/* Two direct website entrances and the eight user-confirmed media channels. */
#platforms.platform-hub { padding-block: 78px; scroll-margin-top: 76px; }
#platforms .platform-hub-heading { gap: 46px; margin-bottom: 32px; }
#platforms .platform-hub-heading h2 { font-size: clamp(30px, 3.7vw, 44px); line-height: 1.23; letter-spacing: -.045em; }
#platforms .platform-hub-heading > p { color: #64718a; font-size: 14px; line-height: 1.85; margin-bottom: 3px; }
#platforms .platform-sites { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
#platforms .platform-site { --platform-accent: #155eef; --platform-soft: #edf4ff; display: flex; flex-direction: column; position: relative; min-width: 0; padding: 24px 25px 20px; border: 1px solid #dce5f1; border-radius: 17px; background: #fff; box-shadow: 0 4px 14px #12213f04; overflow: hidden; transition: border-color .2s, box-shadow .2s, transform .2s; }
#platforms .platform-site:before { content: ""; position: absolute; height: 3px; top: 0; left: 0; right: 0; background: var(--platform-accent); }
#platforms .platform-site--jixuetong { --platform-accent: #117052; --platform-soft: #ecf7f1; }
#platforms .platform-site-top { display: flex; align-items: center; justify-content: space-between; gap: 18px; min-height: 56px; }
#platforms .platform-site-logo { display: flex; align-items: center; min-width: 0; margin: 0; height: 56px; }
#platforms .platform-site-logo img { display: block; width: auto; max-width: 280px; height: auto; max-height: 54px; object-fit: contain; }
#platforms .platform-site-category { flex: 0 0 auto; padding: 5px 10px; border-radius: 6px; background: var(--platform-soft); color: var(--platform-accent); font-size: 11px; font-weight: 650; line-height: 1.7; }
#platforms .platform-site-description { min-height: 48px; margin: 16px 0 18px; color: #627089; font-size: 14px; line-height: 1.75; }
#platforms .platform-site-footer { display: flex; justify-content: space-between; align-items: center; gap: 12px; padding-top: 14px; margin-top: auto; border-top: 1px solid #e7edf4; }
#platforms .platform-site-domain { color: #68778f; font-size: 12px; line-height: 1.7; font-family: ui-monospace, SFMono-Regular, Consolas, monospace; }
#platforms .platform-site-visit { display: inline-flex; flex: 0 0 auto; align-items: center; gap: 9px; color: var(--platform-accent); font-size: 12px; font-weight: 750; white-space: nowrap; }
#platforms .platform-site-visit i { display: grid; place-items: center; width: 28px; height: 28px; border-radius: 50%; background: var(--platform-soft); font-size: 17px; font-style: normal; line-height: 1; }
#platforms .platform-site:hover { border-color: var(--platform-accent); box-shadow: 0 12px 25px #12213f0d; transform: translateY(-3px); }
#platforms .platform-site:focus-visible { outline: 3px solid var(--platform-accent); outline-offset: 4px; }
#platforms .platform-media-panel { margin-top: 20px; padding: 21px 24px 22px; border: 1px solid #e1e8f2; border-radius: 17px; background: #f6f8fc; }
#platforms .platform-media-heading { display: flex; justify-content: space-between; align-items: center; gap: 20px; }
#platforms .platform-media-heading > div { display: flex; align-items: baseline; gap: 16px; }
#platforms .platform-media-heading h3 { margin: 0; color: #12213f; font-size: 20px; font-weight: 750; letter-spacing: -.025em; line-height: 1.5; }
#platforms .platform-media-heading p { margin: 0; color: #708098; font-size: 12px; line-height: 1.8; }
#platforms .platform-media-count { flex: 0 0 auto; color: #718098; font-size: 11px; white-space: nowrap; }
#platforms .platform-media-grid { display: grid; grid-template-columns: repeat(8, minmax(0, 1fr)); gap: 10px; padding: 0; margin: 19px 0 0; list-style: none; }
#platforms .platform-media-item { display: flex; flex-direction: column; align-items: center; gap: 9px; min-width: 0; padding: 12px 4px 10px; border: 1px solid #e9edf4; border-radius: 11px; background: #fff; }
#platforms .platform-media-icon { display: grid; place-items: center; width: 38px; height: 38px; }
#platforms .platform-media-icon img { display: block; width: 32px; height: 32px; border-radius: 7px; object-fit: contain; }
#platforms .platform-media-name { color: #35465f; font-size: 12px; font-weight: 650; line-height: 1.6; white-space: nowrap; }
@media (max-width: 980px) {
  #platforms .platform-site-logo img { max-width: 100%; }
  #platforms .platform-media-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 10px; }
  #platforms .platform-site-top { gap: 12px; }
}
@media (max-width: 640px) {
  #platforms.platform-hub { padding-block: 56px; scroll-margin-top: 68px; }
  #platforms .platform-hub-heading { margin-bottom: 26px; gap: 17px; }
  #platforms .platform-hub-heading h2 { font-size: 30px; }
  #platforms .platform-hub-heading > p { font-size: 13px; }
  #platforms .platform-sites { grid-template-columns: 1fr; gap: 14px; }
  #platforms .platform-site { padding: 21px 20px 18px; border-radius: 14px; }
  #platforms .platform-site-description { min-height: 0; margin-top: 14px; font-size: 13px; }
  #platforms .platform-site-logo { height: 52px; }
  #platforms .platform-site-logo img { max-height: 48px; }
  #platforms .platform-site-top { min-height: 52px; }
  #platforms .platform-media-panel { margin-top: 14px; padding: 18px 16px; border-radius: 14px; }
  #platforms .platform-media-heading { gap: 10px; align-items: flex-start; }
  #platforms .platform-media-heading > div { display: block; }
  #platforms .platform-media-heading h3 { font-size: 19px; }
  #platforms .platform-media-heading p { margin-top: 4px; font-size: 11px; }
  #platforms .platform-media-count { padding-top: 4px; font-size: 10px; }
  #platforms .platform-media-grid { margin-top: 16px; gap: 8px; }
  #platforms .platform-media-item { padding: 11px 2px 9px; gap: 6px; border-radius: 8px; }
  #platforms .platform-media-name { font-size: 11px; }
}
@media (max-width: 374px) {
  #platforms .platform-site-category { display: none; }
  #platforms .platform-site-domain { font-size: 10px; }
  #platforms .platform-site-visit { gap: 5px; font-size: 11px; }
  #platforms .platform-media-panel { padding-inline: 12px; }
  #platforms .platform-media-grid { gap: 6px; }
}
@media (prefers-reduced-motion: reduce) {
  #platforms .platform-site { transition: none; }
  #platforms .platform-site:hover { transform: none; }
}