:root {
  color-scheme: light;
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Yu Gothic", Meiryo, sans-serif;
  color: #202b3b;
  background: #ffffff;
  font-synthesis: none;
  line-height: 1.7;
  -webkit-text-size-adjust: 100%;
}

* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; }
.portal { width: min(100% - 96px, 1120px); margin: 0 auto; padding: 80px 0; }
.page-heading { padding-bottom: 32px; margin-bottom: 40px; border-bottom: 1px solid #e5e9ef; }
h1 { margin: 0; font-size: 2.5rem; font-weight: 700; letter-spacing: .02em; line-height: 1.4; }
.page-heading p { margin: 12px 0 0; color: #596577; font-size: 1.125rem; }
.site-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 24px; padding: 0; margin: 0; list-style: none; }
.site-card { min-width: 0; display: flex; flex-direction: column; padding: 28px; min-height: 304px; border: 1px solid #cbd4e1; border-top: 3px solid #243b5d; border-radius: 14px; background: #fff; }
.site-card--unset { border: 1px dashed #c9d1dd; background: #fafbfc; }
.listing-label { align-self: flex-start; color: #455975; background: #edf2f8; padding: 3px 10px; border-radius: 5px; font-size: .875rem; font-weight: 600; }
.site-card--unset .listing-label { background: #eef0f3; color: #626e7f; }
.site-name { margin: 20px 0 10px; font-size: 1.875rem; font-weight: 700; line-height: 1.45; overflow-wrap: anywhere; }
.site-description { margin: 0 0 30px; color: #596577; font-size: 1rem; overflow-wrap: anywhere; }
.site-action { margin-top: auto; }
.open-button { min-height: 52px; width: 100%; display: flex; align-items: center; justify-content: center; padding: 12px 16px; border: 1px solid transparent; border-radius: 8px; font-size: 1rem; font-weight: 600; text-align: center; line-height: 1.6; overflow-wrap: anywhere; }
a.open-button { color: #fff; background: #243b5d; text-decoration: none; }
a.open-button:hover { background: #314e78; }
a.open-button:focus-visible { outline: 3px solid #2563eb; outline-offset: 5px; }
.open-button--unset { color: #647084; background: #edf0f4; border-color: #e0e5ec; cursor: default; }
.new-tab-note { margin: 10px 0 0; text-align: center; color: #596577; font-size: .875rem; }
.notice { color: #596577; font-size: 1rem; }

@media (max-width: 800px) {
  .portal { width: min(100% - 48px, 520px); padding: 40px 0; }
  h1 { font-size: 2rem; }
  .page-heading { padding-bottom: 24px; margin-bottom: 28px; }
  .site-grid { grid-template-columns: minmax(0, 1fr); gap: 18px; }
  .site-card { min-height: 252px; padding: 24px; }
  .site-name { font-size: 1.75rem; margin-top: 16px; }
  .site-description { margin-bottom: 24px; }
}

@media (max-width: 350px) {
  .portal { width: calc(100% - 32px); }
  .site-card { padding: 20px; }
}