/* ==========================================================================
   一云梯机场 (Yiyunti Airport) - 官方网站设计系统
   淡蓝白色系 | 云层梯子视觉 | 响应式全屏卡片
   ========================================================================== */

:root {
  --primary-blue: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-light: #eff6ff;
  --primary-border: #bfdbfe;
  --sky-bg-start: #e0f2fe;
  --sky-bg-mid: #f0f9ff;
  --sky-bg-end: #ffffff;
  --text-main: #0f172a;
  --text-muted: #475569;
  --text-light: #64748b;
  --card-bg: #ffffff;
  --card-shadow: 0 10px 30px -5px rgba(37, 99, 235, 0.08), 0 4px 12px -2px rgba(0, 0, 0, 0.03);
  --card-shadow-hover: 0 20px 40px -10px rgba(37, 99, 235, 0.16), 0 8px 24px -4px rgba(0, 0, 0, 0.06);
  --border-radius: 16px;
  --transition-fast: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

/* Reset & Basic Setup */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-family);
  background: linear-gradient(180deg, rgba(239, 246, 255, 0.45) 0%, rgba(248, 250, 252, 0.6) 50%, rgba(255, 255, 255, 0.75) 100%),
              url('hero_bg.png') no-repeat center top fixed;
  background-size: cover;
  color: var(--text-main);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
}

/* Cloud Background Animation Overlay */
.cloud-bg-wrapper {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  pointer-events: none;
  z-index: 0;
}

.cloud-particle {
  position: absolute;
  background: radial-gradient(circle, rgba(255,255,255,0.95) 0%, rgba(224,242,254,0.6) 70%, rgba(255,255,255,0) 100%);
  border-radius: 50%;
  filter: blur(20px);
  animation: floatCloud 25s infinite ease-in-out alternate;
  opacity: 0.7;
}

@keyframes floatCloud {
  0% {
    transform: translateY(0px) translateX(0px) scale(1);
  }
  50% {
    transform: translateY(-25px) translateX(15px) scale(1.08);
  }
  100% {
    transform: translateY(15px) translateX(-10px) scale(0.95);
  }
}

/* Header & Navbar */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(226, 232, 240, 0.8);
  transition: var(--transition-fast);
}

.nav-container {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0.9rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-main);
  font-weight: 700;
  font-size: 1.35rem;
  letter-spacing: -0.5px;
}

.logo-icon {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, #2563eb 0%, #60a5fa 100%);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

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

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-muted);
  font-weight: 500;
  font-size: 0.95rem;
  transition: var(--transition-fast);
  position: relative;
  padding: 0.25rem 0;
}

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

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--primary-blue);
  transition: width 0.3s ease;
  border-radius: 2px;
}

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

.nav-cta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 1.4rem;
  border-radius: 50px;
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition-fast);
  border: 1px solid transparent;
}

.btn-primary {
  background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
  color: #ffffff !important;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.45);
  background: linear-gradient(135deg, #1d4ed8 0%, #1e40af 100%);
}

.btn-outline {
  background: rgba(255, 255, 255, 0.9);
  color: var(--primary-blue);
  border-color: var(--primary-border);
}

.btn-outline:hover {
  background: var(--primary-light);
  border-color: var(--primary-blue);
  transform: translateY(-2px);
}

.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  color: var(--text-main);
}

/* Hero Section */
.hero-section {
  position: relative;
  padding: 5rem 1.5rem 6rem;
  background: transparent;
  overflow: hidden;
  text-align: center;
}

.hero-content {
  max-width: 900px;
  margin: 0 auto;
  position: relative;
  z-index: 2;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1.1rem;
  background: rgba(255, 255, 255, 0.85);
  border: 1px solid rgba(191, 219, 254, 0.8);
  border-radius: 50px;
  color: var(--primary-blue);
  font-size: 0.88rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  box-shadow: 0 2px 10px rgba(37, 99, 235, 0.08);
}

.hero-badge svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
}

.hero-title {
  font-size: 3.2rem;
  font-weight: 800;
  line-height: 1.25;
  color: var(--text-main);
  margin-bottom: 1.25rem;
  letter-spacing: -1px;
}

.hero-title span {
  background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.2rem;
  color: var(--text-muted);
  margin-bottom: 2.5rem;
  max-width: 760px;
  margin-left: auto;
  margin-right: auto;
}

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

.btn-lg {
  padding: 0.85rem 2.2rem;
  font-size: 1.05rem;
  border-radius: 50px;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  max-width: 840px;
  margin: 0 auto;
  padding: 1.5rem;
  background: rgba(255, 255, 255, 0.75);
  backdrop-filter: blur(10px);
  border-radius: 20px;
  border: 1px solid rgba(255, 255, 255, 0.9);
  box-shadow: 0 10px 30px rgba(37, 99, 235, 0.06);
}

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

.stat-number {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--primary-blue);
  line-height: 1.2;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-light);
  margin-top: 0.2rem;
}

.hero-illustration {
  margin-top: 3.5rem;
  position: relative;
  max-width: 960px;
  margin-left: auto;
  margin-right: auto;
}

.hero-illustration img {
  width: 100%;
  max-height: 480px;
  object-fit: cover;
  border-radius: 24px;
  box-shadow: 0 20px 50px rgba(37, 99, 235, 0.15);
  border: 4px solid #ffffff;
}

/* Global Section Styling */
.section {
  padding: 5rem 1.5rem;
  position: relative;
  z-index: 1;
}

.section-header {
  text-align: center;
  max-width: 750px;
  margin: 0 auto 3.5rem;
}

.section-tag {
  display: inline-block;
  padding: 0.35rem 0.9rem;
  background: var(--primary-light);
  color: var(--primary-blue);
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 0.75rem;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.5px;
  margin-bottom: 0.85rem;
}

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

/* Features Grid */
.features-grid {
  max-width: 1240px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.75rem;
}

.feature-card {
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  border-radius: var(--border-radius);
  padding: 2.2rem 1.75rem;
  border: 1px solid rgba(255, 255, 255, 0.8);
  box-shadow: var(--card-shadow);
  transition: var(--transition-smooth);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--card-shadow-hover);
  border-color: var(--primary-border);
}

.feature-icon {
  width: 54px;
  height: 54px;
  border-radius: 14px;
  background: var(--primary-light);
  color: var(--primary-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
}

.feature-icon svg {
  width: 28px;
  height: 28px;
  fill: currentColor;
}

.feature-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.65rem;
}

.feature-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.55;
}

/* Pricing Section - Exact Match to User Screenshot */
.pricing-section {
  background: transparent;
}

.pricing-grid {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  align-items: stretch;
  padding-top: 1.5rem;
}

.pricing-card {
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(12px);
  border-radius: 20px;
  padding: 2.25rem 2rem;
  border: 1px solid rgba(255, 255, 255, 0.9);
  box-shadow: var(--card-shadow);
  transition: var(--transition-smooth);
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.pricing-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--card-shadow-hover);
}

.pricing-card.featured {
  border: 2px solid var(--primary-blue);
  box-shadow: 0 15px 35px rgba(37, 99, 235, 0.15);
}

/* Badge at top of featured card (最受欢迎) */
.popular-badge {
  position: absolute;
  top: -15px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--primary-blue);
  color: #ffffff;
  font-size: 0.8rem;
  font-weight: 700;
  padding: 0.25rem 1.1rem;
  border-radius: 50px;
  box-shadow: 0 4px 10px rgba(37, 99, 235, 0.3);
  letter-spacing: 0.5px;
  white-space: nowrap;
}

.card-tag {
  display: inline-block;
  padding: 0.2rem 0.75rem;
  background: #e2e8f0;
  color: #475569;
  border-radius: 6px;
  font-size: 0.78rem;
  font-weight: 600;
  margin-bottom: 0.85rem;
  align-self: flex-start;
}

.card-tag.dark {
  background: #334155;
  color: #ffffff;
}

.pricing-title {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 1rem;
}

.pricing-price {
  display: flex;
  align-items: baseline;
  gap: 0.3rem;
  margin-bottom: 1.75rem;
}

.price-currency {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--text-main);
}

.price-value {
  font-size: 2.6rem;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1;
}

.price-period {
  font-size: 0.95rem;
  color: var(--text-light);
  font-weight: 500;
}

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

.pricing-features li {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.93rem;
  color: var(--text-muted);
}

.pricing-features li svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: var(--primary-blue);
  stroke-width: 2.5;
  stroke-linecap: round;
  stroke-linejoin: round;
  flex-shrink: 0;
}

.pricing-card .btn {
  width: 100%;
  padding: 0.75rem;
  font-size: 1rem;
  border-radius: 10px;
}

.pricing-card.featured .btn-pricing {
  background: var(--primary-blue);
  color: #ffffff;
  border: none;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.pricing-card.featured .btn-pricing:hover {
  background: var(--primary-hover);
}

.pricing-card .btn-pricing {
  background: #ffffff;
  color: var(--primary-blue);
  border: 1.5px solid var(--primary-blue);
}

.pricing-card .btn-pricing:hover {
  background: var(--primary-light);
}

/* Suitable Groups (适合人群) */
.groups-grid {
  max-width: 1240px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.group-card {
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(12px);
  border-radius: var(--border-radius);
  padding: 2rem;
  border: 1px solid rgba(255, 255, 255, 0.9);
  box-shadow: var(--card-shadow);
  display: flex;
  gap: 1.25rem;
  align-items: flex-start;
  transition: var(--transition-fast);
}

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

.group-icon {
  width: 50px;
  height: 50px;
  border-radius: 12px;
  background: var(--sky-bg-start);
  color: var(--primary-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.group-icon svg {
  width: 26px;
  height: 26px;
  fill: currentColor;
}

.group-content h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
  color: var(--text-main);
}

.group-content p {
  font-size: 0.92rem;
  color: var(--text-muted);
}

/* Tutorial Section (Clash & Clash Party) */
.tutorial-section {
  background: transparent;
}

.tutorial-tabs {
  max-width: 1000px;
  margin: 0 auto;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(12px);
  border-radius: 20px;
  border: 1px solid rgba(255, 255, 255, 0.9);
  box-shadow: var(--card-shadow);
  overflow: hidden;
}

.tab-buttons {
  display: flex;
  background: #f8fafc;
  border-bottom: 1px solid #e2e8f0;
}

.tab-btn {
  flex: 1;
  padding: 1.1rem;
  background: none;
  border: none;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-muted);
  cursor: pointer;
  transition: var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
}

.tab-btn.active {
  background: #ffffff;
  color: var(--primary-blue);
  border-bottom: 3px solid var(--primary-blue);
}

.tab-content {
  padding: 2.5rem;
  display: none;
}

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

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

.step-card {
  background: #f8fafc;
  padding: 1.5rem;
  border-radius: 14px;
  border: 1px solid #cbd5e1;
  position: relative;
}

.step-number {
  width: 32px;
  height: 32px;
  background: var(--primary-blue);
  color: #ffffff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.95rem;
  margin-bottom: 1rem;
}

.step-card h4 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.step-card p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* User Reviews */
.reviews-grid {
  max-width: 1240px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
}

.review-card {
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(12px);
  border-radius: var(--border-radius);
  padding: 2rem;
  border: 1px solid rgba(255, 255, 255, 0.9);
  box-shadow: var(--card-shadow);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.stars {
  color: #f59e0b;
  margin-bottom: 1rem;
  font-size: 1.1rem;
}

.review-text {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 1.5rem;
  font-style: italic;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.author-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--primary-light);
  color: var(--primary-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
}

.author-info h4 {
  font-size: 0.95rem;
  font-weight: 700;
}

.author-info p {
  font-size: 0.8rem;
  color: var(--text-light);
}

/* FAQ Accordion Section */
.faq-container {
  max-width: 850px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.faq-item {
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.9);
  border-radius: 14px;
  overflow: hidden;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.02);
  transition: var(--transition-fast);
}

.faq-question {
  width: 100%;
  padding: 1.25rem 1.5rem;
  background: none;
  border: none;
  text-align: left;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.faq-icon {
  width: 20px;
  height: 20px;
  fill: currentColor;
  color: var(--primary-blue);
  transition: transform 0.3s ease;
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s cubic-bezier(0, 1, 0, 1);
  padding: 0 1.5rem;
}

.faq-item.active .faq-answer {
  max-height: 800px;
  padding: 0 1.5rem 1.5rem;
  transition: max-height 0.5s ease-in-out;
}

.faq-answer p {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* Articles Section */
.articles-section {
  background: transparent;
}

.articles-grid {
  max-width: 1240px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
}

.article-card {
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(12px);
  border-radius: var(--border-radius);
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.9);
  box-shadow: var(--card-shadow);
  transition: var(--transition-smooth);
  display: flex;
  flex-direction: column;
}

.article-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--card-shadow-hover);
  border-color: var(--primary-border);
}

.article-body {
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.article-tag {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--primary-blue);
  margin-bottom: 0.5rem;
  text-transform: uppercase;
}

.article-title {
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 0.75rem;
}

.article-title a {
  text-decoration: none;
  color: var(--text-main);
  transition: var(--transition-fast);
}

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

.article-excerpt {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.article-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 1rem;
  border-top: 1px solid #f1f5f9;
  font-size: 0.85rem;
  color: var(--text-light);
}

.read-more {
  text-decoration: none;
  color: var(--primary-blue);
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.read-more:hover {
  color: var(--primary-hover);
}

/* Footer & Sitemap Links */
.site-footer {
  background: #0f172a;
  color: #94a3b8;
  padding: 5rem 1.5rem 2rem;
}

.footer-container {
  max-width: 1240px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: 3rem;
  margin-bottom: 4rem;
}

.footer-brand .brand-logo {
  color: #ffffff;
  margin-bottom: 1.25rem;
}

.footer-desc {
  font-size: 0.9rem;
  line-height: 1.6;
  margin-bottom: 1.5rem;
  color: #94a3b8;
}

.footer-title {
  color: #ffffff;
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
}

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

.footer-links a {
  text-decoration: none;
  color: #94a3b8;
  font-size: 0.9rem;
  transition: var(--transition-fast);
}

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

.footer-bottom {
  max-width: 1240px;
  margin: 0 auto;
  padding-top: 2rem;
  border-top: 1px solid #1e293b;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.85rem;
}

.keywords-tags {
  max-width: 1240px;
  margin: 0 auto 3rem;
  padding: 1.5rem;
  background: #1e293b;
  border-radius: 12px;
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  align-items: center;
}

.keywords-tags span {
  font-size: 0.8rem;
  color: #64748b;
  font-weight: 700;

}

.keywords-tags a {
  color: #94a3b8;
  font-size: 0.8rem;
  text-decoration: none;
  background: rgba(255, 255, 255, 0.05);
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  transition: var(--transition-fast);
}

.keywords-tags a:hover {
  color: #ffffff;
  background: var(--primary-blue);
}

/* Article Page Layout Styles (For 12 SEO Articles & Legal pages) */
.article-page-header {
  background: transparent;
  padding: 3rem 1.5rem;
  text-align: center;
}

.article-breadcrumb {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-size: 0.9rem;
  color: var(--text-light);
  margin-bottom: 1.25rem;
}

.article-breadcrumb a {
  color: var(--primary-blue);
  text-decoration: none;
}

.article-meta-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  font-size: 0.88rem;
  color: var(--text-light);
  margin-top: 1rem;
}

.article-main-container {
  max-width: 900px;
  margin: 0 auto;
  padding: 3rem 1.5rem 6rem;
}

.article-content {
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(16px);
  padding: 3rem;
  border-radius: 20px;
  border: 1px solid rgba(255, 255, 255, 0.9);
  box-shadow: var(--card-shadow);
  line-height: 1.8;
  color: #334155;
  font-size: 1.05rem;
}

.article-content h1 {
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 1.5rem;
  color: var(--text-main);
  line-height: 1.3;
}

.article-content h2 {
  font-size: 1.6rem;
  font-weight: 700;
  margin: 2.2rem 0 1rem;
  color: var(--text-main);
  border-bottom: 2px solid var(--primary-light);
  padding-bottom: 0.5rem;
}

.article-content h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin: 1.75rem 0 0.75rem;
  color: var(--text-main);
}

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

.article-content ul, .article-content ol {
  margin-bottom: 1.5rem;
  padding-left: 1.75rem;
}

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

.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 2rem 0;
  font-size: 0.95rem;
}

.article-content th, .article-content td {
  padding: 0.85rem 1rem;
  border: 1px solid #e2e8f0;
  text-align: left;
}

.article-content th {
  background: var(--primary-light);
  color: var(--primary-blue);
  font-weight: 700;
}

.article-content .cta-box {
  margin: 2.5rem 0;
  padding: 2rem;
  background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
  border-left: 5px solid var(--primary-blue);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.article-content .cta-box h4 {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 0.4rem;
}

.article-content .cta-box p {
  font-size: 0.92rem;
  color: var(--text-muted);
  margin-bottom: 0;
}

/* Related Articles Box */
.related-articles {
  margin-top: 4rem;
  padding-top: 3rem;
  border-top: 2px solid #f1f5f9;
}

.related-title {
  font-size: 1.4rem;
  font-weight: 800;
  margin-bottom: 1.5rem;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

/* Media Queries / Responsive */
@media (max-width: 1024px) {
  .hero-title {
    font-size: 2.5rem;
  }
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-grid {
    grid-template-columns: repeat(1, 1fr);
    max-width: 480px;
  }
  .groups-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .reviews-grid, .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-container {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .nav-links, .nav-cta {
    display: none;
  }
  .mobile-menu-toggle {
    display: block;
  }
  .nav-links.active {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background: #ffffff;
    padding: 1.5rem;
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
    gap: 1rem;
  }
  .hero-title {
    font-size: 2.1rem;
  }
  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
  }
  .features-grid, .groups-grid, .reviews-grid, .articles-grid {
    grid-template-columns: 1fr;
  }
  .step-list {
    grid-template-columns: 1fr;
  }
  .article-content {
    padding: 1.5rem;
  }
  .article-content .cta-box {
    flex-direction: column;
    text-align: center;
  }
  .related-grid {
    grid-template-columns: 1fr;
  }
  .footer-container {
    grid-template-columns: 1fr;
  }
}

/* Floating Sidebar Conversion Card (侧边栏引导消费卡片) */
.sticky-side-cta {
  position: fixed;
  right: 1.5rem;
  bottom: 2rem;
  z-index: 999;
  width: 310px;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(16px);
  border: 2px solid var(--primary-blue);
  border-radius: 18px;
  padding: 1.25rem;
  box-shadow: 0 15px 40px rgba(37, 99, 235, 0.25);
  animation: floatWidget 4s ease-in-out infinite alternate;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

@keyframes floatWidget {
  0% { transform: translateY(0px); }
  100% { transform: translateY(-8px); }
}

.sticky-side-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}

.side-badge {
  background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
  color: #ffffff;
  font-size: 0.75rem;
  font-weight: 800;
  padding: 0.2rem 0.6rem;
  border-radius: 50px;
  box-shadow: 0 2px 6px rgba(239, 68, 68, 0.3);
}

.side-close-btn {
  background: none;
  border: none;
  font-size: 1.2rem;
  color: #94a3b8;
  cursor: pointer;
  line-height: 1;
}

.side-close-btn:hover {
  color: #0f172a;
}

.side-title {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 0.4rem;
}

.side-price-row {
  display: flex;
  align-items: baseline;
  gap: 0.2rem;
  margin-bottom: 0.75rem;
}

.side-price-val {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--primary-blue);
}

.side-price-desc {
  font-size: 0.85rem;
  color: var(--text-light);
}

.side-btn {
  width: 100%;
  padding: 0.65rem;
  font-size: 0.95rem;
  font-weight: 700;
  border-radius: 10px;
  background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
  color: #ffffff !important;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.35);
  animation: buttonPulse 2s infinite;
}

@keyframes buttonPulse {
  0% { box-shadow: 0 0 0 0 rgba(37, 99, 235, 0.6); }
  70% { box-shadow: 0 0 0 10px rgba(37, 99, 235, 0); }
  100% { box-shadow: 0 0 0 0 rgba(37, 99, 235, 0); }
}

@media (max-width: 768px) {
  .sticky-side-cta {
    width: calc(100% - 2rem);
    right: 1rem;
    bottom: 1rem;
  }
}

/* Article Sidebar Conversion Grid Layout */
.article-layout-grid {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 2rem;
  align-items: start;
}

.sidebar-card-widget {
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(14px);
  border-radius: 18px;
  padding: 1.5rem;
  border: 1px solid rgba(226, 232, 240, 0.9);
  box-shadow: var(--card-shadow);
  margin-bottom: 1.5rem;
  position: sticky;
  top: 90px;
}

.sidebar-card-title {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--primary-light);
}

.sidebar-plan-item {
  background: var(--primary-light);
  padding: 1rem;
  border-radius: 12px;
  margin-bottom: 0.85rem;
  border: 1px solid var(--primary-border);
}

.sidebar-plan-item.highlight {
  background: #ffffff;
  border: 2px solid var(--primary-blue);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.15);
}

.sidebar-plan-title {
  font-size: 0.95rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.sidebar-plan-price {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--primary-blue);
  margin: 0.3rem 0;
}

.sidebar-plan-features {
  font-size: 0.8rem;
  color: var(--text-muted);
  list-style: none;
  margin-bottom: 0.75rem;
}

@media (max-width: 992px) {
  .article-layout-grid {
    grid-template-columns: 1fr;
  }
}