/* ==================================================
   气泡云 (Bubble Cloud) - 第1套: 气泡舱阵列系统 样式表
   ================================================== */

:root {
  --bg: #F5F9FC;
  --surface: #FFFFFF;
  --surface-soft: #EEF7FA;
  --text: #172733;
  --muted: #586B78;
  --muted-sub: #8797A2;
  --tech-blue: #28698C;
  --tech-blue-dark: #194C69;
  --tech-blue-mid: #3F7E9C;
  --ice-blue: #72B8D7;
  --ice-blue-soft: #E8F5FA;
  --cyan: #4D9FAE;
  --cyan-dark: #367B87;
  --cyan-soft: #E8F3F3;
  --silver: #D9E5EA;
  --silver-soft: #EFF5F7;
  --accent: #D88B4D;
  --accent-dark: #B86D37;
  --accent-soft: #F8EEE5;
  --border: #D7E5EB;
  --border-dark: #BFD3DC;
  --shadow-sm: 0 4px 20px rgba(23, 39, 51, 0.04);
  --shadow-md: 0 12px 40px rgba(23, 39, 51, 0.06);
  --radius-bubble: 50%;
  --radius-pod: 24px;
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
}

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

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

body {
  line-height: 1.75;
  background-color: var(--bg);
  color: var(--text);
  overflow-x: hidden;
}

/* 链接与按钮 */
a {
  color: var(--tech-blue);
  text-decoration: none;
  transition: color 0.2s ease, opacity 0.2s ease;
}

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

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

/* 通用容器与布局 */
.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 80px 0;
  position: relative;
}

.section-header {
  margin-bottom: 48px;
}

.section-tag {
  display: inline-block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--tech-blue-mid);
  letter-spacing: 1px;
  margin-bottom: 8px;
}

.section-title {
  font-size: 2.125rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1.35;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 1.0625rem;
  color: var(--muted);
  max-width: 820px;
  line-height: 1.8;
}

/* 按钮样式 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: 40px;
  transition: all 0.25s ease;
  cursor: pointer;
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--tech-blue);
  color: #FFFFFF;
  box-shadow: 0 4px 16px rgba(40, 105, 140, 0.25);
}

.btn-primary:hover {
  background-color: var(--tech-blue-dark);
  color: #FFFFFF;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(40, 105, 140, 0.35);
}

.btn-secondary {
  background-color: var(--surface);
  color: var(--tech-blue-dark);
  border-color: var(--border-dark);
}

.btn-secondary:hover {
  background-color: var(--ice-blue-soft);
  border-color: var(--tech-blue-mid);
  color: var(--tech-blue-dark);
  transform: translateY(-2px);
}

.btn-accent {
  background-color: var(--accent);
  color: #FFFFFF;
}

.btn-accent:hover {
  background-color: var(--accent-dark);
  color: #FFFFFF;
}

/* 页面 Header */
.site-header {
  height: 72px;
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(245, 249, 252, 0.94);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
}

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

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

.logo-svg {
  width: 40px;
  height: 40px;
}

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

.brand-name {
  font-size: 1.35rem;
  font-weight: 750;
  color: var(--tech-blue-dark);
  line-height: 1.1;
  letter-spacing: -0.5px;
}

.brand-slogan {
  font-size: 0.75rem;
  color: var(--muted-sub);
  letter-spacing: 0.5px;
}

.nav-desktop {
  display: flex;
  align-items: center;
  gap: 18px;
}

.nav-link {
  font-size: 0.9375rem;
  color: var(--muted);
  font-weight: 500;
  position: relative;
  padding: 6px 0;
}

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

.nav-link.active {
  color: var(--tech-blue-dark);
  font-weight: 650;
}

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 50%;
  transform: translateX(-50%);
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--tech-blue);
}

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

/* 移动端菜单按钮 */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  color: var(--tech-blue-dark);
}

.mobile-nav {
  display: none;
  position: fixed;
  top: 72px;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--bg);
  padding: 24px;
  flex-direction: column;
  gap: 16px;
  z-index: 999;
  overflow-y: auto;
}

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

.mobile-nav .nav-link {
  font-size: 1.125rem;
  padding: 10px 0;
  border-bottom: 1px dashed var(--border);
}

/* ==================================================
   Hero Section: 气泡舱阵列封面
   ================================================== */
.hero-section {
  position: relative;
  min-height: 720px;
  padding: 70px 0 80px;
  background: linear-gradient(180deg, #F5F9FC 0%, #EEF7FA 100%);
  overflow: hidden;
  display: flex;
  align-items: center;
}

.hero-container {
  position: relative;
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
}

.hero-center {
  max-width: 580px;
  margin: 0 auto;
  text-align: center;
  position: relative;
  z-index: 10;
  padding: 10px 0;
}

.hero-sub-tag {
  display: inline-block;
  padding: 5px 16px;
  background-color: var(--ice-blue-soft);
  border: 1px solid var(--ice-blue);
  color: var(--tech-blue);
  border-radius: 20px;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 16px;
}

.hero-tagline {
  font-size: 1.25rem;
  color: var(--tech-blue-mid);
  font-weight: 650;
  margin-bottom: 14px;
}

.hero-title {
  font-size: 2.5rem;
  font-weight: 750;
  color: var(--tech-blue-dark);
  line-height: 1.35;
  margin-bottom: 20px;
  letter-spacing: -0.5px;
}

.hero-desc {
  font-size: 1.0625rem;
  color: var(--muted);
  line-height: 1.8;
  margin-bottom: 32px;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

.hero-text-link {
  display: inline-block;
  font-size: 0.9375rem;
  color: var(--tech-blue);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 4px;
}

/* Hero 6个信息气泡 - 精确两翼分布，绝对不与中心 580px 冲突 */
.hero-bubble-layer {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.hero-bubble {
  position: absolute;
  pointer-events: auto;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.90);
  border: 1.5px solid rgba(40, 105, 140, 0.28);
  box-shadow: 0 10px 32px rgba(23, 39, 51, 0.05);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 16px;
  transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
  animation: bubbleFloat 8s ease-in-out infinite alternate;
}

.hero-bubble:hover {
  transform: translateY(-4px) scale(1.03);
  border-color: var(--tech-blue);
  box-shadow: 0 16px 44px rgba(40, 105, 140, 0.16);
}

/* 左侧 3 泡 (紧贴左翼) */
.bubble-mobile {
  width: 145px;
  height: 145px;
  top: 25px;
  left: 1%;
  animation-delay: 2s;
}

.bubble-streaming {
  width: 185px;
  height: 185px;
  top: 200px;
  left: 0%;
  animation-delay: 1.5s;
}

.bubble-desktop {
  width: 160px;
  height: 160px;
  top: 415px;
  left: 4%;
  animation-delay: 4.5s;
}

/* 右侧 3 泡 (紧贴右翼) */
.bubble-ai {
  width: 215px;
  height: 215px;
  top: 15px;
  right: 0%;
  animation-delay: 0s;
  background: linear-gradient(135deg, rgba(255,255,255,0.92) 0%, rgba(232,245,250,0.92) 100%);
}

.bubble-data {
  width: 170px;
  height: 170px;
  top: 250px;
  right: 0%;
  animation-delay: 5s;
}

.bubble-region {
  width: 195px;
  height: 195px;
  top: 430px;
  right: 3%;
  animation-delay: 3s;
}

/* 移动端/小屏气泡网格 */
.mobile-hero-bubbles {
  display: none;
}

.mobile-bubble-pod {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 20px;
  text-align: center;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.mobile-bubble-pod:hover {
  border-color: var(--tech-blue-mid);
}

/* 纯装饰气泡 */
.dec-bubble {
  position: absolute;
  border-radius: 50%;
  background: rgba(114, 184, 215, 0.12);
  border: 1px solid rgba(114, 184, 215, 0.25);
  pointer-events: none;
  z-index: 1;
}

.dec-1 { width: 80px; height: 80px; top: 8%; left: 24%; opacity: 0.15; }
.dec-2 { width: 45px; height: 45px; bottom: 12%; left: 28%; opacity: 0.15; }
.dec-3 { width: 60px; height: 60px; top: 10%; right: 25%; opacity: 0.15; }
.dec-4 { width: 35px; height: 35px; bottom: 15%; right: 27%; opacity: 0.20; }

.bubble-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--tech-blue-dark);
  margin-bottom: 4px;
}

.bubble-tags {
  font-size: 0.8125rem;
  color: var(--tech-blue);
  font-weight: 600;
  margin-bottom: 6px;
}

.bubble-sub {
  font-size: 0.75rem;
  color: var(--muted);
  line-height: 1.35;
}

@keyframes bubbleFloat {
  0% { transform: translateY(0px); }
  100% { transform: translateY(-8px); }
}

/* ==================================================
   Section 01: 你主要用来做什么？(4类场景气泡舱)
   ================================================== */
.scenarios-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
  margin-top: 40px;
}

.scenario-pod {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-pod);
  padding: 36px;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all 0.3s ease;
}

.scenario-pod:hover {
  border-color: var(--tech-blue-mid);
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}

.scenario-pod-ai {
  border-top-left-radius: 120px;
  background: linear-gradient(145deg, var(--ice-blue-soft) 0%, var(--surface) 100%);
}

.scenario-pod-video {
  border-top-right-radius: 120px;
  background: linear-gradient(145deg, var(--cyan-soft) 0%, var(--surface) 100%);
}

.scenario-pod-work {
  border-bottom-left-radius: 120px;
  background: linear-gradient(145deg, var(--silver-soft) 0%, var(--surface) 100%);
}

.scenario-pod-multi {
  border-bottom-right-radius: 120px;
  background: linear-gradient(145deg, var(--surface) 0%, var(--ice-blue-soft) 100%);
}

.pod-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.pod-badge {
  display: inline-block;
  padding: 4px 12px;
  background-color: rgba(40, 105, 140, 0.1);
  color: var(--tech-blue);
  font-size: 0.8125rem;
  font-weight: 700;
  border-radius: 12px;
}

.pod-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--tech-blue-dark);
}

.pod-desc {
  font-size: 0.9375rem;
  color: var(--muted);
  line-height: 1.7;
  margin-bottom: 20px;
}

.pod-item-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}

.pod-item-tag {
  padding: 4px 12px;
  background-color: var(--surface);
  border: 1px solid var(--border);
  font-size: 0.8125rem;
  color: var(--text);
  border-radius: 16px;
}

.pod-focus {
  font-size: 0.875rem;
  color: var(--tech-blue-dark);
  font-weight: 600;
  background-color: rgba(255,255,255,0.7);
  padding: 10px 14px;
  border-radius: 10px;
  border-left: 3px solid var(--tech-blue);
}

/* ==================================================
   Section 02: AI工具需要关注什么？
   ================================================== */
.ai-section-pod {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-pod);
  padding: 40px;
  box-shadow: var(--shadow-sm);
}

.ai-bubbles-wrapper {
  display: grid;
  grid-template-columns: 1.2fr 1.8fr;
  gap: 36px;
  align-items: center;
}

.ai-big-pod {
  background: linear-gradient(135deg, var(--ice-blue-soft) 0%, var(--surface) 100%);
  border: 1px solid var(--ice-blue);
  border-radius: 50%;
  width: 330px;
  height: 330px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 32px;
  box-shadow: var(--shadow-sm);
}

.ai-big-title {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--tech-blue-dark);
  margin-bottom: 12px;
}

.ai-big-text {
  font-size: 0.9375rem;
  color: var(--muted);
  line-height: 1.6;
}

.ai-mid-bubbles {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.ai-mid-pod {
  background-color: var(--bg);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 20px 24px;
  display: flex;
  align-items: flex-start;
  gap: 16px;
}

.ai-mid-icon {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background-color: var(--ice-blue-soft);
  color: var(--tech-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.1rem;
  flex-shrink: 0;
}

.ai-mid-content h3 {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 4px;
}

.ai-mid-content p {
  font-size: 0.875rem;
  color: var(--muted);
}

.ai-index-list {
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px dashed var(--border);
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}

.ai-index-item {
  font-size: 0.9375rem;
  color: var(--muted);
}

.ai-index-item strong {
  color: var(--tech-blue-dark);
}

/* ==================================================
   Section 03: 流媒体用户需要关注什么？
   ================================================== */
.streaming-ring-container {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 40px;
}

.streaming-ring-card {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: 120px 120px 24px 24px;
  padding: 40px 28px 32px;
  text-align: center;
  position: relative;
  transition: all 0.3s ease;
}

.streaming-ring-card:hover {
  border-color: var(--cyan);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.ring-badge {
  width: 64px;
  height: 64px;
  margin: 0 auto 20px;
  border-radius: 50%;
  background-color: var(--cyan-soft);
  border: 1.5px solid var(--cyan);
  color: var(--cyan-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.2rem;
}

.streaming-ring-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--tech-blue-dark);
  margin-bottom: 12px;
}

.streaming-ring-card p {
  font-size: 0.9375rem;
  color: var(--muted);
  line-height: 1.7;
  margin-bottom: 16px;
}

/* ==================================================
   Section 04: 日常网页和办公需要多少？
   ================================================== */
.work-pod-layout {
  display: flex;
  align-items: center;
  gap: 24px;
  margin-top: 40px;
}

.work-main-oval {
  flex: 2;
  background: linear-gradient(135deg, var(--surface) 0%, var(--silver-soft) 100%);
  border: 1px solid var(--border);
  border-radius: 40px;
  padding: 44px;
  box-shadow: var(--shadow-sm);
}

.work-side-pod {
  flex: 1;
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: 50% 50% 24px 24px;
  padding: 32px 24px;
  text-align: center;
}

.work-side-pod h4 {
  font-size: 1.125rem;
  color: var(--tech-blue-dark);
  margin-bottom: 8px;
}

.work-side-pod p {
  font-size: 0.875rem;
  color: var(--muted);
}

/* ==================================================
   Section 05: 多设备应该怎么规划？
   ================================================== */
.device-cluster-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 40px;
}

.device-bubble-card {
  background-color: var(--surface);
  border: 1px solid var(--border);
  padding: 32px 20px;
  text-align: center;
  transition: all 0.3s ease;
}

.device-bubble-win {
  border-radius: 40px / 80px;
  background-color: var(--ice-blue-soft);
}

.device-bubble-mac {
  border-radius: 100px 100px 16px 16px;
  background-color: var(--cyan-soft);
}

.device-bubble-android {
  border-radius: 80px / 40px;
  background-color: var(--silver-soft);
}

.device-bubble-iphone {
  border-radius: 50%;
  aspect-ratio: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  background-color: var(--surface-soft);
  border-color: var(--ice-blue);
}

.device-bubble-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.device-bubble-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--tech-blue-dark);
  margin-bottom: 8px;
}

.device-bubble-card p {
  font-size: 0.875rem;
  color: var(--muted);
  line-height: 1.6;
}

/* ==================================================
   Section 06: 不同场景需要多少流量？
   ================================================== */
.data-strip-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 40px;
}

.data-pod-strip {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: 60px 20px 60px 20px;
  padding: 32px 24px;
  text-align: center;
  position: relative;
  transition: all 0.3s ease;
}

.data-pod-strip:hover {
  border-color: var(--tech-blue);
  transform: translateY(-3px);
  box-shadow: var(--shadow-sm);
}

.data-volume {
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--tech-blue-dark);
  line-height: 1.1;
  margin-bottom: 4px;
}

.data-volume span {
  font-size: 1rem;
  font-weight: 600;
  color: var(--tech-blue-mid);
}

.data-pod-strip h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 12px;
}

.data-pod-strip p {
  font-size: 0.875rem;
  color: var(--muted);
  line-height: 1.6;
}

/* ==================================================
   Section 07: 香港、日本、新加坡、美国怎么选？
   ================================================== */
.region-cluster-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.9fr 1.1fr 1fr;
  gap: 20px;
  margin-top: 40px;
  align-items: center;
}

.region-pod-card {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: 32px;
  padding: 32px 24px;
  position: relative;
}

.region-hk {
  border-radius: 48px;
  background: linear-gradient(135deg, var(--ice-blue-soft) 0%, var(--surface) 100%);
}

.region-jp {
  border-radius: 32px;
  background: linear-gradient(135deg, var(--cyan-soft) 0%, var(--surface) 100%);
}

.region-sg {
  border-radius: 40px;
  background: linear-gradient(135deg, var(--silver-soft) 0%, var(--surface) 100%);
}

.region-us {
  border-radius: 36px;
  background: linear-gradient(135deg, var(--accent-soft) 0%, var(--surface) 100%);
}

.region-pod-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--tech-blue-dark);
  margin-bottom: 8px;
}

.region-pod-card p {
  font-size: 0.875rem;
  color: var(--muted);
  line-height: 1.65;
}

/* ==================================================
   Section 08: 线路名称应该怎么看？(HTML 线路表)
   ================================================== */
.line-table-wrapper {
  margin-top: 40px;
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-pod);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.line-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.line-table th {
  background-color: var(--tech-blue-dark);
  color: #FFFFFF;
  font-size: 0.9375rem;
  font-weight: 600;
  padding: 16px 20px;
}

.line-table td {
  padding: 18px 20px;
  border-bottom: 1px solid var(--border);
  font-size: 0.9375rem;
  color: var(--muted);
}

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

.line-table td strong {
  color: var(--tech-blue-dark);
}

/* ==================================================
   Section 09: 完整套餐价格 (气泡舱套餐阵列)
   ================================================== */
.pricing-pods-wrapper {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
  margin-top: 40px;
  align-items: stretch;
}

.plan-pod-card {
  background-color: var(--surface);
  border: 1.5px solid var(--border);
  padding: 32px 18px 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  text-align: center;
  position: relative;
  transition: all 0.3s ease;
}

.plan-pod-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.plan-pod-light {
  border-radius: 50% 50% 20px 20px;
  background-color: var(--silver-soft);
}

.plan-pod-daily {
  border-radius: 36px / 60px;
  background-color: var(--cyan-soft);
}

.plan-pod-main {
  border-radius: 40px;
  background-color: var(--ice-blue-soft);
  border-color: var(--tech-blue);
  box-shadow: var(--shadow-md);
  transform: scale(1.04);
  z-index: 2;
}

.plan-pod-heavy {
  border-radius: 60px / 36px;
  background-color: var(--silver-soft);
}

.plan-pod-year {
  border-radius: 20px 20px 50% 50%;
  background-color: var(--surface-soft);
}

.plan-badge-main {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--accent);
  color: #FFFFFF;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 14px;
  border-radius: 12px;
}

.plan-name {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--tech-blue-dark);
  margin-bottom: 6px;
}

.plan-data {
  font-size: 0.9375rem;
  color: var(--tech-blue);
  font-weight: 600;
  margin-bottom: 16px;
}

.plan-price {
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--text);
  line-height: 1;
  margin-bottom: 16px;
}

.plan-pod-main .plan-price {
  font-size: 2.6rem;
  color: var(--tech-blue-dark);
}

.plan-price sub {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--muted);
}

.plan-features {
  font-size: 0.8125rem;
  color: var(--muted);
  line-height: 1.6;
  margin-bottom: 20px;
}

/* ==================================================
   Section 10: 气泡云场景型深度评测
   ================================================== */
.review-cluster-pod {
  background: linear-gradient(135deg, var(--ice-blue-soft) 0%, var(--surface) 100%);
  border: 1.5px solid var(--ice-blue);
  border-radius: var(--radius-pod);
  padding: 48px;
  box-shadow: var(--shadow-sm);
  margin-top: 40px;
}

.review-cluster-inner {
  max-width: 860px;
  margin: 0 auto;
}

.review-conclusion-box {
  background-color: var(--surface);
  border-left: 4px solid var(--tech-blue);
  padding: 20px 24px;
  border-radius: 12px;
  margin: 20px 0 28px;
}

.review-conclusion-box h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--tech-blue-dark);
  margin-bottom: 6px;
}

.review-conclusion-box p {
  font-size: 0.9375rem;
  color: var(--muted);
}

/* ==================================================
   Section 11: 客户端与设备
   ================================================== */
.client-rack-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 40px;
}

.client-rack-card {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 28px 20px;
  position: relative;
}

.client-rack-card h3 {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--tech-blue-dark);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.client-rack-card h3::before {
  content: "";
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--ice-blue);
}

.client-rack-card p {
  font-size: 0.875rem;
  color: var(--muted);
  line-height: 1.6;
}

/* ==================================================
   Section 12: 网络问题快速排查
   ================================================== */
.trouble-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 40px;
}

.trouble-pod-card {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 28px 24px;
}

.trouble-pod-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--tech-blue-dark);
  margin-bottom: 10px;
}

.trouble-pod-card p {
  font-size: 0.875rem;
  color: var(--muted);
  line-height: 1.65;
}

/* ==================================================
   Section 13: 场景文章中心
   ================================================== */
.articles-index-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
  margin-top: 40px;
}

.article-group-pod {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: 36px 36px 20px 20px;
  padding: 36px;
}

.article-group-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--tech-blue-dark);
  padding-bottom: 16px;
  border-bottom: 2px solid var(--ice-blue-soft);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.article-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.article-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.article-item-title {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text);
}

.article-item-title:hover {
  color: var(--tech-blue);
}

.article-item-ans {
  font-size: 0.8125rem;
  color: var(--muted);
}

/* ==================================================
   Section 14: 常见问题
   ================================================== */
.faq-container {
  max-width: 900px;
  margin: 40px auto 0;
}

.faq-item {
  border-bottom: 1px solid var(--border);
  padding: 20px 0;
}

.faq-question {
  width: 100%;
  background: none;
  border: none;
  text-align: left;
  font-size: 1.0625rem;
  font-weight: 650;
  color: var(--text);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 4px 0;
}

.faq-question-text {
  display: flex;
  align-items: center;
  gap: 12px;
}

.faq-bubble-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--ice-blue);
  flex-shrink: 0;
}

.faq-icon {
  font-size: 1.25rem;
  color: var(--tech-blue-mid);
  transition: transform 0.2s ease;
}

.faq-answer {
  padding: 12px 0 8px 22px;
  font-size: 0.9375rem;
  color: var(--muted);
  line-height: 1.7;
  display: none;
}

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

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

/* 文章详情页与分类页 */
.page-header {
  padding: 60px 0 40px;
  background: linear-gradient(180deg, var(--bg) 0%, var(--ice-blue-soft) 100%);
  border-bottom: 1px solid var(--border);
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
  color: var(--muted-sub);
  margin-bottom: 16px;
}

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

.article-hero-pod {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: 32px;
  padding: 36px;
  margin-top: 24px;
  position: relative;
  overflow: hidden;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 0.875rem;
  color: var(--muted-sub);
  margin-top: 16px;
  flex-wrap: wrap;
}

.article-layout {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 40px;
  padding: 60px 0;
}

.article-main {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 40px;
}

.article-body {
  font-size: 1.0625rem;
  line-height: 1.85;
  color: var(--text);
}

.article-body h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--tech-blue-dark);
  margin: 40px 0 20px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--ice-blue-soft);
}

.toc-sidebar {
  position: sticky;
  top: 96px;
  height: fit-content;
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 24px;
}

.toc-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--tech-blue-dark);
  margin-bottom: 16px;
}

.toc-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 0.875rem;
}

.site-footer {
  background-color: var(--tech-blue-dark);
  color: #F7FBFD;
  padding: 60px 0 30px;
  position: relative;
  overflow: hidden;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr repeat(4, 1fr);
  gap: 32px;
  margin-bottom: 40px;
}

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

.footer-brand-title {
  font-size: 1.5rem;
  font-weight: 800;
  color: #FFFFFF;
}

.footer-brand-slogan {
  font-size: 0.875rem;
  color: #C6DCE6;
}

.footer-col h4 {
  font-size: 1rem;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 16px;
  position: relative;
  padding-bottom: 8px;
}

.footer-col h4::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 20px;
  height: 2px;
  background-color: var(--ice-blue);
}

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

.footer-links a {
  color: #C6DCE6;
  font-size: 0.875rem;
}

.footer-links a:hover {
  color: #FFFFFF;
}

.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.8125rem;
  color: #C6DCE6;
}

.friend-links {
  display: flex;
  gap: 16px;
}

.friend-links a {
  color: #C6DCE6;
}

.friend-links a:hover {
  color: #FFFFFF;
}

/* ==================================================
   响应式调整 (375, 390, 430, 768, 1024, 1440px)
   ================================================== */
@media (max-width: 1200px) {
  .hero-bubble-layer {
    display: none; /* 1200px 以下隐藏绝对定位气泡，防止与文字碰撞 */
  }

  .mobile-hero-bubbles {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin-top: 36px;
  }
}

@media (max-width: 1024px) {
  .hero-section {
    min-height: auto;
    padding: 50px 0 70px;
  }

  .scenarios-grid,
  .streaming-ring-container,
  .pricing-pods-wrapper,
  .client-rack-grid,
  .data-strip-grid,
  .region-cluster-grid,
  .trouble-grid,
  .articles-index-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .plan-pod-main {
    transform: none;
  }

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

  .article-layout {
    grid-template-columns: 1fr;
  }

  .toc-sidebar {
    position: static;
  }
}

@media (max-width: 768px) {
  .nav-desktop, .header-cta-desktop {
    display: none;
  }

  .menu-toggle {
    display: block;
  }

  .hero-title {
    font-size: 2rem;
  }

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

  .scenarios-grid,
  .streaming-ring-container,
  .pricing-pods-wrapper,
  .client-rack-grid,
  .data-strip-grid,
  .region-cluster-grid,
  .trouble-grid,
  .articles-index-grid,
  .device-cluster-grid {
    grid-template-columns: 1fr;
  }

  .work-pod-layout {
    flex-direction: column;
  }

  .ai-bubbles-wrapper {
    grid-template-columns: 1fr;
  }

  .ai-big-pod {
    width: 260px;
    height: 260px;
  }

  .line-table-wrapper {
    overflow-x: auto;
  }

  .line-table {
    min-width: 600px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 480px) {
  .mobile-hero-bubbles {
    grid-template-columns: 1fr;
  }
}

/* Reduced Motion */
@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;
  }
}