:root {
  --primary: #4f46e5;
  --primary-dark: #3730a3;
  --accent: #f59e0b;
  --dark: #0f172a;
  --gray: #64748b;
  --light: #f8fafc;
  --white: #ffffff;
  --border: #e2e8f0;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--dark);
  line-height: 1.75;
  background: var(--white);
}

a {
  text-decoration: none;
  color: inherit;
}

.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

/* 导航 */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 66px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.5px;
}

.logo-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), #7c3aed);
  color: #fff;
  font-size: 17px;
}

.nav-links {
  display: flex;
  gap: 30px;
}

.nav-links a {
  color: var(--gray);
  font-size: 15px;
  font-weight: 500;
  transition: color 0.2s;
}

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

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  padding: 9px;
  background: transparent;
  border: 0;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--dark);
  border-radius: 2px;
  transition: transform 0.2s, opacity 0.2s;
}

/* Hero */
.hero {
  position: relative;
  padding: 110px 0 90px;
  overflow: hidden;
  background:
    radial-gradient(ellipse at 20% 10%, rgba(79, 70, 229, 0.18), transparent 55%),
    radial-gradient(ellipse at 80% 0%, rgba(124, 58, 237, 0.16), transparent 50%),
    linear-gradient(180deg, #f6f7ff 0%, #ffffff 100%);
}

.hero .container {
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 999px;
  background: rgba(79, 70, 229, 0.08);
  color: var(--primary);
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 22px;
}

.hero h1 {
  font-size: 52px;
  line-height: 1.2;
  letter-spacing: -1px;
  margin-bottom: 20px;
}

.hero h1 .highlight {
  background: linear-gradient(90deg, var(--primary), #7c3aed);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero p {
  max-width: 660px;
  color: var(--gray);
  font-size: 18px;
  margin-bottom: 34px;
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 24px;
  border-radius: 12px;
  font-size: 16px;
  font-weight: 600;
  transition: all 0.2s;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 8px 20px rgba(79, 70, 229, 0.25);
}

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
}

.btn-ghost {
  border: 1px solid var(--border);
  color: var(--dark);
  background: #fff;
}

.btn-ghost:hover {
  border-color: var(--primary);
  color: var(--primary);
}

/* 通用区块 */
.section {
  padding: 84px 0;
}

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

.section-head {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 52px;
}

.section-head .eyebrow {
  color: var(--primary);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 2px;
  text-transform: uppercase;
}

.section-head h2 {
  font-size: 34px;
  margin: 10px 0 14px;
}

.section-head p {
  color: var(--gray);
}

/* 卡片 */
.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px;
  transition: all 0.25s;
}

.card:hover {
  border-color: rgba(79, 70, 229, 0.4);
  box-shadow: 0 16px 34px rgba(15, 23, 42, 0.08);
  transform: translateY(-4px);
}

.card-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  border-radius: 12px;
  background: rgba(79, 70, 229, 0.1);
  font-size: 22px;
  margin-bottom: 16px;
}

.card h3 {
  font-size: 19px;
  margin-bottom: 10px;
}

.card p {
  color: var(--gray);
  font-size: 15px;
}

/* 优势数字 */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  text-align: center;
  margin-top: 54px;
}

.stat-value {
  font-size: 36px;
  font-weight: 700;
  color: var(--primary);
}

.stat-label {
  color: var(--gray);
  margin-top: 4px;
}

/* 页面头部（子页） */
.page-hero {
  padding: 72px 0 54px;
  background: linear-gradient(180deg, #f6f7ff 0%, #ffffff 100%);
  text-align: center;
}

.page-hero h1 {
  font-size: 38px;
  margin-bottom: 12px;
}

.page-hero p {
  color: var(--gray);
  max-width: 620px;
  margin: 0 auto;
}

/* 关于 */
.about-list {
  list-style: none;
}

.about-list li {
  position: relative;
  padding-left: 28px;
  margin-bottom: 14px;
  color: var(--gray);
}

.about-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: 0;
  color: var(--primary);
  font-weight: 700;
}

/* 联系 */
.contact-info {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.contact-item {
  display: flex;
  gap: 14px;
  align-items: flex-start;
}

.contact-item .card-icon {
  margin-bottom: 0;
  flex-shrink: 0;
}

.contact-item h4 {
  font-size: 16px;
  margin-bottom: 4px;
}

.contact-item p {
  color: var(--gray);
}

/* 页脚 */
.footer {
  background: var(--dark);
  color: #cbd5e1;
  padding: 54px 0 30px;
}

.footer-top {
  display: flex;
  justify-content: space-between;
  gap: 30px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.footer h3 {
  color: #fff;
  font-size: 17px;
  margin-bottom: 14px;
}

.footer a {
  color: #cbd5e1;
}

.footer a:hover {
  color: #fff;
}

.footer-links {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 22px;
  font-size: 14px;
  color: #94a3b8;
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: center;
  text-align: center;
}

.footer-bottom a {
  color: #94a3b8;
}

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

/* 响应式 */
@media (max-width: 860px) {
  .grid,
  .grid-2 {
    grid-template-columns: 1fr;
  }

  .stats {
    grid-template-columns: repeat(2, 1fr);
  }

  .hero h1 {
    font-size: 38px;
  }

  .nav-links {
    gap: 18px;
  }
}

@media (max-width: 720px) {
  .nav-inner {
    position: relative;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 66px;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: var(--white);
    border-top: 1px solid var(--border);
    box-shadow: 0 12px 24px rgba(15, 23, 42, 0.08);
    padding: 8px 0;
  }

  .nav-inner.open .nav-links {
    display: flex;
  }

  .nav-links a {
    padding: 12px 24px;
    font-size: 16px;
  }

  .nav-links a:hover,
  .nav-links a.active {
    background: rgba(79, 70, 229, 0.06);
  }
}