/* 赔钱机场官网 - 全局样式表 (peiqianvpn.homes) */
:root {
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --primary-light: #eef2ff;
  --primary-glow: rgba(79, 70, 229, 0.25);
  --accent: #2563eb;
  --accent-light: #eff6ff;
  --teal: #0d9488;
  --emerald: #10b981;
  --emerald-light: #ecfdf5;
  --text-main: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --bg-main: #f8fafc;
  --bg-card: #ffffff;
  --bg-subtle: #f1f5f9;
  --border-color: #e2e8f0;
  --border-focus: #c7d2fe;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 12px -2px rgba(15, 23, 42, 0.06), 0 2px 6px -2px rgba(15, 23, 42, 0.04);
  --shadow-lg: 0 12px 28px -6px rgba(15, 23, 42, 0.08), 0 4px 12px -3px rgba(15, 23, 42, 0.04);
  --shadow-xl: 0 20px 40px -10px rgba(79, 70, 229, 0.12), 0 10px 20px -8px rgba(15, 23, 42, 0.06);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --container-max: 1200px;
}

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

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

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

/* 动态网格背景装饰 - 如图1风格 */
.bg-grid-pattern {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -2;
  background-size: 32px 32px;
  background-image: 
    linear-gradient(to right, rgba(99, 102, 241, 0.04) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(99, 102, 241, 0.04) 1px, transparent 1px);
}

.bg-ambient-orb {
  position: fixed;
  border-radius: 50%;
  filter: blur(80px);
  pointer-events: none;
  z-index: -1;
  opacity: 0.6;
  animation: floatOrb 16s ease-in-out infinite alternate;
}

.orb-1 {
  width: 450px;
  height: 450px;
  top: -100px;
  right: -50px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.18) 0%, rgba(59, 130, 246, 0.05) 70%, transparent 100%);
}

.orb-2 {
  width: 500px;
  height: 500px;
  bottom: 20%;
  left: -150px;
  background: radial-gradient(circle, rgba(16, 185, 129, 0.12) 0%, rgba(99, 102, 241, 0.05) 70%, transparent 100%);
  animation-delay: -8s;
}

@keyframes floatOrb {
  0% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(30px, 40px) scale(1.08); }
  100% { transform: translate(-20px, 20px) scale(0.96); }
}

/* 容器与通用排版 */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 20px;
}

a {
  color: inherit;
  text-decoration: none;
}

/* 顶部导航栏 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(226, 232, 240, 0.8);
  transition: all 0.3s ease;
}

.site-header.scrolled {
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
}

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

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

.brand-icon {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: linear-gradient(135deg, #4f46e5 0%, #3b82f6 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  box-shadow: 0 4px 10px rgba(79, 70, 229, 0.3);
}

.brand-badge {
  font-size: 0.72rem;
  padding: 2px 8px;
  background: var(--emerald-light);
  color: var(--emerald);
  border: 1px solid rgba(16, 185, 129, 0.3);
  border-radius: 20px;
  font-weight: 600;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color 0.2s ease;
  position: relative;
  padding: 6px 0;
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary);
  border-radius: 2px;
  transition: width 0.2s ease;
}

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

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  cursor: pointer;
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, #4f46e5 0%, #3b82f6 100%);
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(79, 70, 229, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 22px rgba(79, 70, 229, 0.45);
}

.btn-outline {
  background: #ffffff;
  color: var(--text-main);
  border-color: var(--border-color);
}

.btn-outline:hover {
  background: var(--bg-subtle);
  border-color: #cbd5e1;
}

.btn-sm {
  padding: 7px 14px;
  font-size: 0.85rem;
}

.btn-lg {
  padding: 14px 28px;
  font-size: 1.05rem;
  border-radius: 16px;
}

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--text-main);
  cursor: pointer;
}

/* 顶部公告条 */
.top-announcement {
  background: linear-gradient(90deg, #4f46e5, #3b82f6, #06b6d4);
  color: #ffffff;
  padding: 8px 16px;
  font-size: 0.85rem;
  text-align: center;
  font-weight: 500;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
}

.top-announcement a {
  text-decoration: underline;
  font-weight: 600;
}

/* Hero 英雄区 - 图1设计灵感 */
.hero-section {
  padding: 80px 0 60px;
  position: relative;
  text-align: center;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: #ffffff;
  border: 1px solid rgba(79, 70, 229, 0.2);
  border-radius: 30px;
  box-shadow: 0 4px 12px rgba(79, 70, 229, 0.08);
  font-size: 0.88rem;
  color: var(--primary);
  font-weight: 600;
  margin-bottom: 24px;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  background-color: var(--emerald);
  border-radius: 50%;
  position: relative;
}

.pulse-dot::after {
  content: '';
  position: absolute;
  inset: -3px;
  border-radius: 50%;
  background-color: var(--emerald);
  opacity: 0.4;
  animation: pulse 1.8s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.9); opacity: 0.8; }
  100% { transform: scale(2.2); opacity: 0; }
}

.hero-title {
  font-size: 3.2rem;
  line-height: 1.15;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 20px;
  color: #0f172a;
}

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

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  max-width: 780px;
  margin: 0 auto 36px;
  line-height: 1.6;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  max-width: 900px;
  margin: 0 auto;
  padding: 24px;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(226, 232, 240, 0.9);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.stat-item {
  text-align: center;
}

.stat-num {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.2;
}

.stat-label {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* 核心卖点网格 */
.section {
  padding: 80px 0;
  position: relative;
}

.section-alt {
  background-color: rgba(255, 255, 255, 0.6);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

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

.section-tag {
  display: inline-block;
  padding: 4px 12px;
  background: var(--primary-light);
  color: var(--primary);
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: 20px;
  margin-bottom: 12px;
}

.section-title {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 14px;
  letter-spacing: -0.01em;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

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

/* 卡片风格 - 借鉴图1精致白色卡片+图标 */
.feature-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
}

.feature-card:hover {
  transform: translateY(-5px);
  border-color: rgba(99, 102, 241, 0.3);
  box-shadow: var(--shadow-xl);
}

.feature-icon-box {
  width: 54px;
  height: 54px;
  border-radius: 16px;
  background: linear-gradient(135deg, #4f46e5 0%, #3b82f6 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.5rem;
  margin-bottom: 20px;
  box-shadow: 0 8px 16px rgba(79, 70, 229, 0.2);
}

.feature-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-main);
}

.feature-text {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* 官方入口 / 镜像导航卡片 */
.portal-box {
  background: linear-gradient(135deg, #ffffff 0%, #f8faff 100%);
  border: 1px solid rgba(79, 70, 229, 0.2);
  border-radius: var(--radius-xl);
  padding: 40px;
  box-shadow: var(--shadow-lg);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}

.portal-status-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.portal-status-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  transition: all 0.2s ease;
}

.portal-status-item:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-sm);
}

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

.portal-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--emerald);
  box-shadow: 0 0 8px rgba(16, 185, 129, 0.6);
}

.portal-name {
  font-weight: 600;
  font-size: 0.95rem;
}

.portal-domain {
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* 套餐价格区域 - 严格按照图2样式复刻 */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: stretch;
}

.pricing-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 36px 30px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: var(--shadow-sm);
}

.pricing-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

/* 官方主力推荐卡片 - 高亮蓝色边框 */
.pricing-card.featured {
  border: 2px solid #3b82f6;
  box-shadow: 0 16px 36px -10px rgba(59, 130, 246, 0.2), 0 4px 12px -2px rgba(15, 23, 42, 0.05);
}

.featured-top-badge {
  position: absolute;
  top: -15px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, #2563eb 0%, #3b82f6 100%);
  color: #ffffff;
  font-size: 0.78rem;
  font-weight: 700;
  padding: 4px 16px;
  border-radius: 20px;
  display: flex;
  align-items: center;
  gap: 6px;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.pricing-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}

.pricing-title-group {
  display: flex;
  align-items: center;
  gap: 8px;
}

.pricing-title {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 6px;
}

.pricing-tag {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 2px 8px;
  background: #e0f2fe;
  color: #0369a1;
  border-radius: 6px;
}

.pricing-tag.entry {
  background: #f1f5f9;
  color: #475569;
}

.pricing-tag.flagship {
  background: #ede9fe;
  color: #6d28d9;
}

.pricing-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-bottom: 24px;
  min-height: 42px;
}

.pricing-price-wrap {
  margin-bottom: 12px;
}

.pricing-price {
  font-size: 2.5rem;
  font-weight: 900;
  color: var(--text-main);
  line-height: 1;
}

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

.pricing-cycle {
  font-size: 0.9rem;
  color: var(--text-muted);
  font-weight: 400;
}

.pricing-discount-badge {
  display: inline-block;
  background: #f0fdf4;
  color: #15803d;
  border: 1px dashed #86efac;
  font-size: 0.78rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 6px;
  margin-top: 8px;
  margin-bottom: 24px;
}

.pricing-features-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 32px;
  flex-grow: 1;
  border-top: 1px dashed var(--border-color);
  padding-top: 20px;
}

.pricing-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.feature-check {
  color: #10b981;
  font-weight: 700;
  font-size: 1rem;
  line-height: 1;
  margin-top: 2px;
}

.pricing-btn {
  width: 100%;
  padding: 13px;
  border-radius: 12px;
  font-weight: 700;
  font-size: 0.98rem;
  text-align: center;
  transition: all 0.2s ease;
  display: block;
}

.pricing-btn.featured {
  background: #2563eb;
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.35);
}

.pricing-btn.featured:hover {
  background: #1d4ed8;
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(37, 99, 235, 0.45);
}

.pricing-btn.default {
  background: #ffffff;
  color: var(--text-main);
  border: 1px solid var(--border-color);
}

.pricing-btn.default:hover {
  background: #f8fafc;
  border-color: #94a3b8;
  transform: translateY(-2px);
}

/* 使用教程选项卡 */
.tutorial-tabs-container {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 32px;
  box-shadow: var(--shadow-sm);
}

.tab-nav {
  display: flex;
  gap: 10px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 16px;
  margin-bottom: 28px;
  overflow-x: auto;
}

.tab-btn {
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  padding: 10px 20px;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  color: var(--text-secondary);
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
}

.tab-btn:hover {
  background: #e2e8f0;
  color: var(--text-main);
}

.tab-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(79, 70, 229, 0.25);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

.tutorial-step-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.tutorial-step-card {
  background: var(--bg-main);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  position: relative;
}

.step-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background: var(--primary);
  color: #ffffff;
  font-weight: 700;
  font-size: 0.85rem;
  border-radius: 50%;
  margin-bottom: 12px;
}

.step-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.step-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* 问题排查网格 */
.troubleshoot-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.troubleshoot-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  transition: all 0.25s ease;
}

.troubleshoot-card:hover {
  border-color: rgba(79, 70, 229, 0.3);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.troubleshoot-q {
  font-size: 1.15rem;
  font-weight: 700;
  color: #b91c1c;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.troubleshoot-a {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.troubleshoot-steps {
  margin-top: 12px;
  padding-left: 20px;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.troubleshoot-steps li {
  margin-bottom: 6px;
}

/* FAQ 常见问题搜索与分类导航 */
.faq-search-container {
  max-width: 860px;
  margin: 0 auto 30px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-search-box {
  position: relative;
  width: 100%;
}

.faq-search-input {
  width: 100%;
  padding: 16px 20px 16px 48px;
  background: #ffffff;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: 1rem;
  color: var(--text-main);
  outline: none;
  transition: all 0.25s ease;
  box-shadow: var(--shadow-sm);
}

.faq-search-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px var(--primary-glow);
}

.faq-search-icon {
  position: absolute;
  left: 18px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.2rem;
  color: var(--text-muted);
  pointer-events: none;
}

.faq-category-pills {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: center;
}

.faq-pill-btn {
  background: #ffffff;
  border: 1px solid var(--border-color);
  padding: 8px 16px;
  border-radius: 30px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.faq-pill-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--primary-light);
}

.faq-pill-btn.active {
  background: linear-gradient(135deg, #4f46e5 0%, #3b82f6 100%);
  color: #ffffff;
  border-color: transparent;
  box-shadow: 0 4px 12px rgba(79, 70, 229, 0.25);
}

.faq-pill-count {
  font-size: 0.75rem;
  padding: 1px 6px;
  border-radius: 10px;
  background: rgba(0, 0, 0, 0.08);
}

.faq-pill-btn.active .faq-pill-count {
  background: rgba(255, 255, 255, 0.25);
  color: #ffffff;
}

/* FAQ 常见问题折叠列表 */
.faq-list {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-item {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all 0.25s ease;
}

.faq-item:hover {
  border-color: #cbd5e1;
  box-shadow: var(--shadow-sm);
}

.faq-item.hidden {
  display: none !important;
}

.faq-question {
  width: 100%;
  padding: 18px 24px;
  text-align: left;
  background: none;
  border: none;
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  gap: 16px;
}

.faq-question-title {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.faq-item-tag {
  font-size: 0.72rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 6px;
  background: var(--bg-subtle);
  color: var(--text-muted);
}

.faq-item-tag.portal { background: #e0f2fe; color: #0284c7; }
.faq-item-tag.network { background: #ecfdf5; color: #059669; }
.faq-item-tag.pricing { background: #fef3c7; color: #d97706; }
.faq-item-tag.client { background: #ede9fe; color: #7c3aed; }
.faq-item-tag.device { background: #fce7f3; color: #db2777; }
.faq-item-tag.streaming { background: #fee2e2; color: #dc2626; }
.faq-item-tag.troubleshoot { background: #ffedd5; color: #ea580c; }

.faq-icon {
  font-size: 1.1rem;
  transition: transform 0.3s ease;
  color: var(--primary);
  flex-shrink: 0;
}

.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 24px;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.75;
}

.faq-item.active .faq-answer {
  padding-bottom: 22px;
  max-height: 1000px;
}

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

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

.faq-empty-state {
  display: none;
  text-align: center;
  padding: 40px 20px;
  color: var(--text-muted);
  font-size: 1rem;
}

/* 博客与知识库文章卡片列表 */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.article-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.article-card:hover {
  transform: translateY(-5px);
  border-color: rgba(79, 70, 229, 0.3);
  box-shadow: var(--shadow-lg);
}

.article-card-cover {
  height: 180px;
  background: linear-gradient(135deg, #1e1b4b 0%, #312e81 50%, #4338ca 100%);
  padding: 20px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  overflow: hidden;
}

.article-card-cover::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at top right, rgba(99, 102, 241, 0.35), transparent 70%);
}

.article-badge {
  position: relative;
  z-index: 1;
  align-self: flex-start;
  padding: 4px 10px;
  background: rgba(255, 255, 255, 0.18);
  backdrop-filter: blur(8px);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.25);
  font-size: 0.75rem;
  border-radius: 6px;
  font-weight: 600;
}

.article-cover-title {
  position: relative;
  z-index: 1;
  color: #ffffff;
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.4;
}

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

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

.article-card-snippet {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 20px;
  flex-grow: 1;
}

.article-card-link {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: gap 0.2s ease;
}

.article-card-link:hover {
  gap: 10px;
}

/* 底部 CTA 区域 */
.cta-banner {
  background: linear-gradient(135deg, #312e81 0%, #1e1b4b 100%);
  border-radius: var(--radius-xl);
  padding: 60px 40px;
  color: #ffffff;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-xl);
}

.cta-banner::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(to right, rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 32px 32px;
}

.cta-content {
  position: relative;
  z-index: 2;
  max-width: 680px;
  margin: 0 auto;
}

.cta-title {
  font-size: 2.4rem;
  font-weight: 800;
  margin-bottom: 16px;
  line-height: 1.2;
}

.cta-desc {
  font-size: 1.1rem;
  color: #cbd5e1;
  margin-bottom: 32px;
}

/* 页脚 */
.site-footer {
  background: #0f172a;
  color: #94a3b8;
  padding: 70px 0 30px;
  font-size: 0.9rem;
  border-top: 1px solid #1e293b;
}

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

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

.footer-brand-desc {
  font-size: 0.88rem;
  line-height: 1.6;
  max-width: 320px;
  margin-bottom: 16px;
}

.footer-links-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

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

.footer-links-list a {
  color: #94a3b8;
  transition: color 0.2s ease;
}

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

.footer-bottom {
  border-top: 1px solid #1e293b;
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.82rem;
  color: #64748b;
  flex-wrap: wrap;
  gap: 12px;
}

/* ========================================================
   文章详情页专有排版样式 (Article Layout)
   ======================================================== */
.article-page {
  padding: 40px 0 80px;
}

.breadcrumb-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

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

.breadcrumb-nav a:hover {
  color: var(--primary);
}

.article-main-container {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 40px;
  align-items: start;
}

.article-body-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 48px;
  box-shadow: var(--shadow-sm);
}

.article-header {
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 28px;
  margin-bottom: 36px;
}

.article-category {
  display: inline-block;
  padding: 4px 12px;
  background: var(--primary-light);
  color: var(--primary);
  border-radius: 20px;
  font-size: 0.82rem;
  font-weight: 700;
  margin-bottom: 14px;
}

.article-main-title {
  font-size: 2.2rem;
  font-weight: 800;
  line-height: 1.3;
  color: var(--text-main);
  margin-bottom: 18px;
}

.article-meta-bar {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 0.88rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

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

/* 文章正文排版规范 */
.article-content {
  font-size: 1.05rem;
  line-height: 1.8;
  color: #334155;
}

.article-content h2 {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--text-main);
  margin: 40px 0 18px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--primary-light);
  display: flex;
  align-items: center;
  gap: 10px;
}

.article-content h3 {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-main);
  margin: 28px 0 14px;
}

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

.article-content ul, .article-content ol {
  margin-bottom: 24px;
  padding-left: 28px;
}

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

.article-content strong {
  color: var(--text-main);
}

.article-content blockquote {
  border-left: 4px solid var(--primary);
  background: #f8fafc;
  padding: 16px 20px;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin: 24px 0;
  font-style: normal;
  color: var(--text-secondary);
}

.article-content .highlight-box {
  background: #eff6ff;
  border: 1px solid #bfdbfe;
  border-radius: var(--radius-md);
  padding: 20px 24px;
  margin: 24px 0;
}

.article-content .highlight-box.warning {
  background: #fffbeb;
  border-color: #fde68a;
}

.article-content .highlight-box.success {
  background: #f0fdf4;
  border-color: #bbf7d0;
}

.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 28px 0;
  font-size: 0.95rem;
}

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

.article-content th {
  background: #f8fafc;
  font-weight: 700;
  color: var(--text-main);
}

.article-content tr:nth-child(even) td {
  background: #fcfcfd;
}

/* 文章侧边栏 */
.article-sidebar {
  display: flex;
  flex-direction: column;
  gap: 24px;
  position: sticky;
  top: 90px;
}

.sidebar-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-sm);
}

.sidebar-card-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text-main);
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-color);
}

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

.toc-link {
  font-size: 0.88rem;
  color: var(--text-secondary);
  transition: all 0.2s ease;
  display: block;
}

.toc-link:hover {
  color: var(--primary);
  transform: translateX(4px);
}

.sidebar-cta-card {
  background: linear-gradient(135deg, #4f46e5 0%, #2563eb 100%);
  color: #ffffff;
  border: none;
  text-align: center;
  padding: 28px 20px;
}

.sidebar-cta-card h4 {
  font-size: 1.2rem;
  font-weight: 800;
  margin-bottom: 10px;
}

.sidebar-cta-card p {
  font-size: 0.88rem;
  opacity: 0.9;
  margin-bottom: 20px;
  line-height: 1.5;
}

/* 文章底部 FAQ 专区 */
.article-faq-section {
  margin-top: 50px;
  padding-top: 36px;
  border-top: 2px dashed var(--border-color);
}

.article-faq-title {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 24px;
}

/* 内部文章推荐模块 (文章内跳) */
.related-articles-section {
  margin-top: 40px;
  padding-top: 30px;
  border-top: 1px solid var(--border-color);
}

.related-articles-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-top: 16px;
}

.related-article-link {
  padding: 16px;
  background: var(--bg-main);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  transition: all 0.2s ease;
  display: block;
}

.related-article-link:hover {
  background: #ffffff;
  border-color: var(--primary);
  box-shadow: var(--shadow-sm);
  transform: translateY(-2px);
}

.related-article-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 6px;
}

.related-article-desc {
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* 移动端悬浮快捷进入栏 */
.mobile-sticky-bar {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 99;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-top: 1px solid var(--border-color);
  padding: 12px 20px;
  box-shadow: 0 -4px 16px rgba(0, 0, 0, 0.08);
  align-items: center;
  justify-content: space-between;
}

/* 响应式断点适配 */
@media (max-width: 1024px) {
  .features-grid, .pricing-grid, .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .portal-box {
    grid-template-columns: 1fr;
  }
  .article-main-container {
    grid-template-columns: 1fr;
  }
  .article-sidebar {
    display: none;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .hero-title {
    font-size: 2.3rem;
  }
  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
  }
  .features-grid, .pricing-grid, .articles-grid, .tutorial-step-grid, .troubleshoot-grid, .related-articles-grid {
    grid-template-columns: 1fr;
  }
  .main-nav {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: #ffffff;
    flex-direction: column;
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
  }
  .main-nav.show {
    display: flex;
  }
  .mobile-toggle {
    display: block;
  }
  .mobile-sticky-bar {
    display: flex;
  }
  .article-body-card {
    padding: 24px 18px;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
}