/* ==================================================
   气泡云 第3套 - 气泡信号实验室 (style.css)
   ================================================== */

:root {
  --bg: #11181C;
  --bg-secondary: #182126;
  --surface: #202A30;
  --surface-raised: #243138;
  --text: #F1F5F5;
  --text-body: #BAC6C9;
  --muted: #87979C;
  --deep-cyan: #355C63;
  --tech-cyan: #58A2A6;
  --tech-cyan-soft: #89C7C7;
  --cyan-gray: #53747B;
  --mist-green: #719A86;
  --mist-green-soft: #92BA9F;
  --bubble-blue: #6A8FA5;
  --deep-bubble-blue: #506F82;
  --copper: #C18A5C;
  --copper-light: #D7A982;
  --error-muted: #9A666B;
  --error-dark: #774E53;
  --border: #304047;
  --border-light: #41545C;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
  --container-max: 1200px;
}

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

html {
  font-family: var(--font-sans);
  background-color: var(--bg);
  color: var(--text-body);
  line-height: 1.75;
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  overflow-x: hidden;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: var(--tech-cyan-soft);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--tech-cyan);
}

a:focus-visible, button:focus-visible, input:focus-visible {
  outline: 2px solid var(--tech-cyan-soft);
  outline-offset: 3px;
}

h1, h2, h3, h4, h5, h6 {
  color: var(--text);
  font-weight: 700;
  line-height: 1.3;
}

h1 {
  font-size: clamp(32px, 5vw, 56px);
  margin-bottom: 20px;
}

h2 {
  font-size: clamp(24px, 3.5vw, 36px);
  margin-bottom: 16px;
  letter-spacing: -0.01em;
}

h3 {
  font-size: clamp(18px, 2.5vw, 24px);
  margin-bottom: 12px;
}

p {
  margin-bottom: 16px;
}

p:last-child {
  margin-bottom: 0;
}

ul, ol {
  padding-left: 24px;
  margin-bottom: 16px;
}

li {
  margin-bottom: 8px;
}

code {
  font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace;
  background-color: var(--surface);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.9em;
  color: var(--tech-cyan-soft);
  border: 1px solid var(--border);
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  height: 72px;
  background-color: rgba(17, 24, 28, 0.94);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  z-index: 100;
  display: flex;
  align-items: center;
}

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

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

.logo-svg {
  width: 38px;
  height: 38px;
  display: block;
}

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

.brand-name {
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
  line-height: 1.1;
  letter-spacing: 0.05em;
}

.brand-subtitle {
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 0.02em;
}

.nav-desktop {
  display: flex;
  align-items: center;
  gap: 16px;
}

.nav-link {
  font-size: 14px;
  color: var(--text-body);
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 4px;
  transition: color 0.2s;
}

.nav-link:hover {
  color: var(--tech-cyan-soft);
}

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

.nav-signal-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: var(--tech-cyan-soft);
  display: inline-block;
}

.header-cta {
  background-color: var(--surface-raised);
  color: var(--tech-cyan-soft);
  border: 1px solid var(--tech-cyan);
  padding: 8px 18px;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s ease;
}

.header-cta:hover {
  background-color: var(--deep-cyan);
  color: var(--text);
  border-color: var(--tech-cyan-soft);
  transform: translateY(-1px);
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 8px 12px;
  border-radius: 6px;
  cursor: pointer;
}

.mobile-nav {
  display: none;
  position: absolute;
  top: 72px;
  left: 0;
  width: 100%;
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  padding: 16px 24px;
  flex-direction: column;
  gap: 12px;
  z-index: 99;
}

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

.mobile-nav-link {
  color: var(--text-body);
  padding: 8px 0;
  font-size: 15px;
  border-bottom: 1px solid rgba(48, 64, 71, 0.4);
}

.mobile-nav-link:last-child {
  border-bottom: none;
}

/* Hero Section */
.hero-section {
  position: relative;
  padding: 60px 0 80px 0;
  background-color: var(--bg);
  background-image: radial-gradient(circle at 50% 30%, rgba(53, 92, 99, 0.12) 0%, transparent 70%);
  border-bottom: 1px solid var(--border);
  overflow: hidden;
}

.hero-header-box {
  text-align: center;
  max-width: 820px;
  margin: 0 auto 50px auto;
  position: relative;
  z-index: 2;
}

.hero-tagline {
  display: inline-block;
  color: var(--copper-light);
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.08em;
  margin-bottom: 16px;
  background: rgba(193, 138, 92, 0.1);
  border: 1px solid rgba(193, 138, 92, 0.3);
  padding: 4px 16px;
  border-radius: 20px;
}

.hero-title {
  color: var(--text);
  font-size: clamp(32px, 4.5vw, 52px);
  line-height: 1.25;
  margin-bottom: 20px;
}

.hero-body {
  font-size: 17px;
  color: var(--text-body);
  line-height: 1.8;
  margin-bottom: 32px;
}

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

.btn-primary {
  background-color: var(--tech-cyan);
  color: #0c1417;
  font-weight: 700;
  padding: 12px 28px;
  border-radius: 6px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: all 0.2s ease;
}

.btn-primary:hover {
  background-color: var(--tech-cyan-soft);
  color: #000;
  transform: translateY(-2px);
}

.btn-secondary {
  background-color: var(--surface);
  color: var(--text);
  border: 1px solid var(--border-light);
  padding: 12px 24px;
  border-radius: 6px;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: all 0.2s ease;
}

.btn-secondary:hover {
  background-color: var(--surface-raised);
  border-color: var(--tech-cyan);
  color: var(--tech-cyan-soft);
  transform: translateY(-2px);
}

.btn-link {
  color: var(--mist-green-soft);
  font-weight: 600;
  padding: 12px 16px;
}

.btn-link:hover {
  color: var(--text);
  text-decoration: underline;
}

/* Hero Signal Bubbles Display */
.hero-bubbles-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 20px;
  position: relative;
  margin-top: 40px;
  z-index: 2;
}

.signal-bubble {
  background-color: var(--surface);
  border: 1px solid var(--border);
  padding: 24px;
  border-radius: 12px;
  position: relative;
  transition: transform 0.3s ease, border-color 0.3s ease;
  display: flex;
  flex-direction: column;
}

.signal-bubble:hover {
  transform: translateY(-3px);
  border-color: var(--tech-cyan);
}

.bubble-badge {
  font-size: 12px;
  font-weight: 700;
  color: var(--muted);
  letter-spacing: 0.05em;
  margin-bottom: 8px;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 8px;
}

.bubble-badge::before {
  content: '';
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--tech-cyan);
}

.bubble-title {
  font-size: 20px;
  color: var(--text);
  margin-bottom: 10px;
}

.bubble-quickcheck {
  font-size: 14px;
  color: var(--text-body);
  line-height: 1.6;
  margin-bottom: 16px;
  flex-grow: 1;
}

.bubble-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--tech-cyan-soft);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

/* Shapes for specific hero bubbles */
.shape-node { border-left: 4px solid var(--tech-cyan); }
.shape-clash { border-left: 4px solid var(--bubble-blue); }
.shape-dns { border-left: 4px solid var(--mist-green); }
.shape-ai { border-left: 4px solid var(--copper); }
.shape-stream { border-left: 4px solid var(--tech-cyan-soft); }
.shape-device { border-left: 4px solid var(--cyan-gray); }

/* Main Section Styling */
.section {
  padding: 70px 0;
  border-bottom: 1px solid var(--border);
  position: relative;
}

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

.section-label {
  font-size: 13px;
  font-weight: 700;
  color: var(--tech-cyan);
  letter-spacing: 0.1em;
  margin-bottom: 10px;
  display: block;
}

.section-h2 {
  font-size: clamp(24px, 3.5vw, 36px);
  color: var(--text);
  margin-bottom: 20px;
}

.direct-answer-box {
  background-color: var(--surface);
  border-left: 3px solid var(--tech-cyan);
  padding: 20px 24px;
  border-radius: 0 8px 8px 0;
  margin-bottom: 32px;
  font-size: 17px;
  color: var(--text);
  line-height: 1.8;
}

.direct-answer-box p {
  margin: 0;
}

/* Section 01: Six Troubleshooting Bands */
.trouble-bands {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.trouble-band-item {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px 20px;
  display: flex;
  align-items: center;
  gap: 20px;
}

.band-step {
  font-size: 14px;
  font-weight: 700;
  color: var(--tech-cyan-soft);
  background-color: var(--surface-raised);
  padding: 4px 12px;
  border-radius: 4px;
  border: 1px solid var(--border-light);
  white-space: nowrap;
}

.band-content {
  flex: 1;
}

.band-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 4px;
}

.band-desc {
  font-size: 14px;
  color: var(--text-body);
  margin: 0;
}

/* Section 02: Two Adjacent Node Bubbles */
.node-comparison-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.node-comp-card {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 24px;
}

.node-comp-card.normal {
  border-top: 3px solid var(--cyan-gray);
}

.node-comp-card.abnormal {
  border-top: 3px solid var(--error-muted);
}

.comp-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.comp-status-tag {
  font-size: 12px;
  padding: 3px 10px;
  border-radius: 12px;
  font-weight: 600;
}

.comp-status-tag.normal-tag {
  background-color: rgba(83, 116, 123, 0.2);
  color: var(--tech-cyan-soft);
  border: 1px solid var(--cyan-gray);
}

.comp-status-tag.abnormal-tag {
  background-color: rgba(154, 102, 107, 0.2);
  color: #DDAAA6;
  border: 1px solid var(--error-muted);
}

/* Section 03: Disconnected Arc Visual */
.connected-broken-visual {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  background-color: var(--surface);
  border: 1px solid var(--border);
  padding: 30px;
  border-radius: 12px;
  margin-bottom: 32px;
}

.visual-node {
  flex: 1;
  background-color: var(--surface-raised);
  padding: 20px;
  border-radius: 8px;
  border: 1px solid var(--border-light);
  text-align: center;
}

.visual-arc {
  display: flex;
  flex-direction: column;
  align-items: center;
  color: var(--copper);
}

.arc-symbol {
  font-size: 24px;
  font-weight: 700;
}

.arc-text {
  font-size: 12px;
  color: var(--muted);
  white-space: nowrap;
}

/* Section 04 & 05: Platform Clusters */
.platform-cluster-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}

.platform-card {
  background-color: var(--surface);
  border: 1px solid var(--border);
  padding: 20px;
  border-radius: 8px;
}

.platform-card h3 {
  color: var(--tech-cyan-soft);
  font-size: 18px;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Section 06: Clash Core Bubble Layout */
.clash-core-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 24px;
}

.clash-main-card {
  background-color: var(--surface-raised);
  border: 1px solid var(--bubble-blue);
  padding: 28px;
  border-radius: 12px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.clash-sub-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
}

.clash-sub-item {
  background-color: var(--surface);
  border: 1px solid var(--border);
  padding: 16px;
  border-radius: 8px;
}

.clash-sub-item h4 {
  color: var(--text);
  margin-bottom: 6px;
  font-size: 15px;
}

/* Section 07: Three Non-Fusing Bubbles */
.tri-bubbles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.tri-bubble-card {
  background-color: var(--surface);
  border-radius: 12px;
  padding: 24px;
}

.tri-bubble-card.dns-card { border-top: 4px solid var(--tech-cyan); }
.tri-bubble-card.proxy-card { border-top: 4px solid var(--bubble-blue); }
.tri-bubble-card.perm-card { border-top: 4px solid var(--mist-green); }

/* Line Check Table */
.tech-table-wrapper {
  width: 100%;
  overflow-x: auto;
  margin-bottom: 24px;
  border: 1px solid var(--border);
  border-radius: 8px;
}

.tech-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 15px;
}

.tech-table th {
  background-color: var(--surface-raised);
  color: var(--tech-cyan-soft);
  padding: 14px 18px;
  font-weight: 700;
  border-bottom: 1px solid var(--border);
}

.tech-table td {
  padding: 14px 18px;
  border-bottom: 1px solid rgba(48, 64, 71, 0.5);
  background-color: var(--surface);
  color: var(--text-body);
}

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

/* Section 13: Diagnostics Completed Pricing Layout */
.pricing-diag-header {
  background-color: var(--surface-raised);
  border: 1px solid var(--tech-cyan);
  border-radius: 8px;
  padding: 18px 24px;
  text-align: center;
  margin-bottom: 32px;
}

.diag-status-text {
  font-size: 18px;
  font-weight: 700;
  color: var(--mist-green-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
}

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

.plan-row-card {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  transition: border-color 0.2s;
}

.plan-row-card:hover {
  border-color: var(--border-light);
}

.plan-row-card.recommended-plan {
  background-color: var(--surface-raised);
  border: 2px solid var(--tech-cyan);
  position: relative;
}

.recommended-tag {
  position: absolute;
  top: -12px;
  right: 24px;
  background-color: var(--copper);
  color: #fff;
  font-size: 12px;
  font-weight: 700;
  padding: 2px 10px;
  border-radius: 4px;
}

.plan-intent {
  display: flex;
  align-items: center;
  gap: 14px;
  flex: 2;
}

.intent-bubble {
  background-color: var(--bg-secondary);
  color: var(--tech-cyan-soft);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  border: 1px solid var(--border);
  white-space: nowrap;
}

.plan-details {
  flex: 2;
}

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

.plan-spec {
  font-size: 14px;
  color: var(--muted);
}

.plan-price-action {
  display: flex;
  align-items: center;
  gap: 20px;
  flex: 1;
  justify-content: flex-end;
}

.plan-price {
  font-size: 24px;
  font-weight: 700;
  color: var(--text);
  white-space: nowrap;
}

.plan-cta-btn {
  background-color: var(--tech-cyan);
  color: #0d1418;
  padding: 8px 18px;
  border-radius: 6px;
  font-weight: 700;
  font-size: 14px;
  white-space: nowrap;
}

.plan-cta-btn:hover {
  background-color: var(--tech-cyan-soft);
}

/* Section 14: Articles Index */
.articles-group-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 24px;
}

.article-group-card {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 24px;
}

.article-group-title {
  font-size: 18px;
  color: var(--text);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 8px;
}

.article-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.article-list li {
  margin-bottom: 12px;
}

.article-list a {
  color: var(--text-body);
  font-size: 15px;
  display: block;
  line-height: 1.5;
}

.article-list a:hover {
  color: var(--tech-cyan-soft);
}

.article-meta-mini {
  font-size: 12px;
  color: var(--muted);
  margin-top: 2px;
}

/* Section 15: FAQ Accordion */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}

.faq-question-btn {
  width: 100%;
  background: none;
  border: none;
  padding: 18px 24px;
  text-align: left;
  color: var(--text);
  font-size: 16px;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  font-family: inherit;
}

.faq-icon-bubble {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--tech-cyan);
  margin-right: 12px;
  display: inline-block;
}

.faq-toggle-plus {
  font-size: 20px;
  color: var(--muted);
  transition: transform 0.2s;
}

.faq-answer {
  background-color: var(--surface-raised);
  border-left: 3px solid var(--tech-cyan);
  padding: 18px 24px;
  font-size: 15px;
  color: var(--text-body);
  line-height: 1.7;
}

/* Category & Article Page Layouts */
.page-header-box {
  padding: 50px 0 30px 0;
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
}

.breadcrumb {
  font-size: 14px;
  color: var(--muted);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

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

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

.article-layout {
  display: grid;
  grid-template-columns: 1fr 260px;
  gap: 40px;
  padding: 50px 0;
}

.article-main-content {
  max-width: 800px;
}

.quick-conclusion-box {
  background-color: var(--surface);
  border-left: 3px solid var(--tech-cyan);
  border-radius: 0 8px 8px 0;
  padding: 24px;
  margin-bottom: 32px;
  position: relative;
}

.quick-conclusion-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--tech-cyan-soft);
  margin-bottom: 8px;
}

.article-sidebar {
  position: sticky;
  top: 100px;
  height: fit-content;
}

.toc-card {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px;
}

.toc-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 12px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 6px;
}

.toc-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.toc-list li {
  margin-bottom: 8px;
}

.toc-list a {
  font-size: 13px;
  color: var(--muted);
}

.toc-list a:hover {
  color: var(--tech-cyan-soft);
}

/* Footer */
.site-footer {
  background-color: #0D1418;
  border-top: 1px solid var(--border);
  color: #EEF3F3;
  padding: 60px 0 30px 0;
  margin-top: auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr) 1.5fr;
  gap: 32px;
  margin-bottom: 40px;
}

.footer-col h4 {
  color: var(--text);
  font-size: 15px;
  margin-bottom: 16px;
  position: relative;
  padding-bottom: 6px;
}

.footer-col h4::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 24px;
  height: 2px;
  background-color: var(--tech-cyan);
}

.footer-col ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-col li {
  margin-bottom: 10px;
}

.footer-col a {
  color: #97A8AD;
  font-size: 14px;
}

.footer-col a:hover {
  color: var(--tech-cyan-soft);
}

.friendship-links {
  border-top: 1px solid rgba(48, 64, 71, 0.6);
  padding-top: 24px;
  margin-bottom: 24px;
}

.friendship-title {
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 12px;
  font-weight: 600;
}

.friendship-items {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.friendship-items a {
  color: #97A8AD;
  font-size: 13px;
}

.friendship-items a:hover {
  color: var(--tech-cyan-soft);
}

.footer-bottom {
  border-top: 1px solid rgba(48, 64, 71, 0.6);
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
  color: var(--muted);
}

/* Animations & Motion */
@keyframes bubbleFloat {
  0% { transform: translateY(0px); opacity: 0.88; }
  100% { transform: translateY(-3px); opacity: 1; }
}

@media (prefers-reduced-motion: reduce) {
  *, ::before, ::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* Responsive Media Queries */
@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .article-layout {
    grid-template-columns: 1fr;
  }
  .article-sidebar {
    display: none;
  }
  .tri-bubbles-grid {
    grid-template-columns: 1fr;
  }
  .clash-core-layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .nav-desktop {
    display: none;
  }
  .mobile-menu-btn {
    display: block;
  }
  .hero-bubbles-container {
    grid-template-columns: 1fr;
  }
  .node-comparison-grid {
    grid-template-columns: 1fr;
  }
  .plan-row-card {
    flex-direction: column;
    align-items: flex-start;
  }
  .plan-price-action {
    width: 100%;
    justify-content: space-between;
  }
  .connected-broken-visual {
    flex-direction: column;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 12px;
    align-items: flex-start;
  }
  /* Convert tech table to block cards on mobile */
  .tech-table, .tech-table tbody, .tech-table tr, .tech-table td {
    display: block;
    width: 100%;
  }
  .tech-table<thead> { display: none; }
  .tech-table tr {
    margin-bottom: 16px;
    border: 1px solid var(--border);
    border-radius: 8px;
  }
  .tech-table td {
    border-bottom: 1px solid var(--border);
    padding: 10px 14px;
  }
}

@media (max-width: 430px) {
  .container {
    padding: 0 16px;
  }
  .hero-title {
    font-size: 26px;
  }
  .hero-body {
    font-size: 15px;
  }
  .section-h2 {
    font-size: 22px;
  }
}