/* ===================================================================
   TAG Internet - 官方落地页样式表 (Modern, Clean, High-Performance)
   =================================================================== */

:root {
  --primary: #E03628;
  --primary-hover: #C5291C;
  --primary-light: #FFF0EE;
  --primary-glow: rgba(224, 54, 40, 0.25);
  --dark: #121417;
  --dark-surface: #1E2227;
  --text-main: #1F2429;
  --text-muted: #586069;
  --text-light: #8C95A0;
  --bg-page: #FAFBFD;
  --bg-card: #FFFFFF;
  --border-color: rgba(0, 0, 0, 0.07);
  --border-focus: rgba(224, 54, 40, 0.4);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.1);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
  color: var(--text-main);
  background-color: var(--bg-page);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

body {
  position: relative;
  min-height: 100vh;
  overflow-x: hidden;
  background-image: 
    linear-gradient(to right, rgba(0, 0, 0, 0.025) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(0, 0, 0, 0.025) 1px, transparent 1px);
  background-size: 32px 32px;
}

/* ================= 通用容器与排版 ================= */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

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

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 56px;
}

.section-tag {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--primary);
  background: var(--primary-light);
  padding: 6px 16px;
  border-radius: var(--radius-full);
  margin-bottom: 16px;
}

.section-title {
  font-size: 36px;
  font-weight: 800;
  line-height: 1.25;
  color: var(--text-main);
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}

.section-desc {
  font-size: 17px;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ================= 顶部导航 ================= */
.header-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(250, 251, 253, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  padding: 16px 0;
  transition: var(--transition);
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition);
}

.brand-logo:hover {
  transform: scale(1.03);
}

.logo-badge {
  background: var(--primary);
  color: #fff;
  font-weight: 900;
  font-size: 15px;
  padding: 4px 10px;
  border-radius: 6px;
  letter-spacing: 0.5px;
  box-shadow: 0 2px 8px var(--primary-glow);
}

.logo-text {
  font-size: 20px;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.5px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-muted);
  font-size: 15px;
  font-weight: 600;
  transition: var(--transition);
}

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

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

.lang-switch {
  display: flex;
  align-items: center;
  background: #EEF2F6;
  padding: 4px;
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: 700;
}

.lang-switch span {
  padding: 4px 10px;
  border-radius: var(--radius-full);
  color: var(--text-muted);
  cursor: pointer;
}

.lang-switch span.active {
  background: #FFF;
  color: var(--text-main);
  box-shadow: 0 1px 4px rgba(0,0,0,0.08);
}

/* ================= 按钮体系 ================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  font-weight: 700;
  padding: 12px 26px;
  border-radius: var(--radius-full);
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid transparent;
  gap: 8px;
  white-space: nowrap;
}

.btn-primary {
  background: var(--primary);
  color: #FFF;
  box-shadow: 0 4px 16px var(--primary-glow);
}

.btn-primary:hover {
  background: var(--primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(224, 54, 40, 0.35);
}

.btn-secondary {
  background: #FFF;
  color: var(--text-main);
  border-color: #DDE2E8;
}

.btn-secondary:hover {
  border-color: var(--text-main);
  background: #F8FAFC;
  transform: translateY(-2px);
}

.btn-recommend {
  background: linear-gradient(135deg, #FF6B4A 0%, #E03628 100%);
  color: #FFF;
  border: 1px solid #FF8E75;
  box-shadow: 0 4px 16px rgba(224, 54, 40, 0.28);
}

.btn-recommend:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(224, 54, 40, 0.4);
}

/* ================= 主视觉 Hero ================= */
.hero-section {
  padding: 60px 0 80px;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  align-items: center;
  gap: 48px;
}

.invite-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #FFF3F1;
  color: #C5291C;
  font-size: 13px;
  font-weight: 700;
  padding: 8px 16px;
  border-radius: var(--radius-full);
  margin-bottom: 12px;
  border: 1px solid rgba(224, 54, 40, 0.15);
}

.invite-subnote {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: #C5291C;
  font-weight: 600;
  margin-bottom: 24px;
}

.hero-headline {
  font-size: 54px;
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -1.5px;
  margin-bottom: 20px;
}

.hero-headline .brand-tag {
  color: var(--primary);
}

.hero-headline .brand-net {
  color: var(--text-main);
  font-weight: 800;
}

.hero-subtext {
  font-size: 20px;
  color: var(--text-muted);
  margin-bottom: 36px;
  line-height: 1.6;
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
}

/* Hero 右侧动态卡片 */
.hero-visual-wrap {
  position: relative;
  display: flex;
  justify-content: center;
}

.subscription-card {
  width: 100%;
  max-width: 440px;
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: 0 20px 48px rgba(0, 0, 0, 0.08);
  border: 1px solid var(--border-color);
  position: relative;
  z-index: 2;
  transition: var(--transition);
}

.subscription-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.12);
}

.sub-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
}

.sub-status {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 15px;
  color: var(--text-main);
}

.sub-status-icon {
  color: var(--primary);
  font-size: 16px;
}

.plan-badge {
  background: #FEE8E5;
  color: var(--primary);
  font-size: 12px;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 6px;
}

.traffic-metrics {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  text-align: left;
  margin-bottom: 18px;
}

.metric-label {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.metric-val {
  font-size: 22px;
  font-weight: 800;
  color: var(--text-main);
}

.metric-val small {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  margin-left: 2px;
}

.progress-track {
  width: 100%;
  height: 8px;
  background: #EDF2F7;
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: 28px;
}

.progress-fill {
  height: 100%;
  width: 25.6%;
  background: linear-gradient(90deg, #E03628, #FF6B4A);
  border-radius: 4px;
}

.clients-title {
  font-size: 12px;
  color: var(--text-light);
  text-align: center;
  margin-bottom: 14px;
}

.clients-icons {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  margin-bottom: 24px;
}

.client-svg-icon {
  width: 26px;
  height: 26px;
  fill: #3A434F;
  opacity: 0.85;
  transition: var(--transition);
}

.client-svg-icon:hover {
  opacity: 1;
  fill: var(--primary);
  transform: scale(1.15);
}

.btn-card-copy {
  width: 100%;
  background: var(--primary);
  color: #FFF;
  border: none;
  font-weight: 700;
  font-size: 15px;
  padding: 14px;
  border-radius: 12px;
  cursor: pointer;
  box-shadow: 0 4px 12px var(--primary-glow);
  transition: var(--transition);
}

.btn-card-copy:hover {
  background: var(--primary-hover);
  transform: translateY(-2px);
}

/* 浮动节点延迟卡片 */
.latency-float-card {
  position: absolute;
  bottom: -40px;
  left: -20px;
  background: #FFF;
  border-radius: 14px;
  padding: 16px 20px;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.12);
  border: 1px solid var(--border-color);
  z-index: 3;
  width: 290px;
  animation: floatBounce 4s ease-in-out infinite;
}

@keyframes floatBounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

.latency-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-main);
}

.live-indicator {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 11px;
  color: #10B981;
  font-weight: 700;
}

.live-dot {
  width: 7px;
  height: 7px;
  background: #10B981;
  border-radius: 50%;
  box-shadow: 0 0 6px rgba(16, 185, 129, 0.6);
  animation: pulseDot 2s infinite;
}

@keyframes pulseDot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.85); }
}

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

.latency-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12px;
}

.node-info {
  display: flex;
  align-items: center;
  gap: 8px;
}

.node-flag {
  font-size: 14px;
}

.node-name {
  font-weight: 600;
  color: var(--text-main);
  line-height: 1.2;
}

.node-desc {
  font-size: 10px;
  color: var(--text-muted);
}

.node-ping {
  font-weight: 700;
  color: #10B981;
  background: #ECFDF5;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 11px;
}

/* ================= 黑色统计横幅 ================= */
.stats-banner {
  background: #111315;
  color: #FFF;
  padding: 48px 0;
  margin-top: 40px;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  text-align: center;
}

.stat-item {
  position: relative;
}

.stat-item:not(:last-child)::after {
  content: "";
  position: absolute;
  right: 0;
  top: 15%;
  height: 70%;
  width: 1px;
  background: rgba(255, 255, 255, 0.1);
}

.stat-num {
  font-size: 38px;
  font-weight: 900;
  letter-spacing: -0.5px;
  margin-bottom: 6px;
  color: #FFF;
}

.stat-tagline {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.65);
}

/* ================= 3大核心优势 ================= */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.feature-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
  border-color: var(--border-focus);
}

.feature-icon-box {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  background: var(--primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  color: var(--primary);
  font-size: 26px;
}

.feature-title {
  font-size: 21px;
  font-weight: 800;
  margin-bottom: 14px;
  color: var(--text-main);
}

.feature-text {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 20px;
  flex-grow: 1;
}

.feature-list {
  list-style: none;
  border-top: 1px dashed #E2E8F0;
  padding-top: 16px;
}

.feature-list li {
  font-size: 13px;
  color: var(--text-main);
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}

.feature-list li::before {
  content: "✓";
  color: var(--primary);
  font-weight: 900;
}

/* ================= 流媒体与 AI 支持图卡 ================= */
.media-ai-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.media-ai-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 36px;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

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

.media-ai-badge {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  margin-bottom: 16px;
}

.badge-stream {
  background: #EEF2FF;
  color: #4F46E5;
}

.badge-ai {
  background: #FDF2F8;
  color: #DB2777;
}

.media-ai-card h3 {
  font-size: 24px;
  font-weight: 800;
  margin-bottom: 12px;
  color: var(--text-main);
}

.media-ai-card p {
  font-size: 15px;
  color: var(--text-muted);
  margin-bottom: 28px;
  line-height: 1.6;
}

.icon-logo-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.service-pill {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 16px 12px;
  background: #F8FAFC;
  border-radius: 12px;
  border: 1px solid #E2E8F0;
  transition: var(--transition);
  text-align: center;
  gap: 8px;
}

.service-pill:hover {
  background: #FFF;
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.service-icon {
  width: 32px;
  height: 32px;
  object-fit: contain;
}

.service-name {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-main);
}

.service-status {
  font-size: 11px;
  color: #10B981;
  font-weight: 600;
}

/* ================= 真实套餐价格对比表 ================= */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  position: relative;
  transition: var(--transition);
}

.pricing-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
}

.pricing-card.popular {
  border: 2px solid var(--primary);
  box-shadow: 0 12px 32px rgba(224, 54, 40, 0.15);
}

.ribbon-tag {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--primary);
  color: #FFF;
  font-size: 12px;
  font-weight: 800;
  padding: 4px 14px;
  border-radius: var(--radius-full);
  letter-spacing: 0.5px;
  box-shadow: 0 2px 8px var(--primary-glow);
}

.price-header {
  margin-bottom: 24px;
  text-align: center;
}

.plan-title {
  font-size: 20px;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 6px;
}

.plan-subtitle {
  font-size: 13px;
  color: var(--text-muted);
}

.price-box {
  margin: 18px 0;
}

.currency {
  font-size: 20px;
  font-weight: 800;
  color: var(--text-main);
}

.amount {
  font-size: 42px;
  font-weight: 900;
  color: var(--text-main);
  letter-spacing: -1px;
}

.billing-cycle {
  font-size: 13px;
  color: var(--text-muted);
}

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

.plan-specs li {
  font-size: 14px;
  color: var(--text-main);
  padding: 10px 0;
  border-bottom: 1px solid #F1F5F9;
  display: flex;
  align-items: center;
  gap: 10px;
}

.plan-specs li .spec-check {
  color: #10B981;
  font-weight: bold;
}

.btn-plan {
  width: 100%;
  padding: 13px;
  text-align: center;
  border-radius: var(--radius-full);
  font-size: 15px;
}

/* ================= 12篇 SEO 文章图卡 ================= */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.article-card {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

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

.article-badge-bar {
  padding: 18px 22px 10px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.article-category {
  font-size: 12px;
  font-weight: 700;
  color: var(--primary);
  background: var(--primary-light);
  padding: 3px 10px;
  border-radius: 4px;
}

.article-date {
  font-size: 12px;
  color: var(--text-light);
}

.article-body {
  padding: 0 22px 22px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.article-card-title {
  font-size: 17px;
  font-weight: 800;
  line-height: 1.4;
  margin-bottom: 10px;
}

.article-card-title a {
  text-decoration: none;
  color: var(--text-main);
  transition: var(--transition);
}

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

.article-card-excerpt {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 18px;
  flex-grow: 1;
}

.article-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid #F1F5F9;
  padding-top: 14px;
}

.read-more-link {
  font-size: 13px;
  font-weight: 700;
  color: var(--primary);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

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

.cta-mini-link {
  font-size: 12px;
  color: #10B981;
  font-weight: 700;
  text-decoration: none;
}

/* ================= 用户评价 ================= */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.testimonial-card {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 30px;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

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

.user-stars {
  color: #F59E0B;
  font-size: 16px;
  margin-bottom: 14px;
}

.user-quote {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 20px;
  font-style: italic;
}

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

.user-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: #E2E8F0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  color: var(--text-main);
  font-size: 14px;
}

.user-name {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-main);
}

.user-title {
  font-size: 12px;
  color: var(--text-light);
}

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

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
}

.faq-question {
  width: 100%;
  text-align: left;
  padding: 22px 24px;
  background: none;
  border: none;
  font-size: 17px;
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  transition: var(--transition);
}

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

.faq-icon {
  font-size: 20px;
  font-weight: 400;
  color: var(--text-muted);
  transition: transform 0.3s ease;
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease-out, padding 0.35s ease-out;
  padding: 0 24px;
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  max-height: 300px;
  padding: 0 24px 22px;
}

/* ================= 页脚 Footer ================= */
.footer-wrap {
  background: #111315;
  color: #A0AEC0;
  padding: 60px 0 36px;
  border-top: 1px solid #23272C;
}

.footer-nav-grid {
  display: flex;
  justify-content: center;
  gap: 40px;
  margin-bottom: 36px;
  flex-wrap: wrap;
}

.footer-nav-link {
  color: #E2E8F0;
  font-size: 16px;
  font-weight: 700;
  text-decoration: none;
  transition: var(--transition);
  position: relative;
  padding: 4px 8px;
}

.footer-nav-link:hover {
  color: #FFF;
  transform: translateY(-1px);
}

.footer-divider {
  width: 100%;
  height: 1px;
  background: #23272C;
  margin: 30px 0;
}

/* PBN 与友情链接声明区 */
.pbn-statement-box {
  text-align: center;
  font-size: 14px;
  color: #718096;
  line-height: 1.8;
  max-width: 900px;
  margin: 0 auto;
}

.pbn-statement-box p {
  margin-bottom: 12px;
}

.pbn-link {
  color: #CBD5E0;
  font-weight: 700;
  text-decoration: none;
  padding: 2px 8px;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.05);
  margin: 0 6px;
  transition: var(--transition);
}

.pbn-link:hover {
  color: #FFF;
  background: var(--primary);
}

.footer-copyright {
  font-size: 13px;
  color: #4A5568;
  margin-top: 16px;
}

/* ================= 右侧浮动章节切换器 ================= */
.floating-scroll-nav {
  position: fixed;
  right: 24px;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  gap: 12px;
  z-index: 99;
}

.scroll-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: #FFF;
  border: 1px solid rgba(0, 0, 0, 0.1);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-main);
  transition: var(--transition);
  font-size: 18px;
}

.scroll-btn:hover {
  background: var(--primary);
  color: #FFF;
  border-color: var(--primary);
  transform: scale(1.1);
  box-shadow: 0 6px 20px var(--primary-glow);
}

.scroll-btn:active {
  transform: scale(0.95);
}

/* 右下角客服图标 */
.floating-chat-bubble {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--primary);
  color: #FFF;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 6px 20px rgba(224, 54, 40, 0.4);
  cursor: pointer;
  z-index: 99;
  text-decoration: none;
  transition: var(--transition);
}

.floating-chat-bubble:hover {
  transform: scale(1.1) rotate(6deg);
  background: var(--primary-hover);
}

/* ================= 响应式适配 (移动端优先) ================= */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }
  .hero-visual-wrap {
    margin-top: 20px;
  }
  .features-grid,
  .articles-grid,
  .testimonials-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .stat-item:nth-child(2)::after {
    display: none;
  }
}

@media (max-width: 768px) {
  .section-wrapper {
    padding: 50px 0;
  }
  .section-title {
    font-size: 28px;
  }
  .hero-headline {
    font-size: 38px;
  }
  .hero-subtext {
    font-size: 16px;
  }
  .nav-links {
    display: none;
  }
  .features-grid,
  .media-ai-container,
  .pricing-grid,
  .articles-grid,
  .testimonials-grid,
  .stats-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .stat-item::after {
    display: none !important;
  }
  .floating-scroll-nav {
    right: 12px;
  }
  .scroll-btn {
    width: 38px;
    height: 38px;
    font-size: 15px;
  }
  .latency-float-card {
    position: static;
    margin-top: 16px;
    width: 100%;
    animation: none;
  }
  .subscription-card {
    padding: 20px;
  }
  .hero-cta-group {
    flex-direction: column;
    align-items: stretch;
  }
  .hero-cta-group .btn {
    width: 100%;
    text-align: center;
  }
  .footer-nav-grid {
    gap: 18px;
    flex-direction: column;
    text-align: center;
  }
}