:root {
  --blue: #1994d3;
  --blue-dark: #157db6;
  --text: #4e7897;
  --muted: #91aabd;
}

* {
  box-sizing: border-box;
}

html {
  background: #fff;
}

body {
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 92% 5%, rgba(45, 160, 219, 0.045), transparent 20rem),
    #fff;
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
  -webkit-tap-highlight-color: transparent;
}

main {
  width: min(1180px, calc(100% - 64px));
  margin: 0 auto;
  padding: 24px 0 72px;
}

.hero {
  max-width: 980px;
  padding-bottom: 68px;
}

.eyebrow {
  margin: 0 0 34px;
  display: flex;
  align-items: center;
  gap: 16px;
  color: #438fc7;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.28em;
}

.eyebrow span {
  width: 40px;
  height: 1px;
  display: block;
  background: #4b9ed3;
}

.brand-row {
  margin-bottom: 25px;
  display: flex;
  align-items: center;
  gap: 15px;
}

.brand-row img {
  border-radius: 14px;
  box-shadow: 0 9px 24px rgba(30, 116, 184, 0.13);
}

.brand-row p {
  margin: 0;
  color: #6f91aa;
  font-size: 14px;
}

h1 {
  max-width: 940px;
  margin: 0;
  color: var(--blue);
  font-size: clamp(54px, 6.7vw, 82px);
  font-weight: 500;
  line-height: 1.18;
  letter-spacing: -0.055em;
}

h2 {
  margin: 28px 0 18px;
  color: var(--blue-dark);
  font-size: 23px;
  font-weight: 800;
  line-height: 1.5;
}

.description {
  max-width: 930px;
  margin: 0;
  color: #5d7e97;
  font-size: 17px;
  line-height: 2.05;
}

.download-actions {
  margin-top: 35px;
  display: flex;
  gap: 16px;
}

.download-button {
  width: 232px;
  min-height: 64px;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border: 1px solid #c6e2f2;
  border-radius: 15px;
  color: #1978af;
  background: #f8fcff;
  font-size: 15px;
}

.download-button.primary {
  color: #fff;
  border-color: transparent;
  background: linear-gradient(135deg, #248fd0, #65b9e7);
  box-shadow: 0 12px 28px rgba(35, 143, 208, 0.16);
}

.download-note {
  margin: 15px 0 0;
  color: var(--muted);
  font-size: 12px;
}

.poster-grid {
  padding-top: 48px;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
  border-top: 1px solid #e2edf4;
}

.poster-grid figure {
  margin: 0;
  overflow: hidden;
  border-radius: 16px;
  background: #edf6fc;
  box-shadow: 0 12px 30px rgba(39, 102, 143, 0.1);
}

.poster-grid img {
  width: 100%;
  height: auto;
  display: block;
}

@media (max-width: 920px) {
  main {
    width: min(100% - 40px, 760px);
  }

  .poster-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 620px) {
  main {
    width: calc(100% - 32px);
    padding: 20px 0 42px;
  }

  .hero {
    padding-bottom: 42px;
  }

  .eyebrow {
    margin-bottom: 27px;
    gap: 11px;
    font-size: 10px;
    letter-spacing: 0.2em;
  }

  .eyebrow span {
    width: 27px;
  }

  .brand-row {
    margin-bottom: 20px;
  }

  .brand-row img {
    width: 52px;
    height: 52px;
    border-radius: 12px;
  }

  .brand-row p {
    font-size: 12px;
  }

  h1 {
    font-size: clamp(39px, 12vw, 54px);
    line-height: 1.16;
    letter-spacing: -0.045em;
  }

  h2 {
    margin: 24px 0 13px;
    font-size: 18px;
  }

  .description {
    font-size: 15px;
    line-height: 1.9;
  }

  .download-actions {
    margin-top: 28px;
    flex-direction: column;
    gap: 12px;
  }

  .download-button {
    width: 100%;
    min-height: 58px;
  }

  .download-note {
    line-height: 1.7;
  }

  .poster-grid {
    padding-top: 32px;
    grid-template-columns: 1fr;
    gap: 18px;
  }

  .poster-grid figure {
    border-radius: 13px;
  }
}