/* ===================================================================
   悠兔机场 (YouTu Airport) - 多入口网络编排系统样式表
   主设计主题：多入口网络编排 / 深蓝绿科技风
   =================================================================== */

:root {
  --bg-main: #08131D;
  --bg-secondary: #102333;
  --bg-tertiary: #132C3E;
  --bg-panel: #16344A;
  --text-main: #F5FAFC;
  --text-body: #C5D2DB;
  --text-muted: #90A5B2;
  --primary-blue: #55B7FF;
  --line-cyan: #46D3B4;
  --multiplier-orange: #F2B35D;
  --border-color: rgba(140, 180, 200, 0.18);
  --border-active: rgba(85, 183, 255, 0.4);
  --border-cyan: rgba(70, 211, 180, 0.4);
  --shadow-subtle: 0 4px 20px rgba(0, 0, 0, 0.25);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --container-max: 1240px;
  --font-main: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
  --font-code: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

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

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

body {
  font-family: var(--font-main);
  background-color: var(--bg-main);
  color: var(--text-body);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--primary-blue);
  text-decoration: none;
  transition: color 0.2s ease, opacity 0.2s ease;
}

a:hover {
  color: #8ed0ff;
}

ul, ol {
  list-style: none;
}

img, svg {
  max-width: 100%;
  vertical-align: middle;
}

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

/* ================= Header ================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(8, 19, 29, 0.94);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  height: 72px;
}

.header-inner,
.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
  height: 72px;
}

.brand-wrap,
.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.brand-name {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-main);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 20px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links li {
  margin: 0;
  padding: 0;
}

.nav-links li a {
  font-size: 15px;
  color: var(--text-body);
  font-weight: 500;
  text-decoration: none;
  transition: color 0.2s ease;
  white-space: nowrap;
}

.nav-links li a:hover,
.nav-links li a.active {
  color: var(--text-main);
}

.nav-actions {
  display: flex;
  align-items: center;
  margin-left: 12px;
}

.menu-toggle {
  display: none;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 9px 20px;
  font-size: 14px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.15s ease, filter 0.15s ease;
  white-space: nowrap;
}

.btn-primary {
  color: #08131D;
  background: linear-gradient(135deg, var(--line-cyan) 0%, var(--primary-blue) 100%);
  border: none;
}

.btn-primary:hover {
  color: #08131D;
  filter: brightness(1.1);
  transform: translateY(-1px);
}

.btn-outline {
  color: var(--text-main);
  background: transparent;
  border: 1px solid var(--border-color);
}

.btn-outline:hover {
  border-color: var(--primary-blue);
  color: var(--primary-blue);
}

.brand-icon, svg.brand-icon {
  width: 36px;
  height: 36px;
  max-width: 36px;
  max-height: 36px;
  flex-shrink: 0;
  display: inline-block;
}

.brand-texts {
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.2;
}

.brand-sub {
  font-size: 12px;
  color: var(--line-cyan);
  line-height: 1.2;
  margin-top: 2px;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-link {
  font-size: 15px;
  color: var(--text-body);
  font-weight: 500;
  transition: color 0.2s ease;
}

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

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

.btn-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 9px 20px;
  font-size: 14px;
  font-weight: 600;
  color: #08131D;
  background: linear-gradient(135deg, var(--line-cyan) 0%, var(--primary-blue) 100%);
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: transform 0.15s ease, filter 0.15s ease;
  white-space: nowrap;
}

.btn-cta:hover {
  color: #08131D;
  filter: brightness(1.1);
  transform: translateY(-1px);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 9px 18px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-main);
  background-color: var(--bg-panel);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background-color 0.2s ease, border-color 0.2s ease;
  white-space: nowrap;
}

.btn-secondary:hover {
  background-color: var(--bg-tertiary);
  border-color: var(--primary-blue);
  color: var(--text-main);
}

/* Mobile Menu Button */
.mobile-menu-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-main);
  padding: 8px 12px;
  font-size: 14px;
  cursor: pointer;
}

.mobile-menu-panel {
  display: none;
  position: absolute;
  top: 72px;
  left: 0;
  right: 0;
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  padding: 20px 24px;
  box-shadow: 0 16px 30px rgba(0, 0, 0, 0.4);
}

.mobile-menu-panel.active {
  display: block;
}

.mobile-menu-links {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 20px;
}

.mobile-nav-link {
  font-size: 16px;
  color: var(--text-main);
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(140, 180, 200, 0.1);
}

/* ================= Hero Section ================= */
.hero-section {
  position: relative;
  background-color: var(--bg-main);
  border-bottom: 1px solid var(--border-color);
  padding-top: 80px;
  padding-bottom: 80px;
}

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

.hero-header {
  text-align: center;
  max-width: 880px;
  margin: 0 auto 36px auto;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background-color: rgba(70, 211, 180, 0.1);
  border: 1px solid var(--border-cyan);
  color: var(--line-cyan);
  font-size: 13px;
  font-weight: 600;
  padding: 4px 14px;
  border-radius: 20px;
  margin-bottom: 16px;
}

.hero-tag-dot {
  width: 6px;
  height: 6px;
  background-color: var(--line-cyan);
  border-radius: 50%;
  animation: pulse-dot 2.4s infinite;
}

.hero-brand {
  font-size: clamp(48px, 5.5vw, 62px);
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.15;
  letter-spacing: -0.5px;
  margin-bottom: 8px;
}

.hero-slogan {
  font-size: clamp(40px, 4.8vw, 54px);
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.2;
  margin-bottom: 14px;
}

.hero-h1 {
  font-size: clamp(21px, 2.5vw, 28px);
  font-weight: 600;
  color: var(--line-cyan);
  line-height: 1.35;
  margin-bottom: 16px;
}

.hero-desc {
  font-size: clamp(16px, 1.8vw, 18px);
  color: var(--text-body);
  line-height: 1.7;
  max-width: 820px;
  margin: 0 auto 28px auto;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 36px;
}

/* Hero Network Orchestration Diagram */
.hero-network-wrap {
  width: 100%;
  max-width: 1080px;
  margin: 0 auto;
  background-color: rgba(16, 35, 51, 0.7);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
}

.network-diagram-desktop {
  display: block;
  width: 100%;
  height: auto;
}

.network-diagram-mobile {
  display: none;
}

/* ================= Sections Shared ================= */
.site-section {
  padding: 80px 0;
  border-bottom: 1px solid var(--border-color);
  position: relative;
}

.section-dark {
  background-color: var(--bg-main);
}

.section-alt {
  background-color: var(--bg-secondary);
}

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

.section-num {
  font-family: var(--font-code);
  font-size: 13px;
  font-weight: 700;
  color: var(--primary-blue);
  letter-spacing: 1px;
  display: block;
  margin-bottom: 8px;
}

.section-title {
  font-size: clamp(24px, 3vw, 32px);
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.3;
}

.section-intro {
  font-size: 16px;
  color: var(--text-body);
  margin-top: 12px;
  max-width: 840px;
  line-height: 1.7;
}

/* ================= Section 01: Multi-Entry ================= */
.orchestration-grid {
  display: grid;
  grid-template-columns: 280px 1fr 280px;
  gap: 24px;
  align-items: center;
}

.entry-col, .route-col {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.entry-node {
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--primary-blue);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.entry-node:hover {
  transform: translateX(4px);
  border-color: var(--primary-blue);
}

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

.entry-code {
  font-family: var(--font-code);
  font-size: 12px;
  font-weight: 700;
  color: var(--primary-blue);
}

.entry-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-main);
}

.entry-desc {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.5;
}

.orchestration-hub {
  background-color: var(--bg-panel);
  border: 1px solid var(--border-active);
  border-radius: var(--radius-lg);
  padding: 28px;
  text-align: center;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

.hub-badge {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  color: var(--line-cyan);
  background-color: rgba(70, 211, 180, 0.12);
  padding: 4px 12px;
  border-radius: 20px;
  margin-bottom: 12px;
}

.hub-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 10px;
}

.hub-text {
  font-size: 14px;
  color: var(--text-body);
  line-height: 1.6;
}

/* ================= Section 02: Three-Network IEPL ================= */
.isp-pipeline {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.isp-row {
  display: grid;
  grid-template-columns: 200px 80px 1fr 200px;
  align-items: center;
  gap: 20px;
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px 24px;
}

.isp-meta {
  display: flex;
  align-items: center;
  gap: 12px;
}

.isp-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  flex-shrink: 0;
}

.dot-telecom { background-color: #55B7FF; }
.dot-unicom { background-color: #F2B35D; }
.dot-mobile { background-color: #46D3B4; }

.isp-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-main);
}

.isp-arrow {
  text-align: center;
  color: var(--text-muted);
}

.isp-pipeline-desc {
  font-size: 14px;
  color: var(--text-body);
  line-height: 1.6;
}

.isp-target {
  background-color: var(--bg-panel);
  border: 1px solid var(--border-cyan);
  border-radius: var(--radius-sm);
  padding: 8px 14px;
  text-align: center;
  font-size: 13px;
  font-weight: 600;
  color: var(--line-cyan);
}

/* ================= Section 03 & 04: Passthrough & Mobile Tunnel ================= */
.feature-asymmetric {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.asymmetric-panel {
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.asymmetric-tag {
  font-size: 12px;
  font-weight: 700;
  color: var(--line-cyan);
  letter-spacing: 0.5px;
  margin-bottom: 12px;
}

.asymmetric-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 14px;
  line-height: 1.4;
}

.asymmetric-desc {
  font-size: 15px;
  color: var(--text-body);
  line-height: 1.7;
  margin-bottom: 24px;
}

/* Dedicated Route Flow for Mobile Tunnel */
.tunnel-flow-route {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 16px;
  background-color: var(--bg-panel);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  margin-top: auto;
  overflow-x: auto;
}

.route-step {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 90px;
}

.route-step-tag {
  font-size: 11px;
  color: var(--text-muted);
}

.route-step-val {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-main);
}

.route-step-val.cyan { color: var(--line-cyan); }
.route-step-val.orange { color: var(--multiplier-orange); }

.route-arrow {
  color: var(--text-muted);
  font-size: 14px;
  flex-shrink: 0;
}

/* ================= Section 05: Dynamic Multiplier ================= */
.multiplier-bar-group {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 960px;
  margin: 0 auto;
}

.multiplier-item {
  display: grid;
  grid-template-columns: 160px 1fr 140px;
  align-items: center;
  gap: 24px;
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px 24px;
}

.multiplier-level {
  display: flex;
  align-items: center;
  gap: 10px;
}

.multiplier-badge {
  font-size: 13px;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
}

.badge-low {
  background-color: rgba(70, 211, 180, 0.15);
  color: var(--line-cyan);
  border: 1px solid var(--border-cyan);
}

.badge-regular {
  background-color: rgba(85, 183, 255, 0.15);
  color: var(--primary-blue);
  border: 1px solid var(--border-active);
}

.badge-switch {
  background-color: rgba(242, 179, 93, 0.15);
  color: var(--multiplier-orange);
  border: 1px solid rgba(242, 179, 93, 0.4);
}

.multiplier-info {
  font-size: 14px;
  color: var(--text-body);
  line-height: 1.6;
}

.multiplier-scene {
  text-align: right;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
}

/* ================= Section 06: Backend Load Balancing ================= */
.lb-flow-container {
  display: grid;
  grid-template-columns: 240px 80px 1fr 80px 240px;
  align-items: center;
  gap: 16px;
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
}

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

.lb-box {
  background-color: var(--bg-panel);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 14px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-main);
  text-align: center;
}

.lb-center {
  background-color: var(--bg-secondary);
  border: 1px solid var(--primary-blue);
  border-radius: var(--radius-md);
  padding: 24px;
  text-align: center;
}

.lb-center-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--primary-blue);
  margin-bottom: 8px;
}

.lb-center-desc {
  font-size: 13px;
  color: var(--text-body);
  line-height: 1.6;
}

.lb-arrow-col {
  text-align: center;
  color: var(--text-muted);
}

/* ================= Section 07: AI & Streaming ================= */
.parallel-routes-wrap {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.parallel-route-lane {
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 28px;
}

.lane-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 16px;
}

.lane-indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.lane-indicator.ai { background-color: var(--primary-blue); }
.lane-indicator.media { background-color: var(--line-cyan); }

.lane-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-main);
}

.service-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 16px;
}

.service-pill {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-main);
  background-color: var(--bg-panel);
  border: 1px solid var(--border-color);
  padding: 6px 14px;
  border-radius: var(--radius-sm);
}

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

/* ================= Section 08: Client ================= */
.client-compare-strip {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
}

.client-box {
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px;
}

.client-box.featured {
  border-color: var(--primary-blue);
  background-color: rgba(22, 52, 74, 0.5);
}

.client-tag {
  font-size: 12px;
  font-weight: 700;
  color: var(--line-cyan);
  margin-bottom: 8px;
}

.client-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 12px;
}

.client-desc {
  font-size: 15px;
  color: var(--text-body);
  line-height: 1.7;
  margin-bottom: 20px;
}

.client-specs {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.spec-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--text-body);
}

.spec-check {
  color: var(--line-cyan);
  font-weight: 700;
}

/* ================= Section 09: Five-Stream Plans Orchestration ================= */
.plans-quick-guide {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  background: rgba(16, 35, 51, 0.7);
  border: 1px solid var(--border-color);
  border-radius: 30px;
  padding: 10px 24px;
  margin: 0 auto 36px;
  max-width: 920px;
}

.quick-guide-label {
  color: var(--line-cyan);
  font-weight: 700;
  font-size: 13px;
}

.quick-guide-chip {
  font-size: 13px;
  color: var(--text-body);
}

.quick-guide-chip em {
  font-style: normal;
  color: var(--text-muted);
}

.guide-arrow {
  color: var(--primary-blue);
  font-weight: bold;
  margin: 0 4px;
}

.quick-guide-chip strong {
  color: var(--text-main);
  font-weight: 600;
}

.quick-guide-divider {
  color: var(--border-color);
  font-weight: bold;
}

.plans-flow-wrapper {
  position: relative;
  margin-bottom: 36px;
}

.plans-ingress-bar {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-bottom: 24px;
}

.ingress-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-panel);
  border: 1px solid var(--border-cyan);
  padding: 6px 18px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 700;
  color: var(--line-cyan);
  margin-bottom: 16px;
}

.ingress-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--line-cyan);
  box-shadow: 0 0 8px var(--line-cyan);
}

.ingress-bus-rail {
  width: 100%;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
  position: relative;
}

.ingress-bus-rail::before {
  content: '';
  position: absolute;
  top: 9px;
  left: 10%;
  right: 10%;
  height: 2px;
  background: linear-gradient(90deg, rgba(85, 183, 255, 0.2) 0%, rgba(70, 211, 180, 0.6) 50%, rgba(85, 183, 255, 0.2) 100%);
  z-index: 1;
}

.bus-branch-point {
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  height: 20px;
  z-index: 2;
}

.bus-branch-point span {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-muted);
  border: 2px solid var(--bg-main);
  transition: all 0.3s ease;
}

.bus-branch-point.featured span {
  width: 12px;
  height: 12px;
  background: var(--line-cyan);
  box-shadow: 0 0 10px var(--line-cyan);
}

.plans-flow-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
  align-items: stretch;
}

.plan-stream-card {
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px 18px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  transition: all 0.25s ease;
  min-height: auto;
}

.plan-stream-card:hover {
  border-color: var(--border-active);
  transform: translateY(-3px);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.3);
}

.plan-top-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--line-cyan);
  color: #08131D;
  font-size: 11px;
  font-weight: 800;
  padding: 3px 12px;
  border-radius: 12px;
  letter-spacing: 0.5px;
  box-shadow: 0 2px 8px rgba(70, 211, 180, 0.4);
  white-space: nowrap;
}

.plan-top-badge.badge-backup {
  background: var(--bg-panel);
  color: var(--text-muted);
  border: 1px solid var(--border-color);
  box-shadow: none;
}

.plan-featured-tier {
  border: 2px solid var(--line-cyan);
  background: linear-gradient(180deg, rgba(22, 52, 74, 0.95) 0%, rgba(19, 44, 62, 0.98) 100%);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35), 0 0 20px rgba(70, 211, 180, 0.15);
}

.plan-card-route {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 14px;
  font-size: 11px;
}

.route-code {
  color: var(--text-muted);
  font-family: var(--font-code);
  font-weight: 600;
  letter-spacing: 0.5px;
}

.route-status {
  color: var(--text-muted);
  background: rgba(255, 255, 255, 0.05);
  padding: 2px 8px;
  border-radius: 4px;
}

.route-status.active {
  color: var(--line-cyan);
  background: rgba(70, 211, 180, 0.12);
  font-weight: 600;
}

.plan-card-name {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 8px;
  line-height: 1.3;
}

.plan-card-price {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 4px;
}

.price-val {
  font-size: 38px;
  font-weight: 800;
  color: var(--primary-blue);
  line-height: 1.1;
}

.plan-featured-tier .price-val {
  color: var(--line-cyan);
}

.price-unit {
  font-size: 14px;
  color: var(--text-muted);
  font-weight: 500;
}

.plan-card-traffic {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.3;
  margin-bottom: 16px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border-color);
}

.plan-card-traffic.featured-traffic {
  color: var(--line-cyan);
}

.plan-fit-title {
  font-size: 12px;
  font-weight: 700;
  color: var(--text-muted);
  margin-bottom: 10px;
  letter-spacing: 0.5px;
}

.plan-fit-list {
  list-style: none;
  padding: 0;
  margin: 0 0 24px 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.plan-fit-list li {
  font-size: 13px;
  color: var(--text-body);
  display: flex;
  align-items: center;
  gap: 8px;
  line-height: 1.4;
}

.fit-check {
  color: var(--line-cyan);
  font-weight: 700;
  font-size: 12px;
}

.plan-card-foot {
  margin-top: auto;
}

.btn-plan {
  display: block;
  width: 100%;
  text-align: center;
  padding: 12px 14px;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  transition: all 0.2s ease;
  cursor: pointer;
  background-color: var(--bg-panel);
  color: var(--text-main);
  border: 1px solid var(--border-color);
}

.btn-plan:hover {
  background-color: rgba(85, 183, 255, 0.15);
  border-color: var(--primary-blue);
  color: #fff;
}

.btn-plan-primary {
  background: linear-gradient(135deg, #46D3B4 0%, #30A8E0 100%);
  color: #08131D;
  border: none;
  box-shadow: 0 4px 14px rgba(70, 211, 180, 0.3);
}

.btn-plan-primary:hover {
  filter: brightness(1.1);
  transform: translateY(-1px);
  box-shadow: 0 6px 18px rgba(70, 211, 180, 0.45);
  color: #08131D;
}

/* Common Network Capabilities */
.plans-network-caps {
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 22px 28px;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.caps-header {
  display: flex;
  align-items: center;
  gap: 10px;
}

.caps-badge {
  font-size: 11px;
  font-weight: 700;
  color: var(--line-cyan);
  background: rgba(70, 211, 180, 0.12);
  padding: 3px 8px;
  border-radius: 4px;
}

.caps-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-main);
}

.caps-tags-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.cap-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--text-body);
  background: var(--bg-panel);
  border: 1px solid var(--border-color);
  padding: 5px 12px;
  border-radius: 6px;
}

.cap-dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--line-cyan);
}

/* Dynamic Multiplier Notice */
.plans-multiplier-notice {
  background: rgba(242, 179, 93, 0.08);
  border: 1px solid rgba(242, 179, 93, 0.25);
  border-left: 4px solid var(--multiplier-orange);
  border-radius: var(--radius-md);
  padding: 14px 20px;
  display: flex;
  align-items: flex-start;
  gap: 14px;
}

.notice-badge {
  font-size: 12px;
  font-weight: 700;
  color: var(--multiplier-orange);
  background: rgba(242, 179, 93, 0.15);
  padding: 2px 8px;
  border-radius: 4px;
  flex-shrink: 0;
  margin-top: 2px;
}

.notice-text {
  font-size: 13px;
  color: var(--text-body);
  line-height: 1.6;
  margin: 0;
}

/* ================= Section 10: Review Summary ================= */
.review-summary-card {
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--line-cyan);
  border-radius: var(--radius-lg);
  padding: 36px 40px;
}

.review-summary-text {
  font-size: 16px;
  color: var(--text-body);
  line-height: 1.8;
  margin-bottom: 24px;
}

.review-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 24px;
}

.review-tag-item {
  font-size: 12px;
  color: var(--text-muted);
  background-color: var(--bg-panel);
  border: 1px solid var(--border-color);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
}

/* ================= Section 11: Article Line Catalog ================= */
.line-catalog-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.line-catalog-item {
  display: grid;
  grid-template-columns: 60px 140px 1fr 140px 120px;
  align-items: center;
  gap: 20px;
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.line-catalog-item:hover {
  transform: translateX(4px);
  border-color: var(--primary-blue);
}

.catalog-index {
  font-family: var(--font-code);
  font-size: 14px;
  font-weight: 700;
  color: var(--primary-blue);
}

.catalog-category {
  font-size: 13px;
  color: var(--line-cyan);
  font-weight: 600;
}

.catalog-main {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.catalog-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-main);
}

.catalog-desc {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.5;
}

.catalog-time {
  font-size: 13px;
  color: var(--text-muted);
  text-align: right;
}

.catalog-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--primary-blue);
  text-align: right;
  display: inline-flex;
  align-items: center;
  justify-content: flex-end;
  gap: 4px;
}

/* ================= Section 12: Network Troubleshooting ================= */
.troubleshooting-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.troubleshoot-node {
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 22px 20px;
}

.troubleshoot-step-num {
  font-family: var(--font-code);
  font-size: 12px;
  font-weight: 700;
  color: var(--primary-blue);
  margin-bottom: 8px;
}

.troubleshoot-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 8px;
}

.troubleshoot-text {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ================= Section 13: FAQ Accordion ================= */
.faq-accordion-wrap {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-width: 920px;
  margin: 0 auto;
}

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

.faq-item.active {
  border-color: var(--primary-blue);
}

.faq-question-btn {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 24px;
  background: transparent;
  border: none;
  cursor: pointer;
  text-align: left;
  color: var(--text-main);
}

.faq-q-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.faq-q-num {
  font-family: var(--font-code);
  font-size: 13px;
  font-weight: 700;
  color: var(--line-cyan);
}

.faq-q-text {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-main);
}

.faq-toggle-icon {
  font-size: 18px;
  color: var(--text-muted);
  transition: transform 0.2s ease;
}

.faq-item.active .faq-toggle-icon {
  transform: rotate(45deg);
  color: var(--primary-blue);
}

.faq-answer-panel {
  display: none;
  padding: 0 24px 20px 54px;
  font-size: 14px;
  color: var(--text-body);
  line-height: 1.7;
}

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

/* ================= Footer ================= */
.site-footer {
  background-color: #060E16;
  border-top: 1px solid var(--border-color);
  padding: 40px 0 24px 0;
  min-height: 250px;
}

.footer-top {
  display: grid;
  grid-template-columns: 1.4fr 1.6fr 1fr;
  gap: 48px;
  margin-bottom: 32px;
}

.footer-brand-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 6px;
}

.footer-brand-sub {
  font-size: 13px;
  color: var(--line-cyan);
  margin-bottom: 12px;
}

.footer-brand-desc {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 18px;
}

.footer-col-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 14px;
  letter-spacing: 0.5px;
}

.footer-links-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px 20px;
}

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

.footer-link {
  font-size: 13px;
  color: var(--text-body);
  transition: color 0.2s ease;
}

.footer-link:hover {
  color: var(--primary-blue);
}

.footer-recom-wrap {
  border-top: 1px solid rgba(140, 180, 200, 0.1);
  padding-top: 20px;
  margin-bottom: 20px;
}

.footer-recom-title {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.footer-recom-links {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}

.footer-recom-link {
  font-size: 13px;
  color: var(--text-body);
}

.footer-recom-link:hover {
  color: var(--line-cyan);
}

.footer-bottom {
  border-top: 1px solid rgba(140, 180, 200, 0.1);
  padding-top: 18px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  color: var(--text-muted);
}

/* ================= Article & Reader Layout ================= */
.article-header {
  padding: 48px 0 32px 0;
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
}

.breadcrumb-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.breadcrumb-sep {
  color: var(--text-muted);
}

.article-title {
  font-size: clamp(26px, 3.2vw, 36px);
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.35;
  margin-bottom: 16px;
}

.article-meta-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 20px;
  font-size: 13px;
  color: var(--text-muted);
}

.meta-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

.article-layout {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 48px;
  padding: 48px 0 80px 0;
}

.article-main-content {
  min-width: 0;
}

/* Quick Conclusion Box (GEO standard) */
.quick-conclusion-box {
  background-color: rgba(70, 211, 180, 0.08);
  border: 1px solid var(--border-cyan);
  border-left: 4px solid var(--line-cyan);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  margin-bottom: 36px;
}

.quick-conclusion-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--line-cyan);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.quick-conclusion-content {
  font-size: 15px;
  color: var(--text-main);
  line-height: 1.7;
}

/* Quote verbatim block */
.quote-verbatim-block {
  background-color: var(--bg-tertiary);
  border-left: 4px solid var(--primary-blue);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 24px 28px;
  margin: 28px 0;
  font-size: 15px;
  color: var(--text-main);
  line-height: 1.8;
}

.quote-verbatim-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--primary-blue);
  margin-bottom: 10px;
  letter-spacing: 0.5px;
}

/* Article Body Typography */
.article-body h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-main);
  margin-top: 40px;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(140, 180, 200, 0.15);
}

.article-body h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-main);
  margin-top: 28px;
  margin-bottom: 12px;
}

.article-body p {
  font-size: 15px;
  color: var(--text-body);
  line-height: 1.8;
  margin-bottom: 18px;
}

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

.article-body ul li {
  list-style: disc;
  font-size: 15px;
  color: var(--text-body);
  line-height: 1.7;
  margin-bottom: 8px;
}

.article-body ol li {
  list-style: decimal;
  font-size: 15px;
  color: var(--text-body);
  line-height: 1.7;
  margin-bottom: 8px;
}

/* HTML Tables in Articles */
.article-table-wrap {
  width: 100%;
  overflow-x: auto;
  margin: 28px 0;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
}

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

.article-table th {
  background-color: var(--bg-tertiary);
  color: var(--text-main);
  font-weight: 600;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border-color);
}

.article-table td {
  padding: 14px 18px;
  border-bottom: 1px solid rgba(140, 180, 200, 0.1);
  color: var(--text-body);
}

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

.article-table tr:hover td {
  background-color: rgba(22, 52, 74, 0.3);
}

/* Sidebar in Article */
.article-sidebar {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.toc-card {
  position: sticky;
  top: 96px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
}

.toc-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(140, 180, 200, 0.15);
}

.toc-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 13px;
  max-height: 480px;
  overflow-y: auto;
}

.toc-link {
  color: var(--text-body);
  transition: color 0.2s ease;
  line-height: 1.4;
}

.toc-link:hover {
  color: var(--primary-blue);
}

/* Category & Sitemap Pages */
.category-header {
  padding: 56px 0 40px 0;
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
}

.category-title {
  font-size: 32px;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 12px;
}

.category-desc {
  font-size: 15px;
  color: var(--text-body);
  max-width: 800px;
  line-height: 1.7;
}

.page-content-wrap {
  padding: 48px 0 80px 0;
}

/* ================= Page & Article Layout Fallbacks ================= */
.page-container {
  min-height: calc(100vh - 72px - 200px);
  padding: 40px 0 80px 0;
}

.content-wrapper {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.breadcrumb a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s ease;
}

.breadcrumb a:hover {
  color: var(--primary-blue);
}

.article-detail {
  width: 100%;
  max-width: 900px;
  margin: 0 auto;
}

.page-title {
  font-size: clamp(26px, 3.2vw, 36px);
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.35;
  margin-bottom: 16px;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  font-size: 13px;
  color: var(--text-muted);
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 32px;
}

.article-meta a {
  color: var(--primary-blue);
}

.article-content {
  font-size: 15px;
  color: var(--text-body);
  line-height: 1.8;
}

.article-content h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-main);
  margin-top: 40px;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(140, 180, 200, 0.15);
}

.article-content h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-main);
  margin-top: 28px;
  margin-bottom: 12px;
}

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

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

.article-content ul li {
  list-style: disc;
  margin-bottom: 8px;
  font-size: 15px;
  color: var(--text-body);
}

.article-content ol li {
  list-style: decimal;
  margin-bottom: 8px;
  font-size: 15px;
  color: var(--text-body);
}

.grid {
  display: grid;
}

.grid-2 {
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

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

.card {
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.badge {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  color: var(--line-cyan);
  background: rgba(70, 211, 180, 0.12);
  border: 1px solid var(--border-cyan);
  padding: 3px 10px;
  border-radius: 4px;
}

.quote-box {
  background: rgba(85, 183, 255, 0.06);
  border-left: 4px solid var(--primary-blue);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 24px 28px;
  margin: 28px 0;
}

.table-responsive {
  width: 100%;
  overflow-x: auto;
  margin: 28px 0;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
}

.table-responsive table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.table-responsive th, .table-responsive td {
  padding: 12px 16px;
}

.table-responsive th {
  background: var(--bg-tertiary);
  color: var(--text-main);
}

.table-responsive td {
  border-bottom: 1px solid rgba(140, 180, 200, 0.1);
  color: var(--text-body);
}

.cta-banner {
  background: linear-gradient(135deg, rgba(22, 52, 74, 0.8) 0%, rgba(16, 35, 51, 0.9) 100%);
  border: 1px solid var(--border-cyan);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  text-align: center;
  margin-top: 48px;
}

.cta-banner h3 {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 10px;
}

.cta-banner p {
  font-size: 15px;
  color: var(--text-body);
  max-width: 600px;
  margin: 0 auto 24px;
}

.cta-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.footer-container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding: 32px 24px 24px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 32px;
  margin-bottom: 32px;
}

.footer-brand .brand-logo {
  margin-bottom: 12px;
}

.footer-brand .brand-desc {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
}

.footer-col h4 {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 16px;
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-col ul li a {
  font-size: 13px;
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s ease;
}

.footer-col ul li a:hover {
  color: var(--primary-blue);
}

/* ================= Animations ================= */
@keyframes pulse-dot {
  0% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.3); opacity: 0.6; }
  100% { transform: scale(1); opacity: 1; }
}

@keyframes line-glow {
  0% { stroke-dashoffset: 60; opacity: 0.4; }
  50% { stroke-dashoffset: 0; opacity: 1; }
  100% { stroke-dashoffset: -60; opacity: 0.4; }
}

.animated-line {
  stroke-dasharray: 8 16;
  animation: line-glow 6s linear infinite;
}

/* ================= Prefers Reduced Motion ================= */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  
  .animated-line {
    animation: none;
    stroke-dasharray: none;
  }
  
  .hero-tag-dot {
    animation: none;
  }
}

/* ================= Responsive Breakpoints ================= */

/* 1024px */
@media (max-width: 1024px) {
  .header-nav {
    display: none;
  }
  
  .mobile-menu-toggle {
    display: block;
  }
  
  .orchestration-grid {
    grid-template-columns: 1fr;
  }
  
  .isp-row {
    grid-template-columns: 160px 40px 1fr 160px;
    gap: 12px;
    padding: 16px;
  }
  
  .feature-asymmetric {
    grid-template-columns: 1fr;
  }
  
  .lb-flow-container {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  
  .lb-arrow-col {
    transform: rotate(90deg);
  }
  
  .ingress-bus-rail {
    display: none;
  }
  
  .plans-flow-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .plan-tier-03 {
    grid-column: span 2;
  }
  
  .line-catalog-item {
    grid-template-columns: 40px 1fr 100px;
    gap: 12px;
  }
  
  .catalog-category {
    display: none;
  }
  
  .catalog-time {
    display: none;
  }
  
  .troubleshooting-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .article-layout {
    grid-template-columns: 1fr;
  }
  
  .toc-card {
    position: static;
  }
  
  .footer-top {
    grid-template-columns: 1fr;
    gap: 32px;
  }
}

/* 768px */
@media (max-width: 768px) {
  .hero-section {
    padding-top: 36px;
    padding-bottom: 44px;
    min-height: auto;
  }
  
  .network-diagram-desktop {
    display: none;
  }
  
  .network-diagram-mobile {
    display: block;
    width: 100%;
    height: auto;
  }
  
  .isp-row {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .isp-meta {
    justify-content: center;
  }
  
  .isp-arrow {
    transform: rotate(90deg);
    margin: 4px 0;
  }
  
  .multiplier-item {
    grid-template-columns: 1fr;
    gap: 12px;
  }
  
  .multiplier-scene {
    text-align: left;
  }
  
  .client-compare-strip {
    grid-template-columns: 1fr;
  }
  
  .plans-quick-guide {
    padding: 12px 16px;
    border-radius: var(--radius-md);
    flex-direction: column;
    gap: 8px;
    align-items: flex-start;
  }
  
  .quick-guide-divider {
    display: none;
  }
  
  .plans-flow-grid {
    display: flex;
    flex-direction: column;
    gap: 16px;
  }
  
  /* Mobile Order: 进阶(主力推荐) -> 轻享 -> 标准 -> 大流量 -> 年付备用 */
  .plan-tier-03 { order: 1; }
  .plan-tier-01 { order: 2; }
  .plan-tier-02 { order: 3; }
  .plan-tier-04 { order: 4; }
  .plan-tier-05 { order: 5; }
  
  .plans-network-caps {
    flex-direction: column;
    align-items: flex-start;
    padding: 16px;
  }
  
  .plans-multiplier-notice {
    flex-direction: column;
    gap: 8px;
  }
  
  .troubleshooting-grid {
    grid-template-columns: 1fr;
  }
  
  .main-nav {
    display: none;
  }
  
  .menu-toggle {
    display: flex;
    flex-direction: column;
    justify-content: space-around;
    width: 32px;
    height: 32px;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 6px;
    cursor: pointer;
  }
  
  .menu-toggle .hamburger,
  .menu-toggle span {
    display: block;
    width: 100%;
    height: 2px;
    background-color: var(--text-main);
  }
  
  .main-nav.active {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 24px;
    gap: 16px;
    z-index: 999;
  }
  
  .nav-links {
    flex-direction: column;
    width: 100%;
    gap: 14px;
    align-items: flex-start;
  }
  
  .nav-actions {
    width: 100%;
    margin-left: 0;
  }
  
  .nav-actions .btn {
    width: 100%;
  }
  
  .grid-2, .grid-3 {
    grid-template-columns: 1fr;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
  }
}

/* 430px, 390px, 375px (Mobile Edge) */
@media (max-width: 430px) {
  .container {
    padding-left: 16px;
    padding-right: 16px;
  }
  
  .site-header {
    height: 64px;
  }
  
  .header-inner {
    height: 64px;
  }
  
  .mobile-menu-panel {
    top: 64px;
  }
  
  .hero-brand {
    font-size: 42px;
  }
  
  .hero-slogan {
    font-size: 38px;
  }
  
  .hero-h1 {
    font-size: 20px;
  }
  
  .hero-actions {
    flex-direction: column;
    width: 100%;
  }
  
  .hero-actions .btn-cta, .hero-actions .btn-secondary {
    width: 100%;
  }
  
  .line-catalog-item {
    grid-template-columns: 1fr;
    gap: 10px;
  }
  
  .catalog-link {
    text-align: left;
    justify-content: flex-start;
  }
  
  .footer-bottom {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }
}