:root {
  --bg: #0c1020;
  --bg-elev: #141a2e;
  --panel: #12182b;
  --line: rgba(156, 176, 214, 0.16);
  --text: #e7eefc;
  --muted: #95a3c2;
  --accent: #9ebfff;
  --easy: #3ddc97;
  --medium: #ffc14d;
  --hard: #ff6b81;
  --shadow: 0 16px 40px rgba(0, 0, 0, 0.35);
  --radius: 12px;
  color-scheme: dark;
  font-family: "Segoe UI", ui-sans-serif, system-ui, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
}

body {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

button, input { font: inherit; color: inherit; }

button { cursor: pointer; }

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

::selection { background: rgba(158, 191, 255, 0.35); }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
  background: rgba(12, 16, 32, 0.92);
  z-index: 5;
}

.brand {
  display: flex;
  gap: 12px;
  align-items: center;
  min-width: 0;
}

.brand h1 {
  margin: 0;
  font-size: 18px;
  letter-spacing: -0.02em;
  font-weight: 650;
}

.brand p {
  margin: 3px 0 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.35;
  max-width: 460px;
}

.logo {
  position: relative;
  width: 32px;
  height: 32px;
  flex: none;
}

.logo span {
  position: absolute;
  border-radius: 50%;
  display: block;
}

.logo span:nth-child(1) { width: 14px; height: 14px; background: var(--easy); left: 1px; top: 12px; }
.logo span:nth-child(2) { width: 13px; height: 13px; background: var(--medium); left: 11px; top: 1px; }
.logo span:nth-child(3) { width: 13px; height: 13px; background: var(--hard); left: 16px; top: 15px; }

.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  justify-content: flex-end;
}

.search input, .ghost, .diff-group, .segment, .zoom, .card, .legend-card, .tooltip, #detail-panel, #tags-panel {
  background: var(--bg-elev);
}

.search input {
  width: 230px;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 8px 12px;
  background: #0e1426;
}

.search input::placeholder { color: #7f8cab; }

.diff-group, .segment {
  display: flex;
  padding: 3px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: #0e1426;
}

.diff-group button, .segment button, .ghost, .zoom button, .text-btn, #detail-open {
  border: 0;
  background: transparent;
  color: var(--muted);
  border-radius: 999px;
  padding: 7px 10px;
}

.diff-group button {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
}

.diff-group button .count { color: inherit; opacity: 0.75; font-variant-numeric: tabular-nums; }

.diff-group button[aria-pressed="true"][data-diff="Easy"] { background: rgba(61, 220, 151, 0.16); color: var(--easy); }
.diff-group button[aria-pressed="true"][data-diff="Medium"] { background: rgba(255, 193, 77, 0.16); color: var(--medium); }
.diff-group button[aria-pressed="true"][data-diff="Hard"] { background: rgba(255, 107, 129, 0.16); color: var(--hard); }

.segment button[aria-pressed="true"], .ghost:hover, .zoom button:hover, .text-btn:hover {
  background: rgba(158, 191, 255, 0.12);
  color: var(--text);
}

.ghost, .text-btn { border: 1px solid var(--line); }
.text-btn { border: 0; padding: 0; color: var(--accent); background: transparent; }

.dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  display: inline-block;
  flex: none;
}

.dot.easy { background: var(--easy); }
.dot.medium { background: var(--medium); }
.dot.hard { background: var(--hard); }
.dot.dim { background: rgba(232, 238, 252, 0.28); }

.workspace {
  flex: 1;
  min-height: 0;
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr) 320px;
  position: relative;
}

#tags-panel, #detail-panel {
  min-height: 0;
  overflow: auto;
  border-right: 1px solid var(--line);
  padding: 14px 14px 20px;
  background: var(--panel);
}

#detail-panel { border-right: 0; border-left: 1px solid var(--line); }

.panel-head, .detail-actions, .tag-tools {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

h2, h3 { margin: 0; font-size: 15px; letter-spacing: -0.01em; }
h3 { margin-top: 18px; }

.hint, .footnote {
  color: var(--muted);
  font-size: 12.5px;
  line-height: 1.45;
}

.hint { margin: 8px 0; }

.segment { width: 100%; margin: 8px 0; }
.segment button { flex: 1; }

.tag-search { display: block; margin-top: 8px; }
.tag-search input { width: 100%; }

#tag-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-top: 8px;
}

.tag-row {
  display: grid;
  grid-template-columns: 10px 1fr auto;
  gap: 8px;
  align-items: center;
  width: 100%;
  text-align: left;
  border: 0;
  border-radius: 8px;
  padding: 7px 8px;
  background: transparent;
  color: var(--text);
}

.tag-row:hover { background: rgba(255, 255, 255, 0.04); }

.tag-row[aria-pressed="true"] {
  background: color-mix(in srgb, var(--chip, var(--accent)) 18%, transparent);
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--chip, var(--accent)) 55%, transparent);
}

.tag-row .count {
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
}

.swatch {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.how {
  margin-top: 16px;
  border-top: 1px solid var(--line);
  padding-top: 10px;
}

.how summary { cursor: pointer; color: var(--text); font-size: 13px; }
.how p { color: var(--muted); font-size: 13px; line-height: 1.5; }

.footnote { margin-top: 14px; }

#map-panel { position: relative; min-width: 0; min-height: 280px; }

canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  touch-action: none;
  cursor: grab;
}

canvas.is-dragging { cursor: grabbing; }
canvas.is-pointing { cursor: pointer; }

.hud { position: absolute; z-index: 2; }

.status {
  top: 12px;
  left: 12px;
  margin: 0;
  max-width: min(520px, calc(100% - 24px));
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(12, 16, 32, 0.82);
  border: 1px solid var(--line);
  font-size: 13px;
  pointer-events: none;
}

.legend-card {
  left: 12px;
  bottom: 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 10px 12px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: rgba(14, 20, 38, 0.9);
  box-shadow: var(--shadow);
}

.legend {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 12px;
  margin: 0;
  padding: 0;
  font-size: 12px;
  color: var(--muted);
}

.legend li { display: inline-flex; align-items: center; gap: 6px; }

.check {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12.5px;
  color: var(--text);
}

.zoom {
  right: 12px;
  bottom: 12px;
  display: flex;
  gap: 4px;
  padding: 4px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(14, 20, 38, 0.92);
  box-shadow: var(--shadow);
}

.zoom button {
  min-width: 36px;
  height: 36px;
  border-radius: 999px;
  color: var(--text);
}

.empty, .loading {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  z-index: 3;
  pointer-events: none;
}

.empty[hidden], .loading[hidden], #tooltip[hidden], #scrim[hidden], #detail-body[hidden] {
  display: none !important;
}

.card {
  pointer-events: auto;
  width: min(360px, calc(100% - 32px));
  padding: 18px;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: rgba(16, 22, 40, 0.95);
  box-shadow: var(--shadow);
}

.card h2 { margin-bottom: 6px; }
.card p { margin: 0 0 14px; color: var(--muted); line-height: 1.45; }
.card button, #detail-open {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  padding: 8px 12px;
  background: var(--accent);
  color: #0d1324;
  font-weight: 650;
  text-decoration: none;
}

.tooltip {
  position: fixed;
  z-index: 6;
  max-width: 280px;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: rgba(16, 22, 40, 0.96);
  box-shadow: var(--shadow);
  pointer-events: none;
}

.tooltip strong { display: block; margin-bottom: 4px; }
.tooltip .meta { color: var(--muted); font-size: 12px; margin-bottom: 6px; }
.tooltip .chips, .chip-row { display: flex; flex-wrap: wrap; gap: 4px; }

.chip, .tag-chip {
  border: 0;
  border-radius: 999px;
  padding: 3px 8px;
  font-size: 12px;
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
}

.tag-chip[aria-pressed="true"] { box-shadow: inset 0 0 0 1px var(--accent); }

#detail-kicker {
  margin: 0 0 4px;
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

#detail-title { font-size: 22px; line-height: 1.25; margin: 0 0 8px; }

.detail-actions { margin: 12px 0; justify-content: flex-start; }
#detail-open { background: var(--accent); color: #0d1324; border: 0; }
#detail-focus { color: var(--text); }

#detail-similar {
  list-style: none;
  margin: 8px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.similar-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 4px;
  align-items: stretch;
}

.similar {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 2px;
  width: 100%;
  text-align: left;
  border: 0;
  border-radius: 10px;
  padding: 8px;
  background: rgba(255, 255, 255, 0.03);
  color: var(--text);
}

.similar:hover, .open-mini:hover { background: rgba(255, 255, 255, 0.07); }

.similar .meta { color: var(--muted); font-size: 12px; }

.open-mini {
  border: 0;
  border-radius: 10px;
  width: 36px;
  display: grid;
  place-items: center;
  text-decoration: none;
  color: var(--accent);
  background: rgba(255, 255, 255, 0.03);
}

#scrim {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.45);
  z-index: 4;
}

.mobile-only { display: none; }

@media (max-width: 980px) {
  .mobile-only { display: inline-flex; }
  header { align-items: stretch; flex-direction: column; }
  .toolbar { justify-content: flex-start; }
  .search input { width: 100%; }
  .workspace { grid-template-columns: 1fr; }
  #tags-panel {
    position: absolute;
    z-index: 5;
    top: 0;
    bottom: 0;
    left: 0;
    width: min(380px, 92vw);
    transform: translateX(-105%);
    transition: transform 160ms ease;
    border-right: 1px solid var(--line);
    box-shadow: var(--shadow);
  }
  #tags-panel.open { transform: none; }
  #detail-panel { display: none; }
  #detail-panel.has-problem {
    display: block;
    position: absolute;
    z-index: 3;
    left: 8px;
    right: 8px;
    bottom: 8px;
    max-height: min(42dvh, 380px);
    border: 1px solid var(--line);
    border-radius: 16px;
    box-shadow: var(--shadow);
  }
  .zoom { top: 54px; bottom: auto; right: 12px; }
  #detail-empty p { margin-bottom: 0; }
  .legend-card { max-width: calc(100% - 110px); }
}

@media (max-width: 640px) {
  .brand p { display: none; }
  .diff-group button .count { display: none; }
  .legend li:last-child { display: none; }
}

/* Directory and list share the map's filters and detail panel. */
[hidden] { display: none !important; }
#browser-panel { min-width: 0; display: flex; flex-direction: column; min-height: 0; }
.view-tabs { display: flex; gap: 6px; padding: 12px 20px; border-bottom: 1px solid var(--line); }
.view-tabs button { background: transparent; border: 1px solid transparent; border-radius: 8px; padding: 9px 18px; color: var(--muted); }
.view-tabs button[aria-pressed="true"] { color: var(--accent); background: #202d4b; border-color: var(--line); }
#directory-panel, #problems-panel { overflow: auto; padding: 24px; flex: 1; }
#map-panel { flex: 1; }
.browser-heading { display: flex; justify-content: space-between; align-items: flex-start; flex-wrap: wrap; gap: 16px; margin-bottom: 20px; }
.browser-heading h2 { font-size: 28px; letter-spacing: -0.035em; }
.eyebrow { font-size: 10px; letter-spacing: 0.15em; color: var(--accent); margin: 0 0 8px; }
.browser-heading label { font-size: 12px; color: var(--muted); display: grid; gap: 6px; }
select { font: inherit; color: var(--text); background: var(--bg-elev); border: 1px solid var(--line); border-radius: 8px; padding: 8px; }
#cluster-search { width: min(420px, 100%); border-radius: 9px; }
#cluster-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(225px, 1fr)); gap: 14px; }
.cluster-card { text-align: left; background: var(--bg-elev); border: 1px solid var(--line); border-top: 3px solid var(--cluster-color); border-radius: 12px; padding: 18px; color: var(--text); transition: background 120ms; }
.cluster-card:hover { background: #1d2741; }
.cluster-card h3 { margin: 0; font-size: 17px; }
.cluster-count { margin: 10px 0 14px; font-size: 24px; letter-spacing: -0.03em; }
.difficulty-bar { display: flex; height: 5px; border-radius: 6px; overflow: hidden; background: var(--line); }
.difficulty-bar .easy { background: var(--easy); }.difficulty-bar .medium { background: var(--medium); }.difficulty-bar .hard { background: var(--hard); }
.breakdown { display: flex; gap: 9px; font-size: 11px; margin: 10px 0 20px; }
.easy { color: var(--easy); }.medium { color: var(--medium); }.hard { color: var(--hard); }
.cluster-link { color: var(--accent); font-size: 12px; }
.table-scroll { overflow-x: auto; margin-top: 18px; }
.problem-table { width: 100%; border-collapse: collapse; text-align: left; font-size: 13px; }
.problem-table th { color: var(--muted); font-size: 11px; text-transform: uppercase; letter-spacing: 0.06em; }
.problem-table th, .problem-table td { border-bottom: 1px solid var(--line); padding: 13px 10px; }
.problem-table td:nth-child(2) { min-width: 175px; }
.problem-table a { color: var(--text); text-decoration: none; }.problem-table a:hover { color: var(--accent); text-decoration: underline; }
.problem-table .chip-row { min-width: 140px; }
.premium { color: var(--muted); font-size: 10px; }
.pagination { display: flex; justify-content: space-between; align-items: center; gap: 12px; margin-top: 20px; font-size: 12px; color: var(--muted); }
button:disabled { opacity: 0.35; cursor: default; }
@media (max-width: 1200px) and (min-width: 981px) { .workspace { grid-template-columns: 235px minmax(0, 1fr) 260px; } }
@media (max-width: 640px) { #directory-panel, #problems-panel { padding: 16px; } .browser-heading h2 { font-size: 24px; } .view-tabs { padding: 10px 16px; } }
.distance-control { border: 1px solid var(--line); border-radius: 10px; padding: 14px; margin-bottom: 18px; }
.distance-control label { display: flex; justify-content: space-between; font-size: 13px; }
.distance-control output { color: var(--accent); font-variant-numeric: tabular-nums; }
.distance-control input { width: 100%; margin: 12px 0 0; accent-color: var(--accent); }
.cluster-preview { display: block; width: 100%; height: 80px; margin: 12px 0; background: var(--bg); border-radius: 8px; }
.cluster-actions { display: flex; gap: 6px; flex-wrap: wrap; }
.cluster-actions button { font-size: 12px; color: var(--accent); }
article.cluster-card { cursor: default; }

#cluster-min-size { width: 125px; font: inherit; color: var(--text); background: var(--bg-elev); border: 1px solid var(--line); border-radius: 8px; padding: 8px; }