/* ─── Course Hero ─────────────────────────────── */
.course-hero {
    padding: 140px 0 0;
    background: linear-gradient(135deg, #002B5B 0%, #004C8A 60%, #0F6EB4 100%);
    color: white;
    position: relative;
    overflow: hidden;
}

.course-hero::before {
    content: '';
    position: absolute;
    top: -100px;
    right: -100px;
    width: 600px;
    height: 600px;
    background: rgba(255, 255, 255, 0.04);
    border-radius: 50%;
    pointer-events: none;
}

.hero-inner {
    display: grid;
    grid-template-columns: 1fr 380px;
    gap: 60px;
    align-items: end;
    position: relative;
    z-index: 2;
}

/* Breadcrumb */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.55);
    margin-bottom: 24px;
    letter-spacing: 0.05em;
}

.breadcrumb a {
    color: rgba(255, 255, 255, 0.55);
    text-decoration: none;
    transition: color 0.25s;
}

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

.breadcrumb-sep {
    opacity: 0.4;
    font-size: 0.75rem;
}

/* Category Badge */
.hero-category {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 16px;
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 800;
    color: white;
    letter-spacing: 0.06em;
    background: rgba(255, 255, 255, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.25);
    backdrop-filter: blur(8px);
    margin-bottom: 20px;
}

.hero-category .cat-dot {
    width: 8px;
    height: 8px;
    background: #FEEAA4;
    border-radius: 50%;
}

/* Course Title */
.course-hero h1 {
    font-family: 'Noto Serif TC', serif;
    font-size: 2.6rem;
    font-weight: 900;
    color: white;
    line-height: 1.4;
    margin-bottom: 20px;
    letter-spacing: -0.01em;
}

/* Instructor Row */
.hero-instructor-row {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 36px;
}

.hero-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.15);
    border: 2px solid rgba(255, 255, 255, 0.3);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    flex-shrink: 0;
}

.hero-instructor-name {
    font-size: 1rem;
    font-weight: 700;
    color: white;
}

.hero-instructor-dept {
    font-size: 0.82rem;
    color: rgba(255, 255, 255, 0.65);
}

/* Key Stats Strip */
.hero-stats {
    display: flex;
    gap: 0;
    background: rgba(0, 0, 0, 0.2);
    backdrop-filter: blur(10px);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    margin-top: 8px;
}

.hero-stat {
    flex: 1;
    padding: 16px 20px;
    border-right: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.hero-stat:last-child { border-right: none; }

.stat-label {
    font-size: 0.7rem;
    font-weight: 700;
    color: rgba(255, 255, 255, 0.5);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.stat-value {
    font-size: 0.95rem;
    font-weight: 700;
    color: white;
}

.stat-value.highlight { color: #FEEAA4; }

/* Hero Image Panel */
.hero-image-panel {
    align-self: stretch;
    display: flex;
    align-items: flex-end;
    justify-content: center;
}

.hero-image-box {
    width: 100%;
    height: 320px;
    border-radius: 20px 20px 0 0;
    background: linear-gradient(180deg, rgba(255,255,255,0.08) 0%, rgba(255,255,255,0.03) 100%);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-bottom: none;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 8rem;
    overflow: hidden;
    position: relative;
}

.hero-image-box img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 20px 20px 0 0;
}

.hero-image-box .img-emoji {
    position: relative;
    z-index: 2;
    filter: drop-shadow(0 8px 24px rgba(0,0,0,0.3));
}

/* ─── Layout ──────────────────────────────────── */
.detail-layout {
    display: grid;
    grid-template-columns: 1fr 360px;
    gap: 48px;
    padding: 60px 0 120px;
    align-items: start;
}

/* ─── Main Content ────────────────────────────── */
.detail-main {
    min-width: 0;
}

.content-block {
    background: white;
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 36px 40px;
    margin-bottom: 24px;
}

.block-title {
    font-family: 'Noto Serif TC', serif;
    font-size: 1.35rem;
    font-weight: 800;
    color: var(--fju-blue);
    margin-bottom: 20px;
    padding-bottom: 14px;
    border-bottom: 2px solid var(--fju-yellow);
    display: flex;
    align-items: center;
    gap: 10px;
}

.block-title .title-icon {
    font-size: 1.1rem;
}

/* Course Introduction */
.intro-text {
    font-size: 1.05rem;
    line-height: 1.9;
    color: var(--text-main);
}

.intro-text p + p {
    margin-top: 16px;
}

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

.attachment-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 14px 18px;
    border: 1px solid var(--border);
    border-radius: 10px;
    text-decoration: none;
    color: var(--text-main);
    font-size: 0.92rem;
    font-weight: 600;
    transition: var(--transition);
}

.attachment-item:hover {
    border-color: var(--fju-blue);
    background: var(--primary-soft);
    color: var(--fju-blue);
}

.attachment-icon { font-size: 1.2rem; }

/* ─── Sidebar ─────────────────────────────────── */
.detail-sidebar {
    position: sticky;
    top: 120px;
}

.info-card {
    background: white;
    border: 1px solid var(--border);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 8px 32px rgba(0, 76, 138, 0.06);
    margin-bottom: 20px;
}

.info-card-header {
    background: linear-gradient(135deg, #004C8A, #0F6EB4);
    padding: 20px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.info-card-title {
    font-size: 0.8rem;
    font-weight: 800;
    color: rgba(255, 255, 255, 0.7);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.info-hours-badge {
    background: var(--fju-yellow);
    color: #7A6200;
    padding: 4px 14px;
    border-radius: 50px;
    font-weight: 800;
    font-size: 0.82rem;
}

.info-rows {
    padding: 8px 0;
}

.info-row {
    display: grid;
    grid-template-columns: 90px 1fr;
    gap: 12px;
    padding: 14px 24px;
    border-bottom: 1px solid var(--border);
    align-items: start;
}

.info-row:last-child { border-bottom: none; }

.info-row-label {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.07em;
    padding-top: 2px;
}

.info-row-value {
    font-size: 0.92rem;
    color: var(--text-main);
    font-weight: 600;
    line-height: 1.5;
}

.info-row-value.reg-open {
    color: #2E7D32;
    font-weight: 700;
}

.info-row-value.reg-soon {
    color: #D84315;
    font-weight: 700;
}

.info-row-value.reg-closed {
    color: #888888;
    font-weight: 700;
}

/* CTA Button */
.btn-register {
    display: block;
    width: 100%;
    padding: 16px;
    background: var(--fju-blue);
    color: white;
    text-align: center;
    font-family: 'Noto Serif TC', serif;
    font-size: 1.1rem;
    font-weight: 800;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    letter-spacing: 0.05em;
}

.btn-register:hover {
    background: var(--primary-dark);
}

.btn-register.disabled {
    background-color: #F3F4F6;
    color: #888888;
    cursor: not-allowed;
    pointer-events: none;
}

.btn-register.disabled:hover {
    background-color: #F3F4F6;
}

.btn-register-wrap {
    padding: 20px 24px;
    border-top: 1px solid var(--border);
}

.btn-register {
    border-radius: 10px;
}

.reg-note {
    text-align: center;
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-top: 10px;
}

/* Share card */
.share-card {
    background: white;
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 20px 24px;
}

.share-title {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 14px;
}

.share-btns {
    display: flex;
    gap: 10px;
}

.share-btn {
    flex: 1;
    padding: 10px;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: white;
    font-size: 0.82rem;
    font-weight: 700;
    color: var(--text-muted);
    cursor: pointer;
    text-align: center;
    text-decoration: none;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.share-btn:hover {
    background: var(--primary-soft);
    border-color: var(--fju-blue);
    color: var(--fju-blue);
}

/* ─── Instructor Section ──────────────────────── */
.instructor-section {
    background: white;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    padding: 80px 0;
}

.instructor-card {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: 48px;
    align-items: start;
    max-width: 900px;
}

.instructor-portrait {
    width: 200px;
    height: 200px;
    border-radius: 20px;
    background: linear-gradient(135deg, #004C8A 0%, #0F6EB4 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 5rem;
    flex-shrink: 0;
    border: 3px solid var(--border);
    overflow: hidden;
}

.instructor-portrait img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.instructor-detail-name {
    font-family: 'Noto Serif TC', serif;
    font-size: 1.8rem;
    font-weight: 900;
    color: var(--text-main);
    margin-bottom: 6px;
}

.instructor-detail-dept {
    font-size: 0.95rem;
    color: var(--fju-blue);
    font-weight: 700;
    margin-bottom: 20px;
}

.instructor-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 20px;
}

.instructor-tag {
    padding: 4px 14px;
    border-radius: 50px;
    font-size: 0.78rem;
    font-weight: 700;
    background: var(--primary-soft);
    color: var(--fju-blue);
    border: 1px solid rgba(0, 76, 138, 0.1);
}

.instructor-bio {
    font-size: 1rem;
    color: var(--text-muted);
    line-height: 1.8;
}

/* ─── Related Courses ─────────────────────────── */
.related-section {
    padding: 80px 0 120px;
    background: var(--bg-light);
}

.related-header {
    margin-bottom: 40px;
}

.related-header h2 {
    font-family: 'Noto Serif TC', serif;
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--primary);
    margin-bottom: 8px;
}

.related-header p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

.related-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.related-card {
    background: white;
    border: 1px solid var(--border);
    border-radius: 14px;
    overflow: hidden;
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
    transition: var(--transition);
}

.related-card:hover {
    transform: translateY(-4px);
    border-color: var(--fju-blue);
    box-shadow: 0 12px 30px rgba(0, 76, 138, 0.08);
}

.related-img {
    height: 140px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3.5rem;
    background: var(--primary-soft);
}

.related-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.related-body {
    padding: 18px 20px;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.related-cat {
    display: inline-block;
    padding: 3px 12px;
    border-radius: 50px;
    font-size: 0.72rem;
    font-weight: 800;
    color: white;
    margin-bottom: 10px;
    align-self: flex-start;
}

.related-title {
    font-family: 'Noto Serif TC', serif;
    font-size: 1rem;
    font-weight: 800;
    color: var(--text-main);
    line-height: 1.5;
    flex-grow: 1;
    margin-bottom: 12px;
}

.related-meta {
    font-size: 0.8rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 6px;
}

/* Back link */
.back-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: rgba(255,255,255,0.65);
    text-decoration: none;
    font-size: 0.88rem;
    font-weight: 600;
    transition: color 0.25s;
    margin-bottom: 28px;
}

.back-link:hover { color: var(--fju-yellow); }

/* ─── Responsive ──────────────────────────────── */
@media (max-width: 1024px) {
    .hero-inner {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .hero-image-panel { display: none; }

    .detail-layout {
        grid-template-columns: 1fr;
    }

    .detail-sidebar {
        position: static;
        order: -1;
    }

    .related-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .instructor-card {
        grid-template-columns: 140px 1fr;
        gap: 28px;
    }

    .instructor-portrait {
        width: 140px;
        height: 140px;
        font-size: 3.5rem;
    }
}

@media (max-width: 640px) {
    .course-hero h1 { font-size: 1.8rem; }

    .hero-stats {
        flex-wrap: wrap;
    }

    .hero-stat {
        flex: 1 0 45%;
        border-right: none;
        border-bottom: 1px solid rgba(255,255,255,0.1);
    }

    .related-grid {
        grid-template-columns: 1fr;
    }

    .instructor-card {
        grid-template-columns: 1fr;
    }

    .content-block {
        padding: 24px 20px;
    }
}