:root {
  --bg: #0f172a;
  --text: #f8fafc;
  --muted: #cbd5e1;
  --accent: #38bdf8;
  --card: #1e293b;
  --line: #334155;
  --ink: #0f172a;
  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Pretendard, "Apple SD Gothic Neo", sans-serif;
  font-size: 16px;
  line-height: 1.6;
}

body {
  height: 100vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  padding: 24px;
}

.intro {
  flex: 0 0 auto;
  max-width: 65ch;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 650;
  letter-spacing: 0.04em;
}

h1,
h2,
h3,
p {
  margin: 0;
}

h1 {
  font-size: 40px;
  line-height: 1.25;
  font-weight: 650;
  letter-spacing: -0.02em;
}

h2 {
  margin-top: 8px;
  font-size: 24px;
  line-height: 1.35;
  font-weight: 650;
}

h3 {
  margin: 24px 0 8px;
  font-size: 13px;
  font-weight: 650;
  color: var(--muted);
}

.lede,
.why,
.meta {
  max-width: 65ch;
  color: var(--muted);
}

.lede {
  margin-top: 16px;
}

.stage {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 360px;
  gap: 24px;
  flex: 1 1 auto;
  min-height: 0;
  margin-top: 48px;
  align-items: stretch;
}

.graph-pane {
  position: relative;
  height: 100%;
  min-height: 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  background: var(--bg);
}

#graph,
#graph canvas {
  width: 100%;
  height: 100%;
}

#graph canvas {
  display: block;
  cursor: grab;
  touch-action: none;
}

#graph canvas:active {
  cursor: grabbing;
}

.fallback {
  position: absolute;
  inset: 24px;
  margin: auto;
  max-width: 42ch;
  color: var(--muted);
}

.panel {
  height: 100%;
  min-height: 0;
  overflow: auto;
  padding: 24px;
  background: var(--card);
  border-radius: 8px;
  border: 1px solid var(--line);
}

.meta {
  margin-top: 8px;
}

.why {
  margin-top: 16px;
}

.article {
  display: inline-block;
  margin-top: 16px;
  color: var(--ink);
  background: var(--accent);
  text-decoration: none;
  font-weight: 650;
  padding: 8px 16px;
  border-radius: 8px;
}

.rels,
.catalog {
  list-style: none;
  margin: 0;
  padding: 0;
}

.rels li,
.catalog li {
  margin: 0;
}

.rels li {
  padding: 8px 0;
  border-top: 1px solid var(--line);
  color: var(--text);
}

.search {
  display: block;
  margin-top: 24px;
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 650;
}

input[type="search"] {
  width: 100%;
  margin-bottom: 8px;
  padding: 8px 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
  font: inherit;
}

.catalog {
  overflow: auto;
}

.catalog button {
  width: 100%;
  min-height: 40px;
  padding: 8px;
  border: 0;
  border-radius: 8px;
  background: transparent;
  color: var(--text);
  font: inherit;
  text-align: left;
  cursor: pointer;
}

.catalog button small {
  display: block;
  color: var(--muted);
  font-size: 13px;
}

.catalog button.on {
  background: var(--accent);
  color: var(--ink);
}

.catalog button.on small {
  color: var(--ink);
}

button:focus-visible,
a:focus-visible,
input:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

@media (max-width: 800px) {
  body {
    height: auto;
    overflow: auto;
  }

  h1 {
    font-size: 32px;
  }

  .stage {
    display: grid;
    grid-template-columns: 1fr;
    height: auto;
  }

  .graph-pane {
    height: 70vh;
    min-height: 480px;
  }

  .panel {
    height: auto;
  }

  .catalog {
    max-height: 360px;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    scroll-behavior: auto;
  }
}