.course-module-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 1rem;
}

.course-inline-notice,
.course-setup {
    margin-top: 1rem;
    padding: 1rem 1.1rem;
    border-radius: 1rem;
    border: 1px solid rgba(19, 42, 74, 0.08);
    background: #f8fafc;
    color: #5f6368;
    line-height: 1.7;
}

.course-inline-notice.hidden,
.course-setup.hidden,
.course-editor-shell.hidden,
.course-file-chip.hidden,
.course-editor-notice.hidden {
    display: none;
}

.course-table-card {
    margin-top: 1.5rem;
    border: 1px solid rgba(19, 42, 74, 0.08);
    border-radius: 1.25rem;
    overflow: hidden;
    background: #ffffff;
}

.course-table-wrap {
    overflow-x: auto;
}

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

.course-table th,
.course-table td {
    padding: 1rem;
    border-bottom: 1px solid rgba(19, 42, 74, 0.08);
    text-align: left;
    vertical-align: middle;
}

.course-table th {
    font-size: 0.82rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: #6b7280;
    background: #f8fafc;
}

.course-table tr:last-child td {
    border-bottom: 0;
}

.course-title-cell strong {
    display: block;
    color: #202124;
    font-weight: 600;
}

.course-title-cell span,
.course-type-badge,
.course-file-chip {
    display: inline-flex;
    align-items: center;
    margin-top: 0.35rem;
    padding: 0.3rem 0.7rem;
    border-radius: 999px;
    background: #eef3fb;
    color: #5f6368;
    font-size: 0.8rem;
}

.course-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.55rem;
}

.course-action-button,
.course-secondary-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.45rem;
    min-height: 2.5rem;
    padding: 0 0.95rem;
    border: 1px solid rgba(19, 42, 74, 0.08);
    border-radius: 999px;
    background: #ffffff;
    color: #374151;
    text-decoration: none;
    transition: background-color 160ms ease, border-color 160ms ease;
}

.course-action-button:hover,
.course-secondary-button:hover {
    background: rgba(47, 124, 239, 0.06);
    border-color: rgba(47, 124, 239, 0.16);
}

.course-action-button--danger:hover {
    background: rgba(234, 67, 53, 0.08);
    border-color: rgba(234, 67, 53, 0.18);
    color: #b3261e;
}

.course-empty-state,
.course-builder-empty {
    padding: 2rem 1.5rem;
    text-align: center;
    color: #6b7280;
    line-height: 1.7;
}

.course-editor-shell {
    position: fixed;
    inset: 0;
    z-index: 70;
}

.course-editor-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(15, 23, 42, 0.35);
}

.course-editor-panel {
    position: absolute;
    top: 0;
    right: 0;
    width: min(860px, 100vw);
    height: 100%;
    overflow-y: auto;
    padding: 1.5rem;
    background: #ffffff;
    box-shadow: -24px 0 60px rgba(15, 23, 42, 0.14);
}

.course-editor-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 1rem;
}

.course-editor-header h3 {
    font-size: 1.7rem;
    font-weight: 600;
    letter-spacing: -0.03em;
    color: #202124;
}

.course-editor-form {
    margin-top: 1.4rem;
    display: grid;
    gap: 1.25rem;
}

.course-editor-notice {
    position: sticky;
    top: 0.75rem;
    z-index: 3;
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 1rem;
    padding: 1rem 1.1rem;
    border: 1px solid rgba(217, 48, 37, 0.18);
    border-radius: 1rem;
    background: #fef2f2;
    color: #8b1e1e;
    box-shadow: 0 16px 32px rgba(15, 23, 42, 0.12);
}

.course-editor-notice__content {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
}

.course-editor-notice__icon {
    margin-top: 0.05rem;
}

.course-editor-notice__message {
    margin: 0;
    line-height: 1.6;
}

.course-editor-notice__button {
    border: 0;
    border-radius: 999px;
    background: rgba(185, 28, 28, 0.08);
    color: #8b1e1e;
    padding: 0.65rem 1rem;
    font-weight: 600;
}

.course-editor-notice__button:hover {
    background: rgba(185, 28, 28, 0.14);
}

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

.course-editor-field {
    display: grid;
    gap: 0.45rem;
}

.course-editor-field--full {
    grid-column: 1 / -1;
}

.course-editor-label {
    font-size: 0.92rem;
    font-weight: 600;
    color: #374151;
}

.course-editor-input,
.course-editor-select,
.course-editor-textarea {
    width: 100%;
    border: 1px solid rgba(19, 42, 74, 0.14);
    border-radius: 0.95rem;
    background: #ffffff;
    color: #111827;
    padding: 0.85rem 1rem;
}

.course-editor-textarea {
    min-height: 7rem;
    resize: vertical;
}

.course-editor-input:focus,
.course-editor-select:focus,
.course-editor-textarea:focus {
    outline: none;
    border-color: rgba(47, 124, 239, 0.48);
    box-shadow: 0 0 0 4px rgba(47, 124, 239, 0.12);
}

.course-editor-input.is-invalid,
.course-editor-select.is-invalid,
.course-editor-textarea.is-invalid,
.course-file-dropzone.is-invalid,
.course-builder-shell.is-invalid,
.course-section-card.is-invalid,
.course-item-card.is-invalid {
    border-color: rgba(217, 48, 37, 0.5);
    box-shadow: 0 0 0 4px rgba(217, 48, 37, 0.12);
}

.course-builder-shell.is-invalid,
.course-section-card.is-invalid,
.course-item-card.is-invalid {
    background: #fff8f7;
}

.course-field-error {
    margin: 0.45rem 0 0;
    color: #b3261e;
    font-size: 0.83rem;
    line-height: 1.55;
}

.course-builder-shell {
    display: grid;
    gap: 1rem;
}

.course-builder-zone,
.course-section-card,
.course-item-card {
    border: 1px solid rgba(19, 42, 74, 0.08);
    border-radius: 1rem;
    background: #f8fafc;
}

.course-builder-zone {
    padding: 1rem;
}

.course-builder-head,
.course-section-head,
.course-item-head {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 0.8rem;
}

.course-builder-head h4 {
    margin: 0;
    font-size: 1rem;
    font-weight: 600;
    color: #202124;
}

.course-builder-head p {
    margin: 0.35rem 0 0;
    color: #6b7280;
    line-height: 1.6;
}

.course-builder-toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
    margin-top: 1rem;
}

.course-items-list {
    display: grid;
    gap: 0.8rem;
    margin-top: 1rem;
}

.course-section-card,
.course-item-card {
    padding: 1rem;
}

.course-item-card.is-dragging,
.course-section-card.is-dragging {
    opacity: 0.42;
}

.course-item-meta {
    display: inline-flex;
    align-items: center;
    gap: 0.55rem;
    flex-wrap: wrap;
}

.course-drag-handle {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    color: #6b7280;
    cursor: grab;
}

.course-file-dropzone {
    display: grid;
    gap: 0.8rem;
    padding: 1rem;
    border: 1px dashed rgba(47, 124, 239, 0.32);
    border-radius: 1rem;
    background: #ffffff;
}

.course-file-dropzone--cover {
    background: #f8fafc;
}

.course-file-dropzone input[type="file"] {
    display: none;
}

.course-file-dropzone p {
    margin: 0;
    color: #5f6368;
    line-height: 1.6;
}

.course-cover-preview {
    width: 100%;
    max-height: 240px;
    object-fit: cover;
    border-radius: 1rem;
    background: #e5e7eb;
}

.course-file-dropzone.is-over {
    background: #eef5ff;
    border-color: rgba(47, 124, 239, 0.56);
}

.course-editor-footer {
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
    padding-bottom: 1rem;
}

@media (max-width: 1023px) {
    .course-editor-grid {
        grid-template-columns: 1fr;
    }

    .course-editor-panel {
        padding: 1rem;
    }

    .course-module-header,
    .course-builder-head,
    .course-section-head,
    .course-item-head {
        flex-direction: column;
        align-items: stretch;
    }
}