:root {
    --ink: #1e293b;
    --muted: #64748b;
    --sea: #0f4c81;
    --sea-dark: #092e50;
    --sea-light: #e0f2fe;
    --terra: #b35a3b;
    --terra-hover: #9a4c30;
    --gold: #d97706;
    --line: #e2e8f0;
    --line-subtle: #f1f5f9;
    --bg: #f8fafc;
    --surface: #ffffff;
    --shadow: 0 10px 30px -5px rgba(15, 76, 129, 0.08), 0 4px 6px -2px rgba(15, 76, 129, 0.04);
    --shadow-hover: 0 20px 40px -10px rgba(15, 76, 129, 0.16);
    --radius-lg: 24px;
    --radius-md: 16px;
    --radius-sm: 10px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    background: var(--bg);
    color: var(--ink);
    font-family: 'Be Vietnam Pro', 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
button, input, textarea { font-family: inherit; }

/* ======================================================== */
/* 1. TOP NAVBAR & HEADER                                   */
/* ======================================================== */
.top-nav {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255, 255, 255, 0.94);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 4px 20px rgba(15, 76, 129, 0.04);
}
.nav-container {
    max-width: 1440px;
    margin: 0 auto;
    padding: 0 28px;
    min-height: 80px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}
.btn-back {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 10px 18px;
    border-radius: 999px;
    background: var(--sea-light);
    color: var(--sea);
    font-weight: 700;
    font-size: 14px;
    border: 1px solid rgba(15, 76, 129, 0.12);
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    white-space: nowrap;
}
.btn-back:hover {
    background: var(--sea);
    color: #fff;
    transform: translateX(-3px);
    box-shadow: 0 6px 16px rgba(15, 76, 129, 0.2);
}
.museum-brand {
    display: flex;
    align-items: center;
    gap: 14px;
    text-align: left;
}
.brand-logo {
    width: 46px;
    height: 46px;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--sea), #1268d5);
    color: #fff;
    display: grid;
    place-items: center;
    font-weight: 800;
    font-size: 16px;
    letter-spacing: -0.5px;
    box-shadow: 0 4px 14px rgba(15, 76, 129, 0.28);
    flex-shrink: 0;
}
.brand-text {
    display: flex;
    flex-direction: column;
}
.brand-name {
    font-weight: 800;
    font-size: 15px;
    color: var(--sea);
    letter-spacing: 0.5px;
    line-height: 1.25;
}
.brand-sub {
    font-size: 12px;
    font-weight: 600;
    color: var(--muted);
    letter-spacing: 0.2px;
}
.header-actions {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}
.font-tools {
    display: flex;
    background: #f1f5f9;
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 3px;
}
.tool-btn {
    border: 0;
    background: transparent;
    padding: 6px 12px;
    font-weight: 700;
    font-size: 13px;
    color: var(--ink);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.18s;
}
.tool-btn:hover {
    background: #fff;
    color: var(--sea);
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.06);
}
.pill-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    height: 42px;
    padding: 0 16px;
    border: 1px solid var(--line);
    border-radius: 12px;
    background: #fff;
    color: var(--ink);
    font-weight: 700;
    font-size: 13px;
    cursor: pointer;
    transition: all 0.2s;
}
.pill-btn:hover {
    border-color: var(--sea);
    color: var(--sea);
    box-shadow: 0 4px 12px rgba(15, 76, 129, 0.1);
}
.lang-pill {
    display: flex;
    background: #f1f5f9;
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 3px;
    height: 42px;
    align-items: center;
}
.lang-pill a {
    height: 34px;
    min-width: 40px;
    display: grid;
    place-items: center;
    border-radius: 9px;
    font-size: 13px;
    font-weight: 800;
    color: var(--muted);
    transition: 0.2s;
    text-decoration: none;
    padding: 0 8px;
}
.lang-pill a.active {
    background: #fff;
    color: var(--sea);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

/* ======================================================== */
/* 2. BREADCRUMBS                                           */
/* ======================================================== */
.breadcrumb-bar {
    border-bottom: 1px solid rgba(226, 232, 240, 0.6);
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(8px);
}
.breadcrumb-container {
    max-width: 1440px;
    margin: 0 auto;
    padding: 12px 28px;
}
.breadcrumbs {
    margin: 0;
    padding: 0;
    list-style: none;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
    font-size: 13px;
    font-weight: 600;
    color: var(--muted);
}
.breadcrumbs a {
    color: var(--muted);
    transition: color 0.18s;
}
.breadcrumbs a:hover {
    color: var(--sea);
}
.breadcrumbs li.active {
    color: var(--sea);
    font-weight: 700;
    max-width: 320px;
}
.breadcrumbs li i {
    font-size: 10px;
    color: #94a3b8;
}

/* ======================================================== */
/* 3. PAGE CONTENT & HERO SHOWCASE                          */
/* ======================================================== */
.page {
    max-width: 1440px;
    margin: 36px auto;
    padding: 0 28px;
    font-size: var(--reader-size, 16px);
    zoom: var(--reader-scale, 1);
}

.hero {
    display: grid;
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1.25fr);
    gap: 40px;
    align-items: start;
}

/* Left: Showcase image container */
.artifact-media {
    position: sticky;
    top: 104px;
    min-width: 0;
}
.image-showcase {
    display: flex;
    flex-direction: column;
    gap: 16px;
}
.image-stage {
    position: relative;
    height: 520px;
    padding: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    border-radius: var(--radius-lg);
    border: 1px solid var(--line);
    background: radial-gradient(circle at center, #ffffff 0%, #f1f5f9 100%);
    box-shadow: var(--shadow);
    transition: box-shadow 0.3s;
}
.image-stage:hover {
    box-shadow: var(--shadow-hover);
}
.image-stage img {
    max-width: 90%;
    max-height: 90%;
    width: auto;
    height: auto;
    object-fit: contain;
    border-radius: var(--radius-md);
    cursor: zoom-in;
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.25s;
    filter: drop-shadow(0 15px 25px rgba(15, 76, 129, 0.12));
}
.image-stage img.is-changing {
    opacity: 0;
    transform: scale(0.96);
}
.image-stage:hover img {
    transform: scale(1.03);
}
.artifact-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    opacity: 0.5;
}

/* Carousel Navigation Chevrons */
.image-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    z-index: 5;
    width: 46px;
    height: 46px;
    border-radius: 50%;
    border: 1px solid rgba(255, 255, 255, 0.9);
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(8px);
    color: var(--sea);
    display: none;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    cursor: pointer;
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.12);
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}
.image-nav.show { display: flex; }
.image-nav:hover {
    background: var(--sea);
    color: #fff;
    transform: translateY(-50%) scale(1.1);
    box-shadow: 0 8px 24px rgba(15, 76, 129, 0.3);
}
.image-nav-prev { left: 16px; }
.image-nav-next { right: 16px; }

/* Counter & Zoom badges on Image */
.image-carousel-status {
    position: absolute;
    bottom: 16px;
    right: 16px;
    z-index: 4;
    padding: 6px 14px;
    border-radius: 999px;
    background: rgba(15, 23, 42, 0.72);
    backdrop-filter: blur(6px);
    color: #fff;
    font-size: 12px;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 6px;
    pointer-events: none;
    letter-spacing: 0.5px;
}
.image-zoom-trigger {
    position: absolute;
    top: 16px;
    right: 16px;
    z-index: 4;
    width: 40px;
    height: 40px;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.8);
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(6px);
    color: var(--ink);
    display: grid;
    place-items: center;
    font-size: 15px;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    transition: all 0.2s;
}
.image-zoom-trigger:hover {
    background: var(--sea);
    color: #fff;
    transform: scale(1.08);
}

/* Gallery thumbnails strip */
.gallery-thumbnails {
    display: flex;
    gap: 12px;
    padding: 4px 2px 8px;
    overflow-x: auto;
    scrollbar-width: thin;
}
.thumb-btn {
    flex: 0 0 84px;
    width: 84px;
    height: 72px;
    padding: 5px;
    border-radius: 14px;
    border: 2px solid transparent;
    background: #fff;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.06);
    cursor: pointer;
    overflow: hidden;
    transition: all 0.2s;
}
.thumb-btn img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    border-radius: 9px;
}
.thumb-btn:hover {
    transform: translateY(-3px);
    border-color: #93c5fd;
    box-shadow: 0 6px 16px rgba(15, 76, 129, 0.15);
}
.thumb-btn.active {
    border-color: var(--sea);
    box-shadow: 0 0 0 2px rgba(15, 76, 129, 0.2), 0 6px 18px rgba(15, 76, 129, 0.25);
    transform: translateY(-2px);
}

/* Right: Artifact Info Card */
.artifact-info-card {
    background: var(--surface);
    border-radius: var(--radius-lg);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
    padding: 44px;
}
.info-badge-row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
    margin-bottom: 16px;
}
.code-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border-radius: 999px;
    background: #e0f2fe;
    color: #0369a1;
    font-size: 13px;
    font-weight: 800;
    letter-spacing: 0.5px;
}
.category-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border-radius: 999px;
    background: #f1f5f9;
    color: #475569;
    font-size: 12px;
    font-weight: 700;
}
.collection-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border-radius: 999px;
    background: #fef3c7;
    color: #92400e;
    font-size: 12px;
    font-weight: 700;
}
.artifact-title {
    font-size: 38px;
    font-weight: 800;
    line-height: 1.25;
    color: var(--sea);
    margin: 0 0 16px;
    letter-spacing: -0.5px;
}
.artifact-lead-summary {
    position: relative;
    padding: 14px 18px 14px 20px;
    margin-bottom: 28px;
    border-left: 4px solid var(--terra);
    background: #fffaf5;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}
.artifact-lead-summary p {
    margin: 0;
    font-size: 17px;
    line-height: 1.7;
    color: #475569;
}

/* Specifications Grid */
.specs-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
    margin: 28px 0;
}
.spec-card {
    display: flex;
    align-items: flex-start;
    gap: 14px;
    padding: 14px 16px;
    border-radius: var(--radius-md);
    background: #f8fafc;
    border: 1px solid var(--line);
    transition: border-color 0.2s, transform 0.2s;
}
.spec-card:hover {
    border-color: #cbd5e1;
    transform: translateY(-2px);
    background: #fff;
}
.spec-icon {
    width: 38px;
    height: 38px;
    border-radius: 10px;
    background: #fff;
    border: 1px solid var(--line);
    display: grid;
    place-items: center;
    font-size: 16px;
    flex-shrink: 0;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.04);
}
.spec-content {
    display: flex;
    flex-direction: column;
    min-width: 0;
}
.spec-label {
    font-size: 11px;
    font-weight: 700;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.spec-val {
    font-size: 14px;
    font-weight: 700;
    color: var(--ink);
    margin-top: 2px;
    line-height: 1.4;
    word-break: break-word;
}

/* Detailed Description Box */
.detail-desc-box {
    margin: 28px 0;
    padding: 22px;
    border-radius: var(--radius-md);
    background: #fffdf7;
    border: 1px solid #fef08a;
    box-shadow: 0 4px 12px rgba(217, 119, 6, 0.04);
}
.detail-desc-head {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    font-weight: 800;
    color: #b45309;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    margin-bottom: 10px;
}
.detail-desc-content p {
    margin: 0;
    font-size: 15px;
    line-height: 1.8;
    color: #334155;
}

/* CTA Buttons */
.artifact-cta-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 32px;
    padding-top: 24px;
    border-top: 1px solid var(--line);
}
.btn-action {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 13px 22px;
    border-radius: var(--radius-md);
    font-weight: 700;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    border: 0;
}
.btn-audio {
    background: linear-gradient(135deg, var(--terra), #d97706);
    color: #fff;
    box-shadow: 0 8px 20px rgba(179, 90, 59, 0.28);
}
.btn-audio:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 28px rgba(179, 90, 59, 0.38);
}
.btn-ticket {
    background: linear-gradient(135deg, var(--sea), #1268d5);
    color: #fff;
    box-shadow: 0 8px 20px rgba(15, 76, 129, 0.28);
}
.btn-ticket:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 28px rgba(15, 76, 129, 0.38);
}
.btn-more {
    background: #f1f5f9;
    color: var(--ink);
    border: 1px solid var(--line);
}
.btn-more:hover {
    background: #e2e8f0;
    transform: translateY(-2px);
}

/* ======================================================== */
/* 4. SECTIONS (Audio, Video, QR, Feedback)                 */
/* ======================================================== */
.feature-section {
    margin-top: 48px;
    padding: 36px;
    border-radius: var(--radius-lg);
    background: var(--surface);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}
.feature-title {
    font-size: 26px;
    font-weight: 800;
    color: var(--sea);
    margin: 0 0 24px;
    display: flex;
    align-items: center;
    gap: 12px;
}
.narration-box {
    padding: 24px;
    border-radius: var(--radius-md);
    background: #fffaf2;
    border: 1px solid #fed7aa;
    color: #475569;
    line-height: 1.8;
    margin-bottom: 20px;
    font-size: 16px;
}
.audio-controls {
    display: flex;
    gap: 12px;
    margin-bottom: 24px;
}
.btn-audio-ctrl {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 20px;
    border-radius: 12px;
    font-weight: 700;
    font-size: 14px;
    cursor: pointer;
    border: 0;
    transition: 0.2s;
}
.btn-audio-play {
    background: var(--sea);
    color: #fff;
    box-shadow: 0 4px 14px rgba(15, 76, 129, 0.25);
}
.btn-audio-play:hover {
    background: var(--sea-dark);
}
.btn-audio-stop {
    background: #f1f5f9;
    color: var(--ink);
    border: 1px solid var(--line);
}
.btn-audio-stop:hover {
    background: #e2e8f0;
}
.media-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
}
.media-box {
    padding: 20px;
    border-radius: var(--radius-md);
    background: #f8fafc;
    border: 1px solid var(--line);
}
.media-box b {
    display: block;
    font-size: 15px;
    color: var(--sea);
    margin-bottom: 12px;
}
.media-box audio, .media-box video {
    width: 100%;
    border-radius: 10px;
    outline: none;
}

/* QR Code Section */
.qr-layout {
    display: grid;
    grid-template-columns: 220px 1fr;
    gap: 32px;
    align-items: center;
}
.qr-card-img {
    width: 220px;
    height: 220px;
    padding: 12px;
    border-radius: var(--radius-md);
    border: 1px solid var(--line);
    background: #fff;
    box-shadow: var(--shadow);
    display: block;
}
.qr-desc {
    font-size: 16px;
    color: var(--muted);
    margin: 0 0 20px;
    line-height: 1.6;
}
.qr-action-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

/* Feedback Layout */
.review-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr);
    gap: 32px;
}
.feedback-form {
    display: flex;
    flex-direction: column;
    gap: 14px;
}
.form-input, .form-textarea {
    width: 100%;
    padding: 12px 16px;
    border-radius: 12px;
    border: 1px solid var(--line);
    background: #fff;
    font-size: 14px;
    color: var(--ink);
    transition: border-color 0.2s;
}
.form-input:focus, .form-textarea:focus {
    outline: none;
    border-color: var(--sea);
    box-shadow: 0 0 0 3px rgba(15, 76, 129, 0.12);
}
.form-textarea { min-height: 120px; resize: vertical; }
.stars-rating {
    display: flex;
    flex-direction: row-reverse;
    justify-content: flex-end;
    gap: 4px;
}
.stars-rating input { display: none; }
.stars-rating label {
    font-size: 32px;
    color: #cbd5e1;
    cursor: pointer;
    transition: color 0.15s;
}
.stars-rating input:checked ~ label,
.stars-rating label:hover,
.stars-rating label:hover ~ label {
    color: #f59e0b;
}
.btn-submit-review {
    align-self: flex-start;
    padding: 12px 24px;
    border-radius: 12px;
    background: var(--sea);
    color: #fff;
    font-weight: 700;
    font-size: 14px;
    border: 0;
    cursor: pointer;
    box-shadow: 0 4px 14px rgba(15, 76, 129, 0.2);
    transition: all 0.2s;
}
.btn-submit-review:hover {
    background: var(--sea-dark);
    transform: translateY(-2px);
}
.review-list {
    display: flex;
    flex-direction: column;
    gap: 14px;
    max-height: 480px;
    overflow-y: auto;
}
.review-item {
    padding: 16px 20px;
    border-radius: var(--radius-md);
    background: #f8fafc;
    border: 1px solid var(--line);
}
.review-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
}
.review-author {
    font-weight: 700;
    font-size: 15px;
    color: var(--ink);
}
.review-stars {
    color: #f59e0b;
    font-size: 14px;
}
.review-item p {
    margin: 0;
    font-size: 14px;
    color: #475569;
    line-height: 1.6;
}

/* ======================================================== */
/* 5. RELATED ARTIFACTS (THE REDESIGNED SHOWCASE)            */
/* ======================================================== */
.related-section {
    margin-top: 64px;
    padding-top: 48px;
    border-top: 1px solid var(--line);
}
.related-header {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-bottom: 32px;
}
.section-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    font-weight: 800;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    color: var(--terra);
    margin-bottom: 8px;
}
.section-title {
    font-size: 34px;
    font-weight: 800;
    color: var(--sea);
    margin: 0 0 8px;
    letter-spacing: -0.5px;
}
.section-subtitle {
    margin: 0;
    font-size: 16px;
    color: var(--muted);
    max-width: 720px;
}

/* Filter Tabs */
.related-tabs {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 10px;
    margin-top: 10px;
}
.related-tab-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 18px;
    border-radius: 999px;
    border: 1px solid var(--line);
    background: #fff;
    color: var(--ink);
    font-weight: 700;
    font-size: 14px;
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.04);
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}
.related-tab-btn:hover {
    border-color: var(--sea);
    color: var(--sea);
    transform: translateY(-2px);
}
.related-tab-btn.active {
    background: var(--sea);
    color: #fff;
    border-color: var(--sea);
    box-shadow: 0 6px 18px rgba(15, 76, 129, 0.25);
}
.related-tab-btn .tab-count {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 2px 8px;
    border-radius: 999px;
    font-size: 11px;
    font-weight: 800;
    background: #f1f5f9;
    color: var(--sea);
}
.related-tab-btn.active .tab-count {
    background: rgba(255, 255, 255, 0.25);
    color: #fff;
}

/* Cards Grid */
.related-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 24px;
}
.art-card {
    position: relative;
    border-radius: var(--radius-lg);
    background: var(--surface);
    border: 1px solid var(--line);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    text-decoration: none;
    color: inherit;
}
.art-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-hover);
    border-color: #cbd5e1;
}
.art-img {
    position: relative;
    width: 100%;
    height: 230px;
    padding: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: radial-gradient(circle at center, #ffffff 0%, #f1f5f9 100%);
    overflow: hidden;
    border-bottom: 1px solid var(--line-subtle);
}
.art-code-badge {
    position: absolute;
    top: 12px;
    left: 12px;
    z-index: 2;
    padding: 4px 10px;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(6px);
    border: 1px solid rgba(226, 232, 240, 0.8);
    color: var(--sea);
    font-size: 11px;
    font-weight: 800;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.04);
}
.art-img img {
    max-width: 90%;
    max-height: 90%;
    width: auto;
    height: auto;
    object-fit: contain;
    border-radius: 10px;
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}
.art-card:hover .art-img img {
    transform: scale(1.06);
}
.art-body {
    padding: 20px 22px 22px;
    display: flex;
    flex-direction: column;
    flex: 1;
    min-width: 0;
}
.art-cat-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    margin-bottom: 8px;
}
.art-cat {
    font-size: 11px;
    font-weight: 800;
    color: var(--terra);
    letter-spacing: 0.5px;
    text-transform: uppercase;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.art-period {
    font-size: 11px;
    color: var(--muted);
    display: inline-flex;
    align-items: center;
    gap: 4px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.art-title {
    font-size: 18px;
    font-weight: 800;
    color: var(--ink);
    margin: 0 0 8px;
    line-height: 1.35;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    transition: color 0.2s;
}
.art-card:hover .art-title {
    color: var(--sea);
}
.art-meta {
    font-size: 13px;
    color: var(--muted);
    margin: 0 0 16px;
    line-height: 1.55;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.art-more {
    margin-top: auto;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    font-weight: 800;
    color: var(--sea);
    padding-top: 12px;
    border-top: 1px solid var(--line-subtle);
}

/* ======================================================== */
/* 6. SHARE MENU & LIGHTBOX MODAL                           */
/* ======================================================== */
.share-menu {
    display: none;
    position: fixed;
    z-index: 90;
    right: max(28px, calc((100% - 1440px) / 2));
    top: 92px;
    width: min(380px, calc(100vw - 32px));
    padding: 22px;
    border-radius: var(--radius-md);
    background: #fff;
    border: 1px solid var(--line);
    box-shadow: 0 20px 50px rgba(15, 76, 129, 0.2);
}
.share-menu.show { display: block; animation: share-pop 0.2s cubic-bezier(0.4, 0, 0.2, 1); }
@keyframes share-pop {
    from { opacity: 0; transform: translateY(-8px) scale(0.96); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}
.share-menu h3 {
    margin: 0 0 16px;
    font-size: 17px;
    font-weight: 800;
    color: var(--sea);
}
.share-options {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
}
.share-option {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 14px;
    border-radius: 12px;
    border: 1px solid var(--line);
    background: #f8fafc;
    color: var(--ink);
    font-weight: 700;
    font-size: 13px;
    cursor: pointer;
    transition: all 0.2s;
}
.share-option:hover {
    background: var(--sea);
    color: #fff;
    border-color: var(--sea);
}
.share-status {
    display: none;
    margin-top: 12px;
    padding: 10px 14px;
    border-radius: 10px;
    font-size: 13px;
    font-weight: 700;
    background: #dcfce7;
    color: #15803d;
    text-align: center;
}
.share-status.show { display: block; }

/* Lightbox */
.lightbox {
    position: fixed;
    inset: 0;
    z-index: 100;
    display: none;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background: rgba(8, 20, 36, 0.94);
    backdrop-filter: blur(12px);
}
.lightbox.show { display: flex; }
.lightbox-stage {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}
.lightbox-stage img {
    max-width: 92vw;
    max-height: 86vh;
    transform: scale(var(--lightbox-zoom, 1));
    transform-origin: center;
    transition: transform 0.25s, opacity 0.2s;
    filter: drop-shadow(0 20px 40px rgba(0, 0, 0, 0.5));
}
.lightbox-control {
    position: absolute;
    z-index: 2;
    width: 52px;
    height: 52px;
    border-radius: 50%;
    border: 1px solid rgba(255, 255, 255, 0.25);
    background: rgba(255, 255, 255, 0.12);
    backdrop-filter: blur(8px);
    color: #fff;
    display: grid;
    place-items: center;
    font-size: 24px;
    cursor: pointer;
    transition: all 0.2s;
}
.lightbox-control:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: scale(1.08);
}
.lightbox-prev { left: 24px; top: 50%; transform: translateY(-50%); }
.lightbox-next { right: 24px; top: 50%; transform: translateY(-50%); }
.lightbox-close { right: 24px; top: 20px; font-size: 26px; }
.lightbox-counter {
    position: absolute;
    top: 24px;
    left: 24px;
    z-index: 3;
    padding: 8px 16px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(8px);
    color: #fff;
    font-weight: 700;
    font-size: 13px;
}
.lightbox-tools {
    position: absolute;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 3;
    display: flex;
    gap: 8px;
    padding: 6px 10px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(8px);
}
.lightbox-tools button {
    width: 44px;
    height: 38px;
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    background: transparent;
    color: #fff;
    font-weight: 700;
    font-size: 14px;
    cursor: pointer;
    transition: 0.2s;
}
.lightbox-tools button:hover {
    background: rgba(255, 255, 255, 0.25);
}

.footer-space { height: 80px; }

/* ======================================================== */
/* 7. RESPONSIVE BREAKPOINTS                                */
/* ======================================================== */
@media (max-width: 1200px) {
    .related-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (max-width: 1024px) {
    .hero { grid-template-columns: 1fr; gap: 32px; }
    .artifact-media { position: static; }
    .image-stage { height: 460px; }
    .specs-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .related-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 768px) {
    .nav-container { padding: 0 16px; min-height: 70px; }
    .museum-brand { display: none; }
    .page { margin-top: 20px; padding: 0 16px; }
    .artifact-info-card { padding: 28px 22px; }
    .artifact-title { font-size: 28px; }
    .image-stage { height: 360px; padding: 16px; }
    .specs-grid { grid-template-columns: 1fr; }
    .feature-section { padding: 22px; }
    .media-grid, .qr-layout, .review-layout { grid-template-columns: 1fr; }
    .qr-card-img { margin: 0 auto; }
    .related-grid { grid-template-columns: 1fr; }
}