:root {
  color-scheme: light;
  --ink: #111827;
  --muted: #5d6677;
  --paper: #f7fbff;
  --panel: #ffffff;
  --line: #d8e6f8;
  --accent: #1880ff;
  --accent-strong: #0b63d8;
  --sun: #1880ff;
  --rose: #60a8ff;
  --shadow: 0 28px 80px rgba(16, 120, 255, 0.13);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  overflow-x: hidden;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at 16% 8%, rgba(24, 128, 255, 0.16), transparent 28rem),
    linear-gradient(135deg, #f7fbff 0%, #eef6ff 45%, #f8fbff 100%);
  color: var(--ink);
  font-family: ui-serif, "Songti SC", "STSong", "Noto Serif CJK SC", Georgia, serif;
  overflow-x: hidden;
}

a {
  color: inherit;
}

.site-header,
.site-footer {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.site-header {
  min-height: 76px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-weight: 700;
  letter-spacing: 0;
}

.brand span {
  font-size: 21px;
  line-height: 36px;
}

.brand img {
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(23, 23, 19, 0.1);
}

nav {
  display: flex;
  align-items: center;
  gap: 18px;
  font-family: ui-sans-serif, "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 14px;
}

nav a,
.site-footer a {
  color: var(--muted);
  text-decoration: none;
}

nav a:hover,
nav a[aria-current="page"],
.site-footer a:hover {
  color: var(--accent-strong);
}

.hero {
  width: min(1120px, calc(100% - 32px));
  min-height: calc(100vh - 116px);
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(320px, 0.78fr);
  align-items: center;
  gap: 48px;
  padding: 36px 0 96px;
}

.eyebrow {
  margin: 0 0 16px;
  color: var(--accent-strong);
  font-family: ui-sans-serif, "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

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

h1 {
  max-width: 760px;
  margin-bottom: 24px;
  font-size: clamp(48px, 8vw, 96px);
  line-height: 0.96;
  letter-spacing: 0;
}

.lead {
  max-width: 620px;
  color: #3f4858;
  font-family: ui-sans-serif, "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 20px;
  line-height: 1.75;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-family: ui-sans-serif, "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
  transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

.button:hover {
  transform: translateY(-2px);
}

.button.primary {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
  box-shadow: 0 14px 32px rgba(24, 128, 255, 0.24);
}

.button.secondary {
  background: rgba(255, 255, 255, 0.55);
  color: var(--accent-strong);
}

.product-scene {
  position: relative;
  min-height: 620px;
  display: grid;
  place-items: center;
  overflow: visible;
}

.phone {
  position: relative;
  z-index: 1;
  width: min(360px, 100%);
  aspect-ratio: 1206 / 2622;
  padding: 4px;
  border: 1px solid rgba(255, 255, 255, 0.32);
  border-radius: 40px;
  background:
    linear-gradient(145deg, #3d3f42 0%, #101113 38%, #050506 100%);
  box-shadow:
    0 44px 90px rgba(23, 23, 19, 0.22),
    0 12px 28px rgba(24, 128, 255, 0.16),
    inset 0 0 0 1px rgba(255, 255, 255, 0.16),
    inset 0 0 0 2px rgba(0, 0, 0, 0.82);
  overflow: hidden;
}

.phone::before {
  position: absolute;
  inset: 4px;
  z-index: 2;
  border: 1px solid rgba(0, 0, 0, 0.2);
  border-radius: 36px;
  box-shadow:
    inset 0 0 0 1px rgba(255, 255, 255, 0.12),
    inset 0 0 24px rgba(0, 0, 0, 0.08);
  pointer-events: none;
  content: "";
}

.dynamic-island {
  position: absolute;
  top: 2.6%;
  left: 50%;
  z-index: 3;
  width: 25.5%;
  height: 3.15%;
  border-radius: 999px;
  background: #050505;
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.08),
    0 0 0 1px rgba(0, 0, 0, 0.88);
  transform: translateX(-50%);
}

.phone-screen {
  width: 100%;
  height: 100%;
  display: block;
  border-radius: 36px;
  object-fit: cover;
}

.band,
.privacy-strip {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto 96px;
}

.section-heading {
  max-width: 720px;
  margin-bottom: 28px;
}

.section-heading h2,
.privacy-strip h2 {
  font-size: clamp(30px, 5vw, 54px);
  line-height: 1.08;
  letter-spacing: 0;
}

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

.feature-grid article {
  min-height: 250px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.56);
}

.feature-mark {
  color: var(--sun);
  font-family: ui-sans-serif, "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 13px;
  font-weight: 900;
}

.feature-grid h3 {
  margin: 50px 0 14px;
  font-size: 24px;
}

.feature-grid p,
.privacy-strip p,
.legal p,
.legal li {
  color: var(--muted);
  font-family: ui-sans-serif, "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.8;
}

.privacy-strip {
  display: grid;
  grid-template-columns: 1fr 0.72fr;
  gap: 40px;
  align-items: end;
  padding: 44px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #eef6ff;
}

.site-footer {
  min-height: 92px;
  flex-wrap: wrap;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-family: ui-sans-serif, "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 14px;
}

.legal-page {
  width: min(860px, calc(100% - 32px));
  margin: 0 auto;
  padding: 68px 0 92px;
}

.legal {
  padding: 48px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.66);
}

.legal h1 {
  font-size: clamp(40px, 7vw, 72px);
}

.legal .updated {
  color: var(--accent-strong);
  font-weight: 700;
}

.legal section {
  padding-top: 24px;
  margin-top: 24px;
  border-top: 1px solid var(--line);
}

.legal h2 {
  font-size: 22px;
}

.legal a {
  color: var(--accent-strong);
  font-weight: 700;
}

@media (max-width: 820px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
    justify-content: center;
    padding: 16px 0;
  }

  nav {
    flex-wrap: wrap;
  }

  .hero {
    grid-template-columns: 1fr;
    min-height: 0;
    padding-top: 28px;
  }

  .product-scene {
    min-height: 480px;
  }

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

  .privacy-strip,
  .legal {
    padding: 28px;
  }
}

@media (max-width: 520px) {
  .lead {
    font-size: 17px;
  }

  .button {
    width: 100%;
  }

  .product-scene {
    min-height: 430px;
  }

  .phone {
    width: 260px;
  }

  .legal-page {
    padding-top: 36px;
  }
}