:root {
  --bg: #14161a;
  --bg-panel: #1c1f25;
  --bg-raised: #262a32;
  --border: #2f343d;
  --text: #e8eaee;
  --text-dim: #9aa1ad;
  --accent: #4f8cff;
  --accent-soft: rgba(79, 140, 255, 0.18);
  --good: #4cc38a;
  --bad: #e5534b;
  --warn: #d4a72c;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font: 13px/1.45 -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  overflow: hidden;
}

/* ---------- top bar ---------- */
#topbar {
  display: flex;
  align-items: center;
  gap: 10px;
  height: 48px;
  padding: 0 14px;
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
}

.brand {
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.06em;
  margin-right: 8px;
}
.brand span { color: var(--accent); font-weight: 400; margin-left: 2px; }

.toolgroup {
  display: flex;
  gap: 4px;
  padding: 3px;
  background: var(--bg-raised);
  border-radius: 8px;
}

button {
  font: inherit;
  color: var(--text);
  background: transparent;
  border: none;
  border-radius: 6px;
  padding: 5px 11px;
  cursor: pointer;
}
button:hover { background: rgba(255, 255, 255, 0.07); }

.tool.active, .toggle.active {
  background: var(--accent);
  color: #fff;
}

.spacer { flex: 1; }

.stat {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  line-height: 1.15;
  min-width: 64px;
}
.stat label { font-size: 10px; color: var(--text-dim); text-transform: uppercase; letter-spacing: 0.07em; }
.stat strong { font-size: 14px; font-variant-numeric: tabular-nums; }

/* ---------- layout ---------- */
#layout {
  display: flex;
  height: calc(100% - 48px);
}

#canvas-wrap {
  position: relative;
  flex: 1;
  min-width: 0;
}
#canvas { display: block; width: 100%; height: 100%; cursor: crosshair; touch-action: none; }

#hint {
  position: absolute;
  left: 12px;
  bottom: 12px;
  padding: 6px 12px;
  background: rgba(20, 22, 26, 0.85);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-dim);
  pointer-events: none;
  max-width: 70%;
}

/* ---------- right panel ---------- */
#panel {
  width: 330px;
  flex: none;
  overflow-y: auto;
  background: var(--bg-panel);
  border-left: 1px solid var(--border);
}

#panel-left {
  width: 300px;
  flex: none;
  overflow-y: auto;
  background: var(--bg-panel);
  border-right: 1px solid var(--border);
}

.gen-controls {
  display: flex;
  align-items: center;
  gap: 8px;
}
.gen-controls label { color: var(--text-dim); font-size: 12px; }
.gen-controls select {
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  padding: 5px 6px;
  font: inherit;
}
.gen-controls #btn-play { flex: 1; }
#gen-status { margin: 8px 0 0; min-height: 16px; }
#gen-status.done { color: var(--good); }

.alt-card .edited-tag {
  position: absolute;
  top: 9px;
  right: 9px;
  background: var(--warn);
  color: #14161a;
  border-radius: 5px;
  padding: 1px 5px;
  font-size: 9px;
  font-weight: 700;
}

.panel-section {
  padding: 14px 14px 16px;
  border-bottom: 1px solid var(--border);
}
.panel-section h2 {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 10px;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-dim);
}
.panel-section h2 .mini { margin-left: auto; }
.panel-section h2 .mini + .mini { margin-left: 0; }

.mini {
  font-size: 11px;
  padding: 3px 8px;
  background: var(--bg-raised);
  border: 1px solid var(--border);
}
.wide {
  width: 100%;
  margin-top: 10px;
  padding: 8px;
  background: var(--bg-raised);
  border: 1px solid var(--border);
}
.wide:disabled { opacity: 0.4; cursor: default; }

.help { margin: 0 0 8px; color: var(--text-dim); font-size: 11.5px; }

/* program rows */
.room-row {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 5px 0;
}
.room-swatch {
  width: 14px; height: 14px;
  border-radius: 4px;
  flex: none;
}
.room-row input[type="text"] {
  flex: 1;
  min-width: 0;
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  padding: 4px 7px;
  font: inherit;
}
.room-row input[type="number"] {
  width: 56px;
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  padding: 4px 5px;
  font: inherit;
}
.room-row .unit { color: var(--text-dim); font-size: 11px; }
.room-row .sun {
  opacity: 0.25;
  cursor: pointer;
  padding: 2px 4px;
}
.room-row .sun.on { opacity: 1; }
.room-row .del { color: var(--text-dim); padding: 2px 6px; }
.room-row .del:hover { color: var(--bad); }
.room-row.fixed .del { visibility: hidden; }

.program-summary {
  margin-top: 8px;
  font-size: 11.5px;
  color: var(--text-dim);
}
.program-summary strong { color: var(--text); }

/* adjacency matrix */
#adj-matrix-wrap { overflow-x: auto; }
#adj-matrix { border-collapse: collapse; }
#adj-matrix th {
  font-size: 9.5px;
  font-weight: 500;
  color: var(--text-dim);
  padding: 2px 3px;
  max-width: 54px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  text-align: left;
}
#adj-matrix th.col {
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  max-height: 60px;
  vertical-align: bottom;
}
#adj-matrix td {
  width: 22px; height: 22px;
  text-align: center;
  border: 1px solid var(--border);
  cursor: pointer;
  font-size: 12px;
  user-select: none;
}
#adj-matrix td:hover { background: var(--accent-soft); }
#adj-matrix td.diag { background: var(--bg-raised); cursor: default; }
.adj-req, td.req { color: var(--good); }
.adj-avoid, td.avoid { color: var(--bad); }
.adj-none { color: var(--text-dim); }

/* weight sliders */
.weight-row {
  display: grid;
  grid-template-columns: 92px 1fr 34px;
  align-items: center;
  gap: 8px;
  padding: 4px 0;
}
.weight-row label { color: var(--text-dim); font-size: 12px; }
.weight-row output { text-align: right; font-variant-numeric: tabular-nums; font-size: 11.5px; }
input[type="range"] { width: 100%; accent-color: var(--accent); }

/* alternatives */
#alt-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}
.alt-card {
  position: relative;
  background: var(--bg-raised);
  border: 2px solid transparent;
  border-radius: 8px;
  padding: 5px;
  cursor: pointer;
}
.alt-card.selected { border-color: var(--accent); }
.alt-card canvas { display: block; width: 100%; border-radius: 5px; background: #fff; }
.alt-card .alt-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 4px;
  font-size: 11px;
  color: var(--text-dim);
}
.alt-card .alt-score { color: var(--text); font-weight: 600; font-variant-numeric: tabular-nums; }
.alt-card .rank-badge {
  position: absolute;
  top: 9px; left: 9px;
  background: rgba(20, 22, 26, 0.8);
  border-radius: 5px;
  padding: 1px 6px;
  font-size: 10px;
  font-weight: 700;
}
.alt-card input[type="checkbox"] { accent-color: var(--accent); }

/* breakdown bars (used in cards & compare) */
.bk-table { width: 100%; border-collapse: collapse; margin-top: 8px; }
.bk-table td { padding: 2px 4px; font-size: 11.5px; }
.bk-bar {
  height: 7px;
  border-radius: 4px;
  background: var(--bg-raised);
  overflow: hidden;
}
.bk-bar > div { height: 100%; background: var(--good); }

/* compare modal */
#compare-modal {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 50;
}
#compare-modal.hidden { display: none; }
.compare-card {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  max-width: 940px;
  width: 92%;
}
.compare-card header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}
.compare-card h2 { margin: 0; font-size: 15px; }
.compare-body { display: flex; gap: 14px; }
.compare-col { flex: 1; min-width: 0; }
.compare-col canvas { width: 100%; background: #fff; border-radius: 8px; }

/* ---------- nav, views, pages ---------- */
.hidden { display: none !important; }

.nav-btn.active, .view-btn.active { background: var(--accent); color: #fff; }

#canvas3d {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  cursor: grab;
  touch-action: none;
}

.page {
  position: absolute;
  inset: 0;
  z-index: 20;
  background: var(--bg);
  overflow-y: auto;
}
#layout { position: relative; }
.page-inner { max-width: 980px; margin: 0 auto; padding: 26px 20px 60px; }
.page-head {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}
.page-head h1 { font-size: 19px; margin: 0; flex: 1; }
button.primary { background: var(--accent); color: #fff; }

#project-grid, #family-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 12px;
  margin-top: 14px;
}
.proj-card, .fam-card {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px;
}
.proj-card canvas, .proj-card img { width: 100%; border-radius: 6px; background: #fff; display: block; }
.proj-card .proj-meta { display: flex; align-items: center; margin-top: 8px; gap: 6px; }
.proj-card .proj-meta strong { flex: 1; font-size: 12.5px; }
.proj-card .proj-meta span { color: var(--text-dim); font-size: 11px; }
.proj-card .proj-actions { display: flex; gap: 6px; margin-top: 8px; }
.proj-card .proj-actions button { flex: 1; font-size: 11.5px; background: var(--bg-raised); border: 1px solid var(--border); }

.fam-card h3 { margin: 0 0 4px; font-size: 13px; display: flex; align-items: center; gap: 7px; }
.fam-card h3 .room-swatch { width: 12px; height: 12px; }
.fam-card .fam-dims { color: var(--text-dim); font-size: 11.5px; }
.fam-card .fam-rules { margin-top: 6px; font-size: 11px; color: var(--text-dim); line-height: 1.5; }
.fam-card .fam-rules code { color: var(--text); background: var(--bg-raised); padding: 0 4px; border-radius: 4px; }
.fam-card .custom-tag { color: var(--accent); font-size: 10px; text-transform: uppercase; letter-spacing: 0.06em; }

#family-json {
  width: 100%;
  background: var(--bg-raised);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px;
  font: 12px/1.5 ui-monospace, monospace;
  margin-top: 12px;
}
#family-import-actions { margin-top: 8px; display: flex; align-items: center; gap: 10px; }
#import-error { color: var(--bad); font-size: 12px; }

/* layer tree */
.layer-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 3px 0;
  font-size: 12.5px;
  cursor: pointer;
  user-select: none;
}
.layer-row input[type="checkbox"] { accent-color: var(--accent); }
.layer-row input:disabled + span { opacity: 0.4; }

/* issues panel */
#issue-list { margin: 0; padding-left: 18px; color: var(--text-dim); font-size: 12px; }
#issue-list li { margin: 3px 0; }
#issue-list li.ok { color: var(--good); list-style: none; margin-left: -18px; }

/* room type select */
.room-row select {
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  padding: 4px 2px;
  font: inherit;
  max-width: 86px;
}

/* compare "why" box */
.why-box {
  margin-top: 10px;
  padding: 9px 11px;
  background: var(--bg-raised);
  border-radius: 8px;
  font-size: 12px;
  line-height: 1.6;
}
.why-box strong { display: block; margin-bottom: 3px; }

/* ---------- phones / small screens ---------- */
@media (max-width: 800px) {
  #topbar {
    overflow-x: auto;
    flex: none;
    gap: 8px;
    padding: 0 8px;
  }
  #topbar .stat { display: none; }
  #topbar .stat:first-of-type { display: flex; } /* keep the score */
  .brand { display: none; }

  #layout { flex-direction: column; }
  #canvas-wrap { flex: none; height: 52vh; order: 0; }
  #panel-left {
    width: 100%;
    flex: none;
    order: 1;
    border-right: none;
    border-top: 1px solid var(--border);
    overflow-y: visible;
  }
  #panel {
    width: 100%;
    flex: 1;
    order: 2;
    border-left: none;
    border-top: 1px solid var(--border);
  }
  #hint { font-size: 11px; max-width: 90%; }
  .compare-body { flex-direction: column; }
}

/* scrollbars */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 6px; }
::-webkit-scrollbar-track { background: transparent; }