/* ==========================================================================
   xxyun BRAND LANDING PAGE — BUTTER GEOMETRIC ART GALLERY THEME
   Palette:
     --bg: #FFFCED (Butter Cream Canvas)
     --butter: #F2E3A8 (Butter Yellow Accent)
     --lilac: #DCD0E9 (Pale Lilac)
     --cyan: #C9E3E1 (Pale Cyan)
     --apricot: #F0D1BD (Warm Apricot)
     --text: #424446 (Deep Charcoal Gray)
     --border: #424446 (Sharp Line Charcoal)
   Typography:
     Titles: Arial Black + PingFang SC / Hiragino Sans GB / Microsoft YaHei
     Body: System Sans-Serif
   Design Philosophy:
     Strict flat graphic aesthetics, right-angled geometry, circles/semicircles,
     fine 1px/1.5px lines, high whitespace, NO glassmorphism, NO pill badges,
     NO soft drop shadows.
   ========================================================================== */

:root {
  --bg: #FFFCED;
  --butter: #F2E3A8;
  --lilac: #DCD0E9;
  --cyan: #C9E3E1;
  --apricot: #F0D1BD;
  --text: #424446;
  --text-muted: #6E7072;
  --border: #424446;
  --border-light: rgba(66, 68, 70, 0.2);
  --white: #FFFFFF;
  --font-title: "Arial Black", -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "SF Mono", "Consolas", "Roboto Mono", "Courier New", monospace;
  --max-width: 1380px;
  --transition: 0.18s ease-in-out;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  background-color: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
  width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

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

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

/* Base Container */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 2rem;
  padding-right: 2rem;
}

/* Top Exhibition Ticker Bar */
.ticker-bar {
  background-color: var(--butter);
  border-bottom: 1.5px solid var(--border);
  padding: 0.5rem 0;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.ticker-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.ticker-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
}

.ticker-indicator {
  width: 8px;
  height: 8px;
  background-color: var(--text);
  display: inline-block;
}

/* Header & Navigation */
.site-header {
  border-bottom: 1.5px solid var(--border);
  background-color: var(--bg);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-wrapper {
  display: flex;
  justify-content: space-between;
  align-items: stretch;
  min-height: 72px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0 1.5rem 0 0;
  border-right: 1.5px solid var(--border);
  text-decoration: none;
}

.brand-symbol {
  width: 38px;
  height: 38px;
  background-color: var(--butter);
  border: 1.5px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-title);
  font-size: 1.25rem;
  font-weight: 900;
  line-height: 1;
}

.brand-meta {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-family: var(--font-title);
  font-size: 1.5rem;
  letter-spacing: -0.04em;
  line-height: 1;
  text-transform: lowercase;
}

.brand-sub {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--text-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.main-nav {
  display: flex;
  align-items: stretch;
  flex: 1;
  justify-content: flex-end;
}

.nav-links {
  display: flex;
  list-style: none;
  align-items: stretch;
}

.nav-item {
  display: flex;
  align-items: center;
  border-left: 1.5px solid var(--border);
  padding: 0 1.5rem;
  font-family: var(--font-title);
  font-size: 0.875rem;
  letter-spacing: 0.02em;
  transition: background-color var(--transition);
}

.nav-item:hover {
  background-color: var(--butter);
}

.nav-item.active {
  background-color: var(--lilac);
}

.nav-cta {
  background-color: var(--text);
  color: var(--bg);
  display: flex;
  align-items: center;
  padding: 0 2rem;
  font-family: var(--font-title);
  font-size: 0.875rem;
  letter-spacing: 0.04em;
  border-left: 1.5px solid var(--border);
  transition: background-color var(--transition), color var(--transition);
}

.nav-cta:hover {
  background-color: var(--butter);
  color: var(--text);
}

.mobile-menu-btn {
  display: none;
  padding: 0 1.5rem;
  align-items: center;
  justify-content: center;
  border-left: 1.5px solid var(--border);
  background: transparent;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 700;
}

/* Hero Section (Three-column unequal layout) */
.hero-section {
  border-bottom: 1.5px solid var(--border);
  background-color: var(--bg);
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 80px minmax(360px, 1.2fr) minmax(380px, 1fr);
  min-height: 640px;
}

/* Hero Left Column: Vertical Brand Marker */
.hero-col-left {
  border-right: 1.5px solid var(--border);
  background-color: var(--butter);
  padding: 2rem 0.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: center;
  text-align: center;
}

.vertical-brand-text {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  transform: rotate(180deg);
  font-family: var(--font-title);
  font-size: 1.125rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
}

.hero-coordinates {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  letter-spacing: 0.15em;
  color: var(--text-muted);
}

.hero-geo-stamp {
  width: 32px;
  height: 32px;
  border: 1.5px solid var(--border);
  background-color: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-title);
  font-size: 0.75rem;
}

/* Hero Center Column: Huge Compact Title & CTA */
.hero-col-center {
  padding: 3.5rem 3rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  border-right: 1.5px solid var(--border);
}

.hero-header-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.375rem 0.75rem;
  background-color: var(--cyan);
  border: 1.5px solid var(--border);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  width: fit-content;
  margin-bottom: 2rem;
}

.hero-headline {
  font-family: var(--font-title);
  font-size: clamp(2.5rem, 4.5vw, 4.25rem);
  line-height: 0.98;
  letter-spacing: -0.05em;
  text-transform: uppercase;
  margin-bottom: 1.5rem;
}

.hero-headline span.accent {
  background-color: var(--butter);
  padding: 0 0.25rem;
}

.hero-desc {
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--text);
  margin-bottom: 2.5rem;
  max-width: 540px;
}

.hero-cta-group {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.125rem 2rem;
  background-color: var(--text);
  color: var(--bg);
  border: 1.5px solid var(--border);
  font-family: var(--font-title);
  font-size: 1.0625rem;
  letter-spacing: 0.02em;
  transition: all var(--transition);
  text-decoration: none;
  box-shadow: 4px 4px 0 var(--border);
}

.btn-primary:hover {
  background-color: var(--butter);
  color: var(--text);
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 var(--border);
}

.btn-arrow {
  display: inline-block;
  font-size: 1.25rem;
  font-weight: 900;
  margin-left: 1rem;
}

.hero-spec-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  padding-top: 1.5rem;
  border-top: 1.5px solid var(--border-light);
  margin-top: 1rem;
}

.hero-spec-item {
  display: flex;
  flex-direction: column;
}

.spec-number {
  font-family: var(--font-title);
  font-size: 1.25rem;
  line-height: 1;
}

.spec-label {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-top: 0.25rem;
}

/* Hero Right Column: 3x3 Playable Puzzle */
.hero-col-right {
  background-color: var(--white);
  padding: 2.5rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.puzzle-card {
  border: 1.5px solid var(--border);
  background-color: var(--bg);
  padding: 1.5rem;
  box-shadow: 6px 6px 0 var(--border);
}

.puzzle-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 1.5px solid var(--border);
}

.puzzle-title-block h3 {
  font-family: var(--font-title);
  font-size: 1.125rem;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.puzzle-title-block p {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--text-muted);
  text-transform: uppercase;
}

.puzzle-stats {
  display: flex;
  gap: 1.25rem;
}

.stat-box {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
}

.stat-val {
  font-family: var(--font-title);
  font-size: 1.125rem;
  line-height: 1;
}

.stat-key {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  color: var(--text-muted);
  text-transform: uppercase;
}

/* Puzzle Board: 3x3 Grid */
.puzzle-board-wrapper {
  position: relative;
  width: 100%;
  max-width: 320px;
  margin: 0 auto 1.25rem auto;
}

.puzzle-board {
  width: 100%;
  aspect-ratio: 1 / 1;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  gap: 4px;
  background-color: var(--border);
  border: 2px solid var(--border);
  padding: 4px;
  position: relative;
  user-select: none;
}

/* Individual Puzzle Tile */
.puzzle-tile {
  width: 100%;
  height: 100%;
  background-color: var(--butter);
  border: 1.5px solid var(--border);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 0.5rem;
  position: relative;
  cursor: pointer;
  transition: transform 0.1s ease, background-color 0.15s ease;
  overflow: hidden;
}

.puzzle-tile:hover {
  filter: brightness(0.96);
}

.puzzle-tile.tile-empty {
  background-color: transparent;
  border: 1.5px dashed rgba(66, 68, 70, 0.3);
  cursor: default;
}

/* Palette Variations for Puzzle Tiles */
.puzzle-tile[data-id="1"] { background-color: var(--butter); }
.puzzle-tile[data-id="2"] { background-color: var(--lilac); }
.puzzle-tile[data-id="3"] { background-color: var(--cyan); }
.puzzle-tile[data-id="4"] { background-color: var(--apricot); }
.puzzle-tile[data-id="5"] { background-color: #E2E8D5; }
.puzzle-tile[data-id="6"] { background-color: var(--butter); }
.puzzle-tile[data-id="7"] { background-color: var(--lilac); }
.puzzle-tile[data-id="8"] { background-color: var(--cyan); }

/* Tile Number & Geometric Motif */
.tile-num {
  font-family: var(--font-title);
  font-size: 1.25rem;
  line-height: 1;
  font-weight: 900;
  z-index: 2;
}

.tile-geo {
  position: absolute;
  right: 6px;
  bottom: 6px;
  width: 38px;
  height: 38px;
  pointer-events: none;
}

/* Tile SVG Geometric Shapes */
.geo-shape {
  width: 100%;
  height: 100%;
}

/* Puzzle Controls & Mini Reference */
.puzzle-controls {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.puzzle-btn {
  flex: 1;
  padding: 0.625rem 0.5rem;
  border: 1.5px solid var(--border);
  background-color: var(--white);
  font-family: var(--font-title);
  font-size: 0.75rem;
  letter-spacing: 0.02em;
  text-align: center;
  transition: all var(--transition);
}

.puzzle-btn:hover {
  background-color: var(--butter);
}

.puzzle-btn-reset {
  background-color: var(--apricot);
}

.puzzle-footer-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  padding-top: 0.75rem;
  border-top: 1.5px solid var(--border-light);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--text-muted);
}

.puzzle-keyboard-hint {
  display: flex;
  align-items: center;
  gap: 0.375rem;
}

.kbd-key {
  display: inline-block;
  padding: 0.125rem 0.375rem;
  border: 1px solid var(--border);
  background-color: var(--white);
  font-weight: 700;
  color: var(--text);
  line-height: 1;
}

.puzzle-thumb-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  color: var(--text);
  font-weight: 700;
  text-decoration: underline;
  cursor: pointer;
}

/* Victory Overlay */
.puzzle-win-overlay {
  display: none;
  position: absolute;
  inset: 0;
  background-color: var(--butter);
  border: 2px solid var(--border);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  text-align: center;
  z-index: 10;
}

.puzzle-win-overlay.active {
  display: flex;
}

.win-title {
  font-family: var(--font-title);
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
}

.win-desc {
  font-size: 0.875rem;
  margin-bottom: 1rem;
}

/* Reference Modal */
.ref-modal {
  display: none;
  position: fixed;
  inset: 0;
  background-color: rgba(66, 68, 70, 0.7);
  z-index: 1000;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.ref-modal.active {
  display: flex;
}

.ref-modal-card {
  background-color: var(--bg);
  border: 2px solid var(--border);
  box-shadow: 8px 8px 0 var(--border);
  padding: 1.75rem;
  max-width: 360px;
  width: 100%;
}

.ref-modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
  border-bottom: 1.5px solid var(--border);
  padding-bottom: 0.5rem;
}

.ref-close-btn {
  font-family: var(--font-title);
  font-size: 1.25rem;
}

.ref-grid-preview {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 4px;
  background-color: var(--border);
  border: 1.5px solid var(--border);
  padding: 4px;
  aspect-ratio: 1 / 1;
}

.ref-cell {
  background-color: var(--butter);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-title);
  font-size: 1.25rem;
  border: 1px solid var(--border);
}

.ref-cell[data-id="2"] { background-color: var(--lilac); }
.ref-cell[data-id="3"] { background-color: var(--cyan); }
.ref-cell[data-id="4"] { background-color: var(--apricot); }
.ref-cell[data-id="5"] { background-color: #E2E8D5; }
.ref-cell[data-id="6"] { background-color: var(--butter); }
.ref-cell[data-id="7"] { background-color: var(--lilac); }
.ref-cell[data-id="8"] { background-color: var(--cyan); }
.ref-cell[data-id="9"] { background-color: var(--bg); color: var(--text-muted); font-size: 0.875rem; }

/* Section Header Typography */
.section-head {
  padding: 4rem 0 2rem 0;
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  border-bottom: 1.5px solid var(--border);
  margin-bottom: 3rem;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.section-head-left {
  max-width: 760px;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.section-title {
  font-family: var(--font-title);
  font-size: clamp(2rem, 3.5vw, 3rem);
  line-height: 1.05;
  letter-spacing: -0.04em;
  text-transform: uppercase;
}

.section-sub {
  font-size: 1.0625rem;
  color: var(--text);
  margin-top: 0.75rem;
  max-width: 600px;
}

.section-index {
  font-family: var(--font-title);
  font-size: 3.5rem;
  line-height: 0.8;
  color: var(--border-light);
  user-select: none;
}

/* ==========================================================================
   SECTION 1: Core Advantages (Numbered Posters)
   ========================================================================== */
.posters-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  margin-bottom: 5rem;
}

.poster-card {
  border: 1.5px solid var(--border);
  background-color: var(--white);
  padding: 2rem 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 380px;
  position: relative;
  transition: transform var(--transition), box-shadow var(--transition);
}

.poster-card:hover {
  transform: translate(-3px, -3px);
  box-shadow: 6px 6px 0 var(--border);
}

.poster-card:nth-child(1) { background-color: var(--butter); }
.poster-card:nth-child(2) { background-color: var(--lilac); }
.poster-card:nth-child(3) { background-color: var(--cyan); }
.poster-card:nth-child(4) { background-color: var(--apricot); }

.poster-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  border-bottom: 1.5px solid var(--border);
  padding-bottom: 1rem;
  margin-bottom: 1.5rem;
}

.poster-num {
  font-family: var(--font-title);
  font-size: 2.25rem;
  line-height: 1;
}

.poster-badge {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  padding: 0.25rem 0.5rem;
  border: 1px solid var(--border);
  background-color: var(--white);
  font-weight: 700;
}

.poster-body h3 {
  font-family: var(--font-title);
  font-size: 1.375rem;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

.poster-body p {
  font-size: 0.9375rem;
  line-height: 1.6;
}

.poster-art-motif {
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid rgba(66, 68, 70, 0.2);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.poster-mono-tag {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--text-muted);
  text-transform: uppercase;
}

/* ==========================================================================
   SECTION 2: Node Regions (Pure Text Coordinate Directory)
   ========================================================================== */
.nodes-section {
  border-top: 1.5px solid var(--border);
  padding-bottom: 5rem;
}

.directory-board {
  border: 1.5px solid var(--border);
  background-color: var(--white);
}

.directory-header-row {
  display: grid;
  grid-template-columns: 140px 180px 1.5fr 140px 120px 140px;
  background-color: var(--butter);
  border-bottom: 1.5px solid var(--border);
  padding: 0.875rem 1.5rem;
  font-family: var(--font-title);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.directory-item-row {
  display: grid;
  grid-template-columns: 140px 180px 1.5fr 140px 120px 140px;
  padding: 1.125rem 1.5rem;
  border-bottom: 1px solid var(--border-light);
  align-items: center;
  font-size: 0.875rem;
  transition: background-color var(--transition);
}

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

.directory-item-row:hover {
  background-color: #FFF9D9;
}

.node-code {
  font-family: var(--font-mono);
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.node-dot {
  width: 6px;
  height: 6px;
  background-color: #2F855A;
  display: inline-block;
}

.node-loc {
  font-family: var(--font-title);
  letter-spacing: -0.01em;
}

.node-spec {
  color: var(--text-muted);
  font-size: 0.8125rem;
}

.node-tag {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  display: inline-block;
  padding: 0.25rem 0.5rem;
  border: 1px solid var(--border);
  background-color: var(--bg);
  width: fit-content;
}

.node-status-online {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: #1A5A32;
}

/* ==========================================================================
   SECTION 3: AI & Streaming (Cross-column Editorial Layout)
   ========================================================================== */
.editorial-spread {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border: 1.5px solid var(--border);
  background-color: var(--white);
  margin-bottom: 5rem;
}

.editorial-col {
  padding: 3rem;
  display: flex;
  flex-direction: column;
}

.editorial-col:first-child {
  border-right: 1.5px solid var(--border);
  background-color: #FBFDF4;
}

.editorial-col:last-child {
  background-color: #FCF9FD;
}

.editorial-kicker {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.editorial-col h3 {
  font-family: var(--font-title);
  font-size: 1.875rem;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 1.5rem;
}

.editorial-lead {
  font-size: 1.0625rem;
  line-height: 1.7;
  margin-bottom: 2rem;
  color: var(--text);
}

.editorial-service-matrix {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-top: auto;
  padding-top: 2rem;
  border-top: 1.5px solid var(--border-light);
}

.service-card {
  border: 1.5px solid var(--border);
  padding: 1rem;
  background-color: var(--white);
}

.service-card-name {
  font-family: var(--font-title);
  font-size: 0.9375rem;
  margin-bottom: 0.25rem;
}

.service-card-desc {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--text-muted);
}

/* ==========================================================================
   SECTION 4: Five-Tier Plans (Horizontal Row Comparison Table)
   ========================================================================== */
.plans-section {
  border-top: 1.5px solid var(--border);
  padding-bottom: 5rem;
}

.plans-table-wrapper {
  border: 1.5px solid var(--border);
  background-color: var(--white);
  box-shadow: 6px 6px 0 var(--border);
}

.plans-head-row {
  display: grid;
  grid-template-columns: 180px 160px 1.4fr 120px 120px 140px 160px;
  background-color: var(--butter);
  border-bottom: 1.5px solid var(--border);
  padding: 1rem 1.5rem;
  font-family: var(--font-title);
  font-size: 0.8125rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  align-items: center;
}

.plans-body-row {
  display: grid;
  grid-template-columns: 180px 160px 1.4fr 120px 120px 140px 160px;
  padding: 1.5rem;
  border-bottom: 1.5px solid var(--border-light);
  align-items: center;
  transition: background-color var(--transition);
}

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

.plans-body-row:hover {
  background-color: #FFFAEC;
}

.plan-tier-name {
  font-family: var(--font-title);
  font-size: 1.125rem;
  letter-spacing: -0.02em;
}

.plan-tier-sub {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--text-muted);
}

.plan-bandwidth {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 700;
}

.plan-routing {
  font-size: 0.875rem;
  line-height: 1.5;
}

.plan-pending {
  display: inline-block;
  padding: 0.25rem 0.5rem;
  background-color: var(--apricot);
  border: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 700;
}

.plan-price-box {
  display: flex;
  flex-direction: column;
}

.plan-price {
  display: inline-flex;
  align-items: baseline;
  gap: 2px;
}

.price-currency {
  font-family: var(--font-title);
  font-size: 0.875rem;
  font-weight: 900;
}

.price-val {
  font-family: var(--font-title);
  font-size: 1.5rem;
  line-height: 1;
  letter-spacing: -0.04em;
}

.price-period {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.plan-price-sub {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--text-muted);
  margin-top: 2px;
}

.plan-speed {
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  font-weight: 700;
}

.plan-cta-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1rem;
  background-color: var(--text);
  color: var(--bg);
  border: 1.5px solid var(--border);
  font-family: var(--font-title);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  transition: all var(--transition);
}

.plan-cta-btn:hover {
  background-color: var(--butter);
  color: var(--text);
}

/* ==========================================================================
   SECTION 5: Testimonials (Curator Quotes)
   ========================================================================== */
.reviews-section {
  border-top: 1.5px solid var(--border);
  padding-bottom: 5rem;
}

.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.review-card {
  border: 1.5px solid var(--border);
  background-color: var(--white);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 300px;
}

.review-card:nth-child(1) { background-color: var(--bg); }
.review-card:nth-child(2) { background-color: var(--lilac); }
.review-card:nth-child(3) { background-color: var(--cyan); }

.review-quote {
  font-size: 1rem;
  line-height: 1.7;
  font-style: italic;
  margin-bottom: 1.5rem;
}

.review-author {
  border-top: 1.5px solid var(--border);
  padding-top: 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.author-name {
  font-family: var(--font-title);
  font-size: 0.9375rem;
}

.author-role {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--text-muted);
}

/* ==========================================================================
   SECTION 6: Nine Articles (Exhibition Catalog List)
   ========================================================================== */
.articles-section {
  border-top: 1.5px solid var(--border);
  padding-bottom: 5rem;
}

.catalog-list {
  display: flex;
  flex-direction: column;
  border: 1.5px solid var(--border);
  background-color: var(--white);
}

.catalog-item {
  display: grid;
  grid-template-columns: 80px 220px 1fr 140px;
  border-bottom: 1.5px solid var(--border-light);
  align-items: stretch;
  text-decoration: none;
  transition: background-color var(--transition);
}

.catalog-item:last-child {
  border-bottom: none;
}

.catalog-item:hover {
  background-color: #FFFCE8;
}

.catalog-idx {
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-title);
  font-size: 1.25rem;
  border-right: 1.5px solid var(--border-light);
  background-color: var(--butter);
}

.catalog-cover {
  padding: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-right: 1.5px solid var(--border-light);
}

.catalog-cover-art {
  width: 100%;
  height: 80px;
  border: 1.5px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.catalog-cover-art.art-1 { background-color: var(--butter); }
.catalog-cover-art.art-2 { background-color: var(--lilac); }
.catalog-cover-art.art-3 { background-color: var(--cyan); }
.catalog-cover-art.art-4 { background-color: var(--apricot); }
.catalog-cover-art.art-5 { background-color: #E2E8D5; }
.catalog-cover-art.art-6 { background-color: var(--butter); }
.catalog-cover-art.art-7 { background-color: var(--lilac); }
.catalog-cover-art.art-8 { background-color: var(--cyan); }
.catalog-cover-art.art-9 { background-color: var(--apricot); }

.catalog-info {
  padding: 1.5rem 2rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.catalog-category {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-bottom: 0.375rem;
}

.catalog-title {
  font-family: var(--font-title);
  font-size: 1.25rem;
  letter-spacing: -0.02em;
  line-height: 1.3;
  margin-bottom: 0.5rem;
}

.catalog-summary {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.catalog-action {
  border-left: 1.5px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  font-family: var(--font-title);
  font-size: 0.8125rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

/* ==========================================================================
   SECTION 7: Minimalist Line FAQ (Accordion)
   ========================================================================== */
.faq-section {
  border-top: 1.5px solid var(--border);
  padding-bottom: 6rem;
}

.faq-list {
  border-top: 1.5px solid var(--border);
}

.faq-item {
  border-bottom: 1.5px solid var(--border);
}

.faq-question {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.75rem 0.5rem;
  text-align: left;
  font-family: var(--font-title);
  font-size: 1.25rem;
  letter-spacing: -0.02em;
  background: none;
  cursor: pointer;
}

.faq-icon {
  width: 32px;
  height: 32px;
  border: 1.5px solid var(--border);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  transition: transform var(--transition);
}

.faq-item.active .faq-icon {
  background-color: var(--butter);
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease-out;
  padding: 0 0.5rem;
}

.faq-answer-inner {
  padding-bottom: 1.75rem;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text);
  max-width: 900px;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  border-top: 2px solid var(--border);
  background-color: var(--butter);
  padding: 4rem 0 2rem 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-col h4 {
  font-family: var(--font-title);
  font-size: 1rem;
  letter-spacing: -0.01em;
  text-transform: uppercase;
  margin-bottom: 1.25rem;
  border-bottom: 1.5px solid var(--border);
  padding-bottom: 0.5rem;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-links a {
  font-size: 0.875rem;
  transition: opacity var(--transition);
}

.footer-links a:hover {
  text-decoration: underline;
}

.footer-bottom {
  border-top: 1.5px solid var(--border);
  padding-top: 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.footer-aff-note {
  font-size: 0.6875rem;
  color: var(--text-muted);
}

/* ==========================================================================
   Responsive Adaptations (375px - 1440px)
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-grid {
    display: flex;
    flex-direction: column;
  }
  
  .hero-col-center {
    order: 1;
    border-right: none;
    border-bottom: 1.5px solid var(--border);
    padding: 2.5rem 1.5rem;
  }

  .hero-col-right {
    order: 2;
    padding: 2rem 1.5rem;
  }

  .hero-col-left {
    order: 3;
    display: none; /* Left vertical column collapsed on medium & mobile */
  }

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

  .directory-header-row,
  .directory-item-row {
    grid-template-columns: 100px 140px 1fr 100px;
  }
  .directory-header-row > *:nth-child(5),
  .directory-header-row > *:nth-child(6),
  .directory-item-row > *:nth-child(5),
  .directory-item-row > *:nth-child(6) {
    display: none;
  }

  .editorial-spread {
    grid-template-columns: 1fr;
  }

  .editorial-col:first-child {
    border-right: none;
    border-bottom: 1.5px solid var(--border);
  }

  .plans-table-wrapper {
    overflow-x: auto;
  }

  .plans-head-row,
  .plans-body-row {
    grid-template-columns: 160px 130px 1.3fr 110px 110px 140px 140px;
    min-width: 860px;
  }

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

  .catalog-item {
    grid-template-columns: 60px 1fr;
  }
  .catalog-cover,
  .catalog-action {
    display: none;
  }

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

@media (max-width: 768px) {
  .container {
    padding-left: 1.25rem;
    padding-right: 1.25rem;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background-color: var(--bg);
    border-bottom: 2px solid var(--border);
    flex-direction: column;
  }

  .nav-links.open {
    display: flex;
  }

  .nav-item {
    border-left: none;
    border-bottom: 1px solid var(--border-light);
    padding: 1rem 1.5rem;
  }

  .mobile-menu-btn {
    display: flex;
  }

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

  .directory-header-row {
    display: none;
  }

  .directory-item-row {
    grid-template-columns: 1fr;
    gap: 0.5rem;
    padding: 1rem;
  }

  .plans-table-wrapper {
    overflow-x: auto;
  }

  .plans-head-row,
  .plans-body-row {
    min-width: 820px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .hero-headline {
    font-size: 2.25rem;
  }

  .hero-spec-row {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }
}