:root {
  color-scheme: light;
  --blue: #1d7cf2;
  --cyan: #48b9ff;
  --green: #2ed8c3;
  --ink: #0a1a33;
  --muted: #7a8799;
  --line: rgba(10, 26, 51, 0.1);
  --surface: rgba(255, 255, 255, 0.78);
  font-family: Inter, "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC",
    Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100vh;
  min-height: 100dvh;
  scroll-behavior: smooth;
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100%;
  margin: 0;
  color: var(--ink);
  background: radial-gradient(
      circle at 50% 0,
      rgba(72, 185, 255, 0.2),
      transparent 34rem
    ),
    linear-gradient(180deg, #ffffff 0%, #f6f9fd 64%, #eef5fc 100%);
}

main {
  flex: 1 0 auto;
}

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

button {
  font: inherit;
}

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
  padding: 0 clamp(24px, 6vw, 88px);
  background: rgba(255, 255, 255, 0.72);
  border-bottom: 1px solid rgba(255, 255, 255, 0.86);
  backdrop-filter: blur(20px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-size: 20px;
  font-weight: 800;
}

.brand img {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  box-shadow: 0 10px 22px rgba(29, 124, 242, 0.22);
}

.header-download {
  min-width: 82px;
  height: 38px;
  border: 1px solid rgba(29, 124, 242, 0.28);
  border-radius: 999px;
  color: var(--blue);
  font-size: 14px;
  font-weight: 700;
  line-height: 36px;
  text-align: center;
  background: rgba(255, 255, 255, 0.7);
}

.hero {
  min-height: 760px;
  padding: 148px 24px 70px;
  text-align: center;
}

.brand-mark {
  position: relative;
  width: 168px;
  height: 168px;
  margin: 0 auto 28px;
  border-radius: 42px;
  background: rgba(255, 255, 255, 0.86);
  box-shadow: 0 32px 80px rgba(29, 124, 242, 0.22),
    inset 0 0 0 1px rgba(255, 255, 255, 0.8);
}

.brand-mark::after {
  content: "";
  position: absolute;
  inset: 18px;
  border-radius: 32px;
  border: 1px solid rgba(46, 216, 195, 0.2);
}

.brand-mark img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  padding: 18px;
}

.product-en {
  margin: 0 0 10px;
  color: var(--blue);
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 0;
}

h1 {
  margin: 0;
  font-size: clamp(54px, 8vw, 96px);
  line-height: 1.04;
  font-weight: 900;
}

.slogan {
  margin: 18px 0 46px;
  color: #4c596d;
  font-size: clamp(20px, 2.4vw, 28px);
}

.download-panel {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  width: min(720px, 100%);
  margin: 0 auto;
}

.download-option {
  display: grid;
  grid-template-columns: 52px 1fr;
  grid-template-rows: auto auto;
  column-gap: 14px;
  align-items: center;
  min-height: 86px;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: 18px;
  color: var(--ink);
  text-align: left;
  cursor: pointer;
  background: var(--surface);
  box-shadow: 0 18px 46px rgba(10, 26, 51, 0.08);
  backdrop-filter: blur(18px);
  transition: transform 0.18s ease, border-color 0.18s ease,
    box-shadow 0.18s ease;
}

.download-option:hover {
  transform: translateY(-3px);
  border-color: rgba(29, 124, 242, 0.34);
  box-shadow: 0 22px 56px rgba(29, 124, 242, 0.18);
}

.download-option.is-upcoming {
  cursor: default;
}

.download-option.is-upcoming:hover {
  transform: none;
  border-color: var(--line);
  box-shadow: 0 18px 46px rgba(10, 26, 51, 0.08);
}

.platform-icon {
  grid-row: 1 / 3;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  border-radius: 14px;
  color: #ffffff;
  background: linear-gradient(135deg, var(--blue), var(--cyan));
  font-size: 13px;
  font-weight: 900;
}

.platform-icon-ios {
  background: linear-gradient(135deg, #1d2939, #667085);
}

.platform-icon-android {
  background: linear-gradient(135deg, #16a36a, var(--green));
  font-size: 17px;
}

.download-option strong {
  font-size: 19px;
  line-height: 1.2;
}

.download-option em {
  color: var(--muted);
  font-size: 13px;
  font-style: normal;
}

.brief {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  width: min(880px, calc(100% - 48px));
  margin: -38px auto 92px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: var(--line);
  box-shadow: 0 24px 70px rgba(10, 26, 51, 0.08);
}

.brief div {
  display: grid;
  align-content: start;
  gap: 12px;
  min-height: 148px;
  padding: 32px 34px;
  background: rgba(255, 255, 255, 0.78);
  backdrop-filter: blur(16px);
}

.brief strong {
  font-size: 18px;
}

.brief span {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.85;
}

.site-footer {
  flex-shrink: 0;
  padding: 0 24px;
  border-top: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.5);
  backdrop-filter: blur(18px);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(1120px, 100%);
  min-height: 112px;
  margin: 0 auto;
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
}

.footer-brand img {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  box-shadow: 0 10px 28px rgba(29, 124, 242, 0.18);
}

.footer-brand span {
  display: grid;
  gap: 4px;
}

.footer-brand strong {
  color: var(--ink);
  font-size: 16px;
}

.footer-brand small,
.site-footer p {
  color: var(--muted);
  font-size: 12px;
}

.site-footer p {
  margin: 0;
}

@media (max-width: 760px) {
  .site-header {
    height: 66px;
  }

  .brand span {
    font-size: 18px;
  }

  .hero {
    min-height: auto;
    padding: 106px 18px 48px;
  }

  .brand-mark {
    width: 124px;
    height: 124px;
    border-radius: 34px;
    margin-bottom: 24px;
  }

  .product-en {
    font-size: 13px;
  }

  h1 {
    font-size: clamp(48px, 17vw, 64px);
  }

  .slogan {
    margin: 14px 0 34px;
    font-size: 20px;
  }

  .download-panel,
  .brief {
    grid-template-columns: 1fr;
  }

  .download-panel {
    gap: 12px;
  }

  .download-option {
    min-height: 78px;
  }

  .brief {
    width: calc(100% - 36px);
    margin-top: 0;
    margin-bottom: 56px;
    border-radius: 18px;
  }

  .brief div {
    min-height: 132px;
    padding: 26px;
  }

  .site-footer {
    padding: 0 18px;
  }

  .footer-inner {
    display: grid;
    justify-items: center;
    justify-content: center;
    gap: 18px;
    min-height: 154px;
    padding: 28px 0;
    text-align: center;
  }
}