:root {
  --bg: hsl(40 20% 97%);
  --surface: hsl(40 25% 99%);
  --surface-2: hsl(40 15% 93%);
  --line: hsl(40 10% 85%);
  --text: hsl(30 10% 14%);
  --text-2: hsl(30 6% 40%);
  --text-3: hsl(30 5% 58%);
  --accent: hsl(210 70% 44%);
  --accent-soft: hsl(210 70% 44% / 0.12);
  --normative: hsl(30 8% 45%);
  --informative: hsl(200 40% 62%);
  --shadow: 0 1px 2px hsl(30 10% 14% / 0.06), 0 8px 24px -12px hsl(30 10% 14% / 0.25);
  --sidebar-w: 340px;
  --font: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 14px;
  line-height: 1.45;
  -webkit-font-smoothing: antialiased;
}

body {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  overflow: hidden;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

h1, h2, h3 { margin: 0; font-weight: 600; letter-spacing: -0.01em; }

/* ---------- Sidebar ---------- */

#sidebar {
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow-y: auto;
  background: var(--surface);
  border-right: 1px solid var(--line);
  scrollbar-width: thin;
  scrollbar-color: var(--line) transparent;
}

.brand {
  padding: 22px 20px 16px;
  border-bottom: 1px solid var(--line);
}
.brand h1 { font-size: 18px; letter-spacing: -0.02em; }
.tagline { margin: 6px 0 14px; color: var(--text-2); font-size: 13px; }

.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin: 0;
}
.stats div {
  padding: 8px 10px;
  background: var(--surface-2);
  border-radius: 8px;
}
.stats dt { font-size: 11px; color: var(--text-3); text-transform: uppercase; letter-spacing: 0.04em; }
.stats dd { margin: 2px 0 0; font-family: var(--mono); font-size: 15px; font-weight: 500; }

.panel {
  padding: 16px 20px;
  border-bottom: 1px solid var(--line);
}
.panel h2 {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-3);
  margin: 14px 0 8px;
}
.panel h2:first-child { margin-top: 0; }

/* search */
.search {
  position: relative;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 10px;
  height: 38px;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 10px;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.search:focus-within { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.search svg { width: 16px; height: 16px; fill: none; stroke: var(--text-3); stroke-width: 1.8; stroke-linecap: round; flex: none; }
.search input {
  flex: 1;
  min-width: 0;
  border: 0;
  background: transparent;
  font: inherit;
  color: var(--text);
  outline: none;
}
.search input::placeholder { color: var(--text-3); }
.search-results {
  list-style: none;
  margin: 6px 0 0;
  padding: 4px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 10px;
  box-shadow: var(--shadow);
  max-height: 260px;
  overflow-y: auto;
}
.search-results li {
  padding: 7px 10px;
  border-radius: 6px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  gap: 8px;
}
.search-results li:hover, .search-results li.active { background: var(--accent-soft); }
.search-results .id { font-family: var(--mono); font-size: 12px; color: var(--text-2); }
.search-results .empty { color: var(--text-3); cursor: default; }
.search-results .empty:hover { background: transparent; }

/* toggles & ranges */
.toggles { display: flex; gap: 14px; flex-wrap: wrap; }
.toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  user-select: none;
  padding: 3px 0;
}
.toggle input { accent-color: var(--accent); margin: 0; }
#filters > .toggle, .dive > .toggle { display: flex; }
.swatch.edge { display: inline-block; width: 22px; height: 2px; border-radius: 1px; }
.swatch.edge.normative { background: var(--normative); }
.swatch.edge.informative { background: var(--informative); height: 0; border-top: 2px dashed var(--informative); }

.range { display: block; margin-top: 8px; }
.range span { display: flex; justify-content: space-between; color: var(--text-2); font-size: 13px; }
.range output { font-family: var(--mono); color: var(--text); }
.range input { width: 100%; margin: 6px 0 0; accent-color: var(--accent); }

/* legend */
.legend { list-style: none; margin: 0; padding: 0; }
.legend li {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 6px;
  margin: 0 -6px;
  border-radius: 6px;
  cursor: pointer;
  user-select: none;
  transition: background 0.1s, opacity 0.15s;
}
.legend li:hover { background: var(--surface-2); }
.legend li.off { opacity: 0.4; }
.legend li.off .dot { background: transparent !important; box-shadow: inset 0 0 0 2px currentColor; }
.legend .dot { width: 11px; height: 11px; border-radius: 50%; flex: none; }
.legend .name { flex: 1; }
.legend .n { font-family: var(--mono); font-size: 12px; color: var(--text-3); }

/* detail */
.detail { position: relative; }
.detail .close {
  position: absolute;
  top: 10px; right: 12px;
  width: 28px; height: 28px;
  border: 0;
  border-radius: 50%;
  background: transparent;
  color: var(--text-3);
  font-size: 20px;
  line-height: 1;
  cursor: pointer;
}
.detail .close:hover { background: var(--surface-2); color: var(--text); }
.eyebrow { margin: 0 0 4px; font-size: 11px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--text-3); }
.detail h2 { font-size: 16px; text-transform: none; letter-spacing: -0.01em; color: var(--text); margin: 0 28px 4px 0; }
.detail .meta { margin: 0 0 12px; color: var(--text-2); font-size: 12.5px; }
.detail .meta code { font-family: var(--mono); font-size: 12px; background: var(--surface-2); padding: 1px 5px; border-radius: 4px; }
.button {
  display: inline-block;
  padding: 7px 12px;
  border-radius: 8px;
  background: var(--text);
  color: var(--surface);
  font-weight: 500;
  font-size: 13px;
  transition: transform 0.1s, background 0.15s;
}
.button:hover { text-decoration: none; background: var(--accent); transform: translateY(-1px); }
.button.primary { background: var(--accent); }
.button.primary:hover { background: hsl(210 70% 36%); }
.button.primary:disabled { background: var(--surface-2); color: var(--text-3); cursor: default; transform: none; }
button.button { border: 0; font: inherit; cursor: pointer; }
.actions { display: flex; gap: 8px; flex-wrap: wrap; }

/* dive mode */
.dive .back {
  display: inline-block;
  margin: -4px 0 12px -6px;
  padding: 4px 8px;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: var(--accent);
  font: inherit;
  font-weight: 500;
  cursor: pointer;
}
.dive .back:hover { background: var(--accent-soft); }
.dive h2 { font-size: 16px; text-transform: none; letter-spacing: -0.01em; color: var(--text); margin: 0 0 12px; }
.dive h2.section {
  font-size: 11px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--text-3);
  margin: 16px 0 8px;
}
.dive .stats { margin-bottom: 14px; }
.dive .legend { margin-top: 6px; }
.dive-detail {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}
.dive-detail .eyebrow { margin-bottom: 2px; }
.dive-detail h3 { font-size: 15px; margin: 0 0 4px; word-break: break-word; }
.dive-detail h3 code { font-family: var(--mono); font-size: 13px; }
.dive-detail .meta { margin: 0 0 10px; color: var(--text-2); font-size: 12.5px; }
.dive-detail .meta code { font-family: var(--mono); font-size: 12px; background: var(--surface-2); padding: 1px 5px; border-radius: 4px; }
.dive-detail .type-tag {
  display: inline-block;
  padding: 1px 7px;
  border-radius: 99px;
  font-size: 11px;
  font-weight: 500;
  color: #fff;
  vertical-align: middle;
}
.ref-list .sub { font-family: var(--mono); font-size: 11px; color: var(--text-3); }
.refs h3 {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-3);
  margin: 16px 0 6px;
}
.count { font-family: var(--mono); font-weight: 400; color: var(--text-3); }
.ref-list { list-style: none; margin: 0; padding: 0; max-height: 220px; overflow-y: auto; }
.ref-list li {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 6px;
  margin: 0 -6px;
  border-radius: 6px;
  cursor: pointer;
}
.ref-list li:hover { background: var(--surface-2); }
.ref-list .dot { width: 8px; height: 8px; border-radius: 50%; flex: none; }
.ref-list .name { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.ref-list .kind { font-size: 10px; text-transform: uppercase; letter-spacing: 0.05em; color: var(--text-3); }
.ref-list .kind.normative { color: var(--normative); }
.ref-list .kind.informative { color: var(--informative); }
.ref-list .empty { color: var(--text-3); cursor: default; }

.hint { margin-top: auto; padding: 14px 20px; color: var(--text-3); font-size: 12px; }
.hint p { margin: 0; }
kbd {
  font-family: var(--mono);
  font-size: 11px;
  padding: 1px 5px;
  border: 1px solid var(--line);
  border-bottom-width: 2px;
  border-radius: 4px;
  background: var(--surface);
  color: var(--text-2);
}

/* ---------- Stage ---------- */

#stage {
  position: relative;
  height: 100vh;
  overflow: hidden;
  background:
    radial-gradient(ellipse at 30% 20%, hsl(40 30% 99%) 0%, transparent 60%),
    var(--bg);
}
#graph { display: block; width: 100%; height: 100%; cursor: grab; }
#graph.dragging { cursor: grabbing; }
#graph.pointing { cursor: pointer; }

.tooltip {
  position: absolute;
  pointer-events: none;
  max-width: 280px;
  padding: 8px 11px;
  background: var(--text);
  color: var(--surface);
  border-radius: 8px;
  font-size: 12.5px;
  box-shadow: var(--shadow);
  transform: translate(12px, 12px);
  z-index: 2;
}
.tooltip .t { font-weight: 600; }
.tooltip .s { opacity: 0.7; font-family: var(--mono); font-size: 11px; margin-top: 2px; }

.loading {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  color: var(--text-2);
  background: hsl(40 20% 97% / 0.9);
  backdrop-filter: blur(2px);
  transition: opacity 0.4s;
  z-index: 3;
}
.loading.done { opacity: 0; pointer-events: none; }
.loading-box {
  width: min(360px, 80%);
  padding: 22px 24px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: var(--shadow);
}
.loading-box p { margin: 0; }
#loading-text { font-weight: 500; color: var(--text); }
.loading-detail {
  margin-top: 8px !important;
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--text-3);
  overflow-wrap: anywhere;
}
.bar {
  position: relative;
  height: 6px;
  margin-top: 12px;
  border-radius: 3px;
  background: var(--surface-2);
  overflow: hidden;
}
.bar > div {
  height: 100%;
  width: 0;
  border-radius: 3px;
  background: var(--accent);
  transition: width 0.15s ease-out;
}
.bar.indeterminate > div {
  width: 35% !important;
  animation: slide 1.1s ease-in-out infinite;
}
@keyframes slide {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(300%); }
}
.source { margin-top: 8px !important; }
.source a { color: var(--text-3); text-decoration: underline dotted; }

.toast {
  position: absolute;
  left: 50%;
  bottom: 20px;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 12px;
  max-width: min(560px, calc(100% - 32px));
  padding: 10px 10px 10px 16px;
  background: var(--text);
  color: var(--surface);
  border-radius: 12px;
  box-shadow: var(--shadow);
  font-size: 13px;
  z-index: 4;
  animation: rise 0.3s ease-out;
}
.toast .button { padding: 6px 12px; flex: none; }
.toast .close {
  flex: none;
  width: 28px; height: 28px;
  border: 0; border-radius: 50%;
  background: transparent;
  color: inherit;
  opacity: 0.7;
  font-size: 18px; line-height: 1;
  cursor: pointer;
}
.toast .close:hover { opacity: 1; background: hsl(0 0% 100% / 0.12); }
@keyframes rise {
  from { opacity: 0; transform: translate(-50%, 8px); }
  to { opacity: 1; transform: translate(-50%, 0); }
}

@media (max-width: 760px) {
  body { grid-template-columns: 1fr; grid-template-rows: 1fr 45vh; }
  #sidebar { order: 2; height: auto; border-right: 0; border-top: 1px solid var(--line); }
  #stage { height: auto; }
  .hint { display: none; }
}