/* 
  一分机场 (yifenjc.homes) 全局样式表
  风格: 浅色系科技风 (Light Tech Style)
  特点: 优雅的网格背景、磨砂玻璃效果、渐变按钮、平滑过渡、卓越的SEO排版支持
*/

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;500;600;700;800&display=swap');

:root {
  /* 调色盘 */
  --primary: #2563eb;          /* 科技蓝 */
  --primary-hover: #1d4ed8;
  --primary-glow: rgba(37, 99, 235, 0.12);
  --accent: #0d9488;           /* 极光青 */
  --accent-glow: rgba(13, 148, 136, 0.12);
  --gradient-tech: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  --gradient-glow: linear-gradient(135deg, rgba(37, 99, 235, 0.05) 0%, rgba(13, 148, 136, 0.05) 100%);
  
  /* 中性色 */
  --bg-base: #f8fafc;          /* 科技柔灰 */
  --bg-card: #ffffff;          /* 纯白卡片 */
  --bg-glass: rgba(255, 255, 255, 0.75);
  --text-main: #0f172a;        /* 深石板灰-主要文字 */
  --text-muted: #475569;       /* 石板灰-次要文字 */
  --text-light: #64748b;       /* 辅助文字 */
  --border-color: #e2e8f0;     /* 边框灰 */
  --border-glass: rgba(255, 255, 255, 0.6);
  --shadow-sm: 0 2px 8px -1px rgba(15, 23, 42, 0.03), 0 1px 3px -1px rgba(15, 23, 42, 0.02);
  --shadow-md: 0 12px 20px -8px rgba(15, 23, 42, 0.06), 0 4px 12px -2px rgba(15, 23, 42, 0.03);
  --shadow-lg: 0 20px 32px -12px rgba(15, 23, 42, 0.08), 0 8px 16px -4px rgba(15, 23, 42, 0.04);
  --shadow-glow: 0 0 24px var(--primary-glow);

  /* 动画 */
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
}

/* 重置与基础设置 */
*, *::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, "Helvetica Neue", Arial, sans-serif;
  background-color: var(--bg-base);
  color: var(--text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  position: relative;
  overflow-x: hidden;
  
  /* 极简网格背景与科技微光点缀 */
  background-image: 
    radial-gradient(circle at 80% 10%, rgba(37, 99, 235, 0.04) 0%, transparent 45%),
    radial-gradient(circle at 10% 80%, rgba(13, 148, 136, 0.03) 0%, transparent 45%),
    linear-gradient(rgba(226, 232, 240, 0.25) 1px, transparent 1px),
    linear-gradient(90deg, rgba(226, 232, 240, 0.25) 1px, transparent 1px);
  background-size: 100% 100%, 100% 100%, 48px 48px, 48px 48px;
}

/* 统一布局容器 */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* 导航栏样式 (Glassmorphism Header) */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 80px;
  background: var(--bg-glass);
  backdrop-filter: blur(12px) saturate(180%);
  border-bottom: 1px solid var(--border-glass);
  z-index: 1000;
  display: flex;
  align-items: center;
  transition: var(--transition-normal);
}

.header.scrolled {
  height: 65px;
  background: rgba(255, 255, 255, 0.9);
  box-shadow: var(--shadow-sm);
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo-wrapper {
  display: flex;
  align-items: center;
  text-decoration: none;
  font-family: 'Outfit', sans-serif;
  font-weight: 800;
  font-size: 1.6rem;
  letter-spacing: -0.5px;
}

.logo-wrapper span {
  background: var(--gradient-tech);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-list {
  display: flex;
  list-style: none;
  gap: 2.2rem;
  align-items: center;
}

.nav-link {
  text-decoration: none;
  color: var(--text-main);
  font-weight: 500;
  font-size: 0.95rem;
  transition: var(--transition-fast);
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-tech);
  transition: var(--transition-fast);
}

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

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

.btn-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.6rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition-normal);
  border: none;
}

.btn-cta-primary {
  background: var(--gradient-tech);
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
}

.btn-cta-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.35);
}

.btn-cta-secondary {
  background: #ffffff;
  color: var(--primary);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

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

/* 移动端菜单切换按钮 */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  flex-direction: column;
  gap: 6px;
}

.menu-toggle span {
  display: block;
  width: 25px;
  height: 2px;
  background-color: var(--text-main);
  transition: var(--transition-normal);
}

/* 首屏介绍 Section (Hero) */
.hero {
  padding: 180px 0 100px;
  position: relative;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 3.5rem;
  align-items: center;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  background: var(--primary-glow);
  color: var(--primary);
  font-weight: 600;
  font-size: 0.85rem;
  border-radius: 50px;
  border: 1px solid rgba(37, 99, 235, 0.1);
  margin-bottom: 1.5rem;
}

.hero-title {
  font-family: 'Outfit', sans-serif;
  font-weight: 800;
  font-size: 3.5rem;
  line-height: 1.15;
  margin-bottom: 1.5rem;
  letter-spacing: -1px;
}

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

.hero-desc {
  font-size: 1.15rem;
  color: var(--text-muted);
  margin-bottom: 2.5rem;
  line-height: 1.8;
}

.hero-btns {
  display: flex;
  gap: 1.2rem;
  margin-bottom: 3rem;
}

.hero-features {
  display: flex;
  gap: 2rem;
  align-items: center;
  border-top: 1px solid var(--border-color);
  padding-top: 2rem;
}

.hero-feature-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 500;
  color: var(--text-main);
  font-size: 0.9rem;
}

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

/* 动效图形容器 */
.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.tech-globe {
  width: 100%;
  max-width: 420px;
  height: 420px;
  background: var(--bg-card);
  border-radius: 50%;
  border: 1px solid var(--border-color);
  position: relative;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  background-image: 
    radial-gradient(circle at center, rgba(37, 99, 235, 0.03) 0%, transparent 70%),
    linear-gradient(rgba(37, 99, 235, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(37, 99, 235, 0.05) 1px, transparent 1px);
  background-size: 100% 100%, 30px 30px, 30px 30px;
  animation: float 6s ease-in-out infinite;
}

.tech-node {
  position: absolute;
  padding: 10px 14px;
  background: var(--bg-glass);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-md);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  font-size: 0.8rem;
  animation: nodeFloat 4s ease-in-out infinite;
}

.node-1 { top: 15%; left: 5%; animation-delay: 0s; }
.node-2 { bottom: 25%; right: -5%; animation-delay: 1.5s; }
.node-3 { top: 50%; right: 10%; animation-delay: 3s; }
.node-4 { bottom: 10%; left: 15%; animation-delay: 0.8s; }

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: #22c55e;
  box-shadow: 0 0 8px #22c55e;
}

/* 核心优势 (Core Advantages) */
.section {
  padding: 100px 0;
}

.section-bg {
  background: var(--bg-card);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 650px;
  margin: 0 auto 4.5rem;
}

.section-tag {
  color: var(--primary);
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  margin-bottom: 0.75rem;
  display: block;
}

.section-title {
  font-family: 'Outfit', sans-serif;
  font-weight: 800;
  font-size: 2.25rem;
  margin-bottom: 1rem;
}

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

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.card-adv {
  background: var(--bg-card);
  padding: 3rem 2rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  transition: var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.card-adv:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  border-color: rgba(37, 99, 235, 0.3);
}

.card-adv::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-tech);
  opacity: 0;
  transition: var(--transition-normal);
}

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

.adv-icon {
  width: 54px;
  height: 54px;
  border-radius: var(--radius-sm);
  background: var(--primary-glow);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.8rem;
}

.adv-icon svg {
  width: 26px;
  height: 26px;
}

.card-adv h3 {
  font-size: 1.3rem;
  margin-bottom: 1rem;
  font-weight: 700;
}

.card-adv p {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* 套餐与价格样式 (Pricing Table) */
.pricing-section {
  position: relative;
  padding: 100px 0;
}

.pricing-table-container {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  margin-top: 2rem;
}

.pricing-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.pricing-table th, 
.pricing-table td {
  padding: 1.5rem 2rem;
  border-bottom: 1px solid var(--border-color);
}

.pricing-table th {
  background: var(--bg-base);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text-main);
  font-family: 'Outfit', sans-serif;
}

.pricing-table tr:last-child td {
  border-bottom: none;
}

.pricing-table tbody tr {
  transition: var(--transition-fast);
}

.pricing-table tbody tr:hover {
  background: rgba(37, 99, 235, 0.02);
}

.pricing-table .plan-name {
  font-weight: 700;
  color: var(--primary);
  font-size: 1.15rem;
  display: flex;
  align-items: center;
  gap: 8px;
}

.pricing-table .popular-tag {
  background: var(--accent);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 4px;
}

.pricing-table .price-val {
  font-weight: 700;
  color: var(--text-main);
  font-size: 1.1rem;
  font-family: 'Outfit', sans-serif;
}

.pricing-table .price-val span {
  font-size: 0.8rem;
  font-weight: 400;
  color: var(--text-light);
}

.pricing-table .btn-buy {
  padding: 0.5rem 1.2rem;
  font-size: 0.85rem;
  border-radius: 6px;
  background: var(--primary);
  color: white;
  text-decoration: none;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: var(--transition-fast);
}

.pricing-table .btn-buy:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
}

/* 适合人群 (Target Audience Card Layout) */
.card-audience {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 2.5rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
  transition: var(--transition-normal);
}

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

.card-audience .audi-tag {
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--accent);
  text-transform: uppercase;
}

.card-audience h3 {
  font-size: 1.25rem;
  font-weight: 700;
}

.card-audience p {
  color: var(--text-muted);
  font-size: 0.95rem;
}

.card-audience ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: auto;
}

.card-audience li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-main);
}

.card-audience li svg {
  color: #22c55e;
}

/* 客户端安装与极简步骤教程 */
.tutorial-preview-section {
  background: var(--gradient-glow);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.steps-flow {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  margin-top: 3rem;
  position: relative;
}

.step-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  position: relative;
  text-align: center;
}

.step-number {
  width: 36px;
  height: 36px;
  background: var(--gradient-tech);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1rem;
  position: absolute;
  top: -18px;
  left: 50%;
  transform: translateX(-50%);
  box-shadow: 0 4px 8px rgba(37, 99, 235, 0.2);
}

.step-card h4 {
  font-size: 1.15rem;
  margin: 1rem 0 0.75rem;
  font-weight: 700;
}

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

/* 用户评价样式 (Testimonials) */
.testimonial-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.card-review {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 2.5rem 2rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
}

.review-content {
  font-style: italic;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  position: relative;
}

.review-content::before {
  content: '“';
  font-family: 'Outfit', sans-serif;
  font-size: 4rem;
  color: rgba(37, 99, 235, 0.08);
  position: absolute;
  top: -30px;
  left: -10px;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 12px;
}

.author-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--gradient-tech);
  color: white;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-family: 'Outfit', sans-serif;
}

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

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

/* FAQ Accordion (手风琴) */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

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

.faq-question {
  width: 100%;
  padding: 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--text-main);
  transition: var(--transition-fast);
}

.faq-question:hover {
  background: rgba(37, 99, 235, 0.02);
  color: var(--primary);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-normal) ease-out, padding var(--transition-normal) ease-out;
  padding: 0 1.5rem;
  background: #fafafa;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  max-height: 250px;
  padding: 1rem 1.5rem 1.5rem;
  border-top: 1px solid var(--border-color);
}

.faq-icon {
  width: 20px;
  height: 20px;
  transition: var(--transition-normal);
  color: var(--text-light);
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
  color: var(--primary);
}

/* 文章目录/最新文章 Block */
.articles-section {
  background: var(--bg-base);
}

.blog-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.card-blog {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: var(--transition-normal);
}

.card-blog:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(37, 99, 235, 0.2);
}

.blog-meta {
  padding: 1.5rem 1.5rem 0.5rem;
  font-size: 0.8rem;
  color: var(--text-light);
  display: flex;
  gap: 12px;
}

.blog-content {
  padding: 0 1.5rem 1.5rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.blog-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  line-height: 1.4;
  color: var(--text-main);
  text-decoration: none;
  transition: var(--transition-fast);
}

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

.blog-summary {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.blog-more {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--primary);
  text-decoration: none;
  transition: var(--transition-fast);
}

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

/* 博客详情页 / 文章排版样式 */
.article-container {
  padding: 160px 0 100px;
  max-width: 820px;
  margin: 0 auto;
}

.article-header {
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 2rem;
  margin-bottom: 2.5rem;
}

.article-breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-light);
  margin-bottom: 1.5rem;
}

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

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

.article-title-main {
  font-family: 'Outfit', sans-serif;
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 1.5rem;
}

.article-info-meta {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.rich-content {
  font-size: 1.05rem;
  color: var(--text-main);
  line-height: 1.8;
}

.rich-content p {
  margin-bottom: 1.6rem;
}

.rich-content h2 {
  font-size: 1.7rem;
  font-weight: 700;
  margin: 2.5rem 0 1.2rem;
  color: var(--text-main);
  border-left: 4px solid var(--primary);
  padding-left: 12px;
}

.rich-content h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin: 1.8rem 0 1rem;
}

.rich-content ul, 
.rich-content ol {
  margin-bottom: 1.6rem;
  padding-left: 1.8rem;
}

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

.rich-content blockquote {
  border-left: 4px solid var(--accent);
  background: var(--bg-base);
  padding: 1.2rem 1.6rem;
  font-style: italic;
  color: var(--text-muted);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 1.8rem 0;
}

.rich-content strong {
  font-weight: 700;
  color: var(--text-main);
}

/* SEO文章相关阅读卡片 */
.article-recommendations {
  border-top: 1px solid var(--border-color);
  padding-top: 3rem;
  margin-top: 4rem;
}

.article-recommendations h3 {
  font-size: 1.4rem;
  margin-bottom: 1.8rem;
}

/* 页脚 (Footer) */
.footer {
  background: #0b0f19;
  color: #94a3b8;
  padding: 80px 0 30px;
  border-top: 1px solid #1e293b;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr 0.8fr 1.2fr;
  gap: 3.5rem;
  margin-bottom: 50px;
}

.footer-brand h2 {
  font-family: 'Outfit', sans-serif;
  font-weight: 800;
  font-size: 1.6rem;
  color: #fff;
  margin-bottom: 1rem;
}

.footer-brand h2 span {
  background: var(--gradient-tech);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.footer-brand p {
  font-size: 0.9rem;
  line-height: 1.7;
}

.footer-title {
  color: #fff;
  font-weight: 600;
  font-size: 1rem;
  margin-bottom: 1.2rem;
}

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

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

.footer-links a:hover {
  color: #fff;
  padding-left: 4px;
}

.footer-bottom {
  border-top: 1px solid #1e293b;
  padding-top: 30px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
}

.footer-legal-links {
  display: flex;
  gap: 20px;
}

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

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

/* 动效 Keyframes */
@keyframes float {
  0% { transform: translateY(0px); }
  50% { transform: translateY(-12px); }
  100% { transform: translateY(0px); }
}

@keyframes nodeFloat {
  0% { transform: translateY(0px); }
  50% { transform: translateY(-6px); }
  100% { transform: translateY(0px); }
}

/* 响应式媒体查询 (Responsive Design) */
@media (max-width: 1024px) {
  .hero-title { font-size: 2.8rem; }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .steps-flow { grid-template-columns: repeat(2, 1fr); gap: 2.5rem; }
  .testimonial-grid { grid-template-columns: repeat(2, 1fr); }
  .blog-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); gap: 2rem; }
}

@media (max-width: 768px) {
  .menu-toggle { display: flex; }
  .nav-list {
    position: fixed;
    top: 80px;
    left: 0;
    right: 0;
    background: #ffffff;
    border-bottom: 1px solid var(--border-color);
    flex-direction: column;
    padding: 2rem;
    gap: 1.5rem;
    transform: translateY(-150%);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-normal);
    box-shadow: var(--shadow-md);
  }
  .nav-list.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  .hero-grid { grid-template-columns: 1fr; text-align: center; gap: 2rem; }
  .hero-btns { justify-content: center; }
  .hero-features { justify-content: center; flex-wrap: wrap; }
  .grid-3 { grid-template-columns: 1fr; }
  .grid-4 { grid-template-columns: 1fr; }
  .steps-flow { grid-template-columns: 1fr; }
  .testimonial-grid { grid-template-columns: 1fr; }
  .blog-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: 15px; text-align: center; }
  .pricing-table-container { overflow-x: auto; }
}