:root {
  --ink: #18211e;
  --paper: #f3f0e8;
  --acid: #c7f36b;
  --blue: #668fa3;
  --line: rgba(24, 33, 30, 0.16);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Hiragino Sans", "Yu Gothic", "Noto Sans JP", system-ui, sans-serif;
  line-height: 1.75;
}

a {
  color: inherit;
}

::selection {
  background: var(--acid);
}

.hub-shell {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  padding: clamp(2rem, 6vw, 5rem);
}

.hub-header {
  max-width: 780px;
  padding-top: 8vh;
}

.eyebrow,
.app-status {
  margin: 0 0 1rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.16em;
}

.hub-header h1 {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(4.5rem, 14vw, 10rem);
  font-weight: 400;
  letter-spacing: -0.07em;
  line-height: 0.9;
}

.hub-intro {
  max-width: 550px;
  margin: 2rem 0 0;
  font-size: clamp(1rem, 2vw, 1.25rem);
}

.app-grid {
  width: 100%;
  max-width: 1080px;
  margin-top: clamp(4rem, 12vw, 9rem);
}

.app-card {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: clamp(1rem, 3vw, 2rem);
  align-items: end;
  min-height: 250px;
  padding: clamp(1.5rem, 4vw, 3rem);
  border: 1px solid var(--ink);
  background:
    linear-gradient(128deg, transparent 54%, rgba(199, 243, 107, 0.38) 54%),
    repeating-linear-gradient(90deg, transparent 0 54px, var(--line) 55px),
    repeating-linear-gradient(0deg, transparent 0 54px, var(--line) 55px);
  color: inherit;
  text-decoration: none;
  transition: background-color 180ms ease, transform 180ms ease;
}

.app-card:hover,
.app-card:focus-visible {
  background-color: rgba(199, 243, 107, 0.28);
  transform: translateY(-4px);
}

.app-card:focus-visible {
  outline: 3px solid var(--blue);
  outline-offset: 4px;
}

.card-number,
.card-arrow {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.6rem;
}

.app-card h2 {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(2.6rem, 7vw, 5.6rem);
  font-weight: 400;
  letter-spacing: -0.055em;
  line-height: 0.95;
}

.app-card p:last-child {
  margin: 1.3rem 0 0;
}

.hub-footer {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  justify-content: space-between;
  margin-top: auto;
  padding-top: 5rem;
  font-size: 0.78rem;
}

.hub-footer a {
  text-underline-offset: 0.3em;
}

@media (prefers-reduced-motion: reduce) {
  .app-card {
    transition: none;
  }
}

@media (max-width: 560px) {
  .app-card {
    grid-template-columns: 1fr auto;
  }

  .card-number {
    display: none;
  }
}