/* ============================================
   COURSE PAGES
   Shared styles for /universities/<uni>/courses/<course>
   Reuses variables from styles.css.
   ============================================ */

/* ---------- Loading + error ---------- */
.course-loading,
.course-error {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 6rem 2rem;
    text-align: center;
    color: var(--text-tertiary);
    min-height: 40vh;
}

.course-loading .material-icons-round,
.course-error .material-icons-round {
    font-size: 44px;
    opacity: 0.55;
}

.course-error .material-icons-round {
    color: var(--accent-color);
    opacity: 0.9;
}

@keyframes course-spin { to { transform: rotate(360deg); } }
.course-loading .material-icons-round { animation: course-spin 1.2s linear infinite; }

/* ---------- Breadcrumb ---------- */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: 6px;
    flex-wrap: wrap;
    padding: 20px 24px 4px;
    font-size: 1rem;
    color: var(--text-tertiary);
}

.breadcrumb a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.breadcrumb a:hover { color: var(--accent-color); }

.breadcrumb .sep {
    font-size: 14px;
    color: var(--text-tertiary);
    opacity: 0.6;
}

.breadcrumb .current { color: var(--text-primary); }

/* ---------- Course hero ---------- */
.course-hero {
    padding: 3rem 24px;
    position: relative;
}

.uni-badge {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.uni-badge .dot {
    display: none;
}

.course-code {
    font-size: clamp(2.6rem, 6vw, 3.8rem);
    font-weight: 800;
    line-height: 1.05;
    letter-spacing: .2rem;
    margin-bottom: 8px;
}

.course-title {
    font-size: clamp(1.15rem, 3vw, 1.55rem);
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 20px;
    line-height: 1.3;
}

.course-description {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 720px;
    line-height: 1.65;
    margin-bottom: 28px;
}

.stat-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 32px;
}

.stat-pill {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    background: var(--bg-surface);
    border: 1px solid var(--divider-color);
    border-radius: .3rem;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-primary);
}

.stat-pill .material-icons-round {
    font-size: 17px;
    display: none;
    color: var(--accent-color);
}

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

/* ---------- Sections ---------- */
.course-section {
    padding: 2.5rem 24px;
    border-top: 1px solid var(--divider-color);
}

.course-section-head { margin-bottom: 20px; }

.course-section-title {
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: -0.01em;
    margin-bottom: 4px;
    color: var(--text-primary);
}

.course-section-sub {
    font-size: 1.2rem;
    color: var(--text-tertiary);
    margin: 0;
}

/* ---------- Topics ---------- */
.topic-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.topic-row {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 18px 20px;
    background: var(--bg-surface);
    border: 1px solid var(--divider-color);
    border-radius: 12px;
    text-decoration: none;
    color: inherit;
    transition: border-color var(--transition-fast), background var(--transition-fast), transform var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.topic-row:hover {
    background: var(--bg-elevated);
}


.topic-num {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-tertiary);
    min-width: 28px;
    letter-spacing: 0.5px;
}

.topic-body { flex: 1; min-width: 0; }

.topic-name {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 3px;
    color: var(--text-primary);
}

.topic-meta {
    font-size: .9rem;
    color: var(--text-tertiary);
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.topic-meta .dot-sep {
    width: 3px;
    height: 3px;
    border-radius: 50%;
    background: var(--text-tertiary);
    opacity: 0.5;
}

.topic-start {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 8px 14px;
    background: rgba(0, 0, 0, 0);
    border: 1px solid var(--text-primary);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: .9rem;
    font-weight: 600;
    flex-shrink: 0;
    transition: all var(--transition-fast);
}

.topic-row:hover .topic-start {
    background: var(--accent-color);
    color: #fff;
    border-color: var(--accent-color);
}

.topic-start .material-icons-round { font-size: 16px; }

/* ---------- Sample questions ---------- */
.sample-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.sample-question {
    background: var(--bg-surface);
    border: 1px solid var(--divider-color);
    border-radius: 12px;
    overflow: hidden;
    transition: border-color var(--transition-fast);
}

.sample-question[open] { border-color: rgba(244, 67, 54, 0.35); }

.sample-question summary {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 16px 20px;
    cursor: pointer;
    list-style: none;
    font-weight: 500;
}

.sample-question summary::-webkit-details-marker { display: none; }

.sample-q-num {
    font-size: 0.72rem;
    font-weight: 700;
    padding: 3px 8px;
    background: var(--bg-elevated);
    border-radius: 6px;
    color: var(--accent-color);
    letter-spacing: 0.5px;
    flex-shrink: 0;
}

.sample-q-text {
    flex: 1;
    font-size: 0.95rem;
    color: var(--text-primary);
    line-height: 1.45;
}

.sample-q-chevron {
    font-size: 22px;
    color: var(--text-tertiary);
    flex-shrink: 0;
    transition: transform var(--transition-fast);
}

.sample-question[open] .sample-q-chevron { transform: rotate(180deg); }

.sample-q-body {
    padding: 4px 20px 20px;
    border-top: 1px solid var(--divider-color);
}

.sample-options {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin: 14px 0;
}

.sample-option {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    font-size: 0.88rem;
    color: var(--text-secondary);
    padding: 6px 10px;
    border-radius: 6px;
}

.sample-option.correct {
    color: #4caf50;
    background: rgba(76, 175, 80, 0.08);
    font-weight: 600;
}

.sample-option-letter {
    font-weight: 700;
    flex-shrink: 0;
    min-width: 22px;
}

.sample-option.correct .sample-option-letter { color: #4caf50; }

.sample-explanation {
    font-size: 0.85rem;
    color: var(--text-secondary);
    padding: 12px 14px;
    background: var(--bg-elevated);
    border-radius: 8px;
    border-left: 3px solid var(--accent-color);
    line-height: 1.6;
}

/* ---------- Materials ---------- */
.material-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
    gap: 12px;
    perspective: 1000px;
}

.material-tile {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 16px 18px;
    background: var(--bg-surface);
    border: 1px solid var(--divider-color);
    border-radius: 12px;
    text-decoration: none;
    color: inherit;
    overflow: hidden;
    position: relative;
    transform-style: preserve-3d;
    transition: border-color var(--transition-fast), transform 0.15s ease-out, box-shadow var(--transition-fast);
    will-change: transform;
}

.material-tile::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    background: radial-gradient(400px circle at var(--mx, 50%) var(--my, 50%), rgba(244, 67, 54, 0.06), transparent 40%);
    opacity: 0;
    transition: opacity 0.25s ease;
    pointer-events: none;
}

.material-tile:hover::before { opacity: 1; }
.material-tile > * { position: relative; z-index: 1; }

.material-tile-icon {
    width: 44px;
    height: 44px;
    border-radius: 10px;
    background: rgba(0, 0, 0, 0);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.material-tile-icon .material-icons-round {
    font-size: 22px;
    color: var(--text-primary);
}

.material-tile-body {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.material-tile-title {
    font-size: 1.2rem;
    font-weight: 500;
    color: var(--text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.material-tile-meta {
    font-size: 0.9rem;
    color: var(--text-tertiary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.material-tile-type {
    font-size: 0.65rem;
    font-weight: 700;
    letter-spacing: 0.8px;
    color: var(--text-tertiary);
    padding: 3px 8px;
    background: var(--bg-elevated);
    border-radius: 100px;
    flex-shrink: 0;
}

/* ---------- FAQ ---------- */
.faq-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.faq-item {
    background: var(--bg-surface);
    border: 1px solid var(--divider-color);
    border-radius: 12px;
    overflow: hidden;
    transition: border-color var(--transition-fast);
}

.faq-item[open] { border-color: rgba(244, 67, 54, 0.35); }

.faq-item summary {
    padding: 16px 22px;
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.faq-item summary::-webkit-details-marker { display: none; }

.faq-item summary::after {
    content: 'expand_more';
    font-family: 'Material Icons Round';
    font-size: 22px;
    color: var(--text-tertiary);
    transition: transform 0.2s ease;
    flex-shrink: 0;
}

.faq-item[open] summary::after { transform: rotate(180deg); }

.faq-answer {
    padding: 0 22px 20px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ---------- Related courses ---------- */
.related-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 10px;
    perspective: 1000px;
}

.related-tile {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 14px 18px;
    background: var(--bg-surface);
    border: 1px solid var(--divider-color);
    border-radius: 12px;
    text-decoration: none;
    color: inherit;
    overflow: hidden;
    position: relative;
    transform-style: preserve-3d;
    transition: border-color var(--transition-fast), transform 0.15s ease-out, box-shadow var(--transition-fast);
    will-change: transform;
}

.related-tile::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    background: radial-gradient(400px circle at var(--mx, 50%) var(--my, 50%), rgba(244, 67, 54, 0.06), transparent 40%);
    opacity: 0;
    transition: opacity 0.25s ease;
    pointer-events: none;
}

.related-tile:hover::before { opacity: 1; }
.related-tile > * { position: relative; z-index: 1; }

.related-code {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--accent-color);
    letter-spacing: 0.5px;
}

.related-title {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-primary);
    line-height: 1.4;
}

/* ---------- CTA banner ---------- */
.course-cta {
    margin: 2rem 24px;
    padding: 36px 32px;
    background: var(--bg-surface);
    border: 1px solid var(--divider-color);
    border-radius: 18px;
    text-align: center;
}

.course-cta h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.course-cta p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin: 0 0 20px;
    max-width: 520px;
    margin-left: auto;
    margin-right: auto;
}

/* ---------- Touch + reduced motion ---------- */
@media (hover: none) {
    .material-tile,
    .related-tile {
        transform: none !important;
    }
    .material-tile::before,
    .related-tile::before {
        display: none;
    }
}

@media (prefers-reduced-motion: reduce) {
    .material-tile,
    .related-tile {
        transform: none !important;
    }
    .course-loading .material-icons-round {
        animation: none;
    }
}

/* ---------- Mobile ---------- */
@media (max-width: 600px) {
    .course-hero {
        padding: 2rem 1rem 3rem;
    }
    .course-code {
        font-size: 2.4rem;
    }
    .course-title {
        font-size: 1.15rem;
    }
    .topic-row {
        padding: 14px 16px;
        gap: 12px;
    }
    .topic-start {
        padding: 6px 10px;
        font-size: 0.75rem;
    }
    .topic-start span:not(.material-icons-round) {
        display: none;
    }
    .course-section {
        padding: 2rem .4rem;
    }
    .material-grid,
    .related-grid {
        grid-template-columns: 1fr;
    }
    .course-cta {
        padding: 28px 20px;
    }
    .sample-question summary {
        padding: 14px 16px;
        gap: 10px;
    }
    .sample-q-body {
        padding: 4px 16px 16px;
    }
}
/* ============================================
   CAMPUS IMAGE BACKGROUND ON COURSE HERO
   Applies when the university provides a
   campusImage. Overlay uses the theme's
   --bg-primary-transparent so it flips with
   dark and light mode automatically.
   ============================================ */

.course-hero.has-campus-image {
    position: relative;
    border-radius: 1rem;
    overflow: hidden;
    min-height: 70svh;
    margin: 1rem 0 2rem;
    clip-path: inset(0 round 1rem);
    isolation: isolate;
}

/* Inner content needs a wrapper to sit above the background layers */
.course-hero.has-campus-image > * {
    position: relative;
    z-index: 1;
}

/* Give the description and stats a touch more contrast against the image */
.course-hero.has-campus-image .course-description {
    color: var(--text-primary);
    opacity: 0.9;
}

/* Reduce padding on mobile so the image isn't over-stretched */
@media (max-width: 600px) {
    .course-hero.has-campus-image {
        padding: 2rem 1.25rem 2.5rem;
        border-radius: 12px;
    position: relative;
    clip-path: inset(0 round 1rem);
    isolation: isolate;
}
}

/* Fallback for very old browsers without multiple backgrounds */
@supports not (background-image: linear-gradient(red, red)) {
    .course-hero.has-campus-image {
    position: relative;
    clip-path: inset(0 round 1rem);
    isolation: isolate;
}
}
.no-pad-marg{
    margin-left: 0;
    margin-right: 0;
    padding-left: 0;
    padding-right: 0;
    border-radius: 0;
    max-width: none;
}
a {
    color: var(--text-primary);
    text-decoration: underline;
}

/* ---------- Empty state for topics / materials ---------- */
.course-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 3rem 2rem;
    text-align: center;
    color: var(--text-tertiary);
}

.course-empty .material-icons-round {
    font-size: 40px;
    opacity: 0.55;
}

.course-empty p {
    margin: 0;
    font-size: 1rem;
}
/* iOS Safari parallax */
.course-hero.has-campus-image::before {
    content: '';
    position: fixed;
    inset: 0;
    height: 100vh;
    height: 100lvh;
    z-index: 0;
    pointer-events: none;
    background-image:
        linear-gradient(var(--bg-primary-trans), var(--bg-primary-trans)),
        var(--campus-image);
    background-size: cover, cover;
    background-position: center, center;
    background-repeat: no-repeat, no-repeat;
}
.course-hero.has-campus-image > * {
    position: relative;
    z-index: 1;
}

/* ios-safe fixed parallax */
.course-hero.has-campus-image {
    min-height: 70lvh;
}
.course-hero.has-campus-image::before {
    height: 100vh;
    height: 100lvh;
    will-change: transform;
}