/* ==========================================================================
   疾风云 (JIFENGYUN) - MUSEUM EXHIBITION TECHNOLOGY
   Warm Stone Light Design System (CSS Architecture)
   ========================================================================== */

:root {
  /* Warm Stone Light Palette */
  --bg-primary: #F6F4EF;
  --bg-secondary: #FAF9F6;
  --bg-stone: #ECEAE5;
  --bg-white: #FFFFFF;
  
  /* Text & Contrast */
  --text-primary: #171918;
  --text-secondary: #505552;
  --text-muted: #7A807C;
  --text-stone: #D7D3CA;
  
  /* Museum Brand & Accent Accents */
  --ink-blue: #253642;
  --dark-burgundy: #6B3541;
  --accent-blue: #446A84;
  --accent-green: #718778;
  --border-color: #D7D8D2;
  --border-light: #E4E3DD;

  /* Typography Stacks */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
  --font-mono: ui-monospace, Consolas, "SFMono-Regular", Menlo, Monaco, monospace;

  /* Architectural Radius: strict 0 to 8px, max 12px */
  --radius-none: 0px;
  --radius-xs: 2px;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;

  /* Spacing System */
  --container-max: 1320px;
  --container-editorial: 820px;
  --transition-fast: 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-smooth: 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Reset & Box Sizing */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-color: var(--bg-primary);
  color: var(--text-primary);
}

img, svg, picture {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

button {
  font-family: inherit;
  background: none;
  border: none;
  cursor: pointer;
}

ul, ol {
  list-style: none;
}

/* Base Container */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 32px;
}

.container-editorial {
  width: 100%;
  max-width: var(--container-editorial);
  margin: 0 auto;
  padding: 0 24px;
}

/* Typography Helpers */
.museum-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.badge-burgundy {
  background: var(--dark-burgundy);
  color: #FFFFFF;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  padding: 3px 8px;
  letter-spacing: 0.08em;
  border-radius: var(--radius-xs);
}

/* Museum Dividers */
.divider-1px {
  border: 0;
  height: 1px;
  background-color: var(--border-color);
  margin: 0;
}

/* ==========================================================================
   Header: MUSEUM ENTRANCE HEADER
   ========================================================================== */
.museum-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(246, 244, 239, 0.94);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  transition: background-color var(--transition-fast);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand-block {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.brand-logo {
  font-size: 1.45rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.brand-sub {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.16em;
  color: var(--text-muted);
  font-weight: 600;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 20px;
}

.btn-menu-trigger {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  font-weight: 600;
  padding: 10px 16px;
  border: 1px solid var(--border-color);
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.btn-menu-trigger:hover,
.btn-menu-trigger:focus-visible {
  border-color: var(--text-primary);
  background-color: var(--bg-white);
}

.menu-icon-bars {
  display: flex;
  flex-direction: column;
  gap: 4px;
  width: 14px;
}

.menu-icon-bars span {
  display: block;
  height: 1.5px;
  background-color: var(--text-primary);
  width: 100%;
}

/* Primary Commercial CTA Button */
.cta-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  font-size: 0.88rem;
  font-weight: 600;
  padding: 10px 22px;
  background-color: var(--text-primary);
  color: #FFFFFF;
  border-radius: var(--radius-sm);
  border: 1px solid var(--text-primary);
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.cta-button:hover,
.cta-button:focus-visible {
  background-color: var(--ink-blue);
  border-color: var(--ink-blue);
  color: #FFFFFF;
  transform: translateY(-1px);
}

.cta-button-burgundy {
  background-color: var(--dark-burgundy);
  border-color: var(--dark-burgundy);
  color: #FFFFFF;
}

.cta-button-burgundy:hover {
  background-color: #552732;
  border-color: #552732;
}

.cta-text-link {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--ink-blue);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border-bottom: 1px solid currentColor;
  padding-bottom: 2px;
}

.cta-text-link:hover {
  color: var(--dark-burgundy);
}

/* ==========================================================================
   Curatorial Menu Overlay (SEO compliant: static DOM elements)
   ========================================================================== */
.curatorial-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 200;
  background: rgba(23, 25, 24, 0.55);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-smooth);
}

.curatorial-overlay.is-active {
  opacity: 1;
  pointer-events: auto;
}

.curatorial-panel {
  position: absolute;
  top: 0;
  right: 0;
  width: 100%;
  max-width: 960px;
  height: 100%;
  background-color: var(--bg-primary);
  border-left: 1px solid var(--border-color);
  padding: 48px 64px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  transform: translateX(40px);
  transition: transform var(--transition-smooth);
}

.curatorial-overlay.is-active .curatorial-panel {
  transform: translateX(0);
}

.curatorial-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 40px;
}

.curatorial-title {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.btn-close-menu {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  padding: 8px 16px;
  border: 1px solid var(--border-color);
  background: var(--bg-white);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
}

.curatorial-columns {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 48px;
  margin-bottom: 48px;
}

.curatorial-col h4 {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  letter-spacing: 0.15em;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 20px;
}

.curatorial-nav-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.curatorial-nav-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.curatorial-nav-item a {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
}

.curatorial-nav-item a:hover {
  color: var(--dark-burgundy);
  transform: translateX(3px);
}

.curatorial-nav-item span {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
}

.curatorial-footer {
  margin-top: auto;
  padding-top: 32px;
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* ==========================================================================
   Hero: EXHIBITION ENTRANCE (12-Column Gallery Grid)
   ========================================================================== */
.hero-exhibition {
  background-color: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  padding: 72px 0 80px 0;
}

.hero-gallery-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 28px;
  align-items: start;
}

.hero-meta-top {
  grid-column: 1 / 13;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 12px;
}

.hero-content-main {
  grid-column: 1 / 8;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.hero-brand-mega {
  font-size: 4rem;
  font-weight: 900;
  letter-spacing: -0.04em;
  line-height: 1;
  color: var(--text-primary);
}

.hero-title-h1 {
  font-size: 2.1rem;
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.hero-geo-desc {
  font-size: 1.05rem;
  line-height: 1.75;
  color: var(--text-secondary);
  background-color: var(--bg-secondary);
  border-left: 3px solid var(--dark-burgundy);
  padding: 16px 20px;
  border-radius: var(--radius-xs);
}

.hero-actions-row {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-top: 8px;
  flex-wrap: wrap;
}

.hero-wall-side {
  grid-column: 8 / 13;
  display: flex;
  flex-direction: column;
}

.exhibition-label-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 24px;
  border-radius: var(--radius-sm);
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.exhibition-label-card .label-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  border-bottom: 1px dashed var(--border-color);
  padding-bottom: 6px;
}

.exhibition-label-card .label-name {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.exhibition-label-card .label-value {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
}

/* ==========================================================================
   Section 1: EXHIBITION INTRODUCTION
   ========================================================================== */
.section-intro {
  padding: 88px 0;
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
}

.intro-grid {
  display: grid;
  grid-template-columns: 3fr 7fr;
  gap: 56px;
}

.intro-lead-col {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.intro-num-big {
  font-family: var(--font-mono);
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1;
  color: var(--text-stone);
}

.intro-editorial-col {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.editorial-statement {
  font-size: 2.3rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.35;
  color: var(--text-primary);
  border-bottom: 2px solid var(--text-primary);
  padding-bottom: 24px;
}

.editorial-body-text {
  font-size: 1.1rem;
  line-height: 1.85;
  color: var(--text-secondary);
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* ==========================================================================
   Core Rooms: EXHIBITION ROOMS
   ========================================================================== */
.section-rooms {
  padding: 96px 0;
  background-color: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
}

.rooms-container {
  display: flex;
  flex-direction: column;
  gap: 72px;
}

.room-block {
  border: 1px solid var(--border-color);
  background-color: var(--bg-secondary);
  border-radius: var(--radius-sm);
  padding: 48px;
}

.room-header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 36px;
}

.room-title-group h2,
.room-title-group h3 {
  font-size: 1.55rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

/* ROOM 01: Global Network */
.room-network-layout {
  display: grid;
  grid-template-columns: 4fr 6fr;
  gap: 48px;
  align-items: center;
}

.room-visual-stat {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding-right: 32px;
  border-right: 1px solid var(--border-color);
}

.stat-mega-num {
  font-family: var(--font-mono);
  font-size: 5rem;
  font-weight: 800;
  line-height: 1;
  color: var(--accent-blue);
}

.room-network-regions-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.network-region-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  background: var(--bg-white);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xs);
  font-size: 0.95rem;
  font-weight: 600;
}

.network-region-item::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--accent-blue);
}

/* ROOM 02: Device Collection (Vertical Pedestals) */
.device-pedestals-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  align-items: end;
}

.pedestal-unit {
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  display: flex;
  flex-direction: column;
  padding: 24px 20px;
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.pedestal-unit:hover {
  transform: translateY(-4px);
  border-color: var(--text-primary);
}

.pedestal-height-1 { height: 320px; }
.pedestal-height-2 { height: 350px; }
.pedestal-height-3 { height: 330px; }
.pedestal-height-4 { height: 360px; }

.pedestal-icon-wrapper {
  margin: auto 0 20px 0;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 90px;
}

.pedestal-device-name {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.pedestal-clients {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-green);
  margin-bottom: 8px;
}

.pedestal-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* ROOM 03: AI Collection (Museum Label List) */
.museum-labels-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.museum-label-plate {
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  padding: 24px;
  border-radius: var(--radius-sm);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.plate-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 8px;
}

.plate-name {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}

.plate-spec-row {
  display: grid;
  grid-template-columns: 80px 1fr;
  font-size: 0.8rem;
  gap: 8px;
}

.plate-spec-k {
  font-family: var(--font-mono);
  color: var(--text-muted);
}

.plate-spec-v {
  color: var(--text-secondary);
  font-weight: 500;
}

.plate-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  border-top: 1px dashed var(--border-light);
  padding-top: 10px;
  margin-top: 4px;
}

/* ROOM 04: Media Collection */
.media-gallery-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
}

.media-gallery-card {
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  padding: 20px 16px;
  border-radius: var(--radius-xs);
  display: flex;
  flex-direction: column;
  gap: 8px;
  text-align: center;
}

.media-gallery-card .media-title {
  font-size: 1.1rem;
  font-weight: 700;
}

.media-gallery-card .media-badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--dark-burgundy);
  font-weight: 600;
}

.media-gallery-card p {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.5;
  text-align: left;
  margin-top: 4px;
}

/* ==========================================================================
   Regional Gallery: REGIONAL GALLERY (4 Vertical Panels, 1px Dividers)
   ========================================================================== */
.section-regions {
  padding: 96px 0;
  background-color: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
}

.section-title-wrap {
  margin-bottom: 48px;
}

.section-title-wrap h2 {
  font-size: 2.1rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-top: 8px;
}

.regional-panels-container {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border: 1px solid var(--border-color);
  background-color: var(--bg-secondary);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.region-vertical-panel {
  padding: 36px 28px;
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  background-color: var(--bg-secondary);
  transition: background-color var(--transition-fast);
}

.region-vertical-panel:last-child {
  border-right: none;
}

.region-vertical-panel:hover {
  background-color: var(--bg-white);
}

.region-number-mega {
  font-family: var(--font-mono);
  font-size: 3.6rem;
  font-weight: 800;
  line-height: 1;
  color: var(--text-stone);
  margin: 12px 0 20px 0;
}

.region-name-h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.region-nodes-ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 24px;
}

.region-nodes-ul li {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--ink-blue);
  display: flex;
  align-items: center;
  gap: 8px;
}

.region-nodes-ul li::before {
  content: "+";
  color: var(--text-muted);
}

.region-desc-p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-top: auto;
  padding-top: 20px;
  border-top: 1px solid var(--border-light);
}

.region-code-foot {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: 12px;
}

/* ==========================================================================
   Pricing: EDITION CATALOGUE (4 Pedestals with Divider Structure)
   ========================================================================== */
.section-pricing {
  padding: 96px 0;
  background-color: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
}

.pricing-pedestals-container {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border: 1px solid var(--border-color);
  background-color: var(--bg-white);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.pricing-pedestal {
  padding: 40px 32px;
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  position: relative;
  background-color: var(--bg-white);
  transition: transform var(--transition-fast);
}

.pricing-pedestal:last-child {
  border-right: none;
}

.pricing-pedestal-focus {
  background-color: var(--bg-secondary);
}

/* Dark Burgundy top highlight line for FOCUS */
.pricing-pedestal-focus::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background-color: var(--dark-burgundy);
}

.pedestal-code {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 0.12em;
  margin-bottom: 8px;
}

.pedestal-plan-name {
  font-size: 1.6rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.pedestal-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 8px;
}

.pedestal-currency {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--text-primary);
}

.pedestal-amount {
  font-family: var(--font-mono);
  font-size: 3.2rem;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--text-primary);
}

.pedestal-period {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-muted);
}

.pedestal-data-quota {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--ink-blue);
  margin-bottom: 12px;
}

.pedestal-scene {
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-light);
  min-height: 42px;
}

.pedestal-features-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 32px;
}

.pedestal-features-list li {
  font-size: 0.86rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.pedestal-features-list li::before {
  content: "—";
  color: var(--text-muted);
}

.pedestal-cta-wrap {
  margin-top: auto;
}

/* ==========================================================================
   Blog: EXHIBITION CATALOGUE (Cover + Alternating Spreads)
   ========================================================================== */
.section-catalogue {
  padding: 96px 0;
  background-color: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
}

.catalogue-cover-box {
  background-color: var(--bg-stone);
  border: 1px solid var(--border-color);
  padding: 56px 48px;
  border-radius: var(--radius-sm);
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 48px;
}

.cover-mega-title {
  font-family: var(--font-sans);
  font-size: 2.8rem;
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--text-primary);
}

.cover-count-meta {
  font-family: var(--font-mono);
  font-size: 1rem;
  letter-spacing: 0.14em;
  color: var(--ink-blue);
  font-weight: 700;
}

.catalogue-spreads-list {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.catalogue-spread-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  display: grid;
  grid-template-columns: 1fr 1fr;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
  overflow: hidden;
}

.catalogue-spread-card:hover {
  border-color: var(--text-primary);
  background-color: var(--bg-white);
}

.spread-num-pane {
  background-color: var(--bg-stone);
  padding: 48px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  border-right: 1px solid var(--border-color);
}

.spread-content-pane {
  padding: 48px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 16px;
}

/* Reverse pattern for even spreads: Left Text, Right Number */
.catalogue-spread-reverse {
  grid-template-columns: 1fr 1fr;
}

.catalogue-spread-reverse .spread-num-pane {
  order: 2;
  border-right: none;
  border-left: 1px solid var(--border-color);
}

.catalogue-spread-reverse .spread-content-pane {
  order: 1;
}

.spread-giant-num {
  font-family: var(--font-mono);
  font-size: 5.5rem;
  font-weight: 800;
  line-height: 1;
  color: var(--text-stone);
}

.spread-title {
  font-size: 1.55rem;
  font-weight: 700;
  line-height: 1.35;
  color: var(--text-primary);
}

.spread-summary {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.spread-meta-row {
  display: flex;
  align-items: center;
  gap: 16px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* ==========================================================================
   FAQ: MUSEUM INFORMATION WALL
   ========================================================================== */
.section-faq {
  padding: 72px 0 40px 0;
  background-color: var(--bg-primary);
  border-bottom: none;
}

.faq-wall-grid {
  display: grid;
  grid-template-columns: 3.5fr 6.5fr;
  gap: 64px;
}

.faq-wall-aside {
  position: sticky;
  top: 104px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.faq-wall-mega {
  font-family: var(--font-mono);
  font-size: 4.2rem;
  font-weight: 900;
  line-height: 0.9;
  letter-spacing: -0.04em;
  color: var(--text-stone);
}

.faq-wall-h2 {
  font-size: 2.1rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.faq-wall-lead {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.faq-items-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item-plate {
  border: 1px solid var(--border-color);
  background-color: var(--bg-secondary);
  border-radius: var(--radius-sm);
  padding: 24px;
  transition: all var(--transition-fast);
}

.faq-item-plate[open] {
  background-color: var(--bg-white);
  border-color: var(--ink-blue);
}

.faq-item-plate summary {
  list-style: none;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
}

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

.faq-toggle-sign {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  font-weight: 400;
  color: var(--text-muted);
  transition: transform var(--transition-fast);
}

.faq-item-plate[open] .faq-toggle-sign {
  transform: rotate(45deg);
  color: var(--dark-burgundy);
}

.faq-answer-p {
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--text-secondary);
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--border-light);
}

/* ==========================================================================
   Article & Editorial Template (Exhibition Document)
   ========================================================================== */
.article-header-curatorial {
  padding: 64px 0 40px 0;
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
}

.article-header-inner {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.museum-breadcrumb {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.museum-breadcrumb a {
  color: var(--ink-blue);
}

.museum-breadcrumb a:hover {
  text-decoration: underline;
}

.article-h1 {
  font-size: 2.3rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.35;
  color: var(--text-primary);
}

.article-lead {
  font-size: 1.1rem;
  line-height: 1.8;
  color: var(--text-secondary);
}

.article-curatorial-meta {
  display: flex;
  align-items: center;
  gap: 24px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border-color);
  padding-top: 16px;
  flex-wrap: wrap;
}

/* Quick Answer Section (GEO search extraction) */
.quick-answer {
  background-color: #F1EFEA;
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--dark-burgundy);
  padding: 24px 28px;
  border-radius: var(--radius-xs);
  margin: 40px 0;
}

.quick-answer h2 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.quick-answer p {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--text-secondary);
}

/* Exhibition Index (TOC) */
.toc-exhibition-box {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 24px 28px;
  border-radius: var(--radius-sm);
  margin: 36px 0;
}

.toc-exhibition-box h3 {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  margin-bottom: 16px;
  text-transform: uppercase;
}

.toc-links-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.toc-links-list a {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--ink-blue);
  display: flex;
  align-items: center;
  gap: 8px;
}

.toc-links-list a:hover {
  color: var(--dark-burgundy);
  text-decoration: underline;
}

/* Article Body Content */
.article-main-body {
  padding: 48px 0 80px 0;
  background-color: var(--bg-secondary);
}

.editorial-prose {
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--text-secondary);
}

.editorial-prose h2 {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--text-primary);
  margin: 48px 0 20px 0;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-color);
  letter-spacing: -0.02em;
}

.editorial-prose h3 {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 32px 0 16px 0;
}

.editorial-prose p {
  margin-bottom: 22px;
}

.editorial-prose ul,
.editorial-prose ol {
  margin: 20px 0 24px 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.editorial-prose ul {
  list-style: square;
}

.editorial-prose ol {
  list-style: decimal;
}

.editorial-prose li {
  padding-left: 4px;
}

/* Editorial Tables */
.editorial-table-wrap {
  overflow-x: auto;
  margin: 32px 0;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background-color: var(--bg-white);
}

.editorial-prose table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.9rem;
}

.editorial-prose th,
.editorial-prose td {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border-light);
}

.editorial-prose th {
  background-color: var(--bg-stone);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.8rem;
  color: var(--text-primary);
  letter-spacing: 0.06em;
}

.editorial-prose tr:last-child td {
  border-bottom: none;
}

/* Curated Reading (Related Articles) */
.curated-reading-section {
  padding: 64px 0;
  background-color: var(--bg-primary);
  border-top: 1px solid var(--border-color);
}

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

.curated-card {
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  padding: 24px;
  border-radius: var(--radius-sm);
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: all var(--transition-fast);
}

.curated-card:hover {
  transform: translateY(-3px);
  border-color: var(--text-primary);
}

.curated-card h4 {
  font-size: 1.1rem;
  font-weight: 700;
  line-height: 1.4;
}

.curated-card p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-top: auto;
}

/* ==========================================================================
   Category Page: GALLERY COLLECTION
   ========================================================================== */
.category-hero-collection {
  padding: 72px 0 48px 0;
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
}

.category-articles-index {
  padding: 72px 0;
  background-color: var(--bg-primary);
}

.catalogue-index-list {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--border-color);
  background-color: var(--bg-white);
  border-radius: var(--radius-sm);
}

.catalogue-index-row {
  display: grid;
  grid-template-columns: 160px 1fr 140px;
  padding: 28px 32px;
  align-items: center;
  border-bottom: 1px solid var(--border-color);
  transition: background-color var(--transition-fast);
}

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

.catalogue-index-row:hover {
  background-color: var(--bg-secondary);
}

.index-row-num {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-muted);
}

.index-row-title-desc h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.index-row-title-desc p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.index-row-action {
  text-align: right;
}

/* ==========================================================================
   Footer: COMPACT LIGHT FOOTER (#FAF9F6 / 260px-340px)
   ========================================================================== */
.closing-gallery,
.compact-light-footer {
  background-color: #FAF9F6;
  border-top: 1px solid #D7D8D2;
  color: #171918;
  padding: 48px 0 32px 0;
  margin-top: auto;
}

.footer-main-row {
  display: grid;
  grid-template-columns: 30% 70%;
  column-gap: 40px;
  row-gap: 16px;
  align-items: start;
  padding-bottom: 32px;
}

/* Left 30%: Brand, Intro, Small CTA */
.footer-brand-pane {
  grid-column: 1;
  grid-row: 1;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-brand-title {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.footer-brand-title a {
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: #171918;
  text-decoration: none;
}

.footer-brand-sub {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: #6F756F;
}

.footer-intro-desc {
  font-size: 0.88rem;
  line-height: 1.6;
  color: #6F756F;
  margin: 0;
}

.footer-cta-wrapper {
  grid-column: 1;
  grid-row: 2;
  margin-top: 4px;
}

.footer-cta-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: var(--dark-burgundy);
  color: #FFFFFF !important;
  font-size: 0.85rem;
  font-weight: 600;
  padding: 8px 18px;
  border-radius: var(--radius-xs);
  text-decoration: none;
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.footer-cta-link:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}

/* Right 70%: 3 Columns */
.footer-columns-pane {
  grid-column: 2;
  grid-row: 1 / span 2;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.footer-nav-column {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-group-title {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: #171918;
  text-transform: uppercase;
}

.footer-links-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.footer-links-list li a {
  font-size: 0.88rem;
  color: #6F756F;
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-links-list li a:hover {
  color: #171918;
  text-decoration: underline;
}

/* Bottom Bar */
.footer-sub-bottom-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 20px;
  border-top: 1px solid #D7D8D2;
  font-size: 0.82rem;
  color: #6F756F;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-copy-text {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: #6F756F;
}

.footer-bottom-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
}

.footer-bottom-nav a {
  color: #6F756F;
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-bottom-nav a:hover {
  color: #171918;
}

.footer-sep {
  color: #D7D8D2;
  user-select: none;
}

/* ==========================================================================
   Responsive Breakpoints: 1024, 768, 430, 390, 375
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-gallery-grid {
    grid-template-columns: 1fr;
  }
  .hero-content-main {
    grid-column: 1 / -1;
  }
  .hero-wall-side {
    grid-column: 1 / -1;
  }
  .intro-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .room-network-layout {
    grid-template-columns: 1fr;
  }
  .room-visual-stat {
    border-right: none;
    padding-right: 0;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 24px;
  }
  .device-pedestals-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .regional-panels-container {
    grid-template-columns: repeat(2, 1fr);
  }
  .region-vertical-panel:nth-child(2) {
    border-right: none;
  }
  .region-vertical-panel:nth-child(1),
  .region-vertical-panel:nth-child(2) {
    border-bottom: 1px solid var(--border-color);
  }
  .pricing-pedestals-container {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-pedestal:nth-child(2) {
    border-right: none;
  }
  .pricing-pedestal:nth-child(1),
  .pricing-pedestal:nth-child(2) {
    border-bottom: 1px solid var(--border-color);
  }
  .faq-wall-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .faq-wall-aside {
    position: static;
  }
  .curatorial-columns {
    grid-template-columns: 1fr;
    gap: 32px;
  }
}

@media (max-width: 768px) {
  .container {
    padding: 0 20px;
  }
  .hero-brand-mega {
    font-size: 3rem;
  }
  .hero-title-h1 {
    font-size: 1.7rem;
  }
  .editorial-statement {
    font-size: 1.75rem;
  }
  .catalogue-spread-card,
  .catalogue-spread-reverse {
    grid-template-columns: 1fr;
  }
  .spread-num-pane {
    padding: 28px;
    border-right: none;
    border-bottom: 1px solid var(--border-color);
  }
  .catalogue-spread-reverse .spread-num-pane {
    order: 1;
    border-left: none;
    border-bottom: 1px solid var(--border-color);
  }
  .catalogue-spread-reverse .spread-content-pane {
    order: 2;
  }
  .spread-content-pane {
    padding: 28px;
  }
  .museum-labels-grid {
    grid-template-columns: 1fr;
  }
  .media-gallery-grid {
    grid-template-columns: 1fr;
  }
  .catalogue-index-row {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .index-row-action {
    text-align: left;
  }
  .curated-cards-grid {
    grid-template-columns: 1fr;
  }
  .footer-main-row {
    display: flex;
    flex-direction: column;
    gap: 28px;
    padding-bottom: 24px;
  }
  .footer-columns-pane {
    display: flex;
    flex-direction: column;
    gap: 24px;
  }
  .footer-cta-wrapper {
    margin-top: 0;
  }
  .footer-sub-bottom-bar {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }
}

@media (max-width: 430px) {
  .hero-brand-mega {
    font-size: 2.5rem;
  }
  .hero-title-h1 {
    font-size: 1.45rem;
  }
  .device-pedestals-grid {
    grid-template-columns: 1fr;
  }
  .regional-panels-container {
    grid-template-columns: 1fr;
  }
  .region-vertical-panel {
    border-right: none;
    border-bottom: 1px solid var(--border-color);
  }
  .region-vertical-panel:last-child {
    border-bottom: none;
  }
  .pricing-pedestals-container {
    grid-template-columns: 1fr;
  }
  .pricing-pedestal {
    border-right: none;
    border-bottom: 1px solid var(--border-color);
  }
  .pricing-pedestal:last-child {
    border-bottom: none;
  }
}

/* Accessibility: Respect Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}