/* ==========================================================================
   红杏云机场 (HongXingYun) - 全站统一设计系统与样式表
   主题色：玫红/红杏色 (Rose Red) Light Theme
   包含：动态呼吸灯、红杏花线条元素、毛玻璃、卡片响应式布局
   ========================================================================== */

:root {
  /* 品牌核心色彩体系 */
  --primary-rgb: 230, 57, 86;
  --primary: #E63956;
  --primary-hover: #C2185B;
  --primary-dark: #A31545;
  --primary-light: #FFF0F3;
  --primary-glow: rgba(230, 57, 86, 0.25);
  --primary-gradient: linear-gradient(135deg, #E63956 0%, #FF6B8B 100%);
  --primary-gradient-subtle: linear-gradient(135deg, #FFF0F3 0%, #FFE4E9 100%);

  /* 辅助色彩 */
  --accent-gold: #FFB300;
  --accent-green: #10B981;
  --accent-blue: #3B82F6;

  /* 背景色系 - 浅色简约 */
  --bg-body: #FFF9FA;
  --bg-card: #FFFFFF;
  --bg-card-hover: #FFFFFF;
  --bg-glass: rgba(255, 255, 255, 0.85);
  --bg-subtle: #FDF2F4;

  /* 文字颜色 */
  --text-main: #1F242A;
  --text-muted: #5E6773;
  --text-light: #8C96A3;
  --text-link: #E63956;

  /* 边框与阴影 */
  --border-subtle: rgba(230, 57, 86, 0.12);
  --border-focus: rgba(230, 57, 86, 0.4);
  --shadow-sm: 0 4px 12px rgba(230, 57, 86, 0.05);
  --shadow-md: 0 8px 24px rgba(230, 57, 86, 0.08);
  --shadow-lg: 0 16px 40px rgba(230, 57, 86, 0.12);
  --shadow-glow: 0 0 30px rgba(230, 57, 86, 0.3);

  /* 圆角与过渡 */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  scroll-behavior: smooth;
  color: var(--text-main);
  background-color: var(--bg-body);
  line-height: 1.6;
}

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

a {
  color: var(--text-link);
  text-decoration: none;
  transition: var(--transition);
}

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

/* --------------------------------------------------------------------------
   背景动态呼吸灯点缀 (Ambient Breathing Lights)
   -------------------------------------------------------------------------- */
.ambient-glow-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: -1;
  overflow: hidden;
}

.ambient-glow-1 {
  position: absolute;
  top: -10%;
  right: -5%;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(230, 57, 86, 0.18) 0%, rgba(255, 107, 139, 0.08) 50%, rgba(255, 249, 250, 0) 70%);
  filter: blur(60px);
  animation: pulseGlow1 8s infinite alternate ease-in-out;
}

.ambient-glow-2 {
  position: absolute;
  top: 40%;
  left: -10%;
  width: 550px;
  height: 550px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 107, 139, 0.15) 0%, rgba(230, 57, 86, 0.05) 50%, rgba(255, 249, 250, 0) 70%);
  filter: blur(70px);
  animation: pulseGlow2 10s infinite alternate ease-in-out;
}

.ambient-glow-3 {
  position: absolute;
  bottom: 10%;
  right: 15%;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(230, 57, 86, 0.12) 0%, rgba(255, 182, 193, 0.08) 50%, rgba(255, 249, 250, 0) 70%);
  filter: blur(65px);
  animation: pulseGlow1 12s infinite alternate ease-in-out;
}

@keyframes pulseGlow1 {
  0% { transform: translate(0, 0) scale(1); opacity: 0.7; }
  100% { transform: translate(-40px, 50px) scale(1.15); opacity: 0.95; }
}

@keyframes pulseGlow2 {
  0% { transform: translate(0, 0) scale(1.1); opacity: 0.6; }
  100% { transform: translate(50px, -30px) scale(0.9); opacity: 0.9; }
}

/* --------------------------------------------------------------------------
   红杏花元素装饰 (Apricot Blossom SVG Motifs)
   -------------------------------------------------------------------------- */
.blossom-decor {
  position: absolute;
  pointer-events: none;
  opacity: 0.18;
  z-index: 0;
}

.blossom-top-right {
  top: 20px;
  right: 30px;
  width: 140px;
  height: 140px;
}

.blossom-bottom-left {
  bottom: 40px;
  left: 20px;
  width: 120px;
  height: 120px;
  transform: rotate(-30deg);
}

/* 布局容器 */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* --------------------------------------------------------------------------
   导航栏 Header
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  transition: var(--transition);
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-main);
  text-decoration: none;
}

.brand-logo svg {
  width: 34px;
  height: 34px;
  color: var(--primary);
}

.brand-name {
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-badge {
  font-size: 0.75rem;
  background: var(--primary-light);
  color: var(--primary-hover);
  padding: 2px 8px;
  border-radius: var(--radius-full);
  font-weight: 600;
  border: 1px solid var(--border-subtle);
}

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

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-muted);
  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-gradient);
  border-radius: 2px;
  transition: var(--transition);
}

.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-full);
  cursor: pointer;
  transition: var(--transition);
  border: none;
  text-decoration: none;
}

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

.btn-lg {
  padding: 14px 34px;
  font-size: 1.05rem;
}

.btn-primary {
  background: var(--primary-gradient);
  color: #FFFFFF !important;
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  color: #FFFFFF;
}

.btn-outline {
  background: var(--bg-card);
  color: var(--primary) !important;
  border: 1px solid var(--border-subtle);
}

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

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

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: var(--primary-light);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  color: var(--primary-dark);
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 24px;
}

.hero-tag svg {
  width: 16px;
  height: 16px;
  color: var(--primary);
}

.hero-title {
  font-size: 3.2rem;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 20px;
  color: var(--text-main);
  letter-spacing: -0.5px;
}

.hero-title span {
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.2rem;
  color: var(--text-muted);
  max-width: 780px;
  margin: 0 auto 36px;
  line-height: 1.7;
}

.hero-cta {
  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: 960px;
  margin: 0 auto;
  background: var(--bg-card);
  padding: 24px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-md);
}

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

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

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* --------------------------------------------------------------------------
   通用 Section 样式
   -------------------------------------------------------------------------- */
.section {
  padding: 80px 0;
  position: relative;
}

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

.section-subtitle {
  color: var(--primary);
  font-size: 0.9rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 8px;
  display: block;
}

.section-title {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 14px;
  line-height: 1.3;
}

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

/* --------------------------------------------------------------------------
   核心优势 (Advantages)
   -------------------------------------------------------------------------- */
.grid-features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  background: var(--bg-card);
  padding: 32px 28px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--primary-gradient);
  opacity: 0;
  transition: var(--transition);
}

.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(230, 57, 86, 0.3);
}

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

.feature-icon-wrapper {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background: var(--primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  color: var(--primary);
}

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

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

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

/* --------------------------------------------------------------------------
   套餐价格 (Pricing Plans)
   -------------------------------------------------------------------------- */
.grid-pricing {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: var(--transition);
}

.pricing-card.popular {
  border: 2px solid var(--primary);
  box-shadow: var(--shadow-md), var(--shadow-glow);
  transform: scale(1.03);
}

.popular-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--primary-gradient);
  color: #FFFFFF;
  font-size: 0.8rem;
  font-weight: 700;
  padding: 4px 16px;
  border-radius: var(--radius-full);
  letter-spacing: 0.5px;
}

.pricing-header {
  text-align: center;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 20px;
}

.pricing-name {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.pricing-price {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--primary);
  line-height: 1;
  margin-bottom: 6px;
}

.pricing-price span {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
}

.pricing-traffic {
  font-size: 0.88rem;
  color: var(--text-muted);
}

.pricing-features {
  list-style: none;
  margin-bottom: 28px;
  flex-grow: 1;
}

.pricing-features li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.pricing-features li svg {
  width: 18px;
  height: 18px;
  color: var(--primary);
  flex-shrink: 0;
}

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

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

/* --------------------------------------------------------------------------
   适合人群 (Audience)
   -------------------------------------------------------------------------- */
.grid-audience {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.audience-card {
  background: var(--bg-card);
  padding: 28px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-sm);
  display: flex;
  gap: 18px;
  align-items: flex-start;
  transition: var(--transition);
}

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

.audience-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.audience-icon svg {
  width: 24px;
  height: 24px;
}

.audience-content h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 6px;
}

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

/* --------------------------------------------------------------------------
   客户端教程 (Tutorials Hub)
   -------------------------------------------------------------------------- */
.tutorial-box {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-md);
  padding: 36px;
}

.tutorial-tabs {
  display: flex;
  gap: 12px;
  border-bottom: 2px solid var(--border-subtle);
  margin-bottom: 30px;
  overflow-x: auto;
}

.tab-btn {
  padding: 12px 24px;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-muted);
  background: none;
  border: none;
  cursor: pointer;
  border-bottom: 3px solid transparent;
  margin-bottom: -2px;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: var(--transition);
}

.tab-btn svg {
  width: 18px;
  height: 18px;
}

.tab-btn:hover, .tab-btn.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
  animation: fadeIn 0.4s ease-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.steps-list {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.step-item {
  display: flex;
  gap: 20px;
  align-items: flex-start;
  background: var(--primary-light);
  padding: 20px 24px;
  border-radius: var(--radius-md);
  border-left: 4px solid var(--primary);
}

.step-num {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--primary);
  color: #FFFFFF;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 1rem;
}

.step-detail h4 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 6px;
}

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

/* --------------------------------------------------------------------------
   SEO 文章卡片列表 (Article Directory)
   -------------------------------------------------------------------------- */
.grid-articles {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.article-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  padding: 28px;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
}

.article-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(230, 57, 86, 0.3);
}

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

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

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

.article-title a {
  color: var(--text-main);
}

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

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

.article-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--primary);
}

.article-link svg {
  width: 16px;
  height: 16px;
  transition: var(--transition);
}

.article-link:hover svg {
  transform: translateX(4px);
}

/* --------------------------------------------------------------------------
   常见问题 (FAQ Accordion)
   -------------------------------------------------------------------------- */
.faq-list {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

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

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

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

.faq-question svg {
  width: 20px;
  height: 20px;
  color: var(--primary);
  transition: var(--transition);
}

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

.faq-answer {
  padding: 0 24px 20px;
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.7;
  display: none;
}

.faq-item.active .faq-answer {
  display: block;
}

/* --------------------------------------------------------------------------
   文章详情页排版 (Article Detail Page Typography)
   -------------------------------------------------------------------------- */
.article-header {
  padding: 40px 0 30px;
  text-align: center;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 40px;
}

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

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

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

.breadcrumb-separator {
  color: var(--text-light);
}

.article-h1 {
  font-size: 2.4rem;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 18px;
  color: var(--text-main);
}

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

.article-content {
  max-width: 840px;
  margin: 0 auto;
  font-size: 1.05rem;
  line-height: 1.8;
  color: #2D3748;
}

.article-content h2 {
  font-size: 1.65rem;
  font-weight: 700;
  margin: 40px 0 18px;
  color: var(--text-main);
  padding-bottom: 8px;
  border-bottom: 2px solid var(--primary-light);
  display: flex;
  align-items: center;
  gap: 10px;
}

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

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

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

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

.article-content blockquote {
  background: var(--primary-light);
  border-left: 4px solid var(--primary);
  padding: 16px 20px;
  border-radius: var(--radius-sm);
  margin: 24px 0;
  font-style: italic;
  color: var(--text-main);
}

.article-cta-box {
  background: var(--primary-gradient-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px;
  text-align: center;
  margin: 40px 0;
  box-shadow: var(--shadow-sm);
}

.article-cta-box h3 {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-main);
}

.article-cta-box p {
  color: var(--text-muted);
  margin-bottom: 20px;
  font-size: 0.98rem;
}

.related-articles {
  max-width: 840px;
  margin: 60px auto 0;
  padding-top: 40px;
  border-top: 1px solid var(--border-subtle);
}

/* --------------------------------------------------------------------------
   页脚 Footer
   -------------------------------------------------------------------------- */
.site-footer {
  background: #181C21;
  color: #9CA3AF;
  padding: 60px 0 30px;
  margin-top: 80px;
  font-size: 0.9rem;
}

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

.footer-brand .brand-logo {
  color: #FFFFFF;
  margin-bottom: 14px;
}

.footer-brand p {
  line-height: 1.6;
  max-width: 320px;
}

.footer-col h4 {
  color: #FFFFFF;
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 18px;
}

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

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

.footer-links a {
  color: #9CA3AF;
}

.footer-links a:hover {
  color: var(--primary);
}

.footer-bottom {
  padding-top: 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

/* --------------------------------------------------------------------------
   响应式适配 (Responsive Media Queries)
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
  .grid-pricing {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-card.popular {
    transform: none;
  }
  .grid-features, .grid-articles, .grid-audience {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .hero-title {
    font-size: 2.2rem;
  }
  .hero-subtitle {
    font-size: 1rem;
  }
  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
  }
  .grid-features, .grid-pricing, .grid-articles, .grid-audience {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  .nav-menu {
    display: none; /* 可拓展简易移动端菜单 */
  }
}

@media (max-width: 480px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .hero-cta {
    flex-direction: column;
    width: 100%;
  }
  .hero-cta .btn {
    width: 100%;
  }
}