:root {
  --bg: #0b1220;
  --surface: #131c2e;
  --surface-2: #1a2540;
  --border: #24314f;
  --text: #e6ecff;
  --text-dim: #9aa8c7;
  --text-mute: #6a7796;
  --brand: #0F7FFF;
  --brand-2: #38b6ff;
  --warn: #F59E0B;
  --err: #EF4444;
  --ok: #10B981;
  --radius: 12px;
}
@media (prefers-color-scheme: light) {
  :root {
    --bg: #f4f6fb;
    --surface: #ffffff;
    --surface-2: #f0f3fa;
    --border: #d8def0;
    --text: #0e1730;
    --text-dim: #4a5772;
    --text-mute: #8892ab;
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; background: var(--bg); color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  -webkit-tap-highlight-color: transparent; }
body { min-height: 100vh; padding-bottom: env(safe-area-inset-bottom); }
.topbar { display: flex; justify-content: space-between; align-items: center;
  padding: 12px 16px; background: var(--surface); border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 10; padding-top: calc(12px + env(safe-area-inset-top)); }
.brand { display: flex; align-items: center; gap: 10px; }
.logo { width: 36px; height: 36px; border-radius: 8px; background: linear-gradient(135deg, var(--brand), var(--brand-2));
  display: flex; align-items: center; justify-content: center; font-weight: 800; color: #fff; }
.brand-title { font-weight: 700; font-size: 15px; }
.brand-sub { font-size: 11px; color: var(--text-mute); }
.status { font-size: 11px; color: var(--text-dim); display: flex; align-items: center; gap: 6px; }
.status .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--err); display: inline-block; }
.status .dot.on { background: var(--ok); }
.status .sep { color: var(--text-mute); }
main { max-width: 900px; margin: 0 auto; padding: 12px; display: flex; flex-direction: column; gap: 12px; }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 12px; }
.toolbar { display: flex; flex-wrap: wrap; gap: 8px; }
.btn { min-height: 42px; padding: 0 14px; border-radius: 8px; border: 1px solid var(--border);
  background: var(--surface-2); color: var(--text); font-size: 14px; cursor: pointer; font-weight: 500;
  touch-action: manipulation; }
.btn.primary { background: var(--brand); color: #fff; border-color: transparent; }
.btn.ghost { background: transparent; }
.btn:disabled { opacity: 0.4; }
.btn:active { transform: scale(0.98); }
.canvas-wrap { position: relative; min-height: 260px; display: flex; align-items: center; justify-content: center;
  overflow: hidden; padding: 0; background: #000; }
.canvas-wrap canvas, .canvas-wrap video { max-width: 100%; display: block; cursor: crosshair; }
.canvas-wrap .overlay { position: absolute; top: 0; left: 0; pointer-events: none; }
.placeholder { padding: 32px 20px; text-align: center; color: var(--text-dim); }
.ph-title { font-size: 15px; font-weight: 600; margin-bottom: 4px; color: var(--text); }
.ph-sub { font-size: 13px; margin-bottom: 12px; }
.ph-hint { font-size: 12px; color: var(--text-mute); }
.controls { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
@media (min-width: 640px) { .controls { grid-template-columns: repeat(4, 1fr); } }
.ctrl { display: flex; flex-direction: column; gap: 4px; }
.ctrl label { font-size: 11px; color: var(--text-dim); font-weight: 600; text-transform: uppercase; letter-spacing: 0.5px;
  display: flex; justify-content: space-between; }
.ctrl label .v { font-family: monospace; color: var(--text); font-weight: 500; }
.ctrl input[type=range] { width: 100%; accent-color: var(--brand); }
.ctrl select { padding: 8px; border-radius: 6px; border: 1px solid var(--border);
  background: var(--surface-2); color: var(--text); font-size: 13px; }
.metrics { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
@media (min-width: 640px) { .metrics { grid-template-columns: repeat(6, 1fr); } }
.metric { background: var(--surface); border: 1px solid var(--border); border-radius: 8px; padding: 10px; }
.metric .k { font-size: 10px; color: var(--text-mute); text-transform: uppercase; letter-spacing: 0.5px; }
.metric .v { font-size: 18px; font-weight: 700; font-family: monospace; margin: 2px 0; }
.metric .u { font-size: 10px; color: var(--text-mute); }
.indices { display: flex; flex-direction: column; gap: 6px; }
.idx-bar { display: grid; grid-template-columns: 60px 1fr 60px; gap: 8px; align-items: center; font-size: 12px; }
.idx-bar .name { color: var(--text-dim); font-weight: 600; }
.idx-bar .track { height: 6px; background: var(--surface-2); border-radius: 3px; overflow: hidden; }
.idx-bar .fill { height: 100%; width: 0%; transition: width 0.2s; }
.idx-bar .num { font-family: monospace; text-align: right; }
.gps-card { display: flex; flex-direction: column; gap: 4px; }
.gps-title { font-size: 13px; font-weight: 700; margin-bottom: 6px; }
.gps-row { display: flex; justify-content: space-between; font-size: 12px; padding: 4px 0;
  border-bottom: 1px solid var(--border); }
.gps-row:last-child { border: 0; }
.gps-row span:first-child { color: var(--text-dim); }
.gps-row span:last-child { font-family: monospace; }
.hint { font-size: 12px; color: var(--text-dim); line-height: 1.5; }
.gallery-card { display: flex; flex-direction: column; gap: 10px; }
.gallery-title { font-size: 13px; font-weight: 700; }
.gallery-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; }
@media (min-width: 640px) { .gallery-grid { grid-template-columns: repeat(4, 1fr); } }
.gallery-item { position: relative; border: 2px solid var(--border); border-radius: 8px; overflow: hidden;
  cursor: pointer; background: var(--surface-2); transition: transform 0.1s, border-color 0.2s; }
.gallery-item:hover { border-color: var(--brand); }
.gallery-item:active { transform: scale(0.97); }
.gallery-item.active { border-color: var(--brand); box-shadow: 0 0 0 2px var(--brand); }
.gallery-item img { display: block; width: 100%; height: 90px; object-fit: cover; }
.gallery-item .cat { position: absolute; top: 4px; right: 4px; font-size: 10px; padding: 2px 6px;
  border-radius: 4px; font-weight: 700; color: #fff; }
.gallery-item .cat.positive { background: var(--ok); }
.gallery-item .cat.control  { background: var(--err); }
.gallery-item .lbl { padding: 6px 8px; font-size: 11px; color: var(--text); line-height: 1.3; }
.gallery-empty { padding: 20px; text-align: center; color: var(--text-mute); font-size: 12px; grid-column: 1/-1; }
.gallery-hint { font-size: 11px; color: var(--text-dim); }

/* Usage-limit modal */
.modal-backdrop { position: fixed; inset: 0; background: rgba(4, 8, 18, 0.72);
  display: flex; align-items: center; justify-content: center; z-index: 2000;
  padding: 20px; backdrop-filter: blur(3px); }
.modal { background: var(--surface); border: 1px solid var(--border);
  border-radius: 14px; max-width: 440px; width: 100%; padding: 26px 24px;
  text-align: center; box-shadow: 0 20px 60px rgba(0,0,0,0.45);
  display: flex; flex-direction: column; gap: 14px; align-items: center; }
.modal-logo { width: 52px; height: 52px; border-radius: 12px;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  display: flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: 26px; color: #fff; }
.modal h3 { margin: 0; font-size: 19px; color: var(--text); }
.modal-text { margin: 0; font-size: 13.5px; line-height: 1.6; color: var(--text-dim); }
.modal-text strong { color: var(--text); }
.modal-cta { display: inline-block; text-decoration: none; width: 100%;
  line-height: 42px; font-size: 14px; word-break: break-all; padding: 0 10px; }
.modal-close { width: 100%; }
.modal-foot { font-size: 10.5px; color: var(--text-mute); letter-spacing: 0.4px; }