/* ==========================================================================
   拼好连机场 (PinHaoLian Airport) - 全站设计系统与样式表
   全站统一色系: 深青绿 #0F766E + 耀眼亮青 #06B6D4 + 翠绿 #10B981
   ========================================================================== */

/* 1. CSS 变量与设计 Token */
:root {
  --primary: #0F766E;
  --primary-hover: #0D9488;
  --primary-light: #CCFBF1;
  --primary-glow: rgba(15, 118, 110, 0.25);
  
  --secondary: #06B6D4;
  --secondary-hover: #0891B2;
  
  --accent: #10B981;
  --accent-pink: #EC4899;
  --accent-gold: #F59E0B;
  
  --bg-main: #F8FAFC;
  --bg-alt: #F1F5F9;
  --bg-gradient: linear-gradient(135deg, #F0FDF4 0%, #E0F2FE 50%, #F8FAFC 100%);
  
  --card-bg: #FFFFFF;
  --card-glass: rgba(255, 255, 255, 0.88);
  
  --text-main: #0F172A;
  --text-secondary: #475569;
  --text-muted: #64748B;
  
  --border-light: #E2E8F0;
  --border-focus: #99F6E4;
  
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 24px;
  --radius-pill: 9999px;
  
  --shadow-sm: 0 4px 6px -1px rgba(15, 118, 110, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
  --shadow-md: 0 10px 25px -5px rgba(15, 118, 110, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 20px 35px -10px rgba(15, 118, 110, 0.15), 0 12px 16px -8px rgba(0, 0, 0, 0.04);
  
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --container-width: 1240px;
}

/* 2. 基础重置 (Reset & Typography) */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  position: relative;
}

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

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

ul {
  list-style: none;
}

/* 布局容器 */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 2;
}

.section {
  padding: 90px 0;
  position: relative;
  z-index: 1;
}

.section-alt {
  background: var(--bg-alt);
}

.section-gradient {
  background: var(--bg-gradient);
}

/* 3. 动态背景点缀与背景动态点赞容器 */
.ambient-bg-effects {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.ambient-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.45;
  animation: orbFloat 14s ease-in-out infinite alternate;
}

.ambient-orb-1 {
  top: -100px;
  right: -100px;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, #06B6D4 0%, rgba(6, 182, 212, 0) 70%);
}

.ambient-orb-2 {
  bottom: 10%;
  left: -150px;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, #0F766E 0%, rgba(15, 118, 110, 0) 70%);
  animation-delay: -7s;
}

@keyframes orbFloat {
  0% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(30px, 50px) scale(1.1); }
  100% { transform: translate(-20px, 80px) scale(0.95); }
}

/* 动态点赞 (Floating Hearts / Thumbs-up in Background) */
#floating-likes-container {
  position: fixed;
  bottom: 0;
  right: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 99;
  overflow: hidden;
}

.floating-like-particle {
  position: absolute;
  bottom: -40px;
  font-size: 1.5rem;
  opacity: 0.85;
  animation: floatUpLike 4s cubic-bezier(0.25, 1, 0.5, 1) forwards;
  filter: drop-shadow(0 4px 10px rgba(6, 182, 212, 0.3));
  user-select: none;
}

@keyframes floatUpLike {
  0% {
    transform: translateY(0) scale(0.6) rotate(0deg);
    opacity: 1;
  }
  50% {
    opacity: 0.9;
  }
  100% {
    transform: translateY(-90vh) scale(1.2) rotate(25deg);
    opacity: 0;
  }
}

/* 动态点赞悬浮按钮 */
.floating-like-widget {
  position: fixed;
  bottom: 30px;
  right: 30px;
  z-index: 999;
  display: flex;
  align-items: center;
  gap: 10px;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(15, 118, 110, 0.2);
  padding: 8px 16px 8px 12px;
  border-radius: var(--radius-pill);
  box-shadow: var(--shadow-lg);
  cursor: pointer;
  transition: var(--transition);
  user-select: none;
}

.floating-like-widget:hover {
  transform: translateY(-4px) scale(1.05);
  box-shadow: 0 15px 30px rgba(15, 118, 110, 0.25);
  border-color: var(--primary);
}

.like-icon-circle {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #FFFFFF;
  font-size: 1rem;
  box-shadow: 0 4px 10px rgba(15, 118, 110, 0.3);
  animation: pulseLike 2s infinite;
}

@keyframes pulseLike {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.12); }
}

.like-text-group {
  display: flex;
  flex-direction: column;
}

.like-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-weight: 600;
}

.like-count {
  font-size: 0.95rem;
  font-weight: 800;
  color: var(--primary);
}

/* 4. 头部与导航栏 (Header Nav) */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  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: var(--transition);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: -0.5px;
}

.logo-icon {
  width: 42px;
  height: 42px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  box-shadow: var(--shadow-sm);
}

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

.nav-menu {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-link {
  font-weight: 600;
  font-size: 0.98rem;
  color: var(--text-secondary);
  position: relative;
  padding: 6px 0;
}

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

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--primary);
  border-radius: var(--radius-pill);
}

.nav-cta {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* 按钮组件 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 26px;
  font-size: 0.98rem;
  font-weight: 700;
  border-radius: var(--radius-pill);
  cursor: pointer;
  border: none;
  transition: var(--transition);
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, #0D9488 100%);
  color: #FFFFFF;
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg), 0 0 20px var(--primary-glow);
  color: #FFFFFF;
}

.btn-secondary {
  background: #FFFFFF;
  color: var(--primary);
  border: 2px solid #CCFBF1;
  box-shadow: var(--shadow-sm);
}

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

.btn-outline {
  background: transparent;
  color: var(--text-main);
  border: 1px solid var(--border-light);
}

.btn-outline:hover {
  background: var(--bg-alt);
  border-color: var(--primary);
  color: var(--primary);
}

.btn-sm {
  padding: 8px 18px;
  font-size: 0.88rem;
}

.btn-lg {
  padding: 16px 36px;
  font-size: 1.1rem;
}

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.6rem;
  color: var(--text-main);
  cursor: pointer;
}

/* 5. 首屏 Hero 区域 */
.hero {
  padding-top: 150px;
  padding-bottom: 90px;
  background: var(--bg-gradient);
  position: relative;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(15, 118, 110, 0.08);
  border: 1px solid rgba(15, 118, 110, 0.2);
  border-radius: var(--radius-pill);
  color: var(--primary);
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 24px;
}

.hero-badge .pulse-dot {
  width: 8px;
  height: 8px;
  background-color: var(--accent);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--accent);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 10px rgba(16, 185, 129, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.hero-title {
  font-size: 3.2rem;
  font-weight: 900;
  line-height: 1.2;
  color: var(--text-main);
  margin-bottom: 20px;
  letter-spacing: -1px;
}

.hero-title span {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.18rem;
  color: var(--text-secondary);
  margin-bottom: 36px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-bottom: 40px;
}

.hero-features-list {
  display: flex;
  gap: 24px;
  border-top: 1px solid var(--border-light);
  padding-top: 24px;
}

.hero-feature-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-secondary);
}

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

.hero-illustration-wrapper {
  position: relative;
}

.hero-illustration-wrapper img {
  width: 100%;
  filter: drop-shadow(0 20px 30px rgba(15, 118, 110, 0.15));
  animation: float 6s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-12px); }
}

/* 6. 标头与通用文本模块 */
.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 60px auto;
}

.section-tag {
  display: inline-block;
  font-size: 0.88rem;
  font-weight: 800;
  text-transform: uppercase;
  color: var(--primary);
  letter-spacing: 1.5px;
  margin-bottom: 12px;
}

.section-title {
  font-size: 2.3rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}

.section-desc {
  font-size: 1.08rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* 7. 核心优势模块 (Features) */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 32px;
}

.feature-card {
  background: var(--card-bg);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  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: linear-gradient(90deg, var(--primary), var(--secondary));
  opacity: 0;
  transition: var(--transition);
}

.feature-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: var(--border-focus);
}

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

.feature-icon {
  width: 64px;
  height: 64px;
  border-radius: 18px;
  background: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
}

.feature-icon svg {
  width: 32px;
  height: 32px;
  stroke-width: 2.2;
}

.feature-title {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-main);
}

.feature-text {
  color: var(--text-secondary);
  font-size: 0.98rem;
  line-height: 1.65;
}

/* 8. 套餐价格模块 (Pricing Plans - 统一极速青绿全站色系) */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 30px;
  align-items: stretch;
}

.pricing-card {
  background: #FFFFFF;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  box-shadow: 0 10px 30px rgba(15, 118, 110, 0.05);
  display: flex;
  flex-direction: column;
  position: relative;
  transition: var(--transition);
  overflow: hidden;
}

.pricing-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 20px 40px rgba(15, 118, 110, 0.15);
  border-color: var(--border-focus);
}

.pricing-card.featured {
  border: 2px solid var(--primary);
  box-shadow: 0 15px 35px rgba(15, 118, 110, 0.18);
}

.pricing-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.pricing-card-title {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-main);
}

.stock-badge {
  background: #E6F4EA;
  color: #137333;
  font-size: 0.82rem;
  font-weight: 700;
  padding: 4px 14px;
  border-radius: var(--radius-pill);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.recommend-ribbon {
  position: absolute;
  top: 18px;
  right: -32px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  color: #FFFFFF;
  font-size: 0.75rem;
  font-weight: 800;
  padding: 4px 35px;
  transform: rotate(45deg);
  box-shadow: 0 2px 8px rgba(15, 118, 110, 0.3);
}

.price-box {
  background: #F0FDF4;
  border: 1px solid #CCFBF1;
  border-radius: var(--radius-md);
  padding: 24px;
  text-align: center;
  margin-bottom: 20px;
}

.price-main {
  font-size: 3rem;
  font-weight: 900;
  color: var(--text-main);
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 2px;
  line-height: 1;
}

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

.price-period {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-left: 4px;
}

.billing-cycles-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 6px;
  margin-top: 14px;
  font-size: 0.8rem;
}

.cycle-pill {
  padding: 3px 8px;
  border-radius: 6px;
  color: #94A3B8;
  font-weight: 600;
}

.cycle-pill.active {
  background: #CCFBF1;
  color: var(--primary);
  font-weight: 700;
}

.discount-note-banner {
  background: #F0FDF4;
  border: 1px dashed #99F6E4;
  border-radius: var(--radius-sm);
  padding: 10px;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

.discount-note-banner strong {
  color: var(--primary);
}

.plan-features-list {
  margin-bottom: 32px;
  flex-grow: 1;
}

.plan-features-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 12px;
  font-size: 0.94rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.plan-features-list li svg {
  color: var(--accent);
  flex-shrink: 0;
  margin-top: 2px;
}

.btn-buy-teal {
  display: block;
  width: 100%;
  padding: 14px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  color: #FFFFFF;
  font-size: 1.05rem;
  font-weight: 800;
  text-align: center;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: 0 4px 14px rgba(15, 118, 110, 0.3);
  text-decoration: none;
}

.btn-buy-teal:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(15, 118, 110, 0.45);
  color: #FFFFFF;
}

/* 保留按兼容类名 */
.btn-buy-coral {
  display: block;
  width: 100%;
  padding: 14px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  color: #FFFFFF;
  font-size: 1.05rem;
  font-weight: 800;
  text-align: center;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: 0 4px 14px rgba(15, 118, 110, 0.3);
  text-decoration: none;
}

.btn-buy-coral:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(15, 118, 110, 0.45);
  color: #FFFFFF;
}

/* 9. 适合人群模块 (Target Audience) */
.audience-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
}

.audience-card {
  background: var(--card-bg);
  border-radius: var(--radius-md);
  padding: 30px 24px;
  border: 1px solid var(--border-light);
  text-align: center;
  transition: var(--transition);
}

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

.audience-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 18px auto;
  background: var(--primary-light);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
}

.audience-icon svg {
  width: 28px;
  height: 28px;
  stroke-width: 2.2;
}

.audience-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 8px;
}

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

/* 10. Clash 教程板块 (Tutorial Showcase) */
.tutorial-box {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-light);
  padding: 48px;
  box-shadow: var(--shadow-md);
}

.tutorial-tabs {
  display: flex;
  gap: 12px;
  margin-bottom: 36px;
  border-bottom: 2px solid var(--border-light);
  padding-bottom: 12px;
  overflow-x: auto;
}

.tab-btn {
  padding: 10px 22px;
  font-weight: 700;
  font-size: 0.95rem;
  border: none;
  background: none;
  color: var(--text-muted);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  white-space: nowrap;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.tab-btn.active {
  background: var(--primary-light);
  color: var(--primary);
}

.tutorial-content-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}

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

.step-item {
  display: flex;
  gap: 20px;
}

.step-number {
  width: 38px;
  height: 38px;
  background: var(--primary);
  color: #FFFFFF;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  flex-shrink: 0;
}

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

.step-info p {
  font-size: 0.94rem;
  color: var(--text-secondary);
}

/* 11. 用户评价模块 (User Reviews) */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 28px;
}

.review-card {
  background: var(--card-bg);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.review-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}

.review-stars {
  color: #F59E0B;
  display: flex;
  gap: 4px;
  margin-bottom: 16px;
}

.review-stars svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

.review-text {
  font-size: 0.98rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 24px;
  font-style: italic;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 14px;
}

.avatar-circle {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  color: #FFF;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.1rem;
}

.author-name {
  font-weight: 700;
  font-size: 1rem;
  color: var(--text-main);
}

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

/* 12. FAQ 折叠手风琴 */
.faq-accordion {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

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

.faq-question {
  padding: 22px 28px;
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
}

.faq-question svg {
  transition: transform 0.3s ease;
  color: var(--primary);
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
  background: #F8FAFC;
}

.faq-item.active .faq-answer {
  max-height: 500px;
  transition: max-height 0.3s ease-in-out;
  border-top: 1px solid var(--border-light);
}

.faq-answer-inner {
  padding: 22px 28px;
  font-size: 0.98rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* 13. 文章站 / 博客网格 (Articles Grid) */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 32px;
}

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

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

.article-body {
  padding: 28px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.article-tag {
  background: var(--primary-light);
  color: var(--primary);
  font-weight: 700;
  padding: 2px 10px;
  border-radius: var(--radius-pill);
}

.article-title {
  font-size: 1.22rem;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.4;
  margin-bottom: 12px;
}

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

.article-excerpt {
  font-size: 0.94rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 20px;
  flex-grow: 1;
}

.article-link {
  font-weight: 700;
  font-size: 0.92rem;
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

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

/* 14. 文章详情页深度样式 */
.article-detail-header {
  padding-top: 140px;
  padding-bottom: 40px;
  background: var(--bg-gradient);
  border-bottom: 1px solid var(--border-light);
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 20px;
}

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

.article-detail-title {
  font-size: 2.4rem;
  font-weight: 900;
  color: var(--text-main);
  line-height: 1.3;
  margin-bottom: 20px;
}

.article-content {
  max-width: 860px;
  margin: 0 auto;
  padding: 60px 0;
  font-size: 1.08rem;
  color: var(--text-main);
  line-height: 1.85;
}

.article-content h2 {
  font-size: 1.7rem;
  font-weight: 800;
  color: var(--text-main);
  margin: 44px 0 22px 0;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--primary-light);
  display: flex;
  align-items: center;
  gap: 10px;
}

.article-content h3 {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--primary);
  margin: 32px 0 16px 0;
}

.article-content p {
  margin-bottom: 22px;
  color: var(--text-secondary);
}

.article-content ul, .article-content ol {
  margin-bottom: 28px;
  padding-left: 24px;
  color: var(--text-secondary);
}

.article-content li {
  margin-bottom: 12px;
}

/* 丰富文本表格样式 */
.article-table {
  width: 100%;
  border-collapse: collapse;
  margin: 30px 0;
  font-size: 0.96rem;
  box-shadow: var(--shadow-sm);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.article-table th {
  background: var(--primary);
  color: #FFFFFF;
  padding: 14px 18px;
  text-align: left;
  font-weight: 700;
}

.article-table td {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border-light);
  background: var(--card-bg);
}

.article-table tr:nth-child(even) td {
  background: var(--bg-alt);
}

/* 代码与配置框样式 */
.code-block {
  background: #0F172A;
  color: #38BDF8;
  padding: 20px 24px;
  border-radius: var(--radius-md);
  font-family: monospace;
  font-size: 0.92rem;
  line-height: 1.6;
  margin: 24px 0;
  overflow-x: auto;
  box-shadow: var(--shadow-md);
}

.article-cta-box {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  color: #FFFFFF;
  border-radius: var(--radius-lg);
  padding: 40px;
  text-align: center;
  margin: 50px 0;
  box-shadow: var(--shadow-lg);
}

.article-cta-box h3 {
  font-size: 1.8rem;
  color: #FFFFFF;
  margin-bottom: 12px;
}

.article-cta-box p {
  font-size: 1.05rem;
  opacity: 0.95;
  margin-bottom: 24px;
}

/* 15. 全站 Bottom CTA Banner */
.cta-banner {
  background: linear-gradient(135deg, #0F766E 0%, #0F172A 100%);
  color: #FFFFFF;
  border-radius: var(--radius-lg);
  padding: 60px 40px;
  text-align: center;
  box-shadow: var(--shadow-lg);
}

.cta-banner h2 {
  font-size: 2.4rem;
  font-weight: 900;
  margin-bottom: 16px;
}

.cta-banner p {
  font-size: 1.1rem;
  color: #94A3B8;
  max-width: 600px;
  margin: 0 auto 32px auto;
}

/* 16. 页脚底栏 (Footer) */
.footer {
  background: #0F172A;
  color: #94A3B8;
  padding-top: 80px;
  padding-bottom: 40px;
  position: relative;
  z-index: 2;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 60px;
}

.footer-brand .logo {
  color: #FFFFFF;
  margin-bottom: 16px;
}

.footer-bio {
  font-size: 0.94rem;
  line-height: 1.7;
  color: #64748B;
  margin-bottom: 24px;
}

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

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 12px;
  font-size: 0.92rem;
}

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

.footer-bottom {
  border-top: 1px solid #1E293B;
  padding-top: 30px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.88rem;
  color: #64748B;
}

/* 17. 移动端响应式 (Responsive) */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .hero-actions {
    justify-content: center;
  }
  .hero-features-list {
    justify-content: center;
  }
  .tutorial-content-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    display: none;
    position: absolute;
    top: 76px;
    left: 0;
    width: 100%;
    background: #FFFFFF;
    flex-direction: column;
    padding: 24px;
    border-bottom: 1px solid var(--border-light);
    box-shadow: var(--shadow-md);
  }
  .nav-menu.active {
    display: flex;
  }
  .mobile-toggle {
    display: block;
  }
  .hero-title {
    font-size: 2.2rem;
  }
  .section-title {
    font-size: 1.8rem;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }
  .floating-like-widget {
    bottom: 20px;
    right: 20px;
    padding: 6px 12px;
  }
}