:root {
  color-scheme: light;
  --bg: #f6f8fb;
  --surface: #ffffff;
  --surface-strong: #eef4ff;
  --text: #172033;
  --muted: #667085;
  --line: #d9e1ee;
  --primary: #1e63ff;
  --primary-dark: #174bd1;
  --accent: #15b8a6;
  --shadow: 0 24px 70px rgba(25, 42, 80, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 12% 10%, rgba(30, 99, 255, 0.12), transparent 28%),
    radial-gradient(circle at 88% 18%, rgba(21, 184, 166, 0.13), transparent 26%),
    var(--bg);
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 18px clamp(20px, 5vw, 72px);
  background: rgba(246, 248, 251, 0.86);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(217, 225, 238, 0.72);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
}

.brand__icon {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--accent));
}

.brand__text {
  font-size: 18px;
}

.site-nav {
  display: flex;
  gap: 22px;
  color: var(--muted);
  font-size: 14px;
}

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

.hero,
.section {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
}

.hero {
  min-height: 680px;
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(320px, 0.72fr);
  align-items: center;
  gap: 56px;
  padding: 72px 0 60px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--primary);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0.08em;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 22px;
  font-size: clamp(46px, 8vw, 82px);
  line-height: 0.98;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 16px;
  font-size: clamp(30px, 4vw, 46px);
  line-height: 1.12;
}

h3 {
  margin-bottom: 12px;
  font-size: 20px;
}

.hero__desc,
.section p,
.feature-card p,
.policy-card p {
  color: var(--muted);
  line-height: 1.78;
}

.hero__desc {
  max-width: 680px;
  font-size: 18px;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.btn {
  min-width: 164px;
  height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  font-weight: 800;
}

.btn--primary {
  color: #fff;
  background: var(--primary);
  box-shadow: 0 16px 34px rgba(30, 99, 255, 0.28);
}

.btn--primary:hover {
  background: var(--primary-dark);
}

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

.hero__note {
  margin-top: 18px;
  color: var(--muted);
  font-size: 13px;
}

.phone-preview {
  justify-self: center;
  width: min(360px, 100%);
  aspect-ratio: 9 / 16;
  padding: 14px;
  border-radius: 38px;
  background: #111827;
  box-shadow: var(--shadow);
}

.phone-preview__screen {
  height: 100%;
  padding: 22px;
  border-radius: 28px;
  background: linear-gradient(180deg, #eaf2ff 0%, #ffffff 100%);
}

.preview-card--large {
  height: 42%;
  border-radius: 18px;
  background: linear-gradient(135deg, #1e63ff, #15b8a6);
}

.preview-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 16px;
}

.preview-row div,
.preview-list span {
  display: block;
  border-radius: 14px;
  background: var(--surface-strong);
}

.preview-row div {
  height: 118px;
}

.preview-list {
  display: grid;
  gap: 12px;
  margin-top: 18px;
}

.preview-list span {
  height: 16px;
}

.section {
  padding: 72px 0;
}

.section__head {
  max-width: 720px;
  margin-bottom: 30px;
}

.feature-grid,
.policy-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.feature-card,
.policy-card,
.info-panel,
.section--contact {
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.86);
  box-shadow: 0 14px 44px rgba(25, 42, 80, 0.08);
}

.feature-card,
.policy-card {
  min-height: 210px;
  padding: 24px;
}

.policy-card:hover {
  border-color: rgba(30, 99, 255, 0.45);
}

.section--split {
  display: grid;
  grid-template-columns: 1fr 420px;
  gap: 34px;
  align-items: center;
}

.info-panel {
  padding: 22px;
}

.info-row {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.info-row:last-child {
  border-bottom: 0;
}

.info-row span {
  color: var(--muted);
}

.section--contact {
  margin-bottom: 70px;
  padding: 34px;
}

.section--contact a {
  color: var(--primary);
  font-weight: 800;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 24px clamp(20px, 5vw, 72px);
  color: var(--muted);
  border-top: 1px solid var(--line);
}

.doc-page {
  width: min(900px, calc(100% - 40px));
  margin: 0 auto;
  padding: 48px 0 80px;
}

.doc-card {
  padding: clamp(24px, 5vw, 46px);
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #fff;
  box-shadow: var(--shadow);
}

.doc-card h1 {
  font-size: clamp(32px, 6vw, 54px);
}

.doc-card h2 {
  margin-top: 32px;
  font-size: 24px;
}

.doc-card p,
.doc-card li {
  color: var(--muted);
  line-height: 1.8;
}

.doc-back {
  display: inline-flex;
  margin-bottom: 20px;
  color: var(--primary);
  font-weight: 800;
}

@media (max-width: 860px) {
  .site-header,
  .site-footer {
    align-items: flex-start;
    flex-direction: column;
  }

  .site-nav {
    width: 100%;
    justify-content: space-between;
  }

  .hero,
  .section--split {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
    gap: 36px;
    padding-top: 48px;
  }

  .phone-preview {
    width: min(300px, 86vw);
  }

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