:root {
  color-scheme: light;
  --bg: #f7f8fb;
  --paper: #ffffff;
  --ink: #17202a;
  --muted: #64707d;
  --line: #dce3ea;
  --accent: #1f78ff;
  --accent-strong: #1246a8;
  --leaf: #2c9b78;
  --coral: #e86d4b;
  --shadow: 0 22px 70px rgba(30, 44, 62, 0.13);
  --shadow-soft: 0 10px 28px rgba(30, 44, 62, 0.1);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  margin: 0;
  background:
    linear-gradient(180deg, #ffffff 0%, var(--bg) 52%, #eef6f3 100%);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.68;
}

a {
  color: var(--accent-strong);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

img {
  max-width: 100%;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid rgba(220, 227, 234, 0.86);
  background: rgba(255, 255, 255, 0.86);
  backdrop-filter: blur(18px);
}

.nav {
  width: min(1120px, calc(100% - 32px));
  min-height: 68px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  text-decoration: none;
  font-weight: 850;
}

.brand img {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  box-shadow: var(--shadow-soft);
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px;
}

.nav-links a {
  padding: 8px 11px;
  border-radius: 999px;
  color: var(--muted);
  text-decoration: none;
  font-size: 13px;
  font-weight: 760;
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  background: #fff;
  color: var(--ink);
  box-shadow: inset 0 0 0 1px var(--line);
}

main {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.hero {
  min-height: calc(100vh - 112px);
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(340px, 440px);
  align-items: center;
  gap: clamp(34px, 6vw, 76px);
  padding: clamp(38px, 7vh, 86px) 0;
}

.hero-copy {
  min-width: 0;
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.16;
  letter-spacing: 0;
}

h1 {
  max-width: 720px;
  font-family: "Songti SC", "STSong", "Noto Serif CJK SC", serif;
  font-size: clamp(40px, 5vw, 64px);
  font-weight: 820;
}

h2 {
  font-size: 26px;
  font-weight: 900;
}

h3 {
  font-size: 17px;
  font-weight: 880;
}

.lead {
  max-width: 620px;
  margin: 20px 0 0;
  color: var(--muted);
  font-size: 17px;
}

.lead.narrow {
  max-width: 720px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

.button {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  padding: 10px 16px;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  font-size: 14px;
  font-weight: 840;
  box-shadow: 0 12px 26px rgba(31, 120, 255, 0.24);
}

.button.secondary {
  background: #fff;
  color: var(--accent-strong);
  box-shadow: inset 0 0 0 1px var(--line);
}

.summary-list {
  display: grid;
  gap: 9px;
  margin: 24px 0 0;
  padding: 0;
  color: var(--muted);
  list-style: none;
  font-size: 14px;
}

.summary-list li {
  position: relative;
  padding-left: 18px;
}

.summary-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.78em;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--leaf);
}

.hero-visual {
  position: relative;
  min-height: 560px;
}

.app-tile,
.map-frame,
.photo-frame,
.feature-grid article,
.document,
.contact-panel {
  border: 1px solid rgba(220, 227, 234, 0.9);
  background: rgba(255, 255, 255, 0.9);
  box-shadow: var(--shadow);
}

.app-tile {
  position: absolute;
  top: 16px;
  left: 8px;
  z-index: 2;
  display: flex;
  align-items: center;
  gap: 12px;
  width: min(340px, calc(100% - 20px));
  padding: 14px;
  border-radius: 8px;
}

.app-icon {
  width: 64px;
  height: 64px;
  border-radius: 14px;
  flex: 0 0 auto;
  box-shadow: var(--shadow-soft);
}

.tile-title,
.tile-subtitle {
  margin: 0;
}

.tile-title {
  font-size: 18px;
  font-weight: 900;
}

.tile-subtitle {
  color: var(--muted);
  font-size: 13px;
}

.map-frame {
  position: absolute;
  top: 116px;
  right: 0;
  width: min(430px, 95%);
  padding: 16px;
  border-radius: 8px;
}

.map-frame img {
  display: block;
  border-radius: 6px;
}

.photo-frame {
  position: absolute;
  left: 0;
  bottom: 28px;
  width: min(360px, 86%);
  padding: 12px;
  border-radius: 8px;
}

.photo-frame img {
  display: block;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: 6px;
}

.content-band {
  padding: 0 0 clamp(54px, 8vh, 96px);
}

.section-heading {
  max-width: 700px;
}

.section-heading p,
.feature-grid p,
.document p,
.document li {
  color: var(--muted);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-top: 22px;
}

.feature-grid article {
  min-height: 176px;
  padding: 20px;
  border-radius: 8px;
}

.feature-grid p {
  margin: 12px 0 0;
  font-size: 14px;
}

.document-page {
  padding: clamp(34px, 6vh, 72px) 0 clamp(56px, 8vh, 92px);
}

.document {
  max-width: 860px;
  padding: clamp(24px, 4vw, 44px);
  border-radius: 8px;
}

.document h1 {
  font-size: clamp(34px, 4vw, 48px);
}

.document h2 {
  margin-top: 30px;
}

.document p,
.document li {
  font-size: 15px;
}

.updated {
  margin-top: 12px;
}

.contact-panel {
  margin-top: 24px;
  padding: 20px;
  border-radius: 8px;
}

.contact-label {
  margin: 0 0 6px;
  font-size: 13px;
  font-weight: 850;
}

.contact-link {
  font-size: 22px;
  font-weight: 900;
}

.site-footer {
  border-top: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.78);
}

.footer-inner {
  width: min(1120px, calc(100% - 32px));
  min-height: 72px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 18px;
  color: var(--muted);
  font-size: 13px;
}

@media (max-width: 860px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
    padding: 12px 0;
  }

  .nav-links {
    justify-content: flex-start;
  }

  .hero {
    min-height: 0;
    grid-template-columns: 1fr;
  }

  .hero-visual {
    min-height: 480px;
  }

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

@media (max-width: 520px) {
  main,
  .nav,
  .footer-inner {
    width: min(100% - 24px, 1120px);
  }

  h1 {
    font-size: 36px;
  }

  .hero {
    padding-top: 28px;
  }

  .hero-visual {
    min-height: 430px;
  }

  .app-tile,
  .map-frame,
  .photo-frame {
    position: relative;
    inset: auto;
    width: 100%;
    margin-top: 12px;
  }

  .contact-link {
    font-size: 18px;
  }
}