/* ==========================================================================
   悠兔机场 (Youtu Airport) - Main Theme & Style System
   Supports: 4 Dynamic Themes, Glassmorphism, Responsive Grid, Smooth Animations
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Theme Variables
   -------------------------------------------------------------------------- */
:root, [data-theme="cyber-purple"] {
  --bg-dark: #0b071a;
  --bg-card: rgba(23, 15, 42, 0.75);
  --bg-card-hover: rgba(35, 23, 64, 0.85);
  --glass-border: rgba(168, 85, 247, 0.25);
  --glass-border-hover: rgba(236, 72, 153, 0.5);
  --primary: #a855f7;
  --primary-glow: rgba(168, 85, 247, 0.4);
  --accent: #ec4899;
  --accent-glow: rgba(236, 72, 153, 0.4);
  --text-main: #f3f4f6;
  --text-muted: #9ca3af;
  --nav-bg: rgba(11, 7, 26, 0.85);
  --badge-bg: rgba(168, 85, 247, 0.15);
  --gradient-btn: linear-gradient(135deg, #a855f7 0%, #ec4899 100%);
  --gradient-text: linear-gradient(135deg, #c084fc 0%, #f472b6 100%);
}

[data-theme="emerald-gold"] {
  --bg-dark: #061712;
  --bg-card: rgba(12, 36, 28, 0.75);
  --bg-card-hover: rgba(19, 54, 42, 0.85);
  --glass-border: rgba(16, 185, 129, 0.25);
  --glass-border-hover: rgba(245, 158, 11, 0.5);
  --primary: #10b981;
  --primary-glow: rgba(16, 185, 129, 0.4);
  --accent: #f59e0b;
  --accent-glow: rgba(245, 158, 11, 0.4);
  --text-main: #f0fdf4;
  --text-muted: #94a3b8;
  --nav-bg: rgba(6, 23, 18, 0.85);
  --badge-bg: rgba(16, 185, 129, 0.15);
  --gradient-btn: linear-gradient(135deg, #10b981 0%, #f59e0b 100%);
  --gradient-text: linear-gradient(135deg, #34d399 0%, #fbbf24 100%);
}

[data-theme="ocean-cyan"] {
  --bg-dark: #051329;
  --bg-card: rgba(10, 29, 61, 0.75);
  --bg-card-hover: rgba(17, 45, 92, 0.85);
  --glass-border: rgba(6, 182, 212, 0.25);
  --glass-border-hover: rgba(59, 130, 246, 0.5);
  --primary: #06b6d4;
  --primary-glow: rgba(6, 182, 212, 0.4);
  --accent: #3b82f6;
  --accent-glow: rgba(59, 130, 246, 0.4);
  --text-main: #f0f9ff;
  --text-muted: #94a3b8;
  --nav-bg: rgba(5, 19, 41, 0.85);
  --badge-bg: rgba(6, 182, 212, 0.15);
  --gradient-btn: linear-gradient(135deg, #06b6d4 0%, #3b82f6 100%);
  --gradient-text: linear-gradient(135deg, #22d3ee 0%, #60a5fa 100%);
}

[data-theme="sunset-amber"] {
  --bg-dark: #1f0b09;
  --bg-card: rgba(43, 16, 14, 0.75);
  --bg-card-hover: rgba(66, 24, 20, 0.85);
  --glass-border: rgba(249, 115, 22, 0.25);
  --glass-border-hover: rgba(239, 68, 68, 0.5);
  --primary: #f97316;
  --primary-glow: rgba(249, 115, 22, 0.4);
  --accent: #ef4444;
  --accent-glow: rgba(239, 68, 68, 0.4);
  --text-main: #fff7ed;
  --text-muted: #a8a29e;
  --nav-bg: rgba(31, 11, 9, 0.85);
  --badge-bg: rgba(249, 115, 22, 0.15);
  --gradient-btn: linear-gradient(135deg, #f97316 0%, #ef4444 100%);
  --gradient-text: linear-gradient(135deg, #fb923c 0%, #f87171 100%);
}

/* --------------------------------------------------------------------------
   2. Reset & Base Layout
   -------------------------------------------------------------------------- */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-dark);
  color: var(--text-main);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
}

/* Canvas Background */
#bg-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -1;
  pointer-events: none;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: all 0.3s ease;
}

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

.text-gradient {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* --------------------------------------------------------------------------
   3. Top Banner & Header Navigation
   -------------------------------------------------------------------------- */
.top-announcement {
  background: var(--gradient-btn);
  color: #fff;
  text-align: center;
  padding: 8px 15px;
  font-size: 14px;
  font-weight: 500;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 10px;
}

.top-announcement .badge {
  background: rgba(255, 255, 255, 0.25);
  padding: 2px 8px;
  border-radius: 20px;
  font-size: 12px;
}

.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--nav-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--glass-border);
  transition: all 0.3s ease;
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 70px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 22px;
  font-weight: 700;
  color: #fff;
}

.logo-icon {
  width: 38px;
  height: 38px;
  background: var(--gradient-btn);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  box-shadow: 0 0 15px var(--primary-glow);
}

.nav-links {
  display: flex;
  gap: 25px;
  list-style: none;
}

.nav-links a {
  color: var(--text-main);
  font-size: 15px;
  font-weight: 500;
  position: relative;
  padding: 5px 0;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background: var(--gradient-btn);
  transition: width 0.3s ease;
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 15px;
}

.theme-selector {
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  color: var(--text-main);
  padding: 6px 12px;
  border-radius: 20px;
  font-size: 13px;
  cursor: pointer;
  outline: none;
}

.theme-selector option {
  background: var(--bg-dark);
  color: #fff;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: 30px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  text-decoration: none;
}

.btn-primary {
  background: var(--gradient-btn);
  color: #fff;
  box-shadow: 0 4px 20px var(--primary-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--accent-glow);
  color: #fff;
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-main);
  border: 1px solid var(--glass-border);
}

.btn-secondary:hover {
  border-color: var(--primary);
  background: var(--bg-card-hover);
  color: #fff;
}

.btn-lg {
  padding: 14px 34px;
  font-size: 17px;
  border-radius: 35px;
}

/* --------------------------------------------------------------------------
   4. Hero Section
   -------------------------------------------------------------------------- */
.hero {
  padding: 90px 0 60px 0;
  text-align: center;
  position: relative;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--badge-bg);
  border: 1px solid var(--glass-border);
  color: var(--primary);
  padding: 6px 18px;
  border-radius: 30px;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 25px;
}

.hero-title {
  font-size: 52px;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 20px;
  letter-spacing: -1px;
}

.hero-subtitle {
  font-size: 20px;
  color: var(--text-muted);
  max-width: 800px;
  margin: 0 auto 40px auto;
}

.hero-btns {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin-bottom: 50px;
  flex-wrap: wrap;
}

.hero-features-bar {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  margin-top: 40px;
}

.feature-pill {
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  padding: 18px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  gap: 14px;
  backdrop-filter: blur(10px);
  text-align: left;
}

.feature-pill-icon {
  font-size: 28px;
}

.feature-pill-title {
  font-size: 16px;
  font-weight: 700;
}

.feature-pill-desc {
  font-size: 13px;
  color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   5. Section Common Styles
   -------------------------------------------------------------------------- */
.section {
  padding: 80px 0;
  position: relative;
}

.section-header {
  text-align: center;
  margin-bottom: 50px;
}

.section-subtitle {
  color: var(--primary);
  font-size: 14px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 8px;
}

.section-title {
  font-size: 38px;
  font-weight: 800;
}

.section-desc {
  color: var(--text-muted);
  font-size: 16px;
  max-width: 650px;
  margin: 10px auto 0 auto;
}

/* --------------------------------------------------------------------------
   6. Section 3: Node Latency & Status Board (节点延迟和状态)
   -------------------------------------------------------------------------- */
.node-board {
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  border-radius: 24px;
  padding: 30px;
  backdrop-filter: blur(15px);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
}

.node-board-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 25px;
  flex-wrap: wrap;
  gap: 15px;
}

.node-summary {
  display: flex;
  gap: 20px;
}

.node-stat-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
}

.status-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #10b981;
  box-shadow: 0 0 10px #10b981;
}

.node-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
  gap: 18px;
}

.node-card {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 16px;
  padding: 18px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: all 0.3s ease;
}

.node-card:hover {
  border-color: var(--glass-border-hover);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
}

.node-info {
  display: flex;
  align-items: center;
  gap: 12px;
}

.node-flag {
  font-size: 24px;
}

.node-name {
  font-size: 15px;
  font-weight: 700;
}

.node-tag {
  font-size: 12px;
  color: var(--text-muted);
}

.node-ping {
  text-align: right;
}

.ping-val {
  font-size: 16px;
  font-weight: 800;
  color: #10b981;
}

.ping-val.medium {
  color: #f59e0b;
}

.ping-status {
  font-size: 11px;
  color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   7. Section 4: Core Advantages & Pricing Grid (核心优势与套餐价格)
   -------------------------------------------------------------------------- */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 25px;
  margin-bottom: 60px;
}

.adv-box {
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  padding: 30px;
  transition: all 0.3s ease;
  backdrop-filter: blur(12px);
}

.adv-box:hover {
  border-color: var(--glass-border-hover);
  transform: translateY(-5px);
  box-shadow: 0 12px 35px var(--primary-glow);
}

.adv-icon {
  width: 55px;
  height: 55px;
  background: var(--badge-bg);
  border: 1px solid var(--glass-border);
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  margin-bottom: 20px;
  color: var(--primary);
}

.adv-title {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 10px;
}

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

/* Pricing Grid */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 25px;
  align-items: stretch;
}

.price-card {
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  border-radius: 24px;
  padding: 35px 25px;
  display: flex;
  flex-direction: column;
  position: relative;
  backdrop-filter: blur(12px);
  transition: all 0.3s ease;
}

.price-card:hover {
  border-color: var(--glass-border-hover);
  transform: translateY(-6px);
  box-shadow: 0 15px 40px var(--primary-glow);
}

.price-card.popular {
  border: 2px solid var(--primary);
  box-shadow: 0 0 30px var(--primary-glow);
}

.popular-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gradient-btn);
  color: #fff;
  padding: 4px 16px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1px;
}

.price-header {
  text-align: center;
  margin-bottom: 25px;
}

.price-title {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 10px;
}

.price-val {
  font-size: 42px;
  font-weight: 900;
  color: var(--text-main);
}

.price-val span {
  font-size: 16px;
  color: var(--text-muted);
  font-weight: 400;
}

.price-features {
  list-style: none;
  margin-bottom: 30px;
  flex-grow: 1;
}

.price-features li {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
  font-size: 14px;
  color: var(--text-main);
}

.price-features li::before {
  content: '✓';
  color: var(--primary);
  font-weight: bold;
}

/* --------------------------------------------------------------------------
   8. Section 5: FAQ & Knowledge Base (常见问题 & 知识库教程)
   -------------------------------------------------------------------------- */
.faq-list {
  max-width: 850px;
  margin: 0 auto 70px auto;
  display: flex;
  flex-direction: column;
  gap: 15px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  overflow: hidden;
  transition: all 0.3s ease;
}

.faq-question {
  padding: 20px 25px;
  font-size: 17px;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-answer {
  padding: 0 25px 20px 25px;
  color: var(--text-muted);
  font-size: 15px;
  display: none;
  line-height: 1.7;
}

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

.faq-item.active .faq-toggle-icon {
  transform: rotate(180deg);
}

.faq-toggle-icon {
  transition: transform 0.3s ease;
  color: var(--primary);
}

/* Knowledge Base Grid */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 25px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  padding: 25px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.3s ease;
  backdrop-filter: blur(12px);
}

.article-card:hover {
  border-color: var(--glass-border-hover);
  transform: translateY(-5px);
  box-shadow: 0 10px 30px var(--primary-glow);
}

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

.article-tag {
  background: var(--badge-bg);
  color: var(--primary);
  padding: 4px 10px;
  border-radius: 12px;
  font-weight: 600;
}

.article-time {
  color: var(--text-muted);
}

.article-card-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 12px;
  line-height: 1.4;
}

.article-card-title a {
  color: var(--text-main);
}

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

.article-summary {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 20px;
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 15px;
}

.article-link {
  font-size: 14px;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

/* --------------------------------------------------------------------------
   9. Section 6: User Testimonials (用户评价板块)
   -------------------------------------------------------------------------- */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 25px;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  padding: 25px;
  backdrop-filter: blur(12px);
}

.review-header {
  display: flex;
  align-items: center;
  gap: 15px;
  margin-bottom: 15px;
}

.review-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--gradient-btn);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 18px;
  color: #fff;
}

.review-user-name {
  font-size: 16px;
  font-weight: 700;
}

.review-user-role {
  font-size: 12px;
  color: var(--text-muted);
}

.review-stars {
  color: #f59e0b;
  margin-bottom: 10px;
}

.review-content {
  font-size: 14px;
  color: var(--text-main);
  line-height: 1.6;
}

/* --------------------------------------------------------------------------
   10. Footer Section
   -------------------------------------------------------------------------- */
.footer {
  border-top: 1px solid var(--glass-border);
  background: rgba(5, 3, 12, 0.9);
  padding: 50px 0 30px 0;
  margin-top: 80px;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
  margin-bottom: 30px;
}

.footer-logo {
  font-size: 20px;
  font-weight: 700;
}

.footer-desc {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 5px;
}

.footer-links {
  display: flex;
  gap: 20px;
  list-style: none;
}

.footer-links a {
  color: var(--text-muted);
  font-size: 14px;
}

.footer-links a:hover {
  color: var(--primary);
}

.footer-bottom {
  text-align: center;
  font-size: 13px;
  color: var(--text-muted);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 20px;
}

/* --------------------------------------------------------------------------
   11. Article Detail Page Layout
   -------------------------------------------------------------------------- */
.article-page {
  padding: 40px 0 80px 0;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 30px;
}

.article-container {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 40px;
}

.article-body {
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  border-radius: 24px;
  padding: 40px;
  backdrop-filter: blur(15px);
}

.article-header-detail {
  margin-bottom: 35px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  padding-bottom: 25px;
}

.article-main-title {
  font-size: 34px;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 15px;
}

.article-meta-bar {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 14px;
  color: var(--text-muted);
}

.article-content h2 {
  font-size: 24px;
  font-weight: 700;
  margin: 35px 0 15px 0;
  color: var(--text-main);
  border-left: 4px solid var(--primary);
  padding-left: 12px;
}

.article-content h3 {
  font-size: 19px;
  font-weight: 700;
  margin: 25px 0 12px 0;
}

.article-content p {
  font-size: 16px;
  line-height: 1.8;
  margin-bottom: 18px;
  color: #d1d5db;
}

.article-content ul, .article-content ol {
  margin: 0 0 20px 25px;
  color: #d1d5db;
}

.article-content li {
  margin-bottom: 8px;
  line-height: 1.7;
}

.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 25px 0;
  background: rgba(0, 0, 0, 0.2);
  border-radius: 12px;
  overflow: hidden;
}

.article-content th, .article-content td {
  padding: 14px 18px;
  text-align: left;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.article-content th {
  background: rgba(168, 85, 247, 0.15);
  color: var(--primary);
  font-weight: 700;
}

.callout {
  padding: 20px 25px;
  border-radius: 14px;
  margin: 25px 0;
  border-left: 5px solid var(--primary);
  background: rgba(168, 85, 247, 0.08);
}

.callout-info {
  border-color: #3b82f6;
  background: rgba(59, 130, 246, 0.08);
}

.callout-warning {
  border-color: #f59e0b;
  background: rgba(245, 158, 11, 0.08);
}

.callout-success {
  border-color: #10b981;
  background: rgba(16, 185, 129, 0.08);
}

.advantage-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 15px;
  margin: 20px 0;
}

.adv-card {
  background: rgba(255, 255, 255, 0.04);
  padding: 18px;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.sidebar-card {
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  padding: 25px;
  margin-bottom: 25px;
  backdrop-filter: blur(12px);
}

.sidebar-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 15px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  padding-bottom: 10px;
}

.sidebar-nav-list {
  list-style: none;
}

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

.sidebar-nav-list a {
  color: var(--text-muted);
  font-size: 14px;
  display: block;
}

.sidebar-nav-list a:hover {
  color: var(--primary);
  transform: translateX(4px);
}

/* --------------------------------------------------------------------------
   12. Responsive Design
   -------------------------------------------------------------------------- */
@media (max-width: 992px) {
  .hero-title { font-size: 38px; }
  .article-container { grid-template-columns: 1fr; }
  .nav-links { display: none; } /* Mobile toggle can be added */
}

@media (max-width: 768px) {
  .hero-title { font-size: 30px; }
  .hero-subtitle { font-size: 16px; }
  .section-title { font-size: 28px; }
  .pricing-grid { grid-template-columns: 1fr; }
  .advantages-grid { grid-template-columns: 1fr; }
  .node-board-header { flex-direction: column; align-items: flex-start; }
}