/* Course Page - SELAB@HKNU */

.course-page .course-layout {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 40px;
    align-items: start;
}

.course-sidebar .sidebar-box {
    position: sticky;
    top: 96px;
}

.course-content { display: flex; flex-direction: column; gap: 40px; }

.semester-card {
    background: var(--color-card-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 32px;
    box-shadow: var(--shadow-sm);
    content-visibility: auto;
    contain-intrinsic-size: 360px;
}
.semester-title {
    font-size: 1.4rem;
    font-weight: 700;
    margin: 0 0 24px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--color-bg-light);
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--color-text-dark);
}

.course-page .course-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    grid-auto-rows: 1fr;
    gap: 20px;
    padding: 0;
    margin: 0;
}

.course-page .course-item {
    background: var(--color-light-bg2);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 20px;
    display: flex;
    align-items: flex-start;
    gap: 16px;
    content-visibility: auto;
    contain-intrinsic-size: 120px;
    transition: transform 0.2s, border-color 0.2s;
}
.course-page .course-item:hover {
    transform: translateY(-2px);
    border-color: var(--color-accent);
    background: white;
    box-shadow: var(--shadow-sm);
}

.course-icon {
    width: 40px;
    height: 40px;
    background: white;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-accent);
    font-size: 1.2rem;
    border: 1px solid var(--color-border);
    flex-shrink: 0;
}

.course-info { flex: 1; }
.course-page .course-info .course-title {
    font-size: 1.05rem;
    font-weight: 700;
    margin: 0 0 10px;
    line-height: 1.4;
    color: var(--color-text-main);
}
.course-meta { display: flex; flex-wrap: wrap; gap: 6px; }

.course-page .course-meta .badge {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 600;
}
.badge--code { background: #e2e8f0; color: var(--color-secondary); }
.badge--level { background: var(--color-accent-soft); color: var(--color-accent); }

/* Course sidebar: fixed-width grid for year/eval/count alignment */
.course-page .filter-item {
    display: grid;
    grid-template-columns: 1fr auto auto;
    gap: 8px;
    align-items: center;
}
.course-page .filter-item:focus-visible {
    outline: none;
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.18);
}
.filter-left {
    display: flex;
    align-items: center;
    gap: 8px;
    min-width: 0;
}
.course-page .filter-left .label {
    font-weight: 600;
    color: inherit;
    white-space: nowrap;
}
.year-chip {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 2px 8px;
    border-radius: 999px;
    background: var(--color-accent-soft);
    color: var(--color-accent);
    font-size: 0.68rem;
    font-weight: 700;
    letter-spacing: 0.03em;
    line-height: 1.2;
    flex-shrink: 0;
}
.filter-right {
    display: inline-flex;
    align-items: center;
    gap: 8px;
}
.course-page .badge-eval {
    min-width: 52px;
    text-align: center;
}
.course-page .count {
    min-width: 32px;
    text-align: center;
}

.course-page .badge-eval {
    font-size: 0.75rem;
    background: var(--color-light-bg);
    padding: 2px 6px;
    border-radius: 4px;
    color: var(--color-text-sub);
    font-weight: 600;
}
.course-page .count {
    font-size: 0.75rem;
    background: #e2e8f0;
    padding: 2px 8px;
    border-radius: 99px;
    color: var(--color-secondary);
    font-weight: 700;
}
.course-page .filter-item.active .badge-eval,
.course-page .filter-item.active .count,
.course-page .filter-item.active .year-chip {
    background: rgba(255,255,255,0.2);
    color: white;
}

@media (max-width: 992px) {
    .course-page .course-layout { grid-template-columns: 1fr; }
    .course-content { order: 1; }
    .course-sidebar { order: 2; margin-top: 40px; }
    .course-sidebar .sidebar-box { position: static; }
}

@media (prefers-reduced-motion: reduce) {
    .semester-card,
    .course-page .course-item {
        transition: none !important;
    }

    .course-page .course-item:hover {
        transform: none;
    }
}