:root {
  --bg: #f6fbff;
  --bg-strong: #ffffff;
  --text: #16324f;
  --muted: #5f7891;
  --brand: #1f75ff;
  --brand-deep: #0f58cb;
  --accent: #ff8c2a;
  --line: #d5e8ff;
  --card: #ffffff;
  --white: #ffffff;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: linear-gradient(180deg, #f8fcff 0%, #eef6ff 38%, #f7fbff 100%);
  line-height: 1.6;
}

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

.container {
  width: min(1140px, 92%);
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(8px);
  background: rgba(255, 255, 255, 0.9);
  border-bottom: 1px solid #dbeafe;
}

.nav-wrap {
  min-height: 74px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.brand-logo {
  width: 150px;
  height: auto;
  border-radius: 8px;
  border: 1px solid #dbeafe;
  background: #fff;
}

.brand-note {
  color: var(--muted);
  font-size: 13px;
}

.nav {
  display: flex;
  gap: 22px;
  color: #41627f;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  padding: 12px 22px;
  font-weight: 600;
  transition: all 0.2s ease;
  border: 1px solid transparent;
}

.btn-small {
  padding: 9px 16px;
  background: linear-gradient(120deg, var(--brand), var(--brand-deep));
  color: var(--white);
}

.btn-primary {
  background: linear-gradient(120deg, var(--brand), var(--brand-deep));
  color: var(--white);
  box-shadow: 0 10px 24px rgba(31, 117, 255, 0.28);
}

.btn-primary:hover {
  transform: translateY(-1px);
}

.btn-ghost {
  border-color: #bed8ff;
  color: var(--brand);
  background: #ffffff;
}

.btn-ghost:hover {
  background: #eef5ff;
}

.hero {
  padding: 52px 0 48px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 26px;
  align-items: center;
}

.kicker {
  margin: 0 0 10px;
  color: var(--brand);
  font-weight: 600;
  letter-spacing: 0.06em;
}

h1 {
  margin: 0;
  font-size: clamp(34px, 5vw, 56px);
  line-height: 1.15;
  color: #0f2942;
}

.lead {
  margin: 16px 0 0;
  color: #4f6982;
  font-size: 18px;
  max-width: 62ch;
}

.hero-actions {
  display: flex;
  gap: 14px;
  margin-top: 26px;
  flex-wrap: wrap;
}

.hero-points {
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.hero-points li {
  padding: 7px 12px;
  border-radius: 999px;
  background: #ffffff;
  border: 1px solid #cfe3ff;
  color: #305879;
  font-size: 14px;
}

.hero-right {
  display: grid;
  gap: 14px;
}

.download-panel {
  background: var(--card);
  border: 1px solid #cfe3ff;
  border-radius: 16px;
  padding: 18px;
  box-shadow: 0 16px 36px rgba(31, 117, 255, 0.1);
}

.download-panel h2 {
  font-size: 28px;
  margin: 0;
  color: #0e3355;
}

.download-panel p {
  margin: 8px 0 14px;
  color: var(--muted);
}

.panel-btn {
  width: 100%;
}

.panel-meta {
  margin: 12px 0 0;
  padding-left: 16px;
  color: #4f6982;
}

.panel-meta li::marker {
  color: var(--accent);
}

.hero-visual img {
  width: 100%;
  border-radius: 16px;
  border: 1px solid #cfe3ff;
  box-shadow: 0 20px 44px rgba(15, 88, 203, 0.16);
  object-fit: cover;
  min-height: 300px;
}

.features {
  padding: 24px 0 56px;
}

h2 {
  margin: 0;
  font-size: clamp(28px, 3.5vw, 40px);
}

.section-lead {
  margin: 12px 0 28px;
  color: var(--muted);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 22px;
  box-shadow: 0 10px 26px rgba(31, 117, 255, 0.08);
}

.card h3 {
  margin: 0 0 8px;
}

.card p {
  margin: 0;
  color: #4f6982;
}

.cta {
  padding: 8px 0 56px;
}

.cta-box {
  border: 1px solid #cfe3ff;
  border-radius: 22px;
  background: linear-gradient(130deg, #edf5ff, #fff8f1);
  padding: 34px;
  text-align: center;
}

.cta-box p {
  color: #4f6982;
}

.faq {
  padding-bottom: 70px;
}

.faq details {
  border: 1px solid #dbeafe;
  border-radius: 12px;
  padding: 14px 16px;
  margin-bottom: 12px;
  background: #ffffff;
}

.faq summary {
  cursor: pointer;
  font-weight: 600;
}

.faq p {
  margin: 10px 0 0;
  color: #4f6982;
}

.site-footer {
  border-top: 1px solid #dbeafe;
  padding: 22px 0 28px;
  background: #ffffffb0;
}

.footer-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  color: var(--muted);
  font-size: 14px;
}

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

@media (max-width: 980px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }

  .nav {
    display: none;
  }

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

@media (max-width: 620px) {
  .brand-note {
    display: none;
  }

  .btn-small {
    display: none;
  }

  .footer-wrap {
    flex-direction: column;
    align-items: flex-start;
  }
}