:root {
  --bg-top: #f5f0e5;
  --bg-bottom: #ece4d5;
  --ink: #132139;
  --ink-soft: #48607a;
  --paper: rgba(255, 252, 246, 0.84);
  --paper-strong: rgba(255, 252, 246, 0.95);
  --line: rgba(19, 33, 57, 0.09);
  --accent-a: #d4573f;
  --accent-b: #0c7a80;
  --accent-c: #d8992c;
  --shadow: 0 28px 56px rgba(18, 29, 46, 0.12);
  --font-body: "Noto Sans JP", "Hiragino Sans", "Yu Gothic", sans-serif;
  --font-display: "M PLUS 1p", "Noto Sans JP", "Hiragino Sans", "Yu Gothic", sans-serif;
  --font-mono: "IBM Plex Mono", Consolas, monospace;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: var(--font-body);
  background:
    radial-gradient(circle at 14% 16%, rgba(212, 87, 63, 0.18), transparent 24%),
    radial-gradient(circle at 84% 14%, rgba(12, 122, 128, 0.17), transparent 24%),
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px),
    linear-gradient(180deg, var(--bg-top), var(--bg-bottom));
  background-size: auto, auto, 30px 30px, 30px 30px, auto;
}

a {
  color: inherit;
  text-decoration: none;
}

.shell {
  width: min(1180px, calc(100vw - 48px));
  margin: 0 auto;
  padding: 48px 0 64px;
}

.hero {
  padding: 40px 42px;
  border-radius: 34px;
  background:
    radial-gradient(circle at top right, rgba(216, 153, 44, 0.2), transparent 28%),
    linear-gradient(135deg, rgba(255, 255, 255, 0.72), rgba(255, 255, 255, 0.32)),
    var(--paper-strong);
  box-shadow: var(--shadow);
}

.eyebrow,
.card-eyebrow {
  margin: 0 0 14px;
  color: var(--accent-b);
  font-family: var(--font-display);
  font-size: 0.92rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2 {
  margin: 0;
  font-family: var(--font-display);
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(2.8rem, 5vw, 4.6rem);
}

h2 {
  font-size: 1.45rem;
}

.lead {
  max-width: 52ch;
  margin: 18px 0 0;
  color: var(--ink-soft);
  line-height: 1.74;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 24px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 18px;
  border-radius: 999px;
  background: rgba(19, 33, 57, 0.08);
  font-weight: 700;
}

.button.primary {
  background: rgba(12, 122, 128, 0.12);
  color: var(--accent-b);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px;
  margin-top: 22px;
}

.card {
  padding: 24px 24px 22px;
  border-radius: 28px;
  background: rgba(255, 255, 255, 0.68);
  border: 1px solid rgba(19, 33, 57, 0.08);
  box-shadow: 0 18px 36px rgba(18, 29, 46, 0.08);
}

.card.featured {
  background:
    radial-gradient(circle at top right, rgba(12, 122, 128, 0.14), transparent 28%),
    rgba(255, 255, 255, 0.74);
}

.card p {
  margin: 14px 0 0;
  line-height: 1.7;
  color: var(--ink-soft);
}

.card-link {
  display: inline-flex;
  margin-top: 18px;
  padding: 10px 14px;
  border-radius: 999px;
  background: rgba(19, 33, 57, 0.08);
  font-family: var(--font-mono);
  font-size: 0.95rem;
}

@media (max-width: 720px) {
  .shell {
    width: min(100vw - 28px, 1180px);
    padding-top: 28px;
  }

  .hero {
    padding: 28px 24px;
  }
}