:root {
  color-scheme: light dark;
  --bg: #f6f5fb;
  --surface: #ffffff;
  --text: #1a1a22;
  --muted: #5c5c6e;
  --accent: #4b3fbf;
  --accent-soft: #ebe8ff;
  --border: #e2e0ef;
  --link: #3b2f9b;
  --radius: 14px;
  --shadow: 0 8px 28px rgba(40, 30, 90, 0.08);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12121a;
    --surface: #1c1c28;
    --text: #f2f1f8;
    --muted: #a8a6b8;
    --accent: #a99dff;
    --accent-soft: #2a2740;
    --border: #2e2e40;
    --link: #c4bbff;
    --shadow: 0 10px 32px rgba(0, 0, 0, 0.35);
  }
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN",
    "Segoe UI", sans-serif;
  line-height: 1.7;
  color: var(--text);
  background:
    radial-gradient(ellipse 80% 50% at 10% -10%, rgba(90, 70, 200, 0.18), transparent 55%),
    radial-gradient(ellipse 60% 40% at 100% 0%, rgba(20, 140, 150, 0.12), transparent 50%),
    var(--bg);
}

a {
  color: var(--link);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.15em;
}

a:hover {
  text-decoration-thickness: 2px;
}

.wrap {
  max-width: 42rem;
  margin: 0 auto;
  padding: 1.25rem 1.25rem 3.5rem;
}

.site-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 1rem;
  margin-bottom: 1.75rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  color: inherit;
  text-decoration: none;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.brand:hover {
  text-decoration: none;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 2rem;
  height: 2rem;
  border-radius: 0.55rem;
  background: linear-gradient(145deg, #5b4fd6, #3b2f9b);
  color: #fff;
  font-size: 0.72rem;
  font-weight: 700;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.9rem;
  font-size: 0.92rem;
}

.nav a {
  color: var(--muted);
  text-decoration: none;
}

.nav a:hover,
.nav a[aria-current="page"] {
  color: var(--link);
  text-decoration: underline;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.5rem 1.35rem 1.75rem;
}

@media (min-width: 480px) {
  .card {
    padding: 1.85rem 1.75rem 2rem;
  }
}

h1 {
  margin: 0 0 0.35rem;
  font-size: 1.55rem;
  line-height: 1.3;
  letter-spacing: -0.02em;
}

h2 {
  margin: 1.85rem 0 0.55rem;
  font-size: 1.08rem;
  line-height: 1.35;
}

h3 {
  margin: 1.25rem 0 0.35rem;
  font-size: 1rem;
}

p {
  margin: 0.55rem 0;
}

.meta {
  margin: 0 0 1.25rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.lead {
  font-size: 1.02rem;
}

ul {
  margin: 0.5rem 0 0.75rem;
  padding-left: 1.25rem;
}

li + li {
  margin-top: 0.35rem;
}

.pill-list {
  list-style: none;
  padding: 0;
  margin: 1rem 0 0;
  display: grid;
  gap: 0.65rem;
}

.pill-list li {
  margin: 0;
  padding: 0.85rem 1rem;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--accent-soft);
}

.pill-list a {
  font-weight: 600;
  text-decoration: none;
}

.pill-list a:hover {
  text-decoration: underline;
}

.pill-list p {
  margin: 0.25rem 0 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.note {
  margin-top: 1.25rem;
  padding: 0.85rem 1rem;
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
  border-radius: 0 10px 10px 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.site-footer {
  margin-top: 2rem;
  color: var(--muted);
  font-size: 0.85rem;
}

.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  margin-bottom: 0.5rem;
}