:root {
  --bg: #f4f8ff;
  --surface: #ffffff;
  --text: #0f1d40;
  --muted: #4f638f;
  --primary: #0d6efd;
  --primary-strong: #0555d9;
  --line: #d6e3ff;
  --shadow: 0 14px 30px rgba(4, 43, 113, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "PingFang SC", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 10% -10%, #c8ddff 0%, rgba(200, 221, 255, 0) 45%),
    linear-gradient(180deg, #eef5ff 0%, #ffffff 45%, #f7faff 100%);
  line-height: 1.6;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

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

.container {
  width: min(1120px, 92vw);
  margin: 0 auto;
}

.skip-link {
  position: absolute;
  left: -9999px;
}

.skip-link:focus {
  left: 16px;
  top: 16px;
  z-index: 1000;
  background: var(--primary);
  color: #fff;
  padding: 8px 12px;
  border-radius: 8px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}

.nav-wrap {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.03rem;
}

.main-nav {
  display: inline-flex;
  align-items: center;
  gap: 18px;
}

.main-nav a {
  color: var(--muted);
  font-weight: 600;
}

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

.menu-btn {
  display: none;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--text);
  border-radius: 10px;
  padding: 8px 12px;
  font-weight: 600;
}

.hero {
  padding: 58px 0 40px;
}

.hero-grid {
  display: grid;
  align-items: center;
  gap: 34px;
  grid-template-columns: 1.1fr 1fr;
}

.eyebrow {
  display: inline-block;
  font-size: 0.86rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--primary-strong);
  font-weight: 700;
  background: #dce9ff;
  padding: 4px 10px;
  border-radius: 999px;
}

h1,
h2,
h3 {
  margin: 0 0 12px;
  line-height: 1.25;
}

h1 {
  font-size: clamp(1.9rem, 4vw, 2.8rem);
}

h2 {
  font-size: clamp(1.45rem, 2.5vw, 2rem);
}

.hero-copy p {
  margin-top: 0;
  color: #2f4679;
}

.hero-actions {
  display: flex;
  gap: 12px;
  margin: 24px 0;
}

.btn {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  border-radius: 10px;
  padding: 11px 18px;
  font-weight: 700;
  border: 1px solid transparent;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, #2a86ff 100%);
  color: #fff;
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background: linear-gradient(135deg, var(--primary-strong) 0%, #1e73e3 100%);
}

.btn-light {
  border-color: var(--line);
  background: #fff;
  color: var(--primary-strong);
}

.hero-metrics {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.hero-metrics li {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 10px;
}

.hero-metrics strong {
  display: block;
  font-size: 1.25rem;
  color: var(--primary-strong);
}

.hero-metrics span {
  color: #446099;
  font-size: 0.9rem;
}

.hero-media img {
  border-radius: 16px;
  box-shadow: var(--shadow);
  border: 1px solid #d9e7ff;
}

.features,
.highlights,
.faq,
.cta {
  padding: 54px 0;
}

.section-lead {
  margin-top: 0;
  color: var(--muted);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.feature-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 18px;
  box-shadow: 0 8px 20px rgba(7, 43, 105, 0.06);
}

.feature-card p {
  margin: 0;
  color: #45608f;
}

.highlights .timeline {
  display: grid;
  gap: 12px;
}

.timeline article {
  background: linear-gradient(180deg, #ffffff 0%, #f5f9ff 100%);
  border: 1px solid var(--line);
  border-left: 5px solid var(--primary);
  border-radius: 12px;
  padding: 16px;
}

.timeline p {
  margin: 0;
  color: #3c5586;
}

.faq details {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 12px 14px;
}

.faq details + details {
  margin-top: 10px;
}

.faq summary {
  font-weight: 700;
  cursor: pointer;
}

.faq p {
  margin: 8px 0 0;
  color: #48618e;
}

.cta-box {
  background: linear-gradient(145deg, #ecf4ff 0%, #ffffff 80%);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 26px;
  text-align: center;
}

.cta-box p {
  color: #44639a;
}

.site-footer {
  border-top: 1px solid var(--line);
  background: #f6faff;
}

.footer-wrap {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-size: 0.92rem;
  color: #4e6390;
}

.footer-wrap a {
  color: var(--primary-strong);
  font-weight: 700;
}

.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.reveal.in-view {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 960px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }

  .feature-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .menu-btn {
    display: inline-flex;
  }

  .main-nav {
    position: absolute;
    top: 72px;
    right: 4vw;
    left: 4vw;
    display: none;
    flex-direction: column;
    align-items: stretch;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 8px;
    box-shadow: var(--shadow);
  }

  .main-nav.open {
    display: flex;
  }

  .hero {
    padding-top: 40px;
  }

  .hero-metrics {
    grid-template-columns: 1fr;
  }

  .feature-grid {
    grid-template-columns: 1fr;
  }

  .footer-wrap {
    flex-direction: column;
    justify-content: center;
    text-align: center;
    padding: 14px 0;
  }
}