@charset "UTF-8";
/* ==========================================================================
   FlyingBird 飞鸟云 - Neo-Brutalist Block Puzzle Design System
   Pure Native CSS | Responsive | High-Legibility System Chinese Fonts
   ========================================================================== */

/* --- Custom Properties / CSS Variables --- */
:root {
  --bg-canvas: #FAF8F5;
  --bg-surface: #FFFFFF;
  --bg-surface-alt: #F3EFE8;
  --bg-surface-muted: #EBE5DB;

  --ink-primary: #0E1726;
  --ink-secondary: #334155;
  --ink-muted: #64748B;
  --ink-light: #94A3B8;

  --cobalt: #1D4ED8;
  --cobalt-dark: #1E40AF;
  --cobalt-light: #DBEAFE;

  --coral: #F43F5E;
  --coral-dark: #E11D48;
  --coral-light: #FFE4E6;

  --mustard: #F59E0B;
  --mustard-dark: #D97706;
  --mustard-light: #FEF3C7;

  --emerald: #10B981;
  --emerald-dark: #059669;
  --emerald-light: #D1FAE5;

  --border-color: #0E1726;
  --border-w-sm: 1.5px;
  --border-w: 2.5px;
  --border-w-thick: 3.5px;

  --radius-xs: 4px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-pill: 9999px;

  --shadow-sm: 2px 2px 0 var(--border-color);
  --shadow-md: 4px 4px 0 var(--border-color);
  --shadow-lg: 6px 6px 0 var(--border-color);
  --shadow-xl: 9px 9px 0 var(--border-color);

  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --max-w: 1280px;
  --header-h: 74px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-canvas);
  color: var(--ink-primary);
  line-height: 1.6;
  background-image: radial-gradient(var(--bg-surface-muted) 1.2px, transparent 1.2px);
  background-size: 24px 24px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* --- Accessibility & Focus Styles --- */
:focus-visible {
  outline: 3px solid var(--coral);
  outline-offset: 3px;
}

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

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

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

ul, ol {
  list-style: none;
}

/* --- Container Utilities --- */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

.container-narrow {
  width: 100%;
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

/* --- Common Neo-Brutalist Block Components --- */
.block-card {
  background-color: var(--bg-surface);
  border: var(--border-w) solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  padding: 24px;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
  position: relative;
}

.block-card:hover {
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-lg);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  font-size: 0.82rem;
  font-weight: 700;
  border-radius: var(--radius-pill);
  border: var(--border-w-sm) solid var(--border-color);
  box-shadow: 2px 2px 0 var(--border-color);
  line-height: 1.2;
}

.badge-cobalt { background-color: var(--cobalt-light); color: var(--cobalt-dark); }
.badge-coral { background-color: var(--coral-light); color: var(--coral-dark); }
.badge-mustard { background-color: var(--mustard-light); color: var(--mustard-dark); }
.badge-emerald { background-color: var(--emerald-light); color: var(--emerald-dark); }

/* --- Action Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  font-size: 1rem;
  font-weight: 800;
  border: var(--border-w) solid var(--border-color);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-md);
  cursor: pointer;
  transition: transform 0.1s ease, box-shadow 0.1s ease, background-color 0.15s ease;
  user-select: none;
  white-space: nowrap;
}

.btn:hover {
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-lg);
}

.btn:active {
  transform: translate(2px, 2px);
  box-shadow: var(--shadow-sm);
}

.btn-primary {
  background-color: var(--coral);
  color: #FFFFFF;
}
.btn-primary:hover {
  background-color: var(--coral-dark);
}

.btn-cobalt {
  background-color: var(--cobalt);
  color: #FFFFFF;
}
.btn-cobalt:hover {
  background-color: var(--cobalt-dark);
}

.btn-mustard {
  background-color: var(--mustard);
  color: var(--ink-primary);
}
.btn-mustard:hover {
  background-color: var(--mustard-dark);
}

.btn-secondary {
  background-color: var(--bg-surface);
  color: var(--ink-primary);
}
.btn-secondary:hover {
  background-color: var(--bg-surface-alt);
}

.btn-sm {
  padding: 7px 14px;
  font-size: 0.88rem;
  box-shadow: var(--shadow-sm);
}

.btn-lg {
  padding: 15px 32px;
  font-size: 1.15rem;
}

/* --- Site Header --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--bg-canvas);
  border-bottom: var(--border-w) solid var(--border-color);
  height: var(--header-h);
  display: flex;
  align-items: center;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 900;
  letter-spacing: -0.02em;
}

.logo-puzzle-icon {
  width: 38px;
  height: 38px;
  background: var(--bg-surface);
  border: var(--border-w) solid var(--border-color);
  border-radius: var(--radius-sm);
  box-shadow: 2px 2px 0 var(--border-color);
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr 1fr;
  padding: 4px;
  gap: 3px;
}

.logo-puzzle-icon span:nth-child(1) { background-color: var(--cobalt); border-radius: 2px; }
.logo-puzzle-icon span:nth-child(2) { background-color: var(--coral); border-radius: 2px; }
.logo-puzzle-icon span:nth-child(3) { background-color: var(--mustard); border-radius: 2px; }
.logo-puzzle-icon span:nth-child(4) { background-color: var(--ink-primary); border-radius: 2px; }

.nav-desktop {
  display: none;
}

@media (min-width: 1024px) {
  .nav-desktop {
    display: flex;
    align-items: center;
    gap: 20px;
  }
}

.nav-link {
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--ink-secondary);
  padding: 6px 10px;
  border-radius: var(--radius-xs);
  transition: color 0.15s ease, background-color 0.15s ease;
}

.nav-link:hover {
  color: var(--cobalt);
  background-color: var(--bg-surface-alt);
}

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

/* Hamburger button */
.hamburger-btn {
  display: flex;
  flex-direction: column;
  justify-content: space-around;
  width: 44px;
  height: 44px;
  background: var(--bg-surface);
  border: var(--border-w) solid var(--border-color);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
  padding: 9px;
  cursor: pointer;
}

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

.hamburger-line {
  width: 100%;
  height: 3px;
  background-color: var(--border-color);
  border-radius: 2px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.hamburger-btn[aria-expanded="true"] .hamburger-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.hamburger-btn[aria-expanded="true"] .hamburger-line:nth-child(2) {
  opacity: 0;
}
.hamburger-btn[aria-expanded="true"] .hamburger-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile Drawer */
.mobile-nav-drawer {
  position: fixed;
  top: var(--header-h);
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(14, 23, 38, 0.4);
  backdrop-filter: blur(2px);
  z-index: 999;
  display: none;
  opacity: 0;
  transition: opacity 0.2s ease;
}

.mobile-nav-drawer.is-active {
  display: block;
  opacity: 1;
}

.mobile-nav-panel {
  background-color: var(--bg-canvas);
  border-bottom: var(--border-w-thick) solid var(--border-color);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.15);
  padding: 24px 20px 32px;
  max-height: 85vh;
  overflow-y: auto;
}

.mobile-nav-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.mobile-nav-link {
  display: block;
  font-size: 1.1rem;
  font-weight: 800;
  padding: 12px 16px;
  background-color: var(--bg-surface);
  border: var(--border-w) solid var(--border-color);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
}

.mobile-nav-link:active {
  background-color: var(--mustard-light);
}

.mobile-cta-wrap {
  margin-top: 18px;
}

/* --- Section Formatting & Spacing --- */
.section {
  padding-top: 60px;
  padding-bottom: 60px;
  position: relative;
}

@media (min-width: 768px) {
  .section {
    padding-top: 80px;
    padding-bottom: 80px;
  }
}

.section-header {
  margin-bottom: 40px;
}

.section-tag {
  margin-bottom: 12px;
}

.section-title {
  font-size: 1.85rem;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--ink-primary);
  line-height: 1.25;
}

@media (min-width: 768px) {
  .section-title {
    font-size: 2.35rem;
  }
}

.section-desc {
  margin-top: 12px;
  font-size: 1.05rem;
  color: var(--ink-secondary);
  max-width: 760px;
}

/* --- Hero Section: Editorial Column + 9-Cell Puzzle Board --- */
.hero-section {
  padding-top: 40px;
  padding-bottom: 60px;
}

@media (min-width: 1024px) {
  .hero-section {
    padding-top: 60px;
    padding-bottom: 80px;
  }
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  align-items: center;
}

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

/* Editorial Column */
.hero-editorial {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

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

.hero-title {
  font-size: 2.3rem;
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -0.03em;
  color: var(--ink-primary);
}

@media (min-width: 640px) {
  .hero-title {
    font-size: 2.85rem;
  }
}

@media (min-width: 1200px) {
  .hero-title {
    font-size: 3.25rem;
  }
}

.hero-highlight-cobalt {
  color: var(--cobalt);
  position: relative;
  display: inline-block;
}

.hero-highlight-coral {
  color: var(--coral);
}

.hero-subtitle {
  font-size: 1.1rem;
  line-height: 1.7;
  color: var(--ink-secondary);
}

.hero-bullets {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  margin-top: 4px;
}

@media (min-width: 640px) {
  .hero-bullets {
    grid-template-columns: 1fr 1fr;
  }
}

.hero-bullet-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--ink-primary);
  background: var(--bg-surface);
  border: var(--border-w-sm) solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  box-shadow: 2px 2px 0 var(--border-color);
}

.bullet-icon {
  width: 12px;
  height: 12px;
  border-radius: 2px;
  flex-shrink: 0;
}

.bullet-icon-cobalt { background: var(--cobalt); }
.bullet-icon-coral { background: var(--coral); }
.bullet-icon-mustard { background: var(--mustard); }
.bullet-icon-emerald { background: var(--emerald); }

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
  margin-top: 8px;
}

.hero-meta-note {
  font-size: 0.85rem;
  color: var(--ink-muted);
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 4px;
}

/* 9-Cell Puzzle Board Module */
.hero-puzzle-box {
  background-color: var(--bg-surface);
  border: var(--border-w-thick) solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  padding: 16px 14px;
  position: relative;
  overflow: hidden;
}

@media (min-width: 480px) {
  .hero-puzzle-box {
    padding: 24px;
  }
}

.puzzle-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
  border-bottom: var(--border-w-sm) solid var(--border-color);
  padding-bottom: 12px;
}

.puzzle-title-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
}

.puzzle-title {
  font-size: 1.15rem;
  font-weight: 900;
}

.puzzle-status-pill {
  font-size: 0.78rem;
  font-weight: 700;
  padding: 3px 8px;
  background-color: var(--emerald-light);
  color: var(--emerald-dark);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-pill);
}

/* 3x3 Puzzle Grid */
.puzzle-board-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  gap: 8px;
  background-color: var(--bg-surface-alt);
  padding: 10px;
  border: var(--border-w) solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: inset 2px 2px 0 rgba(0,0,0,0.06);
  aspect-ratio: 1 / 1;
  width: 100%;
  max-width: 340px;
  margin: 0 auto;
}

@media (min-width: 480px) {
  .puzzle-board-grid {
    gap: 10px;
    padding: 14px;
  }
}

.puzzle-cell {
  background-color: var(--bg-surface);
  border: var(--border-w) dashed var(--border-color);
  border-radius: var(--radius-sm);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 1rem;
  cursor: pointer;
  user-select: none;
  transition: all 0.15s ease;
  position: relative;
}

.puzzle-cell:hover {
  background-color: var(--mustard-light);
  border-style: solid;
}

.puzzle-cell:focus-visible {
  outline: 3px solid var(--coral);
}

.puzzle-cell.is-filled {
  border-style: solid;
  color: #FFFFFF;
  box-shadow: var(--shadow-sm);
}

.puzzle-cell.cell-cobalt {
  background-color: var(--cobalt);
  color: #FFFFFF;
}

.puzzle-cell.cell-coral {
  background-color: var(--coral);
  color: #FFFFFF;
}

.puzzle-cell.cell-mustard {
  background-color: var(--mustard);
  color: var(--ink-primary);
}

.puzzle-cell.cell-preview {
  outline: 2px dashed var(--coral);
  outline-offset: -2px;
  background-color: rgba(244, 63, 94, 0.2);
}

.cell-coord {
  font-size: 0.65rem;
  opacity: 0.6;
  position: absolute;
  top: 3px;
  left: 5px;
}

.cell-label {
  font-size: 0.95rem;
  font-weight: 800;
}

/* Puzzle Piece Selection Dock */
.puzzle-dock {
  margin-top: 18px;
}

.dock-title {
  font-size: 0.85rem;
  font-weight: 800;
  color: var(--ink-secondary);
  margin-bottom: 8px;
  display: flex;
  justify-content: space-between;
}

.piece-tray {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.piece-btn {
  background-color: var(--bg-surface);
  border: var(--border-w) solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 8px 4px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: all 0.15s ease;
}

@media (min-width: 480px) {
  .piece-btn {
    padding: 10px;
  }
}

.piece-btn:hover {
  transform: translate(-1px, -1px);
  box-shadow: var(--shadow-md);
}

.piece-btn.is-active {
  border-color: var(--coral);
  background-color: var(--coral-light);
  box-shadow: var(--shadow-md);
}

.piece-btn.is-placed {
  opacity: 0.4;
  cursor: not-allowed;
  background-color: var(--bg-surface-muted);
}

.piece-mini-preview {
  display: grid;
  grid-template-columns: repeat(2, 12px);
  grid-template-rows: repeat(2, 12px);
  gap: 3px;
}

.mini-cube {
  width: 12px;
  height: 12px;
  border-radius: 2px;
  border: 1px solid var(--border-color);
}

.piece-name {
  font-size: 0.8rem;
  font-weight: 800;
}

/* Puzzle Controls Bar */
.puzzle-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.puzzle-controls .btn {
  flex: 1;
  min-width: 90px;
}

.puzzle-message-banner {
  margin-top: 12px;
  padding: 8px 12px;
  background-color: var(--emerald-light);
  border: var(--border-w-sm) solid var(--emerald-dark);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--emerald-dark);
  text-align: center;
  display: none;
}

.puzzle-disclaimer {
  margin-top: 14px;
  padding: 10px 12px;
  background-color: var(--bg-surface-alt);
  border-left: 3px solid var(--mustard-dark);
  font-size: 0.78rem;
  line-height: 1.45;
  color: var(--ink-muted);
}

/* --- Metrics / Highlights Strip --- */
.metrics-strip {
  border-top: var(--border-w) solid var(--border-color);
  border-bottom: var(--border-w) solid var(--border-color);
  background-color: var(--bg-surface);
  padding: 24px 0;
}

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

@media (min-width: 768px) {
  .metrics-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
  }
}

.metric-block {
  padding: 16px;
  border: var(--border-w) solid var(--border-color);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
  background-color: var(--bg-canvas);
  position: relative;
  overflow: hidden;
}

.metric-block::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 5px;
}

.metric-cobalt::before { background-color: var(--cobalt); }
.metric-coral::before { background-color: var(--coral); }
.metric-mustard::before { background-color: var(--mustard); }
.metric-emerald::before { background-color: var(--emerald); }

.metric-value {
  font-size: 1.85rem;
  font-weight: 900;
  font-family: var(--font-mono);
  color: var(--ink-primary);
  line-height: 1.1;
}

.metric-label {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--ink-secondary);
  margin-top: 4px;
}

/* --- Modular Rectangles Core Advantages (Deliberately Different Sizes) --- */
.advantages-modular-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

@media (min-width: 768px) {
  .advantages-modular-grid {
    grid-template-columns: 1.35fr 1fr;
    grid-template-rows: auto auto;
  }
}

/* Card 1: Massive Featured Card */
.adv-card-large {
  grid-row: span 2;
  background-color: var(--bg-surface);
  border: var(--border-w-thick) solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: 32px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.adv-visual-block {
  margin-top: 24px;
  background-color: var(--cobalt-light);
  border: var(--border-w) solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.adv-track-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: #FFFFFF;
  border: var(--border-w-sm) solid var(--border-color);
  border-radius: var(--radius-xs);
  padding: 8px 12px;
  font-size: 0.88rem;
  font-weight: 700;
}

/* Card 2 & 3: Medium Stacked Cards */
.adv-card-medium {
  background-color: var(--bg-surface);
  border: var(--border-w) solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  padding: 26px;
}

.adv-card-coral-tint {
  background-color: #FFF5F7;
}

.adv-card-mustard-tint {
  background-color: #FFFBF0;
}

/* Card 4: Full-width Wide Bottom Card */
.adv-card-wide {
  grid-column: 1 / -1;
  background-color: var(--bg-surface);
  border: var(--border-w) solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  padding: 28px 32px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  align-items: center;
}

@media (min-width: 768px) {
  .adv-card-wide {
    grid-template-columns: 1.2fr 1.8fr;
  }
}

.adv-client-logos {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.client-pill {
  padding: 6px 14px;
  font-size: 0.88rem;
  font-weight: 800;
  background-color: var(--bg-canvas);
  border: var(--border-w-sm) solid var(--border-color);
  border-radius: var(--radius-pill);
  box-shadow: 2px 2px 0 var(--border-color);
}

/* --- Full-Width Network Diagram --- */
.network-section {
  background-color: #F4EFE6;
  border-top: var(--border-w) solid var(--border-color);
  border-bottom: var(--border-w) solid var(--border-color);
}

.network-diagram-container {
  background-color: var(--bg-surface);
  border: var(--border-w-thick) solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: 28px 20px;
  overflow-x: auto;
}

@media (min-width: 768px) {
  .network-diagram-container {
    padding: 36px 32px;
  }
}

/* Topological Pipeline Layout */
.network-flow {
  display: flex;
  flex-direction: column;
  gap: 24px;
  min-width: 680px;
}

.flow-step-row {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 16px;
  align-items: center;
}

.flow-step-label {
  font-size: 0.95rem;
  font-weight: 900;
  padding: 10px 14px;
  background-color: var(--ink-primary);
  color: #FFFFFF;
  border-radius: var(--radius-sm);
  text-align: center;
  border: var(--border-w-sm) solid var(--border-color);
}

.flow-nodes-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}

.network-node-card {
  background-color: var(--bg-canvas);
  border: var(--border-w) solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 12px;
  box-shadow: var(--shadow-sm);
}

.node-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 6px;
}

.node-flag {
  font-size: 1.15rem;
}

.node-name {
  font-size: 0.95rem;
  font-weight: 800;
}

.node-ping {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--emerald-dark);
}

.node-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-top: 6px;
}

.node-tag-item {
  font-size: 0.7rem;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 3px;
  background-color: var(--bg-surface-muted);
}

.flow-connector-pipe {
  position: relative;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.flow-connector-pipe::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 140px;
  right: 0;
  height: 4px;
  background: repeating-linear-gradient(90deg, var(--border-color) 0, var(--border-color) 12px, transparent 12px, transparent 20px);
}

.pipe-label {
  position: relative;
  z-index: 2;
  font-size: 0.78rem;
  font-weight: 800;
  padding: 3px 10px;
  background-color: var(--mustard);
  border: var(--border-w-sm) solid var(--border-color);
  border-radius: var(--radius-pill);
}

/* Global Egress Grid */
.egress-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 10px;
}

/* --- Text-Led AI & Streaming Ecosystem Rows --- */
.ecosystem-container {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.ecosystem-category {
  background-color: var(--bg-surface);
  border: var(--border-w-thick) solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: 28px 24px;
}

@media (min-width: 768px) {
  .ecosystem-category {
    padding: 36px 32px;
  }
}

.category-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  border-bottom: var(--border-w) solid var(--border-color);
  padding-bottom: 16px;
}

.category-title {
  font-size: 1.45rem;
  font-weight: 900;
}

.eco-items-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

@media (min-width: 768px) {
  .eco-items-list {
    grid-template-columns: 1fr 1fr;
    gap: 20px;
  }
}

.eco-item-card {
  background-color: var(--bg-canvas);
  border: var(--border-w) solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 20px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform 0.15s ease;
}

.eco-item-card:hover {
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-md);
}

.eco-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}

.eco-app-name {
  font-size: 1.15rem;
  font-weight: 900;
}

.eco-desc {
  font-size: 0.92rem;
  color: var(--ink-secondary);
  line-height: 1.55;
  margin-bottom: 14px;
}

.eco-tech-specs {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.spec-chip {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 3px 8px;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 4px;
}

/* --- Clear Pricing Comparison --- */
.pricing-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  align-items: stretch;
}

@media (min-width: 768px) {
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1100px) {
  .pricing-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.price-card {
  background-color: var(--bg-surface);
  border: var(--border-w-thick) solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  padding: 28px 22px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

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

/* Visually Emphasized Option */
.price-card-featured {
  background-color: #FFFFFF;
  border-color: var(--border-color);
  border-width: var(--border-w-thick);
  box-shadow: var(--shadow-xl);
  transform: translateY(-6px);
  position: relative;
}

.price-card-featured::before {
  content: "⭐ 最受欢迎 / 强烈推荐";
  position: absolute;
  top: -16px;
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--coral);
  color: #FFFFFF;
  font-size: 0.78rem;
  font-weight: 900;
  padding: 4px 14px;
  border: var(--border-w-sm) solid var(--border-color);
  border-radius: var(--radius-pill);
  box-shadow: 2px 2px 0 var(--border-color);
  white-space: nowrap;
}

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

.price-tier-name {
  font-size: 1.25rem;
  font-weight: 900;
}

.price-tier-desc {
  font-size: 0.85rem;
  color: var(--ink-secondary);
  margin-top: 4px;
}

.price-amount-box {
  margin: 16px 0;
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.price-currency {
  font-size: 1.3rem;
  font-weight: 900;
}

.price-num {
  font-size: 2.5rem;
  font-weight: 900;
  font-family: var(--font-mono);
  line-height: 1;
}

.price-cycle {
  font-size: 0.88rem;
  color: var(--ink-muted);
  font-weight: 700;
}

.price-status-badge {
  display: inline-block;
  font-size: 0.74rem;
  font-weight: 700;
  color: var(--ink-muted);
  background-color: var(--bg-surface-alt);
  padding: 2px 8px;
  border-radius: 4px;
  border: 1px solid var(--border-color);
  margin-top: 4px;
}

.price-features-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 20px 0 28px;
  font-size: 0.9rem;
}

.price-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  line-height: 1.4;
}

.price-check-icon {
  color: var(--emerald-dark);
  font-weight: 900;
  font-size: 1rem;
  flex-shrink: 0;
}

.pricing-table-wrap {
  margin-top: 40px;
  overflow-x: auto;
  background-color: var(--bg-surface);
  border: var(--border-w) solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
}

.pricing-comparison-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.92rem;
  min-width: 640px;
}

.pricing-comparison-table th,
.pricing-comparison-table td {
  padding: 14px 18px;
  border-bottom: 1px solid #E2E8F0;
  border-right: 1px solid #E2E8F0;
}

.pricing-comparison-table th {
  background-color: var(--bg-canvas);
  font-weight: 800;
  color: var(--ink-primary);
  border-bottom: var(--border-w) solid var(--border-color);
}

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

.pricing-disclaimer {
  margin-top: 14px;
  font-size: 0.82rem;
  color: var(--ink-muted);
  background: var(--bg-surface-alt);
  border: 1px solid var(--border-color);
  padding: 10px 14px;
  border-radius: var(--radius-sm);
}

/* --- SEO Articles Grid (3x3 Desktop, 2 Tablet, 1 Mobile) --- */
.articles-section {
  background-color: var(--bg-canvas);
}

.articles-grid-3x3 {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

@media (min-width: 640px) {
  .articles-grid-3x3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .articles-grid-3x3 {
    grid-template-columns: repeat(3, 1fr);
  }
}

.article-card {
  background-color: var(--bg-surface);
  border: var(--border-w) solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.article-card:hover {
  transform: translate(-3px, -3px);
  box-shadow: var(--shadow-lg);
}

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

.article-category-tag {
  font-size: 0.75rem;
  font-weight: 800;
  padding: 3px 8px;
  border-radius: 4px;
  border: 1px solid var(--border-color);
}

.article-date-time {
  font-size: 0.78rem;
  color: var(--ink-muted);
}

.article-card-title {
  font-size: 1.15rem;
  font-weight: 900;
  line-height: 1.4;
  margin-bottom: 10px;
}

.article-card-title a:hover {
  color: var(--cobalt);
}

.article-card-excerpt {
  font-size: 0.88rem;
  color: var(--ink-secondary);
  line-height: 1.6;
  margin-bottom: 18px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-card-footer {
  border-top: 1px dashed var(--border-color);
  padding-top: 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.read-more-link {
  font-size: 0.88rem;
  font-weight: 800;
  color: var(--cobalt);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.read-more-link:hover {
  color: var(--coral);
}

/* --- Testimonials Section --- */
.testimonials-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

@media (min-width: 768px) {
  .testimonials-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.testimonial-card {
  background-color: var(--bg-surface);
  border: var(--border-w) solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.test-quote {
  font-size: 0.95rem;
  line-height: 1.65;
  color: var(--ink-primary);
  font-style: normal;
  margin-bottom: 16px;
  position: relative;
}

.test-author-box {
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px solid #E2E8F0;
  padding-top: 12px;
}

.test-avatar {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  border: var(--border-w-sm) solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  font-size: 1.1rem;
}

.avatar-cobalt { background-color: var(--cobalt-light); color: var(--cobalt-dark); }
.avatar-coral { background-color: var(--coral-light); color: var(--coral-dark); }
.avatar-mustard { background-color: var(--mustard-light); color: var(--mustard-dark); }
.avatar-emerald { background-color: var(--emerald-light); color: var(--emerald-dark); }

.test-name {
  font-size: 0.95rem;
  font-weight: 800;
}

.test-role {
  font-size: 0.8rem;
  color: var(--ink-muted);
}

.testimonials-disclaimer {
  margin-top: 24px;
  font-size: 0.82rem;
  color: var(--ink-muted);
  background-color: var(--bg-surface-alt);
  border: 1px solid var(--border-color);
  padding: 12px 16px;
  border-radius: var(--radius-sm);
}

/* --- Accordion FAQ Section --- */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
  max-width: 900px;
  margin: 0 auto;
}

.faq-item {
  background-color: var(--bg-surface);
  border: var(--border-w) solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: box-shadow 0.15s ease;
}

.faq-item[open] {
  box-shadow: var(--shadow-md);
}

.faq-question {
  padding: 18px 24px;
  font-size: 1.05rem;
  font-weight: 800;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
  list-style: none;
}

.faq-question::-webkit-details-marker {
  display: none;
}

.faq-indicator {
  width: 28px;
  height: 28px;
  background-color: var(--bg-canvas);
  border: var(--border-w-sm) solid var(--border-color);
  border-radius: var(--radius-xs);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  font-family: var(--font-mono);
  transition: transform 0.2s ease, background-color 0.2s ease;
  flex-shrink: 0;
}

.faq-item[open] .faq-indicator {
  transform: rotate(45deg);
  background-color: var(--coral-light);
  color: var(--coral-dark);
}

.faq-answer {
  padding: 0 24px 20px;
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--ink-secondary);
  border-top: 1px dashed #E2E8F0;
  margin-top: 4px;
  padding-top: 16px;
}

/* --- CTA Bottom Banner --- */
.cta-banner-section {
  background-color: var(--cobalt);
  color: #FFFFFF;
  border-top: var(--border-w-thick) solid var(--border-color);
  border-bottom: var(--border-w-thick) solid var(--border-color);
  padding: 60px 0;
  position: relative;
  overflow: hidden;
}

.cta-banner-card {
  background-color: var(--bg-canvas);
  color: var(--ink-primary);
  border: var(--border-w-thick) solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  padding: 40px 24px;
  text-align: center;
  max-width: 860px;
  margin: 0 auto;
}

@media (min-width: 768px) {
  .cta-banner-card {
    padding: 50px 48px;
  }
}

.cta-banner-title {
  font-size: 2rem;
  font-weight: 900;
  line-height: 1.25;
}

.cta-banner-desc {
  font-size: 1.05rem;
  color: var(--ink-secondary);
  margin: 16px auto 28px;
  max-width: 620px;
}

/* --- Site Footer --- */
.site-footer {
  background-color: var(--ink-primary);
  color: #F8FAFC;
  border-top: var(--border-w-thick) solid var(--border-color);
  padding-top: 60px;
  padding-bottom: 40px;
  margin-top: auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  margin-bottom: 40px;
}

@media (min-width: 768px) {
  .footer-grid {
    grid-template-columns: 1.5fr 1fr 1.2fr;
    gap: 48px;
  }
}

.footer-col-title {
  font-size: 1.1rem;
  font-weight: 900;
  color: #FFFFFF;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.footer-col-title::after {
  content: "";
  display: block;
  width: 24px;
  height: 3px;
  background-color: var(--coral);
}

.footer-desc {
  font-size: 0.9rem;
  color: #94A3B8;
  line-height: 1.65;
  margin-top: 12px;
}

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

.footer-link-item a {
  color: #CBD5E1;
  font-size: 0.92rem;
  transition: color 0.15s ease, padding-left 0.15s ease;
  display: inline-block;
}

.footer-link-item a:hover {
  color: var(--mustard);
  padding-left: 4px;
}

.recommendations-box {
  background-color: #1E293B;
  border: 1px solid #334155;
  border-radius: var(--radius-sm);
  padding: 16px;
}

.footer-bottom-bar {
  border-top: 1px solid #334155;
  padding-top: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  align-items: center;
  text-align: center;
  font-size: 0.85rem;
  color: #64748B;
}

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

/* --- Article Reading & Legal Page Styles --- */
.article-page-header {
  padding: 40px 0 20px;
  border-bottom: var(--border-w) solid var(--border-color);
  background-color: var(--bg-surface);
  margin-bottom: 36px;
}

.breadcrumbs {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--ink-muted);
  margin-bottom: 16px;
}

.breadcrumbs a {
  color: var(--ink-primary);
}

.breadcrumbs a:hover {
  color: var(--cobalt);
  text-decoration: underline;
}

.article-main-title {
  font-size: 2.1rem;
  font-weight: 900;
  line-height: 1.3;
  color: var(--ink-primary);
  margin-bottom: 16px;
}

@media (min-width: 768px) {
  .article-main-title {
    font-size: 2.5rem;
  }
}

.article-meta-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  font-size: 0.88rem;
  color: var(--ink-muted);
}

.article-body-content {
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--ink-secondary);
}

.article-body-content h2 {
  font-size: 1.6rem;
  font-weight: 900;
  color: var(--ink-primary);
  margin-top: 36px;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: var(--border-w) solid var(--border-color);
}

.article-body-content h3 {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--ink-primary);
  margin-top: 26px;
  margin-bottom: 12px;
}

.article-body-content p {
  margin-bottom: 18px;
}

.article-body-content ul,
.article-body-content ol {
  margin-bottom: 20px;
  padding-left: 24px;
}

.article-body-content ul {
  list-style-type: disc;
}

.article-body-content ol {
  list-style-type: decimal;
}

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

.article-callout {
  background-color: var(--bg-surface-alt);
  border-left: 5px solid var(--cobalt);
  border-top: var(--border-w-sm) solid var(--border-color);
  border-right: var(--border-w-sm) solid var(--border-color);
  border-bottom: var(--border-w-sm) solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 18px 20px;
  margin: 24px 0;
  font-size: 0.95rem;
}

.article-callout-warning {
  border-left-color: var(--coral);
  background-color: #FFF5F7;
}

.article-callout-mustard {
  border-left-color: var(--mustard);
  background-color: #FFFBF0;
}

.article-toc-box {
  background-color: var(--bg-surface);
  border: var(--border-w) solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  padding: 20px;
  margin-bottom: 32px;
}

.article-toc-title {
  font-weight: 900;
  font-size: 1.05rem;
  margin-bottom: 10px;
}

.article-toc-list {
  padding-left: 20px;
  list-style: decimal;
  font-size: 0.92rem;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.article-toc-list a {
  color: var(--cobalt);
  font-weight: 700;
}

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

.related-articles-box {
  margin-top: 48px;
  border-top: var(--border-w) solid var(--border-color);
  padding-top: 36px;
}

.related-articles-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 20px;
}

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

.related-card {
  background-color: var(--bg-surface);
  border: var(--border-w) solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 16px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.15s ease;
}

.related-card:hover {
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-md);
}

.related-title {
  font-size: 1rem;
  font-weight: 800;
  margin-bottom: 6px;
}

/* --- Reduced Motion Optimization --- */
@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;
  }
}