:root {
  color-scheme: dark light;
  --bg: #14161a;
  --panel: #1c1f25;
  --panel-2: #22262d;
  --border: #33383f;
  --text: #eef0f3;
  --text-dim: #9aa1ab;
  --accent: #5b9fe0;
  --accent-2: #4fd699;
  --danger: #e0607a;
  --radius: 12px;
  font-size: 16px;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f4f5f7;
    --panel: #ffffff;
    --panel-2: #eef0f3;
    --border: #d7dae0;
    --text: #191b1e;
    --text-dim: #5b626c;
  }
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.app-header {
  padding: 1.5rem clamp(1rem, 4vw, 2.5rem) 0.5rem;
  text-align: center;
}

.app-header h1 {
  margin: 0 0 0.25rem;
  font-size: clamp(1.3rem, 2.6vw, 1.9rem);
}

.subtitle {
  margin: 0;
  color: var(--text-dim);
  font-size: 0.95rem;
}

.app-main {
  flex: 1;
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem clamp(0.75rem, 4vw, 2.5rem) 2rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
  justify-content: space-between;
}

.controller-switch {
  display: flex;
  gap: 0.4rem;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.3rem;
}

.controller-switch button {
  border: none;
  background: transparent;
  color: var(--text-dim);
  padding: 0.5rem 1.1rem;
  border-radius: 999px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}

.controller-switch button:hover {
  color: var(--text);
}

.controller-switch button[aria-selected="true"] {
  background: var(--accent);
  color: #0c1622;
}

.toolbar-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.btn {
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  padding: 0.55rem 1rem;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}

.btn:hover {
  border-color: var(--accent);
}

.btn-small {
  padding: 0.4rem 0.8rem;
  font-size: 0.85rem;
}

.btn-danger {
  color: var(--danger);
}

.btn-danger:hover {
  border-color: var(--danger);
}

.workspace {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(280px, 1fr);
  gap: 1.25rem;
  align-items: start;
}

@media (max-width: 820px) {
  .workspace {
    grid-template-columns: 1fr;
  }
}

.diagram-pane {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: clamp(0.75rem, 2vw, 1.5rem);
  position: sticky;
  top: 1rem;
}

@media (max-width: 820px) {
  .diagram-pane {
    position: static;
  }
}

.callout-wrap {
  position: relative;
  display: flex;
  align-items: stretch;
}

.callout-col {
  position: relative;
  flex: 0 0 132px;
  width: 132px;
}

.callout-wrap.no-callouts .callout-col {
  display: none;
}

.diagram-frame {
  position: relative;
  flex: 1 1 auto;
  min-width: 0;
  /* aspect-ratio is set per controller in app.js to match its source photo */
  aspect-ratio: 1000 / 600;
  background: var(--panel-2);
  border-radius: var(--radius);
  overflow: hidden;
}

.diagram-frame img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  user-select: none;
  -webkit-user-drag: none;
}

.pin-layer {
  position: absolute;
  inset: 0;
}

.leader-svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  overflow: visible;
  pointer-events: none;
}

.leader-svg line {
  stroke: var(--text-dim);
  stroke-width: 1.5;
  stroke-dasharray: 2 4;
  stroke-linecap: round;
}

.leader-svg line.active {
  stroke: var(--accent);
}

.hint-text {
  margin: 0.75rem 0 0;
  color: var(--text-dim);
  font-size: 0.85rem;
  text-align: center;
}

.dot {
  position: absolute;
  transform: translate(-50%, -50%);
  width: 16px;
  height: 16px;
  padding: 0;
  border-radius: 50%;
  border: 2px dashed var(--text-dim);
  background: rgba(20, 22, 26, 0.55);
  cursor: pointer;
}

.dot:hover,
.dot:focus-visible {
  border-color: var(--accent);
  outline: none;
}

.dot.filled {
  border-style: solid;
  border-color: var(--accent-2);
  background: var(--accent-2);
}

.dot.active {
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 35%, transparent);
}

.callout-label {
  position: absolute;
  transform: translateY(-50%);
  max-width: 124px;
  padding: 0.3rem 0.6rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.callout-left .callout-label {
  right: 0;
  text-align: right;
}

.callout-right .callout-label {
  left: 0;
  text-align: left;
}

.callout-label:hover,
.callout-label:focus-visible {
  border-color: var(--accent);
  outline: none;
}

.callout-label.active {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 35%, transparent);
}

.group-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.group {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.9rem 1rem;
}

.group h2 {
  margin: 0 0 0.6rem;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-dim);
}

.field-row {
  display: grid;
  grid-template-columns: minmax(90px, auto) 1fr;
  align-items: center;
  gap: 0.6rem;
  padding: 0.35rem 0;
}

.field-row label {
  font-size: 0.85rem;
  color: var(--text-dim);
}

.field-row input {
  width: 100%;
  padding: 0.45rem 0.6rem;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--text);
  font-size: 0.9rem;
}

.field-row input:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.field-row.active-row {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 8px;
}

.popover {
  position: fixed;
  z-index: 50;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
  padding: 0.75rem;
  width: min(260px, 90vw);
}

.popover-title {
  display: block;
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-bottom: 0.35rem;
}

.popover input[type="text"] {
  width: 100%;
  padding: 0.5rem 0.6rem;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--text);
  font-size: 0.95rem;
}

.popover-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.5rem;
  margin-top: 0.6rem;
}

.app-footer {
  text-align: center;
  color: var(--text-dim);
  font-size: 0.8rem;
  padding: 1rem;
}