:root {
  --bg: #0b0b0f;
  --fg: #f4f4f6;
  --muted: #9aa0aa;
  --accent: #4f8cff;
  --accent-2: #33d29b;
  --chip-bg: rgba(22, 22, 28, 0.92);
  --chip-br: rgba(255, 255, 255, 0.14);
  --safe-t: env(safe-area-inset-top, 0px);
  --safe-b: env(safe-area-inset-bottom, 0px);
  --safe-l: env(safe-area-inset-left, 0px);
  --safe-r: env(safe-area-inset-right, 0px);
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

/* Class rules that set `display` would otherwise defeat the `hidden` attribute. */
[hidden] { display: none !important; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--fg);
  font: 15px/1.45 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  overscroll-behavior: none;
}

body { position: fixed; inset: 0; overflow: hidden; }

.screen { position: absolute; inset: 0; display: none; }
.screen.is-active { display: block; }

/* ---------- buttons ---------- */
.btn {
  appearance: none;
  border: 1px solid var(--chip-br);
  background: var(--chip-bg);
  color: var(--fg);
  border-radius: 999px;
  padding: 12px 20px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
}
.btn:active { transform: scale(0.97); }
.btn-primary { background: var(--accent); border-color: transparent; color: #fff; }
.btn-lg { padding: 15px 26px; font-size: 17px; }

.chip {
  appearance: none;
  border: 1px solid var(--chip-br);
  background: var(--chip-bg);
  color: var(--fg);
  border-radius: 999px;
  padding: 9px 14px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
}
.chip:active { transform: scale(0.96); }
.chip-accent { color: var(--accent-2); }

/* ---------- start screen ---------- */
#screen-start {
  display: none;
  place-items: center;
  padding: calc(24px + var(--safe-t)) 22px calc(24px + var(--safe-b));
  overflow-y: auto;
}
#screen-start.is-active { display: grid; }
.start-card { max-width: 440px; text-align: center; }
.logo { color: var(--accent); width: 96px; margin: 0 auto 10px; }
.logo svg { width: 100%; display: block; }
h1 { font-size: 30px; margin: 0 0 8px; letter-spacing: -0.02em; }
.tagline { color: var(--muted); margin: 0 0 22px; }
.note { color: var(--accent-2); min-height: 1.2em; margin: 14px 0 0; font-size: 13px; }
.note.err { color: #ff6b6b; }
.tips { margin-top: 26px; text-align: left; color: var(--muted); font-size: 13px; }
.tips summary { cursor: pointer; color: var(--fg); font-weight: 600; }
.tips ul { margin: 10px 0 0; padding-left: 18px; }
.tips li { margin: 6px 0; }
.version { margin: 22px 0 0; font-size: 11px; color: var(--muted); opacity: 0.65; }

/* ---------- capture screen ---------- */
#cam {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  object-fit: cover;
  background: #000;
}

.hud { position: absolute; inset: 0; pointer-events: none; }
.guide { position: absolute; inset: 0; width: 100%; height: 100%; }
.reticle {
  position: absolute; left: 50%; top: 50%;
  width: 54px; height: 54px;
  margin: -27px 0 0 -27px;
  border: 2px solid rgba(255, 255, 255, 0.9);
  border-radius: 50%;
}
.reticle::before, .reticle::after {
  content: ""; position: absolute; background: rgba(255, 255, 255, 0.9);
}
.reticle::before { left: 50%; top: -10px; width: 2px; height: 10px; margin-left: -1px; }
.reticle::after { top: 50%; left: -10px; height: 2px; width: 10px; margin-top: -1px; }

.cap-top {
  position: absolute; left: 0; right: 0;
  top: calc(10px + var(--safe-t));
  padding: 0 calc(12px + var(--safe-l)) 0 calc(12px + var(--safe-r));
  display: flex; align-items: center; justify-content: space-between;
  gap: 8px;
}
.coverage { font-variant-numeric: tabular-nums; color: var(--accent-2); }

.hint {
  position: absolute; left: 50%; top: calc(58px + var(--safe-t));
  transform: translateX(-50%);
  background: var(--chip-bg);
  border: 1px solid var(--chip-br);
  border-radius: 999px;
  padding: 6px 14px;
  font-size: 12px;
  color: var(--muted);
  white-space: nowrap;
}

.cap-bottom {
  position: absolute; left: 0; right: 0;
  bottom: calc(18px + var(--safe-b));
  display: flex; align-items: center; justify-content: space-around;
  gap: 12px;
  padding: 0 18px;
}
.shutter {
  width: 74px; height: 74px;
  border-radius: 50%;
  border: 4px solid #fff;
  background: rgba(255, 255, 255, 0.25);
  cursor: pointer;
  flex: 0 0 auto;
}
.shutter:active { transform: scale(0.92); background: rgba(255, 255, 255, 0.5); }
.shutter.flash { animation: flash 0.28s ease; }
@keyframes flash { 0% { box-shadow: 0 0 0 0 rgba(255,255,255,0.9);} 100% { box-shadow: 0 0 0 40px rgba(255,255,255,0);} }

.gl-mini {
  position: absolute;
  right: calc(10px + var(--safe-r));
  bottom: calc(108px + var(--safe-b));
  width: 132px; height: 66px;
  border-radius: 8px;
  border: 1px solid var(--chip-br);
  background: #111;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.45);
}

.panel {
  position: absolute;
  left: calc(12px + var(--safe-l)); right: calc(12px + var(--safe-r));
  bottom: calc(108px + var(--safe-b));
  background: rgba(14, 14, 20, 0.97);
  border: 1px solid var(--chip-br);
  border-radius: 16px;
  padding: 16px;
  display: none;
}
.panel.is-open { display: block; }
.panel label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 8px; }
.panel .row { display: flex; align-items: center; gap: 8px; margin-top: 12px; color: var(--fg); }
.panel input[type=range] { width: 100%; margin-bottom: 6px; accent-color: var(--accent); }
.panel select { background: var(--chip-bg); color: var(--fg); border: 1px solid var(--chip-br); border-radius: 8px; padding: 4px 8px; }
.panel .btn { margin-top: 14px; width: 100%; }
#fov-val { color: var(--fg); font-weight: 700; }
.panel .req { color: var(--accent-2); font-weight: 600; }
.substat {
  margin: 6px 0 0; font-size: 11px; line-height: 1.35;
  color: var(--muted); word-break: break-word;
}
.substat.ok { color: var(--accent-2); }
.substat.err { color: #ff8080; }

.sim-banner {
  position: absolute; left: 50%; bottom: calc(190px + var(--safe-b));
  transform: translateX(-50%);
  background: rgba(79, 140, 255, 0.16);
  border: 1px solid rgba(79, 140, 255, 0.5);
  color: #cfe0ff;
  padding: 7px 14px; border-radius: 999px; font-size: 12px; white-space: nowrap;
}

/* ---------- review screen ---------- */
.gl-full-slot { position: absolute; inset: 0; background: #000; }
canvas.gl-full { position: absolute; inset: 0; width: 100%; height: 100%; background: #000; touch-action: none; }
canvas.gl-mini {
  position: absolute;
  right: calc(10px + var(--safe-r));
  bottom: calc(108px + var(--safe-b));
  width: 132px; height: 66px;
  border-radius: 8px;
  border: 1px solid var(--chip-br);
  background: #111;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.45);
}
.review-hint {
  position: absolute; left: 50%; bottom: calc(96px + var(--safe-b));
  transform: translateX(-50%);
  color: var(--muted); font-size: 12px;
  background: var(--chip-bg); border: 1px solid var(--chip-br);
  padding: 6px 14px; border-radius: 999px;
}
.stitch-diag {
  position: absolute; left: 8px; right: 8px;
  bottom: calc(150px + var(--safe-b));
  margin: 0; padding: 8px 10px;
  font: 10px/1.35 ui-monospace, Menlo, monospace;
  color: var(--muted); white-space: pre-wrap; word-break: break-word;
  background: rgba(8, 8, 12, 0.9);
  border: 1px solid var(--chip-br); border-radius: 8px;
  max-height: 30vh; overflow: auto;
}
.stitch-diag.err { color: #ffb3b3; border-color: rgba(255, 120, 120, 0.5); }
.debug-chip {
  position: absolute; left: 8px; bottom: calc(112px + var(--safe-b));
  font-size: 11px; opacity: 0.9;
}

.review-bottom { flex-direction: column; gap: 10px; }
.review-bottom .btn { width: min(420px, 100%); }
.export-status {
  position: absolute; inset: 0;
  display: grid; place-items: center;
  background: rgba(8, 8, 12, 0.94);
  font-size: 15px; color: var(--fg);
}

/* ---------- toast ---------- */
.toast {
  position: absolute; left: 50%; bottom: calc(24px + var(--safe-b));
  transform: translateX(-50%);
  background: #1b1b24; border: 1px solid var(--chip-br);
  padding: 10px 16px; border-radius: 10px;
  font-size: 13px; max-width: 88vw; text-align: center;
  z-index: 50;
}