:root {
  color-scheme: light;
  --bg: #f6f8fb;
  --panel: #ffffff;
  --ink: #172033;
  --muted: #5f6f86;
  --line: #d9e1ee;
  --accent: #0077cc;
  --accent-2: #0b8f63;
  --accent-3: #b35300;
  --code-bg: #fbfcff;
  --shadow: 0 8px 28px rgba(24, 42, 70, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font: 16px/1.55 system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}

.shell {
  min-height: 100vh;
}

header {
  background: #ffffff;
  border-bottom: 1px solid var(--line);
}

.header-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 24px 20px 16px;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--accent-2);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1 {
  max-width: 880px;
  margin: 0;
  font-size: clamp(2rem, 6vw, 3.6rem);
  line-height: 1.02;
  letter-spacing: 0;
}

.lede {
  max-width: 900px;
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 1.08rem;
}

nav {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 20px 18px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

nav a {
  flex: 0 0 auto;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 8px 11px;
  background: #fff;
  color: var(--ink);
  font-size: 0.9rem;
  text-decoration: none;
}

nav a.active {
  border-color: var(--accent);
  color: #ffffff;
  background: var(--accent);
}

main {
  max-width: 1180px;
  margin: 0 auto;
  padding: 20px;
}

.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  margin: 0 0 18px;
}

button {
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 8px 12px;
  background: #fff;
  color: var(--ink);
  cursor: pointer;
  font: inherit;
}

button:hover {
  border-color: var(--accent);
}

.grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 16px;
}

.span-12 {
  grid-column: span 12;
}

.span-8 {
  grid-column: span 8;
}

.span-6 {
  grid-column: span 6;
}

.span-4 {
  grid-column: span 4;
}

.panel,
details {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.panel {
  padding: 18px;
}

details {
  overflow: clip;
}

summary {
  padding: 15px 18px;
  cursor: pointer;
  font-weight: 700;
}

details > .body {
  padding: 0 18px 18px;
}

h2,
h3 {
  margin: 0 0 10px;
  line-height: 1.2;
  letter-spacing: 0;
}

h2 {
  font-size: 1.35rem;
}

h3 {
  font-size: 1.05rem;
}

p {
  margin: 0 0 12px;
}

ul,
ol {
  margin: 0 0 12px 1.2rem;
  padding: 0;
}

li + li {
  margin-top: 6px;
}

.flow {
  display: grid;
  grid-template-columns: repeat(6, minmax(145px, 1fr));
  gap: 10px;
  overflow-x: auto;
  padding: 4px 0 8px;
}

.flow-step {
  min-height: 124px;
  border: 1px solid var(--line);
  border-left: 4px solid var(--accent);
  border-radius: 8px;
  background: #fff;
  padding: 12px;
}

.flow-step strong {
  display: block;
  margin-bottom: 6px;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 8px 0 12px;
}

.tag {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 3px 8px;
  background: #f9fbfe;
  color: var(--muted);
  font-size: 0.82rem;
}

.ref-list {
  display: grid;
  gap: 8px;
}

.ref-list a {
  word-break: break-word;
}

code {
  background: #eef4fb;
  border-radius: 4px;
  padding: 0 4px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.93em;
}

pre {
  margin: 12px 0 0;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 12px;
  background: var(--code-bg);
  white-space: pre;
}

pre code {
  display: block;
  min-width: max-content;
  padding: 0;
  background: transparent;
  white-space: pre;
}

.callout {
  border-left: 4px solid var(--accent-3);
  padding: 12px 14px;
  background: #fff8ef;
  border-radius: 6px;
}

.two-col {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 14px;
}

.footer {
  max-width: 1180px;
  margin: 0 auto;
  padding: 24px 20px 40px;
  color: var(--muted);
  font-size: 0.92rem;
}

@media (max-width: 860px) {
  .grid {
    display: block;
  }

  .grid > * {
    margin-bottom: 14px;
  }

  .two-col {
    grid-template-columns: 1fr;
  }

  .flow {
    grid-template-columns: repeat(6, 78vw);
  }

  main {
    padding: 16px;
  }
}

@media (max-width: 540px) {
  .header-inner {
    padding: 20px 16px 14px;
  }

  nav {
    padding: 0 16px 14px;
  }

  summary {
    padding: 14px 15px;
  }

  details > .body,
  .panel {
    padding: 15px;
  }
}