/* ==========================================================================
   良心云VPN - 企业级全球物理专线加速基础设施
   主题配色：奢华流金、曜石深海黑、纯净白 (#d97706, #f59e0b, #fbbf24, #07172B, #ffffff)
   3D 灵动元素、非对称复合布局、金色分布式网状拓扑与微交互引擎
   ========================================================================== */

:root {
  --primary: #d97706;
  --primary-hover: #b45309;
  --primary-light: #fef3c7;
  --gold: #f59e0b;
  --gold-hover: #d97706;
  --gold-light: #fffbeb;
  --gold-bright: #fbbf24;
  --gold-champagne: #fef08a;
  --gold-border: rgba(245, 158, 11, 0.3);
  --gold-glow: rgba(245, 158, 11, 0.35);
  --cyan: #f59e0b;
  --cyan-hover: #d97706;
  --cyan-light: #fef3c7;
  --accent-blue: #b45309;
  --navy-dark: #07172b;
  --navy-darker: #040c17;
  --navy-card: #0d1e34;
  --navy-border: rgba(245, 158, 11, 0.25);
  --text-main: #0f172a;
  --text-muted: #475569;
  --text-light: #94a3b8;
  --bg-page: #faf8f5;
  --bg-card: #ffffff;
  --border-light: rgba(226, 232, 240, 0.9);
  --glass-bg: rgba(255, 255, 255, 0.9);
  --glass-border: rgba(255, 255, 255, 0.95);
  --glass-shadow: 0 20px 45px rgba(217, 119, 6, 0.08), 0 4px 12px rgba(15, 23, 42, 0.04);
  --shadow-3d: 0 20px 40px -10px rgba(217, 119, 6, 0.18), 0 8px 16px -4px rgba(0, 0, 0, 0.04);
  --shadow-3d-hover: 0 28px 56px -12px rgba(217, 119, 6, 0.32), 0 16px 28px -6px rgba(245, 158, 11, 0.22);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-xl: 30px;
  --transition: all 0.32s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text-main);
  background-color: var(--bg-page);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

body {
  overflow-x: hidden;
  min-height: 100vh;
}

a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition);
}

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

ul, ol {
  list-style: none;
}

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

/* Layout Containers */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}

.container-narrow {
  max-width: 960px;
}

.section {
  padding: 96px 0;
  position: relative;
}

.section-title-wrap {
  text-align: center;
  max-width: 780px;
  margin: 0 auto 60px;
  position: relative;
  z-index: 2;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 18px;
  border-radius: 9999px;
  background: var(--gold-light);
  color: var(--primary);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.5px;
  margin-bottom: 14px;
  border: 1px solid rgba(217, 119, 6, 0.25);
  box-shadow: 0 4px 12px rgba(217, 119, 6, 0.1);
}

.section-tag.cyan {
  background: #fef3c7;
  color: #b45309;
  border-color: rgba(245, 158, 11, 0.35);
  box-shadow: 0 4px 12px rgba(245, 158, 11, 0.12);
}

.section-tag.dark {
  background: rgba(245, 158, 11, 0.18);
  color: #fbbf24;
  border-color: rgba(251, 191, 36, 0.35);
  box-shadow: 0 4px 14px rgba(245, 158, 11, 0.2);
}

.section-title {
  font-size: 40px;
  font-weight: 900;
  letter-spacing: -0.8px;
  color: var(--text-main);
  line-height: 1.25;
  margin-bottom: 16px;
}

.section-subtitle {
  font-size: 17px;
  color: var(--text-muted);
  line-height: 1.65;
}

/* ==========================================================================
   3D Dynamic Floating & Perspective Elements
   ========================================================================== */
.perspective-container {
  perspective: 1200px;
}

.card-3d-tilt {
  transform-style: preserve-3d;
  transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.35s ease, border-color 0.35s ease;
}

.card-3d-tilt:hover {
  transform: translateY(-8px) rotateX(2deg) rotateY(-1.5deg);
  box-shadow: var(--shadow-3d-hover);
}

@keyframes float3D {
  0% { transform: translateY(0px) rotate(0deg); }
  50% { transform: translateY(-10px) rotate(1.2deg); }
  100% { transform: translateY(0px) rotate(0deg); }
}

@keyframes float3DAlt {
  0% { transform: translateY(0px) rotate(0deg); }
  50% { transform: translateY(8px) rotate(-1.5deg); }
  100% { transform: translateY(0px) rotate(0deg); }
}

/* Floating 3D Micro-Badges */
.floating-3d-chip {
  position: absolute;
  padding: 8px 18px;
  border-radius: 9999px;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(14px);
  border: 1px solid rgba(251, 191, 36, 0.4);
  box-shadow: 0 12px 30px rgba(217, 119, 6, 0.18), 0 4px 8px rgba(0, 0, 0, 0.04);
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 800;
  color: #78350f;
  z-index: 10;
  animation: float3D 5s infinite ease-in-out;
}

.floating-3d-chip.chip-1 {
  top: -16px;
  right: 28px;
  animation-delay: 0.5s;
}

.floating-3d-chip.chip-2 {
  bottom: -18px;
  left: 20px;
  animation: float3DAlt 6s infinite ease-in-out;
  animation-delay: 1.2s;
}

/* 3D Rendered Vector Illustration Containers */
.icon-3d-box {
  width: 72px;
  height: 72px;
  border-radius: 20px;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.95) 0%, rgba(254, 243, 199, 0.85) 100%);
  border: 1px solid rgba(245, 158, 11, 0.3);
  box-shadow: 0 12px 28px rgba(217, 119, 6, 0.14), inset 0 2px 4px rgba(255, 255, 255, 0.9);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 22px;
  position: relative;
  transition: var(--transition);
  flex-shrink: 0;
}

.icon-3d-box svg {
  width: 44px;
  height: 44px;
  filter: drop-shadow(0 6px 14px rgba(217, 119, 6, 0.28));
  transition: transform 0.35s ease;
}

.card-3d-tilt:hover .icon-3d-box {
  transform: translateY(-4px) scale(1.06);
  box-shadow: 0 16px 36px rgba(217, 119, 6, 0.25), 0 0 20px rgba(245, 158, 11, 0.35);
}

.card-3d-tilt:hover .icon-3d-box svg {
  transform: scale(1.1) rotate(-3deg);
}

/* Buttons */
.btn-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 30px;
  border-radius: var(--radius-md);
  font-weight: 800;
  font-size: 15px;
  letter-spacing: 0.2px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  cursor: pointer;
  box-shadow: 0 6px 20px rgba(217, 119, 6, 0.32);
}

.btn-primary {
  background: linear-gradient(135deg, #d97706 0%, #f59e0b 50%, #fbbf24 100%);
  color: #ffffff;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #b45309 0%, #d97706 50%, #f59e0b 100%);
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(217, 119, 6, 0.45);
}

.btn-primary::after {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 50%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
  transform: skewX(-20deg);
  animation: shine 4s infinite;
}

@keyframes shine {
  0% { left: -100%; }
  25% { left: 200%; }
  100% { left: 200%; }
}

.btn-secondary {
  background: #ffffff;
  color: var(--primary);
  border: 1px solid rgba(217, 119, 6, 0.35);
  box-shadow: 0 4px 14px rgba(15, 23, 42, 0.05);
}

.btn-secondary:hover {
  background: var(--gold-light);
  border-color: var(--primary);
  transform: translateY(-2px);
}

.btn-sm {
  padding: 10px 20px;
  font-size: 13.5px;
  border-radius: var(--radius-sm);
}

.btn-lg {
  padding: 16px 36px;
  font-size: 16.5px;
  border-radius: var(--radius-lg);
}

/* Header & Nav */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(226, 232, 240, 0.85);
  transition: var(--transition);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 900;
  font-size: 21px;
  color: var(--text-main);
}

.brand-icon-3d {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: linear-gradient(135deg, #d97706, #fbbf24);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 6px 18px rgba(217, 119, 6, 0.4);
  color: #fff;
}

.brand-name {
  letter-spacing: -0.4px;
}

.brand-tag {
  font-size: 11px;
  font-weight: 800;
  padding: 2px 8px;
  border-radius: 6px;
  background: var(--gold-light);
  color: var(--primary);
  border: 1px solid rgba(245, 158, 11, 0.25);
  margin-left: 6px;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-link {
  font-size: 14.5px;
  font-weight: 700;
  color: var(--text-muted);
  position: relative;
  padding: 6px 0;
}

.nav-link:hover, .nav-link.active {
  color: var(--primary);
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background: var(--primary);
  border-radius: 2px;
  transition: width 0.25s ease;
}

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

.header-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

.mobile-menu-btn {
  display: none;
  font-size: 24px;
  color: var(--text-main);
}

/* ==========================================================================
   Hero Section: Split Hero Canvas (6:4 Asymmetric)
   保留金秋原色底图，晶莹通透金色拟态
   ========================================================================== */
.hero-section {
  position: relative;
  min-height: 88vh;
  padding: 88px 0 110px;
  display: flex;
  align-items: center;
  background-image: url('../images/hero-bg.webp');
  background-size: cover;
  background-position: center center;
  background-repeat: no-repeat;
  overflow: hidden;
}

.hero-backdrop-clear {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.45) 0%, rgba(254, 252, 232, 0.28) 50%, rgba(255, 255, 255, 0.5) 100%);
  pointer-events: none;
}

.hero-grid {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 44px;
  align-items: center;
}

.hero-narrative-card {
  background: var(--glass-bg);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  padding: 48px;
  box-shadow: 0 28px 68px rgba(120, 53, 15, 0.12), 0 4px 12px rgba(0, 0, 0, 0.04);
}

.hero-pain-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #ffffff;
  padding: 6px 16px;
  border-radius: 9999px;
  font-size: 13px;
  font-weight: 800;
  color: #92400e;
  border: 1px solid rgba(245, 158, 11, 0.35);
  margin-bottom: 22px;
  box-shadow: 0 4px 14px rgba(245, 158, 11, 0.15);
}

.status-dot-pulse {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: #f59e0b;
  position: relative;
}

.status-dot-pulse::after {
  content: "";
  position: absolute;
  inset: -3px;
  border-radius: 50%;
  background: #f59e0b;
  opacity: 0.6;
  animation: pulse-ring 2s infinite ease-out;
}

@keyframes pulse-ring {
  0% { transform: scale(1); opacity: 0.8; }
  100% { transform: scale(2.2); opacity: 0; }
}

.hero-title {
  font-size: 46px;
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -1px;
  color: #1e293b;
  margin-bottom: 22px;
}

.hero-title .text-gradient {
  background: linear-gradient(135deg, #b45309 0%, #d97706 45%, #f59e0b 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  font-size: 16.5px;
  line-height: 1.75;
  color: #334155;
  margin-bottom: 34px;
}

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

.hero-trust-indicators {
  display: flex;
  align-items: center;
  gap: 24px;
  padding-top: 24px;
  border-top: 1px solid rgba(245, 158, 11, 0.2);
  flex-wrap: wrap;
}

.indicator-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13.5px;
  font-weight: 800;
  color: #1e293b;
}

.indicator-item svg {
  width: 18px;
  height: 18px;
  color: var(--primary);
}

/* Right Hero Canvas: Floating Glassmorphic Telemetry Board */
.hero-telemetry-panel {
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(26px);
  -webkit-backdrop-filter: blur(26px);
  border: 1px solid rgba(255, 255, 255, 0.95);
  border-radius: var(--radius-xl);
  padding: 36px;
  box-shadow: 0 32px 72px rgba(120, 53, 15, 0.16), 0 6px 18px rgba(0, 0, 0, 0.04);
  position: relative;
}

.telemetry-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 18px;
  border-bottom: 1px solid #e2e8f0;
  margin-bottom: 22px;
}

.telemetry-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 15px;
  font-weight: 800;
  color: #0f172a;
}

.telemetry-live-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  background: rgba(245, 158, 11, 0.14);
  color: #b45309;
  border-radius: 9999px;
  font-size: 12px;
  font-weight: 800;
  border: 1px solid rgba(245, 158, 11, 0.3);
}

.telemetry-stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-bottom: 24px;
}

.telemetry-stat-card {
  background: #fdfcf9;
  border: 1px solid #f1ece4;
  border-radius: var(--radius-md);
  padding: 16px;
  transition: var(--transition);
}

.telemetry-stat-card:hover {
  background: #ffffff;
  border-color: var(--primary);
  box-shadow: 0 8px 20px rgba(217, 119, 6, 0.12);
}

.stat-label {
  font-size: 12px;
  color: #64748b;
  margin-bottom: 4px;
  font-weight: 600;
}

.stat-value {
  font-size: 24px;
  font-weight: 900;
  color: #0f172a;
  letter-spacing: -0.5px;
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.stat-value.primary { color: var(--primary); }
.stat-value.cyan { color: #d97706; }
.stat-value.green { color: #b45309; }

.stat-unit {
  font-size: 12px;
  color: #64748b;
  font-weight: 600;
}

/* Real-time Latency Jitter Graph */
.telemetry-graph-card {
  background: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: var(--radius-md);
  padding: 18px;
  margin-bottom: 20px;
}

.graph-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
  font-size: 12.5px;
  font-weight: 700;
  color: #334155;
}

.latency-bars {
  display: flex;
  align-items: flex-end;
  gap: 6px;
  height: 60px;
  padding-top: 8px;
}

.latency-bar {
  flex: 1;
  background: linear-gradient(180deg, #fbbf24 0%, #d97706 100%);
  border-radius: 4px 4px 0 0;
  transition: height 0.4s ease;
  min-height: 14px;
}

.telemetry-route-pill {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: #fefce8;
  border: 1px solid rgba(245, 158, 11, 0.35);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  font-size: 13px;
  color: #78350f;
  font-weight: 800;
}

.route-meta {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* ==========================================================================
   Static Global Application Native Unlocking Badges
   ========================================================================== */
.ecosystem-section {
  padding: 38px 0;
  background: #ffffff;
  border-top: 1px solid #e2e8f0;
  border-bottom: 1px solid #e2e8f0;
}

.ecosystem-header {
  text-align: center;
  font-size: 13px;
  font-weight: 800;
  color: #64748b;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  margin-bottom: 24px;
}

.ecosystem-grid {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 16px;
}

.ecosystem-badge {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 18px;
  background: #fdfcf9;
  border: 1px solid #f1ece4;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 700;
  color: #1e293b;
  transition: var(--transition);
}

.ecosystem-badge:hover {
  background: #ffffff;
  border-color: var(--primary);
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(217, 119, 6, 0.15);
}

.ecosystem-icon-3d {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.08);
}

.ecosystem-icon-3d svg {
  width: 18px;
  height: 18px;
}

.badge-tag-speed {
  font-size: 11px;
  padding: 2px 7px;
  border-radius: 4px;
  background: rgba(245, 158, 11, 0.14);
  color: #b45309;
  font-weight: 800;
}

/* ==========================================================================
   非对称多布局 (Asymmetric Multi-Layout Matrix)
   ========================================================================== */
.asym-matrix-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 24px;
}

.asym-card {
  background: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: var(--radius-xl);
  padding: 34px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  overflow: hidden;
  transition: var(--transition);
}

.asym-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, #d97706, #fbbf24);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.asym-card:hover::before {
  opacity: 1;
}

.asym-card.col-span-7 {
  grid-column: span 7;
  background: linear-gradient(135deg, #ffffff 0%, #fffbeb 100%);
  border: 1px solid #fde68a;
}

.asym-card.col-span-5 { grid-column: span 5; }
.asym-card.col-span-4 { grid-column: span 4; }
.asym-card.col-span-4-mid { grid-column: span 4; }
.asym-card.col-span-4-right { grid-column: span 4; }
.asym-card.col-span-12 {
  grid-column: span 12;
  background: linear-gradient(135deg, #ffffff 0%, #faf8f5 100%);
}

.card-top-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 20px;
}

.card-pill-tag {
  font-size: 12px;
  font-weight: 800;
  padding: 4px 10px;
  border-radius: 9999px;
  background: var(--gold-light);
  color: var(--primary);
  border: 1px solid rgba(245, 158, 11, 0.25);
}

.card-pill-tag.green {
  background: #fefce8;
  color: #854d0e;
  border-color: rgba(245, 158, 11, 0.35);
}

.card-pill-tag.cyan {
  background: #fef3c7;
  color: #b45309;
  border-color: rgba(245, 158, 11, 0.35);
}

.asym-title {
  font-size: 22px;
  font-weight: 800;
  color: #0f172a;
  margin-bottom: 10px;
  line-height: 1.35;
}

.asym-desc {
  font-size: 14.5px;
  color: #475569;
  line-height: 1.65;
  margin-bottom: 22px;
}

.asym-interactive-preview {
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px solid rgba(226, 232, 240, 0.85);
}

.mini-meta-flex {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.mini-meta-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12.5px;
  font-weight: 700;
  color: #1e293b;
}

.mini-meta-item svg {
  width: 14px;
  height: 14px;
  color: var(--primary);
}

.platform-devices-row {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
  margin-top: 24px;
}

.platform-device-box {
  background: #ffffff;
  border: 1px solid #f1ece4;
  border-radius: var(--radius-md);
  padding: 16px 14px;
  text-align: center;
  transition: var(--transition);
}

.platform-device-box:hover {
  border-color: var(--primary);
  transform: translateY(-4px);
  box-shadow: 0 8px 20px rgba(217, 119, 6, 0.15);
}

.device-icon-wrap {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  margin: 0 auto 10px;
  background: var(--gold-light);
  display: flex;
  align-items: center;
  justify-content: center;
}

.device-icon-wrap svg {
  width: 24px;
  height: 24px;
  color: var(--primary);
}

.device-name {
  font-size: 14px;
  font-weight: 700;
  color: #0f172a;
  margin-bottom: 2px;
}

.device-sub {
  font-size: 11.5px;
  color: #64748b;
  font-weight: 500;
}

/* ==========================================================================
   F-Pattern Visual Narrative Section (F型视觉流线布局 - 黑金尊享版)
   ========================================================================== */
.f-pattern-section {
  background: #ffffff;
  padding: 96px 0;
  position: relative;
}

.f-top-banner {
  background: linear-gradient(135deg, #1e293b 0%, #0f172a 45%, #78350f 100%);
  border-radius: var(--radius-xl);
  padding: 34px 44px;
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 48px;
  border: 1px solid rgba(245, 158, 11, 0.35);
  box-shadow: 0 16px 45px rgba(120, 53, 15, 0.22);
  flex-wrap: wrap;
  gap: 20px;
}

.f-banner-title {
  font-size: 24px;
  font-weight: 900;
  line-height: 1.3;
}

.f-banner-sub {
  font-size: 14.5px;
  color: #fde68a;
  margin-top: 4px;
}

.f-banner-stats {
  display: flex;
  align-items: center;
  gap: 32px;
}

.f-stat-unit {
  text-align: right;
}

.f-stat-val {
  font-size: 28px;
  font-weight: 900;
  letter-spacing: -0.5px;
  color: #fbbf24;
}

.f-stat-lbl {
  font-size: 12px;
  color: #fef3c7;
  font-weight: 600;
}

.f-main-grid {
  display: grid;
  grid-template-columns: 0.95fr 1.05fr;
  gap: 40px;
  align-items: start;
}

.f-vertical-spine {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.spine-checkpoint {
  background: #fdfcf9;
  border: 1px solid #f1ece4;
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  align-items: flex-start;
  gap: 18px;
  transition: var(--transition);
  cursor: pointer;
}

.spine-checkpoint:hover, .spine-checkpoint.active {
  background: #ffffff;
  border-color: var(--primary);
  box-shadow: 0 12px 28px rgba(217, 119, 6, 0.15);
  transform: translateX(6px);
}

.spine-num-badge {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: var(--gold-light);
  color: var(--primary);
  font-size: 16px;
  font-weight: 900;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.spine-checkpoint.active .spine-num-badge {
  background: linear-gradient(135deg, #d97706, #fbbf24);
  color: #ffffff;
}

.spine-title {
  font-size: 17px;
  font-weight: 800;
  color: #0f172a;
  margin-bottom: 6px;
}

.spine-desc {
  font-size: 13.5px;
  color: #475569;
  line-height: 1.6;
}

.f-diagnostic-canvas {
  background: #ffffff;
  border: 1px solid #fde68a;
  border-radius: var(--radius-xl);
  padding: 36px;
  box-shadow: 0 20px 48px rgba(120, 53, 15, 0.08);
  position: sticky;
  top: 96px;
}

.diagnostic-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 20px;
  border-bottom: 1px solid #f1ece4;
  margin-bottom: 24px;
}

.diagnostic-title {
  font-size: 18px;
  font-weight: 800;
  color: #0f172a;
}

.diagnostic-flow-box {
  background: #fdfcf9;
  border: 1px solid #f1ece4;
  border-radius: var(--radius-md);
  padding: 20px;
  margin-bottom: 20px;
}

.flow-step-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: relative;
  margin-bottom: 16px;
}

.flow-node-badge {
  padding: 10px 16px;
  border-radius: 10px;
  background: #ffffff;
  border: 1px solid #e2e8f0;
  font-size: 13px;
  font-weight: 700;
  color: #0f172a;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.04);
}

.flow-arrow-wire {
  flex-grow: 1;
  height: 2px;
  background: linear-gradient(90deg, #d97706, #fbbf24);
  margin: 0 12px;
  position: relative;
}

.flow-arrow-wire::after {
  content: "";
  position: absolute;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #fbbf24;
  top: -3px;
  left: 0;
  animation: movePhoton 2s infinite ease-in-out;
}

@keyframes movePhoton {
  0% { left: 0%; opacity: 0.2; }
  50% { opacity: 1; }
  100% { left: 95%; opacity: 0.2; }
}

/* ==========================================================================
   Offset Architecture Scan: Red vs Green Direct Comparison
   ========================================================================== */
.architecture-compare-wrap {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  margin-top: 48px;
}

.compare-column {
  border-radius: var(--radius-xl);
  padding: 38px;
  transition: var(--transition);
  position: relative;
}

.compare-column.legacy-bad {
  background: #fff5f5;
  border: 1px solid rgba(239, 68, 68, 0.25);
}

.compare-column.dedicated-good {
  background: #fefce8;
  border: 2px solid rgba(245, 158, 11, 0.45);
  box-shadow: 0 24px 50px rgba(217, 119, 6, 0.12);
}

.compare-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: 9999px;
  font-size: 13px;
  font-weight: 800;
  margin-bottom: 18px;
}

.compare-column.legacy-bad .compare-badge {
  background: rgba(239, 68, 68, 0.12);
  color: #b91c1c;
}

.compare-column.dedicated-good .compare-badge {
  background: linear-gradient(135deg, #d97706, #f59e0b);
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(217, 119, 6, 0.28);
}

.compare-title {
  font-size: 25px;
  font-weight: 900;
  margin-bottom: 12px;
}

.compare-column.legacy-bad .compare-title { color: #991b1b; }
.compare-column.dedicated-good .compare-title { color: #78350f; }

.compare-subtitle {
  font-size: 14.5px;
  color: #475569;
  margin-bottom: 28px;
  line-height: 1.6;
}

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

.compare-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  font-size: 14.5px;
  line-height: 1.55;
}

.compare-icon-badge {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-weight: 800;
  font-size: 13px;
  margin-top: 2px;
}

.compare-column.legacy-bad .compare-icon-badge {
  background: #fee2e2;
  color: #dc2626;
}

.compare-column.dedicated-good .compare-icon-badge {
  background: #fef3c7;
  color: #b45309;
}

.compare-item-content strong {
  display: block;
  font-weight: 800;
  color: #0f172a;
  margin-bottom: 2px;
}

.compare-item-content span {
  color: #64748b;
  font-size: 13.5px;
}

/* ==========================================================================
   Global POP Data Centers & Lines Directory
   ========================================================================== */
.pop-directory-card {
  background: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: 0 16px 40px rgba(15, 23, 42, 0.04);
}

.pop-table-wrapper {
  width: 100%;
  overflow-x: auto;
}

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

.pop-table th {
  background: #faf8f5;
  padding: 18px 20px;
  font-weight: 800;
  color: #475569;
  font-size: 13px;
  border-bottom: 1px solid #f1ece4;
  letter-spacing: 0.3px;
}

.pop-table td {
  padding: 20px;
  border-bottom: 1px solid #f1f5f9;
  color: #1e293b;
  vertical-align: middle;
}

.pop-table tr:hover td {
  background: #fdfcf9;
}

.pop-node-name {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  color: #0f172a;
}

.pop-flag {
  font-size: 20px;
}

.node-type-pill {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 800;
  background: var(--gold-light);
  color: var(--primary);
  border: 1px solid rgba(245, 158, 11, 0.25);
}

.node-ping-val {
  font-weight: 800;
  color: #b45309;
}

.node-bandwidth-val {
  font-weight: 700;
  color: var(--primary);
}

.node-load-bar-wrap {
  width: 110px;
  background: #e2e8f0;
  height: 6px;
  border-radius: 3px;
  overflow: hidden;
  display: inline-block;
  margin-right: 8px;
  vertical-align: middle;
}

.node-load-fill {
  height: 100%;
  background: #f59e0b;
  border-radius: 3px;
}

.node-status-indicator {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 700;
  font-size: 12.5px;
  color: #b45309;
}

/* ==========================================================================
   Multi-Scenario Acceleration Hub
   ========================================================================== */
.scenario-tabs {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.scenario-tab-btn {
  padding: 12px 24px;
  border-radius: 9999px;
  font-size: 15px;
  font-weight: 700;
  color: #475569;
  background: #ffffff;
  border: 1px solid #e2e8f0;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: var(--transition);
}

.scenario-tab-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-2px);
}

.scenario-tab-btn.active {
  background: linear-gradient(135deg, #d97706, #f59e0b);
  color: #ffffff;
  border-color: var(--primary);
  box-shadow: 0 8px 22px rgba(217, 119, 6, 0.35);
}

.scenario-display-box {
  background: #ffffff;
  border: 1px solid #fde68a;
  border-radius: var(--radius-xl);
  padding: 44px;
  box-shadow: 0 20px 48px rgba(120, 53, 15, 0.06);
  display: grid;
  grid-template-columns: 1fr 1.15fr;
  gap: 40px;
  align-items: center;
}

.scenario-info-title {
  font-size: 28px;
  font-weight: 900;
  color: #0f172a;
  margin-bottom: 14px;
}

.scenario-info-desc {
  font-size: 15.5px;
  color: #475569;
  line-height: 1.7;
  margin-bottom: 24px;
}

.scenario-feature-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 30px;
}

.scenario-feature-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14.5px;
  font-weight: 700;
  color: #1e293b;
}

.scenario-feature-item svg {
  color: var(--primary);
  width: 18px;
  height: 18px;
}

/* Modern SaaS Console Component */
.saas-console-mock {
  background: #fdfcf9;
  border: 1px solid #fde68a;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 12px 30px rgba(120, 53, 15, 0.08);
}

.saas-console-bar {
  background: #ffffff;
  padding: 12px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid #f1ece4;
}

.saas-dot-group {
  display: flex;
  gap: 6px;
}

.saas-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.saas-dot.r { background: #f87171; }
.saas-dot.y { background: #fbbf24; }
.saas-dot.g { background: #34d399; }

.saas-console-title {
  font-size: 12px;
  font-weight: 700;
  color: #64748b;
  letter-spacing: 0.5px;
}

.saas-console-body {
  padding: 24px;
}

.saas-metrics-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 20px;
}

.saas-metric-box {
  background: #ffffff;
  border: 1px solid #f1ece4;
  border-radius: var(--radius-sm);
  padding: 12px;
  text-align: center;
}

.saas-metric-val {
  font-size: 20px;
  font-weight: 900;
  color: var(--primary);
  letter-spacing: -0.5px;
}

.saas-metric-sub {
  font-size: 11px;
  color: #64748b;
  font-weight: 600;
}

.saas-stream-visual {
  background: #ffffff;
  border: 1px solid #f1ece4;
  border-radius: var(--radius-sm);
  padding: 16px;
}

.stream-node-flow {
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: relative;
}

.stream-node {
  background: var(--gold-light);
  border: 1px solid rgba(245, 158, 11, 0.35);
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 12px;
  font-weight: 700;
  color: var(--primary);
  text-align: center;
}

.stream-arrow {
  color: #f59e0b;
  font-size: 16px;
  font-weight: 800;
  animation: pulse-arrow 1.5s infinite;
}

@keyframes pulse-arrow {
  0%, 100% { transform: translateX(0); opacity: 0.6; }
  50% { transform: translateX(4px); opacity: 1; }
}

/* ==========================================================================
   Deep Sea Backbone Corridor (局部深色撞色 - 曜石深海与流金光子)
   ========================================================================== */
.backbone-corridor-section {
  background: #07172b;
  color: #ffffff;
  padding: 104px 0;
  position: relative;
  overflow: hidden;
}

#fiber-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  opacity: 0.85;
}

.backbone-content {
  position: relative;
  z-index: 2;
}

.backbone-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 50px;
}

.backbone-stat-box {
  background: rgba(13, 30, 52, 0.82);
  backdrop-filter: blur(14px);
  border: 1px solid rgba(245, 158, 11, 0.28);
  border-radius: var(--radius-lg);
  padding: 30px 24px;
  text-align: center;
  transition: var(--transition);
}

.backbone-stat-box:hover {
  background: rgba(13, 30, 52, 0.98);
  border-color: #f59e0b;
  transform: translateY(-6px);
  box-shadow: 0 18px 45px rgba(245, 158, 11, 0.3);
}

.backbone-number {
  font-size: 44px;
  font-weight: 900;
  background: linear-gradient(135deg, #fffbeb 0%, #fef08a 35%, #fbbf24 70%, #d97706 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1.1;
  margin-bottom: 8px;
  text-shadow: 0 0 25px rgba(245, 158, 11, 0.35);
}

.backbone-label {
  font-size: 15px;
  font-weight: 800;
  color: #fef08a;
  margin-bottom: 6px;
}

.backbone-desc {
  font-size: 13px;
  color: #cbd5e1;
  line-height: 1.5;
}

/* ==========================================================================
   Asymmetric Tiered Pricing Deck (严格四档约束)
   ========================================================================== */
.pricing-deck {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
  align-items: stretch;
  margin-top: 40px;
}

.pricing-switch-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 40px;
}

.billing-label {
  font-size: 15px;
  font-weight: 700;
  color: #475569;
  cursor: pointer;
}

.billing-label.active {
  color: var(--primary);
}

.switch-pill {
  width: 58px;
  height: 32px;
  background: #cbd5e1;
  border-radius: 9999px;
  position: relative;
  cursor: pointer;
  transition: var(--transition);
}

.switch-pill.annual {
  background: linear-gradient(135deg, #d97706, #f59e0b);
}

.switch-handle {
  width: 26px;
  height: 26px;
  background: #ffffff;
  border-radius: 50%;
  position: absolute;
  top: 3px;
  left: 3px;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
  transition: var(--transition);
}

.switch-pill.annual .switch-handle {
  left: 29px;
}

.discount-pill {
  font-size: 12px;
  font-weight: 800;
  background: #ef4444;
  color: #ffffff;
  padding: 3px 8px;
  border-radius: 9999px;
  margin-left: 6px;
}

.pricing-card {
  background: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: var(--radius-xl);
  padding: 34px 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition);
  position: relative;
}

.pricing-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-3d);
}

/* 尊享进阶·爆款主推放大并带金色呼吸光环 */
.pricing-card.featured {
  border: 2px solid #f59e0b;
  transform: scale(1.05);
  z-index: 5;
  box-shadow: 0 0 0 1px #f59e0b, 0 24px 50px rgba(245, 158, 11, 0.25);
  animation: breathing-glow 3s infinite alternate;
}

.pricing-card.featured:hover {
  transform: scale(1.06) translateY(-4px);
}

@keyframes breathing-glow {
  0% {
    box-shadow: 0 0 0 1px #f59e0b, 0 20px 40px rgba(245, 158, 11, 0.2);
  }
  100% {
    box-shadow: 0 0 0 3px rgba(251, 191, 36, 0.7), 0 28px 65px rgba(217, 119, 6, 0.45);
  }
}

.featured-ribbon {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, #d97706, #fbbf24);
  color: #ffffff;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.5px;
  padding: 4px 18px;
  border-radius: 9999px;
  box-shadow: 0 4px 12px rgba(217, 119, 6, 0.4);
}

.pricing-tier-name {
  font-size: 20px;
  font-weight: 900;
  color: #0f172a;
  margin-bottom: 6px;
}

.pricing-tier-desc {
  font-size: 13px;
  color: #64748b;
  min-height: 38px;
  margin-bottom: 20px;
}

.pricing-cost-wrap {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid #f1f5f9;
}

.pricing-currency {
  font-size: 20px;
  font-weight: 800;
  color: #0f172a;
}

.pricing-amount {
  font-size: 42px;
  font-weight: 900;
  color: #0f172a;
  letter-spacing: -1px;
}

.pricing-card.featured .pricing-amount {
  color: var(--primary);
}

.pricing-period {
  font-size: 13px;
  color: #64748b;
  font-weight: 600;
}

.pricing-specs-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 30px;
  flex-grow: 1;
}

.pricing-spec-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13.5px;
  color: #334155;
  font-weight: 600;
}

.pricing-spec-item svg {
  width: 16px;
  height: 16px;
  color: #b45309;
  flex-shrink: 0;
}

/* Trust Guarantee Bar below pricing */
.pricing-trust-bar {
  margin-top: 48px;
  background: #ffffff;
  border: 1px solid #fde68a;
  border-radius: var(--radius-lg);
  padding: 24px 32px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  box-shadow: 0 10px 30px rgba(120, 53, 15, 0.05);
}

.trust-bar-item {
  display: flex;
  align-items: center;
  gap: 14px;
}

.trust-bar-icon-3d {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--gold-light);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  border: 1px solid rgba(245, 158, 11, 0.25);
}

.trust-bar-icon-3d svg {
  width: 24px;
  height: 24px;
  color: var(--primary);
}

.trust-bar-title {
  font-size: 14px;
  font-weight: 800;
  color: #0f172a;
  margin-bottom: 2px;
}

.trust-bar-desc {
  font-size: 12px;
  color: #64748b;
}

/* ==========================================================================
   Modern Interactive Client Showcase
   ========================================================================== */
.client-showcase-container {
  background: #ffffff;
  border: 1px solid #fde68a;
  border-radius: var(--radius-xl);
  padding: 48px;
  box-shadow: 0 20px 48px rgba(120, 53, 15, 0.06);
}

.client-tabs-nav {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.client-tab-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: var(--radius-md);
  font-size: 14.5px;
  font-weight: 700;
  color: #475569;
  background: #fdfcf9;
  border: 1px solid #f1ece4;
  transition: var(--transition);
}

.client-tab-btn.active {
  background: linear-gradient(135deg, #d97706, #f59e0b);
  color: #ffffff;
  border-color: var(--primary);
  box-shadow: 0 6px 18px rgba(217, 119, 6, 0.35);
}

.client-interactive-grid {
  display: grid;
  grid-template-columns: 1fr 1.05fr;
  gap: 44px;
  align-items: center;
}

.client-mockup-wrapper {
  background: linear-gradient(135deg, #fffbeb 0%, #fef3c7 100%);
  border: 1px solid #fde68a;
  border-radius: var(--radius-lg);
  padding: 34px;
  display: flex;
  justify-content: center;
}

.client-app-ui {
  width: 320px;
  background: #ffffff;
  border-radius: 24px;
  box-shadow: 0 24px 48px rgba(217, 119, 6, 0.18), 0 4px 10px rgba(0, 0, 0, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.9);
  overflow: hidden;
}

.client-app-header {
  padding: 18px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid #f1ece4;
}

.app-status-badge {
  font-size: 12px;
  font-weight: 800;
  padding: 3px 10px;
  border-radius: 9999px;
  background: #fefce8;
  color: #854d0e;
  border: 1px solid rgba(245, 158, 11, 0.3);
}

.client-app-body {
  padding: 30px 22px;
  text-align: center;
}

.client-power-btn {
  width: 94px;
  height: 94px;
  border-radius: 50%;
  margin: 0 auto 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  background: linear-gradient(135deg, #d97706, #fbbf24);
  box-shadow: 0 12px 30px rgba(217, 119, 6, 0.4);
  cursor: pointer;
  transition: var(--transition);
}

.client-power-btn svg {
  width: 44px;
  height: 44px;
}

.client-power-btn:hover {
  transform: scale(1.06);
}

.client-connection-status {
  font-size: 16px;
  font-weight: 900;
  color: #0f172a;
  margin-bottom: 4px;
}

.client-ip-text {
  font-size: 12px;
  color: #64748b;
  margin-bottom: 24px;
  font-weight: 600;
}

.client-server-picker {
  background: #fdfcf9;
  border: 1px solid #f1ece4;
  border-radius: 12px;
  padding: 12px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  cursor: pointer;
}

.client-speed-gauges {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  background: #fdfcf9;
  border-radius: 12px;
  padding: 12px;
}

.gauge-item-val {
  font-size: 15px;
  font-weight: 900;
  color: #0f172a;
}

.gauge-item-sub {
  font-size: 11px;
  color: #64748b;
  font-weight: 600;
}

/* ==========================================================================
   Wall of Love (真实客户口碑墙)
   ========================================================================== */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.testimonial-card {
  background: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: var(--radius-lg);
  padding: 30px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition);
}

.testimonial-card:hover {
  transform: translateY(-4px);
  border-color: var(--primary);
  box-shadow: var(--shadow-3d);
}

.testimonial-rating {
  color: #f59e0b;
  margin-bottom: 14px;
  font-size: 16px;
}

.testimonial-text {
  font-size: 14.5px;
  color: #334155;
  line-height: 1.65;
  margin-bottom: 20px;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-top: 16px;
  border-top: 1px solid #f1f5f9;
}

.author-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--gold-light);
  color: var(--primary);
  border: 1px solid rgba(245, 158, 11, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  font-size: 16px;
}

.author-name {
  font-size: 14.5px;
  font-weight: 800;
  color: #0f172a;
}

.author-role {
  font-size: 12px;
  color: #64748b;
  font-weight: 500;
}

/* ==========================================================================
   Interactive FAQ Accordion
   ========================================================================== */
.faq-accordion-container {
  max-width: 880px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-item {
  background: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
}

.faq-item.active {
  border-color: var(--primary);
  box-shadow: 0 8px 22px rgba(217, 119, 6, 0.12);
}

.faq-question-btn {
  width: 100%;
  text-align: left;
  padding: 20px 24px;
  font-size: 16px;
  font-weight: 800;
  color: #0f172a;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: none;
}

.faq-icon-arrow {
  font-size: 14px;
  color: #64748b;
  transition: transform 0.25s ease;
}

.faq-item.active .faq-icon-arrow {
  transform: rotate(180deg);
  color: var(--primary);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease;
  padding: 0 24px;
  color: #475569;
  font-size: 14.5px;
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  max-height: 320px;
  padding-bottom: 22px;
}

/* ==========================================================================
   Technical Whitepapers Portal (权威白皮书专栏)
   ========================================================================== */
.whitepapers-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.whitepaper-card {
  background: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: var(--radius-lg);
  padding: 30px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition);
}

.whitepaper-card:hover {
  transform: translateY(-4px);
  border-color: var(--primary);
  box-shadow: var(--shadow-3d);
}

.whitepaper-tag {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 800;
  background: var(--gold-light);
  color: var(--primary);
  border: 1px solid rgba(245, 158, 11, 0.25);
  margin-bottom: 12px;
}

.whitepaper-title {
  font-size: 18px;
  font-weight: 900;
  color: #0f172a;
  margin-bottom: 8px;
  line-height: 1.4;
}

.whitepaper-snippet {
  font-size: 13.5px;
  color: #64748b;
  line-height: 1.6;
  margin-bottom: 20px;
}

.whitepaper-read-link {
  font-size: 14px;
  font-weight: 800;
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.whitepaper-read-link:hover {
  color: #b45309;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  background: #07172b;
  color: #94a3b8;
  padding: 76px 0 36px;
  border-top: 1px solid rgba(245, 158, 11, 0.2);
  font-size: 14px;
}

.footer-top-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 56px;
}

.footer-brand-title {
  font-size: 20px;
  font-weight: 900;
  color: #ffffff;
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}

.footer-brand-desc {
  line-height: 1.7;
  margin-bottom: 20px;
  max-width: 340px;
}

.footer-col-title {
  font-size: 15px;
  font-weight: 800;
  color: #fef08a;
  margin-bottom: 18px;
  letter-spacing: 0.3px;
}

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

.footer-link {
  color: #94a3b8;
  transition: var(--transition);
}

.footer-link:hover {
  color: #fbbf24;
  transform: translateX(3px);
}

.footer-bottom-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 30px;
  border-top: 1px solid rgba(148, 163, 184, 0.12);
  font-size: 13px;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-cert-badges {
  display: flex;
  align-items: center;
  gap: 16px;
}

.cert-badge-pill {
  padding: 4px 10px;
  border-radius: 6px;
  background: rgba(245, 158, 11, 0.12);
  font-size: 11px;
  font-weight: 700;
  color: #fde68a;
  border: 1px solid rgba(245, 158, 11, 0.25);
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
@media (max-width: 1100px) {
  .asym-matrix-grid { grid-template-columns: repeat(6, 1fr); }
  .asym-card.col-span-7 { grid-column: span 6; }
  .asym-card.col-span-5 { grid-column: span 6; }
  .asym-card.col-span-4 { grid-column: span 3; }
  .asym-card.col-span-4-mid { grid-column: span 3; }
  .asym-card.col-span-4-right { grid-column: span 6; }
  .asym-card.col-span-12 { grid-column: span 6; }
  .platform-devices-row { grid-template-columns: repeat(3, 1fr); }
  .pricing-deck { grid-template-columns: repeat(2, 1fr); }
  .backbone-grid { grid-template-columns: repeat(2, 1fr); }
  .pricing-card.featured { transform: none; }
}

@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; }
  .architecture-compare-wrap { grid-template-columns: 1fr; }
  .scenario-display-box { grid-template-columns: 1fr; }
  .client-interactive-grid { grid-template-columns: 1fr; }
  .testimonials-grid { grid-template-columns: 1fr; }
  .whitepapers-grid { grid-template-columns: 1fr; }
  .pricing-trust-bar { grid-template-columns: repeat(2, 1fr); }
  .f-main-grid { grid-template-columns: 1fr; }
  .f-diagnostic-canvas { position: static; }
  .footer-top-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .mobile-menu-btn { display: block; }
  .asym-matrix-grid { grid-template-columns: 1fr; }
  .asym-card.col-span-7,
  .asym-card.col-span-5,
  .asym-card.col-span-4,
  .asym-card.col-span-4-mid,
  .asym-card.col-span-4-right,
  .asym-card.col-span-12 { grid-column: span 1; }
  .platform-devices-row { grid-template-columns: repeat(2, 1fr); }
  .pricing-deck { grid-template-columns: 1fr; }
  .hero-title { font-size: 34px; }
  .hero-narrative-card { padding: 26px; }
  .pricing-trust-bar { grid-template-columns: 1fr; }
  .footer-top-grid { grid-template-columns: 1fr; }
}

/* ==========================================================================
   Article & Tutorial Pages Typography & Modern Layouts
   ========================================================================== */
.inner-page-header {
  padding: 56px 0 38px;
  background: linear-gradient(180deg, #fffbeb 0%, #faf8f5 100%);
  border-bottom: 1px solid rgba(245, 158, 11, 0.15);
  position: relative;
}

.inner-page-header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, #d97706, #fbbf24, #f59e0b);
}

.breadcrumb-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13.5px;
  color: #64748b;
  margin-bottom: 16px;
}

.breadcrumb-nav a {
  color: #d97706;
  text-decoration: none;
  font-weight: 600;
  transition: var(--transition);
}

.breadcrumb-nav a:hover {
  color: #b45309;
  text-decoration: underline;
}

.breadcrumb-sep {
  color: #cbd5e1;
  font-size: 12px;
}

/* Article & Tutorial Layout */
.article-layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 48px;
  align-items: start;
  padding-top: 40px;
  padding-bottom: 80px;
}

/* Sticky Sidebar TOC */
.article-toc {
  position: sticky;
  top: 90px;
  background: #ffffff;
  border-radius: var(--radius-lg);
  padding: 24px 20px;
  border: 1px solid var(--border-light);
  box-shadow: 0 12px 32px rgba(15, 23, 42, 0.04);
  max-height: calc(100vh - 120px);
  overflow-y: auto;
  z-index: 10;
}

.toc-title {
  font-size: 13px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--primary);
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid #f1f5f9;
  display: flex;
  align-items: center;
  gap: 6px;
}

.toc-list {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.toc-link {
  font-size: 13.5px;
  color: #475569;
  text-decoration: none;
  padding: 8px 12px;
  border-radius: 8px;
  transition: var(--transition);
  line-height: 1.45;
  border-left: 3px solid transparent;
  display: block;
}

.toc-link:hover,
.toc-link.active {
  color: #d97706;
  background: #fffbeb;
  border-left-color: #f59e0b;
  font-weight: 700;
  transform: translateX(3px);
}

/* Article Content Core Typography */
.article-content {
  min-width: 0;
  color: #334155;
  line-height: 1.85;
}

.article-content h2 {
  font-size: 26px;
  font-weight: 850;
  color: #0f172a;
  margin-top: 50px;
  margin-bottom: 20px;
  padding-bottom: 14px;
  border-bottom: 2px solid #f1f5f9;
  position: relative;
  letter-spacing: -0.01em;
  scroll-margin-top: 90px;
}

.article-content h2::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 50px;
  height: 2px;
  background: linear-gradient(90deg, #d97706, #fbbf24);
  border-radius: 2px;
}

.article-content h2:first-of-type {
  margin-top: 0;
}

.article-content p {
  font-size: 15.5px;
  line-height: 1.85;
  color: #334155;
  margin-bottom: 20px;
}

.article-intro-lead {
  font-size: 16.5px;
  line-height: 1.85;
  color: #1e293b;
  background: #f8fafc;
  padding: 18px 22px;
  border-radius: var(--radius-md);
  border-left: 4px solid var(--primary);
  margin-bottom: 30px;
}

/* Quick Jump Platform Pills Bar */
.platform-jump-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding: 14px 18px;
  background: #ffffff;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  margin-bottom: 36px;
  box-shadow: 0 4px 14px rgba(15, 23, 42, 0.03);
}

.jump-pill-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: 20px;
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  color: #1e293b;
  font-size: 13.5px;
  font-weight: 600;
  text-decoration: none;
  transition: var(--transition);
}

.jump-pill-btn:hover {
  background: #fffbeb;
  border-color: #f59e0b;
  color: #d97706;
  transform: translateY(-1px);
  box-shadow: 0 4px 10px rgba(245, 158, 11, 0.15);
}

/* 3-Step Core Flow Cards */
.steps-overview-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin: 28px 0 44px;
}

.step-overview-card {
  background: #ffffff;
  border: 1px solid rgba(226, 232, 240, 0.9);
  border-radius: var(--radius-lg);
  padding: 26px 22px;
  position: relative;
  transition: var(--transition);
  box-shadow: 0 10px 25px rgba(15, 23, 42, 0.03);
  display: flex;
  flex-direction: column;
}

.step-overview-card:hover {
  transform: translateY(-4px);
  border-color: #f59e0b;
  box-shadow: 0 18px 36px rgba(245, 158, 11, 0.12);
}

.step-badge-num {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
  color: #ffffff;
  font-size: 18px;
  font-weight: 900;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  box-shadow: 0 8px 18px rgba(217, 119, 6, 0.25);
}

.step-card-title {
  font-size: 17px;
  font-weight: 800;
  color: #0f172a;
  margin-bottom: 10px;
}

.step-card-desc {
  font-size: 14px;
  color: #475569;
  line-height: 1.7;
  flex: 1;
}

.step-card-tag {
  display: inline-block;
  margin-top: 14px;
  font-size: 11.5px;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 6px;
  background: #fffbeb;
  color: #b45309;
  border: 1px solid #fde68a;
  width: fit-content;
}

/* Platform Guide Card Component */
.platform-guide-card {
  background: #ffffff;
  border-radius: var(--radius-xl);
  border: 1px solid #e2e8f0;
  margin-bottom: 40px;
  box-shadow: 0 12px 35px rgba(15, 23, 42, 0.04);
  overflow: hidden;
  transition: var(--transition);
}

.platform-guide-card:hover {
  border-color: rgba(245, 158, 11, 0.4);
  box-shadow: 0 18px 45px rgba(15, 23, 42, 0.06);
}

.platform-guide-header {
  padding: 24px 28px;
  background: linear-gradient(90deg, #f8fafc 0%, #ffffff 100%);
  border-bottom: 1px solid #e2e8f0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.platform-title-group {
  display: flex;
  align-items: center;
  gap: 14px;
}

.platform-icon-box {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  background: #0f172a;
  color: #fbbf24;
  font-size: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 8px 16px rgba(15, 23, 42, 0.15);
}

.platform-name {
  font-size: 20px;
  font-weight: 850;
  color: #0f172a;
}

.platform-sub-info {
  font-size: 13px;
  color: #64748b;
  margin-top: 2px;
}

.platform-badges {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.software-badge {
  font-size: 12px;
  font-weight: 700;
  padding: 5px 12px;
  border-radius: 20px;
  background: #fffbeb;
  color: #b45309;
  border: 1px solid #fde68a;
}

.platform-guide-body {
  padding: 30px 28px 24px;
}

.platform-desc-text {
  font-size: 15px;
  color: #475569;
  line-height: 1.75;
  margin-bottom: 26px;
}

/* Modern Step Timeline */
.step-stream {
  display: flex;
  flex-direction: column;
  gap: 20px;
  position: relative;
}

.step-stream-item {
  display: flex;
  gap: 18px;
  position: relative;
}

.step-stream-item:not(:last-child)::before {
  content: '';
  position: absolute;
  top: 36px;
  left: 17px;
  bottom: -20px;
  width: 2px;
  background: #e2e8f0;
}

.step-circle-num {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: #f1f5f9;
  border: 2px solid #cbd5e1;
  color: #334155;
  font-size: 14px;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  z-index: 2;
  transition: var(--transition);
}

.step-stream-item:hover .step-circle-num {
  background: #f59e0b;
  border-color: #d97706;
  color: #ffffff;
  transform: scale(1.1);
}

.step-stream-content {
  flex: 1;
  background: #f8fafc;
  border: 1px solid #edf2f7;
  border-radius: var(--radius-md);
  padding: 16px 20px;
  transition: var(--transition);
}

.step-stream-item:hover .step-stream-content {
  background: #ffffff;
  border-color: rgba(245, 158, 11, 0.35);
  box-shadow: 0 8px 20px rgba(15, 23, 42, 0.04);
}

.step-title-line {
  font-size: 15px;
  font-weight: 800;
  color: #0f172a;
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.step-detail-text {
  font-size: 14px;
  color: #475569;
  line-height: 1.7;
}

.step-highlight {
  display: inline-block;
  padding: 2px 7px;
  border-radius: 4px;
  background: rgba(217, 119, 6, 0.08);
  color: #b45309;
  font-weight: 700;
  border: 1px solid rgba(217, 119, 6, 0.18);
  font-size: 13px;
}

/* Expert Tip Callout */
.guide-callout {
  margin-top: 24px;
  padding: 16px 20px;
  border-radius: var(--radius-md);
  background: #eff6ff;
  border-left: 4px solid #3b82f6;
  font-size: 14px;
  line-height: 1.7;
  color: #1e3a8a;
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.guide-callout.callout-gold {
  background: #fffbeb;
  border-left-color: #f59e0b;
  color: #92400e;
}

.callout-icon {
  font-size: 18px;
  line-height: 1;
  flex-shrink: 0;
  margin-top: 2px;
}

/* Feature Deep Comparison Box (TUN vs Proxy) */
.comparison-card-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin: 24px 0 32px;
}

.comparison-box {
  border-radius: var(--radius-lg);
  padding: 24px;
  border: 1px solid;
}

.comparison-box.box-traditional {
  background: #f8fafc;
  border-color: #e2e8f0;
}

.comparison-box.box-tun {
  background: linear-gradient(135deg, #fffbeb 0%, #ffffff 100%);
  border-color: #fde68a;
  box-shadow: 0 10px 25px rgba(245, 158, 11, 0.08);
  position: relative;
}

.box-title {
  font-size: 16px;
  font-weight: 800;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.box-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 13.5px;
  line-height: 1.6;
}

.box-list li {
  display: flex;
  align-items: flex-start;
  gap: 8px;
}

/* Responsive Overrides for Articles & Tutorials */
@media (max-width: 992px) {
  .article-layout {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  .article-toc {
    position: static;
    max-height: none;
  }
  .steps-overview-grid {
    grid-template-columns: 1fr;
  }
  .comparison-card-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 600px) {
  .platform-guide-header {
    flex-direction: column;
    align-items: flex-start;
  }
  .platform-guide-body {
    padding: 20px 16px;
  }
  .step-stream-content {
    padding: 14px 16px;
  }
}