-option span {
    min-width: 0;
    overflow-wrap: anywhere;
}

.course-quick-option small {
    color: #94a3b8;
    display: block;
    margin-top: 2px;
}

.course-quick-option-status {
    color: #67e8f9;
    flex: 0 0 auto;
    font-size: 0.72rem;
    font-weight: 800;
    margin-left: auto;
}

.course-quick-access-options {
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 260px), 1fr));
}

.course-quick-access-actions {
    justify-content: flex-start;
}

.course-admin-toggle {
    align-items: center;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    list-style: none;
    min-height: 28px;
    user-select: none;
}

.course-admin-toggle::-webkit-details-marker {
    display: none;
}

.course-admin-toggle:focus-visible {
    border-radius: 6px;
    outline: 2px solid #67e8f9;
    outline-offset: 5px;
}

.course-admin-toggle-icon {
    border-bottom: 2px solid #67e8f9;
    border-right: 2px solid #67e8f9;
    height: 10px;
    margin: 0 5px 5px 16px;
    transform: rotate(45deg);
    transition: transform 0.18s ease;
    width: 10px;
}

.course-admin[open] .course-admin-toggle-icon,
.course-quick-tools[open] .course-admin-toggle-icon,
.course-search-tools[open] .course-admin-toggle-icon,
.course-assignment-panel[open] .course-admin-toggle-icon,
.course-general-info-panel[open] .course-admin-toggle-icon {
    margin-bottom: -5px;
    transform: rotate(225deg);
}

.course-admin[open] > .course-form {
    margin-top: 18px;
}

.course-admin h2,
.course-quick-tools h2,
.course-search-tools h2,
.course-section-title,
.course-editor h2,
.course-viewer h2 {
    color: #f8fafc;
    font-size: 1.35rem;
    font-weight: 800;
    margin: 0;
}

.course-form {
    display: grid;
    gap: 14px;
}

.course-create-form {
    align-items: start;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    margin-top: 0;
    min-width: 0;
}

.course-field {
    display: grid;
    gap: 7px;
    min-width: 0;
}

.course-field label {
    color: #cbd5e1;
    font-size: 0.85rem;
    font-weight: 700;
    line-height: 1.35;
    min-height: 2.7em;
}

.course-field input,
.course-field textarea {
    background: #0b1220;
    border: 1px solid rgba(203, 213, 225, 0.22);
    border-radius: 7px;
    color: #f8fafc;
    font: inherit;
    height: 44px;
    min-height: 44px;
    padding: 9px 11px;
    width: 100%;
}

.course-field textarea {
    height: 88px;
    min-height: 88px;
    resize: vertical;
}

.course-create-form > .course-field:first-child,
.course-editor-form > .course-field:first-child {
    grid-column: 1;
    grid-row: 1;
}

.course-create-form > .course-field:nth-child(2),
.course-editor-form > .course-field:nth-child(2) {
    grid-column: 1 / -1;
    grid-row: 2;
}

.course-create-form > .course-field:nth-child(3),
.course-editor-form > .course-field:nth-child(3) {
    grid-column: 2;
    grid-row: 1;
}

.course-create-form > .course-cover-field,
.course-editor-form > .course-cover-field {
    grid-column: 1 / -1;
    grid-row: 3;
}

.course-create-form > .course-action,
.course-editor-form > .course-action {
    grid-column: 1 / -1;
    grid-row: 4;
    justify-self: start;
    min-width: 180px;
}

.course-field input:focus,
.course-field textarea:focus {
    border-color: #67e8f9;
    outline: 2px solid rgba(103, 232, 249, 0.18);
}

.course-cover-picker {
    align-items: center;
    background: rgba(2, 6, 23, 0.35);
    border: 1px solid rgba(203, 213, 225, 0.12);
    border-radius: 9px;
    display: flex;
    gap: 14px;
    min-height: 84px;
    min-width: 0;
    padding: 10px 12px;
}

.course-cover-preview {
    background: #0b1220;
    border: 1px solid rgba(203, 213, 225, 0.22);
    border-radius: 8px;
    flex: 0 0 96px;
    height: 62px;
    object-fit: contain;
    padding: 4px;
    width: 96px;
}

.course-cover-picker input[type="file"] {
    color: #cbd5e1;
    font-size: 0.76rem;
    height: auto;
    min-width: 0;
    width: 100%;
}

.course-cover-picker input[type="file"]::file-selector-button {
    background: rgba(148, 163, 184, 0.12);
    border: 1px solid rgba(203, 213, 225, 0.24);
    border-radius: 6px;
    color: #e2e8f0;
    cursor: pointer;
    margin-right: 8px;
    padding: 7px 9px;
}

.course-action {
    align-items: center;
    border: 1px solid transparent;
    border-radius: 7px;
    cursor: pointer;
    display: inline-flex;
    font: inherit;
    font-size: 0.88rem;
    font-weight: 750;
    gap: 8px;
    justify-content: center;
    min-height: 40px;
    padding: 9px 13px;
    text-decoration: none;
    transition: background-color 0.16s ease, border-color 0.16s ease, transform 0.16s ease;
}

.course-action:hover {
    transform: translateY(-1px);
}

.course-action--primary {
    background: #2563eb;
    border-color: #3b82f6;
    color: #fff;
}

.course-action--primary:hover,
.course-action--primary:focus-visible {
    background: #1d4ed8;
    color: #fff;
}

.course-action--secondary {
    background: rgba(148, 163, 184, 0.1);
    border-color: rgba(203, 213, 225, 0.24);
    color: #e2e8f0;
}

.course-action--secondary:hover,
.course-action--secondary:focus-visible {
    background: rgba(148, 163, 184, 0.2);
    color: #fff;
}

.course-action--danger {
    background: rgba(248, 113, 113, 0.1);
    border-color: rgba(248, 113, 113, 0.3);
    color: #fecaca;
}

.course-action--danger:hover,
.course-action--danger:focus-visible {
    background: rgba(248, 113, 113, 0.2);
    color: #fff;
}

.course-section-title {
    margin-bottom: 12px;
}

.course-catalog-search {
    display: block;
    flex: 1;
    margin: 0;
    min-width: 0;
}

.course-catalog-search input {
    background: #0b1220;
    border: 1px solid rgba(203, 213, 225, 0.22);
    border-radius: 7px;
    color: #f8fafc;
    font: inherit;
    height: 42px;
    padding: 8px 11px;
    width: 100%;
}

.course-catalog-search input:focus {
    border-color: #67e8f9;
    outline: 2px solid rgba(103, 232, 249, 0.18);
}

.course-catalog-grid {
    display: grid;
    gap: 18px;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr));
}

.course-card {
    background: rgba(15, 23, 42, 0.78);
    border: 1px solid rgba(103, 232, 249, 0.25);
    border-radius: 14px;
    display: flex;
    flex-direction: column;
    min-height: 100%;
    overflow: hidden;
    transition: border-color 0.18s ease, transform 0.18s ease, box-shadow 0.18s ease;
}

.course-card:hover {
    border-color: rgba(103, 232, 249, 0.72);
    box-shadow: 0 12px 28px rgba(0, 0, 0, 0.24);
    transform: translateY(-3px);
}

.course-card-cover {
    align-items: center;
    background:
        radial-gradient(ellipse at 50% 100%, rgba(124, 58, 237, 0.34), transparent 65%),
        linear-gradient(140deg, #1e293b, #0b1120 72%);
    border-bottom: 1px solid rgba(103, 232, 249, 0.16);
    display: flex;
    height: 176px;
    justify-content: center;
    overflow: hidden;
    position: relative;
}

.course-card-cover::after {
    background: linear-gradient(180deg, transparent 55%, rgba(2, 6, 23, 0.45));
    content: "";
    inset: 0;
    pointer-events: none;
    position: absolute;
}

.course-card-cover__open {
    background: transparent;
    border: 0;
    cursor: pointer;
    height: 100%;
    padding: 0;
    width: 100%;
}

.course-card-cover__open:focus-visible {
    outline: 3px solid #67e8f9;
    outline-offset: -4px;
    position: relative;
    z-index: 1;
}

.course-card-cover__open img {
    height: 100%;
    object-fit: contain;
    padding: 12px;
    transition: transform 0.24s ease;
    width: 100%;
}

.course-card:hover .course-card-cover__open img {
    transform: scale(1.06);
}

.course-card-cover__badge {
    align-items: center;
    background: rgba(2, 6, 23, 0.72);
    border: 1px solid rgba(255, 255, 255, 0.14);
    border-radius: 999px;
    color: #e2e8f0;
    display: inline-flex;
    font-size: 0.65rem;
    font-weight: 800;
    gap: 6px;
    left: 50%;
    letter-spacing: 0.07em;
    padding: 5px 9px;
    position: absolute;
    text-transform: uppercase;
    top: 50%;
    transform: translate(-50%, -50%);
    pointer-events: none;
    z-index: 1;
}

.course-card-content {
    display: flex;
    flex: 1;
    flex-direction: column;
    padding: 22px;
}

.course-card-category {
    color: #67e8f9;
    font-size: 0.68rem;
    letter-spacing: 0.09em;
}

.course-card h3 {
    color: #f8fafc;
    font-size: 1.35rem;
    font-weight: 800;
    margin: 0 0 10px;
}

.course-card-content > p:not(.course-card-category) {
    color: #cbd5e1;
    line-height: 1.55;
    margin: 0 0 20px;
    white-space: pre-wrap;
}

.course-card-actions {
    align-items: center;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: auto;
}

.course-card-actions .course-action--danger {
    margin-left: auto;
    padding-inline: 11px;
}

.course-empty {
    color: #cbd5e1;
    grid-column: 1 / -1;
    line-height: 1.6;
    margin: 0;
    padding: 18px 0;
}

.course-editor,
.course-viewer {
    border-top: 1px solid rgba(255, 255, 255, 0.12);
    padding-top: 28px;
}

.course-editor-header,
.course-subsection-header,
.course-chapter-card-header {
    align-items: flex-start;
    display: flex;
    gap: 16px;
    justify-content: space-between;
}

.course-editor-header {
    align-items: center;
    margin-bottom: 22px;
}

.course-editor-header h2,
.course-viewer h2 {
    font-size: clamp(1.4rem, 3vw, 2rem);
}

.course-editor-form {
    align-items: start;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    margin-bottom: 24px;
    min-width: 0;
}

.course-assignment-panel,
.course-general-info-panel,
.course-chapters {
    background: rgba(15, 23, 42, 0.55);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    margin-top: 18px;
    padding: clamp(16px, 3vw, 22px);
}

.course-general-info-panel > .course-admin-toggle h3 {
    color: #f8fafc;
    font-size: 1.1rem;
    font-weight: 800;
    margin: 0;
}

.course-general-info-panel[open] > .course-editor-form {
    margin-top: 18px;
}

.course-assignment-panel > .course-admin-toggle h3,
.course-chapters h3 {
    color: #f8fafc;
    font-size: 1.1rem;
    font-weight: 800;
    margin: 0;
}

.course-assignment-form > p,
.course-subsection-header p,
.course-chapter-card-header p,
.course-viewer-header p,
.course-viewer-chapter > p:not(.course-card-category) {
    color: #cbd5e1;
    line-height: 1.5;
    margin: 0;
}

.course-assignment-form {
    margin-top: 16px;
}

.course-student-groups {
    display: grid;
    gap: 14px;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    min-width: 0;
}

.course-student-group {
    background: rgba(2, 6, 23, 0.28);
    border: 1px solid rgba(203, 213, 225, 0.12);
    border-radius: 9px;
    min-width: 0;
    padding: 12px;
}

.course-student-group h4 {
    align-items: center;
    color: #e2e8f0;
    display: flex;
    font-size: 0.92rem;
    gap: 8px;
    justify-content: space-between;
    margin: 0 0 10px;
}

.course-student-group h4 span {
    background: rgba(103, 232, 249, 0.12);
    border: 1px solid rgba(103, 232, 249, 0.2);
    border-radius: 999px;
    color: #a5f3fc;
    font-size: 0.76rem;
    min-width: 26px;
    padding: 2px 7px;
    text-align: center;
}

.course-student-list {
    display: grid;
    gap: 8px;
    grid-template-columns: minmax(0, 1fr);
    max-height: 270px;
    overflow: auto;
}

.course-student-search {
    max-width: 520px;
}

.course-student-option {
    align-items: center;
    background: rgba(2, 6, 23, 0.45);
    border: 1px solid rgba(203, 213, 225, 0.12);
    border-radius: 8px;
    color: #f8fafc;
    cursor: pointer;
    display: flex;
    gap: 10px;
    min-width: 0;
    padding: 10px;
}

.course-student-option--all-access {
    border-color: rgba(103, 232, 249, 0.24);
}

.course-student-option input {
    accent-color: #38bdf8;
    flex: 0 0 auto;
    height: 18px;
    width: 18px;
}

.course-student-option span {
    display: grid;
    min-width: 0;
}

.course-student-option strong,
.course-student-option small {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.course-student-option small {
    color: #94a3b8;
}

.course-chapter-form,
.course-lesson-form {
    align-items: end;
    grid-template-columns: minmax(180px, 1fr) minmax(180px, 1.4fr) 100px auto;
    margin-top: 18px;
}

.course-chapter-list {
    display: grid;
    gap: 14px;
    margin-top: 20px;
}

.course-chapter-card,
.course-viewer-chapter {
    background: rgba(2, 6, 23, 0.46);
    border: 1px solid rgba(203, 213, 225, 0.14);
    border-radius: 10px;
    padding: clamp(14px, 3vw, 20px);
}

.course-chapter-card > .course-chapter-card-header {
    align-items: center;
    cursor: pointer;
    list-style: none;
}

.course-chapter-card > .course-chapter-card-header::-webkit-details-marker {
    display: none;
}

.course-chapter-card > .course-chapter-card-header:focus-visible {
    border-radius: 6px;
    outline: 2px solid #67e8f9;
    outline-offset: 5px;
}

.course-chapter-card[open] > .course-chapter-card-header {
    margin-bottom: 16px;
}

.course-chapter-card[open] > .course-chapter-card-header .course-admin-toggle-icon {
    margin-bottom: -5px;
    transform: rotate(225deg);
}

.course-chapter-heading {
    align-items: center;
    display: flex;
    flex-wrap: wrap;
    gap: 9px;
}

.course-chapter-card-header h4 {
    color: #f8fafc;
    font-size: 1.05rem;
    font-weight: 800;
    margin: 0;
}

.course-lesson-count {
    background: rgba(103, 232, 249, 0.12);
    border: 1px solid rgba(103, 232, 249, 0.2);
    border-radius: 999px;
    color: #a5f3fc;
    font-size: 0.74rem;
    font-weight: 700;
    padding: 3px 9px;
}

.course-chapter-content {
    min-width: 0;
}

.course-chapter-card-header .course-action {
    flex: 0 0 auto;
}

.course-chapter-actions {
    display: flex;
    flex: 0 0 auto;
    flex-wrap: wrap;
    gap: 8px;
}

.course-lesson-list {
    color: #e2e8f0;
    display: grid;
    gap: 8px;
    list-style: none;
    margin: 18px 0 0;
    padding: 0;
}

.course-lesson-row {
    align-items: center;
    border-top: 1px solid rgba(203, 213, 225, 0.1);
    display: grid;
    gap: 12px;
    grid-template-columns: minmax(0, 1fr) auto auto auto;
    padding-top: 9px;
}

.course-lesson-row a {
    color: #fca5a5;
    text-decoration: none;
}

.course-lesson-row a:hover,
.course-lesson-row a:focus-visible {
    color: #fff;
}

.course-icon-action {
    background: transparent;
    border: 0;
    color: #fecaca;
    cursor: pointer;
    padding: 6px;
}

.course-inline-edit-form {
    align-items: end;
    grid-column: 1 / -1;
    grid-template-columns: minmax(160px, 1fr) minmax(180px, 1.3fr) 100px auto;
    padding: 12px 0 4px;
}

.course-inline-edit-form[hidden] {
    display: none;
}

.course-inline-edit-actions {
    align-items: center;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.course-lesson-form {
    border-top: 1px solid rgba(203, 213, 225, 0.1);
    padding-top: 16px;
}

.course-viewer-header {
    margin-bottom: 22px;
}

.course-viewer-header > div > p:last-child {
    margin-top: 8px;
}

.course-progress {
    background: rgba(15, 23, 42, 0.62);
    border: 1px solid rgba(103, 232, 249, 0.2);
    border-radius: 12px;
    margin: 0 0 22px;
    padding: 16px 18px;
}

.course-progress__heading {
    align-items: baseline;
    display: flex;
    flex-wrap: wrap;
    gap: 8px 16px;
    justify-content: space-between;
    margin-bottom: 11px;
}

.course-progress__heading h3 {
    color: #f8fafc;
    font-size: 1rem;
    font-weight: 800;
    margin: 0;
}

.course-progress__heading p {
    color: #cbd5e1;
    font-size: 0.88rem;
    margin: 0;
}

.course-progress__track {
    background: rgba(148, 163, 184, 0.18);
    border-radius: 999px;
    height: 11px;
    overflow: hidden;
}

.course-progress__fill {
    background: linear-gradient(90deg, #22d3ee, #4ade80);
    border-radius: inherit;
    display: block;
    height: 100%;
    transition: width 0.3s ease;
    width: 0;
}

.course-viewer-chapters {
    display: grid;
    gap: 18px;
}

.course-viewer-chapter > summary,
.course-viewer-lesson > summary {
    cursor: pointer;
    list-style: none;
}

.course-viewer-chapter > summary::-webkit-details-marker,
.course-viewer-lesson > summary::-webkit-details-marker {
    display: none;
}

.course-viewer-chapter > summary::after,
.course-viewer-lesson > summary::after {
    border-bottom: 2px solid #94a3b8;
    border-right: 2px solid #94a3b8;
    content: "";
    height: 8px;
    margin-left: auto;
    transition: transform 0.16s ease;
    width: 8px;
}

.course-viewer-chapter[open] > summary::after,
.course-viewer-lesson[open] > summary::after {
    transform: rotate(180deg);
}

.course-viewer-chapter__summary,
.course-viewer-lesson__summary {
    align-items: center;
    display: flex;
    gap: 12px;
}

.course-viewer-chapter__summary > span:first-child {
    display: grid;
    gap: 3px;
}

.course-viewer-chapter__title {
    color: #f8fafc;
    font-size: 1.3rem;
    font-weight: 800;
}

.course-viewer-chapter__content {
    padding-top: 14px;
}

.course-viewer-chapter__content > p {
    margin-bottom: 16px;
}

.course-viewer-lesson-list {
    display: grid;
    gap: 18px;
}

.course-viewer-lesson {
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid rgba(203, 213, 225, 0.12);
    border-radius: 9px;
    min-width: 0;
    padding: 12px 14px;
}

.course-viewer-lesson__title {
    color: #f8fafc;
    font-weight: 750;
}

.course-viewer-lesson__content {
    display: grid;
    gap: 14px;
    justify-items: start;
    padding-top: 14px;
}

.course-progress-badge {
    background: rgba(148, 163, 184, 0.12);
    border: 1px solid rgba(148, 163, 184, 0.22);
    border-radius: 999px;
    color: #cbd5e1;
    font-size: 0.72rem;
    font-weight: 800;
    padding: 5px 9px;
    white-space: nowrap;
}

.course-progress-badge.is-current {
    background: rgba(56, 189, 248, 0.12);
    border-color: rgba(56, 189, 248, 0.34);
    color: #bae6fd;
}

.course-progress-badge.is-complete,
.course-action--completed {
    background: rgba(74, 222, 128, 0.12);
    border-color: rgba(74, 222, 128, 0.34);
    color: #bbf7d0;
}

.course-progress-complete {
    align-items: center;
    background: rgba(74, 222, 128, 0.1);
    border: 1px solid rgba(74, 222, 128, 0.3);
    border-radius: 9px;
    color: #bbf7d0;
    display: flex;
    gap: 9px;
    margin: 0;
    padding: 13px 16px;
}

.course-video {
    aspect-ratio: 16 / 9;
    background: #020617;
    border: 1px solid rgba(203, 213, 225, 0.16);
    border-radius: 10px;
    overflow: hidden;
    width: min(100%, 820px);
}

.course-video-preview,
.course-video-player,
.course-video iframe {
    border: 0;
    height: 100%;
    width: 100%;
}

.course-video-preview {
    align-items: center;
    background: #020617;
    cursor: pointer;
    display: flex;
    justify-content: center;
    overflow: hidden;
    padding: 0;
    position: relative;
}

.course-video-preview img {
    height: 100%;
    object-fit: cover;
    transition: transform 0.2s ease, opacity 0.2s ease;
    width: 100%;
}

.course-video-preview:hover img,
.course-video-preview:focus-visible img {
    opacity: 0.78;
    transform: scale(1.03);
}

.course-video-preview:focus-visible {
    outline: 3px solid #67e8f9;
    outline-offset: -3px;
}

.course-video-preview__play {
    align-items: center;
    background: rgba(220, 38, 38, 0.94);
    border-radius: 14px;
    box-shadow: 0 4px 18px rgba(0, 0, 0, 0.4);
    color: #fff;
    display: flex;
    font-size: 1.4rem;
    height: 52px;
    justify-content: center;
    padding-left: 4px;
    position: absolute;
    transition: background-color 0.18s ease, transform 0.18s ease;
    width: 72px;
}

.course-video-preview:hover .course-video-preview__play,
.course-video-preview:focus-visible .course-video-preview__play {
    background: #b91c1c;
    transform: scale(1.08);
}

.course-video-player iframe {
    display: block;
}

.course-error {
    color: #fecaca;
}

@media (max-width: 760px) {
    .course-create-form,
    .course-editor-form,
    .course-chapter-form,
    .course-lesson-form,
    .course-inline-edit-form {
        grid-template-columns: 1fr;
    }

    .course-create-form,
    .course-editor-form {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .course-cover-picker {
        align-items: center;
    }

    .course-student-groups {
        grid-template-columns: minmax(0, 1fr);
    }

    .course-quick-selection-grid {
        grid-template-columns: minmax(0, 1fr);
    }

    .course-editor-header,
    .course-chapter-card-header {
        align-items: stretch;
        flex-direction: column;
    }

    @media (max-width: 560px) {
        .course-create-form,
        .course-editor-form {
            grid-template-columns: minmax(0, 1fr);
        }

        .course-create-form > .course-field,
        .course-create-form > .course-action,
        .course-editor-form > .course-field,
        .course-editor-form > .course-action {
            grid-column: 1;
        }

        .course-create-form > .course-action,
        .course-editor-form > .course-action {
            justify-self: stretch;
            width: 100%;
        }

        .course-create-form > .course-field,
        .course-create-form > .course-action,
        .course-editor-form > .course-field,
        .course-editor-form > .course-action {
            grid-row: auto;
        }

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

        .course-field label {
            min-height: 0;
        }
    }

    .course-viewer-chapter__summary,
    .course-viewer-lesson__summary {
        align-items: flex-start;
    }

    .course-progress-badge {
        font-size: 0.66rem;
        padding: 4px 7px;
    }

    .course-editor-header > .course-action {
        align-self: flex-start;
    }
}

@media (prefers-reduced-motion: reduce) {
    .course-card,
    .course-action,
    .course-progress__fill,
    .course-video-preview img,
    .course-video-preview__play,
    .course-admin-toggle-icon,
    .course-save-toast {
        transition: none;
    }
}