/* ===== Base ===== */
:root {
  --bg1: #0a0e1a;
  --bg2: #131a2e;
  --neon: #00e5ff;
  --neon2: #ff2bd6;
  --panel: rgba(255, 255, 255, 0.05);
  --border: rgba(0, 229, 255, 0.35);
  --text: #e8f4ff;
  --dim: #7d8db0;
}

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

html, body {
  height: 100%;
  overscroll-behavior: none;
  touch-action: manipulation;
}

body {
  background: radial-gradient(ellipse at 50% 0%, var(--bg2) 0%, var(--bg1) 70%);
  color: var(--text);
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  display: flex;
  justify-content: center;
  -webkit-user-select: none;
  user-select: none;
}

#app {
  width: 100%;
  max-width: 560px;
  padding: 10px 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-height: 100%;
}

/* ===== Topbar ===== */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: 22px;
  font-weight: 800;
  letter-spacing: 3px;
  text-shadow: 0 0 12px var(--neon);
}
.logo .accent { color: var(--neon2); text-shadow: 0 0 12px var(--neon2); }

.icon-btn {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 18px;
  padding: 6px 10px;
  cursor: pointer;
  color: var(--text);
}
.icon-btn:active { transform: scale(0.94); }

/* ===== Layout ===== */
.layout {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  justify-content: center;
  flex: 1;
}

.panel {
  display: flex;
  flex-direction: column;
  gap: 10px;
  width: 96px;
}

.panel-box {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 8px;
  text-align: center;
}
.panel-box h2 {
  font-size: 11px;
  letter-spacing: 2px;
  color: var(--dim);
  margin-bottom: 6px;
}
.panel-box canvas {
  width: 100%;
  height: auto;
}

.stats { display: flex; flex-direction: column; gap: 6px; }
.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}
.stat .label { font-size: 10px; letter-spacing: 1.5px; color: var(--dim); }
.stat span:last-child {
  font-size: 18px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  text-shadow: 0 0 8px rgba(0, 229, 255, 0.6);
}

/* ===== Board ===== */
.board-wrap { flex: 0 1 auto; }

.board-frame {
  position: relative;
  border: 2px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 0 24px rgba(0, 229, 255, 0.25), inset 0 0 30px rgba(0, 229, 255, 0.06);
  background: rgba(0, 0, 0, 0.35);
}

#board { display: block; width: min(300px, 52vw); height: auto; }

/* ===== Overlay ===== */
.overlay {
  position: absolute;
  inset: 0;
  background: rgba(5, 8, 18, 0.82);
  backdrop-filter: blur(3px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 5;
}
.overlay.hidden { display: none; }

.overlay-content { text-align: center; padding: 20px; }
.overlay-content h2 {
  font-size: 26px;
  letter-spacing: 3px;
  margin-bottom: 8px;
  text-shadow: 0 0 16px var(--neon);
}
.overlay-content p { color: var(--dim); margin-bottom: 18px; font-size: 14px; }

.btn-primary {
  background: linear-gradient(135deg, var(--neon), #0077ff);
  border: none;
  color: #04121a;
  font-weight: 800;
  font-size: 17px;
  letter-spacing: 2px;
  padding: 12px 34px;
  border-radius: 999px;
  cursor: pointer;
  box-shadow: 0 0 18px rgba(0, 229, 255, 0.55);
}
.btn-primary:active { transform: scale(0.95); }

/* ===== Touch controls ===== */
.touch-controls {
  display: none;
  flex-direction: column;
  gap: 8px;
}

.tc-row { display: flex; gap: 8px; justify-content: center; }

.tc-btn {
  flex: 1;
  max-width: 110px;
  min-height: 56px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  font-size: 20px;
  font-weight: 700;
  cursor: pointer;
  touch-action: manipulation;
}
.tc-btn:active {
  background: rgba(0, 229, 255, 0.25);
  transform: scale(0.96);
}
.tc-wide { flex: 2; }

/* ===== Hint ===== */
.hint {
  text-align: center;
  font-size: 11px;
  color: var(--dim);
  padding-bottom: 4px;
}

/* ===== Móvil ===== */
@media (max-width: 640px) {
  #app { max-width: 100%; padding: 8px 8px 10px; gap: 8px; }
  .logo { font-size: 18px; }
  .layout { gap: 8px; }
  .panel { width: 74px; }
  .panel-box { padding: 6px; }
  .panel-box canvas { width: 100%; }
  #hold-canvas { max-height: 60px; }
  #next-canvas { max-height: 100px; }
  .stat span:last-child { font-size: 15px; }
  #board { width: min(72vw, 300px); }
  .touch-controls { display: flex; }
  .hint { display: none; }
}

@media (max-height: 640px) and (max-width: 640px) {
  /* teléfono en horizontal: tablero más compacto */
  #board { width: min(46vh, 240px); }
  .panel { width: 64px; }
  .tc-btn { min-height: 44px; }
}