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

:root {
  --color-bg: #f7f9fc;
  --color-surface: #ffffff;
  --color-primary: #1a5276;
  --color-primary-light: #2980b9;
  --color-accent: #f5b041;
  --color-accent-dark: #d68910;
  --color-text: #2c3e50;
  --color-text-light: #7f8c8d;
  --color-border: #d5dbdb;
  --color-overlay: rgba(26, 82, 118, 0.08);
  --font-sans: 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.12);
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-text);
  overflow-x: hidden;
  line-height: 1.6;
}

/* 容器与区块 */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 80px 0;
}

.section:nth-child(even) {
  background: #edf2f7;
}

/* 导航栏 — 固定顶部，半透明 */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(247, 249, 252, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.04);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.25rem;
  text-decoration: none;
  color: var(--color-primary);
  letter-spacing: -0.02em;
}

.logo-icon {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-dark));
  color: #fff;
  box-shadow: 0 2px 8px rgba(245, 176, 65, 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;
  color: var(--color-text);
  transition: var(--transition);
  position: relative;
  padding-bottom: 2px;
}

.main-nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: var(--transition);
}

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

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

.nav-cta {
  padding: 8px 22px;
  border-radius: var(--radius-sm);
  color: #fff !important;
  font-weight: 600;
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-dark));
  box-shadow: 0 2px 12px rgba(245, 176, 65, 0.35);
  transition: var(--transition);
}

.nav-cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 20px rgba(245, 176, 65, 0.45);
}

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

.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--color-primary);
  padding: 4px;
  transition: var(--transition);
}

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

/* 首页 Hero */
.hero {
  min-height: 80vh;
  display: flex;
  align-items: center;
  position: relative;
  background: linear-gradient(160deg, #e8f0fe 0%, #f7f9fc 60%);
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -20%;
  right: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(245, 176, 65, 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: var(--radius-lg);
  margin-bottom: 20px;
  background: var(--color-accent);
  color: #fff;
  letter-spacing: 1px;
  text-transform: uppercase;
  box-shadow: 0 2px 10px rgba(245, 176, 65, 0.3);
}

.hero h1 {
  font-size: 3.2rem;
  line-height: 1.15;
  margin-bottom: 20px;
  font-weight: 800;
  color: var(--color-primary);
  letter-spacing: -0.02em;
}

.hero h1 span {
  color: var(--color-accent-dark);
}

.hero p {
  font-size: 1.1rem;
  opacity: 0.7;
  max-width: 560px;
  margin-bottom: 36px;
  line-height: 1.7;
  color: var(--color-text-light);
}

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

.hero-image {
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  max-width: 600px;
}

.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: var(--radius-sm);
  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-accent), var(--color-accent-dark));
  box-shadow: 0 4px 14px rgba(245, 176, 65, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(245, 176, 65, 0.45);
}

.btn-outline {
  background: transparent;
  border: 1.5px solid var(--color-primary);
  color: var(--color-primary);
}

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

/* 标签/标题 */
.section-label {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 2px;
  margin-bottom: 12px;
  color: var(--color-accent-dark);
  text-transform: uppercase;
}

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

.section-desc {
  max-width: 600px;
  opacity: 0.7;
  margin-bottom: 48px;
  color: var(--color-text-light);
  font-size: 1.05rem;
  line-height: 1.6;
}

/* 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;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
}

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

.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), var(--color-accent-dark));
  color: #fff;
  box-shadow: 0 4px 12px rgba(245, 176, 65, 0.25);
}

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

.card-link:hover {
  color: var(--color-accent-dark);
}

/* 特性块 */
.feature-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}

.feature-image {
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

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

.feature-text {
  padding: 8px 0;
}

.feature-list {
  list-style: none;
  margin-top: 24px;
}

.feature-list li {
  padding: 8px 0;
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1rem;
  color: var(--color-text);
}

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

/* 数据条 */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
  text-align: center;
}

.stat-item {
  padding: 28px 12px;
  border-radius: var(--radius-md);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.stat-item:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.stat-number {
  font-size: 2.6rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1.1;
}

.stat-label {
  font-size: 0.9rem;
  opacity: 0.6;
  margin-top: 6px;
  color: var(--color-text-light);
}

/* 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;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
}

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

.content-wall-item img {
  width: 100%;
  height: 220px;
  object-fit: cover;
  display: block;
}

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

.content-wall-body h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--color-primary);
}

.content-wall-body p {
  font-size: 0.9rem;
  color: var(--color-text-light);
  line-height: 1.5;
}

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

.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  margin-bottom: 10px;
  overflow: hidden;
  cursor: pointer;
  background: var(--color-surface);
  transition: var(--transition);
}

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

.faq-item .faq-question {
  padding: 18px 24px;
  font-weight: 600;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--color-primary);
  font-size: 1rem;
}

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

.faq-item.open .faq-question::after {
  content: '−';
}

.faq-item .faq-answer {
  padding: 0 24px 18px;
  display: none;
  opacity: 0.8;
  color: var(--color-text);
  line-height: 1.7;
}

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

/* CTA 横幅 */
.cta-banner {
  padding: 64px 24px;
  text-align: center;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--color-primary), #1a3d5c);
  color: #fff;
  position: relative;
  overflow: hidden;
}

.cta-banner::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(245, 176, 65, 0.15) 0%, transparent 70%);
  pointer-events: none;
}

.cta-banner h2 {
  color: #fff;
  font-size: 2rem;
  margin-bottom: 16px;
}

.cta-banner p {
  color: rgba(255, 255, 255, 0.8);
  max-width: 560px;
  margin: 0 auto 28px;
  font-size: 1.05rem;
}

.cta-banner .btn-primary {
  background: #fff;
  color: var(--color-primary);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
}

.cta-banner .btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.2);
}

/* 页脚 */
.site-footer {
  padding: 64px 0 28px;
  background: var(--color-primary);
  color: rgba(255, 255, 255, 0.85);
}

.site-footer .container {
  position: relative;
}

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

.footer-brand {
  max-width: 300px;
}

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

.footer-brand p {
  font-size: 0.9rem;
  opacity: 0.75;
  line-height: 1.6;
}

.footer-col h4 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--color-accent);
}

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

.footer-col ul li {
  padding: 4px 0;
}

.footer-col ul li a {
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  font-size: 0.9rem;
  transition: var(--transition);
}

.footer-col ul li a:hover {
  color: var(--color-accent);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  margin-top: 48px;
  padding-top: 24px;
  text-align: center;
  font-size: 0.85rem;
  opacity: 0.7;
}

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

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

.seo-description {
  max-width: 600px;
  margin: 0 auto 48px;
  opacity: 0.7;
  color: var(--color-text-light);
  font-size: 1rem;
  line-height: 1.7;
}

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

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

/* 响应式 */
@media (max-width: 992px) {
  .feature-block {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .feature-image {
    max-width: 600px;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
  .hero h1 {
    font-size: 2.6rem;
  }
}

@media (max-width: 768px) {
  .stats-bar {
    grid-template-columns: repeat(2, 1fr);
  }
  .main-nav {
    display: none;
  }
  .menu-toggle {
    display: flex;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--color-primary);
    padding: 4px;
  }
  .main-nav.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 68px;
    left: 0;
    width: 100%;
    background: var(--color-surface);
    padding: 24px;
    box-shadow: var(--shadow-md);
    gap: 16px;
    border-top: 1px solid var(--color-border);
  }
  .main-nav.open a {
    padding: 8px 0;
    border-bottom: 1px solid var(--color-border);
  }
  .main-nav.open a:last-child {
    border-bottom: none;
  }
  .nav-cta {
    align-self: flex-start;
  }
  .hero {
    min-height: 60vh;
    padding: 100px 0 60px;
  }
  .hero h1 {
    font-size: 2rem;
  }
  .section-title {
    font-size: 1.8rem;
  }
  .cta-banner {
    padding: 48px 20px;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }
}

@media (max-width: 480px) {
  .cards-grid,
  .content-wall,
  .stats-bar {
    grid-template-columns: 1fr;
  }
  .hero-buttons {
    flex-direction: column;
  }
  .hero-buttons .btn {
    width: 100%;
    justify-content: center;
  }
  .section {
    padding: 60px 0;
  }
  .hero h1 {
    font-size: 1.8rem;
  }
  .stat-number {
    font-size: 2rem;
  }
}