/* ============================================================
   Course Details — premium catalog page
   ============================================================ */
.cd-page {
    --cd-primary: var(--premium-primary, #5b3df5);
    --cd-primary-d: var(--premium-primary-dark, #4a2fe0);
    --cd-primary-l: var(--premium-primary-light, #7b5ffa);
    --cd-text: var(--premium-text, #171a25);
    --cd-muted: var(--premium-muted, #606a7f);
    --cd-border: var(--premium-border, #e4e9f5);
    --cd-surface: var(--premium-surface, #fff);
    --cd-surface-2: var(--premium-surface-2, #f9faff);
    --cd-radius: var(--premium-radius, 14px);
    --cd-radius-sm: 10px;
    --cd-shadow: var(--premium-shadow, 0 12px 36px rgba(30, 41, 59, 0.08));
    --cd-shadow-sm: var(--premium-shadow-sm, 0 4px 12px rgba(30, 41, 59, 0.05));
    --cd-success: #10b981;
    --cd-warning: #f59e0b;
    --cd-danger: #ef4444;
    color: var(--cd-text);
}

/* ----- Hero ----- */
.cd-hero {
    position: relative;
    background: linear-gradient(135deg, #1e1b3a 0%, #2d1f6b 45%, #4a2fe0 100%);
    color: #fff;
    border-radius: var(--cd-radius);
    overflow: hidden;
    padding: 48px 40px;
    margin-bottom: 28px;
    box-shadow: var(--cd-shadow);
}

.cd-hero::before {
    content: "";
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 90% 10%, rgba(123, 95, 250, 0.35), transparent 40%),
        radial-gradient(circle at 10% 90%, rgba(14, 165, 233, 0.25), transparent 45%);
    pointer-events: none;
}

.cd-hero-inner { position: relative; max-width: 880px; }

.cd-breadcrumb {
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 14px;
}

.cd-breadcrumb a { color: rgba(255, 255, 255, 0.9); text-decoration: none; }
.cd-breadcrumb a:hover { text-decoration: underline; }

.cd-meta-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 14px;
}

.cd-chip {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 11px;
    background: rgba(255, 255, 255, 0.12);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 999px;
    font-size: 0.78rem;
    font-weight: 500;
    backdrop-filter: blur(4px);
}

.cd-chip.is-status { background: rgba(16, 185, 129, 0.2); border-color: rgba(16, 185, 129, 0.4); }

.cd-title {
    font-size: clamp(1.65rem, 3vw, 2.35rem);
    font-weight: 800;
    margin: 0 0 10px;
    line-height: 1.15;
    letter-spacing: -0.01em;
}

.cd-subtitle {
    font-size: 1.05rem;
    color: rgba(255, 255, 255, 0.85);
    margin: 0 0 18px;
    line-height: 1.5;
}

.cd-rating-row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 18px;
    margin-bottom: 16px;
    font-size: 0.92rem;
}

.cd-rating-row .cd-stars i { color: #fbbf24; margin-right: 1px; }
.cd-rating-row .cd-rating-num { font-weight: 700; }
.cd-rating-row .cd-rating-sub { color: rgba(255, 255, 255, 0.75); }

.cd-instructor-row {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-top: 6px;
    font-size: 0.9rem;
}

.cd-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: linear-gradient(135deg, #7b5ffa, #0ea5e9);
    color: #fff;
    font-weight: 700;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.cd-instructor-row strong { font-weight: 600; }

/* ----- Body grid ----- */
.cd-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 360px;
    gap: 28px;
    align-items: start;
}

@media (max-width: 991px) {
    .cd-grid { grid-template-columns: 1fr; }
}

.cd-card {
    background: var(--cd-surface);
    border: 1px solid var(--cd-border);
    border-radius: var(--cd-radius);
    box-shadow: var(--cd-shadow-sm);
    padding: 24px 26px;
    margin-bottom: 22px;
}

.cd-card-title {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.15rem;
    font-weight: 700;
    margin: 0 0 14px;
    color: var(--cd-text);
}

.cd-card-title i {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #eef0ff, #f5edff);
    color: var(--cd-primary);
    font-size: 0.95rem;
}

.cd-prose {
    color: var(--cd-text);
    line-height: 1.65;
    font-size: 0.95rem;
}

.cd-prose ul, .cd-prose ol { padding-left: 22px; }
.cd-prose p:last-child { margin-bottom: 0; }

/* Stats row */
.cd-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 10px;
    padding: 14px;
    margin-bottom: 18px;
    background: var(--cd-surface-2);
    border: 1px solid var(--cd-border);
    border-radius: var(--cd-radius-sm);
}

.cd-stat {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.88rem;
}

.cd-stat i {
    color: var(--cd-primary);
    width: 28px;
    height: 28px;
    border-radius: 7px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: #fff;
    border: 1px solid var(--cd-border);
}

.cd-stat strong { display: block; font-weight: 700; }
.cd-stat span { color: var(--cd-muted); font-size: 0.78rem; }

/* Curriculum */
.cd-sections { display: flex; flex-direction: column; gap: 10px; }

.cd-sec {
    border: 1px solid var(--cd-border);
    border-radius: var(--cd-radius-sm);
    overflow: hidden;
    background: var(--cd-surface);
}

.cd-sec summary {
    list-style: none;
    cursor: pointer;
    padding: 14px 18px;
    display: flex;
    align-items: center;
    gap: 12px;
    background: var(--cd-surface-2);
    transition: background-color .15s ease;
}

.cd-sec summary:hover { background: #f1f3fb; }
.cd-sec summary::-webkit-details-marker { display: none; }

.cd-sec-seq {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--cd-primary);
    color: #fff;
    font-size: 0.8rem;
    font-weight: 700;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.cd-sec-title { font-weight: 600; flex-grow: 1; }
.cd-sec-meta { color: var(--cd-muted); font-size: 0.82rem; }
.cd-sec-caret { color: var(--cd-muted); transition: transform .2s ease; }
.cd-sec[open] .cd-sec-caret { transform: rotate(180deg); }

.cd-lec-list { list-style: none; padding: 6px 0; margin: 0; }

.cd-lec {
    padding: 10px 18px;
    border-top: 1px dashed var(--cd-border);
}

.cd-lec:first-child { border-top: none; }

.cd-lec-row {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.92rem;
}

.cd-lec-icon {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: rgba(91, 61, 245, 0.1);
    color: var(--cd-primary);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 0.82rem;
}

.cd-lec.is-locked .cd-lec-icon {
    background: #f1f5f9;
    color: #94a3b8;
}

.cd-lec.is-locked .cd-lec-title { color: var(--cd-muted); }

.cd-lec-title {
    flex-grow: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.cd-lec-dur {
    color: var(--cd-muted);
    font-size: 0.82rem;
    flex-shrink: 0;
}

.cd-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 3px 10px;
    border-radius: 999px;
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.02em;
}

.cd-badge.is-preview {
    background: rgba(16, 185, 129, 0.12);
    color: #047857;
}

.cd-lec-actions {
    margin-top: 10px;
    padding-left: 40px;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.cd-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 7px 14px;
    border-radius: 8px;
    font-size: 0.85rem;
    font-weight: 600;
    border: 1px solid var(--cd-border);
    background: #fff;
    color: var(--cd-text);
    text-decoration: none;
    cursor: pointer;
    transition: all .15s ease;
}

.cd-btn:hover {
    border-color: var(--cd-primary);
    color: var(--cd-primary);
    transform: translateY(-1px);
    box-shadow: var(--cd-shadow-sm);
}

.cd-btn-primary {
    background: linear-gradient(135deg, var(--cd-primary) 0%, var(--cd-primary-l) 100%);
    color: #fff;
    border-color: transparent;
}

.cd-btn-primary:hover { color: #fff; filter: brightness(1.05); }

/* ----- Side card ----- */
.cd-side { position: sticky; top: 24px; }

.cd-price-card {
    background: var(--cd-surface);
    border: 1px solid var(--cd-border);
    border-radius: var(--cd-radius);
    overflow: hidden;
    box-shadow: var(--cd-shadow);
}

.cd-thumb {
    aspect-ratio: 16/9;
    background: #f1f3fb;
    overflow: hidden;
    position: relative;
}

.cd-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.cd-thumb-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, transparent 50%, rgba(0, 0, 0, 0.5));
    display: flex;
    align-items: flex-end;
    justify-content: center;
    padding-bottom: 14px;
}

.cd-thumb-overlay .cd-btn {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(6px);
}

.cd-price-body { padding: 20px 22px 22px; }

.cd-price {
    font-size: 1.85rem;
    font-weight: 800;
    color: var(--cd-text);
    margin-bottom: 4px;
    line-height: 1.1;
}

.cd-price-free { color: #047857; }

.cd-price-old {
    display: inline-block;
    color: var(--cd-muted);
    text-decoration: line-through;
    font-size: 0.95rem;
    margin-left: 8px;
    font-weight: 500;
}

/* ---------- Seat-tier enrollment offer ---------- */
.cd-offer {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 8px;
}

.cd-offer__was {
    color: var(--cd-muted);
    text-decoration: line-through;
    font-size: 0.95rem;
    font-weight: 500;
}

.cd-offer__badge {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    background: #ecfdf5;
    color: #047857;
    border: 1px solid #a7f3d0;
    border-radius: 999px;
    padding: 2px 10px;
    font-size: 0.78rem;
    font-weight: 700;
}

.cd-offer__note {
    font-size: 0.82rem;
    color: var(--cd-muted);
    line-height: 1.45;
    margin-bottom: 4px;
}

.cd-cta-block { margin: 16px 0 18px; }

.cd-cta-block .cd-btn {
    width: 100%;
    justify-content: center;
    padding: 12px 14px;
    font-size: 0.95rem;
}

.cd-includes {
    list-style: none;
    padding: 0;
    margin: 0;
    border-top: 1px solid var(--cd-border);
    padding-top: 16px;
}

.cd-includes li {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 7px 0;
    font-size: 0.88rem;
    color: var(--cd-text);
}

.cd-includes li i {
    color: var(--cd-primary);
    width: 18px;
    text-align: center;
}

.cd-side-meta {
    text-align: center;
    font-size: 0.82rem;
    color: var(--cd-muted);
    margin-top: 12px;
}

/* ----- Preview modal (premium) ----- */
.cd-modal-backdrop {
    position: fixed;
    inset: 0;
    z-index: 1080;
    display: none;
    align-items: center;
    justify-content: center;
    background: rgba(15, 23, 42, 0.78);
    backdrop-filter: blur(6px);
    padding: 24px;
}

.cd-modal-backdrop.is-open { display: flex; }

.cd-modal-dialog {
    position: relative;
    background: #0f172a;
    border-radius: var(--cd-radius);
    box-shadow: 0 25px 60px rgba(0, 0, 0, 0.55);
    max-width: 960px;
    width: 100%;
    padding: 16px;
    animation: cd-modal-in .25s ease;
}

@keyframes cd-modal-in {
    from { opacity: 0; transform: scale(.95); }
    to { opacity: 1; transform: scale(1); }
}

.cd-modal-close {
    position: absolute;
    top: 8px;
    right: 8px;
    background: transparent;
    border: none;
    color: #fff;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.05rem;
    transition: background-color .15s ease;
}

.cd-modal-close:hover { background: rgba(255, 255, 255, 0.12); }

.cd-modal-title {
    color: #fff;
    margin: 0 0 10px;
    padding-right: 40px;
    font-size: 1rem;
}

.cd-modal-dialog video {
    width: 100%;
    max-height: 70vh;
    background: #000;
    border-radius: var(--cd-radius-sm);
    display: block;
}