/* ===================================================================
   闪狐云 (FlashFox Cloud) 官方落地页样式系统
   域名: flashfox.buzz | 品牌配色: 极客深空灰 + 闪电霓虹蓝 + 紫罗兰高光
   =================================================================== */

:root {
  --bg-primary: #080c14;
  --bg-secondary: #0f172a;
  --bg-card: rgba(15, 23, 42, 0.78);
  --bg-card-hover: rgba(30, 41, 59, 0.92);
  --bg-glass: rgba(15, 23, 42, 0.68);
  
  --primary: #38bdf8;
  --primary-glow: rgba(56, 189, 248, 0.4);
  --primary-dark: #0284c7;
  --secondary: #818cf8;
  --accent: #a855f7;
  --accent-glow: rgba(168, 85, 247, 0.35);
  
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  
  --border-subtle: rgba(148, 163, 184, 0.12);
  --border-glow: rgba(56, 189, 248, 0.4);
  --border-accent: rgba(168, 85, 247, 0.4);

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --container-max: 1360px;
}

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

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

body {
  position: relative;
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.6;
}

/* ===================================================================
   九尾狐动态视觉背景层 (Nine-Tailed Fox Dynamic Cyber Background)
   显眼突出 · 大幅飘动 · 赛博灵动仙光
   =================================================================== */
.fox-bg-wrapper {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -3;
  overflow: hidden;
  pointer-events: none;
  background-color: #050811;
}

/* 九尾狐主视觉：大幅度空灵飘动，高清晰度高显眼度 */
.fox-bg-art {
  position: absolute;
  top: -6%;
  left: -6%;
  width: 112%;
  height: 112%;
  background-image: url('../images/nine-tailed-fox.jpg');
  background-size: cover;
  background-position: center 30%;
  opacity: 0.82; /* 显著提升九尾狐显眼度，突出九尾轮廓与灵光 */
  filter: brightness(1.06) contrast(1.22) saturate(1.35);
  animation: foxLargeSway 13s cubic-bezier(0.42, 0.05, 0.58, 0.95) infinite alternate;
  will-change: transform, filter;
}

/* 九尾灵能与尾焰辉光扩散层：大振幅光晕起伏与霓虹脉冲 */
.fox-bg-glow-layer {
  position: absolute;
  top: -10%;
  left: -10%;
  width: 120%;
  height: 120%;
  background-image: url('../images/nine-tailed-fox.jpg');
  background-size: cover;
  background-position: center 30%;
  opacity: 0.45;
  filter: blur(28px) brightness(1.5) saturate(1.7);
  mix-blend-mode: screen;
  animation: foxGlowPulse 10s ease-in-out infinite alternate-reverse;
  will-change: transform, opacity, filter;
}

/* 通透舒适的背景遮罩：中心高透展现九尾天狐，边缘柔和暗角融入网页 */
.fox-bg-mask {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle at 60% 38%, rgba(8, 12, 20, 0.08) 0%, rgba(8, 12, 20, 0.35) 45%, rgba(8, 12, 20, 0.72) 75%, #080c14 100%),
              linear-gradient(180deg, rgba(8, 12, 20, 0.45) 0%, rgba(8, 12, 20, 0.15) 30%, rgba(8, 12, 20, 0.55) 70%, #080c14 100%);
}

/* 大幅度浮动摇曳关键帧 (大幅飘动、旋转与缩放) */
@keyframes foxLargeSway {
  0% {
    transform: translateY(-55px) translateX(-45px) scale(1.08) rotate(-3.5deg);
  }
  35% {
    transform: translateY(45px) translateX(35px) scale(1.15) rotate(3deg);
  }
  70% {
    transform: translateY(-25px) translateX(55px) scale(1.06) rotate(1.5deg);
  }
  100% {
    transform: translateY(50px) translateX(-30px) scale(1.13) rotate(-2.5deg);
  }
}

/* 灵狐尾气狐火光晕脉冲 */
@keyframes foxGlowPulse {
  0% {
    opacity: 0.28;
    transform: scale(1.03) rotate(2deg);
    filter: blur(25px) brightness(1.3) saturate(1.5);
  }
  50% {
    opacity: 0.55;
    transform: scale(1.18) rotate(-3deg);
    filter: blur(38px) brightness(1.8) saturate(1.9) hue-rotate(18deg);
  }
  100% {
    opacity: 0.32;
    transform: scale(1.07) rotate(2.5deg);
    filter: blur(30px) brightness(1.4) saturate(1.6);
  }
}

/* 动态背景画布 */
#bg-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -2;
  pointer-events: none;
}

/* 容器与布局 */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

/* 排版与公用类 */
a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

.text-gradient {
  background: linear-gradient(135deg, #38bdf8 0%, #818cf8 50%, #c084fc 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.85rem;
  font-size: 0.825rem;
  font-weight: 600;
  border-radius: 9999px;
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.25);
  color: var(--primary);
  letter-spacing: 0.5px;
}

.badge-fire {
  background: rgba(244, 63, 94, 0.12);
  border-color: rgba(244, 63, 94, 0.3);
  color: #fb7185;
}

.section-header {
  text-align: center;
  max-width: 820px;
  margin: 0 auto 3.5rem auto;
}

.section-tag {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 0.75rem;
}

.section-title {
  font-size: 2.35rem;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 1rem;
  color: #ffffff;
}

.section-desc {
  font-size: 1.1rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ===================================================================
   导航栏 Navbar - 严格文字并行排版规范
   =================================================================== */
.navbar {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(8, 12, 20, 0.88);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
  transition: all var(--transition-normal);
}

.navbar.scrolled {
  background: rgba(8, 12, 20, 0.96);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  gap: 1.5rem;
  white-space: nowrap;
}

/* 左侧 Logo 区域 - 纯净图标 + 品牌文字 */
.logo-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  flex-shrink: 0;
  white-space: nowrap;
}

.logo-img-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 44px;
}

.logo-img {
  height: 42px;
  width: auto;
  max-width: 52px;
  object-fit: contain;
  filter: drop-shadow(0 0 12px rgba(56, 189, 248, 0.5));
}

.logo-text-group {
  display: flex;
  flex-direction: column;
  white-space: nowrap;
}

.logo-title {
  font-size: 1.3rem;
  font-weight: 900;
  color: #ffffff;
  letter-spacing: 0.5px;
  line-height: 1.1;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  white-space: nowrap;
}

.logo-title span {
  color: var(--primary);
  font-size: 0.9em;
}

.logo-sub {
  font-size: 0.7rem;
  color: var(--text-dim);
  font-weight: 600;
  letter-spacing: 0.8px;
  white-space: nowrap;
}

/* 导航链接 - 核心优化：文字必须并行，绝对禁止折行 */
.nav-menu {
  display: flex;
  align-items: center;
  gap: 1.35rem;
  white-space: nowrap;
  flex-shrink: 1;
}

.nav-link {
  font-size: 0.925rem;
  font-weight: 600;
  color: var(--text-muted);
  position: relative;
  padding: 0.5rem 0;
  white-space: nowrap !important; /* 强制文字并行，杜绝核心优势/套餐价格折行 */
  display: inline-block;
  letter-spacing: 0.3px;
  transition: color var(--transition-fast);
}

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

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: width var(--transition-fast);
  border-radius: 2px;
}

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

/* 导航按钮 */
.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
  white-space: nowrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  font-size: 0.925rem;
  font-weight: 700;
  padding: 0.55rem 1.25rem;
  border-radius: 10px;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all var(--transition-fast);
  white-space: nowrap !important;
  flex-shrink: 0;
}

.btn-primary {
  background: linear-gradient(135deg, #0284c7 0%, #38bdf8 100%);
  color: #ffffff;
  box-shadow: 0 4px 20px rgba(56, 189, 248, 0.35);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #0369a1 0%, #0ea5e9 100%);
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(56, 189, 248, 0.5);
}

.btn-secondary {
  background: rgba(30, 41, 59, 0.6);
  border-color: var(--border-subtle);
  color: var(--text-main);
  backdrop-filter: blur(8px);
}

.btn-secondary:hover {
  background: rgba(51, 65, 85, 0.8);
  border-color: var(--primary);
  color: #ffffff;
}

.btn-pulse {
  animation: pulse-glow 2.5s infinite;
}

@keyframes pulse-glow {
  0%, 100% {
    box-shadow: 0 4px 20px rgba(56, 189, 248, 0.35);
  }
  50% {
    box-shadow: 0 4px 30px rgba(168, 85, 247, 0.65);
  }
}

/* 移动端菜单按钮 */
.menu-toggle {
  display: none;
  background: transparent;
  border: none;
  color: var(--text-main);
  cursor: pointer;
  padding: 0.5rem;
  font-size: 1.5rem;
}

/* ===================================================================
   Hero 头部首屏
   =================================================================== */
.hero-section {
  position: relative;
  padding: 6rem 0 5rem 0;
  overflow: hidden;
  text-align: center;
}

.hero-content {
  max-width: 900px;
  margin: 0 auto;
}

.hero-badge-wrap {
  display: flex;
  justify-content: center;
  margin-bottom: 1.75rem;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 1.5rem;
  letter-spacing: -0.5px;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 2.5rem;
  max-width: 760px;
  margin-left: auto;
  margin-right: auto;
}

.hero-actions {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1.25rem;
  margin-bottom: 3.5rem;
  flex-wrap: wrap;
}

.hero-actions .btn {
  padding: 0.85rem 2rem;
  font-size: 1.05rem;
  border-radius: 12px;
}

/* Hero 数据统计条 */
.hero-stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-subtle);
  border-radius: 18px;
  padding: 1.75rem 2rem;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.stat-item {
  text-align: center;
  border-right: 1px solid var(--border-subtle);
}

.stat-item:last-child {
  border-right: none;
}

.stat-num {
  font-size: 2rem;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 0.25rem;
}

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

/* ===================================================================
   特性优势 Features
   =================================================================== */
.features-section {
  padding: 5rem 0;
  position: relative;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
}

.feature-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-subtle);
  border-radius: 16px;
  padding: 2.25rem 1.75rem;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--primary), transparent);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.feature-card:hover {
  transform: translateY(-5px);
  border-color: var(--border-glow);
  background: var(--bg-card-hover);
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.4), 0 0 20px var(--primary-glow);
}

.feature-card:hover::before {
  opacity: 1;
}

.feature-icon-box {
  width: 54px;
  height: 54px;
  border-radius: 14px;
  background: rgba(56, 189, 248, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  margin-bottom: 1.25rem;
  color: var(--primary);
}

.feature-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 0.75rem;
}

.feature-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* ===================================================================
   价格区域：所有价格严格同排展示 (Desktop & Horizontal Responsive)
   =================================================================== */
.pricing-section {
  padding: 5rem 0 6rem 0;
  position: relative;
}

.pricing-tabs {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 2.5rem;
}

.pricing-tab-btn {
  padding: 0.65rem 1.5rem;
  font-size: 0.95rem;
  font-weight: 700;
  border-radius: 9999px;
  border: 1px solid var(--border-subtle);
  background: rgba(15, 23, 42, 0.6);
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.pricing-tab-btn:hover {
  color: #ffffff;
  border-color: var(--primary);
}

.pricing-tab-btn.active {
  background: var(--primary);
  color: #0b0f19;
  border-color: var(--primary);
  box-shadow: 0 0 20px var(--primary-glow);
}

.pricing-banner-hint {
  text-align: center;
  margin-bottom: 2rem;
  font-size: 0.9rem;
  color: var(--primary);
  background: rgba(56, 189, 248, 0.08);
  border: 1px dashed rgba(56, 189, 248, 0.3);
  padding: 0.75rem 1.5rem;
  border-radius: 12px;
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
}

/* 核心要求：所有价格同排展示 */
.pricing-grid-same-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  border: 1px solid var(--border-subtle);
  border-radius: 20px;
  padding: 2.25rem 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  transition: all var(--transition-normal);
}

.pricing-card:hover {
  transform: translateY(-8px);
  border-color: var(--border-glow);
  background: var(--bg-card-hover);
  box-shadow: 0 20px 45px rgba(0, 0, 0, 0.5), 0 0 25px var(--primary-glow);
}

/* 热门推荐高亮卡片 */
.pricing-card.featured {
  background: linear-gradient(180deg, rgba(30, 41, 59, 0.85) 0%, rgba(15, 23, 42, 0.95) 100%);
  border: 2px solid var(--primary);
  box-shadow: 0 15px 40px rgba(56, 189, 248, 0.25);
}

.pricing-card.featured::after {
  content: "HOT · 爆款推荐";
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(90deg, #0284c7, #38bdf8);
  color: #ffffff;
  font-size: 0.75rem;
  font-weight: 800;
  padding: 0.3rem 0.9rem;
  border-radius: 9999px;
  letter-spacing: 0.5px;
  box-shadow: 0 4px 15px rgba(56, 189, 248, 0.5);
  white-space: nowrap;
}

.pricing-badge {
  display: inline-block;
  align-self: flex-start;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.25rem 0.65rem;
  border-radius: 6px;
  background: rgba(148, 163, 184, 0.12);
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.pricing-card.featured .pricing-badge {
  background: rgba(56, 189, 248, 0.15);
  color: var(--primary);
}

.plan-name {
  font-size: 1.45rem;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 0.35rem;
}

.plan-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  min-height: 2.4em;
  margin-bottom: 1.25rem;
  line-height: 1.4;
}

.plan-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 0.25rem;
  margin-bottom: 1.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-subtle);
}

.currency {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--primary);
}

.price-num {
  font-size: 2.75rem;
  font-weight: 900;
  color: #ffffff;
  line-height: 1;
}

.period {
  font-size: 0.9rem;
  color: var(--text-dim);
  font-weight: 600;
}

.plan-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  margin-bottom: 2rem;
  flex-grow: 1;
}

.plan-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 0.65rem;
  font-size: 0.875rem;
  color: #cbd5e1;
  line-height: 1.4;
}

.feature-check {
  color: #10b981;
  font-size: 1rem;
  font-weight: 800;
  flex-shrink: 0;
  margin-top: 1px;
}

.feature-cross {
  color: #ef4444;
  font-size: 0.95rem;
  font-weight: 700;
  flex-shrink: 0;
  opacity: 0.6;
}

.pricing-cta {
  width: 100%;
  padding: 0.85rem 1rem;
  border-radius: 10px;
  font-size: 0.95rem;
  font-weight: 700;
  text-align: center;
  display: block;
}

/* ===================================================================
   节点网络与协议支持
   =================================================================== */
.network-section {
  padding: 5rem 0;
  position: relative;
}

.node-tags-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.85rem;
  margin-top: 2rem;
}

.node-tag {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  padding: 0.6rem 1.25rem;
  border-radius: 9999px;
  font-size: 0.9rem;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: all var(--transition-fast);
}

.node-tag:hover {
  border-color: var(--primary);
  transform: translateY(-2px);
  background: var(--bg-card-hover);
}

.node-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #10b981;
  box-shadow: 0 0 8px #10b981;
}

/* 客户端下载区域 */
.clients-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
  margin-top: 3rem;
}

.client-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 14px;
  padding: 1.75rem 1.25rem;
  text-align: center;
  transition: all var(--transition-fast);
}

.client-card:hover {
  border-color: var(--primary);
  transform: translateY(-4px);
  background: var(--bg-card-hover);
}

.client-icon {
  font-size: 2.2rem;
  margin-bottom: 0.75rem;
}

.client-name {
  font-size: 1.1rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 0.35rem;
}

.client-sub {
  font-size: 0.825rem;
  color: var(--text-dim);
  margin-bottom: 1rem;
}

.client-download-link {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.client-download-link:hover {
  text-decoration: underline;
}

/* ===================================================================
   精选文章专栏 (Articles Section)
   =================================================================== */
.articles-section {
  padding: 5rem 0;
  position: relative;
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
}

.article-card {
  background: var(--bg-card);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border-subtle);
  border-radius: 16px;
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-normal);
}

.article-card:hover {
  transform: translateY(-5px);
  border-color: var(--primary);
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.4);
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-bottom: 0.85rem;
}

.article-tag {
  color: var(--primary);
  background: rgba(56, 189, 248, 0.1);
  padding: 0.2rem 0.55rem;
  border-radius: 4px;
  font-weight: 600;
}

.article-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: #ffffff;
  line-height: 1.45;
  margin-bottom: 0.75rem;
}

.article-card-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 1.25rem;
}

.article-card-link {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  align-self: flex-start;
}

.article-card-link:hover {
  color: #ffffff;
}

/* ===================================================================
   用户真实评价 (Reviews / Testimonials)
   =================================================================== */
.reviews-section {
  padding: 5rem 0;
  position: relative;
}

.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
}

.review-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-subtle);
  border-radius: 16px;
  padding: 2rem 1.75rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-normal);
}

.review-card:hover {
  transform: translateY(-5px);
  border-color: var(--border-glow);
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.4);
}

.review-stars {
  color: #f59e0b;
  font-size: 1.1rem;
  letter-spacing: 2px;
  margin-bottom: 1rem;
}

.review-text {
  font-size: 0.95rem;
  color: #cbd5e1;
  line-height: 1.7;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  border-top: 1px solid var(--border-subtle);
  padding-top: 1rem;
}

.author-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.1rem;
}

.author-info {
  display: flex;
  flex-direction: column;
}

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

.author-role {
  font-size: 0.775rem;
  color: var(--text-dim);
}

/* ===================================================================
   常见问题 FAQ
   =================================================================== */
.faq-section {
  padding: 5rem 0 6rem 0;
  position: relative;
}

.faq-accordion {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.faq-item {
  background: var(--bg-card);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border-subtle);
  border-radius: 14px;
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

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

.faq-question {
  width: 100%;
  padding: 1.25rem 1.5rem;
  background: transparent;
  border: none;
  text-align: left;
  font-size: 1.05rem;
  font-weight: 700;
  color: #ffffff;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  transition: color var(--transition-fast);
}

.faq-icon {
  font-size: 1.35rem;
  color: var(--primary);
  transition: transform var(--transition-fast);
}

.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 1.5rem;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  max-height: 500px;
  padding: 0 1.5rem 1.35rem 1.5rem;
}

/* ===================================================================
   底部外链与友情链接 (External & Friendly Links)
   =================================================================== */
.links-section {
  padding: 3.5rem 0;
  background: rgba(11, 15, 25, 0.75);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.links-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
}

.links-group-title {
  font-size: 0.95rem;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 1rem;
  letter-spacing: 0.5px;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.links-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.links-list a {
  font-size: 0.875rem;
  color: var(--text-muted);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.links-list a:hover {
  color: var(--primary);
  text-decoration: underline;
}

/* ===================================================================
   页脚 Footer
   =================================================================== */
.footer {
  padding: 4rem 0 2rem 0;
  background: #05080e;
  color: var(--text-muted);
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-brand-desc {
  font-size: 0.9rem;
  color: var(--text-dim);
  margin-top: 1rem;
  line-height: 1.7;
  max-width: 360px;
}

.footer-col-title {
  font-size: 1rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 1.25rem;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-links a {
  font-size: 0.875rem;
  color: var(--text-muted);
}

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

.footer-bottom {
  border-top: 1px solid var(--border-subtle);
  padding-top: 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  color: var(--text-dim);
}

/* ===================================================================
   文章内页专用排版样式 (Article Single Page)
   =================================================================== */
.article-header {
  padding: 4.5rem 0 2rem 0;
  text-align: center;
}

.article-content-container {
  max-width: 880px;
  margin: 0 auto;
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-subtle);
  border-radius: 20px;
  padding: 3rem 2.5rem;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.article-body {
  font-size: 1.05rem;
  line-height: 1.85;
  color: #cbd5e1;
}

.article-body h2 {
  font-size: 1.75rem;
  font-weight: 800;
  color: #ffffff;
  margin: 2.25rem 0 1rem 0;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-subtle);
}

.article-body h3 {
  font-size: 1.35rem;
  font-weight: 700;
  color: #38bdf8;
  margin: 1.75rem 0 0.75rem 0;
}

.article-body p {
  margin-bottom: 1.25rem;
}

.article-body ul, .article-body ol {
  margin: 1rem 0 1.5rem 1.5rem;
}

.article-body li {
  margin-bottom: 0.5rem;
}

.article-body blockquote {
  border-left: 4px solid var(--primary);
  background: rgba(56, 189, 248, 0.08);
  padding: 1rem 1.25rem;
  border-radius: 0 8px 8px 0;
  margin: 1.5rem 0;
  color: #e2e8f0;
}

.article-body a {
  color: var(--primary);
  text-decoration: underline;
  font-weight: 600;
}

.article-callout-box {
  background: linear-gradient(135deg, rgba(2, 132, 199, 0.15) 0%, rgba(168, 85, 247, 0.15) 100%);
  border: 1px solid rgba(56, 189, 248, 0.3);
  border-radius: 14px;
  padding: 1.5rem 2rem;
  text-align: center;
  margin: 2.5rem 0;
}

.article-callout-box h3 {
  color: #ffffff;
  margin-top: 0;
  margin-bottom: 0.5rem;
}

.article-nav-links {
  display: flex;
  justify-content: space-between;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-subtle);
  flex-wrap: wrap;
  gap: 1rem;
}

/* ===================================================================
   移动端与平板响应式适配 (Mobile & Tablet Responsiveness)
   =================================================================== */
@media (max-width: 1240px) {
  .nav-menu {
    gap: 0.95rem;
  }
  .nav-link {
    font-size: 0.875rem;
  }
  .nav-actions {
    gap: 0.5rem;
  }
  .nav-actions .btn {
    padding: 0.5rem 0.95rem;
    font-size: 0.85rem;
  }
  .logo-title {
    font-size: 1.15rem;
  }
  .logo-sub {
    display: none; /* 紧凑屏幕下隐藏微小副标，给菜单让出充裕水平空间 */
  }
}

@media (max-width: 1024px) {
  .nav-menu {
    position: fixed;
    top: 72px;
    left: 0;
    width: 100%;
    height: calc(100vh - 72px);
    background: rgba(8, 12, 20, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 2.5rem 2rem;
    gap: 1.75rem;
    transform: translateX(100%);
    transition: transform var(--transition-normal);
    overflow-y: auto;
    white-space: normal;
  }

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

  .nav-link {
    font-size: 1.1rem;
    padding: 0.5rem 0;
  }

  .menu-toggle {
    display: block;
  }

  .nav-actions {
    display: none;
  }

  .nav-menu .mobile-action-btn {
    display: block;
    width: 100%;
    margin-top: 1rem;
  }

  .hero-title {
    font-size: 2.75rem;
  }
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-grid-same-row {
    grid-template-columns: repeat(2, 1fr);
  }
  .clients-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .links-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-top {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {

  .hero-section {
    padding: 4rem 0 3.5rem 0;
  }

  .hero-title {
    font-size: 2.15rem;
  }

  .hero-subtitle {
    font-size: 1rem;
  }

  .hero-stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    padding: 1.25rem 1rem;
  }

  .stat-item {
    border-right: none;
  }

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

  /* 移动端价格：支持横向无缝滑动，同排对比体验极致 */
  .pricing-grid-same-row {
    display: flex;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    gap: 1rem;
    padding-bottom: 1.5rem;
    -webkit-overflow-scrolling: touch;
  }

  .pricing-card {
    min-width: 275px;
    flex: 0 0 280px;
    scroll-snap-align: start;
  }

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

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

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

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

  .footer-top {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }

  .article-content-container {
    padding: 1.75rem 1.25rem;
  }
}