:root {
  --page-bg: #f2efe7;
  --surface: rgba(255, 255, 255, 0.82);
  --surface-strong: rgba(255, 255, 255, 0.96);
  --text-main: #15212a;
  --text-soft: #55636f;
  --accent: #1677ff;
  --accent-strong: #0c4dc7;
  --border: rgba(21, 33, 42, 0.1);
  --shadow: 0 30px 80px rgba(17, 32, 48, 0.12);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  font-family: "HarmonyOS Sans SC", "Source Han Sans SC", "Microsoft YaHei UI",
    "PingFang SC", sans-serif;
  color: var(--text-main);
  background:
    radial-gradient(circle at top left, rgba(22, 119, 255, 0.16), transparent 34%),
    radial-gradient(circle at bottom right, rgba(14, 165, 120, 0.14), transparent 26%),
    linear-gradient(180deg, #f7f3eb 0%, var(--page-bg) 100%);
}

body {
  min-height: 100vh;
}

.page-shell {
  width: min(1120px, calc(100vw - 40px));
  margin: 0 auto;
  padding: 48px 0 72px;
}

.hero {
  padding: 36px 40px 32px;
  border-radius: 32px;
  border: 1px solid var(--border);
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.96), rgba(255, 255, 255, 0.72)),
    linear-gradient(120deg, rgba(22, 119, 255, 0.05), rgba(22, 119, 255, 0));
  box-shadow: var(--shadow);
}

.eyebrow {
  margin: 0 0 12px;
  font-size: 13px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent-strong);
}

.hero h1 {
  margin: 0;
  font-size: clamp(42px, 5vw, 72px);
  line-height: 0.98;
  letter-spacing: -0.04em;
}

.hero-copy {
  width: min(760px, 100%);
  margin: 18px 0 0;
  font-size: 18px;
  line-height: 1.7;
  color: var(--text-soft);
}

.hero-notes {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.hero-notes span {
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  padding: 0 16px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid rgba(22, 119, 255, 0.14);
  color: var(--text-main);
  font-size: 14px;
}

.download-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
  margin-top: 28px;
}

.download-panel {
  display: flex;
  flex-direction: column;
  min-height: 420px;
  padding: 32px;
  border-radius: 28px;
  background: var(--surface);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
}

.windows-panel {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(240, 247, 255, 0.88)),
    var(--surface);
}

.panel-label {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  min-height: 34px;
  padding: 0 14px;
  border-radius: 999px;
  background: rgba(21, 33, 42, 0.06);
  color: var(--text-soft);
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.download-panel h2 {
  margin: 18px 0 0;
  font-size: 34px;
  line-height: 1.06;
  letter-spacing: -0.03em;
}

.panel-copy {
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-soft);
}

.version-card {
  margin-top: 20px;
  padding: 18px 18px 16px;
  border-radius: 20px;
  background: var(--surface-strong);
  border: 1px solid rgba(22, 119, 255, 0.12);
}

.version-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
}

.version-row + .version-row {
  margin-top: 10px;
}

.version-key {
  font-size: 13px;
  color: var(--text-soft);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.version-row strong,
.version-row span:last-child {
  font-size: 15px;
  line-height: 1.5;
  text-align: right;
}

.panel-list {
  margin: 22px 0 0;
  padding-left: 20px;
  color: var(--text-main);
  line-height: 1.8;
}

.panel-list li + li {
  margin-top: 4px;
}

.download-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-height: 56px;
  margin-top: auto;
  border-radius: 18px;
  background: linear-gradient(135deg, var(--accent), #3d8fff);
  color: #fff;
  font-size: 17px;
  font-weight: 700;
  text-decoration: none;
  letter-spacing: 0.01em;
  transition: transform 180ms ease, box-shadow 180ms ease, background 180ms ease;
  box-shadow: 0 18px 34px rgba(22, 119, 255, 0.24);
}

.download-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 22px 40px rgba(22, 119, 255, 0.28);
  background: linear-gradient(135deg, #0d63eb, #3182ff);
}

.panel-footnote {
  margin: 14px 0 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-soft);
}

@media (max-width: 900px) {
  .page-shell {
    width: min(100vw - 28px, 100%);
    padding-top: 28px;
    padding-bottom: 36px;
  }

  .hero {
    padding: 28px 22px 24px;
    border-radius: 24px;
  }

  .hero-copy {
    font-size: 16px;
  }

  .download-grid {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  .download-panel {
    min-height: 0;
    padding: 24px 22px;
    border-radius: 24px;
  }

  .version-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }

  .version-row strong,
  .version-row span:last-child {
    text-align: left;
  }

  .download-panel h2 {
    font-size: 30px;
  }
}