:root {
  --bg: #f6f8fc;
  --surface: #ffffff;
  --text: #1a2233;
  --muted: #5c6783;
  --primary: #2d63ff;
  --primary-dark: #1f4de0;
  --primary-light: #5c8aff;
  --border: #dfe5f2;
  --shadow: 0 12px 30px rgba(20, 37, 78, 0.08);
  --shadow-hover: 0 16px 40px rgba(20, 37, 78, 0.12);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
}

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

.container {
  width: min(1100px, 92%);
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.95);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(6px);
}

.nav-wrap {
  min-height: 70px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: 1.15rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  transition: var(--transition);
}

.logo:hover {
  opacity: 0.9;
}

.nav-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  gap: 1.2rem;
}

.nav-list a {
  color: var(--muted);
  font-weight: 500;
}

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

.hero {
  padding: 88px 0 72px;
  background: linear-gradient(180deg, #eef3ff 0%, #f8faff 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at 20% 30%, rgba(45, 99, 255, 0.05) 0%, transparent 50%),
              radial-gradient(circle at 80% 70%, rgba(92, 138, 255, 0.05) 0%, transparent 50%);
  pointer-events: none;
}

.hero-content {
  max-width: 760px;
}

.kicker {
  display: inline-block;
  margin: 0 0 0.9rem;
  padding: 0.3rem 0.7rem;
  border-radius: 999px;
  background: #e4ebff;
  color: #1f4de0;
  font-size: 0.85rem;
  font-weight: 600;
  animation: fadeInUp 0.6s ease-out;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

h1,
h2,
h3 {
  margin-top: 0;
  line-height: 1.25;
}

h1 {
  margin-bottom: 1rem;
  font-size: clamp(2rem, 5vw, 3rem);
  animation: fadeInUp 0.6s ease-out 0.2s both;
}

.lead {
  color: var(--muted);
  font-size: 1.06rem;
  margin-bottom: 1.6rem;
  animation: fadeInUp 0.6s ease-out 0.4s both;
}

.btn-primary {
  display: inline-block;
  padding: 0.75rem 1.2rem;
  border-radius: 0.65rem;
  background: var(--primary);
  color: #fff;
  font-weight: 600;
  transition: var(--transition);
  box-shadow: 0 4px 12px rgba(45, 99, 255, 0.2);
}

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(45, 99, 255, 0.3);
}

.section {
  padding: 72px 0;
}

.section-alt {
  background: #f0f4ff;
}

.feature-list {
  margin: 1rem 0 0;
  padding-left: 1.1rem;
  color: var(--muted);
}

.feature-list li + li {
  margin-top: 0.4rem;
}

.card-grid {
  margin-top: 1.25rem;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 0.85rem;
  padding: 1.05rem;
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: var(--primary-light);
}

.card p,
.step p,
.section p {
  color: var(--muted);
  margin: 0;
}

.card h3,
.step h3 {
  margin-bottom: 0.6rem;
  color: var(--text);
}

.step-grid {
  margin-top: 1.25rem;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.step {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 0.85rem;
  padding: 1.1rem;
  transition: var(--transition);
}

.step:hover {
  border-color: var(--primary-light);
  box-shadow: var(--shadow-hover);
}

.step span {
  display: inline-block;
  margin-bottom: 0.55rem;
  font-weight: 700;
  color: var(--primary);
}

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

.contact-box .btn-primary {
  margin-top: 0.5rem;
  animation: fadeInUp 0.6s ease-out 0.6s both;
}

.site-footer {
  border-top: 1px solid var(--border);
  background: #fff;
  margin-top: 72px;
}

.footer-wrap {
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
  flex-wrap: wrap;
}

.site-footer p {
  margin: 0;
  color: var(--muted);
}

.footer-links {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.footer-links span {
  color: var(--muted);
  opacity: 0.6;
}

.footer-links a {
  color: var(--primary);
  font-weight: 600;
  transition: var(--transition);
}

.footer-links a:hover {
  color: var(--primary-dark);
  text-decoration: underline;
}

@media (max-width: 820px) {
  .hero {
    padding-top: 72px;
  }

  .card-grid,
  .step-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .nav-wrap {
    min-height: 62px;
    flex-direction: column;
    justify-content: center;
    gap: 0.7rem;
    padding: 0.75rem 0;
  }

  .nav-list {
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.9rem;
  }

  .section {
    padding: 56px 0;
  }

  .footer-wrap {
    padding: 0.75rem 0;
  }
}