:root {
  --bg-a: #071726;
  --bg-b: #0f2b1e;
  --panel: rgba(5, 12, 22, 0.78);
  --line: rgba(255, 255, 255, 0.15);
  --text: #ebfff8;
  --accent: #4cff8a;
  --warn: #ffd36a;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  background:
    radial-gradient(1200px 700px at 20% 5%, #15395f 0%, transparent 60%),
    radial-gradient(1200px 700px at 100% 100%, #1a4a26 0%, transparent 58%),
    linear-gradient(130deg, var(--bg-a), var(--bg-b));
  font-family: "Trebuchet MS", "Segoe UI", sans-serif;
}

.layout {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 16px;
  padding: 16px;
}

.hud {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 16px;
  backdrop-filter: blur(6px);
}

.hud h1 {
  margin: 0 0 8px;
  letter-spacing: 1px;
}

.hud p {
  margin: 0 0 16px;
  color: rgba(235, 255, 248, 0.86);
}

.stats {
  display: grid;
  gap: 8px;
  margin-bottom: 14px;
}

.mode-label {
  display: block;
  font-size: 13px;
  margin-bottom: 6px;
  color: rgba(235, 255, 248, 0.9);
}

.mode-select {
  width: 100%;
  margin-bottom: 12px;
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: 10px;
  padding: 10px;
  background: rgba(9, 20, 32, 0.95);
  color: #ebfff8;
  font-weight: 700;
}

#startBtn {
  width: 100%;
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: 12px;
  padding: 12px;
  color: #061409;
  background: linear-gradient(180deg, #79ffad, #37d36f);
  font-weight: 800;
  cursor: pointer;
}

#startBtn:hover {
  filter: brightness(1.05);
}

.game-wrap {
  position: relative;
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid var(--line);
  min-height: calc(100vh - 34px);
  background: rgba(0, 0, 0, 0.28);
}

#gameCanvas {
  width: 100%;
  height: 100%;
  display: block;
}

#inputVideo {
  display: none;
}

#cameraPreview {
  position: absolute;
  right: 12px;
  top: 12px;
  width: 200px;
  height: 150px;
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 10px;
  transform: scaleX(-1);
  opacity: 0.8;
  background: rgba(0, 0, 0, 0.5);
}

#status {
  position: absolute;
  left: 12px;
  top: 12px;
  border-radius: 10px;
  background: rgba(3, 10, 20, 0.65);
  border: 1px solid rgba(255, 255, 255, 0.18);
  padding: 8px 10px;
  font-size: 14px;
}

#debugPanel {
  position: absolute;
  left: 12px;
  bottom: 12px;
  width: 280px;
  background: rgba(3, 10, 20, 0.75);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 10px;
  padding: 8px;
}

#debugToggleWrap {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: #c3ffde;
  user-select: none;
}

#debugToggle {
  accent-color: #6bffcc;
}

#debugInfo {
  margin: 8px 0 0;
  color: #f2fff8;
  font-size: 12px;
  line-height: 1.35;
  white-space: pre-wrap;
}

@media (max-width: 900px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .game-wrap {
    min-height: 65vh;
  }

  #cameraPreview {
    width: 130px;
    height: 98px;
  }

  #debugPanel {
    width: 220px;
    font-size: 11px;
  }
}