* { margin: 0; padding: 0; box-sizing: border-box; }

html, body { width: 100%; height: 100%; overflow: hidden; background: #0b0d12; }

#renderCanvas {
  width: 100%;
  height: 100%;
  display: block;
  touch-action: none;
  outline: none;
}

/* ---- Fadenkreuz ---- */
#crosshair {
  position: fixed;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  color: #fff;
  font: 700 26px/1 system-ui, sans-serif;
  text-shadow: 0 0 4px rgba(0,0,0,.9);
  pointer-events: none;
  opacity: .85;
  z-index: 5;
}

/* ---- HUD ---- */
#hud {
  position: fixed;
  top: 14px; left: 14px;
  color: #e6e9f0;
  font: 500 13px/1.6 system-ui, sans-serif;
  text-shadow: 0 1px 3px rgba(0,0,0,.8);
  pointer-events: none;
  z-index: 5;
}
.hud-key {
  display: inline-block;
  padding: 1px 7px;
  margin: 0 1px;
  border-radius: 5px;
  background: rgba(255,255,255,.14);
  border: 1px solid rgba(255,255,255,.22);
  font-weight: 700;
}
#score { margin-top: 6px; font-weight: 700; color: #7ee0a8; }

/* ---- Overlay ---- */
#overlay {
  position: fixed; inset: 0;
  display: flex; align-items: center; justify-content: center;
  background: radial-gradient(120% 120% at 50% 0%, #1a2030 0%, #0b0d12 70%);
  z-index: 10;
  transition: opacity .25s ease;
}
#overlay.hidden { opacity: 0; pointer-events: none; }

.overlay-card {
  max-width: 440px;
  padding: 34px 30px;
  text-align: center;
  color: #e6e9f0;
  font-family: system-ui, sans-serif;
  background: rgba(20,24,34,.72);
  border: 1px solid rgba(255,255,255,.08);
  border-radius: 18px;
  box-shadow: 0 20px 60px rgba(0,0,0,.55);
  backdrop-filter: blur(6px);
}
.overlay-card h1 { font-size: 40px; letter-spacing: -1px; margin-bottom: 4px; }
.tag { color: #8bd3ff; font-size: 13px; font-weight: 700; text-transform: uppercase; letter-spacing: 1px; margin-bottom: 16px; }
.desc { font-size: 14px; line-height: 1.6; color: #b9c0cf; margin-bottom: 22px; }
.desc b { color: #fff; }

#startBtn {
  appearance: none; border: 0; cursor: pointer;
  padding: 14px 40px;
  font: 700 17px system-ui, sans-serif;
  color: #06210f;
  background: linear-gradient(180deg, #7ee0a8, #46c483);
  border-radius: 12px;
  box-shadow: 0 8px 24px rgba(70,196,131,.35);
  transition: transform .08s ease, filter .2s ease;
}
#startBtn:hover { filter: brightness(1.06); }
#startBtn:active { transform: translateY(1px); }
#startBtn:disabled { opacity: .5; cursor: default; filter: grayscale(.6); }

.hint { margin-top: 16px; font-size: 12px; color: #6b7385; }

/* ---- Modell-Loader / Drop-Zone ---- */
.loader-box {
  margin-top: 18px;
  padding: 16px 14px;
  border: 1.5px dashed rgba(255,255,255,.18);
  border-radius: 12px;
  transition: border-color .15s ease, background .15s ease;
}
.loader-box.dragover {
  border-color: #7ee0a8;
  background: rgba(126,224,168,.08);
}
button.secondary {
  appearance: none; cursor: pointer;
  padding: 10px 18px;
  font: 600 14px system-ui, sans-serif;
  color: #cfe9ff;
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(139,211,255,.35);
  border-radius: 10px;
  transition: background .15s ease;
}
button.secondary:hover { background: rgba(139,211,255,.14); }
.drop-hint { margin-top: 9px; font-size: 11.5px; color: #7a8398; line-height: 1.5; }
.model-status { margin-top: 8px; font-size: 12px; font-weight: 600; color: #7ee0a8; min-height: 1em; }
.model-status.err { color: #ff8a90; }