/* Custom Diagram Creator documentation site. Plain CSS, no build step. */

:root {
  --bg: #ffffff;
  --bg-soft: #f6f7fb;
  --surface: #ffffff;
  --border: #e4e6ee;
  --border-strong: #d2d6e2;
  --text: #171a26;
  --text-soft: #5a6074;
  --accent: #3555f5;
  --accent-strong: #2440d8;
  --accent-soft: #eef1ff;
  --ok: #00a46c;
  --ok-soft: #e6f7f0;
  --warn: #d79a00;
  --warn-soft: #fdf5e1;
  --bad: #d4183d;
  --bad-soft: #fdecef;
  --unknown: #8a8fa3;
  --unknown-soft: #f0f1f5;
  --code-bg: #f3f4f9;
  --canvas-dot: #d6d9e4;
  --shadow-sm: 0 1px 2px rgba(16, 24, 40, 0.06);
  --shadow: 0 1px 2px rgba(16, 24, 40, 0.05), 0 12px 32px -12px rgba(16, 24, 40, 0.18);
  --radius: 14px;
  --radius-sm: 8px;
  --ease-out: cubic-bezier(0.23, 1, 0.32, 1);
  --font: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0d0f16;
    --bg-soft: #131622;
    --surface: #161a27;
    --border: #252a3b;
    --border-strong: #333a50;
    --text: #e9ebf3;
    --text-soft: #9aa1b8;
    --accent: #7d93ff;
    --accent-strong: #9aabff;
    --accent-soft: rgba(125, 147, 255, 0.12);
    --ok: #22c38a;
    --ok-soft: rgba(34, 195, 138, 0.12);
    --warn: #f0b72f;
    --warn-soft: rgba(240, 183, 47, 0.12);
    --bad: #ff5a76;
    --bad-soft: rgba(255, 90, 118, 0.12);
    --unknown: #8a90a8;
    --unknown-soft: rgba(138, 144, 168, 0.12);
    --code-bg: #10131c;
    --canvas-dot: #2a3044;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 16px 40px -16px rgba(0, 0, 0, 0.7);
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --bg: #0d0f16;
  --bg-soft: #131622;
  --surface: #161a27;
  --border: #252a3b;
  --border-strong: #333a50;
  --text: #e9ebf3;
  --text-soft: #9aa1b8;
  --accent: #7d93ff;
  --accent-strong: #9aabff;
  --accent-soft: rgba(125, 147, 255, 0.12);
  --ok: #22c38a;
  --ok-soft: rgba(34, 195, 138, 0.12);
  --warn: #f0b72f;
  --warn-soft: rgba(240, 183, 47, 0.12);
  --bad: #ff5a76;
  --bad-soft: rgba(255, 90, 118, 0.12);
  --unknown: #8a90a8;
  --unknown-soft: rgba(138, 144, 168, 0.12);
  --code-bg: #10131c;
  --canvas-dot: #2a3044;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 16px 40px -16px rgba(0, 0, 0, 0.7);
  color-scheme: dark;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: 80px;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--accent);
  text-decoration: none;
  text-underline-offset: 3px;
}

a:hover {
  text-decoration: underline;
}

img,
svg {
  max-width: 100%;
}

code,
pre,
kbd {
  font-family: var(--mono);
  font-size: 0.88em;
}

:not(pre) > code {
  padding: 0.12em 0.4em;
  border-radius: 6px;
  background: var(--code-bg);
  border: 1px solid var(--border);
  word-break: break-word;
}

kbd {
  padding: 0.1em 0.45em;
  border-radius: 6px;
  border: 1px solid var(--border-strong);
  border-bottom-width: 2px;
  background: var(--surface);
  font-size: 0.8em;
}

.skip-link {
  position: absolute;
  left: -9999px;
}

.skip-link:focus {
  left: 16px;
  top: 12px;
  z-index: 100;
  padding: 8px 12px;
  background: var(--surface);
  border-radius: var(--radius-sm);
}

/* ---------- top bar ---------- */

.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  gap: 24px;
  height: 64px;
  padding: 0 24px;
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter: saturate(160%) blur(12px);
  -webkit-backdrop-filter: saturate(160%) blur(12px);
  border-bottom: 1px solid var(--border);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-weight: 650;
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.brand:hover {
  text-decoration: none;
}

.brand-mark {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
}

.topnav {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
}

.topnav a {
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  color: var(--text-soft);
  font-size: 14px;
  font-weight: 500;
}

.topnav a:hover {
  color: var(--text);
  background: var(--bg-soft);
  text-decoration: none;
}

.topnav a[aria-current="page"] {
  color: var(--text);
  background: var(--bg-soft);
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-soft);
  cursor: pointer;
  transition: transform 160ms var(--ease-out), color 160ms ease;
}

.icon-btn:hover {
  color: var(--text);
}

.icon-btn:active {
  transform: scale(0.96);
}

.menu-btn {
  display: none;
}

/* ---------- buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: 10px;
  border: 1px solid var(--border-strong);
  background: var(--surface);
  color: var(--text);
  font-weight: 600;
  font-size: 15px;
  transition: transform 160ms var(--ease-out), background-color 160ms ease, border-color 160ms ease;
}

.btn:hover {
  text-decoration: none;
  border-color: var(--text-soft);
}

.btn:active {
  transform: scale(0.97);
}

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.btn-primary:hover {
  background: var(--accent-strong);
  border-color: var(--accent-strong);
}

/* ---------- home ---------- */

.hero {
  position: relative;
  overflow: hidden;
  padding: 72px 24px 56px;
  border-bottom: 1px solid var(--border);
  background:
    radial-gradient(1200px 400px at 85% -10%, var(--accent-soft), transparent 70%),
    radial-gradient(800px 300px at -10% 110%, var(--ok-soft), transparent 70%);
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
  gap: 48px;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
  padding: 4px 12px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-soft);
  font-size: 13px;
  font-weight: 500;
}

.eyebrow .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--ok);
}

.hero h1 {
  margin: 0 0 18px;
  font-size: clamp(36px, 5vw, 56px);
  line-height: 1.06;
  letter-spacing: -0.035em;
  font-weight: 750;
}

.hero h1 .accent {
  background: linear-gradient(92deg, var(--accent), #9b5cff 55%, var(--ok));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero p.lead {
  margin: 0 0 28px;
  max-width: 34em;
  color: var(--text-soft);
  font-size: 18px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.hero-meta {
  margin-top: 20px;
  color: var(--text-soft);
  font-size: 13px;
}

.canvas-card {
  position: relative;
  border-radius: 18px;
  border: 1px solid var(--border);
  background-color: var(--surface);
  background-image: radial-gradient(var(--canvas-dot) 1.2px, transparent 1.2px);
  background-size: 18px 18px;
  box-shadow: var(--shadow);
  overflow: hidden;
}

.canvas-chrome {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  font-size: 12px;
  color: var(--text-soft);
}

.canvas-chrome .pill {
  padding: 2px 8px;
  border-radius: 6px;
  background: var(--bg-soft);
  border: 1px solid var(--border);
}

.canvas-chrome .spacer {
  flex: 1;
}

.section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 72px 24px;
}

.section-head {
  max-width: 640px;
  margin-bottom: 36px;
}

.section-head h2 {
  margin: 0 0 10px;
  font-size: 32px;
  line-height: 1.15;
  letter-spacing: -0.025em;
}

.section-head p {
  margin: 0;
  color: var(--text-soft);
  font-size: 17px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.card {
  padding: 22px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
}

.card h3 {
  margin: 14px 0 6px;
  font-size: 17px;
  letter-spacing: -0.01em;
}

.card p {
  margin: 0;
  color: var(--text-soft);
  font-size: 15px;
}

.card-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: var(--accent-soft);
  color: var(--accent);
}

.status-row {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.status-card {
  padding: 18px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  border-left-width: 5px;
  background: var(--surface);
}

.status-card strong {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 4px;
}

.status-card p {
  margin: 0;
  color: var(--text-soft);
  font-size: 14px;
}

.status-card.ok {
  border-left-color: var(--ok);
  background: linear-gradient(90deg, var(--ok-soft), var(--surface) 60%);
}

.status-card.warn {
  border-left-color: var(--warn);
  background: linear-gradient(90deg, var(--warn-soft), var(--surface) 60%);
}

.status-card.bad {
  border-left-color: var(--bad);
  background: linear-gradient(90deg, var(--bad-soft), var(--surface) 60%);
}

.status-card.unknown {
  border-left-color: var(--unknown);
  background: linear-gradient(90deg, var(--unknown-soft), var(--surface) 60%);
}

.steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  counter-reset: step;
}

.step {
  position: relative;
  padding: 22px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
}

.step::before {
  counter-increment: step;
  content: counter(step);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  margin-bottom: 12px;
  border-radius: 50%;
  background: var(--text);
  color: var(--bg);
  font-size: 14px;
  font-weight: 700;
}

.step h3 {
  margin: 0 0 6px;
  font-size: 17px;
}

.step p {
  margin: 0 0 12px;
  color: var(--text-soft);
  font-size: 15px;
}

.band {
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: var(--bg-soft);
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 40px;
  align-items: center;
}

/* ---------- docs layout ---------- */

.docs {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  max-width: 1280px;
  margin: 0 auto;
}

.sidebar {
  position: sticky;
  top: 64px;
  align-self: start;
  height: calc(100vh - 64px);
  overflow-y: auto;
  padding: 28px 16px 28px 24px;
  border-right: 1px solid var(--border);
}

.sidebar h4 {
  margin: 18px 0 6px 10px;
  color: var(--text-soft);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.sidebar h4:first-child {
  margin-top: 0;
}

.sidebar a {
  display: block;
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  color: var(--text-soft);
  font-size: 14.5px;
}

.sidebar a:hover {
  color: var(--text);
  background: var(--bg-soft);
  text-decoration: none;
}

.sidebar a[aria-current="page"] {
  color: var(--accent);
  background: var(--accent-soft);
  font-weight: 600;
}

.sidebar .toc a {
  padding-left: 22px;
  font-size: 13.5px;
}

.content {
  min-width: 0;
  padding: 40px 48px 80px;
}

.prose {
  max-width: 780px;
}

.prose h1 {
  margin: 0 0 12px;
  font-size: 38px;
  line-height: 1.12;
  letter-spacing: -0.03em;
}

.prose .subtitle {
  margin: 0 0 32px;
  color: var(--text-soft);
  font-size: 18px;
}

.prose h2 {
  margin: 48px 0 12px;
  padding-top: 8px;
  font-size: 24px;
  letter-spacing: -0.02em;
}

.prose h3 {
  margin: 28px 0 8px;
  font-size: 18px;
}

.prose p,
.prose li {
  color: var(--text);
}

.prose ul,
.prose ol {
  padding-left: 22px;
}

.prose li + li {
  margin-top: 4px;
}

.anchor {
  margin-left: 8px;
  color: var(--border-strong);
  font-weight: 400;
  opacity: 0;
  transition: opacity 160ms ease;
}

h2:hover .anchor,
h3:hover .anchor {
  opacity: 1;
}

.table-wrap {
  margin: 16px 0 24px;
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14.5px;
}

th,
td {
  padding: 10px 14px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--border);
}

th {
  background: var(--bg-soft);
  color: var(--text-soft);
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

tr:last-child td {
  border-bottom: none;
}

.code {
  position: relative;
  margin: 16px 0 24px;
}

.code pre {
  margin: 0;
  padding: 16px 18px;
  overflow-x: auto;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--code-bg);
  line-height: 1.55;
}

.code .label {
  position: absolute;
  top: 8px;
  right: 56px;
  color: var(--text-soft);
  font-family: var(--mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.copy-btn {
  position: absolute;
  top: 6px;
  right: 6px;
  padding: 3px 8px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-soft);
  font-family: var(--font);
  font-size: 12px;
  cursor: pointer;
  opacity: 0;
  transition: opacity 160ms ease, transform 160ms var(--ease-out);
}

.code:hover .copy-btn,
.copy-btn:focus-visible {
  opacity: 1;
}

.copy-btn:active {
  transform: scale(0.96);
}

.callout {
  margin: 20px 0;
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  background: var(--accent-soft);
  font-size: 15px;
}

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

.callout p {
  margin: 0;
}

.figure {
  margin: 20px 0 28px;
  padding: 16px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
}

.figure figcaption {
  margin-top: 10px;
  color: var(--text-soft);
  font-size: 13px;
  text-align: center;
}

.pager {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  max-width: 780px;
  margin-top: 56px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

.pager a {
  display: flex;
  flex-direction: column;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  min-width: 200px;
}

.pager a:hover {
  border-color: var(--accent);
  text-decoration: none;
}

.pager small {
  color: var(--text-soft);
  font-size: 12px;
}

.pager .next {
  margin-left: auto;
  text-align: right;
}

/* ---------- diagram illustrations ---------- */

.dg-node {
  fill: var(--surface);
  stroke-width: 1.5;
}

.dg-node.ok {
  fill: var(--ok-soft);
  stroke: var(--ok);
}

.dg-node.warn {
  fill: var(--warn-soft);
  stroke: var(--warn);
}

.dg-node.bad {
  fill: var(--bad-soft);
  stroke: var(--bad);
}

.dg-node.plain {
  stroke: var(--border-strong);
}

.dg-bar.ok,
.dg-dot.ok {
  fill: var(--ok);
}

.dg-bar.warn,
.dg-dot.warn {
  fill: var(--warn);
}

.dg-bar.bad,
.dg-dot.bad {
  fill: var(--bad);
}

.dg-title {
  fill: var(--text);
  font-size: 13px;
  font-weight: 650;
}

.dg-sub {
  fill: var(--text-soft);
  font-size: 10.5px;
}

.dg-mono {
  fill: var(--text);
  font-family: var(--mono);
  font-size: 10.5px;
}

.dg-edge {
  fill: none;
  stroke: var(--border-strong);
  stroke-width: 1.6;
}

.dg-edge.ok {
  stroke: var(--ok);
  stroke-width: 2.4;
}

.dg-edge.bad {
  stroke: var(--bad);
  stroke-width: 2.4;
}

.dg-pill {
  fill: var(--surface);
  stroke-width: 1.5;
}

.dg-pill.ok {
  stroke: var(--ok);
}

.dg-pill.bad {
  stroke: var(--bad);
}

.dg-pill-text {
  fill: var(--text);
  font-size: 11px;
  font-weight: 700;
  font-family: var(--mono);
}

.dg-arrow {
  fill: var(--border-strong);
}

.dg-box {
  fill: var(--surface);
  stroke: var(--border-strong);
  stroke-width: 1.2;
}

.dg-box.accent {
  fill: var(--accent-soft);
  stroke: var(--accent);
}

.dg-label {
  fill: var(--text-soft);
  font-size: 11px;
}

/* ---------- footer ---------- */

.site-footer {
  border-top: 1px solid var(--border);
  padding: 28px 24px;
  color: var(--text-soft);
  font-size: 14px;
}

.site-footer .inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  max-width: 1200px;
  margin: 0 auto;
}

/* ---------- entrance motion (decorative, home only) ---------- */

.reveal {
  animation: reveal 600ms var(--ease-out) both;
}

.reveal.d1 {
  animation-delay: 60ms;
}

.reveal.d2 {
  animation-delay: 120ms;
}

.reveal.d3 {
  animation-delay: 180ms;
}

@keyframes reveal {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (hover: hover) and (pointer: fine) {
  .card {
    transition: transform 200ms var(--ease-out), border-color 200ms ease;
  }

  .card:hover {
    transform: translateY(-2px);
    border-color: var(--border-strong);
  }
}

@media (prefers-reduced-motion: reduce) {
  .reveal {
    animation: none;
  }

  .card,
  .btn,
  .icon-btn {
    transition: none;
  }

  .flow {
    display: none;
  }
}

/* ---------- responsive ---------- */

@media (max-width: 1000px) {
  .hero-inner,
  .split {
    grid-template-columns: minmax(0, 1fr);
  }

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

  .status-row {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (max-width: 860px) {
  .topnav {
    display: none;
  }

  .menu-btn {
    display: inline-flex;
    margin-left: auto;
  }

  body.nav-open .topnav {
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    padding: 12px 16px;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
  }

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

  .sidebar {
    position: static;
    height: auto;
    padding: 16px;
    border-right: none;
    border-bottom: 1px solid var(--border);
  }

  .sidebar .toc {
    display: none;
  }

  .content {
    padding: 28px 16px 64px;
  }
}

@media (max-width: 600px) {
  .topbar {
    padding: 0 16px;
  }

  .hero {
    padding: 48px 16px 40px;
  }

  .section {
    padding: 48px 16px;
  }

  .grid,
  .status-row {
    grid-template-columns: minmax(0, 1fr);
  }

  .prose h1 {
    font-size: 30px;
  }

  .pager {
    flex-direction: column;
  }

  .pager a {
    min-width: 0;
  }
}