:root {
  color-scheme: light;
  --page: #f9f9f7;
  --surface: #fcfcfb;
  --ink: #0b0b0b;
  --ink-2: #52514e;
  --muted: #898781;
  --grid: #e1e0d9;
  --axis: #c3c2b7;
  --border: rgba(11, 11, 11, 0.10);
  --accent: #2a78d6;
  --accent-ink: #1c5cab;
  --accent-wash: rgba(42, 120, 214, 0.10);
  --side: #898781;
  --root: #0b0b0b;
  --critical: #d03b3b;
  --warning: #fab219;
  --button-ink: #ffffff;
  --shadow: 0 1px 2px rgba(11, 11, 11, 0.06), 0 4px 16px rgba(11, 11, 11, 0.04);
  --sans: system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}

@media (prefers-color-scheme: dark) {
  :root:where(:not([data-theme="light"])) {
    color-scheme: dark;
    --page: #0d0d0d;
    --surface: #1a1a19;
    --ink: #ffffff;
    --ink-2: #c3c2b7;
    --grid: #2c2c2a;
    --axis: #383835;
    --border: rgba(255, 255, 255, 0.10);
    --accent: #3987e5;
    --accent-ink: #86b6ef;
    --accent-wash: rgba(57, 135, 229, 0.12);
    --root: #ffffff;
    --shadow: none;
  }
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --page: #0d0d0d;
  --surface: #1a1a19;
  --ink: #ffffff;
  --ink-2: #c3c2b7;
  --grid: #2c2c2a;
  --axis: #383835;
  --border: rgba(255, 255, 255, 0.10);
  --accent: #3987e5;
  --accent-ink: #86b6ef;
  --accent-wash: rgba(57, 135, 229, 0.12);
  --root: #ffffff;
  --shadow: none;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font: 15px/1.55 var(--sans);
}

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

:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }

.wrap { max-width: 1120px; margin: 0 auto; padding: 0 16px; }

/* Header */

.top { border-bottom: 1px solid var(--border); background: var(--surface); }
.top .wrap { display: flex; align-items: center; gap: 16px; min-height: 56px; flex-wrap: wrap; }
.brand { display: flex; align-items: center; gap: 8px; font: 600 16px/1 var(--mono); color: var(--ink); text-decoration: none; }
.brand svg { width: 22px; height: 22px; }
.top nav { display: flex; gap: 14px; flex-wrap: wrap; margin-left: auto; font-size: 14px; }
.top nav a { color: var(--ink-2); text-decoration: none; }
.top nav a:hover { color: var(--ink); text-decoration: underline; }

.ghost {
  font: inherit; font-size: 13px; color: var(--ink-2); background: transparent;
  border: 1px solid var(--border); border-radius: 8px; padding: 4px 10px; cursor: pointer;
}
.ghost:hover { color: var(--ink); background: var(--accent-wash); }

/* Hero */

.hero { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 24px 32px; align-items: end; padding: 40px 0 24px; }
.hero .label { color: var(--ink-2); font-size: 14px; margin: 0 0 4px; }
.hero .depth { font-size: clamp(56px, 11vw, 96px); font-weight: 650; line-height: 0.95; letter-spacing: -0.02em; margin: 0; }
.hero .tipline { margin: 12px 0 0; color: var(--ink-2); }
.hero .tipline strong { color: var(--ink); }
.hero .lede { max-width: 56ch; margin: 16px 0 0; color: var(--ink-2); }
.actions { display: flex; gap: 10px; flex-wrap: wrap; }

.button {
  display: inline-flex; align-items: center; gap: 8px; padding: 10px 16px; border-radius: 10px;
  font-weight: 600; text-decoration: none; border: 1px solid transparent; white-space: nowrap;
}
.button.primary { background: var(--accent); color: var(--button-ink); }
.button.primary:hover { filter: brightness(1.08); }
.button.secondary { border-color: var(--border); color: var(--ink); background: var(--surface); }
.button.secondary:hover { background: var(--accent-wash); }

.banner {
  display: flex; gap: 12px; align-items: flex-start; margin: 0 0 24px; padding: 12px 16px;
  border-radius: 10px; border: 1px solid var(--border); background: var(--surface);
}
.banner svg { flex: none; width: 20px; height: 20px; margin-top: 2px; }
.banner strong { display: block; }

/* Stat tiles */

.stats { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; margin-bottom: 24px; }
.tile { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 14px 16px; box-shadow: var(--shadow); }
.tile .label { color: var(--ink-2); font-size: 13px; margin: 0; }
.tile .value { font-size: 28px; font-weight: 600; margin: 2px 0 0; line-height: 1.2; }
.tile .sub { color: var(--muted); font-size: 13px; margin: 2px 0 0; }

/* Cards */

.card { background: var(--surface); border: 1px solid var(--border); border-radius: 14px; box-shadow: var(--shadow); margin-bottom: 24px; min-width: 0; }
.card header { display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap; padding: 16px 18px 0; }
.card h2 { font-size: 16px; margin: 0; }
.card .note { color: var(--ink-2); font-size: 13px; margin: 0; }
.card .body { padding: 12px 18px 18px; }
.card header .tools { margin-left: auto; display: flex; gap: 8px; }
.two { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 24px; align-items: start; }
.two > .card { margin-bottom: 24px; }

/* Legend */

.legend { display: flex; flex-wrap: wrap; gap: 6px 16px; list-style: none; margin: 10px 0 0; padding: 0 18px; font-size: 13px; color: var(--ink-2); }
.legend li { display: inline-flex; align-items: center; gap: 6px; }
.legend svg { width: 16px; height: 16px; overflow: visible; }

/* The tree */

.tree-box { position: relative; height: min(62vh, 560px); min-height: 320px; margin: 10px 0 0; border-top: 1px solid var(--border); overflow: hidden; touch-action: none; }
.tree-box svg { display: block; width: 100%; height: 100%; cursor: grab; }
.tree-box svg:active { cursor: grabbing; }
.tree-box .link { fill: none; stroke: var(--axis); stroke-width: 1px; }
.tree-box .link.main { stroke: var(--accent); stroke-width: 2px; }
.ring { fill: var(--surface); }
.tree-box .hit { fill: transparent; }
.tree-box .node { cursor: pointer; }
.tree-box .node:focus { outline: none; }
.tree-box .node:focus-visible .ring { stroke: var(--accent); stroke-width: 2px; }
.tree-box .label { font: 12px var(--sans); fill: var(--ink-2); paint-order: stroke; stroke: var(--surface); stroke-width: 3px; stroke-linejoin: round; }
.tree-box .label.tip { font-weight: 700; fill: var(--ink); }
.tree-box.far .label:not(.tip) { display: none; }
.tree-hint { position: absolute; left: 12px; bottom: 10px; font-size: 12px; color: var(--muted); pointer-events: none; }

.m-main { fill: var(--accent); }
.m-side { fill: var(--side); }
.m-root { fill: var(--root); }
.m-bad { stroke: var(--critical); stroke-width: 2.5px; stroke-linecap: round; fill: none; }
.m-excluded { stroke: var(--critical); stroke-width: 2px; fill: var(--surface); }
.m-lost { stroke: var(--warning); stroke-width: 2.5px; fill: var(--surface); }
.m-ghost { stroke: var(--muted); stroke-width: 1px; stroke-dasharray: 1.5 2; fill: var(--surface); }
.m-tipring { fill: none; stroke: var(--accent); stroke-width: 2px; }

/* Tooltip */

.tip-box {
  position: absolute; z-index: 5; pointer-events: none; max-width: 300px; padding: 10px 12px;
  background: var(--surface); color: var(--ink); border: 1px solid var(--border); border-radius: 10px;
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.16); font-size: 13px; line-height: 1.45;
}
.tip-box[hidden] { display: none; }
.tip-box .big { font-size: 15px; font-weight: 650; }
.tip-box .dim { color: var(--ink-2); }
.tip-box .mono { font-family: var(--mono); font-size: 12px; overflow-wrap: anywhere; }
.tip-box ul { margin: 6px 0 0; padding-left: 16px; }

/* Depth chart */

.chart { position: relative; }
.chart svg { display: block; width: 100%; height: auto; overflow: visible; }
.chart .gridline { stroke: var(--grid); stroke-width: 1px; }
.chart .baseline { stroke: var(--axis); stroke-width: 1px; }
.chart .tick { font: 11px var(--sans); fill: var(--muted); font-variant-numeric: tabular-nums; }
.chart .line { fill: none; stroke: var(--accent); stroke-width: 2px; stroke-linejoin: round; stroke-linecap: round; }
.chart .area { fill: var(--accent-wash); }
.chart .dot { fill: var(--accent); stroke: var(--surface); stroke-width: 2px; }
.chart .cross { stroke: var(--muted); stroke-width: 1px; }
.chart .endlabel { font: 600 12px var(--sans); fill: var(--ink); }
.chart .hitbox { fill: transparent; }

/* Canvas */

.canvas-view { overflow-x: auto; }
.canvas-view pre {
  margin: 0; font: 12px/1.15 var(--mono); letter-spacing: 0.02em; color: var(--ink);
  background: var(--page); border: 1px solid var(--border); border-radius: 8px; padding: 10px; width: max-content;
}
.canvas-view .blank { color: var(--grid); }
.scrub { display: flex; align-items: center; gap: 10px; margin-top: 12px; font-size: 13px; color: var(--ink-2); }
.scrub input { flex: 1; accent-color: var(--accent); }

/* Tables */

.table-tools { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; padding: 12px 18px 0; font-size: 13px; color: var(--ink-2); }
.table-tools select { font: inherit; color: var(--ink); background: var(--surface); border: 1px solid var(--border); border-radius: 8px; padding: 4px 8px; }
.table-scroll { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { text-align: left; padding: 8px 18px; border-top: 1px solid var(--border); vertical-align: top; }
th { font-size: 12px; font-weight: 600; color: var(--ink-2); border-top: none; white-space: nowrap; }
td.num { font-variant-numeric: tabular-nums; text-align: right; width: 1%; white-space: nowrap; }
td.mono { font-family: var(--mono); font-size: 12px; white-space: nowrap; }
td .why { display: block; color: var(--ink-2); font-size: 12px; }
.status { display: inline-flex; align-items: center; gap: 6px; white-space: nowrap; }
.status svg { width: 14px; height: 14px; flex: none; overflow: visible; }
.empty { color: var(--ink-2); padding: 8px 18px 16px; margin: 0; }

.lists { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 0 24px; padding: 0 0 12px; }
.lists h3 { font-size: 14px; margin: 12px 18px 4px; }
.lists ul { margin: 0; padding: 0 18px 0 36px; font-size: 14px; }
.lists li { margin: 4px 0; }
.lists .dim { color: var(--ink-2); }

footer { color: var(--muted); font-size: 13px; padding: 8px 0 40px; }
footer a { color: var(--ink-2); }

.error { color: var(--critical); }
.muted { color: var(--muted); }
.mono { font-family: var(--mono); }

@media (max-width: 860px) {
  .two, .lists { grid-template-columns: minmax(0, 1fr); }
  .stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .hero { grid-template-columns: minmax(0, 1fr); align-items: start; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}

@media (forced-colors: active) {
  .m-main, .m-side, .m-root { fill: CanvasText; }
  .tree-box .link.main { stroke: Highlight; }
}