/* ==========================================================================
   一云梯机场 · 方案 B：云梯矩阵 · 星际网络控制中心
   Project: YYT-MATRIX-B02
   Design System: Matrix Console Theme (Deep Space / Ice Blue / Cyber Glass)
   ========================================================================== */

:root {
  --bg-primary: #050C19;
  --bg-secondary: #0B172A;
  --bg-panel: #102238;
  --bg-panel-hover: #152B46;
  --bg-glass: rgba(16, 34, 56, 0.75);
  
  --border-dark: #24405E;
  --border-light: rgba(98, 217, 255, 0.25);
  --border-active: #62D9FF;
  
  --text-primary: #F1F7FF;
  --text-secondary: #A6BED5;
  --text-muted: #6B87A2;
  
  --accent-cyan: #62D9FF;
  --accent-purple: #9C85FF;
  --accent-glow: rgba(98, 217, 255, 0.35);
  --accent-glow-purple: rgba(156, 133, 255, 0.25);
  
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-full: 9999px;
  
  --shadow-panel: 0 8px 32px 0 rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 20px rgba(98, 217, 255, 0.25);
  --shadow-glow-purple: 0 0 20px rgba(156, 133, 255, 0.2);
  
  --transition-fast: 0.18s ease;
  --transition-normal: 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: 84px;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  min-height: 100vh;
  background-color: var(--bg-primary);
  background-image: 
    radial-gradient(circle at 50% 0%, rgba(98, 217, 255, 0.08) 0%, transparent 60%),
    linear-gradient(rgba(36, 64, 94, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(36, 64, 94, 0.08) 1px, transparent 1px);
  background-size: 100% 100%, 48px 48px, 48px 48px;
  line-height: 1.6;
  overflow-x: hidden;
  display: flex;
  flex-direction: column;
}

/* Skip link for accessibility */
.skip-link {
  position: absolute;
  top: -60px;
  left: 20px;
  background: var(--accent-cyan);
  color: #050C19;
  padding: 10px 16px;
  font-weight: 700;
  z-index: 9999;
  transition: top 0.2s;
  border-radius: var(--radius-sm);
  text-decoration: none;
}
.skip-link:focus {
  top: 15px;
}

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

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

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

.container {
  width: 100%;
  max-width: 1320px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* Typography Utilities */
.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--accent-cyan);
  background: rgba(98, 217, 255, 0.08);
  border: 1px solid rgba(98, 217, 255, 0.3);
  padding: 4px 12px;
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
}

.section-tag::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-cyan);
  box-shadow: 0 0 8px var(--accent-cyan);
}

.section-title {
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.25;
  letter-spacing: -0.5px;
  margin-bottom: 14px;
}

.section-subtitle {
  font-size: clamp(0.95rem, 1.8vw, 1.125rem);
  color: var(--text-secondary);
  max-width: 680px;
  line-height: 1.65;
}

/* ==========================================================================
   Buttons & CTAs
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.9375rem;
  font-weight: 700;
  padding: 12px 24px;
  min-height: 46px;
  min-width: 44px;
  border-radius: var(--radius-sm);
  transition: all var(--transition-normal);
  text-decoration: none;
  letter-spacing: 0.5px;
}

.btn-primary {
  background: linear-gradient(135deg, #62D9FF 0%, #30A7DB 100%);
  color: #050C19;
  box-shadow: 0 0 16px rgba(98, 217, 255, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.4);
}

.btn-primary:hover, .btn-primary:focus-visible {
  background: linear-gradient(135deg, #81E2FF 0%, #45B6E8 100%);
  box-shadow: 0 0 24px rgba(98, 217, 255, 0.7), inset 0 1px 0 rgba(255, 255, 255, 0.6);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--bg-panel);
  color: var(--text-primary);
  border: 1px solid var(--border-dark);
}

.btn-secondary:hover, .btn-secondary:focus-visible {
  border-color: var(--accent-cyan);
  background: var(--bg-panel-hover);
  color: var(--accent-cyan);
  box-shadow: 0 0 14px rgba(98, 217, 255, 0.2);
  transform: translateY(-1px);
}

.btn-glow-purple {
  background: linear-gradient(135deg, #9C85FF 0%, #765AD9 100%);
  color: #FFFFFF;
  box-shadow: 0 0 16px rgba(156, 133, 255, 0.35);
}

.btn-glow-purple:hover {
  background: linear-gradient(135deg, #B19EFF 0%, #876BE0 100%);
  box-shadow: 0 0 24px rgba(156, 133, 255, 0.6);
  transform: translateY(-1px);
}

/* ==========================================================================
   Module 01: Top Network Control Navigation
   ========================================================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 72px;
  background: rgba(5, 12, 25, 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-dark);
  z-index: 1000;
  display: flex;
  align-items: center;
  transition: border-color var(--transition-fast);
}

.site-header::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent 0%, var(--accent-cyan) 50%, transparent 100%);
  opacity: 0.4;
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-logo img {
  height: 38px;
  width: auto;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-link {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
  padding: 8px 4px;
  position: relative;
}

.nav-link:hover, .nav-link:focus-visible {
  color: var(--accent-cyan);
}

.nav-link.active {
  color: var(--accent-cyan);
  font-weight: 600;
}

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--accent-cyan);
  box-shadow: 0 0 8px var(--accent-cyan);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.nav-cta-btn {
  padding: 8px 18px;
  font-size: 0.875rem;
}

/* Mobile Nav Toggle */
.mobile-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  background: var(--bg-panel);
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
}

.mobile-toggle span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--accent-cyan);
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

/* ==========================================================================
   Module 02: Holographic Ladder Hero Section (42% Left / 58% Right)
   ========================================================================== */
.hero-section {
  padding-top: 124px;
  padding-bottom: 50px;
  position: relative;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 42% 58%;
  align-items: center;
  gap: 32px;
  min-height: 580px;
}

.hero-content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  z-index: 2;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--accent-cyan);
  background: rgba(16, 34, 56, 0.9);
  border: 1px solid var(--border-dark);
  padding: 6px 14px;
  border-radius: var(--radius-full);
  margin-bottom: 20px;
}

.hero-badge .ping-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #3DDC84;
  box-shadow: 0 0 8px #3DDC84;
}

.hero-title {
  font-size: clamp(2.2rem, 4.2vw, 3.4rem);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -1px;
  margin-bottom: 18px;
}

.hero-title span {
  background: linear-gradient(135deg, #F1F7FF 30%, #62D9FF 70%, #9C85FF 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  font-size: 1.0625rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 30px;
  max-width: 480px;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}

.hero-security-note {
  font-size: 0.8125rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Hero Right: Holographic Ladder & 3 Orbiting Panels */
.hero-visual-matrix {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
  min-height: 520px;
}

.hero-ladder-frame {
  width: 100%;
  max-width: 620px;
  position: relative;
}

.hero-ladder-frame img {
  width: 100%;
  height: auto;
  filter: drop-shadow(0 0 25px rgba(98, 217, 255, 0.2));
}

/* 3 Orbiting Tech Telemetry Panels */
.holo-panel {
  position: absolute;
  background: rgba(16, 34, 56, 0.88);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  box-shadow: var(--shadow-panel);
  z-index: 3;
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.holo-panel:hover {
  border-color: var(--accent-cyan);
  transform: translateY(-2px);
}

.holo-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  border-bottom: 1px solid rgba(36, 64, 94, 0.5);
  padding-bottom: 6px;
  margin-bottom: 8px;
}

.holo-panel-header .code {
  color: var(--accent-cyan);
}

.holo-panel-content {
  font-size: 0.875rem;
  color: var(--text-primary);
  font-weight: 600;
}

.holo-panel-sub {
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* Positioning 3 Panels Around Ladder */
.panel-scenarios {
  top: 10%;
  left: 2%;
  width: 180px;
}

.panel-platforms {
  top: 36%;
  right: -2%;
  width: 190px;
}

.panel-devices {
  bottom: 8%;
  left: 8%;
  width: 210px;
}

/* Bottom Horizontal Console Bar */
.hero-console-bar {
  margin-top: 40px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-sm);
  padding: 14px 24px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.console-stat-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  border-right: 1px solid var(--border-dark);
  padding-right: 16px;
}

.console-stat-item:last-child {
  border-right: none;
  padding-right: 0;
}

.console-stat-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 1px;
}

.console-stat-value {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--accent-cyan);
  display: flex;
  align-items: center;
  gap: 6px;
}

.console-stat-desc {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

/* ==========================================================================
   Module 03: Network Usage Scenario Matrix (4 Asymmetric Panels)
   ========================================================================== */
.scenarios-section {
  padding: 80px 0;
  background: var(--bg-primary);
  position: relative;
}

.scenario-matrix-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  grid-template-rows: auto auto;
  gap: 24px;
  margin-top: 40px;
}

.scenario-panel {
  background: var(--bg-secondary);
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-md);
  padding: 32px;
  position: relative;
  overflow: hidden;
  transition: all var(--transition-normal);
}

.scenario-panel::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 0;
  background: var(--accent-cyan);
  transition: height var(--transition-normal);
}

.scenario-panel:hover {
  border-color: var(--accent-cyan);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.4), 0 0 16px rgba(98, 217, 255, 0.15);
  transform: translateY(-2px);
}

.scenario-panel:hover::before {
  height: 100%;
}

.scenario-panel.panel-large {
  grid-row: span 2;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.scenario-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.scenario-icon-wrap {
  width: 52px;
  height: 52px;
  background: var(--bg-panel);
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-cyan);
  font-size: 1.5rem;
}

.scenario-code {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.scenario-title {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.scenario-desc {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 20px;
}

.scenario-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}

.scenario-tag-item {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  background: var(--bg-panel);
  border: 1px solid var(--border-dark);
  color: var(--accent-cyan);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
}

.scenario-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--accent-cyan);
  transition: gap var(--transition-fast);
}

.scenario-link:hover {
  gap: 10px;
}

/* ==========================================================================
   Module 04: Platform Compatibility Center (Tabbed Console)
   ========================================================================== */
.platforms-section {
  padding: 80px 0;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-dark);
  border-bottom: 1px solid var(--border-dark);
}

.platform-console {
  background: var(--bg-panel);
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-md);
  margin-top: 36px;
  overflow: hidden;
}

.console-nav-tabs {
  display: flex;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-dark);
  overflow-x: auto;
}

.tab-btn {
  padding: 16px 28px;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-secondary);
  border-right: 1px solid var(--border-dark);
  display: flex;
  align-items: center;
  gap: 10px;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.tab-btn:hover {
  color: var(--text-primary);
  background: rgba(98, 217, 255, 0.05);
}

.tab-btn.active {
  color: var(--accent-cyan);
  background: var(--bg-panel);
  box-shadow: inset 0 2px 0 var(--accent-cyan);
}

.tab-content-pane {
  display: none;
  padding: 32px;
}

.tab-content-pane.active {
  display: block;
}

.platform-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}

.platform-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-sm);
  padding: 20px;
  display: flex;
  align-items: flex-start;
  gap: 16px;
  transition: border-color var(--transition-fast), transform var(--transition-fast);
}

.platform-card:hover {
  border-color: var(--accent-cyan);
  transform: translateY(-2px);
}

.platform-logo-img {
  width: 44px;
  height: 44px;
  flex-shrink: 0;
}

.platform-card-info h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.platform-card-info p {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 8px;
}

.platform-status-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: #3DDC84;
}

.platform-status-badge::before {
  content: "";
  display: inline-block;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: #3DDC84;
}

.platform-disclaimer {
  margin-top: 24px;
  font-size: 0.8125rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  line-height: 1.5;
  border-left: 2px solid var(--border-dark);
  padding-left: 12px;
}

/* ==========================================================================
   Module 05: Core Advantages Bento Grid (1 Large, 2 Medium, 3 Small)
   ========================================================================== */
.bento-section {
  padding: 80px 0;
}

.bento-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: auto auto;
  gap: 20px;
  margin-top: 40px;
}

.bento-item {
  background: var(--bg-panel);
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-md);
  padding: 28px;
  position: relative;
  overflow: hidden;
  transition: all var(--transition-normal);
}

.bento-item:hover {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 20px rgba(98, 217, 255, 0.12);
  transform: translateY(-2px);
}

/* 1 Large Main Module */
.bento-large {
  grid-column: span 2;
  grid-row: span 1;
  background: linear-gradient(135deg, rgba(16, 34, 56, 0.9) 0%, rgba(11, 23, 42, 0.9) 100%);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

/* 2 Medium Modules */
.bento-medium {
  grid-column: span 1;
}

/* 3 Small Modules */
.bento-small {
  grid-column: span 1;
}

.bento-code {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-cyan);
  margin-bottom: 12px;
  letter-spacing: 1px;
}

.bento-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 10px;
}

.bento-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.bento-highlight {
  font-family: var(--font-mono);
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--accent-cyan);
  margin-top: 16px;
}

/* ==========================================================================
   Module 06: Package Parameter Comparison Center (Horizontal Table)
   ========================================================================== */
.pricing-section {
  padding: 80px 0;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-dark);
  border-bottom: 1px solid var(--border-dark);
}

.table-scroller {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin-top: 36px;
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-md);
  background: var(--bg-panel);
}

.matrix-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  min-width: 860px;
}

.matrix-table th, .matrix-table td {
  padding: 18px 20px;
  border-bottom: 1px solid var(--border-dark);
}

.matrix-table th {
  background: #0B172A;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 1px;
  color: var(--text-secondary);
  font-weight: 600;
  position: sticky;
  top: 0;
}

.matrix-table tbody tr {
  transition: background-color var(--transition-fast);
}

.matrix-table tbody tr:hover {
  background-color: var(--bg-panel-hover);
}

.matrix-table tbody tr.row-recommended {
  background: rgba(98, 217, 255, 0.04);
}

.matrix-table tbody tr.row-recommended td:first-child {
  border-left: 3px solid var(--accent-cyan);
}

.package-name-cell {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.package-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
}

.package-badge-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--accent-cyan);
  background: rgba(98, 217, 255, 0.1);
  padding: 2px 6px;
  border-radius: 2px;
  width: fit-content;
}

.price-val {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--accent-cyan);
  font-family: var(--font-mono);
}

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

.feature-list-pill {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.table-cta-btn {
  padding: 8px 16px;
  font-size: 0.8125rem;
  white-space: nowrap;
}

.table-footer-notice {
  margin-top: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.8125rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* ==========================================================================
   Module 07: 3-Step Quick Start Console
   ========================================================================== */
.quickstart-section {
  padding: 80px 0;
}

.steps-console-container {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 28px;
  margin-top: 40px;
}

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

.step-nav-btn {
  background: var(--bg-secondary);
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-sm);
  padding: 20px;
  text-align: left;
  display: flex;
  align-items: center;
  gap: 16px;
  transition: all var(--transition-fast);
}

.step-nav-btn:hover {
  border-color: var(--accent-cyan);
  background: var(--bg-panel);
}

.step-nav-btn.active {
  border-color: var(--accent-cyan);
  background: var(--bg-panel);
  box-shadow: 0 0 16px rgba(98, 217, 255, 0.15);
}

.step-num {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-muted);
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: var(--bg-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-dark);
}

.step-nav-btn.active .step-num {
  color: var(--accent-cyan);
  border-color: var(--accent-cyan);
  background: rgba(98, 217, 255, 0.1);
}

.step-title-text {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--text-primary);
}

.step-sub-text {
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-top: 2px;
}

.step-display-pane {
  background: var(--bg-panel);
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-md);
  padding: 36px;
  position: relative;
}

.step-content-card {
  display: none;
}

.step-content-card.active {
  display: block;
}

.step-content-title {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.step-content-desc {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 24px;
}

.step-checklist {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 28px;
}

.step-checklist li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.step-checklist li::before {
  content: "✔";
  color: var(--accent-cyan);
  font-size: 0.875rem;
  font-weight: bold;
}

/* ==========================================================================
   Module 08: Multi-Device Workbench
   ========================================================================== */
.devices-section {
  padding: 80px 0;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-dark);
  border-bottom: 1px solid var(--border-dark);
}

.devices-visual-wrapper {
  margin-top: 40px;
  background: var(--bg-primary);
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-md);
  padding: 36px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.devices-visual-wrapper img {
  width: 100%;
  max-width: 960px;
  margin-left: auto;
  margin-right: auto;
  filter: drop-shadow(0 0 30px rgba(0, 0, 0, 0.6));
}

.devices-feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 28px;
  text-align: left;
}

.device-feat-card {
  background: var(--bg-panel);
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-sm);
  padding: 20px;
}

.device-feat-card h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--accent-cyan);
  margin-bottom: 6px;
}

.device-feat-card p {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* ==========================================================================
   Module 09: Real Guidance & Rational Selection
   ========================================================================== */
.guidance-section {
  padding: 80px 0;
}

.guidance-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 40px;
}

.guidance-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-md);
  padding: 32px;
}

.guidance-card-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
}

.guidance-icon {
  width: 40px;
  height: 40px;
  background: var(--bg-panel);
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-cyan);
  font-size: 1.25rem;
}

.guidance-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}

.guidance-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.guidance-list li {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
  border-left: 2px solid var(--border-dark);
  padding-left: 14px;
}

.guidance-list li strong {
  color: var(--text-primary);
  display: block;
  margin-bottom: 2px;
}

/* ==========================================================================
   Module 10: FAQ Network Diagnostic Center (Details/Summary)
   ========================================================================== */
.faq-section {
  padding: 80px 0;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-dark);
  border-bottom: 1px solid var(--border-dark);
}

.faq-container {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 32px;
  margin-top: 40px;
}

.faq-categories {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.faq-cat-btn {
  padding: 14px 18px;
  background: var(--bg-panel);
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--text-secondary);
  text-align: left;
  transition: all var(--transition-fast);
}

.faq-cat-btn:hover {
  color: var(--text-primary);
  border-color: var(--accent-cyan);
}

.faq-cat-btn.active {
  color: var(--accent-cyan);
  border-color: var(--accent-cyan);
  background: rgba(98, 217, 255, 0.08);
}

.faq-accordion-group {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-item {
  background: var(--bg-panel);
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-sm);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.faq-item:hover {
  border-color: rgba(98, 217, 255, 0.4);
}

.faq-summary {
  padding: 18px 24px;
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  list-style: none;
  user-select: none;
}

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

.faq-summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 1.25rem;
  color: var(--accent-cyan);
  transition: transform var(--transition-fast);
}

.faq-item[open] .faq-summary::after {
  content: "−";
  transform: rotate(180deg);
}

.faq-body {
  padding: 0 24px 20px 24px;
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.7;
  border-top: 1px solid rgba(36, 64, 94, 0.3);
  padding-top: 14px;
}

/* ==========================================================================
   Module 11: Earth Limb Terminal CTA
   ========================================================================== */
.terminal-cta-section {
  position: relative;
  padding: 120px 0 100px 0;
  background: #050C19;
  overflow: hidden;
  text-align: center;
}

.earth-backdrop {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  pointer-events: none;
}

.earth-backdrop img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center bottom;
}

.terminal-cta-content {
  position: relative;
  z-index: 2;
  max-width: 760px;
  margin-left: auto;
  margin-right: auto;
}

.terminal-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--accent-cyan);
  background: rgba(16, 34, 56, 0.8);
  border: 1px solid var(--border-dark);
  padding: 6px 16px;
  border-radius: var(--radius-full);
  margin-bottom: 20px;
}

.terminal-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.25;
  margin-bottom: 16px;
}

.terminal-desc {
  font-size: 1.0625rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 36px;
}

.terminal-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  flex-wrap: wrap;
}

/* ==========================================================================
   Module 12: Terminal Footer
   ========================================================================== */
.site-footer {
  background: #02060D;
  border-top: 1px solid var(--border-dark);
  padding: 48px 0 32px 0;
}

.footer-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 24px;
  padding-bottom: 32px;
  border-bottom: 1px solid rgba(36, 64, 94, 0.4);
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.footer-brand img {
  height: 32px;
  width: auto;
}

/* The 4 Main Mandatory Links */
.footer-four-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.footer-four-link a {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.footer-four-link a:hover {
  color: var(--accent-cyan);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  padding-top: 24px;
  font-size: 0.8125rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* ==========================================================================
   Article & Knowledge Layouts (Clean High Readability)
   ========================================================================== */
.article-header-hero {
  padding: 130px 0 40px 0;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-dark);
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}

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

.breadcrumb a:hover {
  color: var(--accent-cyan);
}

.article-title {
  font-size: clamp(1.8rem, 3.2vw, 2.5rem);
  font-weight: 800;
  line-height: 1.3;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 20px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--accent-cyan);
}

.article-body-wrapper {
  padding: 60px 0;
}

.article-content {
  max-width: 820px;
  margin-left: auto;
  margin-right: auto;
  font-size: 1.0625rem;
  line-height: 1.85;
  color: var(--text-secondary);
}

.article-content h2 {
  font-size: 1.625rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 40px 0 16px 0;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-dark);
}

.article-content h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--accent-cyan);
  margin: 28px 0 12px 0;
}

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

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

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

.article-content a {
  color: var(--accent-cyan);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.article-callout {
  background: var(--bg-panel);
  border-left: 4px solid var(--accent-cyan);
  padding: 20px 24px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 28px 0;
  font-size: 0.9375rem;
}

.article-faq-section {
  margin-top: 48px;
  border-top: 1px solid var(--border-dark);
  padding-top: 32px;
}

/* ==========================================================================
   Responsive Adaptations (360px, 375px, 390px, 768px, 1024px, 1440px)
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  
  .hero-visual-matrix {
    order: -1;
    min-height: 440px;
  }
  
  .panel-scenarios {
    left: 0;
    top: 5%;
  }
  
  .panel-platforms {
    right: 0;
    top: 30%;
  }
  
  .panel-devices {
    left: 4%;
    bottom: 2%;
  }

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

  .bento-large {
    grid-column: span 2;
  }

  .steps-console-container {
    grid-template-columns: 1fr;
  }

  .faq-container {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .holo-panel {
    display: none !important;
  }

  .hero-visual-matrix {
    min-height: 380px;
    padding: 0 10px;
  }

  .mobile-toggle {
    display: flex;
  }

  .nav-links {
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: #050C19;
    border-bottom: 1px solid var(--border-dark);
    flex-direction: column;
    align-items: flex-start;
    padding: 24px;
    gap: 16px;
    display: none;
  }

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

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

  .console-stat-item:nth-child(2) {
    border-right: none;
  }

  .scenario-matrix-grid {
    grid-template-columns: 1fr;
  }

  .scenario-panel.panel-large {
    grid-row: span 1;
  }

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

  .bento-large {
    grid-column: span 1;
  }

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

  .devices-feature-grid {
    grid-template-columns: 1fr;
  }

  .footer-top {
    flex-direction: column;
    align-items: flex-start;
  }

  .footer-four-links {
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
  }
}

@media (max-width: 480px) {
  .hero-console-bar {
    grid-template-columns: 1fr;
  }

  .console-stat-item {
    border-right: none;
    border-bottom: 1px solid var(--border-dark);
    padding-bottom: 10px;
  }

  .console-stat-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
  }

  .holo-panel {
    display: none; /* Keep holographic ladder focal point clean on small mobile */
  }

  .hero-actions {
    flex-direction: column;
    width: 100%;
  }

  .hero-actions .btn {
    width: 100%;
  }
}

/* Reduced motion support */
@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;
  }
}


/* ==========================================================================
   User Feedback & Community Telemetry Panels (Module 09)
   ========================================================================== */
.feedback-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 36px;
  margin-bottom: 36px;
}

.feedback-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-md);
  padding: 24px;
  position: relative;
  transition: all var(--transition-normal);
}

.feedback-card:hover {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 20px rgba(98, 217, 255, 0.12);
  transform: translateY(-2px);
}

.feedback-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
  border-bottom: 1px solid rgba(36, 64, 94, 0.4);
  padding-bottom: 10px;
}

.feedback-user-id {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--accent-cyan);
  font-weight: 700;
}

.feedback-user-env {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.feedback-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  background: rgba(98, 217, 255, 0.08);
  border: 1px solid rgba(98, 217, 255, 0.25);
  color: var(--accent-cyan);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
}

.feedback-quote {
  font-size: 0.9375rem;
  color: var(--text-primary);
  line-height: 1.65;
  margin-bottom: 16px;
}

.feedback-telemetry-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: #3DDC84;
  background: var(--bg-panel);
  border: 1px solid var(--border-dark);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
}

.feedback-telemetry-bar span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.feedback-telemetry-bar span::before {
  content: "";
  display: inline-block;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: #3DDC84;
}

@media (max-width: 768px) {
  .feedback-grid {
    grid-template-columns: 1fr;
  }
}