:root {
  --bg: #10141c;
  --panel: rgba(18, 22, 31, 0.82);
  --border: rgba(255, 255, 255, 0.12);
  --text: #e8edf6;
  --muted: #9aa6b8;
  --accent: #4f9dff;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

#scene {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
}

.hidden { display: none !important; }

/* Crosshair ----------------------------------------------------------------*/
#crosshair {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 22px;
  line-height: 1;
  color: rgba(255, 255, 255, 0.7);
  text-shadow: 0 0 4px rgba(0, 0, 0, 0.6);
  pointer-events: none;
  user-select: none;
  z-index: 20;
}

/* Click-to-start overlay ---------------------------------------------------*/
#blocker {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: radial-gradient(circle at center, rgba(16, 20, 28, 0.55), rgba(16, 20, 28, 0.85));
  cursor: pointer;
  z-index: 10;
}

#prompt {
  text-align: center;
  padding: 32px 40px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 16px;
  backdrop-filter: blur(8px);
  max-width: 90vw;
}

#prompt h1 {
  margin: 0 0 6px;
  font-size: 28px;
  letter-spacing: 0.5px;
}

#prompt .lead {
  margin: 0 0 18px;
  font-size: 16px;
  color: var(--accent);
}

#prompt .keys {
  margin: 0 0 14px;
  font-size: 13px;
  color: var(--muted);
}

#prompt .keys b { color: var(--text); }

#prompt .hint {
  margin: 0;
  font-size: 12px;
  color: var(--muted);
}

#prompt code {
  background: rgba(255, 255, 255, 0.08);
  padding: 1px 5px;
  border-radius: 4px;
  font-size: 11px;
}

/* HUD ----------------------------------------------------------------------*/
#hud {
  position: fixed;
  top: 14px;
  left: 14px;
  padding: 10px 14px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 13px;
  z-index: 15;
  pointer-events: none;
}

#hud .row { line-height: 1.5; }
#hud #mode-label { color: var(--accent); font-weight: 600; }
#hud .sub { color: var(--muted); font-size: 12px; }

/* Toolbar ------------------------------------------------------------------*/
#toolbar {
  position: fixed;
  top: 14px;
  right: 14px;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
  max-width: calc(100vw - 28px);
  z-index: 15;
}

#toolbar button {
  appearance: none;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 13px;
  cursor: pointer;
  backdrop-filter: blur(8px);
  transition: background 0.15s, border-color 0.15s;
}

#toolbar button:hover {
  background: rgba(79, 157, 255, 0.18);
  border-color: var(--accent);
}

#toolbar button.active {
  background: rgba(79, 157, 255, 0.32);
  border-color: var(--accent);
  color: #fff;
  font-weight: 600;
}

#toolbar button:disabled,
#toolbar button.disabled {
  opacity: 0.4;
  cursor: not-allowed;
  filter: grayscale(0.6);
}

#toolbar button:disabled:hover {
  background: var(--panel);
  border-color: var(--border);
}

/* Drop hint ----------------------------------------------------------------*/
#dropzone {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(16, 20, 28, 0.8);
  z-index: 30;
  pointer-events: none;
}

#dropzone div {
  border: 2px dashed var(--accent);
  border-radius: 16px;
  padding: 40px 60px;
  font-size: 20px;
  color: var(--text);
}