/* ==========================================================================
   三番云 (sanfancloud.cyou) - 全局卡通云朵主题样式表
   ========================================================================== */

/* 引入 Google 字体 */
@import url('https://fonts.googleapis.com/css2?family=Comfortaa:wght@400;700&family=Noto+Sans+SC:wght@400;700;900&family=Outfit:wght@400;600;800&display=swap');

/* 变量声明 */
:root {
  --primary: #4facfe;
  --secondary: #00f2fe;
  --dark-blue: #1e3c72;
  --sky-bg: #e3f2fd;
  --sky-dark: #121e3d;
  --card-bg: rgba(255, 255, 255, 0.85);
  --card-border: rgba(255, 255, 255, 0.6);
  --text-main: #2c3e50;
  --text-muted: #5a738e;
  --cloud-white: #ffffff;
  --shadow-color: rgba(79, 172, 254, 0.2);
  --font-title: 'Comfortaa', 'Outfit', 'Noto Sans SC', sans-serif;
  --font-body: 'Outfit', 'Noto Sans SC', sans-serif;
}

/* 重置与基本样式 */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  color: var(--text-main);
  background: url('https://images.unsplash.com/photo-1504608524841-42fe6f032b4b?auto=format&fit=crop&w=1920&q=80') no-repeat center center fixed;
  background-size: cover;
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.6;
  position: relative;
}

body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(240, 246, 252, 0.72); /* 提高白蓝色调遮罩不透明度以极大增强全文文字对比度 */
  z-index: -1;
  pointer-events: none;
}


/* 背景云朵漂浮层 */
.sky-background {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -2;
  overflow: hidden;
  pointer-events: none;
}


.floating-cloud {
  position: absolute;
  background: white;
  border-radius: 100px;
  opacity: 0.65;
  filter: blur(1px);
  animation: float-drift infinite linear;
}

.floating-cloud::before, .floating-cloud::after {
  content: '';
  position: absolute;
  background: white;
  border-radius: 50%;
}

.cloud-1 {
  width: 120px;
  height: 40px;
  top: 15%;
  left: -150px;
  animation-duration: 35s;
}
.cloud-1::before { width: 50px; height: 50px; top: -20px; left: 15px; }
.cloud-1::after { width: 70px; height: 70px; top: -35px; right: 15px; }

.cloud-2 {
  width: 180px;
  height: 60px;
  top: 45%;
  left: -200px;
  animation-duration: 55s;
  animation-delay: -10s;
  opacity: 0.5;
}
.cloud-2::before { width: 80px; height: 80px; top: -35px; left: 25px; }
.cloud-2::after { width: 100px; height: 100px; top: -50px; right: 25px; }

.cloud-3 {
  width: 100px;
  height: 35px;
  top: 75%;
  left: -120px;
  animation-duration: 25s;
  animation-delay: -5s;
  opacity: 0.7;
}
.cloud-3::before { width: 40px; height: 40px; top: -15px; left: 10px; }
.cloud-3::after { width: 55px; height: 55px; top: -25px; right: 10px; }

@keyframes float-drift {
  0% { transform: translateX(-10%); }
  100% { transform: translateX(115vw); }
}

/* 排版与标题 */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-title);
  font-weight: 800;
  line-height: 1.3;
}

/* 天空蓝渐变字体 */
.sky-gradient-text {
  background: linear-gradient(135deg, #1fa2ff 0%, #12d6df 50%, #0072ff 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  display: inline-block;
}

/* 卡通云朵按钮 */
.cartoon-cloud-btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 40px;
  background: #ffffff;
  color: #0072ff !important;
  font-family: var(--font-title);
  font-weight: 900;
  font-size: 1.15rem;
  text-decoration: none;
  border: 4px solid #0072ff;
  border-radius: 50px;
  box-shadow: 0 8px 0 #0056b3, 0 15px 25px rgba(0, 114, 255, 0.15);
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  z-index: 1;
}

/* 云朵泡泡结构 */
.cartoon-cloud-btn::before {
  content: '';
  position: absolute;
  top: -15px;
  left: 20%;
  width: 28px;
  height: 28px;
  background: #ffffff;
  border-top: 4px solid #0072ff;
  border-left: 4px solid #0072ff;
  border-radius: 50%;
  z-index: -1;
  transition: all 0.25s ease;
}

.cartoon-cloud-btn::after {
  content: '';
  position: absolute;
  top: -20px;
  right: 25%;
  width: 36px;
  height: 36px;
  background: #ffffff;
  border-top: 4px solid #0072ff;
  border-right: 4px solid #0072ff;
  border-radius: 50%;
  z-index: -1;
  transition: all 0.25s ease;
}

/* 按钮悬停与交互 */
.cartoon-cloud-btn:hover {
  transform: translateY(-4px) scale(1.03);
  box-shadow: 0 12px 0 #0056b3, 0 20px 30px rgba(0, 114, 255, 0.2);
}

.cartoon-cloud-btn:hover::before {
  top: -18px;
  transform: scale(1.1);
}

.cartoon-cloud-btn:hover::after {
  top: -24px;
  transform: scale(1.1);
}

.cartoon-cloud-btn:active {
  transform: translateY(4px) scale(0.98);
  box-shadow: 0 4px 0 #0056b3, 0 5px 10px rgba(0, 114, 255, 0.1);
}

/* 辅色云朵按钮 */
.cartoon-cloud-btn.btn-secondary {
  background: #0072ff;
  color: #ffffff !important;
  border-color: #0056b3;
  box-shadow: 0 8px 0 #002d66, 0 15px 25px rgba(0, 0, 0, 0.1);
}

.cartoon-cloud-btn.btn-secondary::before,
.cartoon-cloud-btn.btn-secondary::after {
  background: #0072ff;
  border-color: #0056b3;
}

.cartoon-cloud-btn.btn-secondary:hover {
  box-shadow: 0 12px 0 #002d66, 0 20px 30px rgba(0, 0, 0, 0.15);
}

.cartoon-cloud-btn.btn-secondary:active {
  box-shadow: 0 4px 0 #002d66;
}

/* 卡通云朵按钮内部文本保护 */
.cartoon-cloud-btn span {
  position: relative;
  z-index: 10; /* 强行置于云朵伪元素之上，解决文字遮挡问题 */
}

/* 导航栏 */
.navbar {
  position: sticky;
  top: 0;
  width: 100%;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 3px solid rgba(179, 229, 252, 0.5);
  z-index: 1000;
  padding: 15px 5%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: all 0.3s ease;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-title);
  font-size: 1.6rem;
  font-weight: 900;
  text-decoration: none;
  color: var(--dark-blue);
}

.navbar-brand svg {
  fill: var(--primary);
  filter: drop-shadow(0 2px 4px rgba(79, 172, 254, 0.3));
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 30px;
  align-items: center;
}

.nav-link {
  font-family: var(--font-body);
  font-weight: 700;
  color: var(--text-main);
  text-decoration: none;
  font-size: 1.05rem;
  transition: color 0.2s ease;
  position: relative;
}

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

.nav-link::after {
  content: '';
  position: absolute;
  width: 0;
  height: 4px;
  bottom: -6px;
  left: 0;
  background: var(--primary);
  border-radius: 2px;
  transition: width 0.2s ease;
}

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

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 25px;
  height: 3px;
  background: var(--dark-blue);
  margin: 5px 0;
  border-radius: 2px;
  transition: 0.3s ease;
}

/* 头部 Banner (Hero Section) */
.hero {
  padding: 80px 5% 60px 5%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1200px;
  margin: 0 auto;
  gap: 40px;
  position: relative;
}

.hero-content {
  flex: 1;
  max-width: 600px;
  background: rgba(255, 255, 255, 0.9); /* 高对比度毛玻璃背板 */
  backdrop-filter: blur(15px);
  -webkit-backdrop-filter: blur(15px);
  border: 3px solid rgba(255, 255, 255, 0.95);
  border-radius: 32px;
  padding: 40px;
  box-shadow: 0 20px 50px rgba(0, 114, 255, 0.08);
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #0072ff; /* 换成实色高对比背景 */
  border: 2px solid #0056b3;
  color: #ffffff; /* 白色高对比文字 */
  padding: 8px 16px;
  border-radius: 30px;
  font-weight: 800;
  font-size: 0.9rem;
  margin-bottom: 25px;
  font-family: var(--font-title);
  box-shadow: 0 4px 15px rgba(0, 114, 255, 0.2);
}

.hero-badge svg {
  animation: float 2s infinite ease-in-out;
}

.hero h1 {
  font-size: 3.5rem;
  margin-bottom: 20px;
  line-height: 1.2;
}

.hero p {
  font-size: 1.2rem;
  color: var(--text-muted);
  margin-bottom: 35px;
  max-width: 500px;
}

.hero-actions {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.hero-image {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
}

/* 巨幅卡通云朵插图 */
.hero-cloud-svg {
  width: 100%;
  max-width: 450px;
  filter: drop-shadow(0 20px 30px rgba(79, 172, 254, 0.25));
  animation: float 4s infinite ease-in-out;
}

@keyframes float {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-15px); }
}

/* 核心特色部分 (Features) */
.features {
  padding: 80px 5%;
  max-width: 1200px;
  margin: 0 auto;
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 60px auto;
}

.section-header h2 {
  font-size: 2.5rem;
  margin-bottom: 15px;
}

.section-header p {
  font-size: 1.1rem;
  color: var(--text-muted);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
}

.feature-card {
  background: var(--card-bg);
  border: 3px solid var(--card-border);
  border-radius: 24px;
  padding: 40px 30px;
  text-align: center;
  box-shadow: 0 10px 30px rgba(0, 114, 255, 0.04);
  transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.feature-card:hover {
  transform: translateY(-8px);
  border-color: var(--primary);
  box-shadow: 0 15px 35px rgba(79, 172, 254, 0.15);
}

.feature-icon {
  width: 80px;
  height: 80px;
  background: linear-gradient(135deg, #e3f2fd 0%, #bbdefb 100%);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 25px auto;
  border: 3px solid #90caf9;
  box-shadow: 0 4px 10px rgba(144, 202, 249, 0.2);
}

.feature-icon svg {
  fill: var(--primary);
}

.feature-card h3 {
  font-size: 1.4rem;
  margin-bottom: 15px;
  color: var(--dark-blue);
}

.feature-card p {
  color: var(--text-muted);
  font-size: 0.98rem;
}

/* 套餐价格部分 (Pricing) */
.pricing {
  padding: 80px 5%;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0) 0%, rgba(225, 245, 254, 0.6) 50%, rgba(255, 255, 255, 0) 100%);
  position: relative;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 30px;
  max-width: 1200px;
  margin: 0 auto;
}

.pricing-card {
  background: var(--card-bg);
  border: 3px solid var(--card-border);
  border-radius: 28px;
  padding: 40px 30px;
  display: flex;
  flex-direction: column;
  position: relative;
  box-shadow: 0 10px 30px rgba(0, 114, 255, 0.03);
  transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  overflow: hidden;
}

.pricing-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 20px 40px rgba(79, 172, 254, 0.18);
}

.pricing-card.featured {
  border-color: var(--primary);
  background: linear-gradient(180deg, #ffffff 0%, #f4faff 100%);
}

.pricing-card.featured::before {
  content: 'HOT';
  position: absolute;
  top: 15px;
  right: -30px;
  background: var(--primary);
  color: white;
  font-weight: 900;
  font-size: 0.75rem;
  padding: 4px 30px;
  transform: rotate(45deg);
  box-shadow: 0 2px 8px rgba(79, 172, 254, 0.3);
}

.pricing-badge {
  align-self: flex-start;
  background: #e3f2fd;
  color: var(--primary);
  border: 2px solid #bbdefb;
  border-radius: 20px;
  padding: 4px 14px;
  font-weight: 800;
  font-size: 0.85rem;
  margin-bottom: 20px;
  font-family: var(--font-title);
}

.pricing-card.featured .pricing-badge {
  background: #bbdefb;
  border-color: #90caf9;
  color: var(--dark-blue);
}

.pricing-card h3 {
  font-size: 1.8rem;
  color: var(--dark-blue);
  margin-bottom: 15px;
}

.pricing-price {
  margin-bottom: 25px;
  display: flex;
  align-items: baseline;
}

.pricing-price .currency {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--primary);
}

.pricing-price .amount {
  font-size: 3rem;
  font-weight: 900;
  font-family: var(--font-title);
  color: var(--dark-blue);
  line-height: 1;
}

.pricing-price .period {
  color: var(--text-muted);
  font-size: 1rem;
  margin-left: 5px;
}

.pricing-features {
  list-style: none;
  margin-bottom: 35px;
  flex-grow: 1;
}

.pricing-features li {
  padding: 10px 0;
  font-size: 0.98rem;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 10px;
  border-bottom: 1px dashed rgba(179, 229, 252, 0.4);
}

.pricing-features li:last-child {
  border-bottom: none;
}

.pricing-features li svg {
  fill: #4caf50;
  flex-shrink: 0;
}

/* 机场推荐文章区 (Articles Grid) */
.articles-section {
  padding: 80px 5%;
  max-width: 1200px;
  margin: 0 auto;
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 30px;
}

.article-card {
  background: var(--card-bg);
  border: 3px solid var(--card-border);
  border-radius: 24px;
  overflow: hidden;
  box-shadow: 0 10px 30px rgba(0, 114, 255, 0.02);
  transition: all 0.3s ease;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  display: flex;
  flex-direction: column;
}

.article-card:hover {
  transform: translateY(-6px);
  border-color: var(--primary);
  box-shadow: 0 15px 35px rgba(79, 172, 254, 0.12);
}

.article-body {
  padding: 30px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.article-tag {
  display: inline-block;
  align-self: flex-start;
  background: #e1f5fe;
  color: #0288d1;
  font-size: 0.8rem;
  font-weight: 800;
  padding: 4px 12px;
  border-radius: 12px;
  margin-bottom: 15px;
  text-transform: uppercase;
}

.article-body h3 {
  font-size: 1.25rem;
  margin-bottom: 12px;
  color: var(--dark-blue);
}

.article-body h3 a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s ease;
}

.article-body h3 a:hover {
  color: var(--primary);
}

.article-excerpt {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 25px;
  flex-grow: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 15px;
  border-top: 1px solid rgba(179, 229, 252, 0.4);
}

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

.article-link {
  font-size: 0.95rem;
  font-weight: 800;
  color: var(--primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 5px;
}

.article-link:hover {
  color: var(--secondary);
}

/* 用户评价区 (Testimonials) */
.testimonials {
  padding: 80px 5%;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0) 0%, rgba(225, 245, 254, 0.4) 100%);
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
  max-width: 1200px;
  margin: 0 auto;
}

.testimonial-card {
  background: var(--card-bg);
  border: 3px solid var(--card-border);
  border-radius: 24px;
  padding: 35px 30px;
  box-shadow: 0 10px 30px rgba(0, 114, 255, 0.02);
  transition: all 0.3s ease;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  position: relative;
}

.testimonial-card::before {
  content: '“';
  position: absolute;
  top: 10px;
  left: 20px;
  font-size: 5rem;
  color: rgba(79, 172, 254, 0.15);
  font-family: Georgia, serif;
  line-height: 1;
}

.testimonial-text {
  font-size: 1rem;
  color: var(--text-main);
  margin-bottom: 25px;
  position: relative;
  z-index: 1;
}

.testimonial-user {
  display: flex;
  align-items: center;
  gap: 15px;
}

.avatar-cloud {
  width: 50px;
  height: 50px;
  background: linear-gradient(135deg, #b3e5fc 0%, #81d4fa 100%);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  color: white;
  border: 2px solid white;
  box-shadow: 0 4px 10px rgba(0, 114, 255, 0.1);
  font-size: 1.2rem;
  font-family: var(--font-title);
}

.user-info h4 {
  font-size: 1rem;
  color: var(--dark-blue);
  margin-bottom: 3px;
}

.user-info .user-plan {
  font-size: 0.85rem;
  color: var(--primary);
  font-weight: 700;
}

/* 常见问题区 (FAQ Accordion) */
.faq {
  padding: 80px 5% 100px 5%;
  max-width: 800px;
  margin: 0 auto;
}

.faq-container {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.faq-item {
  background: var(--card-bg);
  border: 3px solid var(--card-border);
  border-radius: 20px;
  overflow: hidden;
  box-shadow: 0 6px 20px rgba(0, 114, 255, 0.02);
  transition: all 0.3s ease;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

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

.faq-question {
  width: 100%;
  padding: 22px 30px;
  background: none;
  border: none;
  text-align: left;
  font-family: var(--font-title);
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--dark-blue);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 15px;
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
  padding: 0 30px;
  color: var(--text-muted);
  font-size: 1rem;
}

.faq-item.active .faq-answer {
  max-height: 1000px;
  padding-bottom: 25px;
  transition: max-height 0.5s ease-in-out;
}

.faq-icon-cloud {
  width: 32px;
  height: 32px;
  background: #e3f2fd;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
  border: 2px solid #bbdefb;
}

.faq-icon-cloud svg {
  fill: var(--primary);
  transition: transform 0.3s ease;
}

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

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

/* 页脚 (Footer) */
.footer {
  background: var(--sky-dark);
  color: #cfd8dc;
  padding: 80px 5% 40px 5%;
  border-top: 5px solid var(--primary);
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 50px;
  margin-bottom: 60px;
}

.footer-info h3 {
  color: white;
  font-family: var(--font-title);
  font-size: 1.6rem;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.footer-info p {
  font-size: 0.95rem;
  line-height: 1.7;
}

.footer-links h4 {
  color: white;
  font-size: 1.15rem;
  margin-bottom: 25px;
  position: relative;
}

.footer-links h4::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -8px;
  width: 30px;
  height: 3px;
  background: var(--primary);
  border-radius: 2px;
}

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

.footer-links li {
  margin-bottom: 15px;
}

.footer-links a {
  color: #b0bec5;
  text-decoration: none;
  transition: all 0.2s ease;
  font-size: 0.95rem;
}

.footer-links a:hover {
  color: var(--primary);
  padding-left: 5px;
}

.footer-bottom {
  max-width: 1200px;
  margin: 0 auto;
  padding-top: 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
  font-size: 0.9rem;
  color: #90a4ae;
}

.footer-bottom a {
  color: #90a4ae;
  text-decoration: none;
  transition: color 0.2s ease;
}

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

/* ==========================================================================
   文章页面专用样式
   ========================================================================== */
.article-page {
  background: linear-gradient(180deg, #b3e5fc 0%, #f5fbfd 15%, #ffffff 50%, #ffffff 100%);
}

.article-header {
  padding: 80px 5% 40px 5%;
  text-align: center;
  max-width: 900px;
  margin: 0 auto;
}

.article-header-meta {
  display: flex;
  justify-content: center;
  gap: 20px;
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

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

.article-header-meta svg {
  fill: var(--text-muted);
}

.article-title {
  font-size: 2.8rem;
  color: var(--dark-blue);
  margin-bottom: 25px;
  line-height: 1.25;
}

.article-container {
  max-width: 850px;
  margin: 0 auto;
  padding: 0 5% 80px 5%;
  display: flex;
  flex-direction: column;
  gap: 30px;
}

.article-content {
  background: white;
  border: 3px solid var(--card-border);
  border-radius: 28px;
  padding: 50px 40px;
  box-shadow: 0 15px 40px rgba(0, 114, 255, 0.03);
}

.article-content p {
  font-size: 1.1rem;
  color: #37474f;
  margin-bottom: 25px;
  line-height: 1.8;
  text-align: justify;
}

.article-content h2 {
  font-size: 1.8rem;
  color: var(--dark-blue);
  margin: 45px 0 20px 0;
  padding-bottom: 10px;
  border-bottom: 3px dashed rgba(179, 229, 252, 0.6);
}

.article-content h2:first-of-type {
  margin-top: 15px;
}

.article-content h3 {
  font-size: 1.35rem;
  color: #0277bd;
  margin: 30px 0 15px 0;
}

.article-content ul, .article-content ol {
  margin-bottom: 25px;
  padding-left: 30px;
}

.article-content li {
  font-size: 1.05rem;
  color: #37474f;
  margin-bottom: 12px;
  line-height: 1.7;
}

.article-content strong {
  color: var(--dark-blue);
}

.article-content blockquote {
  background: #f1f8ff;
  border-left: 6px solid var(--primary);
  border-radius: 4px;
  padding: 20px 25px;
  margin: 30px 0;
  font-style: italic;
}

.article-content blockquote p {
  margin-bottom: 0;
  color: #455a64;
}

/* 文章页呼吁注册横幅 */
.article-cta {
  background: linear-gradient(135deg, #e3f2fd 0%, #b3e5fc 100%);
  border: 3px solid #81d4fa;
  border-radius: 24px;
  padding: 40px;
  text-align: center;
  margin: 40px 0;
  box-shadow: 0 10px 30px rgba(79, 172, 254, 0.1);
  position: relative;
  overflow: hidden;
}

.article-cta::after {
  content: '';
  position: absolute;
  width: 150px;
  height: 150px;
  background: rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  bottom: -50px;
  right: -50px;
  z-index: 0;
}

.article-cta-content {
  position: relative;
  z-index: 1;
}

.article-cta h3 {
  font-size: 1.7rem;
  color: var(--dark-blue);
  margin-bottom: 15px;
}

.article-cta p {
  font-size: 1.05rem;
  color: var(--text-muted);
  margin-bottom: 25px;
}

.article-navigation {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
  margin-top: 40px;
}

.nav-article-card {
  flex: 1;
  min-width: 280px;
  background: white;
  border: 2px solid var(--card-border);
  border-radius: 16px;
  padding: 20px;
  text-decoration: none;
  color: var(--text-main);
  transition: all 0.2s ease;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.02);
}

.nav-article-card:hover {
  border-color: var(--primary);
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(79, 172, 254, 0.08);
}

.nav-article-label {
  font-size: 0.8rem;
  font-weight: 800;
  color: var(--primary);
  text-transform: uppercase;
  margin-bottom: 5px;
}

.nav-article-title {
  font-weight: 700;
  font-size: 0.95rem;
  line-height: 1.4;
  color: var(--dark-blue);
}

/* ==========================================================================
   媒体查询与响应式适配
   ========================================================================== */
@media (max-width: 992px) {
  .hero {
    flex-direction: column;
    text-align: center;
    padding-top: 60px;
  }
  .hero-content {
    max-width: 100%;
  }
  .hero p {
    margin: 0 auto 35px auto;
  }
  .hero-actions {
    justify-content: center;
  }
  .hero-image {
    width: 100%;
  }
  .hero-cloud-svg {
    max-width: 350px;
  }
  .article-title {
    font-size: 2.2rem;
  }
}

@media (max-width: 768px) {
  .navbar {
    padding: 15px 20px;
  }
  .nav-menu {
    position: fixed;
    top: 75px;
    left: -100%;
    width: 100%;
    height: calc(100vh - 75px);
    background: white;
    flex-direction: column;
    padding: 40px 20px;
    gap: 25px;
    transition: left 0.3s cubic-bezier(0.77, 0.2, 0.05, 1);
    box-shadow: 0 10px 20px rgba(0,0,0,0.05);
    border-top: 3px solid rgba(179, 229, 252, 0.5);
  }
  .nav-menu.active {
    left: 0;
  }
  .nav-toggle {
    display: block;
  }
  .nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }
  .nav-toggle.active span:nth-child(2) {
    opacity: 0;
  }
  .nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
  }
  .hero h1 {
    font-size: 2.5rem;
  }
  .section-header h2 {
    font-size: 2rem;
  }
  .article-content {
    padding: 30px 20px;
  }
  .article-content h2 {
    font-size: 1.5rem;
  }
  .article-title {
    font-size: 1.8rem;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 2.1rem;
  }
  .cartoon-cloud-btn {
    width: 100%;
    padding: 12px 20px;
  }
  .hero-actions {
    flex-direction: column;
    gap: 15px;
    width: 100%;
  }
  .navbar-brand {
    font-size: 1.3rem;
  }
}