/* ===== 基础重置与自定义属性 ===== */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
  overflow-x: hidden;
  background: radial-gradient(ellipse at 20% 50%, #f9f5ff 0%, #f0fdf4 50%, #fff5f5 100%);
  min-height: 100vh;
  color: #1a1a2e;
  line-height: 1.6;
}

/* ===== 自定义变量 ===== */
:root {
  --color-primary: #4ecdc4;
  --color-primary-dark: #38b2ac;
  --color-secondary: #ff6b6b;
  --color-accent: #b8b5ff;
  --color-dark: #1a1a2e;
  --color-mid: #4a4a6a;
  --color-light: #ffffff;
  --color-glass: rgba(255, 255, 255, 0.6);
  --color-border: rgba(78, 205, 196, 0.25);
  --shadow-soft: 0 8px 32px rgba(78, 205, 196, 0.12);
  --shadow-hover: 0 12px 40px rgba(78, 205, 196, 0.20);
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --font-display: 'PingFang SC', sans-serif;
  --transition: 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* ===== 容器与通用布局 ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 100px 0;
  position: relative;
}

.section:nth-child(even) {
  background: transparent;
}

/* 给每个section增加微妙的装饰圆形 */
.section::before {
  content: '';
  position: absolute;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--color-accent) 0%, transparent 70%);
  opacity: 0.15;
  pointer-events: none;
  z-index: 0;
  top: 10%;
  left: -5%;
}

.section:nth-child(even)::before {
  right: -5%;
  left: auto;
  background: radial-gradient(circle, var(--color-primary) 0%, transparent 70%);
}

/* ===== 导航栏 ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.75);
  backdrop-filter: blur(20px) saturate(1.4);
  -webkit-backdrop-filter: blur(20px) saturate(1.4);
  border-bottom: 1px solid var(--color-border);
  box-shadow: 0 2px 20px rgba(78, 205, 196, 0.08);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.3rem;
  text-decoration: none;
  color: var(--color-dark);
  letter-spacing: -0.5px;
}

.logo-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: var(--color-light);
  font-weight: 700;
  box-shadow: 0 4px 12px rgba(78, 205, 196, 0.3);
}

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

.main-nav a {
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: var(--transition);
  color: var(--color-mid);
  position: relative;
  padding: 4px 0;
}

.main-nav a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  border-radius: 2px;
  transition: width 0.3s ease;
}

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

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

.nav-cta {
  padding: 10px 24px;
  border-radius: 50px;
  color: #fff !important;
  font-weight: 600;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  box-shadow: 0 4px 16px rgba(78, 205, 196, 0.3);
  transition: var(--transition);
}

.nav-cta:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 8px 24px rgba(78, 205, 196, 0.4);
  color: #fff !important;
}

.nav-cta::after {
  display: none !important;
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--color-dark);
  padding: 8px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.menu-toggle:hover {
  background: var(--color-glass);
}

/* ===== Hero 区域 ===== */
.hero {
  min-height: 85vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -20%;
  right: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(78, 205, 196, 0.12) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero-content {
  max-width: 720px;
  position: relative;
  z-index: 1;
}

.hero-eyebrow {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  padding: 6px 18px;
  border-radius: 50px;
  margin-bottom: 20px;
  text-transform: uppercase;
  letter-spacing: 2px;
  background: linear-gradient(135deg, var(--color-primary), #a7f3d0);
  color: var(--color-dark);
  box-shadow: 0 2px 10px rgba(78, 205, 196, 0.2);
}

.hero h1 {
  font-size: 3.2rem;
  line-height: 1.15;
  margin-bottom: 24px;
  font-weight: 900;
  background: linear-gradient(135deg, var(--color-dark), var(--color-primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.15rem;
  opacity: 0.7;
  max-width: 560px;
  margin-bottom: 36px;
  color: var(--color-mid);
  line-height: 1.7;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-image {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-soft);
  background: var(--color-light);
}

.hero-image img {
  width: 100%;
  height: auto;
  display: block;
}

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 32px;
  border-radius: 50px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  text-decoration: none;
  transition: var(--transition);
  font-size: 0.95rem;
}

.btn-primary {
  color: #fff;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  box-shadow: 0 4px 20px rgba(78, 205, 196, 0.35);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(78, 205, 196, 0.45);
}

.btn-outline {
  background: transparent;
  border: 2px solid var(--color-primary);
  color: var(--color-primary);
}

.btn-outline:hover {
  background: var(--color-primary);
  color: #fff;
  transform: translateY(-3px);
}

/* ===== 标签/标题 ===== */
.section-label {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 2px;
  margin-bottom: 14px;
  text-transform: uppercase;
  color: var(--color-primary);
  padding: 4px 12px;
  border-radius: 30px;
  background: rgba(78, 205, 196, 0.1);
}

.section-title {
  font-size: 2.2rem;
  margin-bottom: 16px;
  font-weight: 800;
  line-height: 1.2;
  color: var(--color-dark);
}

.section-desc {
  max-width: 600px;
  opacity: 0.7;
  margin-bottom: 48px;
  color: var(--color-mid);
  font-size: 1.05rem;
}

/* ===== 卡片网格 ===== */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 28px;
}

.category-card {
  border-radius: var(--radius-md);
  padding: 32px 28px;
  border: 1px solid var(--color-border);
  background: var(--color-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: var(--transition);
  box-shadow: var(--shadow-soft);
}

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

.card-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
  font-size: 1.5rem;
  background: linear-gradient(135deg, var(--color-accent), #c7d2fe);
  color: var(--color-dark);
  box-shadow: 0 2px 8px rgba(78, 205, 196, 0.15);
}

.card-link {
  font-weight: 600;
  font-size: 0.85rem;
  text-decoration: none;
  color: var(--color-primary);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: var(--transition);
}

.card-link:hover {
  gap: 8px;
  color: var(--color-primary-dark);
}

/* ===== 特性块 ===== */
.feature-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.feature-image {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-soft);
  background: var(--color-light);
}

.feature-image img {
  width: 100%;
  height: auto;
  display: block;
}

.feature-text {
  position: relative;
}

.feature-list {
  list-style: none;
  margin-top: 16px;
}

.feature-list li {
  padding: 8px 0;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1rem;
  color: var(--color-mid);
}

.feature-list li::before {
  content: '✦';
  font-weight: 700;
  color: var(--color-primary);
  font-size: 1.2rem;
}

/* ===== 数据条 ===== */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}

.stat-item {
  padding: 32px 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-glass);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: var(--transition);
}

.stat-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.stat-number {
  font-size: 2.6rem;
  font-weight: 900;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}

.stat-label {
  font-size: 0.9rem;
  opacity: 0.6;
  margin-top: 8px;
  color: var(--color-mid);
  font-weight: 500;
}

/* ===== 内容墙 ===== */
.content-wall {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 28px;
}

.content-wall-item {
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--color-border);
  background: var(--color-glass);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: var(--transition);
  box-shadow: var(--shadow-soft);
}

.content-wall-item:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
  border-color: var(--color-primary);
}

.content-wall-item img {
  width: 100%;
  height: 220px;
  object-fit: cover;
  transition: var(--transition);
}

.content-wall-item:hover img {
  transform: scale(1.03);
}

.content-wall-body {
  padding: 24px;
}

.content-wall-body h4 {
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--color-dark);
}

/* ===== FAQ ===== */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: 10px;
  overflow: hidden;
  cursor: pointer;
  background: var(--color-glass);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: var(--transition);
}

.faq-item:hover {
  box-shadow: var(--shadow-soft);
}

.faq-item .faq-question {
  padding: 18px 24px;
  font-weight: 600;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--color-dark);
  font-size: 1.05rem;
}

.faq-item .faq-question::after {
  content: '+';
  font-size: 1.4rem;
  font-weight: 300;
  transition: transform 0.3s ease;
  color: var(--color-primary);
}

.faq-item.open .faq-question::after {
  transform: rotate(45deg);
}

.faq-item .faq-answer {
  padding: 0 24px 20px;
  display: none;
  opacity: 0.8;
  color: var(--color-mid);
  line-height: 1.7;
}

.faq-item.open .faq-answer {
  display: block;
  animation: slideDown 0.3s ease;
}

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

/* ===== CTA 横幅 ===== */
.cta-banner {
  padding: 60px 32px;
  text-align: center;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: #fff;
  box-shadow: 0 12px 40px rgba(78, 205, 196, 0.3);
  position: relative;
  overflow: hidden;
}

.cta-banner::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -30%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(255,255,255,0.15) 0%, transparent 70%);
  border-radius: 50%;
}

.cta-banner h2 {
  color: #fff;
  font-size: 2rem;
  font-weight: 800;
  position: relative;
  z-index: 1;
}

.cta-banner .btn-primary {
  background: #fff;
  color: var(--color-primary);
  box-shadow: 0 4px 20px rgba(0,0,0,0.1);
  margin-top: 20px;
}

.cta-banner .btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(0,0,0,0.15);
}

/* ===== 页脚 ===== */
.site-footer {
  padding: 64px 0 32px;
  background: rgba(26, 26, 46, 0.03);
  backdrop-filter: blur(12px);
  border-top: 1px solid var(--color-border);
}

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

.footer-brand {
  color: var(--color-dark);
}

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

.footer-col h5 {
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--color-dark);
  font-size: 0.95rem;
}

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

.footer-col li {
  margin-bottom: 8px;
}

.footer-col a {
  text-decoration: none;
  color: var(--color-mid);
  font-size: 0.9rem;
  transition: var(--transition);
}

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

.footer-bottom {
  border-top: 1px solid rgba(78, 205, 196, 0.2);
  margin-top: 48px;
  padding-top: 24px;
  text-align: center;
  font-size: 0.85rem;
  color: var(--color-mid);
  opacity: 0.7;
}

/* ===== 工具类 ===== */
.text-accent {
  color: var(--color-primary);
}

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

.seo-description {
  max-width: 600px;
  margin: 0 auto 48px;
  opacity: 0.7;
  color: var(--color-mid);
}

.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .hero h1 {
    font-size: 2.6rem;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .feature-block {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .stats-bar {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
  .main-nav {
    display: none;
  }
  .menu-toggle {
    display: flex;
  }
  .main-nav.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 72px;
    left: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    padding: 24px 20px;
    box-shadow: 0 8px 30px rgba(0,0,0,0.1);
    gap: 16px;
  }
  .hero {
    min-height: 70vh;
    padding-top: 80px;
  }
  .hero h1 {
    font-size: 2.2rem;
  }
  .section-title {
    font-size: 1.8rem;
  }
  .cta-banner {
    padding: 40px 20px;
  }
  .cta-banner h2 {
    font-size: 1.5rem;
  }
}

@media (max-width: 480px) {
  .cards-grid,
  .content-wall,
  .stats-bar {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .hero-buttons {
    flex-direction: column;
    align-items: stretch;
  }
  .hero h1 {
    font-size: 1.8rem;
  }
  .hero p {
    font-size: 1rem;
  }
  .stat-number {
    font-size: 2rem;
  }
  .menu-toggle {
    display: flex;
  }
}

/* 额外动画装饰 — 背景浮动元素 (纯CSS) */
body::before,
body::after {
  content: '';
  position: fixed;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(78, 205, 196, 0.06) 0%, transparent 70%);
  pointer-events: none;
  z-index: -1;
  animation: floatBlob 20s infinite alternate ease-in-out;
}

body::before {
  top: 10%;
  left: -10%;
  background: radial-gradient(circle, rgba(184, 181, 255, 0.08) 0%, transparent 70%);
  animation-duration: 25s;
}

body::after {
  bottom: 10%;
  right: -10%;
  background: radial-gradient(circle, rgba(255, 107, 107, 0.05) 0%, transparent 70%);
  animation-duration: 30s;
  animation-delay: -5s;
}

@keyframes floatBlob {
  0% { transform: translate(0, 0) scale(1); }
  100% { transform: translate(100px, -80px) scale(1.2); }
}