:root {
  --bg: #f6f2e8;
  --ink: #1b1d22;
  --muted: #5e646d;
  --card: #ffffff;
  --line: #dfd7c7;
  --accent: #c26f2f;
  --max: 980px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 85% 10%, rgba(194, 111, 47, 0.12), transparent 35%),
    radial-gradient(circle at 15% 20%, rgba(27, 29, 34, 0.06), transparent 28%),
    var(--bg);
  font-family: "IBM Plex Sans JP", "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
}

a {
  color: inherit;
}

.container {
  width: min(100%, var(--max));
  margin: 0 auto;
  padding: 0 20px;
}

.topbar {
  border-bottom: 1px solid var(--line);
  background: rgba(246, 242, 232, 0.9);
  backdrop-filter: blur(2px);
}

.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
}

.logo {
  width: 122px;
}

.top-links {
  display: flex;
  gap: 16px;
  font-size: 13px;
  font-weight: 600;
}

.hero {
  padding: 52px 0 28px;
}

.hero h1 {
  margin: 0;
  font-size: clamp(28px, 4.4vw, 44px);
  line-height: 1.1;
}

.hero p {
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.75;
}

.badge {
  display: inline-block;
  margin-top: 18px;
  border: 1px solid rgba(194, 111, 47, 0.32);
  background: rgba(194, 111, 47, 0.1);
  color: #7d461b;
  border-radius: 999px;
  padding: 6px 12px;
  font-size: 12px;
  font-weight: 700;
}

.grid {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  gap: 20px;
  padding-bottom: 48px;
}

.toc {
  position: sticky;
  top: 16px;
  align-self: start;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 14px;
}

.toc h2 {
  margin: 0 0 10px;
  font-size: 13px;
}

.toc a {
  display: block;
  padding: 7px 4px;
  font-size: 13px;
  text-decoration: none;
  color: #2e333b;
}

.content {
  display: grid;
  gap: 16px;
}

.section {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 20px;
}

.section h3 {
  margin: 0 0 12px;
  font-size: 20px;
}

.section p,
.section li {
  color: #2f3540;
  font-size: 14px;
  line-height: 1.75;
}

.endpoint {
  margin: 12px 0;
  border: 1px solid #e6dcc9;
  background: #fcf8f0;
  border-radius: 12px;
  padding: 10px 12px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  font-size: 13px;
}

pre {
  margin: 12px 0 0;
  background: #14161b;
  color: #edf0f7;
  border-radius: 12px;
  padding: 12px;
  overflow-x: auto;
  font-size: 12px;
  line-height: 1.6;
}

.footer {
  border-top: 1px solid var(--line);
  padding: 20px 0 32px;
  color: var(--muted);
  font-size: 12px;
}

@media (max-width: 900px) {
  .grid {
    grid-template-columns: 1fr;
  }
  .toc {
    position: static;
  }
}