/* ==========================================================================
   BoostNet机场 - Modern Chinese Serif & 3D Network Cube Design System
   Color Palette:
   - Ivory: #FCFBF7 (Background / Pure Light)
   - Deep Forest: #20483E (Primary Brand / Headings / Dark Panels)
   - Sage: #A9C7AF (Secondary Accent / Soft Highlights / Tags)
   - Muted Copper: #B38A67 (Warm Metallic Accent / Badges / CTA Accent)
   ========================================================================== */

:root {
  --color-ivory: #FCFBF7;
  --color-ivory-warm: #F6F3EB;
  --color-ivory-card: #FFFFFF;
  --color-forest: #20483E;
  --color-forest-dark: #16332B;
  --color-forest-soft: #2B5D50;
  --color-forest-tint: rgba(32, 72, 62, 0.06);
  --color-forest-border: rgba(32, 72, 62, 0.15);
  --color-sage: #A9C7AF;
  --color-sage-light: #E7EFE9;
  --color-copper: #B38A67;
  --color-copper-dark: #916947;
  --color-copper-light: #F7EFE9;
  --color-text-main: #1D2D27;
  --color-text-muted: #4B6358;
  --color-text-dim: #768E84;
  --font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "SimSun", "STSong", Georgia, serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, Courier, monospace;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  --shadow-sm: 0 2px 6px rgba(32, 72, 62, 0.05);
  --shadow-md: 0 8px 24px rgba(32, 72, 62, 0.08);
  --shadow-lg: 0 16px 40px rgba(32, 72, 62, 0.12);
  --container-max: 1240px;
}

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

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

body {
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.68;
  background-color: var(--color-ivory);
  color: var(--color-text-main);
  overflow-x: hidden;
  min-height: 100vh;
}

/* Headings with Chinese Serif */
h1, h2, h3, h4, .serif-font {
  font-family: var(--font-serif);
  color: var(--color-forest);
  line-height: 1.25;
  font-weight: 700;
  letter-spacing: -0.01em;
}

h1 {
  font-size: 36px; /* Mobile first default */
}

@media (min-width: 1024px) {
  h1 {
    font-size: 58px; /* Desktop required */
    line-height: 1.18;
  }
}

h2 {
  font-size: 28px;
  margin-bottom: 12px;
}

@media (min-width: 1024px) {
  h2 {
    font-size: 38px;
    margin-bottom: 16px;
  }
}

h3 {
  font-size: 20px;
  line-height: 1.35;
}

p {
  font-size: 17px; /* Body 17px required */
  color: var(--color-text-muted);
}

a {
  color: var(--color-forest);
  text-decoration: none;
  transition: color 0.2s ease, border-color 0.2s ease;
}

a:hover {
  color: var(--color-copper);
}

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

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 20px;
}

@media (min-width: 768px) {
  .container {
    padding: 0 32px;
  }
}

/* Section Common Spacing */
.section-py {
  padding: 64px 0;
}

@media (min-width: 1024px) {
  .section-py {
    padding: 96px 0;
  }
}

.section-head {
  text-align: center;
  max-width: 820px;
  margin: 0 auto 48px auto;
}

.section-kicker {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-copper);
  background: var(--color-copper-light);
  padding: 4px 14px;
  border-radius: var(--radius-full);
  margin-bottom: 12px;
  border: 1px solid rgba(179, 138, 103, 0.2);
}

.section-desc {
  font-size: 17px;
  line-height: 1.7;
  color: var(--color-text-muted);
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(252, 251, 247, 0.94);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-forest-border);
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 700;
  color: var(--color-forest);
}

.brand-logo img {
  width: 34px;
  height: 34px;
  border-radius: 8px;
}

.brand-badge {
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 600;
  background: var(--color-sage-light);
  color: var(--color-forest);
  padding: 2px 8px;
  border-radius: 4px;
  border: 1px solid rgba(32, 72, 62, 0.12);
}

.desktop-nav {
  display: none;
}

@media (min-width: 1024px) {
  .desktop-nav {
    display: flex;
    align-items: center;
    gap: 28px;
  }
}

.desktop-nav a {
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text-main);
  position: relative;
  padding: 6px 0;
}

.desktop-nav a::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-copper);
  transition: width 0.2s ease;
}

.desktop-nav a:hover::after,
.desktop-nav a.active::after {
  width: 100%;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Primary Commercial CTA Button */
.btn-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: linear-gradient(135deg, var(--color-forest) 0%, var(--color-forest-dark) 100%);
  color: #FFFFFF !important;
  font-size: 15px;
  font-weight: 600;
  padding: 10px 22px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255, 255, 255, 0.15);
  box-shadow: 0 4px 12px rgba(32, 72, 62, 0.22);
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
  cursor: pointer;
  white-space: nowrap;
}

.btn-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(32, 72, 62, 0.32);
  color: #FFFFFF !important;
}

.btn-cta-copper {
  background: linear-gradient(135deg, var(--color-copper) 0%, var(--color-copper-dark) 100%);
  box-shadow: 0 4px 14px rgba(179, 138, 103, 0.28);
}

.btn-cta-copper:hover {
  box-shadow: 0 6px 20px rgba(179, 138, 103, 0.38);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: #FFFFFF;
  color: var(--color-forest) !important;
  font-size: 15px;
  font-weight: 600;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-forest-border);
  box-shadow: var(--shadow-sm);
  transition: all 0.2s ease;
}

.btn-secondary:hover {
  background: var(--color-ivory-warm);
  border-color: var(--color-forest);
  color: var(--color-forest) !important;
}

.mobile-menu-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  background: #FFFFFF;
  border: 1px solid var(--color-forest-border);
  border-radius: var(--radius-sm);
  color: var(--color-forest);
  cursor: pointer;
}

@media (min-width: 1024px) {
  .mobile-menu-btn {
    display: none;
  }
}

.mobile-menu-drawer {
  display: none;
  background: var(--color-ivory);
  border-bottom: 1px solid var(--color-forest-border);
  padding: 20px;
}

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

.mobile-nav-links {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 20px;
}

.mobile-nav-links a {
  font-size: 16px;
  font-weight: 500;
  color: var(--color-forest);
  padding: 8px 0;
  border-bottom: 1px dashed rgba(32, 72, 62, 0.1);
}

/* ==========================================================================
   Hero Section & 3D Network Cubes
   ========================================================================== */
.hero-section {
  position: relative;
  padding: 40px 0 60px 0;
  overflow: hidden;
  background: radial-gradient(circle at 85% 30%, rgba(169, 199, 175, 0.15) 0%, rgba(252, 251, 247, 0) 65%);
}

@media (min-width: 1024px) {
  .hero-section {
    padding: 60px 0 90px 0;
  }
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  align-items: center;
}

@media (min-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1.15fr 0.85fr;
    gap: 48px;
  }
}

.hero-copy {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.hero-badge-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  background: var(--color-sage-light);
  color: var(--color-forest);
  border: 1px solid rgba(169, 199, 175, 0.6);
}

.hero-badge-copper {
  background: var(--color-copper-light);
  color: var(--color-copper-dark);
  border-color: rgba(179, 138, 103, 0.3);
}

.hero-title {
  color: var(--color-forest);
}

.hero-lead {
  font-size: 17px;
  line-height: 1.75;
  color: var(--color-text-muted);
}

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

.hero-feature-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--color-forest-border);
}

.feature-tag-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-forest);
}

.feature-tag-item svg {
  color: var(--color-copper);
}

/* --- 3D Cubes Stage & Cluster --- */
.hero-cubes-stage {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 380px;
  perspective: 1100px;
  -webkit-perspective: 1100px;
  user-select: none;
}

@media (min-width: 1024px) {
  .hero-cubes-stage {
    min-height: 440px;
  }
}

@media (max-width: 480px) {
  .hero-cubes-stage {
    min-height: 320px;
  }
  .cube-cluster {
    width: 320px;
    height: 320px;
    transform: scale(0.86);
    transform-origin: center center;
  }
}

.cube-cluster {
  position: relative;
  width: 360px;
  height: 360px;
  transform-style: preserve-3d;
  -webkit-transform-style: preserve-3d;
}

@media (min-width: 1024px) {
  .cube-cluster {
    width: 420px;
    height: 400px;
  }
}

/* Connecting SVG Lines Behind Cubes */
.cube-lines {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1;
}

/* Individual Cube Positions in Stage */
.cube-pos-1 {
  position: absolute;
  top: 25px;
  left: 20px;
  z-index: 10;
}

.cube-pos-2 {
  position: absolute;
  top: 20px;
  right: 20px;
  z-index: 10;
}

.cube-pos-3 {
  position: absolute;
  bottom: 25px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 10;
}

.cube-legend-caption {
  position: absolute;
  bottom: -15px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 12px;
  color: var(--color-text-dim);
  background: rgba(252, 251, 247, 0.9);
  padding: 2px 10px;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-forest-border);
  white-space: nowrap;
}

/* The 3D Cube Construction */
.cube-wrap {
  width: 90px;
  height: 90px;
  perspective: 900px;
}

@media (min-width: 1024px) {
  .cube-wrap {
    width: 96px;
    height: 96px;
  }
}

.cube {
  width: 100%;
  height: 100%;
  position: relative;
  transform-style: preserve-3d;
  -webkit-transform-style: preserve-3d;
  will-change: transform;
}

/* Slow, readable CSS rotations for the 3 distinct use-case cubes */
.cube-rotate-1 {
  animation: rotateCube1 28s infinite linear;
}

.cube-rotate-2 {
  animation: rotateCube2 32s infinite linear;
}

.cube-rotate-3 {
  animation: rotateCube3 30s infinite linear;
}

/* Paused when offscreen or marked */
.cube-cluster--paused .cube,
.cube.is-paused {
  animation-play-state: paused !important;
}

@keyframes rotateCube1 {
  0%   { transform: rotateX(15deg) rotateY(0deg); }
  100% { transform: rotateX(15deg) rotateY(360deg); }
}

@keyframes rotateCube2 {
  0%   { transform: rotateX(-12deg) rotateY(360deg); }
  100% { transform: rotateX(-12deg) rotateY(0deg); }
}

@keyframes rotateCube3 {
  0%   { transform: rotateX(18deg) rotateY(45deg); }
  100% { transform: rotateX(18deg) rotateY(405deg); }
}

/* Cube Faces */
.cube-face {
  position: absolute;
  width: 90px;
  height: 90px;
  background: rgba(252, 251, 247, 0.94);
  border: 1.5px solid var(--color-forest);
  border-radius: 8px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 6px;
  text-align: center;
  box-shadow: inset 0 0 12px rgba(169, 199, 175, 0.25);
  backface-visibility: visible;
  -webkit-backface-visibility: visible;
}

@media (min-width: 1024px) {
  .cube-face {
    width: 96px;
    height: 96px;
  }
}

.cube-face .face-title {
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 700;
  color: var(--color-forest);
  line-height: 1.2;
  margin-bottom: 2px;
}

.cube-face .face-tag {
  font-size: 9px;
  font-weight: 600;
  color: var(--color-copper);
  background: var(--color-copper-light);
  padding: 1px 4px;
  border-radius: 3px;
}

/* Face transforms for 90px cube (half dimension = 45px) */
.cube-face.face-front  { transform: rotateY(0deg) translateZ(45px); }
.cube-face.face-back   { transform: rotateY(180deg) translateZ(45px); }
.cube-face.face-right  { transform: rotateY(90deg) translateZ(45px); }
.cube-face.face-left   { transform: rotateY(-90deg) translateZ(45px); }
.cube-face.face-top    { transform: rotateX(90deg) translateZ(45px); background: #E7EFE9; }
.cube-face.face-bottom { transform: rotateX(-90deg) translateZ(45px); background: #F6F3EB; }

@media (min-width: 1024px) {
  .cube-face.face-front  { transform: rotateY(0deg) translateZ(48px); }
  .cube-face.face-back   { transform: rotateY(180deg) translateZ(48px); }
  .cube-face.face-right  { transform: rotateY(90deg) translateZ(48px); }
  .cube-face.face-left   { transform: rotateY(-90deg) translateZ(48px); }
  .cube-face.face-top    { transform: rotateX(90deg) translateZ(48px); background: #E7EFE9; }
  .cube-face.face-bottom { transform: rotateX(-90deg) translateZ(48px); background: #F6F3EB; }
}

/* Specific Cube Colors */
.cube-theme-nodes .cube-face {
  border-color: var(--color-forest);
}
.cube-theme-ai .cube-face {
  border-color: var(--color-copper);
}
.cube-theme-media .cube-face {
  border-color: var(--color-forest-soft);
}

/* Static view under reduced-motion */
@media (prefers-reduced-motion: reduce) {
  .cube {
    animation: none !important;
  }
  .cube-rotate-1 {
    transform: rotateX(20deg) rotateY(30deg) !important;
  }
  .cube-rotate-2 {
    transform: rotateX(15deg) rotateY(-35deg) !important;
  }
  .cube-rotate-3 {
    transform: rotateX(25deg) rotateY(45deg) !important;
  }
}

/* ==========================================================================
   Advantages / Benefits Section: One-Large / Two-Small Layout
   ========================================================================== */
.benefits-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

@media (min-width: 1024px) {
  .benefits-layout {
    grid-template-columns: 1.25fr 0.95fr;
    gap: 32px;
  }
}

.benefit-card {
  background: #FFFFFF;
  border: 1px solid var(--color-forest-border);
  border-radius: var(--radius-md);
  padding: 32px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.benefit-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-sage);
}

.benefit-large {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  background: linear-gradient(180deg, #FFFFFF 0%, #FAF8F2 100%);
  border-left: 4px solid var(--color-forest);
}

.benefit-small-col {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.benefit-small {
  border-left: 4px solid var(--color-copper);
}

.benefit-small:last-child {
  border-left: 4px solid var(--color-sage);
}

.benefit-icon-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-forest);
  background: var(--color-sage-light);
  padding: 4px 12px;
  border-radius: var(--radius-full);
  margin-bottom: 16px;
}

.benefit-card h3 {
  font-size: 23px;
  margin-bottom: 14px;
}

.benefit-card p {
  font-size: 16px;
  line-height: 1.7;
}

.benefit-arch-list {
  list-style: none;
  margin-top: 24px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

@media (min-width: 640px) {
  .benefit-arch-list {
    grid-template-columns: 1fr 1fr;
  }
}

.benefit-arch-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  background: #FFFFFF;
  padding: 12px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(32, 72, 62, 0.08);
}

.benefit-arch-item .arch-bullet {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-copper);
  margin-top: 7px;
  flex-shrink: 0;
}

.benefit-arch-item div strong {
  display: block;
  font-size: 14px;
  color: var(--color-forest);
}

.benefit-arch-item div span {
  font-size: 13px;
  color: var(--color-text-muted);
}

/* ==========================================================================
   Global Nodes: Horizontal Region Strip
   ========================================================================== */
.nodes-section {
  background: var(--color-ivory-warm);
  border-top: 1px solid var(--color-forest-border);
  border-bottom: 1px solid var(--color-forest-border);
}

.nodes-strip-container {
  position: relative;
  overflow: hidden;
}

.nodes-strip {
  display: flex;
  gap: 18px;
  overflow-x: auto;
  padding: 12px 4px 24px 4px;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.nodes-strip::-webkit-scrollbar {
  height: 6px;
}

.nodes-strip::-webkit-scrollbar-track {
  background: rgba(32, 72, 62, 0.06);
  border-radius: 4px;
}

.nodes-strip::-webkit-scrollbar-thumb {
  background: var(--color-sage);
  border-radius: 4px;
}

.node-card {
  flex: 0 0 260px;
  scroll-snap-align: start;
  background: #FFFFFF;
  border: 1px solid var(--color-forest-border);
  border-radius: var(--radius-md);
  padding: 20px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.node-card:hover {
  transform: translateY(-2px);
  border-color: var(--color-copper);
}

.node-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.node-flag-name {
  display: flex;
  align-items: center;
  gap: 8px;
}

.node-code {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 4px;
  background: var(--color-forest);
  color: #FFFFFF;
}

.node-region-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-forest);
}

.node-tier-tag {
  font-size: 11px;
  font-weight: 600;
  padding: 2px 6px;
  border-radius: 4px;
  background: var(--color-copper-light);
  color: var(--color-copper-dark);
}

.node-meta-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  font-size: 12px;
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px dashed rgba(32, 72, 62, 0.12);
}

.node-meta-item span {
  display: block;
  color: var(--color-text-dim);
}

.node-meta-item strong {
  color: var(--color-forest);
  font-family: var(--font-mono);
}

/* ==========================================================================
   Editorial Panels: AI Productivity & 4K Streaming Matrices
   ========================================================================== */
.editorial-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

@media (min-width: 1024px) {
  .editorial-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.editorial-panel {
  background: #FFFFFF;
  border: 1px solid var(--color-forest-border);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}

.panel-accent-ai {
  border-top: 5px solid var(--color-copper);
}

.panel-accent-media {
  border-top: 5px solid var(--color-forest);
}

.editorial-panel-header {
  margin-bottom: 24px;
}

.panel-kicker {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--color-copper);
  text-transform: uppercase;
  margin-bottom: 6px;
  display: block;
}

.editorial-panel h3 {
  font-size: 26px;
  margin-bottom: 10px;
}

.editorial-panel-intro {
  font-size: 15px;
  color: var(--color-text-muted);
  line-height: 1.65;
}

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

.scenario-card {
  background: var(--color-ivory);
  border: 1px solid rgba(32, 72, 62, 0.1);
  border-radius: var(--radius-sm);
  padding: 16px;
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.scenario-card:hover {
  background: #FFFFFF;
  border-color: var(--color-sage);
}

.scenario-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}

.scenario-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--color-forest);
  display: flex;
  align-items: center;
  gap: 8px;
}

.scenario-badge {
  font-size: 11px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 4px;
  background: var(--color-sage-light);
  color: var(--color-forest);
}

.scenario-desc {
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* ==========================================================================
   Pricing Section: 4-5 Pricing Tiers with Exactly One "推荐套餐"
   ========================================================================== */
.pricing-section {
  background: radial-gradient(circle at 50% 0%, rgba(169, 199, 175, 0.12) 0%, rgba(252, 251, 247, 0) 70%);
}

.pricing-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

@media (min-width: 640px) {
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .pricing-grid {
    grid-template-columns: repeat(4, 1fr);
    align-items: stretch;
  }
}

.pricing-card {
  background: #FFFFFF;
  border: 1px solid var(--color-forest-border);
  border-radius: var(--radius-md);
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.pricing-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

/* Recommended Tier */
.pricing-card.is-featured {
  border: 2px solid var(--color-copper);
  background: linear-gradient(180deg, #FFFFFF 0%, #FDFBF8 100%);
  box-shadow: 0 10px 30px rgba(179, 138, 103, 0.16);
}

.featured-pill {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-copper);
  color: #FFFFFF;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.05em;
  padding: 4px 16px;
  border-radius: var(--radius-full);
  box-shadow: 0 2px 8px rgba(179, 138, 103, 0.35);
  white-space: nowrap;
}

.tier-header {
  margin-bottom: 20px;
}

.tier-name {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 700;
  color: var(--color-forest);
  margin-bottom: 6px;
}

.tier-subtitle {
  font-size: 13px;
  color: var(--color-text-muted);
}

.tier-price-box {
  margin: 18px 0;
  padding: 16px 0;
  border-top: 1px solid rgba(32, 72, 62, 0.08);
  border-bottom: 1px solid rgba(32, 72, 62, 0.08);
}

.tier-price-row {
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.tier-currency {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-forest);
}

.tier-amount {
  font-size: 38px;
  font-weight: 700;
  line-height: 1;
  color: var(--color-forest);
  font-family: var(--font-serif);
}

.pricing-card.is-featured .tier-currency,
.pricing-card.is-featured .tier-amount {
  color: var(--color-copper);
}

.tier-period {
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text-dim);
  margin-left: 2px;
}

.tier-price-placeholder {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-forest);
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.tier-price-period {
  font-size: 13px;
  font-weight: 400;
  color: var(--color-text-dim);
}

.tier-editorial-note {
  font-size: 12px;
  color: var(--color-copper);
  margin-top: 6px;
  display: block;
  line-height: 1.4;
  font-weight: 500;
}

.tier-features {
  list-style: none;
  margin-bottom: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  flex-grow: 1;
}

.tier-features li {
  font-size: 14px;
  color: var(--color-text-main);
  display: flex;
  align-items: flex-start;
  gap: 8px;
}

.tier-features li svg {
  color: var(--color-forest);
  margin-top: 3px;
  flex-shrink: 0;
}

.tier-features li.dim {
  color: var(--color-text-dim);
}

.pricing-card .btn-cta {
  width: 100%;
}

/* ==========================================================================
   Article Cards: 3/2/1 Column Layout with Numbered Index
   ========================================================================== */
.articles-section {
  background: var(--color-ivory);
}

.articles-grid {
  display: grid;
  grid-template-columns: 1fr; /* Mobile: 1 column */
  gap: 24px;
}

@media (min-width: 640px) {
  .articles-grid {
    grid-template-columns: repeat(2, 1fr); /* Tablet: 2 columns */
  }
}

@media (min-width: 1024px) {
  .articles-grid {
    grid-template-columns: repeat(3, 1fr); /* Desktop: 3 columns */
    gap: 28px;
  }
}

.article-card {
  background: #FFFFFF;
  border: 1px solid var(--color-forest-border);
  border-radius: var(--radius-md);
  padding: 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
  position: relative;
}

.article-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-sage);
  box-shadow: var(--shadow-md);
}

.article-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.article-index {
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 700;
  color: var(--color-copper);
}

.article-category {
  font-size: 11px;
  font-weight: 600;
  background: var(--color-sage-light);
  color: var(--color-forest);
  padding: 3px 8px;
  border-radius: 4px;
}

.article-card h3 {
  font-size: 19px;
  margin-bottom: 10px;
  line-height: 1.4;
}

.article-card p {
  font-size: 14px;
  line-height: 1.65;
  color: var(--color-text-muted);
  margin-bottom: 20px;
}

.article-card-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-forest);
  border-top: 1px solid rgba(32, 72, 62, 0.08);
  padding-top: 14px;
}

.article-card-foot span {
  color: var(--color-copper);
  display: flex;
  align-items: center;
  gap: 4px;
}

/* ==========================================================================
   Testimonials: Sourced / Marked-Sample Feedback (No fake ratings)
   ========================================================================== */
.testimonials-section {
  background: var(--color-ivory-warm);
}

.testimonials-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

@media (min-width: 640px) {
  .testimonials-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .testimonials-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.testimonial-card {
  background: #FFFFFF;
  border: 1px solid var(--color-forest-border);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.testimonial-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.testimonial-sample-tag {
  font-size: 11px;
  font-weight: 700;
  color: var(--color-copper);
  background: var(--color-copper-light);
  padding: 2px 8px;
  border-radius: 4px;
}

.testimonial-quote {
  font-size: 14px;
  line-height: 1.65;
  color: var(--color-text-main);
  margin-bottom: 20px;
  font-style: normal;
}

.testimonial-source {
  border-top: 1px dashed rgba(32, 72, 62, 0.12);
  padding-top: 12px;
}

.testimonial-source strong {
  display: block;
  font-size: 13px;
  color: var(--color-forest);
}

.testimonial-source span {
  font-size: 12px;
  color: var(--color-text-dim);
}

/* ==========================================================================
   FAQ Section
   ========================================================================== */
.faq-section {
  background: var(--color-ivory);
}

.faq-list {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: #FFFFFF;
  border: 1px solid var(--color-forest-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color 0.2s ease;
}

.faq-item:hover {
  border-color: var(--color-sage);
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 22px 24px;
  background: none;
  border: none;
  text-align: left;
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 700;
  color: var(--color-forest);
  cursor: pointer;
  gap: 16px;
}

.faq-icon {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--color-sage-light);
  color: var(--color-forest);
  font-size: 18px;
  flex-shrink: 0;
  transition: transform 0.2s ease;
}

.faq-item.is-open .faq-icon {
  transform: rotate(45deg);
  background: var(--color-copper-light);
  color: var(--color-copper-dark);
}

.faq-answer {
  display: none;
  padding: 0 24px 22px 24px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text-muted);
  border-top: 1px solid rgba(32, 72, 62, 0.05);
}

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

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  background-color: var(--color-forest);
  color: rgba(252, 251, 247, 0.8);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 64px 0 32px 0;
  font-size: 14px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  margin-bottom: 48px;
}

@media (min-width: 640px) {
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .footer-grid {
    grid-template-columns: 2fr 1fr 1fr 1.2fr;
    gap: 48px;
  }
}

.footer-col h4 {
  font-family: var(--font-serif);
  font-size: 17px;
  color: #FCFBF7;
  margin-bottom: 18px;
  position: relative;
  padding-bottom: 8px;
}

.footer-col h4::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 28px;
  height: 2px;
  background-color: var(--color-copper);
}

.footer-col p {
  color: rgba(252, 251, 247, 0.7);
  font-size: 14px;
  line-height: 1.7;
  margin-bottom: 16px;
}

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

.footer-links a {
  color: rgba(252, 251, 247, 0.75);
  font-size: 14px;
  transition: color 0.2s ease, transform 0.2s ease;
  display: inline-block;
}

.footer-links a:hover {
  color: var(--color-sage);
  transform: translateX(3px);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding-top: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: center;
  justify-content: space-between;
  text-align: center;
  font-size: 13px;
  color: rgba(252, 251, 247, 0.6);
}

@media (min-width: 768px) {
  .footer-bottom {
    flex-direction: row;
    text-align: left;
  }
}

/* ==========================================================================
   Article Detail & Subpage Layouts
   ========================================================================== */
.page-container {
  max-width: 880px;
  margin: 0 auto;
  padding: 40px 20px 80px 20px;
}

@media (min-width: 768px) {
  .page-container {
    padding: 56px 24px 100px 24px;
  }
}

/* Breadcrumb */
.breadcrumb-trail {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--color-text-dim);
  margin-bottom: 24px;
}

.breadcrumb-trail a {
  color: var(--color-forest);
}

.breadcrumb-trail a:hover {
  color: var(--color-copper);
}

.breadcrumb-sep {
  opacity: 0.5;
}

/* Article Header */
.article-header {
  margin-bottom: 36px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--color-forest-border);
}

.article-header h1 {
  font-size: 32px;
  margin-bottom: 16px;
}

@media (min-width: 768px) {
  .article-header h1 {
    font-size: 42px;
  }
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 14px;
  color: var(--color-text-dim);
}

.article-meta span {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

/* Article Content Body */
.article-content {
  font-size: 17px;
  line-height: 1.8;
  color: var(--color-text-main);
}

.article-content p {
  margin-bottom: 20px;
}

.article-content h2 {
  font-size: 26px;
  margin: 40px 0 16px 0;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-forest-border);
}

.article-content h3 {
  font-size: 20px;
  margin: 28px 0 12px 0;
}

.article-content ul, .article-content ol {
  margin: 0 0 24px 24px;
}

.article-content li {
  margin-bottom: 8px;
}

.article-content blockquote {
  border-left: 4px solid var(--color-copper);
  background: var(--color-copper-light);
  padding: 16px 20px;
  margin: 24px 0;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 16px;
  color: var(--color-forest);
}

.article-content table {
  width: 100%;
  display: block;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border-collapse: collapse;
  margin: 28px 0;
  font-size: 15px;
}

.article-content th, .article-content td {
  padding: 12px 14px;
  border: 1px solid var(--color-forest-border);
  text-align: left;
}

.article-content th {
  background: var(--color-sage-light);
  color: var(--color-forest);
  font-weight: 700;
}

.article-content td {
  background: #FFFFFF;
}

/* Article Hero Image Container */
.article-hero-img-box {
  margin: 24px 0 36px 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--color-forest-border);
  box-shadow: var(--shadow-sm);
}

.article-hero-img-box img {
  width: 100%;
  height: auto;
}

/* Related Articles Box */
.related-articles-box {
  margin-top: 60px;
  padding-top: 36px;
  border-top: 2px solid var(--color-forest-border);
}

.related-articles-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 18px;
}

@media (min-width: 640px) {
  .related-articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.related-article-card {
  background: #FFFFFF;
  border: 1px solid var(--color-forest-border);
  border-radius: var(--radius-sm);
  padding: 18px;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.related-article-card:hover {
  transform: translateY(-2px);
  border-color: var(--color-copper);
}

.related-article-card h4 {
  font-family: var(--font-serif);
  font-size: 16px;
  margin-bottom: 6px;
  color: var(--color-forest);
}

.related-article-card p {
  font-size: 13px;
  color: var(--color-text-dim);
  line-height: 1.5;
}