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

:root {
  --bg: #0a0a12;
  --panel: #12121f;
  --accent: #00ff88;
  --accent-dim: #00aa55;
  --danger: #ff4466;
  --text: #e8e8f0;
  --text-dim: #8888aa;
  --border: #2a2a44;
  --player-colors: #00ff88, #44aaff, #ffaa44, #ff66aa;
}

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", "Hiragino Sans", "Meiryo", sans-serif;
}

#app {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.screen {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  padding: 1rem;
  gap: 1.25rem;
}

.screen.active {
  display: flex;
}

/* タイトル画面 */
.title-logo {
  font-size: clamp(2rem, 6vw, 3.5rem);
  letter-spacing: 0.15em;
  color: var(--accent);
  text-shadow: 0 0 20px rgba(0, 255, 136, 0.5);
  font-weight: 800;
}

.subtitle {
  color: var(--text-dim);
  font-size: 0.95rem;
}

.menu-group {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem 1.5rem;
  text-align: center;
  min-width: min(90vw, 420px);
}

.menu-group h2 {
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-bottom: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.mode-buttons,
.count-buttons {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  justify-content: center;
}

.btn {
  background: var(--panel);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.6rem 1.2rem;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.95rem;
  transition: border-color 0.15s, background 0.15s;
  touch-action: manipulation;
}

.btn:hover:not(:disabled) {
  border-color: var(--accent-dim);
}

.btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.btn.selected {
  border-color: var(--accent);
  background: rgba(0, 255, 136, 0.1);
  color: var(--accent);
}

.btn-primary {
  background: var(--accent);
  color: #0a0a12;
  border-color: var(--accent);
  font-weight: 700;
  padding: 0.8rem 2.5rem;
  font-size: 1.1rem;
}

.btn-primary:hover {
  background: #33ffaa;
}

.btn-start {
  margin-top: 0.5rem;
}

.mobile-notice {
  margin-top: 0.75rem;
  font-size: 0.8rem;
  color: var(--danger);
}

.controls-help {
  font-size: 0.8rem;
  color: var(--text-dim);
  text-align: center;
  line-height: 1.6;
}

.controls-help h3 {
  font-size: 0.75rem;
  margin-bottom: 0.4rem;
  letter-spacing: 0.08em;
}

.hidden {
  display: none !important;
}

/* ゲーム画面 */
#screen-game {
  padding: 0;
  gap: 0;
  background: #000;
}

#game-hud {
  width: 100%;
  padding: 0.4rem 0.8rem;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-shrink: 0;
  min-height: 36px;
}

#hud-scores {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
  font-size: 0.85rem;
  font-family: "Courier New", monospace;
}

.hud-score-item {
  display: flex;
  gap: 0.4rem;
  align-items: center;
}

.hud-score-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

#hud-mode-label {
  font-size: 0.75rem;
  color: var(--text-dim);
  letter-spacing: 0.05em;
}

#game-container {
  flex: 1;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  position: relative;
}

canvas {
  display: block;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  background: #000;
}

#canvas-main {
  max-width: 100%;
  max-height: 100%;
}

/* 対戦モード分割 */
#versus-grid {
  display: grid;
  width: 100%;
  height: 100%;
  gap: 2px;
  background: var(--border);
}

#versus-grid.split-2 {
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr;
}

#versus-grid.split-3,
#versus-grid.split-4 {
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr 1fr;
}

#versus-grid canvas {
  width: 100%;
  height: 100%;
}

.versus-cell {
  position: relative;
  background: #000;
  overflow: hidden;
}

.versus-cell canvas {
  width: 100%;
  height: 100%;
}

.versus-label {
  position: absolute;
  top: 4px;
  left: 6px;
  font-size: 0.7rem;
  font-family: monospace;
  z-index: 2;
  pointer-events: none;
}

.versus-label.dead {
  color: var(--danger);
}

/* バーチャルパッド */
#virtual-pad {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 1rem;
  display: flex;
  justify-content: center;
  gap: 1rem;
  background: linear-gradient(transparent, rgba(0, 0, 0, 0.8));
  z-index: 100;
}

.vpad-btn {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  border: 2px solid var(--border);
  background: rgba(18, 18, 31, 0.9);
  color: var(--text);
  font-size: 1.4rem;
  cursor: pointer;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
}

.vpad-btn:active,
.vpad-btn.active {
  background: rgba(0, 255, 136, 0.25);
  border-color: var(--accent);
}

.vpad-shoot {
  width: 72px;
  height: 72px;
  font-size: 1.6rem;
  color: var(--accent);
  margin-left: 1rem;
}

/* リザルト画面 */
#screen-result {
  gap: 1.5rem;
}

#result-title {
  font-size: 2rem;
  color: var(--accent);
  letter-spacing: 0.2em;
}

#result-winner {
  font-size: 1.4rem;
  color: #ffdd44;
  text-align: center;
}

#result-scores {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.5rem 2rem;
  min-width: min(90vw, 360px);
  font-family: "Courier New", monospace;
}

.result-row {
  display: flex;
  justify-content: space-between;
  padding: 0.4rem 0;
  border-bottom: 1px solid var(--border);
}

.result-row:last-child {
  border-bottom: none;
}

.result-buttons {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
}

@media (max-width: 768px) {
  .controls-help {
    display: none;
  }

  #player-count-group .count-btn:not([data-count="1"]) {
    display: none;
  }

  .menu-group {
    min-width: 90vw;
  }
}

@media (orientation: landscape) and (max-height: 500px) {
  #virtual-pad {
    padding: 0.5rem;
  }

  .vpad-btn {
    width: 52px;
    height: 52px;
  }

  .vpad-shoot {
    width: 58px;
    height: 58px;
  }
}