/* Zone & Conduit Designer - layout chrome. Diagram colours live in the document model. */
:root {
  --bg: #f4f5f7;
  --panel: #ffffff;
  --ink: #1c2430;
  --muted: #5b6572;
  --line: #d5dae1;
  --accent: #1e5aa8;
  --danger: #b3261e;
  --safety: #c62828;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font: 14px/1.45 "Segoe UI", system-ui, -apple-system, sans-serif;
  color: var(--ink);
  background: var(--bg);
}
/* The app fills the first viewport; the about/FAQ content scrolls beneath it. */
#appview {
  height: 100vh;
  height: 100dvh;
  display: flex;
  flex-direction: column;
}

/* ---------- header ---------- */
.top {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 6px 12px;
  background: #22303f;
  color: #e8edf3;
  flex-wrap: wrap;
}
.top h1 { font-size: 15px; font-weight: 600; margin: 0; white-space: nowrap; }
.top .brand { color: #7fb2e5; margin-right: 8px; font-weight: 700; }
.toolbar { display: flex; gap: 6px; align-items: center; flex-wrap: wrap; }
.toolbar .sep { width: 1px; height: 22px; background: #47586b; margin: 0 4px; }
.toolbar button {
  font: inherit;
  padding: 4px 10px;
  border: 1px solid #47586b;
  border-radius: 4px;
  background: #2e3f52;
  color: #e8edf3;
  cursor: pointer;
}
.toolbar button:hover { background: #3a4e65; }
.toolbar button.tool.active { background: var(--accent); border-color: var(--accent); }
.toolbar button:disabled { opacity: 0.45; cursor: default; }

/* ---------- workspace ---------- */
.work { flex: 1; display: flex; min-height: 0; }
.canvas-wrap { flex: 1; position: relative; min-width: 0; }
#canvas { width: 100%; height: 100%; display: block; touch-action: none; outline: none; }
.hint {
  position: absolute;
  top: 10px;
  left: 50%;
  transform: translateX(-50%);
  background: #22303fdd;
  color: #e8edf3;
  padding: 5px 14px;
  border-radius: 4px;
  pointer-events: none;
  font-size: 13px;
}

/* ---------- properties panel ---------- */
.props {
  width: 320px;
  background: var(--panel);
  border-left: 1px solid var(--line);
  overflow-y: auto;
  padding: 12px;
  flex-shrink: 0;
}
.prop-empty p { margin: 0 0 10px; }
.doc-fields label { display: block; font-weight: 600; font-size: 12.5px; }
.doc-fields input, .doc-fields textarea {
  width: 100%;
  font: inherit;
  margin: 2px 0 10px;
  padding: 4px 6px;
  border: 1px solid var(--line);
  border-radius: 4px;
  resize: vertical;
}
.fine { color: var(--muted); font-size: 12px; }
abbr[title] { cursor: help; text-decoration: underline dotted 1px; text-underline-offset: 2px; }
.sl-grid .fr[title] { cursor: help; }
#propForm h2 { font-size: 14px; margin: 0 0 4px; }
#propForm .kind-tag { font-size: 11px; letter-spacing: 0.06em; text-transform: uppercase; color: var(--muted); }
#propForm label { display: block; margin: 10px 0 2px; font-weight: 600; font-size: 12.5px; }
#propForm label .opt { font-weight: 400; color: var(--muted); }
#propForm input[type="text"], #propForm textarea, #propForm select {
  width: 100%;
  font: inherit;
  padding: 4px 6px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: #fff;
  color: var(--ink);
}
#propForm textarea { resize: vertical; min-height: 44px; }
#propForm .check { display: flex; align-items: center; gap: 6px; font-weight: 600; margin: 10px 0 2px; }
#propForm .check input { width: auto; }
.sl-grid { display: grid; grid-template-columns: repeat(7, 1fr); gap: 3px; }
.sl-grid .fr { text-align: center; font-size: 10.5px; color: var(--muted); }
.sl-grid select { padding: 2px; text-align: center; }
.sl-row { display: flex; gap: 6px; align-items: center; margin-top: 4px; }
#propForm .sl-row select { flex: 0 0 auto; width: auto; }
.colour-row { display: flex; gap: 6px; align-items: center; flex-wrap: wrap; margin-top: 4px; }
.colour-row input[type="color"] { width: 40px; height: 26px; padding: 0; border: 1px solid var(--line); border-radius: 4px; background: none; }
.swatch { width: 20px; height: 20px; border-radius: 4px; border: 1px solid #0003; cursor: pointer; padding: 0; }
.assets-list { margin: 6px 0 0; padding: 0; list-style: none; }
.assets-list li { display: flex; gap: 4px; margin-bottom: 4px; }
.assets-list input { flex: 1; min-width: 0; }
.assets-list select { flex: 0 0 96px; }
#propForm .assets-list .asset-colour { flex: 0 0 30px; height: 26px; padding: 0; border: 1px solid var(--line); border-radius: 4px; }
.assets-list .del { flex: 0 0 auto; }
button.small, .assets-list .del {
  font: inherit;
  font-size: 12.5px;
  padding: 3px 8px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: #f2f4f6;
  cursor: pointer;
  color: var(--ink);
}
button.small:hover { background: #e6eaee; }
button.danger, .assets-list .del:hover { border-color: var(--danger); color: var(--danger); }
.prop-actions { display: flex; gap: 6px; margin-top: 14px; flex-wrap: wrap; }

/* ---------- dialogs ---------- */
dialog {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 18px;
  max-width: 460px;
  width: calc(100vw - 40px);
  box-shadow: 0 12px 40px #0004;
}
dialog::backdrop { background: #0006; }
dialog h2 { margin: 0 0 12px; font-size: 16px; }
.dlg-grid { display: flex; flex-direction: column; gap: 8px; }
.dlg-grid button, dialog form button {
  font: inherit;
  padding: 7px 10px;
  border: 1px solid var(--line);
  border-radius: 5px;
  background: #f2f4f6;
  cursor: pointer;
  text-align: left;
  color: var(--ink);
}
.dlg-grid button:hover { background: #e6eaee; }
.dlg-grid .row { display: flex; gap: 8px; }
.dlg-grid .row button { flex: 1; }
.dlg-grid .lbl { font-weight: 600; font-size: 12.5px; margin-top: 6px; }
#savedList { font: inherit; padding: 4px; border: 1px solid var(--line); border-radius: 5px; }
dialog hr { border: none; border-top: 1px solid var(--line); margin: 6px 0; }
dialog .close {
  margin-top: 14px;
  font: inherit;
  padding: 6px 14px;
  border: 1px solid var(--line);
  border-radius: 5px;
  background: #fff;
  cursor: pointer;
}
dialog fieldset { border: 1px solid var(--line); border-radius: 6px; margin: 0 0 10px; }
dialog legend { font-weight: 600; font-size: 13px; padding: 0 4px; }
dialog fieldset label { display: flex; align-items: center; gap: 8px; margin: 6px 0; }
dialog fieldset input[type="color"] { margin-left: auto; width: 64px; height: 28px; }
.help-body { max-height: 60vh; overflow-y: auto; }
.help-body kbd {
  background: #eef1f4;
  border: 1px solid var(--line);
  border-bottom-width: 2px;
  border-radius: 3px;
  padding: 0 5px;
  font-size: 12px;
}

/* ---------- canvas SVG classes ---------- */
.node-shape { cursor: move; }
.node-label { pointer-events: none; user-select: none; }
.asset-box { pointer-events: none; }

/* ---------- tables drawer ---------- */
.drawer[hidden] { display: none; }
.drawer {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  max-height: 46%;
  display: flex;
  flex-direction: column;
  background: var(--panel);
  border-top: 1px solid var(--line);
  box-shadow: 0 -6px 20px #0002;
}
.drawer-bar {
  display: flex;
  gap: 6px;
  align-items: center;
  padding: 6px 10px;
  border-bottom: 1px solid var(--line);
  background: #eef1f4;
}
.drawer-bar .tab {
  font: inherit;
  padding: 4px 12px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: #fff;
  cursor: pointer;
}
.drawer-bar .tab.active { background: var(--accent); border-color: var(--accent); color: #fff; }
.drawer-spacer { flex: 1; }
.drawer-body { overflow: auto; padding: 0 10px 10px; }
.drawer-body table { border-collapse: collapse; width: 100%; font-size: 12.5px; }
.drawer-body th, .drawer-body td {
  text-align: left;
  padding: 4px 10px 4px 0;
  border-bottom: 1px solid #e3e6ea;
  white-space: nowrap;
  max-width: 220px;
  overflow: hidden;
  text-overflow: ellipsis;
}
.drawer-body th { position: sticky; top: 0; background: var(--panel); font-size: 11.5px; text-transform: uppercase; letter-spacing: 0.04em; color: var(--muted); }
.drawer-body tbody tr { cursor: pointer; }
.drawer-body tbody tr:hover { background: #f0f4f8; }
.drawer-body .swatch-cell { width: 14px; height: 14px; border-radius: 3px; border: 1px solid #0002; display: inline-block; vertical-align: -2px; }
.drawer-body .safety-cell { color: var(--safety); font-weight: 700; }
.drawer-body .empty-note { color: var(--muted); padding: 12px 0; }
.conduit-hit { stroke: transparent; stroke-width: 14; fill: none; cursor: pointer; }
.handle { fill: #fff; stroke: var(--accent); stroke-width: 1.5; cursor: nwse-resize; }
.selected-outline { fill: none; stroke: var(--accent); stroke-width: 1.5; stroke-dasharray: 5 3; pointer-events: none; }
.band-line { cursor: ns-resize; }
.band-line-vis { transition: stroke 0.1s; }
.band-line:hover + .band-line-vis { stroke: var(--accent); }
.band-label { fill: #8a94a0; font-size: 13px; user-select: none; pointer-events: none; }
.conduit-pick { outline: 2px solid var(--accent); }

/* ---------- about / FAQ content below the app ---------- */
.seo { background: #ffffff; border-top: 1px solid var(--line); }
.seo-inner { max-width: 760px; margin: 0 auto; padding: 36px 20px 48px; }
.seo h2 { font-size: 20px; margin: 26px 0 10px; }
.seo h2:first-child { margin-top: 0; }
.seo h3 { font-size: 15px; margin: 20px 0 6px; }
.seo p { margin: 0 0 12px; line-height: 1.6; color: #2a3442; }
.seo a { color: var(--accent); }
.seo-footer { margin-top: 28px; font-size: 12.5px; color: var(--muted); }

@media (max-width: 760px) {
  .work { flex-direction: column; }
  .props { width: 100%; max-height: 45vh; border-left: none; border-top: 1px solid var(--line); }
}