/* ── tokens ─────────────────────────────────────────────────── */
:root {
  --bg:        #f6f7f9;
  --bg-panel:  #ffffff;
  --bg-sunken: #eceef2;
  --ink:       #14171c;
  --ink-2:     #4a5160;
  --ink-3:     #7b8496;
  --line:      #d9dde5;
  --line-2:    #e8ebf0;
  --accent:    #1f5fd0;
  --accent-bg: #e8f0fd;
  --warn:      #b45309;
  --warn-bg:   #fdf3e3;
  --danger:    #b42318;
  --danger-bg: #fdecea;
  --ok:        #0f7b52;

  --overview:  #0e7490;
  --triage:    #7c3aed;
  --build:     #1f5fd0;
  --pressure:  #c2410c;
  --verify:    #0f7b52;

  --rail-w:    250px;
  --side-w:    400px;
  --top-h:     50px;

  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, sans-serif;
}
:root[data-theme="dark"] {
  --bg:        #0e1116;
  --bg-panel:  #161b22;
  --bg-sunken: #0a0d11;
  --ink:       #e8ecf2;
  --ink-2:     #a6b0be;
  --ink-3:     #6e7887;
  --line:      #2b323c;
  --line-2:    #222831;
  --accent:    #6ea8ff;
  --accent-bg: #16233a;
  --warn:      #e0a33a;
  --warn-bg:   #2c2313;
  --danger:    #f0705f;
  --danger-bg: #2e1715;
  --ok:        #4ec98e;

  --overview:  #4dc4d8;
  --triage:    #b28cff;
  --build:     #6ea8ff;
  --pressure:  #ff9a5c;
  --verify:    #4ec98e;
}

* { box-sizing: border-box; }
/* Several components below set an explicit display, which beats the UA
   stylesheet's [hidden]{display:none}. Without this the modal, the side
   panels and the error bar can never actually hide. */
[hidden] { display: none !important; }
html, body { height: 100%; margin: 0; }
body {
  background: var(--bg); color: var(--ink);
  font: 15px/1.5 var(--sans);
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}

/* ── topbar ─────────────────────────────────────────────────── */
.topbar {
  height: var(--top-h); display: flex; align-items: center; gap: 16px;
  padding: 0 14px; background: var(--bg-panel);
  border-bottom: 1px solid var(--line);
  position: relative; z-index: 20;
}
.brand { display: flex; align-items: center; gap: 9px; flex: 0 0 auto; }
.brand-mark {
  font: 700 11px/1 var(--mono); letter-spacing: .09em;
  background: var(--ink); color: var(--bg-panel);
  padding: 5px 7px; border-radius: 4px;
}
.brand-text { font-weight: 650; font-size: 14px; white-space: nowrap; }
.brand-text em { color: var(--ink-3); font-weight: 400; font-style: normal; }

.topbar-mid { flex: 1 1 auto; font-size: 12.5px; color: var(--ink-3); min-width: 0; }
.topbar-mid b { color: var(--ink-2); font-weight: 600; }

/* zoom-path breadcrumb */
.crumbs { display: flex; align-items: center; gap: 5px; overflow: hidden; }
.crumb {
  background: none; border: 0; padding: 2px 4px; cursor: pointer;
  font: 500 12.5px var(--sans); color: var(--accent);
  white-space: nowrap; text-overflow: ellipsis; overflow: hidden; max-width: 22ch;
  border-radius: 4px;
}
.crumb:hover { background: var(--accent-bg); }
.crumb[aria-current="true"] { color: var(--ink-2); cursor: default; font-weight: 600; }
.crumb[aria-current="true"]:hover { background: none; }
.crumb-sep { color: var(--ink-3); font-size: 11px; }

.topbar-actions { display: flex; align-items: center; gap: 6px; flex: 0 0 auto; }
.sep { width: 1px; height: 20px; background: var(--line); margin: 0 3px; }

.btn {
  font: 500 12.5px var(--sans); color: var(--ink-2);
  background: var(--bg-panel); border: 1px solid var(--line);
  padding: 5px 10px; border-radius: 6px; cursor: pointer;
  transition: background .12s, color .12s, border-color .12s;
}
.btn:hover { background: var(--bg-sunken); color: var(--ink); }
.btn[aria-pressed="true"] {
  background: var(--accent-bg); border-color: var(--accent); color: var(--accent);
}
.btn-sm { padding: 3px 7px; font-size: 11.5px; }
.btn-icon { width: 28px; padding: 5px 0; text-align: center; }

/* ── layout ─────────────────────────────────────────────────── */
.layout {
  height: calc(100% - var(--top-h));
  display: grid;
  grid-template-columns: var(--rail-w) minmax(0, 1fr);
  overflow: hidden;
}
.layout.with-side { grid-template-columns: var(--rail-w) minmax(0, 1fr) var(--side-w); }
.layout.with-both { grid-template-columns: var(--rail-w) minmax(0, 1fr) var(--side-w) var(--side-w); }

/* ── scene rail ─────────────────────────────────────────────── */
.rail {
  background: var(--bg-panel); border-right: 1px solid var(--line);
  overflow-y: auto; padding: 10px 0 40px;
}
.rail-block {
  font: 600 10px/1 var(--sans); letter-spacing: .11em; text-transform: uppercase;
  color: var(--ink-3); padding: 16px 14px 7px;
  display: flex; align-items: center; gap: 7px;
}
.rail-block::before { content: ""; width: 7px; height: 7px; border-radius: 2px; background: currentColor; }
.rail-block[data-block="overview"] { color: var(--overview); }
.rail-block[data-block="triage"]   { color: var(--triage); }
.rail-block[data-block="build"]    { color: var(--build); }
.rail-block[data-block="pressure"] { color: var(--pressure); }
.rail-block[data-block="verify"]   { color: var(--verify); }

.rail-item {
  display: block; width: 100%; text-align: left; cursor: pointer;
  background: none; border: 0; border-left: 3px solid transparent;
  padding: 7px 14px 7px 12px; color: var(--ink-2); font: 400 13.5px var(--sans);
}
.rail-item:hover { background: var(--bg-sunken); color: var(--ink); }
.rail-item[aria-current="true"] {
  background: var(--accent-bg); color: var(--ink); font-weight: 600;
  border-left-color: var(--accent);
}
.rail-item .n { font: 500 11px var(--mono); color: var(--ink-3); margin-right: 7px; }
.rail-item[aria-current="true"] .n { color: var(--accent); }
.rail-item .edited {
  float: right; font: 600 9px var(--mono); color: var(--warn);
  background: var(--warn-bg); padding: 2px 4px; border-radius: 3px; margin-top: 1px;
}

/* ── stage ──────────────────────────────────────────────────── */
.stage { display: flex; flex-direction: column; min-width: 0; overflow: hidden; }
.stage-head {
  padding: 12px 18px 10px; border-bottom: 1px solid var(--line-2);
  background: var(--bg-panel);
  display: flex; align-items: flex-start; justify-content: space-between; gap: 20px;
}
.stage-title h1 { margin: 0; font-size: 17px; font-weight: 650; letter-spacing: -.01em; }
.stage-title p  { margin: 3px 0 0; font-size: 12.5px; color: var(--ink-3); max-width: 78ch; }

.layers { display: flex; flex-wrap: wrap; gap: 5px; justify-content: flex-end; max-width: 46%; }
.layer-chip {
  font: 500 11.5px var(--sans); cursor: pointer; user-select: none;
  border: 1px solid var(--line); border-radius: 20px; padding: 3px 10px;
  color: var(--ink-3); background: var(--bg-panel); white-space: nowrap;
  transition: all .12s;
}
.layer-chip:hover { border-color: var(--ink-3); }
.layer-chip[aria-pressed="true"] {
  background: var(--accent); border-color: var(--accent); color: #fff;
}
.layer-chip .k { font: 600 9px var(--mono); opacity: .55; margin-left: 5px; }

/* ── viewport ───────────────────────────────────────────────── */
.viewport {
  flex: 1 1 auto; position: relative; overflow: hidden;
  background:
    radial-gradient(circle at 1px 1px, var(--line) 1px, transparent 0) 0 0 / 22px 22px,
    var(--bg);
  cursor: grab;
}
.viewport.grabbing { cursor: grabbing; }
.pan { position: absolute; top: 0; left: 0; transform-origin: 0 0; will-change: transform; }
.diagram svg { display: block; max-width: none !important; height: auto; }
.diagram .clickable, .diagram [class*='clickable'] { cursor: pointer; }
/* a node that a deep link pointed at */
@keyframes nodePulse {
  0%, 100% { stroke-width: 2px;  }
  50%      { stroke-width: 6px;  }
}
.diagram .node-focus rect, .diagram .node-focus path,
.diagram .node-focus polygon, .diagram .node-focus circle,
.diagram .node-focus ellipse {
  stroke: var(--accent) !important;
  animation: nodePulse 900ms ease-in-out 3;
}
.diagram .clickable:hover rect, .diagram .clickable:hover polygon,
.diagram .clickable:hover circle { filter: brightness(0.96); }

.zoombadge {
  position: absolute; right: 12px; bottom: 12px;
  font: 500 11px var(--mono); color: var(--ink-3);
  background: var(--bg-panel); border: 1px solid var(--line);
  padding: 3px 8px; border-radius: 5px; pointer-events: none;
}

.errbar {
  background: var(--danger-bg); border-top: 1px solid var(--danger);
  color: var(--danger); font: 12.5px var(--mono);
  padding: 7px 14px; display: flex; gap: 9px; align-items: baseline;
  max-height: 96px; overflow-y: auto;
}
.errbar em { color: var(--ink-3); font-style: normal; margin-left: auto; white-space: nowrap; }

/* ── side panels ────────────────────────────────────────────── */
.side {
  background: var(--bg-panel); border-left: 1px solid var(--line);
  display: flex; flex-direction: column; min-width: 0; overflow: hidden;
}
.side-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 14px; border-bottom: 1px solid var(--line-2);
}
.side-head h2 {
  margin: 0; font: 600 10px/1 var(--sans); letter-spacing: .11em;
  text-transform: uppercase; color: var(--ink-3);
}
.side-head-actions { display: flex; align-items: center; gap: 7px; }
.dirty {
  font: 600 9px var(--mono); color: var(--warn);
  background: var(--warn-bg); padding: 2px 5px; border-radius: 3px;
}
.side-foot {
  border-top: 1px solid var(--line-2); padding: 7px 14px;
  font-size: 11px; color: var(--ink-3);
}
kbd {
  font: 500 10.5px var(--mono); background: var(--bg-sunken);
  border: 1px solid var(--line); border-radius: 3px; padding: 1px 4px;
}

#editor {
  flex: 1 1 auto; width: 100%; resize: none; border: 0; outline: none;
  padding: 12px 14px; background: var(--bg-sunken); color: var(--ink);
  font: 12.5px/1.65 var(--mono); tab-size: 2;
}

/* ── notes ──────────────────────────────────────────────────── */
.notes { flex: 1 1 auto; overflow-y: auto; padding: 4px 16px 40px; }
.notes h3 {
  font: 600 10px/1 var(--sans); letter-spacing: .1em; text-transform: uppercase;
  color: var(--ink-3); margin: 20px 0 8px; padding-bottom: 6px;
  border-bottom: 1px solid var(--line-2);
}
.notes ul { margin: 0; padding-left: 17px; }
.notes li { margin: 0 0 7px; font-size: 13px; color: var(--ink-2); }
.notes li strong { color: var(--ink); font-weight: 620; }
.notes code {
  font: 11.5px var(--mono); background: var(--bg-sunken);
  border: 1px solid var(--line-2); border-radius: 3px; padding: 1px 4px; color: var(--ink);
}
.notes .num { color: var(--accent); font-weight: 650; font-variant-numeric: tabular-nums; }
.notes .risk    { color: var(--danger); font-weight: 620; }
.notes .tradeoff{ color: var(--warn);   font-weight: 620; }

/* ── modal + toast ──────────────────────────────────────────── */
.modal {
  position: fixed; inset: 0; z-index: 50; display: grid; place-items: center;
  background: rgba(10, 13, 17, .5); backdrop-filter: blur(2px);
}
.modal-card {
  background: var(--bg-panel); border: 1px solid var(--line);
  border-radius: 10px; padding: 22px 26px; width: min(420px, 90vw);
  box-shadow: 0 18px 50px rgba(0,0,0,.28);
}
.modal-card h2 { margin: 0 0 14px; font-size: 15px; }
.keys { display: grid; grid-template-columns: auto 1fr; gap: 7px 16px; margin: 0 0 16px; }
.keys dt { text-align: right; }
.keys dd { margin: 0; font-size: 13px; color: var(--ink-2); }
.modal-foot { font-size: 12px; color: var(--ink-3); margin: 0 0 16px; }

.toast {
  position: fixed; bottom: 22px; left: 50%; transform: translateX(-50%);
  background: var(--ink); color: var(--bg-panel);
  font: 500 13px var(--sans); padding: 9px 16px; border-radius: 7px;
  z-index: 60; box-shadow: 0 8px 24px rgba(0,0,0,.25);
}

@media (max-width: 1100px) {
  .layout.with-both { grid-template-columns: var(--rail-w) minmax(0,1fr) var(--side-w); }
  .layout.with-both .side-notes { display: none; }
}