:root {
  --page: #f1f2f3;
  --surface: #fafafa;
  --text: #252525;
  --muted: #6f7175;
  --burgundy: #761f2c;
  --line: #d7d9dc;
  --focus: rgba(118, 31, 44, 0.22);
  --body: 16px;
  --small: 13px;
  --medium: clamp(18px, 2vw, 22px);
  --large: clamp(31px, 5vw, 48px);
  color-scheme: light;
  font-family:
    "Hiragino Sans",
    "Yu Gothic",
    "YuGothic",
    "Noto Sans JP",
    system-ui,
    sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  margin: 0;
  background: var(--page);
  color: var(--text);
  font-size: var(--body);
  line-height: 1.75;
}

a {
  color: inherit;
}

a:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 5px;
}

.site-shell {
  width: min(840px, calc(100% - 40px));
  margin: 0 auto;
  padding: clamp(48px, 8vw, 88px) 0 34px;
}

.site-header {
  padding-bottom: clamp(34px, 6vw, 56px);
  border-bottom: 1px solid var(--line);
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--burgundy);
  font-family:
    ui-monospace,
    "SFMono-Regular",
    Consolas,
    "Liberation Mono",
    monospace;
  font-size: var(--small);
}

h1,
h2,
p {
  overflow-wrap: anywhere;
}

h1 {
  margin: 0;
  color: var(--text);
  font-family:
    Georgia,
    "Times New Roman",
    serif;
  font-size: var(--large);
  font-weight: 500;
  line-height: 1.05;
  letter-spacing: 0;
}

h1 span {
  color: var(--burgundy);
}

.intro {
  max-width: 620px;
  padding: clamp(28px, 5vw, 42px) 0 clamp(26px, 5vw, 40px);
}

.intro p {
  margin: 0;
  font-size: var(--medium);
}

.intro p + p {
  margin-top: 8px;
  color: var(--muted);
  font-size: var(--body);
}

.portal-links {
  border-top: 1px solid var(--line);
}

.portal-link {
  display: grid;
  grid-template-columns: minmax(150px, 0.36fr) minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 20px;
  min-height: 68px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
  transition:
    color 160ms ease,
    padding-left 160ms ease,
    border-color 160ms ease;
}

.portal-link:hover {
  padding-left: 8px;
  border-bottom-color: var(--burgundy);
}

.portal-link:hover .link-name {
  text-decoration-color: var(--burgundy);
}

.portal-link:hover .link-arrow {
  transform: translateX(3px);
  opacity: 1;
}

.link-name {
  color: var(--burgundy);
  font-family:
    ui-monospace,
    "SFMono-Regular",
    Consolas,
    "Liberation Mono",
    monospace;
  font-size: var(--medium);
  font-weight: 650;
  text-decoration: underline;
  text-decoration-color: transparent;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.22em;
}

.link-desc {
  color: var(--text);
}

.link-arrow {
  color: var(--burgundy);
  opacity: 0.64;
  transition:
    transform 160ms ease,
    opacity 160ms ease;
}

.history {
  max-width: 620px;
  padding: clamp(34px, 6vw, 56px) 0;
}

.history h2 {
  margin: 0 0 10px;
  color: var(--burgundy);
  font-family:
    ui-monospace,
    "SFMono-Regular",
    Consolas,
    "Liberation Mono",
    monospace;
  font-size: var(--small);
  font-weight: 700;
}

.history p {
  margin: 0;
  color: var(--muted);
}

.site-footer {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: var(--small);
}

.site-footer span:first-child {
  color: var(--text);
}

.site-footer a {
  color: var(--burgundy);
  text-underline-offset: 0.24em;
}

.not-found {
  min-height: calc(100vh - 82px);
}

.not-found .intro {
  padding-bottom: clamp(36px, 7vw, 72px);
}

.home-link {
  display: inline-block;
  margin-top: 18px;
  color: var(--burgundy);
  text-underline-offset: 0.24em;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}

@media (max-width: 620px) {
  .site-shell {
    width: min(100% - 28px, 840px);
    padding-top: 36px;
  }

  .portal-link {
    grid-template-columns: 1fr auto;
    gap: 2px 16px;
    min-height: 76px;
    padding: 16px 0;
  }

  .link-name,
  .link-desc {
    grid-column: 1;
  }

  .link-arrow {
    grid-column: 2;
    grid-row: 1 / span 2;
    align-self: center;
  }
}