/* ── Reset / base ───────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:         #0d0d1a;
  --panel:      #1a1a2e;
  --panel2:     #16213e;
  --border:     #2a2a4a;
  --accent:     #4fc3f7;
  --accent2:    #81d4fa;
  --text:       #e0e0f0;
  --text-dim:   #8888aa;
  --roi-1:      #ff6b6b;
  --roi-2:      #ffd93d;
  --roi-3:      #6bcb77;
  --roi-4:      #4d96ff;
  --radius:     8px;
}

html, body {
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: 'Segoe UI', system-ui, sans-serif;
  font-size: 14px;
  line-height: 1.5;
}

/* ── Header ─────────────────────────────────────────────────────────────── */
header {
  padding: 16px 24px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
}
header h1 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.04em;
}

/* ── Main layout ─────────────────────────────────────────────────────────── */
main {
  max-width: 900px;
  margin: 0 auto;
  padding: 12px 16px 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

/* ── Controls ────────────────────────────────────────────────────────────── */
.controls {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 16px;
  padding: 12px 14px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.control-group label {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-dim);
}

select {
  background: var(--panel2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 6px 10px;
  font-size: 13px;
  cursor: pointer;
  min-width: 140px;
}
select:focus { outline: 2px solid var(--accent); }

.btn-group { flex-direction: row; align-items: center; gap: 8px; }

button {
  background: var(--panel2);
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 5px;
  padding: 6px 16px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}
button:hover:not(:disabled) {
  background: var(--accent);
  color: var(--bg);
}
button:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.toggle-label {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  font-size: 13px;
  color: var(--text);
  margin-top: 14px;
}
.toggle-label input[type="checkbox"] { accent-color: var(--accent); width: 15px; height: 15px; }

/* ── Controls separator & inline proc groups ───────────────────────── */
.controls-sep {
  flex-basis: 100%;
  height: 1px;
  background: var(--border);
  margin: 2px 0;
}

.proc-group {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 14px;
}

.proc-divider {
  width: 1px;
  height: 18px;
  background: var(--border);
  align-self: center;
}

.proc-group .toggle-label { margin-top: 0; }

.proc-group-label {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-dim);
  white-space: nowrap;
}

.proc-hint {
  font-size: 11px;
  color: var(--text-dim);
  margin-left: 2px;
}

/* ── Loading bar ─────────────────────────────────────────────────────────── */
#loading-bar-wrap {
  position: relative;
  height: 28px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
#loading-bar-inner {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  transition: width 0.1s ease;
}
#loading-label {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 12px;
  font-weight: 600;
  color: var(--text);
  pointer-events: none;
}

/* ── Viewer ──────────────────────────────────────────────────────────────── */
.viewer-wrap {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.canvas-stack {
  position: relative;
  display: inline-block;
  width: 100%;
  background: #000;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  line-height: 0;
}

#canvas-video,
#canvas-overlay {
  display: block;
  width: 100%;
  height: auto;
  image-rendering: pixelated;
}

#canvas-overlay {
  position: absolute;
  top: 0;
  left: 0;
  cursor: crosshair;
}

/* ── Frame scrubber ───────────────────────────────────────────────────── */
#frame-scrubber {
  width: 100%;
  margin: 8px 0 4px;
  accent-color: var(--accent);
  cursor: pointer;
  height: 4px;
  /* reset default appearance so accent-color takes effect cross-browser */
  -webkit-appearance: none;
  appearance: none;
  background: var(--border);
  border-radius: 2px;
  outline: none;
}
#frame-scrubber::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: 2px solid var(--bg);
  box-shadow: 0 0 4px rgba(79,195,247,0.5);
}
#frame-scrubber::-moz-range-thumb {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: 2px solid var(--bg);
}
#frame-scrubber:disabled {
  opacity: 0.25;
  cursor: not-allowed;
}

.frame-info {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  color: var(--text-dim);
  padding: 0 4px;
}
#status-msg { color: var(--accent); font-weight: 600; }

/* ── Chart section ───────────────────────────────────────────────────────── */
#chart-section {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 14px;
}
#chart-section h2 {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 8px;
}
.chart-wrap {
  position: relative;
  height: 240px;
}

/* ── Spot info popup ─────────────────────────────────────────────── */
#spot-popup {
  position: fixed;
  z-index: 200;
  min-width: 230px;
  max-width: 290px;
  background: var(--panel2);
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  box-shadow: 0 6px 28px rgba(0,0,0,0.65);
  display: none;
  font-size: 12px;
}
#spot-popup.visible { display: block; }

.popup-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 7px 12px;
  background: var(--border);
  border-radius: var(--radius) var(--radius) 0 0;
}
.popup-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.04em;
}
.popup-close {
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 14px;
  cursor: pointer;
  padding: 0;
  line-height: 1;
  transition: color 0.1s;
}
.popup-close:hover { color: var(--text); background: none; }

.popup-body { padding: 8px 12px 10px; }

.popup-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 10px;
  padding: 4px 0;
  border-bottom: 1px solid var(--border);
}
.popup-row:last-child { border-bottom: none; }
.popup-key {
  color: var(--text-dim);
  white-space: nowrap;
  flex-shrink: 0;
}
.popup-val {
  color: var(--text);
  text-align: right;
  word-break: break-word;
}