:root {
  /* ── Activity Visualizer design tokens ── */
  --bg-main:        #eef2f5;
  --bg-panel:       #ffffff;
  --line-soft:      #d8e0e7;
  --ink:            #1a2c3d;
  --ink-soft:       #5a6d7e;
  --ink-faint:      #8fa0ad;

  /* Brand / accent */
  --primary:        #0f3d2e;
  --teal:           #0d6c80;
  --teal-soft:      #dff3f7;
  --teal-border:    #97d2df;

  /* Status */
  --critical:       #e85030;
  --noncritical:    #14a86f;

  /* Node sizing (overridden via JS custom properties) */
  --node-width:     260px;
  --node-gap:       32px;
  --link-font-size: 11px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Inter", "Space Grotesk", system-ui, sans-serif;
  color: var(--ink);
  background: linear-gradient(180deg, #f6fafc 0%, var(--bg-main) 100%);
  overflow: hidden;
}

/* ── Subtle background radials ─────────────────────────────── */
.page-bg {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(circle at 8% 8%,  rgba(13, 108, 128, 0.07), transparent 36%),
    radial-gradient(circle at 92% 90%, rgba(20, 168, 111, 0.08), transparent 32%);
}

/* ── App layout ─────────────────────────────────────────────── */
.app-frame {
  position: relative;
  display: grid;
  grid-template-columns: 272px 1fr;
  height: 100vh;
}

/* ── Left panel ─────────────────────────────────────────────── */
.left-panel {
  background: var(--bg-panel);
  border-right: 1px solid var(--line-soft);
  padding: 12px 10px;
  overflow-y: auto;
  height: 100vh;
  display: flex;
  flex-direction: column;
  gap: 8px;
  scrollbar-width: thin;
  scrollbar-color: var(--line-soft) transparent;
}

/* ── Brand block ────────────────────────────────────────────── */
.brand-block {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 4px 12px;
  border-bottom: 1px solid var(--line-soft);
  flex-shrink: 0;
}

.brand-back {
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  border-radius: 7px;
  border: 1px solid var(--line-soft);
  color: var(--ink-soft);
  text-decoration: none;
  flex-shrink: 0;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.brand-back:hover {
  background: var(--teal-soft);
  color: var(--teal);
  border-color: var(--teal-border);
}

.brand-wordmark {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1;
  min-width: 0;
}

.brand-wordmark__logo {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  background: linear-gradient(135deg, #0f3d2e 0%, #0d6c80 100%);
  color: #fff;
  display: grid;
  place-items: center;
  flex-shrink: 0;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
  min-width: 0;
}

.brand-text strong {
  font-family: "Space Grotesk", sans-serif;
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--ink);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.brand-text span {
  font-size: 0.68rem;
  color: var(--ink-faint);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* ── Panel groups ───────────────────────────────────────────── */
.panel-group {
  padding: 10px;
  border: 1px solid var(--line-soft);
  border-radius: 10px;
  background: #fbfdff;
  display: grid;
  gap: 8px;
}

.panel-group h2 {
  margin: 0;
  font-size: 0.71rem;
  font-family: "Space Grotesk", sans-serif;
  color: var(--ink-faint);
  text-transform: uppercase;
  letter-spacing: 0.07em;
  font-weight: 700;
}

/* ── Form controls ──────────────────────────────────────────── */
.field-wrap {
  display: grid;
  gap: 4px;
}

.field-wrap span {
  font-size: 0.76rem;
  color: var(--ink-soft);
  font-weight: 500;
}

.range-wrap {
  display: grid;
  gap: 5px;
}

.range-wrap span {
  font-size: 0.76rem;
  color: var(--ink-soft);
}

.range-wrap input[type="range"] {
  width: 100%;
  accent-color: var(--teal);
}

input[type="file"],
input[type="text"] {
  width: 100%;
  border: 1px solid var(--line-soft);
  border-radius: 7px;
  background: #fff;
  color: var(--ink);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.8rem;
  padding: 7px 10px;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

input[type="text"]:focus,
input[type="file"]:focus {
  outline: none;
  border-color: var(--teal);
  box-shadow: 0 0 0 3px rgba(13, 108, 128, 0.12);
}

/* ── Buttons ────────────────────────────────────────────────── */
button {
  border: 1px solid transparent;
  border-radius: 8px;
  background: var(--primary);
  color: #fff;
  font-family: "Space Grotesk", sans-serif;
  font-size: 0.82rem;
  font-weight: 600;
  padding: 8px 10px;
  cursor: pointer;
  transition: transform 0.13s ease, box-shadow 0.13s ease, background 0.13s ease;
}

button:hover:enabled {
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(15, 61, 46, 0.22);
  background: #0a2e22;
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

button.ghost {
  background: #fff;
  color: var(--teal);
  border-color: var(--teal-border);
}

button.ghost:hover:enabled {
  background: var(--teal-soft);
  box-shadow: 0 4px 12px rgba(13, 108, 128, 0.12);
}

/* ── Mode switch ────────────────────────────────────────────── */
.mode-btn {
  text-align: left;
}

.mode-switch {
  display: grid;
  gap: 6px;
}

.mode-btn.is-active {
  background: var(--teal-soft);
  border-color: var(--teal-border);
  color: var(--teal);
}

/* ── Checkbox ───────────────────────────────────────────────── */
.check-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--ink-soft);
  font-size: 0.81rem;
  cursor: pointer;
}

.check-wrap input {
  width: 15px;
  height: 15px;
  accent-color: var(--teal);
}

/* ── Main panel ─────────────────────────────────────────────── */
.main-panel {
  display: grid;
  grid-template-rows: auto auto 1fr;
  padding: 14px 14px 14px 12px;
  gap: 10px;
  height: 100vh;
  overflow: hidden;
}

/* ── Top bar ────────────────────────────────────────────────── */
.top-bar {
  border: 1px solid var(--line-soft);
  border-radius: 12px;
  background: #fff;
  padding: 10px 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: 0 1px 4px rgba(26, 44, 61, 0.05);
}

.top-bar h1 {
  margin: 0;
  font-family: "Space Grotesk", sans-serif;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--ink);
}

.top-actions {
  display: flex;
  gap: 7px;
}

/* ── Status bar ─────────────────────────────────────────────── */
.status {
  border: 1px solid var(--line-soft);
  border-radius: 10px;
  background: #fff;
  color: var(--ink-soft);
  padding: 8px 14px;
  font-size: 0.83rem;
  display: flex;
  align-items: center;
  gap: 8px;
}

/* ── Canvas viewer ──────────────────────────────────────────── */
.viewer {
  position: relative;
  border: 1px solid var(--line-soft);
  border-radius: 14px;
  background: #f6f9fb;
  padding: 20px;
  overflow: hidden;
  cursor: grab;
  min-height: 0;
  box-shadow: inset 0 1px 4px rgba(26, 44, 61, 0.04);
}

.viewer.panning {
  cursor: grabbing;
}

.canvas-content {
  width: max-content;
  min-width: 200px;
  transform-origin: top left;
  transition: transform 80ms ease;
  will-change: transform;
}

body.viewport-sync .canvas-content {
  transition: none !important;
}

/* ── Canvas controls ────────────────────────────────────────── */
.canvas-controls {
  position: absolute;
  right: 12px;
  bottom: 12px;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 5px 7px;
  border: 1px solid var(--teal-border);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(6px);
  box-shadow: 0 2px 10px rgba(13, 108, 128, 0.1);
  z-index: 30;
}

.canvas-btn {
  min-width: 32px;
  min-height: 30px;
  padding: 5px 8px;
  font-size: 1rem;
  font-weight: 700;
  color: var(--teal);
}

.zoom-level {
  min-width: 52px;
  text-align: center;
  color: var(--ink-soft);
  font-size: 0.75rem;
  font-family: "IBM Plex Mono", monospace;
}

/* ── Tree structure ─────────────────────────────────────────── */
.tree-level {
  display: inline-flex;
  flex-direction: column;
  gap: calc(var(--node-gap) + 10px);
  min-width: max-content;
}

.diagram-layer {
  position: relative;
  display: inline-block;
  min-width: max-content;
  isolation: isolate;
}

.connector-svg {
  position: absolute;
  inset: 0;
  overflow: visible;
  pointer-events: none;
  z-index: 0;
}

.connector {
  fill: none;
  stroke-width: 2;
}

.connector.normal   { stroke: #b8c1cb; }
.connector.critical { stroke: #e85030; }

.connector-label {
  fill: #5d6977;
  font-size: var(--link-font-size);
  font-weight: 700;
  font-family: "IBM Plex Mono", monospace;
  text-anchor: middle;
}

.subtree {
  display: inline-flex;
  align-items: flex-start;
  gap: var(--node-gap);
  position: relative;
  z-index: 2;
}

.node-shell {
  display: inline-flex;
  align-items: center;
  gap: 0;
  position: relative;
  z-index: 3;
}

.arrow-line {
  width: 26px;
  height: 2px;
  background: #95a9bc;
  position: relative;
  flex: 0 0 auto;
}

.arrow-line::after {
  content: "";
  position: absolute;
  right: -1px;
  top: -4px;
  border-left: 6px solid #95a9bc;
  border-top: 5px solid transparent;
  border-bottom: 5px solid transparent;
}

.children {
  margin-left: 6px;
  padding-left: calc(var(--node-gap) + 10px);
  display: inline-flex;
  flex-direction: column;
  gap: calc(var(--node-gap) + 2px);
}

/* ── Activity cards ─────────────────────────────────────────── */
.activity-card {
  position: relative;
  width: var(--node-width);
  border: 2px solid var(--critical);
  border-radius: 13px;
  background: #fff;
  overflow: visible;
  box-shadow: 0 2px 8px rgba(26, 44, 61, 0.07);
  opacity: 0;
  transform: translateY(8px);
  animation: reveal 220ms ease forwards;
  cursor: grab;
}

.activity-card.dragging {
  cursor: grabbing;
}

body.preparing-print .activity-card {
  opacity: 1 !important;
  transform: none !important;
  animation: none !important;
}

@keyframes reveal {
  to { opacity: 1; transform: translateY(0); }
}

.activity-card.noncritical { border-color: var(--noncritical); }
.activity-card.critical    { border-color: var(--critical); }

.activity-card.dimmed {
  opacity: 0.45;
}

/* ── Node top bar ───────────────────────────────────────────── */
.node-topbar {
  height: 22px;
  padding: 0 9px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: #fff;
  font-family: "Space Grotesk", sans-serif;
  font-size: 0.72rem;
  font-weight: 700;
  border-radius: 10px 10px 0 0;
}

.node-topbar > span:first-child {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 88%;
}

.activity-card.critical    .node-topbar { background: var(--critical); }
.activity-card.noncritical .node-topbar { background: var(--noncritical); }

/* ── Node body ──────────────────────────────────────────────── */
.node-title {
  min-height: 82px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 10px 12px;
  font-family: "Space Grotesk", sans-serif;
  font-size: 0.7rem;
  font-weight: 600;
  line-height: 1.28;
  overflow-wrap: anywhere;
  color: var(--ink);
}

/* ── Node dates footer ──────────────────────────────────────── */
.node-dates {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.57rem;
  background: rgba(238, 244, 249, 0.5);
  border-radius: 0 0 10px 10px;
}

.node-cell {
  border-right: 1px solid #dde6ef;
  padding: 3px 4px;
  text-align: center;
}

.node-cell:last-child { border-right: none; }

.node-label { color: var(--ink-faint); }

.node-value {
  margin-top: 2px;
  color: #2a3a4f;
}

/* ── Expand button ──────────────────────────────────────────── */
.expand-btn {
  position: absolute;
  top: 50%;
  right: -13px;
  transform: translateY(-50%);
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 2px solid currentColor;
  background: #fff;
  color: var(--teal);
  font-size: 1.1rem;
  font-weight: 700;
  line-height: 1.05;
  padding: 0;
  display: grid;
  place-items: center;
  z-index: 10;
}

.activity-card.critical    .expand-btn { color: var(--critical); }
.activity-card.noncritical .expand-btn { color: var(--noncritical); }

.expand-btn:hover:enabled {
  transform: translateY(-50%) scale(1.08);
  box-shadow: none;
}

/* ── Connector dots ─────────────────────────────────────────── */
.connector-dot {
  position: absolute;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  border: 2px solid var(--teal);
  background: #fff;
  top: 50%;
  transform: translateY(-50%);
}

.connector-dot.in  { left: -7px; }
.connector-dot.out { right: -7px; }

/* ── Empty state ────────────────────────────────────────────── */
.empty-state {
  border: 1.5px dashed #bfd0de;
  border-radius: 12px;
  background: #fff;
  color: var(--ink-soft);
  padding: 18px;
  font-size: 0.88rem;
  line-height: 1.6;
}

/* ── Responsive ─────────────────────────────────────────────── */
@media (max-width: 1060px) {
  .app-frame {
    grid-template-columns: 1fr;
  }

  .left-panel {
    border-right: none;
    border-bottom: 1px solid var(--line-soft);
  }
}

/* ── Print ───────────────────────────────────────────────────── */
@media print {
  @page { margin: 8mm; }

  * {
    -webkit-print-color-adjust: exact !important;
    print-color-adjust: exact !important;
  }

  body.print-only-canvas {
    overflow: visible;
    background: #fff;
  }

  body.print-only-canvas .page-bg,
  body.print-only-canvas .left-panel,
  body.print-only-canvas .top-bar,
  body.print-only-canvas .status,
  body.print-only-canvas .canvas-controls {
    display: none !important;
  }

  body.print-only-canvas .app-frame,
  body.print-only-canvas .main-panel {
    display: block;
    height: auto;
    overflow: visible;
    padding: 0;
    margin: 0;
  }

  body.print-only-canvas .viewer {
    border: none;
    border-radius: 0;
    background: #fff;
    padding: 0;
    margin: 0;
    cursor: default;
  }

  body.print-only-canvas .canvas-content {
    transition: none !important;
    will-change: auto;
  }

  body.print-only-canvas.print-mode-view .viewer {
    page-break-inside: avoid;
    overflow: hidden !important;
  }

  body.print-only-canvas.print-mode-full .viewer {
    overflow: visible !important;
    width: max-content !important;
    height: auto !important;
  }

  body.print-only-canvas.print-mode-full-tiled .app-frame {
    display: none !important;
  }

  body.print-only-canvas.print-mode-full-tiled #printTilesContainer {
    display: block !important;
  }

  #printTilesContainer { display: none; }

  .print-tile {
    page-break-after: always;
    break-after: page;
  }

  .print-tile:last-child {
    page-break-after: auto;
    break-after: auto;
  }

  .print-tile-frame {
    position: relative;
    overflow: hidden;
    background: #fff;
  }

  .print-tile-clone {
    position: absolute;
    left: 0;
    top: 0;
    transform-origin: top left;
  }

  body.print-only-canvas .activity-card {
    opacity: 1 !important;
    transform: none !important;
    animation: none !important;
  }

  body.print-only-canvas .subtree {
    break-inside: avoid;
    page-break-inside: avoid;
  }
}