/*
 * Professional, light EdTech look — white background, one accent colour,
 * system fonts throughout. No dark mode: the brief calls for a
 * consistent, trustworthy "university website" feel rather than a
 * theme-aware developer-tool aesthetic.
 */

.course-discovery-archive {
    --cd-ink: #1a1a2e;
    --cd-muted: #6b7280;
    --cd-paper: #ffffff;
    --cd-surface: #ffffff;
    --cd-surface-alt: #f5f5f5;
    --cd-border: #e0e0e0;
    --cd-accent: #002147;
    --cd-accent-hover: #001631;
    --cd-accent-contrast: #ffffff;
    --cd-focus: #0077b6;

    --cd-font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;

    max-width: 72rem;
    margin: 0 auto;
    padding: 2rem 1.5rem 3rem;
    background: var(--cd-paper);
    color: var(--cd-ink);
    font-family: var(--cd-font-body);
    line-height: 1.5;
}

.course-discovery-archive h1 {
    font-size: 2.25rem;
    font-weight: 700;
    letter-spacing: -0.01em;
    margin: 0 0 1.5rem;
}

.course-discovery-archive :is(a, button, summary, input):focus-visible {
    outline: 2px solid var(--cd-focus);
    outline-offset: 2px;
}

/* --- Filter toolbar --- */

.course-discovery-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem 1rem;
    align-items: flex-end;
    margin-bottom: 2rem;
    padding: 1.25rem;
    background: var(--cd-surface-alt);
    border: 1px solid var(--cd-border);
    border-radius: 8px;
}

.course-discovery-field label {
    display: block;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--cd-muted);
    margin-bottom: 0.35rem;
}

.course-discovery-field input[type="search"] {
    padding: 0.6rem 0.75rem 0.6rem 2.25rem;
    min-width: 16rem;
    font: inherit;
    color: var(--cd-ink);
    background-color: var(--cd-surface);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%236b7280' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Ccircle cx='11' cy='11' r='7'/%3E%3Cline x1='21' y1='21' x2='16.65' y2='16.65'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: 0.65rem center;
    background-size: 1rem 1rem;
    border: 1px solid var(--cd-border);
    border-radius: 6px;
}

.course-discovery-field input[type="search"]::-webkit-search-cancel-button {
    -webkit-appearance: none;
}

.course-discovery-filter {
    position: relative;
}

.course-discovery-filter summary {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    cursor: pointer;
    padding: 0.6rem 0.9rem;
    background: var(--cd-surface);
    color: var(--cd-ink);
    border: 1px solid var(--cd-border);
    border-radius: 6px;
    font-weight: 500;
    font-size: 0.95rem;
    list-style: none;
    user-select: none;
}

.course-discovery-filter summary::-webkit-details-marker {
    display: none;
}

.course-discovery-filter summary::after {
    content: "\25BE";
    color: var(--cd-muted);
    font-size: 0.7rem;
}

.course-discovery-filter[open] summary::after {
    content: "\25B4";
}

.course-discovery-filter[open] summary {
    border-color: var(--cd-accent);
}

.course-discovery-filter__badge {
    display: inline-block;
    min-width: 1.15rem;
    padding: 0 0.35rem;
    background: var(--cd-accent);
    color: var(--cd-accent-contrast);
    border-radius: 999px;
    font-size: 0.7rem;
    font-weight: 600;
    line-height: 1.15rem;
    text-align: center;
}

.course-discovery-filter__panel {
    position: absolute;
    z-index: 10;
    top: calc(100% + 0.35rem);
    left: 0;
    min-width: 15rem;
    max-height: 16rem;
    overflow-y: auto;
    padding: 0.5rem;
    background: var(--cd-surface);
    border: 1px solid var(--cd-border);
    border-radius: 6px;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
}

.course-discovery-filter__option {
    display: flex;
    align-items: center;
    gap: 0.55rem;
    padding: 0.4rem 0.5rem;
    border-radius: 4px;
    font-weight: normal;
    cursor: pointer;
}

.course-discovery-filter__option:hover {
    background: var(--cd-surface-alt);
}

.course-discovery-filter__option input[type="checkbox"] {
    accent-color: var(--cd-accent);
}

.course-discovery-filter__empty {
    padding: 0.4rem 0.5rem;
    margin: 0;
    color: var(--cd-muted);
    font-size: 0.9rem;
}

/* --- Combobox listbox (JS-enhanced Locations/Start Dates only) --- */

.course-discovery-combobox__listbox {
    list-style: none;
    margin: 0;
    padding: 0;
}

.course-discovery-combobox__option {
    padding: 0.4rem 0.5rem;
    border-radius: 4px;
    cursor: pointer;
}

.course-discovery-combobox__option::before {
    content: "\2713";
    display: inline-block;
    width: 1.1rem;
    color: transparent;
}

.course-discovery-combobox__option.is-selected::before {
    color: var(--cd-accent);
}

.course-discovery-combobox__option.is-active {
    background: var(--cd-surface-alt);
    outline: 2px solid var(--cd-focus);
    outline-offset: -2px;
}

.course-discovery-combobox__option:hover {
    background: var(--cd-surface-alt);
}

.course-discovery-filters__actions {
    display: flex;
    align-items: center;
    gap: 1.25rem;
    margin-left: auto;
}

.course-discovery-filters__actions button {
    padding: 0.65rem 1.4rem;
    background: var(--cd-accent);
    color: var(--cd-accent-contrast);
    border: none;
    border-radius: 6px;
    font: inherit;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.15s ease;
}

.course-discovery-filters__actions button:hover {
    background: var(--cd-accent-hover);
}

.course-discovery-filters__reset {
    color: var(--cd-muted);
    font-size: 0.9rem;
    text-decoration: underline;
}

.course-discovery-filters__reset:hover {
    color: var(--cd-ink);
}

/* --- Results --- */

.course-discovery-results-count {
    margin: 0 0 1rem;
    color: var(--cd-muted);
    font-size: 0.95rem;
}

.course-discovery-results {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
    list-style: none;
    margin: 0 0 2rem;
    padding: 0;
}

@media (min-width: 40rem) {
    .course-discovery-results {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 64rem) {
    .course-discovery-results {
        grid-template-columns: repeat(3, 1fr);
    }
}

.course-discovery-card {
    background: var(--cd-surface);
    border: 1px solid var(--cd-border);
    border-radius: 8px;
    padding: 1.5rem;
    transition: box-shadow 0.15s ease;
}

.course-discovery-card:hover {
    box-shadow: 0 6px 18px rgba(0, 0, 0, 0.08);
}

.course-discovery-card__title {
    font-size: 1.15rem;
    font-weight: 600;
    margin: 0 0 0.5rem;
}

.course-discovery-card__description {
    margin: 0;
    color: var(--cd-muted);
    font-size: 0.95rem;
}

.course-discovery-card__meta {
    display: flex;
    flex-direction: column;
    gap: 0.55rem;
    margin: 1rem 0 0;
    font-size: 0.9rem;
}

.course-discovery-card__meta div {
    display: flex;
    align-items: baseline;
    gap: 0.5rem;
}

.course-discovery-card__meta dt {
    flex: 0 0 auto;
    font-weight: 600;
    color: var(--cd-muted);
    text-transform: uppercase;
    font-size: 0.7rem;
    letter-spacing: 0.04em;
}

.course-discovery-card__meta dd {
    margin: 0;
    font-weight: 400;
    color: var(--cd-ink);
}

.course-discovery-empty {
    grid-column: 1 / -1;
    padding: 2rem;
    text-align: center;
    color: var(--cd-muted);
    background: var(--cd-surface-alt);
    border: 1px solid var(--cd-border);
    border-radius: 8px;
}

/* --- Pagination --- */

.course-discovery-pagination {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 0.9rem;
    color: var(--cd-muted);
}

.course-discovery-pagination button {
    padding: 0.45rem 0.9rem;
    background: var(--cd-surface);
    color: var(--cd-ink);
    border: 1px solid var(--cd-border);
    border-radius: 6px;
    font: inherit;
    cursor: pointer;
    transition: border-color 0.15s ease;
}

.course-discovery-pagination button:hover {
    border-color: var(--cd-accent);
}

/* --- Responsive --- */

@media (max-width: 40rem) {
    .course-discovery-filters {
        flex-direction: column;
        align-items: stretch;
    }

    .course-discovery-field input[type="search"] {
        min-width: 0;
        width: 100%;
    }

    .course-discovery-filters__actions {
        margin-left: 0;
        justify-content: space-between;
    }
}