/* ===================================================
   克拉云 KELAYUN - NEO BRUTALIST NETWORK DESIGN SYSTEM
   Theme: Hard Borders, Bold Grids, Asymmetric Blocks, Strong Typography
   =================================================== */

:root {
  --bg-main: #F4F0E7;
  --bg-secondary: #FFFDF7;
  --bg-light-gray: #ECEAE4;
  --text-primary: #111111;
  --text-body: #3E403E;
  --text-secondary: #747772;
  --border-dark: #111111;
  --accent-orange: #FF5A36;
  --accent-blue: #3568FF;
  --accent-yellow: #F2D64B;
  --bg-dark: #111111;
  --text-white: #FFFFFF;

  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;

  --border-1: 1px solid var(--border-dark);
  --border-2: 2px solid var(--border-dark);
  --border-3: 3px solid var(--border-dark);
  --shadow-hard: 3px 3px 0 var(--border-dark);
  --shadow-hard-lg: 5px 5px 0 var(--border-dark);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  background-color: var(--bg-main);
  color: var(--text-primary);
}

body {
  font-family: var(--font-sans);
  line-height: 1.55;
  background-color: var(--bg-main);
  color: var(--text-body);
  -webkit-font-smoothing: antialiased;
}

/* Typography Basics */
h1, h2, h3, h4, h5, h6 {
  color: var(--text-primary);
  font-weight: 850;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

p {
  margin-bottom: 1rem;
}

a {
  color: inherit;
  text-decoration: none;
  transition: background-color 0.15s ease, color 0.15s ease;
}

a:focus-visible, button:focus-visible {
  outline: 3px solid var(--accent-orange);
  outline-offset: 2px;
}

/* Brutalist Container */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding-left: 20px;
  padding-right: 20px;
}

/* ===================================================
   BRUTALIST MASTHEAD (Header)
   Left 28% Brand / Right 72% Nav & CTA separated by 2px line
   Desktop height ~86-100px
   =================================================== */
.masthead {
  background-color: var(--bg-secondary);
  border-bottom: var(--border-2);
  position: sticky;
  top: 0;
  z-index: 999;
}

.masthead-inner {
  display: flex;
  min-height: 88px;
  align-items: stretch;
}

/* Left Brand 28% */
.masthead-brand {
  width: 28%;
  min-width: 240px;
  padding: 16px 24px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  border-right: var(--border-2);
  background-color: var(--bg-secondary);
}

.brand-title {
  font-size: 26px;
  font-weight: 900;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.brand-title .brand-en {
  font-size: 14px;
  font-family: var(--font-mono);
  font-weight: 800;
  color: var(--accent-orange);
  letter-spacing: 0.05em;
}

.brand-sub {
  font-size: 11px;
  font-family: var(--font-mono);
  color: var(--text-secondary);
  letter-spacing: 0.1em;
  font-weight: 700;
  margin-top: 4px;
}

/* Right Nav 72% */
.masthead-content {
  width: 72%;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.masthead-row-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 24px;
  border-bottom: 1px solid var(--border-dark);
  font-size: 13px;
  font-weight: 750;
  background-color: var(--bg-secondary);
}

.masthead-links-primary {
  display: flex;
  gap: 20px;
  list-style: none;
}

.masthead-links-primary a {
  color: var(--text-primary);
  padding: 4px 6px;
}

.masthead-links-primary a:hover {
  background-color: var(--bg-light-gray);
}

.masthead-status-indicator {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 6px;
}

.status-dot {
  width: 8px;
  height: 8px;
  background-color: #10B981;
  border-radius: 50%;
  display: inline-block;
}

.masthead-row-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 24px;
  background-color: var(--bg-main);
  font-size: 13px;
  font-weight: 700;
}

.masthead-links-secondary {
  display: flex;
  gap: 18px;
  list-style: none;
}

.masthead-links-secondary a {
  color: var(--text-body);
  padding: 4px 6px;
}

.masthead-links-secondary a:hover {
  color: var(--text-primary);
  text-decoration: underline;
}

.masthead-cta-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background-color: var(--accent-orange);
  color: var(--text-white);
  padding: 8px 18px;
  font-size: 13px;
  font-weight: 850;
  border: var(--border-2);
  box-shadow: 2px 2px 0 var(--border-dark);
  letter-spacing: 0.02em;
}

.masthead-cta-btn:hover {
  background-color: #E64A27;
  transform: translate(-1px, -1px);
  box-shadow: 3px 3px 0 var(--border-dark);
}

/* Mobile Header Controls */
.mobile-menu-toggle {
  display: none;
  background: var(--bg-secondary);
  border: none;
  border-left: var(--border-2);
  padding: 0 20px;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 900;
  cursor: pointer;
  color: var(--text-primary);
}

.mobile-menu-drawer {
  display: none;
  background-color: var(--bg-secondary);
  border-bottom: var(--border-2);
}

.mobile-menu-drawer.is-open {
  display: block;
}

.mobile-menu-list {
  list-style: none;
  display: flex;
  flex-direction: column;
}

.mobile-menu-list li a {
  display: block;
  padding: 14px 20px;
  border-bottom: 1px solid var(--border-dark);
  font-weight: 800;
  font-size: 15px;
}

.mobile-menu-list li a:hover {
  background-color: var(--accent-yellow);
}

.mobile-menu-cta {
  padding: 16px 20px;
  background-color: var(--bg-main);
}

/* ===================================================
   HERO: ASYMMETRIC 2×2 BRUTALIST GRID
   Pure Grid, Typography, Color Blocks, Hard Borders, ZERO Images
   =================================================== */
.hero-section {
  border-bottom: var(--border-3);
  background-color: var(--bg-main);
}

.hero-grid {
  display: grid;
  grid-template-columns: 62% 38%;
  grid-template-rows: auto auto auto;
  border-left: var(--border-2);
  border-right: var(--border-2);
}

/* Row 1: Spans across full width */
.hero-block-brand {
  grid-column: 1 / -1;
  background-color: var(--bg-secondary);
  padding: 44px 40px;
  border-bottom: var(--border-2);
}

.hero-meta-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 850;
  color: var(--accent-orange);
  letter-spacing: 0.1em;
  margin-bottom: 16px;
  border-bottom: 2px solid var(--accent-orange);
  padding-bottom: 2px;
}

.hero-title-group {
  margin-bottom: 20px;
}

.hero-brand-name {
  font-size: 58px;
  font-weight: 950;
  letter-spacing: -0.03em;
  line-height: 1.05;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.hero-slogan {
  font-size: 52px;
  font-weight: 900;
  line-height: 1.1;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  margin-bottom: 14px;
}

.hero-h1-sub {
  font-size: 24px;
  font-weight: 750;
  color: var(--text-secondary);
  line-height: 1.35;
  letter-spacing: -0.01em;
}

.hero-intro-text {
  font-size: 17px;
  line-height: 1.65;
  color: var(--text-body);
  max-width: 820px;
  margin-top: 18px;
  margin-bottom: 0;
}

/* Row 2: 02 Global Network vs 03 Start CTA */
.hero-block-global {
  background-color: var(--bg-secondary);
  padding: 36px 36px;
  border-right: var(--border-2);
  border-bottom: var(--border-2);
  position: relative;
}

.accent-bar-blue {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 6px;
  background-color: var(--accent-blue);
}

.block-number {
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 900;
  color: var(--accent-orange);
  margin-bottom: 8px;
}

.block-heading-en {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 850;
  letter-spacing: 0.1em;
  color: var(--text-primary);
  text-transform: uppercase;
  margin-bottom: 14px;
}

.hero-region-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 22px;
}

.hero-region-tags span {
  background-color: var(--bg-light-gray);
  border: 1px solid var(--border-dark);
  padding: 6px 14px;
  font-size: 14px;
  font-weight: 750;
  color: var(--text-primary);
}

.hero-link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 800;
  color: var(--accent-blue);
  border-bottom: 2px solid var(--accent-blue);
  padding-bottom: 2px;
}

.hero-link-arrow:hover {
  color: var(--text-primary);
  border-bottom-color: var(--text-primary);
}

.hero-block-cta {
  background-color: var(--bg-secondary);
  padding: 36px 32px;
  border-bottom: var(--border-2);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.hero-cta-button-big {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: var(--accent-orange);
  color: var(--text-white);
  padding: 24px 28px;
  font-size: 24px;
  font-weight: 950;
  border: var(--border-2);
  box-shadow: 4px 4px 0 var(--border-dark);
  letter-spacing: -0.01em;
  margin-top: 16px;
}

.hero-cta-button-big:hover {
  background-color: #E64A27;
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 var(--border-dark);
}

/* Row 3: 04 AI vs 05 Device / Media */
.hero-block-ai {
  background-color: var(--bg-secondary);
  padding: 32px 36px;
  border-right: var(--border-2);
}

.hero-ai-tools-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.hero-ai-tools-list span {
  background-color: var(--bg-main);
  border: 1px solid var(--border-dark);
  padding: 5px 12px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 750;
  color: var(--text-primary);
}

.hero-block-device-media {
  background-color: var(--bg-secondary);
  padding: 32px 32px;
}

.hero-media-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.hero-media-tags span {
  background-color: var(--bg-light-gray);
  border: 1px solid var(--border-dark);
  padding: 5px 12px;
  font-size: 13px;
  font-weight: 700;
  color: var(--text-primary);
}

/* ===================================================
   SECTION 01: BRUTALIST MANIFESTO
   Left 25% Huge "01" / Right 75% Statement + 2-3 Paragraphs
   Bottom thick black line, NO card
   =================================================== */
.manifesto-section {
  background-color: var(--bg-main);
  border-bottom: var(--border-3);
  padding: 64px 0;
}

.manifesto-grid {
  display: flex;
  align-items: flex-start;
  gap: 40px;
}

.manifesto-left-number {
  width: 25%;
  min-width: 140px;
}

.huge-manifesto-number {
  font-family: var(--font-mono);
  font-size: 96px;
  font-weight: 950;
  line-height: 0.9;
  color: var(--text-primary);
  border-left: 6px solid var(--accent-orange);
  padding-left: 20px;
}

.manifesto-tag {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.12em;
  color: var(--text-secondary);
  margin-top: 12px;
}

.manifesto-right-content {
  width: 75%;
}

.manifesto-heading {
  font-size: 42px;
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 24px;
}

.manifesto-paragraphs p {
  font-size: 17px;
  line-height: 1.7;
  color: var(--text-body);
  margin-bottom: 16px;
}

.manifesto-paragraphs p:last-child {
  margin-bottom: 0;
}

/* ===================================================
   SECTION 02: ASYMMETRIC CAPABILITIES GRID
   Not 4 equal cards. Hard borders, asymmetric proportions.
   =================================================== */
.capabilities-section {
  background-color: var(--bg-main);
  border-bottom: var(--border-3);
  padding: 64px 0;
}

.section-header-brutalist {
  margin-bottom: 36px;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  border-bottom: var(--border-2);
  padding-bottom: 16px;
}

.section-tag-en {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 850;
  color: var(--accent-orange);
  letter-spacing: 0.1em;
}

.section-title-zh {
  font-size: 32px;
  font-weight: 900;
}

.capabilities-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  grid-template-rows: auto auto auto;
  border: var(--border-2);
  background-color: var(--border-dark);
  gap: 2px; /* Emulates 2px hard border between blocks */
}

.cap-block {
  background-color: var(--bg-secondary);
  padding: 36px;
  position: relative;
}

.cap-block-full {
  grid-column: 1 / -1;
}

.cap-number-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 900;
  padding: 4px 10px;
  background-color: var(--border-dark);
  color: var(--text-white);
  margin-bottom: 14px;
}

.cap-title {
  font-size: 24px;
  font-weight: 900;
  margin-bottom: 12px;
}

.cap-desc {
  font-size: 15px;
  color: var(--text-body);
  line-height: 1.6;
  margin-bottom: 20px;
}

.cap-pill-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.cap-pill {
  font-size: 13px;
  font-weight: 750;
  padding: 6px 12px;
  background-color: var(--bg-light-gray);
  border: 1px solid var(--border-dark);
}

/* ===================================================
   SECTION 03: ALTERNATING REGION BLOCKS
   Full width rows, alternating huge number and heading/nodes
   Semantic h3, ul, li + HTML Table
   =================================================== */
.regions-section {
  background-color: var(--bg-main);
  border-bottom: var(--border-3);
  padding: 64px 0;
}

.region-row-container {
  display: flex;
  flex-direction: column;
  border: var(--border-2);
  background-color: var(--border-dark);
  gap: 2px;
}

.region-row {
  display: flex;
  background-color: var(--bg-secondary);
  align-items: stretch;
  min-height: 150px;
}

.region-row.alt-reverse {
  flex-direction: row-reverse;
}

.region-num-cell {
  width: 25%;
  min-width: 140px;
  padding: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-right: var(--border-2);
  background-color: var(--bg-light-gray);
}

.region-row.alt-reverse .region-num-cell {
  border-right: none;
  border-left: var(--border-2);
}

.huge-region-num {
  font-family: var(--font-mono);
  font-size: 64px;
  font-weight: 950;
  color: var(--text-primary);
  line-height: 1;
}

.region-info-cell {
  width: 75%;
  padding: 32px 36px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.region-name-h3 {
  font-size: 26px;
  font-weight: 900;
  margin-bottom: 12px;
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.region-name-h3 .region-en {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--accent-blue);
  font-weight: 800;
  letter-spacing: 0.08em;
}

.region-nodes-ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.region-nodes-ul li {
  background-color: var(--bg-main);
  border: 1px solid var(--border-dark);
  padding: 6px 14px;
  font-size: 14px;
  font-weight: 750;
}

/* Region Comparison HTML Table */
.region-table-wrapper {
  margin-top: 40px;
  border: var(--border-2);
  background-color: var(--bg-secondary);
  overflow-x: auto;
}

.brutalist-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 14px;
}

.brutalist-table th, .brutalist-table td {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border-dark);
  border-right: 1px solid var(--border-dark);
}

.brutalist-table th:last-child, .brutalist-table td:last-child {
  border-right: none;
}

.brutalist-table th {
  background-color: var(--bg-dark);
  color: var(--text-white);
  font-weight: 800;
  letter-spacing: 0.02em;
}

.brutalist-table tr:last-child td {
  border-bottom: none;
}

.brutalist-table tbody tr:hover {
  background-color: var(--bg-light-gray);
}

/* ===================================================
   SECTION 04: DEVICE SYSTEM (2×2 HARD GRID)
   WINDOWS 01, macOS 02, ANDROID 03, iPHONE 04
   3 warm white, 1 subtle tint
   =================================================== */
.device-section {
  background-color: var(--bg-main);
  border-bottom: var(--border-3);
  padding: 64px 0;
}

.device-2x2-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: auto auto;
  border: var(--border-2);
  background-color: var(--border-dark);
  gap: 2px;
}

.device-cell {
  background-color: var(--bg-secondary);
  padding: 38px 34px;
}

.device-cell.tint-cell {
  background-color: #FFF9E6; /* Subtle yellow tint for 1 cell */
}

.device-cell-top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--border-dark);
  padding-bottom: 12px;
}

.device-name {
  font-size: 26px;
  font-weight: 950;
  letter-spacing: -0.02em;
}

.device-num {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 900;
  color: var(--accent-orange);
}

.device-desc {
  font-size: 15px;
  color: var(--text-body);
  line-height: 1.6;
  margin-bottom: 16px;
}

.device-support-list {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 750;
  color: var(--text-secondary);
}

/* ===================================================
   SECTION 05: DIGITAL USE (AI + STREAMING)
   Diagonal / Offset Composition (Left ~65% AI, Right ~50% Streaming)
   =================================================== */
.digital-use-section {
  background-color: var(--bg-main);
  border-bottom: var(--border-3);
  padding: 64px 0;
}

.offset-composition-wrap {
  position: relative;
  min-height: 480px;
}

.offset-block-ai {
  width: 68%;
  background-color: var(--bg-secondary);
  border: var(--border-2);
  padding: 40px;
  box-shadow: var(--shadow-hard);
  position: relative;
  z-index: 1;
}

.offset-block-streaming {
  width: 54%;
  background-color: var(--bg-secondary);
  border: var(--border-2);
  padding: 36px;
  box-shadow: var(--shadow-hard-lg);
  margin-left: auto;
  margin-top: -60px; /* Offset overlapping effect without obscuring */
  position: relative;
  z-index: 2;
}

.offset-badge-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.offset-pill-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.offset-pill {
  background-color: var(--bg-main);
  border: 1px solid var(--border-dark);
  padding: 6px 14px;
  font-size: 14px;
  font-weight: 800;
}

/* ===================================================
   SECTION 06: PLANS (2×2 BRUTALIST PRICING GRID)
   LIGHT, DAILY, FOCUS (Recommended), MAX
   =================================================== */
.pricing-section {
  background-color: var(--bg-main);
  border-bottom: var(--border-3);
  padding: 64px 0;
}

.pricing-2x2-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: auto auto;
  border: var(--border-2);
  background-color: var(--border-dark);
  gap: 2px;
}

.plan-card {
  background-color: var(--bg-secondary);
  padding: 38px 34px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
}

.plan-card.plan-recommended {
  background-color: #FFFDF7;
}

.plan-top-accent-bar {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 8px;
  background-color: var(--accent-orange);
}

.plan-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 16px;
}

.plan-num {
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 900;
  color: var(--accent-orange);
}

.plan-name {
  font-size: 28px;
  font-weight: 950;
  letter-spacing: -0.02em;
}

.plan-badge-rec {
  background-color: var(--accent-orange);
  color: var(--text-white);
  font-size: 11px;
  font-weight: 850;
  letter-spacing: 0.08em;
  padding: 3px 8px;
  text-transform: uppercase;
}

.plan-pricing-row {
  margin-bottom: 16px;
  border-bottom: 1px solid var(--border-dark);
  padding-bottom: 16px;
}

.plan-traffic-gb {
  font-size: 34px;
  font-weight: 900;
  color: var(--text-primary);
  display: block;
  line-height: 1.1;
}

.plan-price-val {
  font-size: 46px;
  font-weight: 950;
  color: var(--text-primary);
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-top: 4px;
}

.plan-price-val small {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-secondary);
}

.plan-features-list {
  list-style: none;
  margin-bottom: 24px;
}

.plan-features-list li {
  font-size: 14px;
  font-weight: 650;
  color: var(--text-body);
  padding: 5px 0;
  border-bottom: 1px dashed var(--bg-light-gray);
  display: flex;
  align-items: center;
  gap: 8px;
}

.plan-features-list li::before {
  content: "■";
  font-size: 8px;
  color: var(--accent-orange);
}

.plan-cta-btn {
  display: block;
  text-align: center;
  background-color: var(--bg-dark);
  color: var(--text-white);
  padding: 14px 20px;
  font-size: 15px;
  font-weight: 850;
  border: var(--border-2);
  transition: transform 0.15s ease, background-color 0.15s ease;
}

.plan-cta-btn:hover {
  background-color: #2A2A2A;
  transform: translate(-2px, -2px);
  box-shadow: 3px 3px 0 var(--border-dark);
}

.plan-card.plan-recommended .plan-cta-btn {
  background-color: var(--accent-orange);
}

.plan-card.plan-recommended .plan-cta-btn:hover {
  background-color: #E64A27;
}

/* ===================================================
   SECTION 07: BLOG (BRUTALIST POSTER WALL)
   Asymmetric 3 Column Poster Grid (2x2, 1x1, 1x2, 2x1)
   Semantic <article> structure
   =================================================== */
.blog-section {
  background-color: var(--bg-main);
  border-bottom: var(--border-3);
  padding: 64px 0;
}

.poster-wall-header {
  border-bottom: var(--border-2);
  padding-bottom: 20px;
  margin-bottom: 36px;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
}

.poster-title-lead {
  font-size: 38px;
  font-weight: 950;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.poster-article-count {
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 900;
  color: var(--accent-orange);
}

.poster-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.poster-item {
  background-color: var(--bg-secondary);
  border: var(--border-2);
  padding: 30px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--shadow-hard);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.poster-item:hover {
  transform: translate(-3px, -3px);
  box-shadow: var(--shadow-hard-lg);
}

/* Asymmetric sizing */
.poster-item.poster-featured {
  grid-column: span 2;
  background-color: #FFFDF7;
}

.poster-item.poster-tall {
  grid-row: span 2;
}

.poster-meta-top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 12px;
  border-bottom: 1px solid var(--border-dark);
  padding-bottom: 8px;
}

.poster-num {
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 900;
  color: var(--accent-orange);
}

.poster-category {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 800;
  color: var(--accent-blue);
  text-transform: uppercase;
}

.poster-h3 {
  font-size: 20px;
  font-weight: 900;
  line-height: 1.35;
  margin-bottom: 12px;
}

.poster-item.poster-featured .poster-h3 {
  font-size: 26px;
}

.poster-summary {
  font-size: 14px;
  color: var(--text-body);
  line-height: 1.6;
  margin-bottom: 20px;
  flex-grow: 1;
}

.poster-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12px;
  font-family: var(--font-mono);
  color: var(--text-secondary);
  border-top: 1px solid var(--bg-light-gray);
  padding-top: 12px;
}

.poster-read-link {
  font-weight: 850;
  color: var(--text-primary);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.poster-read-link:hover {
  color: var(--accent-orange);
}

/* ===================================================
   SECTION 08: USER NOTES (BRUTALIST QUOTES)
   3 quotes, huge numbers, NO fake avatars/stars/roles
   =================================================== */
.notes-section {
  background-color: var(--bg-main);
  border-bottom: var(--border-3);
  padding: 64px 0;
}

.notes-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.note-item {
  background-color: var(--bg-secondary);
  border: var(--border-2);
  padding: 34px 28px;
  box-shadow: var(--shadow-hard);
}

.note-num {
  font-family: var(--font-mono);
  font-size: 32px;
  font-weight: 950;
  color: var(--accent-orange);
  margin-bottom: 16px;
  border-bottom: 2px solid var(--border-dark);
  padding-bottom: 6px;
}

.note-quote {
  font-size: 17px;
  font-weight: 750;
  line-height: 1.6;
  color: var(--text-primary);
}

/* ===================================================
   SECTION 09: FAQ (TWO PANEL FAQ SYSTEM)
   Left 35% Panel with 09 & Categories / Right 65% Questions
   Accordion expand inline with Utility Yellow background
   =================================================== */
.faq-section {
  background-color: var(--bg-main);
  border-bottom: var(--border-3);
  padding: 64px 0;
}

.faq-two-panel {
  display: flex;
  align-items: flex-start;
  gap: 40px;
}

.faq-left-panel {
  width: 35%;
  position: sticky;
  top: 110px;
}

.faq-big-num {
  font-family: var(--font-mono);
  font-size: 84px;
  font-weight: 950;
  color: var(--text-primary);
  line-height: 0.9;
  margin-bottom: 12px;
}

.faq-panel-title {
  font-size: 30px;
  font-weight: 900;
  margin-bottom: 24px;
}

.faq-cat-filter-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.faq-cat-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 850;
  padding: 8px 14px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-dark);
  letter-spacing: 0.05em;
}

.faq-right-panel {
  width: 65%;
  display: flex;
  flex-direction: column;
}

.faq-item {
  border-bottom: var(--border-2);
}

.faq-trigger {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  padding: 22px 0;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  cursor: pointer;
  font-family: inherit;
  font-size: 18px;
  font-weight: 850;
  color: var(--text-primary);
}

.faq-q-text {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.faq-idx {
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--accent-orange);
  font-weight: 900;
}

.faq-icon-arrow {
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 900;
  transition: transform 0.2s ease;
}

.faq-item.is-active .faq-icon-arrow {
  transform: rotate(45deg);
}

.faq-answer-body {
  display: none;
  padding: 18px 24px;
  background-color: var(--accent-yellow); /* Utility Yellow accent as specified */
  border-left: 4px solid var(--border-dark);
  margin-bottom: 18px;
  font-size: 15px;
  line-height: 1.65;
  color: var(--text-primary);
  font-weight: 550;
}

.faq-item.is-active .faq-answer-body {
  display: block;
}

/* ===================================================
   FOOTER: BRUTALIST FOOT STRIP
   Compact height (~220-300px), #111111 dark, NOT full-screen
   =================================================== */
.brutalist-footer {
  background-color: var(--bg-dark);
  color: #CCCCCC;
  border-top: var(--border-3);
  padding: 40px 0 28px 0;
  font-size: 13px;
}

.footer-top-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  border-bottom: 1px solid #333333;
  padding-bottom: 24px;
  margin-bottom: 24px;
}

.footer-brand-h2 {
  font-size: 24px;
  font-weight: 900;
  color: var(--text-white);
  letter-spacing: -0.02em;
}

.footer-brand-sub {
  font-family: var(--font-mono);
  font-size: 11px;
  color: #888888;
  letter-spacing: 0.1em;
  margin-top: 4px;
}

.footer-columns-group {
  display: flex;
  gap: 48px;
}

.footer-col-title {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 850;
  color: var(--accent-orange);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 10px;
}

.footer-col-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.footer-col-links a {
  color: #AAAAAA;
}

.footer-col-links a:hover {
  color: var(--text-white);
}

.footer-cta-col {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
}

.footer-cta-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background-color: var(--accent-orange);
  color: var(--text-white);
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 850;
  border: 1px solid var(--text-white);
  letter-spacing: 0.02em;
}

.footer-cta-link:hover {
  background-color: #E64A27;
}

.footer-bottom-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12px;
  color: #777777;
}

.footer-recommend-links {
  display: flex;
  gap: 16px;
}

.footer-recommend-links a {
  color: #888888;
}

.footer-recommend-links a:hover {
  color: #DDDDDD;
}

/* ===================================================
   BREADCRUMB SYSTEM
   =================================================== */
.breadcrumb-nav {
  background-color: var(--bg-secondary);
  border-bottom: var(--border-2);
  padding: 12px 0;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
}

.breadcrumb-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.breadcrumb-list li+li::before {
  content: "/";
  margin-right: 8px;
  color: var(--text-secondary);
}

.breadcrumb-list a {
  color: var(--text-primary);
}

.breadcrumb-list a:hover {
  color: var(--accent-orange);
  text-decoration: underline;
}

/* ===================================================
   ARTICLE & EDITORIAL STYLES (BRUTALIST EDITORIAL DOCUMENT)
   =================================================== */
.article-page-main {
  padding: 56px 0 80px 0;
}

.article-container {
  max-width: 920px;
  margin: 0 auto;
  padding: 0 20px;
}

.article-header {
  border-bottom: var(--border-3);
  padding-bottom: 32px;
  margin-bottom: 36px;
}

.article-top-meta {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 16px;
}

.article-top-num {
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 950;
  color: var(--accent-orange);
}

.article-category-badge {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 850;
  letter-spacing: 0.08em;
  padding: 4px 10px;
  background-color: var(--accent-blue);
  color: var(--text-white);
}

.article-h1 {
  font-size: 44px;
  font-weight: 950;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 18px;
}

.article-lead {
  font-size: 18px;
  line-height: 1.65;
  color: var(--text-body);
  margin-bottom: 20px;
}

.article-pub-meta {
  display: flex;
  align-items: center;
  gap: 20px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-secondary);
}

/* GEO Quick Answer Component (Utility Yellow Accent) */
.quick-answer {
  background-color: var(--accent-yellow);
  border: var(--border-2);
  box-shadow: var(--shadow-hard);
  padding: 24px 28px;
  margin-bottom: 36px;
}

.quick-answer h2 {
  font-size: 20px;
  font-weight: 900;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.quick-answer h2::before {
  content: "⚡";
}

.quick-answer p {
  font-size: 15px;
  line-height: 1.65;
  color: var(--text-primary);
  font-weight: 600;
  margin-bottom: 0;
}

/* Article Table of Contents (INDEX 01, 02, 03) */
.article-toc-box {
  background-color: var(--bg-secondary);
  border: var(--border-2);
  padding: 24px 28px;
  margin-bottom: 40px;
}

.article-toc-title {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 900;
  letter-spacing: 0.1em;
  margin-bottom: 14px;
  color: var(--text-primary);
  border-bottom: 1px solid var(--border-dark);
  padding-bottom: 6px;
}

.article-toc-list {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.article-toc-list a {
  font-size: 14px;
  font-weight: 750;
  color: var(--text-primary);
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.article-toc-list a:hover {
  color: var(--accent-orange);
  text-decoration: underline;
}

.article-toc-list span.toc-idx {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent-orange);
}

/* Article Body Typography */
.article-body h2 {
  font-size: 28px;
  font-weight: 900;
  margin-top: 48px;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: var(--border-2);
  letter-spacing: -0.01em;
}

.article-body h3 {
  font-size: 22px;
  font-weight: 850;
  margin-top: 32px;
  margin-bottom: 12px;
}

.article-body p {
  font-size: 16px;
  line-height: 1.75;
  color: var(--text-body);
  margin-bottom: 18px;
}

.article-body ul, .article-body ol {
  margin-bottom: 24px;
  padding-left: 24px;
}

.article-body li {
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-body);
  margin-bottom: 8px;
}

.article-body ol {
  counter-reset: custom-step;
  list-style: none;
  padding-left: 0;
}

.article-body ol li {
  counter-increment: custom-step;
  position: relative;
  padding-left: 42px;
  margin-bottom: 16px;
}

.article-body ol li::before {
  content: counter(custom-step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 900;
  color: var(--accent-orange);
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-dark);
  padding: 2px 6px;
}

.article-body blockquote {
  background-color: var(--bg-secondary);
  border-left: 4px solid var(--accent-orange);
  border: var(--border-1);
  border-left-width: 5px;
  border-left-color: var(--accent-orange);
  padding: 16px 20px;
  margin-bottom: 24px;
  font-style: normal;
  font-weight: 600;
}

.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 28px;
  background-color: var(--bg-secondary);
  border: var(--border-2);
}

.article-body th, .article-body td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-dark);
  border-right: 1px solid var(--border-dark);
  font-size: 14px;
}

.article-body th {
  background-color: var(--bg-dark);
  color: var(--text-white);
  font-weight: 850;
}

.article-body img, .article-body picture img {
  width: 100%;
  height: auto;
  border: var(--border-2);
  margin-bottom: 24px;
}

/* Internal Links Callout within Articles */
.related-guides-box {
  background-color: var(--bg-secondary);
  border: var(--border-2);
  padding: 24px;
  margin: 40px 0;
  box-shadow: var(--shadow-hard);
}

.related-guides-title {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 900;
  margin-bottom: 12px;
  color: var(--accent-orange);
  text-transform: uppercase;
}

.related-guides-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.related-guides-list a {
  font-size: 15px;
  font-weight: 800;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.related-guides-list a:hover {
  color: var(--accent-orange);
}

/* Article CTA Box */
.article-cta-banner {
  background-color: var(--bg-secondary);
  border: var(--border-2);
  padding: 32px;
  margin-top: 48px;
  text-align: center;
  box-shadow: var(--shadow-hard);
}

.article-cta-title {
  font-size: 24px;
  font-weight: 900;
  margin-bottom: 10px;
}

.article-cta-desc {
  font-size: 15px;
  color: var(--text-body);
  margin-bottom: 20px;
}

/* ===================================================
   CATEGORY ARCHIVE PAGE STYLES (BRUTALIST ARCHIVE GRID)
   =================================================== */
.archive-hero {
  border-bottom: var(--border-3);
  padding: 56px 0;
  background-color: var(--bg-secondary);
}

.archive-top-num {
  font-family: var(--font-mono);
  font-size: 72px;
  font-weight: 950;
  line-height: 0.9;
  color: var(--accent-orange);
  margin-bottom: 12px;
}

.archive-h1 {
  font-size: 40px;
  font-weight: 950;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.archive-intro-text {
  font-size: 17px;
  line-height: 1.7;
  color: var(--text-body);
  max-width: 820px;
}

.archive-list-section {
  padding: 56px 0 80px 0;
}

.archive-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

/* ===================================================
   LEGAL / ABOUT / SITEMAP / 404 STYLES
   =================================================== */
.content-box-page {
  background-color: var(--bg-secondary);
  border: var(--border-2);
  padding: 48px;
  margin: 56px auto 80px auto;
  max-width: 960px;
  box-shadow: var(--shadow-hard-lg);
}

.legal-section-block {
  margin-bottom: 36px;
  border-bottom: 1px solid var(--border-dark);
  padding-bottom: 28px;
}

.legal-num {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 950;
  color: var(--accent-orange);
  margin-bottom: 8px;
}

.sitemap-directory-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
  margin-top: 32px;
}

.sitemap-group {
  border: var(--border-2);
  background-color: var(--bg-main);
  padding: 24px;
}

.sitemap-group-title {
  font-size: 20px;
  font-weight: 900;
  margin-bottom: 16px;
  border-bottom: 2px solid var(--border-dark);
  padding-bottom: 6px;
}

.sitemap-links-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.sitemap-links-list a {
  font-size: 14px;
  font-weight: 750;
  color: var(--text-primary);
}

.sitemap-links-list a:hover {
  color: var(--accent-orange);
}

/* 404 Specific */
.error-404-wrap {
  text-align: center;
  padding: 80px 20px;
}

.error-404-big {
  font-family: var(--font-mono);
  font-size: 140px;
  font-weight: 950;
  line-height: 0.9;
  color: var(--accent-orange);
  letter-spacing: -0.05em;
  margin-bottom: 16px;
}

.error-404-h1 {
  font-size: 32px;
  font-weight: 900;
  margin-bottom: 16px;
}

.error-404-p {
  font-size: 16px;
  color: var(--text-body);
  max-width: 520px;
  margin: 0 auto 32px auto;
}

.error-cta-group {
  display: flex;
  justify-content: center;
  gap: 16px;
}

/* ===================================================
   RESPONSIVE DESIGN SYSTEM
   Tested breakpoints: 375, 390, 430, 768, 1024, 1440
   =================================================== */

@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }
  .hero-block-global, .hero-block-ai {
    border-right: none;
  }
  .capabilities-grid {
    grid-template-columns: 1fr;
  }
  .pricing-2x2-grid {
    grid-template-columns: 1fr;
  }
  .poster-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .poster-item.poster-featured {
    grid-column: span 2;
  }
  .notes-grid {
    grid-template-columns: 1fr;
  }
  .faq-two-panel {
    flex-direction: column;
    gap: 24px;
  }
  .faq-left-panel {
    width: 100%;
    position: static;
  }
  .faq-right-panel {
    width: 100%;
  }
  .offset-block-ai, .offset-block-streaming {
    width: 100%;
    margin-top: 0;
  }
  .offset-block-streaming {
    margin-top: 20px;
  }
}

@media (max-width: 768px) {
  /* Header Masthead Mobile */
  .masthead-inner {
    min-height: 64px;
    align-items: center;
    justify-content: space-between;
  }
  .masthead-brand {
    width: auto;
    min-width: unset;
    border-right: none;
    padding: 12px 16px;
  }
  .brand-title {
    font-size: 22px;
  }
  .brand-sub {
    display: none;
  }
  .masthead-content {
    display: none; /* Collapses into mobile toggle */
  }
  .mobile-menu-toggle {
    display: block;
    height: 64px;
  }

  /* Typography Mobile Scaling */
  .hero-brand-name {
    font-size: 40px;
  }
  .hero-slogan {
    font-size: 38px;
  }
  .hero-h1-sub {
    font-size: 19px;
  }
  .manifesto-heading {
    font-size: 28px;
  }
  .section-title-zh {
    font-size: 26px;
  }
  .article-h1 {
    font-size: 32px;
  }
  .archive-h1 {
    font-size: 30px;
  }

  /* Manifesto Section Mobile */
  .manifesto-grid {
    flex-direction: column;
    gap: 16px;
  }
  .manifesto-left-number {
    width: 100%;
  }
  .huge-manifesto-number {
    font-size: 64px;
  }
  .manifesto-right-content {
    width: 100%;
  }

  /* Regions Mobile */
  .region-row, .region-row.alt-reverse {
    flex-direction: column;
  }
  .region-num-cell, .region-row.alt-reverse .region-num-cell {
    width: 100%;
    border-right: none;
    border-left: none;
    border-bottom: var(--border-2);
    padding: 16px 20px;
    justify-content: flex-start;
  }
  .huge-region-num {
    font-size: 42px;
  }
  .region-info-cell {
    width: 100%;
    padding: 20px;
  }

  /* Device 2×2 to 1 column */
  .device-2x2-grid {
    grid-template-columns: 1fr;
  }

  /* Blog Poster Wall Mobile */
  .poster-grid {
    grid-template-columns: 1fr;
  }
  .poster-item.poster-featured {
    grid-column: span 1;
  }
  .poster-item.poster-tall {
    grid-row: span 1;
  }

  /* Archive Grid */
  .archive-grid {
    grid-template-columns: 1fr;
  }
  .sitemap-directory-grid {
    grid-template-columns: 1fr;
  }

  /* Footer Mobile */
  .footer-top-row {
    flex-direction: column;
    gap: 24px;
  }
  .footer-columns-group {
    flex-wrap: wrap;
    gap: 28px;
  }
  .footer-cta-col {
    align-items: flex-start;
  }
  .footer-bottom-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
  }
  .footer-recommend-links {
    flex-direction: column;
    gap: 6px;
  }
}

@media (max-width: 430px) {
  /* Micro screen adjustment for 375, 390, 430 */
  .hero-block-brand {
    padding: 28px 18px;
  }
  .hero-brand-name {
    font-size: 34px;
  }
  .hero-slogan {
    font-size: 32px;
  }
  .hero-block-global, .hero-block-cta, .hero-block-ai, .hero-block-device-media {
    padding: 24px 18px;
  }
  .content-box-page {
    padding: 24px 18px;
  }
}

/* Accessibility: prefers-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;
  }
}