:root {
  color-scheme: light;
  --bg: #f7f8f5;
  --panel: #ffffff;
  --panel-2: #eef4f1;
  --ink: #18211f;
  --muted: #5d6a66;
  --line: #d8e0dc;
  --accent: #1f7668;
  --accent-2: #b84835;
  --code-bg: #fbfbf7;
  --shadow: 0 12px 30px rgba(30, 42, 38, 0.08);
}

* {
  box-sizing: border-box;
}

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

a {
  color: var(--accent);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.2em;
}

.shell {
  min-height: 100vh;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px clamp(16px, 4vw, 44px);
  background: rgba(247, 248, 245, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
}

.brand {
  display: grid;
  gap: 2px;
}

.brand strong {
  font-size: 0.98rem;
}

.brand span {
  color: var(--muted);
  font-size: 0.8rem;
}

.topbar nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 6px;
}

.topbar nav a,
.control {
  display: inline-flex;
  min-height: 36px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 7px 10px;
  background: var(--panel);
  color: var(--ink);
  font-size: 0.84rem;
  text-decoration: none;
}

.topbar nav a[aria-current="page"] {
  border-color: rgba(31, 118, 104, 0.55);
  background: #e4f2ee;
  color: #0d554c;
}

.hero {
  padding: clamp(28px, 7vw, 70px) clamp(16px, 5vw, 72px) 26px;
  border-bottom: 1px solid var(--line);
  background:
    linear-gradient(120deg, rgba(31, 118, 104, 0.14), transparent 50%),
    linear-gradient(280deg, rgba(184, 72, 53, 0.12), transparent 45%);
}

.hero h1 {
  max-width: 980px;
  margin: 0;
  font-size: clamp(2rem, 7vw, 5.2rem);
  line-height: 0.96;
  letter-spacing: 0;
}

.hero p {
  max-width: 850px;
  margin: 18px 0 0;
  color: var(--muted);
  font-size: clamp(1rem, 2vw, 1.2rem);
}

.layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 290px;
  gap: 30px;
  width: min(1280px, 100%);
  margin: 0 auto;
  padding: 30px clamp(16px, 4vw, 42px) 64px;
}

main {
  min-width: 0;
}

.side {
  position: sticky;
  top: 86px;
  align-self: start;
  display: grid;
  gap: 14px;
}

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

.panel {
  padding: 18px;
}

.panel h2,
.panel h3 {
  margin: 0 0 10px;
  font-size: 1rem;
}

.panel p,
.panel li {
  color: var(--muted);
}

.panel ul {
  margin: 10px 0 0;
  padding-left: 18px;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}

details.flow {
  margin: 0 0 16px;
  overflow: clip;
}

details.flow summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 16px 18px;
  border-bottom: 1px solid var(--line);
  background: var(--panel-2);
}

details.flow summary::-webkit-details-marker {
  display: none;
}

.summary-title {
  display: grid;
  gap: 2px;
}

.summary-title strong {
  font-size: 1.05rem;
}

.summary-title span {
  color: var(--muted);
  font-size: 0.86rem;
}

.chevron {
  flex: 0 0 auto;
  width: 28px;
  height: 28px;
  border: 1px solid var(--line);
  border-radius: 999px;
  display: grid;
  place-items: center;
  background: var(--panel);
}

.chevron::before {
  content: "";
  width: 8px;
  height: 8px;
  border-right: 2px solid var(--accent);
  border-bottom: 2px solid var(--accent);
  transform: rotate(45deg) translate(-1px, -1px);
}

details[open] .chevron::before {
  transform: rotate(225deg) translate(-1px, -1px);
}

.content {
  padding: 18px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.step,
.note {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px;
  background: #fff;
}

.step h3,
.note h3 {
  margin: 0 0 8px;
  font-size: 0.98rem;
}

.step p,
.note p {
  margin: 0;
  color: var(--muted);
}

.flowline {
  display: grid;
  grid-template-columns: repeat(5, minmax(120px, 1fr));
  gap: 10px;
  margin: 14px 0;
  overflow-x: auto;
  padding-bottom: 6px;
}

.node {
  min-height: 96px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px;
  background: #fff;
}

.node b {
  display: block;
  margin-bottom: 5px;
  color: #102724;
}

.node small {
  color: var(--muted);
}

.tag {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  border-radius: 999px;
  padding: 2px 8px;
  background: #e6f0ec;
  color: #0f5c52;
  font-size: 0.76rem;
  font-weight: 650;
}

pre,
code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}

pre {
  white-space: pre;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  margin: 12px 0 0;
  padding: 14px;
  background: var(--code-bg);
  color: #1f2523;
  font-size: 0.88rem;
}

.refs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

.refs a {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 5px 9px;
  background: #fff;
  font-size: 0.82rem;
  text-decoration: none;
}

.toc a {
  display: block;
  padding: 8px 0;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  text-decoration: none;
}

.toc a:last-child {
  border-bottom: 0;
}

.toc a:hover {
  color: var(--accent);
}

.callout {
  border-left: 4px solid var(--accent-2);
  padding: 10px 14px;
  background: #fff6f1;
  color: #5b352d;
}

@media (max-width: 880px) {
  .topbar {
    align-items: stretch;
    flex-direction: column;
  }

  .topbar nav {
    justify-content: flex-start;
    overflow-x: auto;
    flex-wrap: nowrap;
    padding-bottom: 2px;
  }

  .layout {
    grid-template-columns: 1fr;
  }

  .side {
    position: static;
    order: -1;
  }

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

@media (max-width: 560px) {
  .hero {
    padding-top: 24px;
  }

  details.flow summary,
  .content,
  .panel {
    padding: 14px;
  }

  .topbar nav a,
  .control {
    min-height: 34px;
    font-size: 0.8rem;
    white-space: nowrap;
  }
}