/* ==========================================================================
   龙猫云 (LongMaoYun) - 流光香槟 (Liquid Champagne) 奢华动态版 CSS 样式表
   ========================================================================== */

/* 核心色彩与视觉变量 */
:root {
  --bg-main: #07080b;
  --bg-surface: #0e1017;
  --bg-card: rgba(18, 20, 29, 0.78);
  --bg-card-hover: rgba(26, 30, 44, 0.92);
  --border-glass: rgba(230, 195, 135, 0.2);
  --border-glass-hover: rgba(230, 195, 135, 0.55);
  
  /* 流光香槟金调色盘 */
  --gold-light: #fff5d6;
  --gold-primary: #f5d796;
  --gold-accent: #e6c387;
  --gold-dark: #b89355;
  --gold-deep: #8c6a34;
  --gold-shadow: rgba(230, 195, 135, 0.28);
  
  /* 奢华渐变 */
  --gold-gradient: linear-gradient(135deg, #fff8e7 0%, #f5d796 40%, #e6c387 70%, #b89355 100%);
  --gold-gradient-hover: linear-gradient(135deg, #ffffff 0%, #ffe9b8 50%, #d4af37 100%);
  --text-gradient: linear-gradient(135deg, #ffffff 25%, #f5d796 65%, #e6c387 100%);
  --gold-shimmer-bg: linear-gradient(90deg, transparent 0%, rgba(255, 245, 214, 0.35) 50%, transparent 100%);
  --bg-hero-glow: radial-gradient(ellipse at 50% 15%, rgba(230, 195, 135, 0.18) 0%, rgba(7, 8, 11, 0) 70%);
  
  /* 基础文本与间距 */
  --text-main: #f3f5fa;
  --text-muted: #9da5b8;
  --text-dark: #07080b;

  --max-width: 1260px;
  --header-height: 76px;
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-pill: 9999px;

  --transition-fast: 0.22s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.38s cubic-bezier(0.4, 0, 0.2, 1);
  --shadow-glow: 0 0 35px rgba(230, 195, 135, 0.28);
}

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

html {
  scroll-behavior: smooth;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.6;
  overflow-x: hidden;
}

body {
  background-color: var(--bg-main);
  background-image: 
    radial-gradient(circle at 15% 5%, rgba(230, 195, 135, 0.09) 0%, transparent 45%),
    radial-gradient(circle at 85% 85%, rgba(184, 147, 85, 0.07) 0%, transparent 45%);
  min-height: 100vh;
}

/* 滚动条 */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg-main); }
::-webkit-scrollbar-thumb { background: rgba(230, 195, 135, 0.35); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--gold-primary); }

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  width: 100%;
}

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

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

/* ==========================================================================
   1. 顶栏页眉与完整导航目录
   ========================================================================== */
/* ==========================================================================
   1. 顶栏页眉：高端成熟网络服务品牌风格 (Header Navbar)
   ========================================================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 68px;
  background: rgba(10, 11, 14, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  z-index: 1000;
  display: flex;
  align-items: center;
}

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

/* 1. 左侧 Logo 区域：单行紧凑排布 (图标 + 龙猫云 + LongMaoYun) */
.logo-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  cursor: pointer;
  user-select: none;
  transition: opacity 0.2s ease;
  white-space: nowrap;
}

.logo-brand:hover {
  opacity: 0.9;
}

.logo-icon-sm {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: rgba(230, 195, 135, 0.15);
  border: 1px solid rgba(230, 195, 135, 0.35);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  color: var(--gold-primary);
}

.logo-title {
  font-size: 18px;
  font-weight: 700;
  color: #ffffff;
  letter-spacing: -0.3px;
}

.logo-sub {
  font-size: 12px;
  font-weight: 500;
  color: var(--gold-primary);
  opacity: 0.85;
  margin-left: 2px;
}

/* 2. 中间单行精简导航目录 */
.nav-container {
  display: flex;
  align-items: center;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 24px;
  list-style: none;
}

.nav-link {
  color: #a0a6b5;
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  padding: 6px 0;
  position: relative;
  transition: color 0.2s ease;
  white-space: nowrap;
}

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

/* 当前页/激活状态低调金色下划线指示 */
.nav-link.active {
  color: var(--gold-primary);
  font-weight: 600;
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gold-primary);
  border-radius: 2px;
}

/* 3. 右侧精简操作按钮 */
.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.btn-nav-secondary {
  background: transparent;
  border: 1px solid rgba(230, 195, 135, 0.35);
  color: var(--gold-primary);
  padding: 7px 16px;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 500;
  text-decoration: none;
  white-space: nowrap;
  transition: all 0.2s ease;
}

.btn-nav-secondary:hover {
  background: rgba(230, 195, 135, 0.12);
  border-color: var(--gold-primary);
}

.btn-nav-primary {
  background: var(--gold-gradient);
  color: #07080b;
  padding: 7px 18px;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
  transition: all 0.2s ease;
}

.btn-nav-primary:hover {
  opacity: 0.92;
  transform: translateY(-1px);
}

/* 移动端汉堡按钮 */
.mobile-toggle-btn {
  display: none;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 6px;
  flex-direction: column;
  gap: 5px;
}

.mobile-toggle-btn span {
  width: 22px;
  height: 2px;
  background: var(--gold-primary);
  border-radius: 2px;
  transition: all 0.3s ease;
}

/* 通用按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 26px;
  border-radius: var(--radius-pill);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  transition: all var(--transition-smooth);
  cursor: pointer;
  border: none;
  user-select: none;
  white-space: nowrap;
}

.btn-primary {
  background: var(--gold-gradient);
  color: var(--text-dark);
  box-shadow: 0 4px 20px rgba(230, 195, 135, 0.35);
  position: relative;
  overflow: hidden;
}

.btn-primary:hover {
  background: var(--gold-gradient-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(230, 195, 135, 0.6);
}

.btn-outline {
  background: rgba(18, 20, 29, 0.6);
  color: var(--gold-primary);
  border: 1px solid var(--border-glass-hover);
  backdrop-filter: blur(8px);
}

.btn-outline:hover {
  background: rgba(230, 195, 135, 0.15);
  border-color: var(--gold-primary);
  transform: translateY(-2px);
}

.btn-lg {
  padding: 16px 34px;
  font-size: 16px;
}

.btn-block { width: 100%; }

/* ==========================================================================
   2. 主视觉区 (Hero Section) 左右分布 + 动态图卡元素
   ========================================================================== */
section {
  padding: 100px 0 60px 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 780px;
  margin: 0 auto 56px auto;
}

.section-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 18px;
  border-radius: 20px;
  background: rgba(230, 195, 135, 0.1);
  border: 1px solid var(--border-glass);
  color: var(--gold-primary);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.5px;
  margin-bottom: 16px;
}

.section-title {
  font-size: 40px;
  font-weight: 900;
  line-height: 1.25;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}

.section-desc {
  font-size: 16px;
  color: var(--text-muted);
  line-height: 1.7;
}

/* Hero Section 布局 */
.hero-section {
  padding-top: 155px;
  padding-bottom: 90px;
  background: var(--bg-hero-glow);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 52px;
  align-items: center;
}

.hero-content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.hero-headline {
  font-size: 50px;
  font-weight: 900;
  line-height: 1.18;
  margin-bottom: 20px;
  letter-spacing: -1px;
}

.hero-subtitle {
  font-size: 17px;
  color: var(--text-muted);
  line-height: 1.75;
  margin-bottom: 36px;
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.hero-stats {
  display: flex;
  gap: 36px;
  border-top: 1px solid var(--border-glass);
  padding-top: 28px;
  width: 100%;
}

.stat-item {
  display: flex;
  flex-direction: column;
}

.stat-value {
  font-size: 30px;
  font-weight: 900;
  color: var(--gold-primary);
  line-height: 1.2;
}

.stat-label {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 4px;
}

/* 右侧动态图卡视觉区域 (Dynamic Hero Card) */
.hero-visual-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border-glass-hover);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.7), var(--shadow-glow);
  overflow: hidden;
}

/* 动态网格背景与光效 */
.visual-bg-glow {
  position: absolute;
  top: -20%;
  left: -20%;
  width: 140%;
  height: 140%;
  background: radial-gradient(circle at 60% 40%, rgba(230, 195, 135, 0.22) 0%, transparent 60%);
  pointer-events: none;
  animation: pulseGlow 6s ease-in-out infinite alternate;
}

@keyframes pulseGlow {
  0% { transform: scale(0.9); opacity: 0.6; }
  100% { transform: scale(1.1); opacity: 1; }
}

.hero-visual-card img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  display: block;
  transition: transform 0.5s ease;
}

.hero-visual-card:hover img {
  transform: scale(1.02);
}

/* 动态浮动卡片组件 (Floating Live Metrics Cards) */
.floating-metric {
  position: absolute;
  background: rgba(10, 11, 14, 0.88);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--border-glass-hover);
  border-radius: var(--radius-md);
  padding: 12px 18px;
  display: flex;
  align-items: center;
  gap: 12px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5), 0 0 15px rgba(230, 195, 135, 0.2);
  z-index: 10;
  animation: floatAnim 4s ease-in-out infinite alternate;
}

.floating-metric.top-left {
  top: 36px;
  left: 36px;
  animation-delay: 0s;
}

.floating-metric.bottom-right {
  bottom: 36px;
  right: 36px;
  animation-delay: 2s;
}

@keyframes floatAnim {
  0% { transform: translateY(0px); }
  100% { transform: translateY(-10px); }
}

.metric-icon {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: var(--gold-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  color: var(--text-dark);
  font-weight: 800;
}

.metric-data {
  display: flex;
  flex-direction: column;
}

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

.metric-val {
  font-size: 14px;
  font-weight: 800;
  color: var(--gold-light);
}

/* 动态状态指示灯 */
.live-indicator {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: #4cd964;
  font-weight: 700;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  background-color: #4cd964;
  border-radius: 50%;
  box-shadow: 0 0 12px #4cd964;
  animation: pulsePing 1.6s cubic-bezier(0, 0, 0.2, 1) infinite;
}

@keyframes pulsePing {
  0% { transform: scale(0.95); opacity: 1; }
  50% { transform: scale(1.2); opacity: 0.5; }
  100% { transform: scale(0.95); opacity: 1; }
}

/* ==========================================================================
   3. 核心优势 细节增强 (3个奢华图文卡片)
   ========================================================================== */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.adv-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  transition: all var(--transition-smooth);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.adv-card::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gold-gradient);
  opacity: 0.2;
  transition: opacity var(--transition-fast);
}

.adv-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-glass-hover);
  transform: translateY(-8px);
  box-shadow: 0 20px 45px rgba(0, 0, 0, 0.6), 0 0 25px rgba(230, 195, 135, 0.2);
}

.adv-card:hover::after {
  opacity: 1;
}

.adv-icon-wrapper {
  width: 70px;
  height: 70px;
  background: linear-gradient(135deg, rgba(230, 195, 135, 0.15) 0%, rgba(14, 16, 23, 0.8) 100%);
  border: 1px solid var(--border-glass-hover);
  border-radius: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 32px;
  color: var(--gold-primary);
  margin-bottom: 24px;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.4);
  transition: transform var(--transition-fast);
}

.adv-card:hover .adv-icon-wrapper {
  transform: scale(1.1) rotate(4deg);
  background: var(--gold-gradient);
  color: var(--text-dark);
}

.adv-title {
  font-size: 22px;
  font-weight: 800;
  margin-bottom: 14px;
  color: var(--text-main);
}

.adv-desc {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ==========================================================================
   4. 流媒体与 AI 解锁图标细节增强
   ========================================================================== */
.features-container {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.feature-box {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 38px;
  position: relative;
  transition: all var(--transition-smooth);
}

.feature-box:hover {
  border-color: var(--border-glass-hover);
  box-shadow: var(--shadow-glow);
  transform: translateY(-4px);
}

.feature-header {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-bottom: 24px;
}

.feature-badge-icon {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  background: var(--gold-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  color: var(--text-dark);
  box-shadow: 0 6px 18px rgba(230, 195, 135, 0.35);
}

.feature-title {
  font-size: 24px;
  font-weight: 800;
}

/* 精美服务图标与标签列表 */
.service-icon-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-top: 24px;
}

.service-chip {
  padding: 12px 14px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(230, 195, 135, 0.18);
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  font-weight: 600;
  color: var(--gold-light);
  transition: all var(--transition-fast);
}

.service-chip:hover {
  background: rgba(230, 195, 135, 0.12);
  border-color: var(--gold-primary);
  transform: translateY(-2px);
}

.service-logo-icon {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
}

/* ==========================================================================
   5. 真实参考价格表 (Real Competitive Pricing Table)
   ========================================================================== */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  align-items: stretch;
}

.price-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 38px 24px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all var(--transition-smooth);
}

.price-card.popular {
  background: linear-gradient(180deg, rgba(28, 32, 46, 0.96) 0%, rgba(18, 20, 29, 0.88) 100%);
  border: 2px solid var(--gold-primary);
  box-shadow: 0 15px 45px rgba(230, 195, 135, 0.3);
  transform: translateY(-8px);
}

.popular-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gold-gradient);
  color: var(--text-dark);
  font-size: 12px;
  font-weight: 900;
  padding: 4px 18px;
  border-radius: 20px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  box-shadow: 0 4px 12px rgba(230, 195, 135, 0.4);
}

.price-header {
  text-align: center;
  border-bottom: 1px solid var(--border-glass);
  padding-bottom: 24px;
  margin-bottom: 24px;
}

.plan-name {
  font-size: 20px;
  font-weight: 800;
  margin-bottom: 10px;
}

.plan-price {
  font-size: 44px;
  font-weight: 900;
  color: var(--gold-primary);
  line-height: 1;
}

.plan-price span {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-muted);
}

.plan-desc {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 10px;
}

.plan-features {
  list-style: none;
  margin-bottom: 32px;
  flex-grow: 1;
}

.plan-features li {
  font-size: 14px;
  color: var(--text-main);
  padding: 10px 0;
  display: flex;
  align-items: center;
  gap: 10px;
  border-bottom: 1px dashed rgba(255, 255, 255, 0.06);
}

.plan-features li .check-icon {
  color: var(--gold-primary);
  font-weight: bold;
}

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

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 30px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform var(--transition-smooth);
}

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

.review-stars {
  color: #ffc107;
  font-size: 16px;
  margin-bottom: 14px;
}

.review-text {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 22px;
  font-style: italic;
}

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

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

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

.user-details .role {
  font-size: 12px;
  color: var(--gold-primary);
}

/* FAQ 手风琴 */
.faq-list {
  max-width: 880px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

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

.faq-item.active {
  border-color: var(--border-glass-hover);
}

.faq-question {
  padding: 22px 26px;
  font-size: 17px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  user-select: none;
}

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

.faq-icon {
  font-size: 22px;
  transition: transform var(--transition-fast);
  color: var(--gold-primary);
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease-out, padding 0.35s ease-out;
  padding: 0 26px;
  color: var(--text-muted);
  font-size: 15px;
  line-height: 1.75;
}

.faq-item.active .faq-answer {
  max-height: 220px;
  padding: 0 26px 22px 26px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

/* ==========================================================================
   7. 页脚规范
   ========================================================================== */
.site-footer {
  background: #050507;
  border-top: 1px solid var(--border-glass);
  padding: 65px 0 35px 0;
}

.footer-nav-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 36px;
  margin-bottom: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.footer-col {
  display: flex;
  flex-direction: column;
}

.footer-title {
  font-size: 19px;
  font-weight: 800;
  color: var(--gold-primary);
  margin-bottom: 18px;
}

.footer-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 14px;
  line-height: 2.1;
  transition: all var(--transition-fast);
  display: inline-block;
}

.footer-link:hover {
  color: var(--gold-light);
  transform: translateX(4px);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--text-muted);
  font-size: 14px;
  flex-wrap: wrap;
  gap: 16px;
}

/* ==========================================================================
   8. 右侧悬浮按章节上下切换箭头
   ========================================================================== */
.side-nav-arrows {
  position: fixed;
  right: 24px;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  gap: 12px;
  z-index: 1050;
}

.arrow-btn {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: rgba(14, 16, 23, 0.88);
  border: 1px solid var(--border-glass-hover);
  color: var(--gold-primary);
  font-size: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  backdrop-filter: blur(10px);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
  transition: all var(--transition-fast);
  user-select: none;
}

.arrow-btn:hover {
  background: var(--gold-gradient);
  color: var(--text-dark);
  transform: scale(1.15);
  box-shadow: 0 0 25px rgba(230, 195, 135, 0.65);
}

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

.arrow-btn.disabled {
  opacity: 0.25;
  cursor: not-allowed;
  pointer-events: none;
}

/* 移动端粘性底栏 */
.mobile-cta-sticky {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(7, 8, 11, 0.95);
  backdrop-filter: blur(14px);
  border-top: 1px solid var(--border-glass-hover);
  padding: 12px 20px;
  z-index: 999;
}

/* 媒体查询 Responsive */
@media (max-width: 1024px) {
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .advantages-grid { grid-template-columns: 1fr 1fr; }
  .pricing-grid { grid-template-columns: 1fr 1fr; }
  .service-icon-grid { grid-template-columns: 1fr 1fr; }
  
  /* 移动端导航离线隐藏与汉堡按钮显示 */
  .mobile-toggle-btn { display: flex; }
  .btn-nav-secondary { display: none; }
  
  .nav-container {
    display: none;
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    background: rgba(10, 11, 14, 0.96);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    padding: 20px 24px;
    box-shadow: 0 15px 30px rgba(0,0,0,0.8);
  }
  
  .nav-container.active {
    display: block;
  }
  
  .nav-menu {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }
  
  .nav-link {
    font-size: 16px;
    display: block;
    width: 100%;
    padding: 8px 0;
  }
}

@media (max-width: 768px) {
  .hero-headline { font-size: 36px; }
  .hero-subtitle { font-size: 15px; }
  .section-title { font-size: 30px; }
  .advantages-grid { grid-template-columns: 1fr; }
  .features-container { grid-template-columns: 1fr; }
  .pricing-grid { grid-template-columns: 1fr; }
  .price-card.popular { transform: none; }
  .reviews-grid { grid-template-columns: 1fr; }
  .footer-nav-grid { grid-template-columns: 1fr 1fr; gap: 24px; }
  .side-nav-arrows { right: 12px; }
  .arrow-btn { width: 42px; height: 42px; font-size: 15px; }
  .mobile-cta-sticky { display: block; }
  section { padding: 75px 0 45px 0; }
}

@media (max-width: 480px) {
  .footer-nav-grid { grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; width: 100%; }
  .btn { width: 100%; }
  .floating-metric { display: none; }
}


/* 文章图卡板块 CSS (30 篇 SEO 文章图卡展示) */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 26px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-smooth);
}

.article-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-glass-hover);
  transform: translateY(-6px);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.5), 0 0 20px rgba(230, 195, 135, 0.2);
}

.article-card-badge {
  font-size: 12px;
  background: rgba(230, 195, 135, 0.12);
  color: var(--gold-primary);
  padding: 4px 12px;
  border-radius: 12px;
  border: 1px solid rgba(230, 195, 135, 0.28);
  display: inline-block;
  margin-bottom: 14px;
  font-weight: 700;
}

.article-card-title {
  font-size: 17px;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.45;
  margin-bottom: 12px;
}

.article-card-desc {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 22px;
}

.article-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px dashed rgba(255, 255, 255, 0.08);
  padding-top: 16px;
  font-size: 13px;
}

.article-card-link {
  color: var(--gold-primary);
  text-decoration: none;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: transform var(--transition-fast);
}

.article-card-link:hover {
  color: var(--gold-light);
  transform: translateX(4px);
}

@media (max-width: 1024px) {
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .articles-grid {
    grid-template-columns: 1fr;
  }
}