:root {
  --bg: #ffffff;
  --panel: #ffffff;
  --border: #e5e5e5;
  --border-strong: #d4d4d4;
  --fg: #0a0a0a;
  --muted: #737373;
  --accent: #0a0a0a;
  --input-bg: #fafafa;
  --hover: #f5f5f5;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--fg);
  font-family: ui-sans-serif, -apple-system, "Segoe UI", "Hiragino Sans",
    "Noto Sans JP", system-ui, sans-serif;
  font-size: 13px;
  -webkit-font-smoothing: antialiased;
}

.topbar {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
}
.topbar-inner {
  display: flex;
  align-items: center;
  gap: 16px;
  max-width: 1800px;
  margin: 0 auto;
  padding: 0 0;
}
.topbar h1 { line-height: 1; flex: 1; }
.topbar h1 {
  font-size: 13px;
  font-weight: 600;
  margin: 0;
  letter-spacing: 0.02em;
}
.muted { color: var(--muted); font-size: 12px; }

.layout {
  position: relative;
  padding: 12px;
  height: calc(100vh - 46px);
}

.viewports {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  height: 100%;
  max-width: 1800px;
  margin: 0 auto;
  transition: padding-right 0.2s ease;
}
body.panel-open .viewports { padding-right: 352px; }

@media (max-width: 1100px) {
  .viewports {
    grid-template-columns: 1fr;
    grid-template-rows: 1fr 1fr;
  }
  body.panel-open .viewports { padding-right: 0; }
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-height: 0;
}
.panel .canvas-wrap { flex: 1 1 auto; min-height: 0; }
.panel-head {
  display: flex;
  justify-content: space-between;
  padding: 8px 12px;
  border-bottom: 1px solid var(--border);
  font-size: 12px;
  color: var(--fg);
}
.canvas-wrap {
  position: relative;
  flex: 1;
  min-height: 0;
}
.canvas-wrap canvas { display: block; width: 100%; height: 100%; }

.camera-view {
  background: #fafafa;
}

.cam-stats {
  flex: 0 0 auto;
  background: #fafafa;
  border-top: 1px solid var(--border);
  padding: 10px 12px;
  font-variant-numeric: tabular-nums;
}
.cam-stats dl {
  margin: 0;
  display: grid;
  grid-template-columns: repeat(4, auto 1fr);
  gap: 4px 16px;
  font-size: 11px;
}
.cam-stats dt {
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-size: 10px;
  align-self: center;
}
.cam-stats dd {
  margin: 0;
  color: var(--fg);
  font-weight: 500;
}

@media (max-width: 1300px) {
  .cam-stats dl { grid-template-columns: repeat(2, auto 1fr); }
}

.controls {
  position: fixed;
  top: 46px;
  right: 0;
  bottom: 0;
  width: 340px;
  background: var(--bg);
  border-left: 1px solid var(--border);
  padding: 14px;
  overflow-y: auto;
  transform: translateX(100%);
  transition: transform 0.2s ease;
  z-index: 5;
}
body.panel-open .controls { transform: translateX(0); }

.panel-toggle {
  position: fixed;
  top: 56px;
  right: 12px;
  z-index: 10;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--input-bg);
  color: var(--fg);
  border: 1px solid var(--border-strong);
  border-radius: 6px;
  font-size: 14px;
  line-height: 1;
  cursor: pointer;
  font-family: inherit;
  flex-shrink: 0;
}
.panel-toggle:hover { background: var(--hover); }
.group {
  margin-bottom: 18px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border);
}
.group:last-child { border-bottom: none; margin-bottom: 0; padding-bottom: 0; }
.dof-controls.disabled {
  opacity: 0.45;
  pointer-events: none;
}
.group.triple .triple-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}
.group.triple .triple-row label { margin-bottom: 0; gap: 4px; }
.group.triple .triple-row .row {
  flex-direction: column;
  align-items: stretch;
  gap: 4px;
}
.group.triple .triple-row input[type="number"] { width: 100%; min-width: 0; }
.group.triple .triple-row input[type="range"] {
  width: 100%;
  height: 14px;
  margin: 0;
}
.group h2 {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin: 0 0 10px;
}
label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 10px;
  font-size: 12px;
}
label > span:first-child { color: var(--muted); }
.row {
  display: flex;
  align-items: center;
  gap: 8px;
}
.unit { color: var(--muted); font-size: 11px; }

input[type="range"] {
  flex: 1;
  accent-color: var(--accent);
  background: transparent;
}
input[type="number"], select {
  width: 70px;
  background: var(--input-bg);
  color: var(--fg);
  border: 1px solid var(--border-strong);
  border-radius: 4px;
  padding: 4px 6px;
  font-size: 12px;
  font-family: inherit;
}
select { width: 100%; padding: 6px 8px; }
input[type="number"]:focus, select:focus {
  outline: none;
  border-color: #a3a3a3;
}

.btn {
  width: 100%;
  padding: 8px 12px;
  background: var(--input-bg);
  color: var(--fg);
  border: 1px solid var(--border-strong);
  border-radius: 6px;
  font-size: 12px;
  font-family: inherit;
  cursor: pointer;
}
.btn:hover { background: var(--hover); border-color: #a3a3a3; }

label.check {
  flex-direction: row;
  align-items: center;
  gap: 8px;
}
label.check span { color: var(--fg); }
input[type="checkbox"] { accent-color: var(--accent); }

.field { display: flex; flex-direction: column; gap: 6px; margin-bottom: 10px; }
.field-label { color: var(--muted); font-size: 12px; }
.seg {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 4px;
}
.seg-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 6px 4px;
  background: var(--input-bg);
  color: var(--fg);
  border: 1px solid var(--border-strong);
  border-radius: 4px;
  font-size: 11px;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  text-align: center;
}
.seg-item small {
  color: var(--muted);
  font-size: 9px;
  font-weight: 400;
}
.seg-item:hover { background: var(--hover); }
.seg-item.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.seg-item.active small { color: rgba(255,255,255,0.7); }

.preset-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 4px;
  margin-top: 6px;
}
.preset-row.cols-8 { grid-template-columns: repeat(4, 1fr); }
.preset-row button {
  padding: 4px 0;
  background: var(--input-bg);
  color: var(--fg);
  border: 1px solid var(--border-strong);
  border-radius: 4px;
  font-size: 11px;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
}
.preset-row button:hover { background: var(--hover); }
.preset-row button.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.overlay-slider {
  position: absolute;
  z-index: 3;
  margin: 0;
  accent-color: var(--accent);
  background: transparent;
  cursor: pointer;
}
.overlay-pan {
  /* Position set dynamically from fitCamView() to track the canvas edges. */
  height: 18px;
}
.overlay-tilt {
  /* Vertical slider — tilt up = top, down = bottom. */
  width: 18px;
  writing-mode: vertical-lr;
  direction: rtl;
  -webkit-appearance: slider-vertical;
  appearance: slider-vertical;
}

.view-presets {
  position: absolute;
  right: 8px;
  bottom: 8px;
  display: flex;
  gap: 4px;
  z-index: 2;
}
.view-presets button {
  padding: 4px 8px;
  background: rgba(255,255,255,0.92);
  color: var(--fg);
  border: 1px solid var(--border-strong);
  border-radius: 4px;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.05em;
  font-family: inherit;
  cursor: pointer;
  backdrop-filter: blur(4px);
}
.view-presets button:hover { background: #fff; }