:root {
  color-scheme: light;
  --paper: #fffaf3;
  --paper-strong: #ffffff;
  --ink: #282331;
  --muted: #6d6677;
  --purple: #7841e8;
  --purple-soft: #f1eafb;
  --green: #3d9b70;
  --line: rgba(68, 51, 86, 0.14);
  --shadow: 0 22px 60px rgba(72, 48, 96, 0.10);
}

* { box-sizing: border-box; }

html { font-size: 17px; }

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 90% 0, rgba(120, 65, 232, 0.10), transparent 25rem),
    radial-gradient(circle at 0 28%, rgba(61, 155, 112, 0.08), transparent 24rem),
    var(--paper);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Noto Sans SC", sans-serif;
  line-height: 1.75;
  text-rendering: optimizeLegibility;
}

a { color: var(--purple); }
a:focus-visible { outline: 3px solid var(--purple); outline-offset: 4px; border-radius: 5px; }

.skip-link {
  position: fixed;
  left: 12px;
  top: 10px;
  z-index: 10;
  transform: translateY(-150%);
  padding: 10px 14px;
  color: #fff;
  background: var(--ink);
  border-radius: 10px;
}
.skip-link:focus { transform: none; }

.shell { width: min(calc(100% - 32px), 880px); margin: 0 auto; }

.site-header {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  border-bottom: 1px solid var(--line);
}

.brand { color: var(--ink); font-weight: 800; text-decoration: none; }
.brand span { color: var(--purple); }
.nav { display: flex; flex-wrap: wrap; gap: 18px; }
.nav a { color: var(--muted); font-size: 0.88rem; font-weight: 650; text-decoration: none; }
.nav a:hover { color: var(--purple); }

main { padding: clamp(48px, 9vw, 88px) 0 72px; }
.eyebrow { margin: 0 0 10px; color: var(--purple); font-size: 0.82rem; font-weight: 800; letter-spacing: 0.1em; }
h1 { margin: 0; font-size: clamp(2.3rem, 7vw, 4.2rem); line-height: 1.12; letter-spacing: -0.04em; }
.intro { max-width: 700px; margin: 22px 0 0; color: var(--muted); font-size: 1.08rem; }
.updated { margin: 14px 0 0; color: var(--muted); font-size: 0.86rem; }

.callout {
  margin: 34px 0;
  padding: 22px 24px;
  background: var(--purple-soft);
  border: 1px solid rgba(120, 65, 232, 0.17);
  border-radius: 20px;
}
.callout strong { color: var(--purple); }

.content {
  margin-top: 28px;
  padding: clamp(24px, 5vw, 48px);
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid rgba(255, 255, 255, 0.9);
  border-radius: 28px;
  box-shadow: var(--shadow);
}
h2 { margin: 2.3rem 0 0.55rem; font-size: 1.35rem; line-height: 1.4; }
h2:first-child { margin-top: 0; }
h3 { margin: 1.7rem 0 0.45rem; font-size: 1.05rem; }
p { margin: 0.6rem 0; }
ul, ol { margin: 0.6rem 0 0.9rem; padding-left: 1.35rem; }
li + li { margin-top: 0.35rem; }
.plain-list { list-style: none; padding: 0; }
.plain-list li { padding: 14px 0; border-bottom: 1px solid var(--line); }
.plain-list li:last-child { border-bottom: 0; }
.note { color: var(--muted); font-size: 0.9rem; }

.actions { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; margin-top: 30px; }
.button {
  min-height: 52px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 20px;
  color: #fff;
  background: var(--purple);
  border-radius: 999px;
  font-weight: 750;
  text-decoration: none;
}
.button.secondary { color: var(--purple); background: var(--purple-soft); }

.site-footer {
  padding: 26px 0 34px;
  color: var(--muted);
  border-top: 1px solid var(--line);
  font-size: 0.82rem;
  text-align: center;
}
.site-footer a { color: inherit; }

@media (max-width: 620px) {
  html { font-size: 16px; }
  .site-header { align-items: flex-start; flex-direction: column; padding: 18px 0; }
  .nav { gap: 14px; }
  main { padding-top: 42px; }
  .content { border-radius: 22px; }
  .actions { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; }
}