/* ===================================================================
   白嫖机场官网 (baipiaojichang.click) - 核心视觉与交互样式表
   风格标准：图1极简科技白蓝微网格、柔和阴影、图2精确定制套餐卡片
=================================================================== */

:root {
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --primary-light: #eef2ff;
  --accent: #3b82f6;
  --accent-gradient: linear-gradient(135deg, #4f46e5 0%, #3b82f6 100%);
  --btn-gradient: linear-gradient(135deg, #5b5df6 0%, #4338ca 100%);
  --bg-gradient: radial-gradient(circle at 50% 0%, #f4f7ff 0%, #fcfdfe 60%, #f8faff 100%);
  --card-bg: #ffffff;
  --card-dark: #12161f;
  --card-dark-border: #232936;
  --text-main: #0f172a;
  --text-muted: #64748b;
  --text-sub: #475569;
  --border: #e2e8f0;
  --border-light: #f1f5f9;
  --radius-lg: 22px;
  --radius-md: 14px;
  --radius-sm: 8px;
  --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 12px 30px -10px rgba(15, 23, 42, 0.08), 0 0 0 1px rgba(226, 232, 240, 0.8);
  --shadow-lg: 0 25px 50px -12px rgba(79, 70, 229, 0.15), 0 0 0 1px rgba(226, 232, 240, 0.9);
  --shadow-dark: 0 25px 50px -12px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(255, 255, 255, 0.08);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  --container-max: 1200px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  background-color: #f8fafc;
  background-image: 
    radial-gradient(circle at 50% 0%, rgba(219, 234, 254, 0.45) 0%, rgba(248, 250, 252, 0) 70%),
    linear-gradient(to right, rgba(226, 232, 240, 0.4) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(226, 232, 240, 0.4) 1px, transparent 1px);
  background-size: 100% 100%, 36px 36px, 36px 36px;
  color: var(--text-main);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: inherit;
  text-decoration: none;
  transition: all 0.2s ease;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

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

/* 导航栏 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(226, 232, 240, 0.8);
  transition: background 0.3s;
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo-area {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--text-main);
}

.logo-icon {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  box-shadow: 0 8px 16px -4px rgba(79, 70, 229, 0.4);
}

.logo-icon svg {
  width: 22px;
  height: 22px;
  fill: currentColor;
}

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

.nav-links a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-sub);
  position: relative;
  padding: 6px 2px;
}

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

.nav-links a::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background: var(--primary);
  border-radius: 2px;
  transition: width 0.25s ease;
}

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

.nav-cta {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* 按钮通用 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  padding: 10px 22px;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  text-decoration: none;
  line-height: 1;
}

.btn-primary {
  background: var(--btn-gradient);
  color: #ffffff;
  box-shadow: 0 10px 20px -5px rgba(91, 93, 246, 0.45);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 26px -6px rgba(91, 93, 246, 0.55);
  color: #ffffff;
}

.btn-secondary {
  background: #ffffff;
  color: var(--text-main);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  background: #f8fafc;
  border-color: #cbd5e1;
  transform: translateY(-2px);
}

.btn-glow {
  position: relative;
  overflow: hidden;
}

.btn-glow::before {
  content: "";
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.3) 10%, transparent 60%);
  transform: rotate(30deg);
  pointer-events: none;
  animation: shine 4s linear infinite;
}

@keyframes shine {
  0% { transform: translate(-30%, -30%) rotate(0deg); }
  100% { transform: translate(30%, 30%) rotate(360deg); }
}

/* 移动端菜单切换 */
.mobile-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  color: var(--text-main);
}

/* Hero Section */
.hero-section {
  padding: 80px 0 60px;
  position: relative;
  overflow: hidden;
  text-align: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(79, 70, 229, 0.08);
  border: 1px solid rgba(79, 70, 229, 0.2);
  border-radius: 999px;
  color: var(--primary);
  font-size: 0.88rem;
  font-weight: 600;
  margin-bottom: 24px;
  animation: floatBadge 3s ease-in-out infinite;
}

@keyframes floatBadge {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-4px); }
}

.hero-title {
  font-size: 3.2rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin-bottom: 20px;
  color: #0f172a;
}

.hero-title .gradient-text {
  background: linear-gradient(135deg, #4f46e5 0%, #2563eb 50%, #06b6d4 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-muted);
  max-width: 780px;
  margin: 0 auto 36px;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 50px;
}

.hero-actions .btn {
  padding: 14px 34px;
  font-size: 1.05rem;
  border-radius: 14px;
}

/* 实时专线状态点阵 */
.latency-bar {
  display: inline-flex;
  align-items: center;
  gap: 24px;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  padding: 12px 28px;
  border-radius: 999px;
  border: 1px solid rgba(226, 232, 240, 0.9);
  box-shadow: var(--shadow-sm);
  font-size: 0.88rem;
  color: var(--text-sub);
  margin-bottom: 30px;
}

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

.ping-indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #10b981;
  position: relative;
}

.ping-indicator::after {
  content: "";
  position: absolute;
  top: -2px;
  left: -2px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: rgba(16, 185, 129, 0.4);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(1); opacity: 1; }
  100% { transform: scale(2.2); opacity: 0; }
}

/* 仿图1微动效展示卡片 (Style Reference 1) */
.style-demo-card {
  width: 310px;
  margin: 0 auto 50px;
  background: #ffffff;
  border-radius: 20px;
  padding: 30px 24px;
  box-shadow: 0 20px 40px -15px rgba(0, 0, 0, 0.08), 0 0 0 1px rgba(226, 232, 240, 0.8);
  text-align: left;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  position: relative;
}

.style-demo-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 25px 50px -12px rgba(79, 70, 229, 0.2), 0 0 0 1px rgba(99, 102, 241, 0.3);
}

.style-card-icon {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  background: linear-gradient(135deg, #4f46e5 0%, #38bdf8 100%);
  margin-bottom: 20px;
  box-shadow: 0 8px 18px -4px rgba(79, 70, 229, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
}

.style-card-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: #0f172a;
  margin-bottom: 6px;
}

.style-card-sub {
  font-size: 0.9rem;
  color: #64748b;
  margin-bottom: 24px;
}

.style-card-btn {
  display: block;
  width: 100%;
  text-align: center;
  background: #5b5df6;
  color: #ffffff;
  font-weight: 600;
  padding: 12px 0;
  border-radius: 12px;
  font-size: 0.95rem;
  transition: all 0.2s ease;
}

.style-card-btn:hover {
  background: #474af0;
  transform: translateY(-1px);
}

/* 核心特性网格 */
.features-section {
  padding: 70px 0;
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 50px;
}

.section-tag {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--primary);
  background: var(--primary-light);
  padding: 4px 14px;
  border-radius: 999px;
  margin-bottom: 12px;
  letter-spacing: 0.05em;
}

.section-title {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.02em;
  margin-bottom: 14px;
}

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

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  box-shadow: var(--shadow-sm);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
  border-color: rgba(99, 102, 241, 0.4);
}

.feature-icon-box {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 22px;
  transition: transform 0.3s ease;
}

.feature-card:hover .feature-icon-box {
  transform: scale(1.1);
  background: var(--accent-gradient);
  color: #fff;
}

.feature-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-main);
}

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

/* ===================================================================
   图2 套餐价格卡片系统 (Exact Style Replication)
=================================================================== */
.pricing-section {
  padding: 80px 0;
  background: linear-gradient(180deg, rgba(241, 245, 249, 0.5) 0%, rgba(255, 255, 255, 0.8) 100%);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: stretch;
  max-width: 1120px;
  margin: 0 auto;
}

/* 方案卡片基础 (参照图2) */
.pricing-card {
  border-radius: 12px;
  padding: 36px 30px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.3s ease;
  position: relative;
}

/* 左侧与右侧白色卡片 */
.pricing-card-light {
  background: #ffffff;
  border: 1px solid #e2e8f0;
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05);
  color: #1e293b;
}

.pricing-card-light:hover {
  transform: translateY(-6px);
  box-shadow: 0 20px 35px -10px rgba(0, 0, 0, 0.1);
  border-color: #cbd5e1;
}

/* 中间黑色高亮卡片 (参照图2中间卡片) */
.pricing-card-dark {
  background: #191c24;
  color: #f8fafc;
  border: 1px solid #2d3446;
  box-shadow: 0 20px 45px -10px rgba(0, 0, 0, 0.35);
  transform: scale(1.02);
}

.pricing-card-dark:hover {
  transform: scale(1.03) translateY(-6px);
  box-shadow: 0 25px 55px -10px rgba(0, 0, 0, 0.45);
}

.pricing-card-header {
  margin-bottom: 24px;
}

.pricing-plan-title {
  font-size: 1.45rem;
  font-weight: 800;
  margin-bottom: 20px;
  letter-spacing: -0.01em;
}

.pricing-card-light .pricing-plan-title {
  color: #0f172a;
}

.pricing-card-dark .pricing-plan-title {
  color: #ffffff;
}

.pricing-spec-list {
  list-style: none;
  font-size: 0.88rem;
  line-height: 1.5;
  margin-bottom: 28px;
}

.pricing-spec-item {
  margin-bottom: 12px;
}

.pricing-spec-label {
  font-size: 0.82rem;
  display: block;
}

.pricing-card-light .pricing-spec-label {
  color: #64748b;
}

.pricing-card-dark .pricing-spec-label {
  color: #94a3b8;
}

.pricing-spec-value {
  font-weight: 500;
  margin-top: 2px;
}

.pricing-card-light .pricing-spec-value {
  color: #1e293b;
}

.pricing-card-dark .pricing-spec-value {
  color: #f1f5f9;
}

/* 价格数值展示区 */
.pricing-cost {
  margin-top: auto;
  padding-top: 20px;
  margin-bottom: 20px;
  display: flex;
  align-items: baseline;
}

.pricing-currency {
  font-size: 1.5rem;
  font-weight: 700;
}

.pricing-amount {
  font-size: 2.8rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin: 0 4px;
}

.pricing-unit {
  font-size: 0.95rem;
}

.pricing-card-light .pricing-cost {
  color: #0f172a;
}

.pricing-card-light .pricing-unit {
  color: #64748b;
}

.pricing-card-dark .pricing-cost {
  color: #ffffff;
}

.pricing-card-dark .pricing-unit {
  color: #94a3b8;
}

/* 底部简单项目 (如 200G • 设备数量：不限制) */
.pricing-bottom-features {
  list-style: none;
  margin-bottom: 24px;
  font-size: 0.88rem;
}

.pricing-bottom-features li {
  position: relative;
  padding-left: 14px;
  margin-bottom: 6px;
}

.pricing-bottom-features li::before {
  content: "•";
  position: absolute;
  left: 0;
  font-size: 1.2rem;
  line-height: 1;
}

.pricing-card-light .pricing-bottom-features {
  color: #64748b;
}

.pricing-card-light .pricing-bottom-features li::before {
  color: #eab308;
}

.pricing-card-dark .pricing-bottom-features {
  color: #94a3b8;
}

.pricing-card-dark .pricing-bottom-features li::before {
  color: #f59e0b;
}

/* 图2原版底部按钮 (深黑或白底) */
.pricing-btn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 13px 20px;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  transition: all 0.25s ease;
  text-decoration: none;
}

.pricing-card-light .pricing-btn {
  background: #181d24;
  color: #ffffff;
}

.pricing-card-light .pricing-btn:hover {
  background: #000000;
  transform: translateY(-2px);
}

.pricing-card-dark .pricing-btn {
  background: #ffffff;
  color: #0f172a;
}

.pricing-card-dark .pricing-btn:hover {
  background: #f1f5f9;
  transform: translateY(-2px);
}

.pricing-btn svg {
  width: 16px;
  height: 16px;
  transition: transform 0.2s ease;
}

.pricing-btn:hover svg {
  transform: translateX(4px);
}

/* 官方入口 / 备用镜像导航板块 */
.portals-section {
  padding: 70px 0;
}

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

.portal-box {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.portal-box-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.portal-name {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-main);
}

.portal-status-badge {
  font-size: 0.78rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 999px;
  background: #dcfce7;
  color: #15803d;
}

.portal-url {
  font-size: 0.88rem;
  color: var(--primary);
  font-family: monospace;
  background: var(--primary-light);
  padding: 6px 12px;
  border-radius: 6px;
  word-break: break-all;
  margin-bottom: 16px;
}

.portal-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 18px;
}

/* 使用教程与客户端支持 */
.tutorials-section {
  padding: 70px 0;
  background: #f8fafc;
}

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

.tutorial-card {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 24px 20px;
  text-align: center;
  transition: all 0.25s ease;
}

.tutorial-card:hover {
  transform: translateY(-4px);
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
}

.tutorial-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto 16px;
  border-radius: 12px;
  background: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
}

.tutorial-title {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.tutorial-platform {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 14px;
}

.tutorial-link {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

/* 博客文章专栏精选 */
.articles-section {
  padding: 80px 0;
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.article-card {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: all 0.3s ease;
}

.article-card:hover {
  transform: translateY(-6px);
  border-color: rgba(79, 70, 229, 0.4);
  box-shadow: var(--shadow-md);
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.article-tag {
  background: var(--primary-light);
  color: var(--primary);
  padding: 2px 10px;
  border-radius: 999px;
  font-weight: 600;
}

.article-title {
  font-size: 1.18rem;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.45;
  margin-bottom: 12px;
}

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

.article-excerpt {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 20px;
  flex-grow: 1;
}

.article-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--border-light);
  padding-top: 14px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--primary);
}

/* FAQ 常见问答手风琴 */
.faq-section {
  padding: 70px 0 90px;
  background: #ffffff;
}

.faq-list {
  max-width: 860px;
  margin: 0 auto;
}

.faq-item {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  margin-bottom: 16px;
  overflow: hidden;
  transition: border-color 0.25s ease;
}

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

.faq-question {
  width: 100%;
  text-align: left;
  background: #ffffff;
  border: none;
  padding: 20px 24px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  transition: background 0.2s;
}

.faq-question:hover {
  background: #f8fafc;
}

.faq-chevron {
  width: 20px;
  height: 20px;
  transition: transform 0.3s ease;
  color: var(--text-muted);
}

.faq-item.active .faq-chevron {
  transform: rotate(180deg);
  color: var(--primary);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
  background: #f8fafc;
  color: var(--text-sub);
  font-size: 0.95rem;
  line-height: 1.7;
  padding: 0 24px;
}

.faq-item.active .faq-answer {
  max-height: 400px;
  padding: 16px 24px 22px;
  border-top: 1px solid var(--border-light);
}

/* 文章详情页专用排版 (Article Reader Layout) */
.article-header {
  padding: 60px 0 30px;
  text-align: center;
  background: linear-gradient(180deg, rgba(238, 242, 255, 0.6) 0%, rgba(248, 250, 252, 0) 100%);
  border-bottom: 1px solid var(--border);
}

.article-header-container {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 24px;
}

.article-header-tag {
  display: inline-block;
  padding: 4px 14px;
  background: var(--primary-light);
  color: var(--primary);
  font-size: 0.85rem;
  font-weight: 600;
  border-radius: 999px;
  margin-bottom: 16px;
}

.article-page-title {
  font-size: 2.3rem;
  font-weight: 800;
  line-height: 1.35;
  color: #0f172a;
  margin-bottom: 18px;
}

.article-page-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.article-content-body {
  max-width: 860px;
  margin: 40px auto 60px;
  padding: 0 24px;
  font-size: 1.05rem;
  line-height: 1.85;
  color: #334155;
}

.article-content-body h2 {
  font-size: 1.55rem;
  font-weight: 800;
  color: #0f172a;
  margin: 40px 0 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}

.article-content-body h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: #1e293b;
  margin: 28px 0 12px;
}

.article-content-body p {
  margin-bottom: 18px;
}

.article-content-body ul, .article-content-body ol {
  margin: 16px 0 20px 24px;
}

.article-content-body li {
  margin-bottom: 10px;
}

.article-content-body blockquote {
  border-left: 4px solid var(--primary);
  background: var(--primary-light);
  padding: 16px 20px;
  border-radius: 0 10px 10px 0;
  margin: 24px 0;
  font-style: normal;
  color: #3730a3;
}

.article-content-body .table-wrapper {
  overflow-x: auto;
  margin: 24px 0;
}

.article-content-body table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}

.article-content-body th, .article-content-body td {
  padding: 12px 16px;
  border: 1px solid var(--border);
  text-align: left;
}

.article-content-body th {
  background: #f1f5f9;
  font-weight: 700;
}

/* 文章内部跳转与内链推荐 */
.article-related-box {
  background: #f8fafc;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 24px;
  margin: 40px 0;
}

.article-related-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: #0f172a;
}

.article-related-links {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.article-related-links a {
  color: var(--primary);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.article-related-links a:hover {
  text-decoration: underline;
}

/* 文章末尾独立FAQ模块 */
.article-faq-wrapper {
  margin-top: 50px;
  padding-top: 30px;
  border-top: 2px dashed var(--border);
}

.article-faq-title {
  font-size: 1.4rem;
  font-weight: 800;
  margin-bottom: 20px;
  color: #0f172a;
}

/* 网站底部 Footer */
.site-footer {
  margin-top: auto;
  background: #0f172a;
  color: #94a3b8;
  padding: 70px 0 30px;
  border-top: 1px solid #1e293b;
}

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

.footer-brand h4 {
  color: #ffffff;
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 14px;
}

.footer-brand p {
  font-size: 0.92rem;
  line-height: 1.7;
  max-width: 380px;
  margin-bottom: 20px;
}

.footer-col h5 {
  color: #f8fafc;
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 18px;
}

.footer-col ul {
  list-style: none;
  font-size: 0.9rem;
}

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

.footer-col a:hover {
  color: #ffffff;
}

.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid #1e293b;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  flex-wrap: wrap;
  gap: 16px;
}

/* 浮动固定注册条 (Floating Bar) */
.floating-cta-bar {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%) translateY(120%);
  z-index: 99;
  background: rgba(15, 23, 42, 0.92);
  backdrop-filter: blur(12px);
  padding: 12px 24px;
  border-radius: 999px;
  box-shadow: 0 15px 35px -5px rgba(0, 0, 0, 0.4);
  display: flex;
  align-items: center;
  gap: 20px;
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.15);
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.floating-cta-bar.visible {
  transform: translateX(-50%) translateY(0);
}

.floating-cta-text {
  font-size: 0.92rem;
  font-weight: 500;
}

.floating-cta-text strong {
  color: #38bdf8;
}

/* 响应式断点适配 */
@media (max-width: 1024px) {
  .hero-title {
    font-size: 2.5rem;
  }
  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 500px;
  }
  .pricing-card-dark {
    transform: none;
  }
  .pricing-card-dark:hover {
    transform: translateY(-4px);
  }
  .features-grid, .articles-grid, .portals-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .tutorials-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-top {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    width: 100%;
    background: #ffffff;
    flex-direction: column;
    padding: 20px;
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-md);
    gap: 16px;
  }
  .nav-links.show {
    display: flex;
  }
  .mobile-toggle {
    display: block;
  }
  .hero-title {
    font-size: 2rem;
  }
  .features-grid, .articles-grid, .portals-grid, .tutorials-grid {
    grid-template-columns: 1fr;
  }
  .footer-top {
    grid-template-columns: 1fr;
  }
  .latency-bar {
    flex-direction: column;
    gap: 8px;
    border-radius: 16px;
    padding: 12px 16px;
  }
  .floating-cta-bar {
    width: calc(100% - 32px);
    justify-content: space-between;
  }
  .floating-cta-text {
    font-size: 0.82rem;
  }
}