/* ===================================================================
   ImmTelecom (immtelecom.surf) - 官方极速落地页原生核心样式表
   零重型框架依赖 · 纯原生现代 CSS · 毫秒级秒开渲染
   =================================================================== */

:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
  --font-mono: "SF Mono", "Fira Code", Consolas, Monaco, monospace;

  /* 主题色系 - 深邃星空与电光蓝极速科技 */
  --bg-primary: #07090e;
  --bg-secondary: #0c111c;
  --bg-card: rgba(16, 24, 40, 0.72);
  --bg-card-hover: rgba(23, 34, 57, 0.88);
  --bg-glass: rgba(15, 23, 42, 0.65);

  --border-subtle: rgba(56, 189, 248, 0.12);
  --border-focus: rgba(56, 189, 248, 0.45);
  --border-highlight: rgba(99, 102, 241, 0.5);

  --text-main: #f1f5f9;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --text-accent: #38bdf8;
  --text-gold: #fbbf24;

  --accent-cyan: #06b6d4;
  --accent-blue: #3b82f6;
  --accent-purple: #8b5cf6;
  --accent-emerald: #10b981;
  --accent-rose: #f43f5e;

  /* 渐变特效 */
  --grad-cyan-blue: linear-gradient(135deg, #06b6d4 0%, #3b82f6 50%, #8b5cf6 100%);
  --grad-text: linear-gradient(135deg, #ffffff 20%, #7dd3fc 60%, #a78bfa 100%);
  --grad-card-border: linear-gradient(135deg, rgba(56, 189, 248, 0.35), rgba(139, 92, 246, 0.15), rgba(255, 255, 255, 0.05));
  --grad-glow: radial-gradient(circle at 50% 0%, rgba(56, 189, 248, 0.18), transparent 70%);

  --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -4px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 8px 10px -6px rgba(0, 0, 0, 0.5);
  --shadow-cyan: 0 0 25px -5px rgba(56, 189, 248, 0.35);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  --container-max: 1240px;
  --nav-height: 76px;
}

/* 全局重置与平滑滚动 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.6;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  position: relative;
  min-height: 100vh;
  overflow-x: hidden;
  background: radial-gradient(circle at 50% 15%, #08162b 0%, #060b18 55%, #03060d 100%);
  background-color: var(--bg-primary);
}

/* 动态背景 Canvas 容器 (海豚深海动态画卷) */
#bg-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
  opacity: 0.88;
}

/* 页面主要内容容器，置于动态背景之上 */
.page-wrapper {
  position: relative;
  z-index: 1;
}

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

/* 排版与基础元素 */
a {
  color: inherit;
  text-decoration: none;
  transition: all 0.2s ease;
}

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

ul {
  list-style: none;
}

/* 按钮规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 12px 24px;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  text-align: center;
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn-primary {
  background: var(--grad-cyan-blue);
  color: #ffffff;
  box-shadow: 0 4px 20px rgba(6, 182, 212, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(59, 130, 246, 0.5);
  filter: brightness(1.1);
}

.btn-outline {
  background: rgba(15, 23, 42, 0.6);
  color: var(--text-main);
  border: 1px solid var(--border-subtle);
  backdrop-filter: blur(8px);
}

.btn-outline:hover {
  background: rgba(56, 189, 248, 0.12);
  border-color: var(--text-accent);
  color: #ffffff;
  transform: translateY(-2px);
}

.btn-sm {
  padding: 8px 18px;
  font-size: 0.88rem;
}

.btn-lg {
  padding: 16px 36px;
  font-size: 1.08rem;
}

.btn-block {
  display: flex;
  width: 100%;
}

/* 头部导航 Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-height);
  background: rgba(7, 9, 14, 0.82);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  transition: background 0.3s ease, border-color 0.3s ease;
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

/* 左侧 Logo */
.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.brand-logo-img {
  height: 44px;
  width: auto;
  object-fit: contain;
}

/* 导航链接 */
.nav-menu {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-muted);
  position: relative;
  padding: 6px 0;
}

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

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

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

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

/* 移动端菜单切换汉堡按钮 */
.mobile-toggle {
  display: none;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 8px;
  color: var(--text-main);
}

.mobile-toggle svg {
  width: 26px;
  height: 26px;
}

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

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: rgba(56, 189, 248, 0.08);
  border: 1px solid rgba(56, 189, 248, 0.25);
  padding: 8px 20px;
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  color: var(--text-accent);
  margin-bottom: 24px;
  animation: pulseGlow 4s infinite alternate;
}

.hero-pill .pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--accent-emerald);
  box-shadow: 0 0 10px var(--accent-emerald);
}

.hero-title {
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -0.02em;
  margin-bottom: 24px;
  background: var(--grad-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--text-muted);
  max-width: 820px;
  margin: 0 auto 36px;
  line-height: 1.7;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  flex-wrap: wrap;
  margin-bottom: 50px;
}

/* 信任背书与网络性能指标条 */
.hero-stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  max-width: 1040px;
  margin: 0 auto;
  padding: 24px;
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.stat-item {
  text-align: center;
  padding: 10px;
}

.stat-value {
  font-size: 1.85rem;
  font-weight: 700;
  color: #ffffff;
  font-family: var(--font-mono);
  background: linear-gradient(180deg, #ffffff 30%, #38bdf8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* 通用区块排版 */
.section {
  padding: 90px 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 54px;
}

.section-tag {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-accent);
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  font-weight: 700;
  line-height: 1.25;
  color: #ffffff;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 1.02rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* ===================================================================
   定价方案区块 (Pricing) - 核心要求：所有价格 100% 同排展示
   =================================================================== */
.pricing-section {
  position: relative;
  background: linear-gradient(180deg, transparent, rgba(12, 17, 28, 0.7) 30%, transparent);
}

/* 计费周期切换控制器 */
.pricing-cycle-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: rgba(15, 23, 42, 0.8);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  padding: 6px;
  max-width: 480px;
  margin: 0 auto 40px;
  backdrop-filter: blur(8px);
}

.cycle-btn {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 600;
  padding: 10px 18px;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all 0.25s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

.cycle-btn.active {
  background: var(--grad-cyan-blue);
  color: #ffffff;
  box-shadow: 0 4px 15px rgba(6, 182, 212, 0.3);
}

.save-pill {
  background: #f43f5e;
  color: #ffffff;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: var(--radius-full);
}

/* 核心同排网格布局：严格 4 列同排 (repeat(4, 1fr)) */
.pricing-grid-same-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  align-items: stretch;
}

.price-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.3s ease, box-shadow 0.3s ease;
  overflow: hidden;
}

.price-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-focus);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.6), var(--shadow-cyan);
}

/* POPULAR 热门推荐卡片高亮 */
.price-card.featured {
  background: linear-gradient(180deg, rgba(23, 34, 57, 0.95) 0%, rgba(15, 23, 42, 0.85) 100%);
  border: 2px solid #38bdf8;
  box-shadow: 0 15px 35px rgba(6, 182, 212, 0.25);
  transform: scale(1.02);
}

.price-card.featured:hover {
  transform: scale(1.02) translateY(-6px);
  box-shadow: 0 25px 45px rgba(6, 182, 212, 0.35);
}

.featured-ribbon {
  position: absolute;
  top: 14px;
  right: -32px;
  background: linear-gradient(135deg, #f43f5e, #f97316);
  color: #ffffff;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 4px 36px;
  transform: rotate(45deg);
  letter-spacing: 0.05em;
  box-shadow: 0 2px 10px rgba(244, 63, 94, 0.4);
}

.plan-tier-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--text-accent);
  background: rgba(56, 189, 248, 0.1);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
}

.plan-name {
  font-size: 1.4rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 6px;
}

.plan-summary {
  font-size: 0.86rem;
  color: var(--text-muted);
  min-height: 42px;
  line-height: 1.5;
  margin-bottom: 20px;
}

.price-amount-box {
  background: rgba(10, 16, 28, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.04);
  border-radius: var(--radius-md);
  padding: 16px;
  margin-bottom: 24px;
  text-align: center;
}

.price-main {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 3px;
}

.price-currency {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-accent);
}

.price-number {
  font-size: 2.5rem;
  font-weight: 800;
  font-family: var(--font-mono);
  color: #ffffff;
  line-height: 1;
}

.price-cycle {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-left: 4px;
}

.price-equivalent {
  font-size: 0.8rem;
  color: var(--text-accent);
  margin-top: 6px;
  font-weight: 500;
}

.plan-features-list {
  margin-bottom: 28px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.plan-features-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.88rem;
  color: var(--text-main);
  line-height: 1.45;
}

.feature-icon-check {
  color: var(--accent-emerald);
  font-weight: bold;
  font-size: 0.95rem;
  flex-shrink: 0;
  margin-top: 1px;
}

.plan-cta-wrap {
  margin-top: auto;
}

.price-footnote {
  text-align: center;
  font-size: 0.76rem;
  color: var(--text-dim);
  margin-top: 10px;
}

/* ===================================================================
   技术优势 Section (Features)
   =================================================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-box {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px 26px;
  transition: all 0.3s ease;
  backdrop-filter: blur(10px);
}

.feature-box:hover {
  transform: translateY(-4px);
  border-color: var(--border-focus);
  background: var(--bg-card-hover);
}

.feature-box-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: rgba(56, 189, 248, 0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  margin-bottom: 20px;
  color: var(--text-accent);
}

.feature-box-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 12px;
}

.feature-box-desc {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* ===================================================================
   全球节点分布与动态测速 (Global Nodes & Ping Test)
   =================================================================== */
.nodes-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 40px;
}

.node-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: all 0.25s ease;
}

.node-card:hover {
  border-color: var(--text-accent);
  background: var(--bg-card-hover);
}

.node-info-left {
  display: flex;
  align-items: center;
  gap: 14px;
}

.node-flag {
  font-size: 1.8rem;
}

.node-name {
  font-weight: 700;
  font-size: 1.05rem;
  color: #ffffff;
}

.node-tags {
  font-size: 0.78rem;
  color: var(--text-dim);
  margin-top: 2px;
}

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

.node-latency {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--accent-emerald);
}

.node-status-dot {
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: var(--accent-emerald);
  margin-right: 5px;
}

/* 测速演示面板 */
.speed-test-panel {
  background: linear-gradient(135deg, rgba(16, 24, 40, 0.9), rgba(12, 17, 28, 0.95));
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 30px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 24px;
}

.speed-test-info h4 {
  font-size: 1.25rem;
  color: #ffffff;
  margin-bottom: 8px;
}

.speed-test-info p {
  color: var(--text-muted);
  font-size: 0.92rem;
}

.speed-meters {
  display: flex;
  gap: 30px;
}

.speed-meter-item {
  text-align: center;
}

.speed-meter-val {
  font-family: var(--font-mono);
  font-size: 1.9rem;
  font-weight: 700;
  color: var(--text-accent);
}

.speed-meter-label {
  font-size: 0.8rem;
  color: var(--text-dim);
  text-transform: uppercase;
}

/* ===================================================================
   知识专栏 / 文章聚合 (Articles Showcase)
   =================================================================== */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 40px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.3s ease;
}

.article-card:hover {
  transform: translateY(-5px);
  border-color: var(--text-accent);
  box-shadow: var(--shadow-md);
}

.article-card-body {
  padding: 26px 24px 18px;
}

.article-category-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent-cyan);
  background: rgba(6, 182, 212, 0.12);
  padding: 3px 10px;
  border-radius: var(--radius-full);
  margin-bottom: 14px;
}

.article-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.45;
  color: #ffffff;
  margin-bottom: 12px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

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

.article-card-snippet {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-card-footer {
  padding: 14px 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.82rem;
  color: var(--text-dim);
}

.article-read-more {
  color: var(--text-accent);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.article-read-more:hover {
  text-decoration: underline;
}

.articles-cta-center {
  text-align: center;
}

/* ===================================================================
   用户评价 Section (Testimonials)
   =================================================================== */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.testimonial-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  backdrop-filter: blur(10px);
  transition: all 0.3s ease;
}

.testimonial-card:hover {
  border-color: var(--border-focus);
  transform: translateY(-4px);
}

.testimonial-stars {
  color: var(--text-gold);
  font-size: 1rem;
  margin-bottom: 14px;
  letter-spacing: 2px;
}

.testimonial-text {
  font-size: 0.94rem;
  color: var(--text-main);
  line-height: 1.7;
  margin-bottom: 22px;
  font-style: italic;
}

.testimonial-author-box {
  display: flex;
  align-items: center;
  gap: 14px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 16px;
}

.author-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--grad-cyan-blue);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1rem;
  flex-shrink: 0;
}

.author-name {
  font-weight: 700;
  font-size: 0.95rem;
  color: #ffffff;
}

.author-role {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.verified-badge {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  font-size: 0.72rem;
  color: var(--accent-emerald);
  background: rgba(16, 185, 129, 0.1);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  margin-left: 6px;
}

/* ===================================================================
   常见问题解答 FAQ Section
   =================================================================== */
.faq-container {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all 0.25s ease;
}

.faq-item.active {
  border-color: var(--text-accent);
  background: var(--bg-card-hover);
}

.faq-question {
  width: 100%;
  background: transparent;
  border: none;
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  text-align: left;
  font-size: 1.05rem;
  font-weight: 600;
  color: #ffffff;
}

.faq-icon {
  font-size: 1.3rem;
  color: var(--text-accent);
  transition: transform 0.25s ease;
  line-height: 1;
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  background: rgba(10, 16, 28, 0.4);
}

.faq-answer-inner {
  padding: 0 24px 22px;
  font-size: 0.94rem;
  color: var(--text-muted);
  line-height: 1.75;
}

/* ===================================================================
   生态外链与权威资源区块 (External Authority Links)
   =================================================================== */
.partners-section {
  padding: 40px 0;
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
  background: rgba(12, 17, 28, 0.5);
}

.partners-title {
  text-align: center;
  font-size: 0.88rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  margin-bottom: 24px;
}

.partners-flex {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 28px;
}

.partner-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  color: var(--text-muted);
  padding: 8px 18px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-full);
  transition: all 0.2s ease;
}

.partner-link:hover {
  color: #ffffff;
  border-color: var(--text-accent);
  background: rgba(56, 189, 248, 0.1);
  transform: translateY(-2px);
}

/* ===================================================================
   底部行动呼召 (Bottom CTA Banner)
   =================================================================== */
.cta-banner-section {
  padding: 70px 0;
  text-align: center;
}

.cta-banner-box {
  background: linear-gradient(135deg, rgba(6, 182, 212, 0.15) 0%, rgba(59, 130, 246, 0.2) 50%, rgba(139, 92, 246, 0.15) 100%);
  border: 1px solid var(--border-focus);
  border-radius: var(--radius-xl);
  padding: 60px 30px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(16px);
}

.cta-banner-title {
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 18px;
}

.cta-banner-desc {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 650px;
  margin: 0 auto 36px;
}

/* ===================================================================
   网站页脚 Footer
   =================================================================== */
.site-footer {
  background: #05070a;
  border-top: 1px solid var(--border-subtle);
  padding: 60px 0 30px;
  color: var(--text-muted);
  font-size: 0.9rem;
}

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

.footer-col-brand p {
  margin-top: 14px;
  font-size: 0.88rem;
  line-height: 1.65;
  color: var(--text-dim);
  max-width: 320px;
}

.footer-col-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 18px;
}

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

.footer-links-list a {
  color: var(--text-muted);
  font-size: 0.88rem;
}

.footer-links-list a:hover {
  color: var(--text-accent);
}

.footer-bottom-bar {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.82rem;
  color: var(--text-dim);
}

.footer-geo-tags {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

/* ===================================================================
   动画关键帧定义
   =================================================================== */
@keyframes pulseGlow {
  0% {
    box-shadow: 0 0 10px rgba(56, 189, 248, 0.2);
  }
  100% {
    box-shadow: 0 0 25px rgba(56, 189, 248, 0.45);
  }
}

/* ===================================================================
   响应式断点适配 (Responsive Breakpoints)
   =================================================================== */
@media (max-width: 1200px) {
  .pricing-grid-same-row {
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
  }
  .price-card {
    padding: 24px 16px;
  }
  .price-number {
    font-size: 2.1rem;
  }
}

@media (max-width: 1024px) {
  .features-grid,
  .articles-grid,
  .testimonials-grid,
  .nodes-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .pricing-grid-same-row {
    grid-template-columns: repeat(2, 1fr);
    gap: 18px;
  }
  
  .footer-top-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    width: 100%;
    background: rgba(7, 9, 14, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 30px;
    gap: 20px;
    border-bottom: 1px solid var(--border-subtle);
    transform: translateY(-120%);
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    z-index: 99;
  }

  .nav-menu.open {
    transform: translateY(0);
  }

  .mobile-toggle {
    display: block;
  }

  .hero-stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .pricing-grid-same-row {
    grid-template-columns: 1fr;
  }

  .features-grid,
  .articles-grid,
  .testimonials-grid,
  .nodes-grid {
    grid-template-columns: 1fr;
  }

  .speed-meters {
    flex-direction: column;
    gap: 12px;
  }

  .footer-top-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  
  .footer-bottom-bar {
    flex-direction: column;
    text-align: center;
  }
}