/* ==========================================================================
   YOU-TU 悠兔机场官网 (you-tu.lol) - 核心原生样式表
   零重型框架依赖 · 秒开性能设计 · 极简原生响应式架构
   ========================================================================== */

:root {
  /* 品牌色谱 - 悠兔科技流光 (霓虹红/橙/蓝极速流线) */
  --primary: #FF5500;
  --primary-hover: #FF7722;
  --primary-glow: rgba(255, 85, 0, 0.45);
  --secondary: #FF0055;
  --secondary-glow: rgba(255, 0, 85, 0.4);
  --accent-cyan: #00E5FF;
  --accent-cyan-glow: rgba(0, 229, 255, 0.35);
  --accent-gold: #FFB800;

  /* 背景与表面深色科技阶梯 */
  --bg-deep: #07090E;
  --bg-dark: #0D111A;
  --bg-card: rgba(18, 24, 38, 0.75);
  --bg-card-hover: rgba(26, 34, 54, 0.9);
  --bg-elevated: #161D2B;

  /* 文字颜色体系 */
  --text-main: #F8FAFC;
  --text-muted: #94A3B8;
  --text-dim: #64748B;
  --border-light: rgba(255, 255, 255, 0.08);
  --border-active: rgba(255, 85, 0, 0.4);

  /* 基础尺寸与过渡 */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 24px;
  --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --max-width: 1200px;
}

/* 基础重置 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-family);
  background-color: var(--bg-deep);
  color: var(--text-main);
  scroll-behavior: smooth;
  line-height: 1.6;
  -webkit-text-size-adjust: 100%;
}

body {
  position: relative;
  min-height: 100vh;
  overflow-x: hidden;
  background-color: var(--bg-deep);
  font-size: 15px;
}

/* 链接基础 */
a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition);
}

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

/* 动态背景层 (Pure CSS 流光 + 动态 Canvas) */
#dynamic-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 0;
}

.ambient-lights {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 1;
  overflow: hidden;
}

.ambient-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0.22;
  animation: pulseLight 12s infinite alternate ease-in-out;
}

.ambient-glow-1 {
  top: -10%;
  left: 10%;
  width: 50vw;
  height: 50vw;
  background: radial-gradient(circle, #FF0055, transparent 70%);
}

.ambient-glow-2 {
  top: 30%;
  right: -10%;
  width: 55vw;
  height: 55vw;
  background: radial-gradient(circle, #FF5500, transparent 70%);
  animation-delay: -4s;
}

.ambient-glow-3 {
  bottom: -15%;
  left: 20%;
  width: 60vw;
  height: 60vw;
  background: radial-gradient(circle, #00E5FF, transparent 70%);
  animation-delay: -8s;
  opacity: 0.15;
}

@keyframes pulseLight {
  0% { transform: scale(1) translate(0, 0); }
  50% { transform: scale(1.15) translate(3%, 4%); }
  100% { transform: scale(0.95) translate(-2%, -3%); }
}

.cyber-grid-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 2;
  background-image: 
    linear-gradient(to right, rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 50px 50px;
  mask-image: radial-gradient(ellipse at center, rgba(0,0,0,1) 30%, rgba(0,0,0,0) 80%);
  -webkit-mask-image: radial-gradient(ellipse at center, rgba(0,0,0,1) 30%, rgba(0,0,0,0) 80%);
}

/* 主容器 */
.site-wrapper {
  position: relative;
  z-index: 3;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

/* 按钮规范与通用视觉 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 600;
  border-radius: var(--radius-md);
  padding: 10px 22px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: var(--transition);
  text-align: center;
  white-space: nowrap;
  font-size: 15px;
}

.btn-primary {
  background: linear-gradient(135deg, #00F2FE 0%, #00A6FF 50%, #0066FF 100%);
  color: #FFFFFF;
  box-shadow: 0 4px 20px rgba(0, 200, 255, 0.45);
  position: relative;
  overflow: hidden;
}

.btn-primary::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
  transition: 0.6s ease;
}

.btn-primary:hover::after {
  left: 100%;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0, 220, 255, 0.7);
  color: #FFFFFF;
}

.btn-outline {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(255, 255, 255, 0.15);
  color: #FFFFFF;
  backdrop-filter: blur(8px);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: var(--primary);
  transform: translateY(-2px);
  color: #FFFFFF;
}

.btn-sm {
  padding: 8px 16px;
  font-size: 13.5px;
  border-radius: var(--radius-sm);
}

.btn-lg {
  padding: 14px 32px;
  font-size: 17px;
  border-radius: var(--radius-lg);
  font-weight: 700;
}

.btn-glow {
  animation: pulseGlow 3s infinite alternate;
}

@keyframes pulseGlow {
  0% { box-shadow: 0 4px 18px rgba(0, 220, 255, 0.45); }
  100% { box-shadow: 0 6px 30px rgba(0, 114, 255, 0.75); }
}

/* 顶部导航 (Header) */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(7, 9, 14, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-light);
  height: 72px;
  display: flex;
  align-items: center;
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo-link {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.logo-img {
  height: 44px;
  width: auto;
  transition: var(--transition);
}

.logo-link:hover .logo-img {
  filter: brightness(1.15) drop-shadow(0 0 12px var(--primary-glow));
}

.nav-menu {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 22px;
}

.nav-link {
  font-size: 14.5px;
  color: var(--text-muted);
  font-weight: 500;
  padding: 6px 4px;
  position: relative;
}

.nav-link:hover, .nav-link.active {
  color: #FFFFFF;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: var(--transition);
  transform: translateX(-50%);
}

.nav-link:hover::after, .nav-link.active::after {
  width: 80%;
}

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

.mobile-menu-btn {
  display: none;
  background: transparent;
  border: none;
  color: #FFFFFF;
  font-size: 26px;
  cursor: pointer;
  line-height: 1;
}

/* 首屏 Hero Section */
.hero-section {
  padding: 80px 0 60px;
  text-align: center;
  position: relative;
}

.hero-announcement {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(0, 229, 255, 0.1);
  border: 1px solid rgba(0, 229, 255, 0.3);
  padding: 6px 16px;
  border-radius: 999px;
  font-size: 13.5px;
  color: #7DD3FC;
  margin-bottom: 24px;
}

.hero-pulse-dot {
  width: 8px;
  height: 8px;
  background-color: var(--accent-cyan);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--accent-cyan);
  animation: blinkDot 1.6s infinite ease-in-out;
}

@keyframes blinkDot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.3; transform: scale(0.8); }
}

.hero-title {
  font-size: 46px;
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.5px;
  margin-bottom: 22px;
}

.text-gradient {
  background: linear-gradient(135deg, #FFFFFF 20%, #FFA07A 50%, #FF5500 80%, #00E5FF 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 18px;
  color: var(--text-muted);
  max-width: 800px;
  margin: 0 auto 36px;
  line-height: 1.7;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 50px;
}

.hero-stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  max-width: 960px;
  margin: 0 auto 36px;
}

.hero-stat-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 18px 12px;
  text-align: center;
  transition: var(--transition);
}

.hero-stat-card:hover {
  border-color: var(--border-active);
  transform: translateY(-3px);
  background: var(--bg-card-hover);
}

.hero-stat-num {
  font-size: 28px;
  font-weight: 800;
  margin-bottom: 4px;
}

.hero-stat-label {
  font-size: 12.5px;
  color: var(--text-muted);
}

.text-cyan { color: var(--accent-cyan); }
.text-gold { color: var(--accent-gold); }

.client-badges-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 20px;
}

.client-badge-item {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-light);
  border-radius: 999px;
  padding: 6px 14px;
  font-size: 13px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
}

/* 章节通用标题 */
.section {
  padding: 70px 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 46px;
}

.section-badge {
  display: inline-block;
  padding: 4px 12px;
  background: rgba(255, 85, 0, 0.12);
  border: 1px solid rgba(255, 85, 0, 0.3);
  color: var(--primary);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  border-radius: 999px;
  margin-bottom: 12px;
}

.section-badge-cyan {
  background: rgba(0, 229, 255, 0.1);
  border-color: rgba(0, 229, 255, 0.3);
  color: var(--accent-cyan);
}

.section-title {
  font-size: 32px;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 12px;
}

.section-desc {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* 节点实时测速板块 */
.nodes-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.node-item-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 18px;
  transition: var(--transition);
}

.node-item-card:hover {
  border-color: var(--accent-cyan);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 229, 255, 0.15);
}

.node-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.node-country {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 15px;
}

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

.node-ping-badge {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 12px;
  font-weight: 700;
  color: #10B981;
  background: rgba(16, 185, 129, 0.12);
  padding: 3px 8px;
  border-radius: 999px;
  border: 1px solid rgba(16, 185, 129, 0.25);
}

.node-details {
  font-size: 13px;
  color: var(--text-muted);
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 12px;
}

.node-detail-row {
  display: flex;
  justify-content: space-between;
}

.node-tag-list {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.node-tag {
  font-size: 11px;
  padding: 2px 7px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 4px;
  color: var(--text-muted);
}

/* 核心优势板块 (Features) */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.feature-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 26px 22px;
  transition: var(--transition);
}

.feature-card:hover {
  border-color: var(--border-active);
  transform: translateY(-4px);
  background: var(--bg-card-hover);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

.feature-icon-wrapper {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, rgba(255, 85, 0, 0.18), rgba(255, 0, 85, 0.18));
  border: 1px solid rgba(255, 85, 0, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  margin-bottom: 18px;
}

.feature-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 10px;
  color: #FFFFFF;
}

.feature-desc {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.65;
}

/* ==========================================================================
   套餐定价板块 - STRICT ALL PRICES IN SAME ROW ON DESKTOP
   所有价格同排展示
   ========================================================================== */
.pricing-section {
  position: relative;
}

.pricing-grid-same-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 26px 20px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  transition: var(--transition);
}

.pricing-card:hover {
  border-color: var(--border-active);
  transform: translateY(-5px);
  background: var(--bg-card-hover);
  box-shadow: 0 12px 36px rgba(255, 85, 0, 0.2);
}

/* 热门高亮推荐卡片 */
.pricing-card.pricing-featured {
  border: 1.5px solid var(--accent-cyan);
  background: linear-gradient(180deg, rgba(0, 229, 255, 0.12) 0%, rgba(18, 24, 38, 0.85) 100%);
  box-shadow: 0 8px 30px rgba(0, 229, 255, 0.25);
  transform: scale(1.02);
}

.pricing-card.pricing-featured:hover {
  transform: scale(1.02) translateY(-5px);
  box-shadow: 0 16px 42px rgba(0, 229, 255, 0.45);
}

.pricing-badge-popular {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(90deg, #00F0FF, #0072FF);
  color: #FFFFFF;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.5px;
  padding: 4px 14px;
  border-radius: 999px;
  box-shadow: 0 4px 14px rgba(0, 194, 255, 0.5);
  white-space: nowrap;
}
  white-space: nowrap;
}

.pricing-header {
  margin-bottom: 16px;
  text-align: center;
}

.pricing-tier-name {
  font-size: 19px;
  font-weight: 800;
  margin-bottom: 4px;
}

.pricing-tier-desc {
  font-size: 12px;
  color: var(--text-muted);
}

.pricing-price-box {
  text-align: center;
  padding: 16px 0;
  margin-bottom: 18px;
  border-top: 1px solid var(--border-light);
  border-bottom: 1px solid var(--border-light);
}

.pricing-currency {
  font-size: 20px;
  font-weight: 700;
  color: var(--primary);
  vertical-align: top;
}

.pricing-amount {
  font-size: 40px;
  font-weight: 900;
  color: #FFFFFF;
  line-height: 1;
}

.pricing-period {
  font-size: 13px;
  color: var(--text-dim);
}

.pricing-features-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 24px;
  font-size: 13.5px;
}

.pricing-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 9px;
  color: var(--text-muted);
}

.pricing-feature-item svg {
  flex-shrink: 0;
  margin-top: 2px;
  color: var(--accent-cyan);
}

.pricing-feature-item strong {
  color: var(--text-main);
}

.pricing-btn {
  width: 100%;
}

/* 客户端支持生态 (Clients) */
.client-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.client-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 22px 18px;
  text-align: center;
  transition: var(--transition);
}

.client-card:hover {
  border-color: var(--border-active);
  transform: translateY(-3px);
  background: var(--bg-card-hover);
}

.client-logo-box {
  font-size: 32px;
  margin-bottom: 10px;
}

.client-name {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 4px;
}

.client-platform {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.internal-link {
  font-size: 12.5px;
  color: var(--primary);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

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

/* 文章专栏精选网格 (Articles Grid) */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.article-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 22px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition);
}

.article-card:hover {
  border-color: var(--border-active);
  transform: translateY(-4px);
  background: var(--bg-card-hover);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
}

.article-badge {
  display: inline-block;
  padding: 2px 8px;
  background: rgba(255, 85, 0, 0.15);
  color: var(--primary);
  font-size: 11px;
  font-weight: 700;
  border-radius: 4px;
  margin-bottom: 10px;
}

.article-card-title {
  font-size: 16px;
  font-weight: 700;
  line-height: 1.45;
  margin-bottom: 10px;
  color: #FFFFFF;
  transition: var(--transition);
}

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

.article-card-excerpt {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 16px;
}

.article-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12px;
  color: var(--text-dim);
  border-top: 1px solid var(--border-light);
  padding-top: 12px;
}

/* 用户评价板块 (Testimonials) */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.testimonial-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: var(--transition);
}

.testimonial-card:hover {
  border-color: var(--border-active);
  transform: translateY(-3px);
  background: var(--bg-card-hover);
}

.testimonial-stars {
  color: var(--accent-gold);
  font-size: 16px;
  margin-bottom: 12px;
  letter-spacing: 2px;
}

.testimonial-quote {
  font-size: 14.5px;
  color: var(--text-main);
  line-height: 1.65;
  margin-bottom: 18px;
  font-style: italic;
}

.testimonial-user {
  display: flex;
  align-items: center;
  gap: 12px;
}

.user-avatar-circle {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: linear-gradient(135deg, #FF0055, #FF5500);
  color: #FFFFFF;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 14px;
  flex-shrink: 0;
}

.user-info-name {
  font-size: 14px;
  font-weight: 700;
  color: #FFFFFF;
}

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

/* 常见问题 FAQ 手风琴 (Accordion) */
.faq-accordion {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
}

.faq-item:hover, .faq-item.active {
  border-color: rgba(0, 229, 255, 0.4);
  box-shadow: 0 4px 20px rgba(0, 229, 255, 0.08);
}

.faq-question {
  width: 100%;
  background: transparent;
  border: none;
  padding: 18px 22px;
  text-align: left;
  font-size: 15.5px;
  font-weight: 700;
  color: var(--text-main);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  transition: var(--transition);
}

.faq-question:hover {
  color: var(--accent-cyan);
}

.faq-icon {
  font-size: 20px;
  color: var(--accent-cyan);
  transition: transform 0.25s ease, color 0.25s ease, text-shadow 0.25s ease;
  flex-shrink: 0;
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
  color: #00F2FE;
  text-shadow: 0 0 12px rgba(0, 229, 255, 0.75);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  padding: 0 22px;
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.7;
  transition: max-height 0.3s cubic-bezier(0.16, 1, 0.3, 1), padding 0.3s ease;
}

.faq-item.active .faq-answer {
  max-height: 300px;
  padding: 0 22px 20px;
}

/* 权威开源生态外链板块 (Ecosystem Outlinks) */
.ecosystem-section {
  padding: 40px 0 60px;
  border-top: 1px solid var(--border-light);
}

.ecosystem-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.ecosystem-card {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  transition: var(--transition);
}

.ecosystem-card:hover {
  background: rgba(255, 255, 255, 0.06);
  border-color: var(--primary);
  transform: translateY(-2px);
}

.ecosystem-icon {
  font-size: 22px;
}

.ecosystem-name {
  font-size: 13.5px;
  font-weight: 700;
  color: #FFFFFF;
}

.ecosystem-desc {
  font-size: 11px;
  color: var(--text-dim);
}

/* 页脚 (Footer) */
.site-footer {
  background: #05070B;
  border-top: 1px solid var(--border-light);
  padding: 60px 0 30px;
  font-size: 13.5px;
}

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

.footer-brand-desc {
  color: var(--text-muted);
  line-height: 1.65;
  margin: 16px 0;
  max-width: 340px;
}

.footer-col-title {
  font-size: 15px;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 16px;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-link {
  color: var(--text-muted);
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: center;
  text-align: center;
  color: var(--text-dim);
  font-size: 12px;
}

/* ==========================================================================
   响应式设计规范 (Responsive Media Queries)
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-title { font-size: 38px; }
  .pricing-grid-same-row {
    grid-template-columns: repeat(2, 1fr);
  }
  .features-grid, .articles-grid, .nodes-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .client-grid, .ecosystem-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 30px;
  }
}

@media (max-width: 768px) {
  .site-header { height: 64px; }
  .logo-img { height: 38px; }
  
  .mobile-menu-btn { display: block; }
  
  .nav-menu {
    position: absolute;
    top: 64px;
    left: 0;
    width: 100%;
    background: rgba(10, 14, 22, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 24px;
    gap: 16px;
    border-bottom: 1px solid var(--border-light);
    display: none;
  }
  
  .nav-menu.open { display: flex; }
  
  .hero-title { font-size: 30px; }
  .hero-subtitle { font-size: 15px; }
  
  .hero-stats-row {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .pricing-grid-same-row {
    grid-template-columns: 1fr;
  }
  
  .features-grid, .articles-grid, .nodes-grid, .testimonials-grid {
    grid-template-columns: 1fr;
  }
  
  .client-grid, .ecosystem-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
  }
}