/* ==========================================================================
   扬帆云 (YangFanYun) - 官方网站样式表
   域名: yfcloud.cyou | 全球加速 · 安全专线 · 极速出海
   ========================================================================== */

:root {
  --bg-primary: #060913;
  --bg-secondary: #0b1120;
  --bg-card: rgba(16, 24, 48, 0.75);
  --bg-card-hover: rgba(26, 38, 74, 0.85);
  --border-color: rgba(99, 102, 241, 0.18);
  --border-glow: rgba(56, 189, 248, 0.4);
  
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  
  --accent-cyan: #38bdf8;
  --accent-blue: #3b82f6;
  --accent-purple: #8b5cf6;
  --accent-pink: #ec4899;
  --accent-emerald: #10b981;
  --accent-amber: #f59e0b;
  
  --gradient-brand: linear-gradient(135deg, #38bdf8 0%, #6366f1 50%, #a855f7 100%);
  --gradient-card: linear-gradient(180deg, rgba(30, 41, 69, 0.6) 0%, rgba(15, 23, 42, 0.8) 100%);
  --gradient-btn: linear-gradient(135deg, #0ea5e9 0%, #6366f1 100%);
  --gradient-btn-hover: linear-gradient(135deg, #38bdf8 0%, #818cf8 100%);

  --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 25px rgba(56, 189, 248, 0.25);
  --shadow-card: 0 10px 30px -5px rgba(0, 0, 0, 0.5);

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --container-max: 1320px;
  --radius-lg: 16px;
  --radius-md: 10px;
  --radius-sm: 6px;
}

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

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

body {
  position: relative;
  min-height: 100vh;
  overflow-x: hidden;
  background: radial-gradient(circle at 50% 0%, #172554 0%, #060913 65%);
}

/* 扬帆云品牌背景装饰氛围 (云涌与星海极光) */
body::before {
  content: '';
  position: fixed;
  top: -12%;
  right: -8%;
  width: 650px;
  height: 650px;
  background: radial-gradient(circle, rgba(56, 189, 248, 0.14) 0%, rgba(99, 102, 241, 0.06) 50%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
  z-index: 0;
  filter: blur(70px);
}

body::after {
  content: '';
  position: fixed;
  bottom: -10%;
  left: -10%;
  width: 750px;
  height: 750px;
  background: radial-gradient(circle, rgba(168, 85, 247, 0.12) 0%, rgba(14, 165, 233, 0.05) 50%, transparent 75%);
  border-radius: 50%;
  pointer-events: none;
  z-index: 0;
  filter: blur(85px);
}

/* 动态背景画布 */
#dynamic-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
  opacity: 0.85;
}

.content-wrapper {
  position: relative;
  z-index: 1;
}

a {
  color: var(--accent-cyan);
  text-decoration: none;
  transition: all 0.25s ease;
}

a:hover {
  color: #7dd3fc;
  text-shadow: 0 0 10px rgba(56, 189, 248, 0.5);
}

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

/* 导航栏 */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: rgba(6, 9, 19, 0.78);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  transition: all 0.3s ease;
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 74px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.45rem;
  font-weight: 800;
  color: #fff;
  letter-spacing: -0.5px;
  text-decoration: none;
}

.brand-logo-img {
  height: 44px;
  max-width: 190px;
  object-fit: contain;
  display: block;
  border-radius: 8px;
  filter: drop-shadow(0 0 10px rgba(56, 189, 248, 0.3));
  transition: transform 0.25s ease, filter 0.25s ease;
}

.brand-logo:hover .brand-logo-img {
  transform: scale(1.03);
  filter: drop-shadow(0 0 18px rgba(56, 189, 248, 0.6));
}

.brand-icon {
  width: 38px;
  height: 38px;
  background: var(--gradient-brand);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 15px rgba(56, 189, 248, 0.4);
}

.brand-gradient-text {
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  font-weight: 900;
}

.brand-domain {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-left: 4px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  padding: 2px 8px;
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.04);
}

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

.nav-link {
  color: var(--text-muted);
  font-size: 0.96rem;
  font-weight: 500;
  padding: 6px 4px;
  position: relative;
  transition: color 0.2s ease;
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background: var(--accent-cyan);
  transition: width 0.25s ease;
  border-radius: 2px;
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  text-decoration: none;
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn-primary {
  background: var(--gradient-btn);
  color: #fff;
  box-shadow: 0 4px 18px rgba(14, 165, 233, 0.35);
}

.btn-primary:hover {
  background: var(--gradient-btn-hover);
  color: #fff;
  box-shadow: 0 6px 25px rgba(56, 189, 248, 0.55);
  transform: translateY(-2px);
}

.btn-outline {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(255, 255, 255, 0.15);
  color: #e2e8f0;
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: var(--accent-cyan);
  color: #fff;
  transform: translateY(-2px);
}

.btn-lg {
  padding: 14px 34px;
  font-size: 1.1rem;
  border-radius: 12px;
}

.btn-sm {
  padding: 6px 14px;
  font-size: 0.85rem;
  border-radius: 8px;
}

.menu-toggle {
  display: none;
  background: transparent;
  border: none;
  color: #fff;
  font-size: 1.6rem;
  cursor: pointer;
}

/* Hero Section */
.hero-section {
  padding: 100px 0 70px;
  text-align: center;
  position: relative;
}

.hero-section::before {
  content: '';
  position: absolute;
  top: 45%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 850px;
  height: 480px;
  background: radial-gradient(ellipse at center, rgba(14, 165, 233, 0.16) 0%, rgba(99, 102, 241, 0.08) 50%, transparent 75%);
  pointer-events: none;
  z-index: -1;
  filter: blur(55px);
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(56, 189, 248, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.3);
  border-radius: 9999px;
  font-size: 0.88rem;
  color: var(--accent-cyan);
  font-weight: 600;
  margin-bottom: 24px;
  box-shadow: 0 0 15px rgba(56, 189, 248, 0.15);
  animation: pulse-glow 3s infinite alternate;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  background-color: var(--accent-emerald);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--accent-emerald);
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: 22px;
  letter-spacing: -1px;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-muted);
  max-width: 800px;
  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 {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 32px;
  font-size: 0.92rem;
  color: var(--text-dim);
  flex-wrap: wrap;
}

.hero-meta-item {
  display: flex;
  align-items: center;
  gap: 8px;
  color: #cbd5e1;
}

.hero-meta-item svg {
  color: var(--accent-emerald);
}

/* 全球节点统计条 */
.node-stats-bar {
  margin-top: 50px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px 30px;
  backdrop-filter: blur(12px);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  text-align: center;
  box-shadow: var(--shadow-card);
}

.stat-item h3 {
  font-size: 2.2rem;
  font-weight: 800;
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 4px;
}

.stat-item p {
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* Section 通用 */
.section-wrapper {
  padding: 90px 0;
}

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

.section-tag {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent-cyan);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: 12px;
}

.section-title {
  font-size: 2.4rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* 核心特性网格 */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.feature-card {
  background: var(--gradient-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 26px;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent-cyan), transparent);
  opacity: 0;
  transition: opacity 0.3s;
}

.feature-card:hover {
  transform: translateY(-6px);
  border-color: rgba(56, 189, 248, 0.4);
  box-shadow: 0 12px 35px rgba(0, 0, 0, 0.45), 0 0 20px rgba(56, 189, 248, 0.15);
}

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

.feature-icon {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  background: rgba(56, 189, 248, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  color: var(--accent-cyan);
}

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

.feature-text {
  font-size: 0.94rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* ==========================================================================
   价格区域 - 所有价格同排 (ALL PRICES IN ONE ROW)
   ========================================================================== */
.pricing-section {
  background: linear-gradient(180deg, rgba(15, 23, 42, 0.4) 0%, rgba(6, 9, 19, 0.8) 100%);
  position: relative;
}

.pricing-table-container {
  width: 100%;
  overflow-x: auto;
  padding-bottom: 15px;
}

/* 核心：桌面端强制 5 列同排对齐 (grid-template-columns: repeat(5, 1fr)) */
.pricing-grid-same-row {
  display: grid;
  grid-template-columns: repeat(5, minmax(220px, 1fr));
  gap: 16px;
  align-items: stretch;
}

.pricing-card {
  background: rgba(15, 23, 42, 0.85);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 16px;
  padding: 28px 18px 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  transition: all 0.3s ease;
  backdrop-filter: blur(12px);
}

.pricing-card:hover {
  transform: translateY(-8px);
  border-color: rgba(56, 189, 248, 0.5);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.6), 0 0 25px rgba(56, 189, 248, 0.2);
}

/* 热门推荐高亮卡片 */
.pricing-card.popular {
  background: linear-gradient(180deg, rgba(30, 41, 79, 0.9) 0%, rgba(15, 23, 42, 0.95) 100%);
  border: 2px solid #38bdf8;
  box-shadow: 0 10px 30px rgba(56, 189, 248, 0.25);
  transform: scale(1.02);
}

.pricing-card.popular:hover {
  transform: scale(1.02) translateY(-8px);
}

.badge-popular {
  position: absolute;
  top: -13px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gradient-brand);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 800;
  padding: 4px 14px;
  border-radius: 999px;
  box-shadow: 0 2px 10px rgba(99, 102, 241, 0.5);
  letter-spacing: 0.5px;
  white-space: nowrap;
}

.pricing-header {
  text-align: center;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  padding-bottom: 20px;
  margin-bottom: 20px;
}

.plan-name {
  font-size: 1.25rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 6px;
}

.plan-desc {
  font-size: 0.82rem;
  color: var(--text-dim);
  min-height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.plan-price {
  margin: 16px 0 8px;
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 2px;
}

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

.amount {
  font-size: 2.3rem;
  font-weight: 900;
  color: #fff;
  line-height: 1;
}

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

.plan-traffic-highlight {
  display: inline-block;
  background: rgba(56, 189, 248, 0.1);
  color: var(--accent-cyan);
  border: 1px solid rgba(56, 189, 248, 0.25);
  padding: 4px 12px;
  border-radius: 6px;
  font-size: 0.88rem;
  font-weight: 700;
  margin-top: 4px;
}

.pricing-features {
  list-style: none;
  margin-bottom: 26px;
  flex-grow: 1;
}

.pricing-features li {
  font-size: 0.88rem;
  color: #cbd5e1;
  padding: 8px 0;
  display: flex;
  align-items: center;
  gap: 10px;
  border-bottom: 1px dashed rgba(255, 255, 255, 0.05);
}

.pricing-features li:last-child {
  border-bottom: none;
}

.feature-check {
  color: var(--accent-emerald);
  flex-shrink: 0;
}

.pricing-footer {
  margin-top: auto;
}

.pricing-footer .btn {
  width: 100%;
}

.pricing-notice {
  text-align: center;
  margin-top: 36px;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.pricing-notice strong {
  color: var(--accent-cyan);
}

/* ==========================================================================
   文章与评测推荐区域 (Articles Section)
   ========================================================================== */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.article-card {
  background: var(--gradient-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: var(--shadow-sm);
}

.article-card:hover {
  transform: translateY(-6px);
  border-color: rgba(56, 189, 248, 0.45);
  box-shadow: var(--shadow-card), 0 0 20px rgba(56, 189, 248, 0.12);
}

.article-thumb-header {
  height: 140px;
  background: linear-gradient(135deg, rgba(14, 165, 233, 0.25) 0%, rgba(99, 102, 241, 0.25) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.article-badge-category {
  position: absolute;
  top: 14px;
  left: 14px;
  background: rgba(15, 23, 42, 0.85);
  border: 1px solid rgba(255, 255, 255, 0.15);
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent-cyan);
}

.article-read-time {
  position: absolute;
  bottom: 12px;
  right: 14px;
  font-size: 0.75rem;
  color: var(--text-muted);
  background: rgba(0,0,0,0.5);
  padding: 2px 8px;
  border-radius: 4px;
}

.article-card-body {
  padding: 24px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

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

.article-card-title a {
  color: #f1f5f9;
}

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

.article-card-excerpt {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 18px;
  flex-grow: 1;
}

.article-tags-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 18px;
}

.article-tag {
  font-size: 0.74rem;
  padding: 2px 8px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 4px;
  color: var(--text-muted);
  border: 1px solid rgba(255, 255, 255, 0.06);
}

.article-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 14px;
  font-size: 0.85rem;
}

.article-date {
  color: var(--text-dim);
}

.article-link-arrow {
  color: var(--accent-cyan);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

/* ==========================================================================
   用户真实评价与口碑 (Testimonials / Reviews)
   ========================================================================== */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.testimonial-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
  backdrop-filter: blur(12px);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform 0.25s ease;
}

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

.rating-stars {
  color: #fbbf24;
  margin-bottom: 14px;
  font-size: 1.1rem;
  letter-spacing: 2px;
}

.testimonial-quote {
  font-size: 0.95rem;
  color: #cbd5e1;
  line-height: 1.65;
  margin-bottom: 20px;
  flex-grow: 1;
}

.testimonial-user {
  display: flex;
  align-items: center;
  gap: 14px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 16px;
}

.user-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--gradient-brand);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  color: #fff;
  font-size: 1rem;
  box-shadow: 0 0 10px rgba(99, 102, 241, 0.4);
}

.user-info h4 {
  font-size: 0.98rem;
  color: #fff;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 6px;
}

.verified-icon {
  color: var(--accent-cyan);
  font-size: 0.85rem;
}

.user-info p {
  font-size: 0.82rem;
  color: var(--text-dim);
}

/* ==========================================================================
   常见问题 FAQ 手风琴
   ========================================================================== */
.faq-container {
  max-width: 860px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  margin-bottom: 14px;
  overflow: hidden;
  transition: all 0.25s ease;
}

.faq-item.active {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 20px rgba(56, 189, 248, 0.15);
}

.faq-question {
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  font-weight: 700;
  font-size: 1.05rem;
  color: #f1f5f9;
  user-select: none;
}

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

.faq-icon {
  font-size: 1.2rem;
  transition: transform 0.3s ease;
  color: var(--accent-cyan);
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
  padding: 0 24px;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  max-height: 400px;
  padding: 0 24px 20px 24px;
}

/* ==========================================================================
   外链与生态工具模块 (External Tools & Ecosystem)
   ========================================================================== */
.external-links-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.external-link-card {
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-md);
  padding: 18px;
  display: flex;
  align-items: center;
  gap: 14px;
  transition: all 0.25s ease;
}

.external-link-card:hover {
  background: rgba(26, 38, 74, 0.7);
  border-color: var(--accent-cyan);
  transform: translateY(-3px);
  box-shadow: 0 4px 15px rgba(56, 189, 248, 0.15);
}

.ext-icon {
  width: 40px;
  height: 40px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-cyan);
  flex-shrink: 0;
}

.ext-content h4 {
  font-size: 0.95rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 2px;
}

.ext-content p {
  font-size: 0.78rem;
  color: var(--text-dim);
}

/* 页脚 Footer */
.footer {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  background: #04070d;
  padding: 70px 0 30px;
  position: relative;
  z-index: 2;
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 40px;
  margin-bottom: 50px;
}

.footer-brand p {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.6;
  margin: 16px 0 20px;
  max-width: 320px;
}

.footer-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 20px;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 10px;
}

.footer-links a {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.footer-links a:hover {
  color: var(--accent-cyan);
  padding-left: 4px;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 26px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--text-dim);
  font-size: 0.85rem;
  flex-wrap: wrap;
  gap: 12px;
}

/* ==========================================================================
   文章详情页排版 (Article Detail Page Typography & Layout)
   ========================================================================== */
.article-header {
  padding: 50px 0 30px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  margin-bottom: 40px;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-dim);
  margin-bottom: 16px;
  flex-wrap: wrap;
}

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

.breadcrumb a:hover {
  color: var(--accent-cyan);
}

.article-main-title {
  font-size: 2.5rem;
  font-weight: 900;
  color: #fff;
  line-height: 1.3;
  margin-bottom: 20px;
}

.article-meta-info {
  display: flex;
  align-items: center;
  gap: 20px;
  color: var(--text-dim);
  font-size: 0.9rem;
  flex-wrap: wrap;
}

.article-meta-info span {
  display: flex;
  align-items: center;
  gap: 6px;
}

.article-content-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 40px;
  margin-bottom: 60px;
}

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

.article-body h2 {
  font-size: 1.75rem;
  font-weight: 800;
  color: #fff;
  margin: 40px 0 18px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  gap: 10px;
}

.article-body h2::before {
  content: '';
  display: inline-block;
  width: 6px;
  height: 24px;
  background: var(--gradient-brand);
  border-radius: 3px;
}

.article-body h3 {
  font-size: 1.35rem;
  font-weight: 700;
  color: #e2e8f0;
  margin: 28px 0 14px;
}

.article-body p {
  margin-bottom: 20px;
}

.article-body ul, .article-body ol {
  margin-bottom: 22px;
  padding-left: 24px;
}

.article-body li {
  margin-bottom: 8px;
}

.article-body strong {
  color: #fff;
  font-weight: 700;
}

.article-body blockquote {
  background: rgba(56, 189, 248, 0.08);
  border-left: 4px solid var(--accent-cyan);
  padding: 16px 20px;
  border-radius: 0 8px 8px 0;
  margin: 24px 0;
  color: #94a3b8;
  font-style: italic;
}

.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 28px 0;
  font-size: 0.95rem;
  background: rgba(15, 23, 42, 0.6);
  border-radius: 8px;
  overflow: hidden;
}

.article-body th, .article-body td {
  padding: 14px 18px;
  text-align: left;
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.article-body th {
  background: rgba(30, 41, 69, 0.8);
  color: #fff;
  font-weight: 700;
}

.article-body tr:hover {
  background: rgba(255, 255, 255, 0.03);
}

.article-cta-box {
  background: linear-gradient(135deg, rgba(14, 165, 233, 0.15) 0%, rgba(99, 102, 241, 0.2) 100%);
  border: 1px solid rgba(56, 189, 248, 0.35);
  border-radius: var(--radius-lg);
  padding: 32px;
  margin: 40px 0;
  text-align: center;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.4);
}

.article-cta-box h3 {
  font-size: 1.5rem;
  color: #fff;
  margin-bottom: 10px;
}

.article-cta-box p {
  color: #94a3b8;
  margin-bottom: 22px;
}

.article-sidebar {
  position: sticky;
  top: 90px;
  height: fit-content;
}

.sidebar-widget {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 22px;
  margin-bottom: 24px;
}

.sidebar-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.sidebar-links {
  list-style: none;
}

.sidebar-links li {
  margin-bottom: 12px;
}

.sidebar-links a {
  color: #cbd5e1;
  font-size: 0.9rem;
  line-height: 1.4;
  display: block;
}

.sidebar-links a:hover {
  color: var(--accent-cyan);
}

.sidebar-promo-card {
  background: linear-gradient(180deg, #1e294b 0%, #0f172a 100%);
  border: 1px solid rgba(56, 189, 248, 0.3);
  border-radius: var(--radius-md);
  padding: 22px;
  text-align: center;
}

.article-nav-pagination {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  margin: 50px 0;
  padding-top: 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.article-nav-item {
  width: 48%;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  transition: all 0.25s ease;
}

.article-nav-item:hover {
  border-color: var(--accent-cyan);
  transform: translateY(-2px);
}

.article-nav-label {
  font-size: 0.78rem;
  color: var(--text-dim);
  margin-bottom: 4px;
}

.article-nav-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: #e2e8f0;
}

/* 动效 */
@keyframes pulse-glow {
  0% { box-shadow: 0 0 10px rgba(56, 189, 248, 0.2); }
  100% { box-shadow: 0 0 25px rgba(56, 189, 248, 0.6); }
}

/* ==========================================================================
   响应式断点适配 (Responsive Design)
   ========================================================================== */
@media (max-width: 1200px) {
  .pricing-grid-same-row {
    grid-template-columns: repeat(5, minmax(200px, 1fr));
  }
}

@media (max-width: 1024px) {
  .hero-title {
    font-size: 2.8rem;
  }
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .testimonials-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .external-links-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-top {
    grid-template-columns: repeat(2, 1fr);
  }
  .article-content-layout {
    grid-template-columns: 1fr;
  }
  .article-sidebar {
    display: none;
  }
}

@media (max-width: 768px) {
  .menu-toggle {
    display: block;
  }
  .nav-menu {
    display: none;
    position: absolute;
    top: 74px;
    left: 0;
    right: 0;
    background: #090e1a;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    flex-direction: column;
    padding: 20px;
    gap: 16px;
  }
  .nav-menu.open {
    display: flex;
  }
  .hero-title {
    font-size: 2.2rem;
  }
  .hero-subtitle {
    font-size: 1.05rem;
  }
  .node-stats-bar {
    grid-template-columns: repeat(2, 1fr);
  }
  .features-grid {
    grid-template-columns: 1fr;
  }
  .articles-grid {
    grid-template-columns: 1fr;
  }
  .testimonials-grid {
    grid-template-columns: 1fr;
  }
  .external-links-grid {
    grid-template-columns: 1fr;
  }
  .footer-top {
    grid-template-columns: 1fr;
  }
  
  /* 移动端价格：横向平滑滑动容器，保持同排展示对比 */
  .pricing-table-container {
    -webkit-overflow-scrolling: touch;
    scroll-snap-type: x mandatory;
    padding: 10px 0 25px;
  }
  .pricing-grid-same-row {
    display: flex;
    gap: 14px;
    width: max-content;
    padding: 0 4px;
  }
  .pricing-card {
    min-width: 250px;
    max-width: 270px;
    scroll-snap-align: center;
  }
  .article-nav-pagination {
    flex-direction: column;
  }
  .article-nav-item {
    width: 100%;
  }
}