:root {
  --bg: #f4f6f2;
  --panel: #ffffff;
  --panel-2: #e8ede4;
  --ink: #141814;
  --muted: #4a524a;
  --line: #c8d0c4;
  --line-strong: #8a9688;
  --accent: #0e8a3e;
  --accent-2: #1a5c8a;
  --accent-soft: #d4eddc;
  --code-bg: #1a1f1a;
  --code-ink: #eef2ea;
  --warn: #8b4d12;
  --radius: 8px;
  --space-1: 8px;
  --space-2: 12px;
  --space-3: 16px;
  --space-4: 24px;
  --space-5: 32px;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  background: var(--bg);
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--ink);
  font-size: 16px;
  line-height: 1.55;
}

a {
  color: var(--accent-2);
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

a:hover,
a:focus {
  color: var(--accent);
}

.layout {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  min-height: 100vh;
}

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  background: var(--panel-2);
  border-right: 2px solid var(--line);
  padding: var(--space-4);
}

.brand {
  display: grid;
  gap: var(--space-1);
  margin-bottom: var(--space-4);
}

.brand strong {
  font-size: 22px;
  line-height: 1.2;
}

.brand span,
.meta,
.small {
  color: var(--muted);
  font-size: 15px;
}

.nav {
  display: grid;
  gap: var(--space-1);
}

.nav a {
  display: block;
  padding: 10px 12px;
  border-radius: var(--radius);
  color: var(--ink);
  text-decoration: none;
}

.nav a[aria-current="page"],
.nav a:hover,
.nav a:focus {
  background: var(--panel);
  outline: 2px solid var(--line-strong);
  outline-offset: -2px;
}

.content {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: var(--space-5);
}

.topbar {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-4);
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  align-items: center;
}

button,
input[type="search"],
select {
  min-height: 44px;
  border: 2px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--panel);
  color: var(--ink);
  font: inherit;
  padding: 9px 12px;
}

button {
  cursor: pointer;
}

button:hover,
button:focus,
input[type="search"]:focus,
select:focus {
  outline: 3px solid #a8c4a8;
  outline-offset: 2px;
}

input[type="search"] {
  width: min(100%, 360px);
}

h1, h2, h3 {
  line-height: 1.2;
  margin: 0;
}

h1 {
  font-size: clamp(24px, 5vw, 28px);
  margin-bottom: var(--space-3);
}

h2 {
  font-size: 22px;
}

h3 {
  font-size: 18px;
}

p {
  margin: 0 0 var(--space-3);
}

.lead {
  font-size: 18px;
  max-width: 78ch;
}

.section {
  margin: 0 0 var(--space-5);
}

.panel,
details,
.flow-step,
.table-wrap,
.arch-node,
.demo-panel {
  background: var(--panel);
  border: 2px solid var(--line);
  border-radius: var(--radius);
}

.panel {
  padding: var(--space-4);
}

.grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-3);
}

.grid.three {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.stack {
  display: grid;
  gap: var(--space-3);
}

.flow {
  display: grid;
  gap: var(--space-3);
}

.flow-step {
  display: grid;
  gap: var(--space-2);
  padding: var(--space-3);
  text-align: left;
  width: 100%;
  cursor: pointer;
  font: inherit;
  color: inherit;
}

.flow-step.is-active,
.flow-step:hover,
.flow-step:focus {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.step-label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--accent);
  font-weight: 700;
}

.badge {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  border-radius: 999px;
  background: var(--panel-2);
  color: var(--ink);
  padding: 3px 10px;
  font-size: 14px;
  white-space: nowrap;
}

.badge-mandatory {
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 600;
}

details {
  padding: 0;
  overflow: hidden;
}

details.is-active {
  border-color: var(--accent);
}

summary {
  cursor: pointer;
  display: flex;
  gap: var(--space-2);
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-4);
  font-weight: 700;
}

summary::marker {
  color: var(--accent);
}

.details-body {
  border-top: 2px solid var(--line);
  padding: var(--space-4);
}

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

pre {
  margin: var(--space-3) 0 0;
  overflow-x: auto;
  white-space: pre;
  background: var(--code-bg);
  color: var(--code-ink);
  border-radius: var(--radius);
  padding: var(--space-3);
  font-size: 14px;
  line-height: 1.55;
  -webkit-overflow-scrolling: touch;
}

code {
  white-space: pre-wrap;
  word-break: break-word;
}

p code, li code, td code, summary code {
  background: var(--panel-2);
  color: var(--ink);
  border-radius: 4px;
  padding: 1px 4px;
  white-space: nowrap;
}

ul, ol {
  margin: 0;
  padding-left: 22px;
}

li + li {
  margin-top: var(--space-1);
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 640px;
}

th, td {
  text-align: left;
  vertical-align: top;
  padding: var(--space-2);
  border-bottom: 2px solid var(--line);
}

th {
  background: var(--panel-2);
}

.table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.callout {
  border-left: 6px solid var(--accent);
  padding: var(--space-3);
  background: var(--accent-soft);
  border-radius: var(--radius);
}

.callout-warn {
  border-left-color: var(--warn);
  background: #f5ebe0;
}

.coderef {
  margin-top: var(--space-3);
  font-size: 15px;
}

.coderef a {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  word-break: break-all;
}

.hidden {
  display: none !important;
}

.footer {
  margin-top: var(--space-5);
  padding-top: var(--space-4);
  border-top: 2px solid var(--line);
  color: var(--muted);
}

/* Interactive architecture map */
.arch-map {
  display: grid;
  gap: var(--space-3);
}

.arch-row {
  display: grid;
  gap: var(--space-2);
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
}

.arch-node {
  padding: var(--space-3);
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
  min-height: 72px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
}

.arch-node strong {
  font-size: 15px;
  color: var(--accent-2);
}

.arch-node span {
  font-size: 13px;
  color: var(--muted);
}

.arch-node.is-active,
.arch-node:hover,
.arch-node:focus {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.arch-detail {
  padding: var(--space-4);
  min-height: 120px;
}

.arch-detail h3 {
  margin-bottom: var(--space-2);
  color: var(--accent);
}

/* Canvas demo */
.demo-panel {
  padding: var(--space-4);
}

.demo-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}

.demo-canvas-wrap {
  position: relative;
  width: 100%;
  max-width: 480px;
  margin: 0 auto;
  aspect-ratio: 16 / 10;
  background: #245324;
  border-radius: var(--radius);
  overflow: hidden;
  border: 2px solid var(--line-strong);
}

.demo-canvas-wrap canvas {
  display: block;
  width: 100%;
  height: 100%;
}

.demo-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: var(--space-2);
  margin-top: var(--space-3);
}

.stat-box {
  background: var(--panel-2);
  border-radius: var(--radius);
  padding: var(--space-2);
  text-align: center;
}

.stat-box strong {
  display: block;
  font-size: 22px;
  color: var(--accent);
}

.stat-box span {
  font-size: 13px;
  color: var(--muted);
}

/* Platform picker */
.platform-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--space-2);
}

.platform-card {
  padding: var(--space-3);
  border: 2px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  cursor: pointer;
  text-align: left;
  font: inherit;
  color: inherit;
  min-height: 44px;
}

.platform-card.is-active,
.platform-card:hover,
.platform-card:focus {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.platform-card code {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  white-space: normal;
}

@media (max-width: 860px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
    height: auto;
    border-right: 0;
    border-bottom: 2px solid var(--line);
    padding: var(--space-3);
  }

  .nav {
    display: flex;
    flex-wrap: wrap;
    overflow-x: auto;
    padding-bottom: var(--space-1);
    -webkit-overflow-scrolling: touch;
  }

  .nav a {
    flex: 0 0 auto;
    white-space: nowrap;
  }

  .content {
    padding: var(--space-4) var(--space-3);
  }

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

  .topbar {
    align-items: stretch;
  }

  .controls,
  input[type="search"],
  button,
  select {
    width: 100%;
  }

  .demo-toolbar button {
    flex: 1 1 auto;
  }
}