:root {
  font-family: "Microsoft YaHei UI", "PingFang SC", "Segoe UI", sans-serif;
  color: #172229;
  background: #f5f7f8;
  font-synthesis: none;
  letter-spacing: 0;
  --ink: #111a22;
  --muted: #66757c;
  --line: #dce3e7;
  --paper: #fff;
  --green: #f45b5b;
  --green-dark: #d94848;
  --purple: #6f54d9;
}

* { box-sizing: border-box; }
body { margin: 0; min-width: 320px; min-height: 100vh; background: #f5f7f8; }
body, a { letter-spacing: 0; }
a { color: inherit; text-decoration: none; }

.download-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  padding: 0 max(24px, calc((100vw - 1120px) / 2));
  border-bottom: 1px solid var(--line);
  background: rgba(255,255,255,.96);
}
.brand { display: inline-flex; align-items: center; gap: 11px; min-width: 0; }
.brand img { width: 38px; height: 38px; border-radius: 8px; }
.brand span { display: grid; gap: 2px; }
.brand strong { color: var(--ink); font-size: 15px; }
.brand small { color: #77858b; font-size: 10px; }
.back-link { color: #506068; font-size: 13px; }
.back-link:hover { color: var(--green-dark); }


main { min-height: calc(100vh - 190px); }
.download-intro {
  padding: 82px max(24px, calc((100vw - 1120px) / 2)) 68px;
  color: #fff;
  background: #111a22;
}
.eyebrow { margin: 0 0 13px; color: var(--green-dark); font-size: 12px; font-weight: 800; }
.download-intro .eyebrow { color: #ff817b; }
.download-intro h1 { margin: 0; font-size: 48px; line-height: 1.16; }
.download-intro > p:not(.eyebrow) { max-width: 700px; margin: 20px 0 0; color: #c4d0d5; font-size: 15px; line-height: 1.85; }
.download-intro .download-pitch { margin-top: 18px; color: #fff; font-size: 22px; font-weight: 800; line-height: 1.45; }
.download-intro .download-summary { margin-top: 10px; }
.platform-list { display: flex; flex-wrap: wrap; gap: 8px; margin: 28px 0 0; padding: 0; list-style: none; }
.platform-list li { padding: 7px 11px; border: 1px solid rgba(255,255,255,.2); border-radius: 999px; color: #e8f0f3; background: rgba(255,255,255,.08); font-size: 12px; font-weight: 700; }
.release-meta { display: flex; align-items: center; flex-wrap: wrap; gap: 10px 14px; margin-top: 34px; color: #aebcc2; font-size: 12px; }
.release-meta strong { color: #fff; font-size: 13px; }
.release-dot { width: 8px; height: 8px; border-radius: 50%; background: #4b9fe3; box-shadow: 0 0 0 5px rgba(75,159,227,.14); }

.channel-section { width: min(1120px, calc(100% - 48px)); margin: 0 auto; padding: 72px 0; }
.section-heading { display: grid; grid-template-columns: minmax(220px, .65fr) minmax(0, 1.35fr); gap: 52px; align-items: end; }
.section-heading h2 { margin: 0; color: var(--ink); font-size: 32px; }
.section-heading > p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.8; }
.channel-list { display: grid; gap: 12px; margin-top: 36px; }
.channel-loading { padding: 28px; border: 1px solid var(--line); border-radius: 8px; color: var(--muted); background: var(--paper); font-size: 13px; }
.channel-item { display: grid; grid-template-columns: 52px minmax(0, 1fr) auto; align-items: center; gap: 20px; min-height: 118px; padding: 22px 24px; border: 1px solid var(--line); border-radius: 8px; background: var(--paper); }
.channel-mark { display: grid; place-items: center; width: 52px; height: 52px; border-radius: 8px; color: #fff; background: var(--ink); font-size: 20px; font-weight: 900; }
.channel-cos { border-color: #b8d6ea; background: #f8fcff; }
.channel-cos .channel-mark { background: #1677b8; }
.channel-cos .channel-action { background: #1677b8; }
.channel-cos .channel-action:hover { background: #0f659f; }
.channel-title-row { display: flex; align-items: center; flex-wrap: wrap; gap: 9px; }
.channel-copy h3 { margin: 0; color: var(--ink); font-size: 18px; }
.channel-copy p { margin: 8px 0 0; color: var(--muted); font-size: 12px; line-height: 1.65; }
.channel-badge { padding: 3px 7px; border-radius: 4px; color: #6a4d11; background: #fff2c9; font-size: 10px; font-weight: 800; }
.channel-action { display: inline-flex; align-items: center; justify-content: center; min-width: 112px; min-height: 42px; padding: 0 16px; border-radius: 6px; color: #fff; background: var(--ink); font-size: 13px; font-weight: 800; }
.channel-action:hover { background: #263640; }
.channel-action.is-disabled { color: #8b989e; background: #edf1f2; cursor: default; }
.channel-error { margin: 18px 0 0; padding: 16px 18px; border: 1px solid #efcfcc; border-radius: 7px; color: #8b3732; background: #fff4f2; font-size: 12px; }

.download-notes { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); width: min(1120px, calc(100% - 48px)); margin: 0 auto 80px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.download-notes article { display: flex; gap: 16px; min-height: 160px; padding: 28px 24px; border-right: 1px solid var(--line); }
.download-notes article:last-child { border-right: 0; }
.download-notes article > span { color: #aa7b19; font-size: 12px; font-weight: 900; }
.download-notes h2 { margin: 0 0 9px; color: var(--ink); font-size: 15px; }
.download-notes p { margin: 0; color: var(--muted); font-size: 11px; line-height: 1.8; }

.download-footer { display: flex; justify-content: space-between; gap: 24px; padding: 34px max(24px, calc((100vw - 1120px) / 2)); color: #91a0a7; background: #0c1318; font-size: 11px; }
.download-footer p { margin: 0; }
.download-footer a { color: #fff; }

@media (max-width: 720px) {
  .download-header { min-height: 64px; padding-inline: 18px; }
  .brand small { display: none; }
  .download-intro { padding: 66px 18px 54px; }
  .download-intro h1 { font-size: 38px; }
  .download-intro .download-pitch { font-size: 19px; }
  .channel-section { width: calc(100% - 36px); padding: 56px 0; }
  .section-heading { grid-template-columns: 1fr; gap: 16px; }
  .section-heading h2 { font-size: 28px; }
  .channel-item { grid-template-columns: 46px minmax(0, 1fr); gap: 14px; padding: 18px; }
  .channel-mark { width: 46px; height: 46px; }
  .channel-action { grid-column: 1 / -1; width: 100%; min-height: 44px; }
  .download-notes { grid-template-columns: 1fr; width: calc(100% - 36px); margin-bottom: 58px; }
  .download-notes article { min-height: 0; border-right: 0; border-bottom: 1px solid var(--line); }
  .download-notes article:last-child { border-bottom: 0; }
  .download-footer { display: grid; padding: 30px 18px; }
}