/* ==========================================================================
   AlNajdi — Subjects grid + Chapter cards (Baims-inspired)
   ========================================================================== */

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin: 32px 0 16px;
}
.section-header h2 {
    margin: 0;
    font-family: var(--font-display);
    font-size: 22px;
    font-weight: 800;
    letter-spacing: -.01em;
    display: flex; align-items: center; gap: 8px;
}
.section-header .show-all {
    color: var(--text-mute);
    font-size: 14px;
    font-weight: 600;
    display: inline-flex; align-items: center; gap: 4px;
}
.section-header .show-all:hover { color: var(--text); }

/* Hero banner */
.hero-banner {
    background: linear-gradient(120deg, var(--brand-50), var(--bg-elev));
    border: 1px solid var(--brand-100);
    border-radius: var(--r-xl);
    padding: 28px 32px;
    margin-bottom: 40px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    flex-wrap: wrap;
}
.hero-banner-text h1 {
    margin: 0 0 6px;
    font-family: var(--font-display);
    font-size: 28px;
    font-weight: 800;
    letter-spacing: -.02em;
}
.hero-banner-text p { margin: 0; color: var(--text-soft); font-size: 15px; }
.hero-banner-art {
    width: 64px; height: 64px;
    background: var(--brand-500);
    border-radius: var(--r-lg);
    display: grid; place-items: center;
    font-size: 28px;
    color: var(--on-brand);
    flex-shrink: 0;
    box-shadow: var(--shadow);
}

/* Subjects grid */
.subjects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 20px;
}
/* Two cards per row on phones. */
@media (max-width: 640px) {
    .subjects-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 12px;
    }
    .subject-body { padding: 12px; }
    .subject-body h3 { font-size: 15px; }
    .subject-body .meta-teacher { font-size: 12px; }
    .subject-glyph { font-size: 56px; }
}

.subject-card {
    display: block;
    background: var(--bg-elev);
    border: 1px solid var(--border);
    border-radius: var(--r-lg);
    overflow: hidden;
    transition: transform .15s ease, box-shadow .15s ease, border-color .15s ease;
    color: inherit;
}
.subject-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    border-color: var(--border-strong);
}
.subject-thumb {
    aspect-ratio: 16/10;
    background: linear-gradient(135deg, var(--accent, var(--brand-500)), color-mix(in oklab, var(--accent, var(--brand-500)) 60%, black));
    background-size: cover;
    background-position: center;
    display: grid; place-items: center;
    position: relative;
}
.subject-thumb-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, transparent 50%, rgba(0,0,0,.35));
}
.subject-badge {
    position: absolute;
    top: 12px;
    inset-inline-start: 12px;
    background: rgba(255,255,255,.96);
    color: #111827;
    padding: 4px 10px;
    border-radius: var(--r-full);
    font-size: 12px;
    font-weight: 700;
    z-index: 2;
}
.subject-glyph {
    font-family: var(--font-display);
    font-size: 80px;
    font-weight: 900;
    color: rgba(255,255,255,.95);
    line-height: 1;
    letter-spacing: -.04em;
    text-shadow: 0 6px 30px rgba(0,0,0,.2);
}
.subject-body {
    padding: 14px 16px;
}
.subject-body h3 {
    margin: 0 0 4px;
    font-family: var(--font-display);
    font-size: 17px;
    font-weight: 700;
    letter-spacing: -.01em;
    color: var(--text);
}
.subject-body .meta-teacher {
    margin: 0;
    color: var(--text-mute);
    font-size: 13px;
}

/* Filter chip row */
.filter-chips {
    display: flex; gap: 10px; flex-wrap: wrap;
    margin: 16px 0 32px;
}
.filter-chip {
    padding: 10px 18px;
    background: var(--bg-elev);
    border: 1px solid var(--border);
    border-radius: var(--r-full);
    font-weight: 600;
    font-size: 14px;
    cursor: pointer;
    color: inherit;
    display: inline-flex; align-items: center; gap: 6px;
    transition: background .12s, border-color .12s;
}
.filter-chip:hover { background: var(--bg-elev-2); }
.filter-chip.active { background: var(--brand-500); color: var(--on-brand); border-color: var(--brand-500); }
/* Keep selection feedback calm; the updated chapter cards carry the motion. */
.doctor-chip {
    transition: background-color 180ms ease, border-color 180ms ease, color 180ms ease;
}
@media (prefers-reduced-motion: reduce) {
    .doctor-chip { transition: none; }
}
.sample-language-filter {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin: -12px 0 28px;
}

/* Each chapter card on the subject page stays a single column. */
.chapter-list { display: flex; flex-direction: column; gap: 12px; }
.chapter-card {
    display: grid;
    grid-template-columns: 56px 1fr auto;
    gap: 16px;
    align-items: center;
    position: relative;
    background: var(--bg-elev);
    border: 1px solid var(--border);
    border-radius: var(--r-lg);
    padding: 16px 20px;
    transition: border-color .15s ease, transform .12s;
}
.chapter-card:hover { border-color: var(--border-strong); transform: translateY(-1px); }
.chapter-card.free  { border-color: var(--brand-200); }
.chapter-card.owned { border-color: var(--brand-300); background: linear-gradient(90deg, var(--brand-50), var(--bg-elev) 40%); }

.chapter-num {
    width: 48px; height: 48px;
    border-radius: 14px;
    display: grid; place-items: center;
    background: var(--bg-elev-2);
    color: var(--text-soft);
    font-family: var(--font-display);
    font-size: 20px; font-weight: 800;
}
.chapter-card.owned .chapter-num,
.chapter-card.free .chapter-num {
    background: var(--brand-500); color: var(--on-brand);
}
/* Doctor tag pinned to the card's top-left corner. The card reserves a top
   strip when it is present, so nothing can sit underneath it. */
.chapter-card:has(> .chapter-doctor-tag) { padding-top: 40px; }
.chapter-doctor-tag {
    position: absolute;
    top: 11px;
    left: 16px;
    display: inline-flex;
    align-items: center;
    gap: 5px;
    max-width: calc(100% - 32px);
    color: var(--text-mute);
    font-size: 12px;
    font-weight: 600;
    letter-spacing: .01em;
}
.chapter-doctor-tag svg { flex-shrink: 0; opacity: .75; }
.chapter-doctor-tag .ellipsis { min-width: 0; }
.chapter-body h3 { margin: 0 0 4px; font-size: 16px; font-weight: 700; }
.chapter-body .row { gap: 6px; flex-wrap: wrap; }
.chapter-card-actions { display: flex; align-items: center; gap: 8px; }
.chapter-card-actions .btn { white-space: nowrap; }
.chapter-card-share {
    background: var(--bg-elev-2);
    border-color: var(--border);
    color: var(--text-soft);
}
.chapter-card-share:hover { border-color: var(--border-strong); color: var(--text); }

@media (max-width: 580px) {
    .chapter-card { grid-template-columns: 44px 1fr; padding: 14px; }
    .chapter-card-actions { grid-column: 1 / -1; display: grid; grid-template-columns: minmax(0, 1fr) auto; }
    .chapter-card-actions .btn { grid-column: auto; min-height: 44px; }
    .chapter-num { width: 44px; height: 44px; font-size: 18px; }
}