/* ==========================================================================
   灯塔VPN (Dengta Cloud) - 官方网站核心样式表
   特性：纯原生 CSS3、零外部重量级框架、秒开极致性能、深海灯塔美学
   ========================================================================== */

:root {
  /* 品牌色盘 - 灯塔深海与探照金光 */
  --bg-primary: #060a12;
  --bg-secondary: #0c1424;
  --bg-card: rgba(15, 23, 42, 0.75);
  --bg-card-hover: rgba(26, 38, 66, 0.85);
  --bg-glass: rgba(15, 23, 42, 0.65);
  
  --primary: #38bdf8;
  --primary-hover: #0284c7;
  --primary-glow: rgba(56, 189, 248, 0.35);
  
  --accent-gold: #fbbf24;
  --accent-gold-glow: rgba(251, 191, 36, 0.3);
  --accent-cyan: #06b6d4;
  --accent-blue: #2563eb;
  --accent-green: #10b981;
  --accent-purple: #8b5cf6;
  
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-gold: #fde68a;
  
  --border-light: rgba(255, 255, 255, 0.08);
  --border-focus: rgba(56, 189, 248, 0.45);
  --border-gold: rgba(251, 191, 36, 0.4);
  
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  
  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.25);
  --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 0 25px rgba(56, 189, 248, 0.25);
  --shadow-gold-glow: 0 0 25px rgba(251, 191, 36, 0.25);
  
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
  --container-max: 1240px;
  --transition: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-size: 16px;
  line-height: 1.6;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  background-color: var(--bg-primary);
}

/* 动态 Canvas 背景全屏铺底 */
#dynamic-bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
  opacity: 0.9;
}

/* 页面内容包裹器 */
.site-wrapper {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

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

/* 链接样式 */
a {
  color: var(--primary);
  text-decoration: none;
  transition: var(--transition);
}

a:hover {
  color: #7dd3fc;
}

/* 顶部固定导航栏 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: rgba(6, 10, 18, 0.82);
  border-bottom: 1px solid var(--border-light);
  transition: var(--transition);
}

.site-header.scrolled {
  background: rgba(6, 10, 18, 0.95);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
  border-bottom-color: rgba(56, 189, 248, 0.2);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}

/* 顶部左侧 Logo 展现 */
.logo-link {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.logo-svg {
  height: 44px;
  width: auto;
  display: block;
  filter: drop-shadow(0 0 12px rgba(139, 92, 246, 0.35));
  transition: var(--transition);
}

.logo-link:hover .logo-svg {
  filter: drop-shadow(0 0 18px rgba(139, 92, 246, 0.6));
  transform: translateY(-1px);
}

/* 导航链接 */
.nav-menu {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 32px;
}

.nav-link {
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 8px 4px;
  position: relative;
  transition: var(--transition);
}

.nav-link:hover,
.nav-link.active {
  color: var(--text-primary);
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background: linear-gradient(90deg, var(--primary), var(--accent-gold));
  transition: width 0.25s ease;
  border-radius: 2px;
}

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

.nav-tag {
  display: inline-block;
  font-size: 0.68rem;
  font-weight: 700;
  padding: 1px 6px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, #f59e0b, #d97706);
  color: #fff;
  margin-left: 4px;
  vertical-align: middle;
}

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

/* 移动端菜单按钮 */
.mobile-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--border-light);
  color: var(--text-primary);
  width: 42px;
  height: 42px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
}

.mobile-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--text-primary);
  transition: var(--transition);
}

/* 按钮基础规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 12px 26px;
  border-radius: var(--radius-full);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, #0284c7 0%, #2563eb 50%, #1d4ed8 100%);
  color: #ffffff;
  box-shadow: 0 4px 20px rgba(37, 99, 235, 0.45);
  border: 1px solid rgba(56, 189, 248, 0.35);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #0369a1 0%, #1d4ed8 50%, #1e40af 100%);
  box-shadow: 0 6px 26px rgba(56, 189, 248, 0.6);
  transform: translateY(-2px);
  color: #ffffff;
}

.btn-gold {
  background: linear-gradient(135deg, #fbbf24 0%, #f59e0b 50%, #d97706 100%);
  color: #0f172a;
  font-weight: 700;
  box-shadow: 0 4px 20px rgba(245, 158, 11, 0.45);
  border: 1px solid rgba(254, 240, 138, 0.4);
}

.btn-gold:hover {
  background: linear-gradient(135deg, #fcd34d 0%, #fbbf24 50%, #d97706 100%);
  box-shadow: 0 6px 28px rgba(251, 191, 36, 0.65);
  transform: translateY(-2px);
  color: #020617;
}

.btn-secondary {
  background: rgba(15, 23, 42, 0.7);
  color: var(--text-primary);
  border: 1px solid var(--border-light);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: rgba(30, 41, 59, 0.9);
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-2px);
}

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

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

.btn-glow {
  animation: pulseGlow 3s infinite;
}

@keyframes pulseGlow {
  0%, 100% {
    box-shadow: 0 0 16px rgba(56, 189, 248, 0.35);
  }
  50% {
    box-shadow: 0 0 28px rgba(56, 189, 248, 0.7);
  }
}

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

.hero-badge-wrap {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 16px;
  background: rgba(56, 189, 248, 0.08);
  border: 1px solid rgba(56, 189, 248, 0.25);
  border-radius: var(--radius-full);
  margin-bottom: 24px;
  backdrop-filter: blur(8px);
}

.hero-badge-dot {
  width: 8px;
  height: 8px;
  background-color: #10b981;
  border-radius: 50%;
  box-shadow: 0 0 10px #10b981;
  animation: blinkDot 1.8s infinite ease-in-out;
}

@keyframes blinkDot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.75); }
}

.hero-badge-text {
  font-size: 0.88rem;
  color: var(--text-primary);
  font-weight: 500;
}

.hero-title {
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.02em;
  margin-bottom: 22px;
  max-width: 980px;
  margin-left: auto;
  margin-right: auto;
}

.gradient-text-sky {
  background: linear-gradient(135deg, #ffffff 15%, #38bdf8 55%, #60a5fa 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.gradient-text-gold {
  background: linear-gradient(135deg, #fbbf24 20%, #f59e0b 60%, #fde68a 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: clamp(1rem, 2vw, 1.22rem);
  color: var(--text-secondary);
  max-width: 820px;
  margin: 0 auto 36px;
  line-height: 1.7;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.hero-meta-badges {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 30px;
  flex-wrap: wrap;
  padding-top: 18px;
  border-top: 1px solid var(--border-light);
  max-width: 780px;
  margin: 0 auto 60px;
}

.meta-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.meta-item svg {
  color: var(--accent-gold);
  flex-shrink: 0;
}

/* 核心指标统计带 */
.stats-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 30px 24px;
  box-shadow: var(--shadow-md);
  margin-bottom: 70px;
}

.stat-box {
  text-align: center;
  position: relative;
}

.stat-box:not(:last-child)::after {
  content: "";
  position: absolute;
  right: -10px;
  top: 15%;
  height: 70%;
  width: 1px;
  background: var(--border-light);
}

.stat-num {
  font-size: 2.3rem;
  font-weight: 800;
  color: #ffffff;
  line-height: 1.2;
  margin-bottom: 6px;
  font-feature-settings: "tnum";
}

.stat-num span {
  color: var(--primary);
  font-size: 1.5rem;
}

.stat-label {
  font-size: 0.9rem;
  color: var(--text-secondary);
  font-weight: 500;
}

/* ==========================================================================
   板块公用标题
   ========================================================================== */
.section-wrap {
  padding: 70px 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 780px;
  margin: 0 auto 48px;
}

.section-tag {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--primary);
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.25);
  padding: 4px 14px;
  border-radius: var(--radius-full);
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  font-weight: 800;
  color: #ffffff;
  line-height: 1.25;
  margin-bottom: 14px;
  letter-spacing: -0.01em;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.68;
}

/* ==========================================================================
   优势卡片网格 (Features)
   ========================================================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 32px 28px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

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

.feature-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-focus);
  transform: translateY(-5px);
  box-shadow: var(--shadow-glow);
}

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

.feature-icon-wrap {
  width: 54px;
  height: 54px;
  border-radius: var(--radius-md);
  background: rgba(56, 189, 248, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  margin-bottom: 22px;
  transition: var(--transition);
}

.feature-card:hover .feature-icon-wrap {
  background: rgba(56, 189, 248, 0.22);
  transform: scale(1.08);
  border-color: var(--primary);
}

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

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

/* ==========================================================================
   【重点】价格套餐板块 - 要求所有价格同排 (Same Row Pricing)
   ========================================================================== */
.pricing-section {
  position: relative;
  padding: 80px 0;
  background: linear-gradient(180deg, transparent 0%, rgba(12, 20, 36, 0.5) 50%, transparent 100%);
}

.pricing-header-note {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(251, 191, 36, 0.12);
  border: 1px solid var(--border-gold);
  padding: 6px 18px;
  border-radius: var(--radius-full);
  color: var(--accent-gold);
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 20px;
}

/* 核心：所有价格卡片同排显示 (5张卡片并列) */
.pricing-grid-same-row {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
  align-items: stretch;
  width: 100%;
}

.price-card {
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 28px 20px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition);
  position: relative;
  min-height: 520px;
}

.price-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-focus);
  box-shadow: var(--shadow-glow);
  background: var(--bg-card-hover);
}

/* 热门推荐卡片视觉强化 */
.price-card.featured {
  border-color: rgba(251, 191, 36, 0.6);
  background: linear-gradient(180deg, rgba(30, 41, 59, 0.9) 0%, rgba(15, 23, 42, 0.85) 100%);
  box-shadow: 0 0 30px rgba(251, 191, 36, 0.22);
  transform: translateY(-8px);
}

.price-card.featured:hover {
  transform: translateY(-12px);
  box-shadow: 0 0 40px rgba(251, 191, 36, 0.4);
}

.card-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, #f59e0b, #d97706);
  color: #0f172a;
  font-size: 0.72rem;
  font-weight: 800;
  padding: 3px 12px;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 1px;
  box-shadow: 0 2px 10px rgba(245, 158, 11, 0.4);
  white-space: nowrap;
}

.price-card-header {
  text-align: center;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--border-light);
}

.plan-name {
  font-size: 1.22rem;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 6px;
}

.plan-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
  min-height: 38px;
  line-height: 1.4;
}

.plan-price-wrap {
  margin: 16px 0 10px;
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 2px;
}

.price-currency {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--primary);
}

.price-amount {
  font-size: 2.4rem;
  font-weight: 900;
  color: #ffffff;
  line-height: 1;
  font-feature-settings: "tnum";
}

.price-card.featured .price-amount,
.price-card.featured .price-currency {
  color: var(--accent-gold);
}

.price-period {
  font-size: 0.82rem;
  color: var(--text-secondary);
}

.plan-traffic-pill {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  background: rgba(56, 189, 248, 0.12);
  color: var(--primary);
  border: 1px solid rgba(56, 189, 248, 0.25);
  margin-top: 4px;
}

.price-card.featured .plan-traffic-pill {
  background: rgba(251, 191, 36, 0.15);
  color: var(--accent-gold);
  border-color: rgba(251, 191, 36, 0.35);
}

/* 套餐特性清单 */
.plan-features {
  list-style: none;
  padding: 20px 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
  flex-grow: 1;
}

.feature-check-item {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.4;
}

.feature-check-item svg {
  color: #10b981;
  flex-shrink: 0;
  margin-top: 2px;
}

.feature-check-item.highlight {
  color: #ffffff;
  font-weight: 600;
}

.feature-check-item.highlight svg {
  color: var(--accent-gold);
}

.plan-action {
  margin-top: auto;
  padding-top: 16px;
}

.plan-action .btn {
  width: 100%;
}

/* ==========================================================================
   客户端支持与协议矩阵
   ========================================================================== */
.clients-section {
  padding: 60px 0;
}

.clients-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.client-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 24px;
  text-align: center;
  transition: var(--transition);
}

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

.client-card-icon {
  width: 50px;
  height: 50px;
  margin: 0 auto 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background: rgba(56, 189, 248, 0.1);
  color: var(--primary);
}

.client-name {
  font-size: 1.1rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 6px;
}

.client-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* ==========================================================================
   文章专栏导流板块 (SEO Articles Showcase)
   ========================================================================== */
.articles-section {
  padding: 70px 0;
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 26px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition);
  text-decoration: none;
}

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

.article-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.article-cat {
  background: rgba(56, 189, 248, 0.12);
  color: var(--primary);
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 600;
}

.article-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: #ffffff;
  line-height: 1.45;
  margin-bottom: 12px;
}

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

.article-card-excerpt {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 18px;
}

.article-read-more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--primary);
}

/* ==========================================================================
   用户真实评价板块 (Testimonials)
   ========================================================================== */
.reviews-section {
  padding: 70px 0;
  background: rgba(12, 20, 36, 0.4);
}

.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition);
}

.review-card:hover {
  background: var(--bg-card-hover);
  border-color: rgba(56, 189, 248, 0.3);
  transform: translateY(-4px);
}

.review-stars {
  color: #fbbf24;
  display: flex;
  gap: 3px;
  margin-bottom: 14px;
}

.review-content {
  font-size: 0.94rem;
  color: #e2e8f0;
  line-height: 1.68;
  margin-bottom: 20px;
  font-style: normal;
}

.review-user-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-top: 14px;
  border-top: 1px solid var(--border-light);
}

.user-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, #0284c7, #2563eb);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  color: #ffffff;
  font-size: 1rem;
}

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

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

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

/* ==========================================================================
   常见问题板块 (FAQ Accordion)
   ========================================================================== */
.faq-section {
  padding: 70px 0;
}

.faq-list {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

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

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

.faq-question {
  width: 100%;
  background: transparent;
  border: none;
  padding: 22px 26px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  text-align: left;
  font-family: inherit;
  font-size: 1.05rem;
  font-weight: 700;
  color: #ffffff;
  gap: 16px;
}

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

.faq-icon {
  width: 22px;
  height: 22px;
  flex-shrink: 0;
  color: var(--primary);
  transition: transform 0.28s ease;
}

.faq-item.active .faq-icon {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
  padding: 0 26px;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.75;
}

.faq-item.active .faq-answer {
  max-height: 400px;
  padding: 0 26px 22px;
}

.faq-answer p:not(:last-child) {
  margin-bottom: 12px;
}

/* ==========================================================================
   权威外链与生态参考板块 (Authority External Links)
   ========================================================================== */
.external-links-section {
  padding: 40px 0 60px;
  border-top: 1px solid var(--border-light);
}

.external-links-wrap {
  background: rgba(15, 23, 42, 0.5);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 24px 30px;
}

.external-links-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-secondary);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.external-links-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
}

.external-link-item {
  color: var(--text-muted);
  font-size: 0.85rem;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  transition: var(--transition);
}

.external-link-item:hover {
  color: var(--primary);
  text-decoration: underline;
}

/* ==========================================================================
   底部页脚 (Footer)
   ========================================================================== */
.site-footer {
  background: #04070d;
  border-top: 1px solid var(--border-light);
  padding: 60px 0 30px;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 40px;
  margin-bottom: 48px;
}

.footer-brand-desc {
  color: var(--text-muted);
  font-size: 0.88rem;
  line-height: 1.65;
  margin-top: 16px;
  max-width: 320px;
}

.footer-col-title {
  font-size: 1rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 18px;
  letter-spacing: 0.5px;
}

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

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

.footer-links a:hover {
  color: var(--primary);
  padding-left: 3px;
}

.footer-bottom {
  padding-top: 28px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* ==========================================================================
   响应式断点适配
   ========================================================================== */
@media (max-width: 1200px) {
  .pricing-grid-same-row {
    gap: 12px;
  }
  .price-card {
    padding: 24px 14px;
  }
  .price-amount {
    font-size: 2.1rem;
  }
}

@media (max-width: 1024px) {
  /* 当屏幕较窄时，价格横向排版支持优雅换行，仍然保持同排视觉对齐 */
  .pricing-grid-same-row {
    grid-template-columns: repeat(3, 1fr);
  }
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .stats-strip {
    grid-template-columns: repeat(2, 1fr);
    gap: 28px;
  }
  .stat-box:nth-child(2)::after {
    display: none;
  }
  .clients-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-top {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .header-container {
    height: 68px;
  }
  .nav-menu {
    position: fixed;
    top: 68px;
    left: 0;
    width: 100%;
    background: rgba(6, 10, 18, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 30px 24px;
    gap: 20px;
    border-bottom: 1px solid var(--border-light);
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: var(--transition);
  }
  .nav-menu.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .mobile-toggle {
    display: flex;
  }
  .pricing-grid-same-row {
    grid-template-columns: 1fr;
    max-width: 420px;
    margin: 0 auto;
  }
  .price-card {
    min-height: auto;
  }
  .features-grid {
    grid-template-columns: 1fr;
  }
  .stats-strip {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .stat-box::after {
    display: none !important;
  }
  .clients-grid {
    grid-template-columns: 1fr;
  }
  .articles-grid {
    grid-template-columns: 1fr;
  }
  .reviews-grid {
    grid-template-columns: 1fr;
  }
  .footer-top {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}