:root {
  --coral: #ff6b6b;
  --coral-deep: #e85d5d;
  --orange: #ff8e53;
  --ink: #1e293b;
  --muted: #64748b;
  --line: #e2e8f0;
  --paper: #f8fafc;
  --white: #ffffff;
  --notice: #fff7ed;
  --notice-ink: #9a3412;
  --radius: 16px;
  --max: 720px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  font-size: 17px;
  line-height: 1.65;
}

a {
  color: var(--coral-deep);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover {
  color: var(--ink);
}

.topbar {
  height: 4px;
  background: linear-gradient(90deg, var(--coral), var(--orange));
}

.wrap {
  width: min(var(--max), calc(100% - 40px));
  margin: 0 auto;
}

header.site {
  padding: 28px 0 8px;
  display: flex;
  align-items: center;
  gap: 12px;
}

header.site img {
  width: 44px;
  height: 44px;
  border-radius: 12px;
}

header.site .brand {
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
  color: var(--ink);
  text-decoration: none;
}

nav.links {
  margin-left: auto;
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  font-size: 0.9rem;
}

.hero {
  padding: 36px 0 12px;
}

.hero h1 {
  margin: 0 0 10px;
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  letter-spacing: -0.03em;
  line-height: 1.2;
}

.lede {
  color: var(--muted);
  font-size: 1.05rem;
  max-width: 40rem;
}

.notice {
  margin: 20px 0 28px;
  padding: 14px 16px;
  background: var(--notice);
  color: var(--notice-ink);
  border-radius: 12px;
  font-size: 0.95rem;
}

.meta {
  color: var(--muted);
  font-size: 0.9rem;
  margin-bottom: 28px;
}

main.prose h2 {
  margin: 2rem 0 0.6rem;
  font-size: 1.2rem;
  letter-spacing: -0.02em;
}

main.prose p,
main.prose ul {
  margin: 0 0 1rem;
}

main.prose ul {
  padding-left: 1.2rem;
}

main.prose li + li {
  margin-top: 0.35rem;
}

.cards {
  display: grid;
  gap: 14px;
  margin: 28px 0 40px;
}

.card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 22px;
  text-decoration: none;
  color: inherit;
  display: block;
}

.card:hover {
  border-color: #fecaca;
}

.card h2 {
  margin: 0 0 6px;
  font-size: 1.05rem;
}

.card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.cta {
  display: inline-block;
  margin-top: 8px;
  padding: 12px 18px;
  border-radius: 12px;
  background: linear-gradient(90deg, var(--coral), var(--orange));
  color: var(--white);
  text-decoration: none;
  font-weight: 600;
}

.cta:hover {
  color: var(--white);
  filter: brightness(0.97);
}

footer.site {
  margin-top: 56px;
  padding: 28px 0 40px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.9rem;
}

footer.site nav {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 16px;
  margin-bottom: 10px;
}

.todo {
  background: #fef2f2;
  border-radius: 8px;
  padding: 2px 6px;
  font-family: ui-monospace, monospace;
  font-size: 0.85em;
}

@media (max-width: 640px) {
  nav.links {
    display: none;
  }

  body {
    font-size: 16px;
  }
}