/* ===================== RESET & BASE ===================== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --player-color: #4fc3f7;
  --player-dark: #0277bd;
  --cpu-color: #ef5350;
  --cpu-dark: #b71c1c;
  --neutral-color: #78909c;
  --neutral-dark: #37474f;
  --bg-dark: #0a0e1a;
  --bg-mid: #111827;
  --bg-panel: #1a2235;
  --gold: #ffd700;
  --text: #e2e8f0;
  --text-dim: #94a3b8;
  --border: #2d3a4f;
  --font-hud: 'Orbitron', monospace;
  --font-jp: 'Noto Sans JP', sans-serif;
}

body {
  background: var(--bg-dark);
  color: var(--text);
  font-family: var(--font-jp);
  overflow: hidden;
  width: 100vw;
  height: 100vh;
}

/* ===================== SCREENS ===================== */
.screen {
  position: fixed;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  flex-direction: column;
}
.screen.active {
  display: flex;
}

/* ===================== TITLE SCREEN ===================== */
#screen-title {
  background: radial-gradient(ellipse at center, #0d1b2a 0%, #050a12 100%);
  overflow: hidden;
}
.title-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 50%, rgba(79, 195, 247, 0.08) 0%, transparent 50%),
    radial-gradient(circle at 80% 50%, rgba(239, 83, 80, 0.08) 0%, transparent 50%);
  animation: pulse-bg 4s ease-in-out infinite alternate;
}
@keyframes pulse-bg {
  from { opacity: 0.6; }
  to   { opacity: 1; }
}
.title-deco {
  position: absolute;
  border-radius: 50%;
  border: 1px solid rgba(79, 195, 247, 0.15);
  animation: spin-slo 20s linear infinite;
}
.deco-1 { width: 600px; height: 600px; top: -100px; left: -150px; animation-direction: normal; }
.deco-2 { width: 400px; height: 400px; bottom: -80px; right: -100px; animation-direction: reverse; border-color: rgba(239,83,80,0.15); }
@keyframes spin-slo { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }

.title-content {
  position: relative;
  z-index: 10;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
}
.title-logo {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}
.title-en {
  font-family: var(--font-hud);
  font-size: 48px;
  font-weight: 900;
  letter-spacing: 10px;
  background: linear-gradient(135deg, var(--player-color), #82cfff, var(--player-color));
  background-size: 200% auto;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: shimmer 3s linear infinite;
  text-shadow: none;
  filter: drop-shadow(0 0 20px rgba(79,195,247,0.5));
}
.title-en:last-child {
  font-size: 28px;
  letter-spacing: 6px;
  background: linear-gradient(135deg, var(--cpu-color), #ff8a80, var(--cpu-color));
  background-size: 200% auto;
  -webkit-background-clip: text;
  background-clip: text;
  filter: drop-shadow(0 0 20px rgba(239,83,80,0.5));
  animation: shimmer 3s linear infinite reverse;
}
.title-jp {
  font-family: var(--font-hud);
  font-size: 72px;
  font-weight: 900;
  color: var(--gold);
  letter-spacing: 4px;
  text-shadow: 0 0 30px rgba(255,215,0,0.5);
  -webkit-text-fill-color: var(--gold);
}
@keyframes shimmer {
  from { background-position: 200% center; }
  to   { background-position: 0% center; }
}
.title-sub {
  color: var(--text-dim);
  font-size: 16px;
  letter-spacing: 4px;
}

/* ===================== BUTTONS ===================== */
.btn-primary {
  background: linear-gradient(135deg, #1565c0, #0d47a1);
  color: white;
  border: 1px solid var(--player-color);
  padding: 14px 48px;
  font-size: 18px;
  font-family: var(--font-jp);
  font-weight: 700;
  border-radius: 4px;
  cursor: pointer;
  letter-spacing: 2px;
  box-shadow: 0 0 20px rgba(79,195,247,0.3), inset 0 1px 0 rgba(255,255,255,0.1);
  transition: all 0.2s;
  position: relative;
  overflow: hidden;
}
.btn-primary::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(79,195,247,0.1), transparent);
  opacity: 0;
  transition: opacity 0.2s;
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 4px 30px rgba(79,195,247,0.5); }
.btn-primary:hover::before { opacity: 1; }
.btn-primary:active { transform: translateY(0); }

.btn-secondary {
  background: transparent;
  color: var(--text-dim);
  border: 1px solid var(--border);
  padding: 12px 32px;
  font-size: 16px;
  font-family: var(--font-jp);
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.2s;
}
.btn-secondary:hover { border-color: var(--text-dim); color: var(--text); }

.btn-back {
  background: transparent;
  color: var(--text-dim);
  border: 1px solid var(--border);
  padding: 8px 16px;
  font-size: 14px;
  font-family: var(--font-jp);
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.2s;
}
.btn-back:hover { color: var(--text); border-color: var(--text-dim); }

.btn-back-sm {
  background: transparent;
  color: var(--text-dim);
  border: 1px solid var(--border);
  padding: 6px 12px;
  font-size: 12px;
  font-family: var(--font-jp);
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.2s;
}
.btn-back-sm:hover { color: var(--text); border-color: var(--text-dim); }

/* ===================== STAGE SELECT ===================== */
#screen-stage-select {
  background: var(--bg-dark);
  align-items: stretch;
  flex-direction: column;
  padding: 0;
}
.stage-select-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px 40px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-panel);
}
.stage-select-header h1 {
  font-family: var(--font-hud);
  font-size: 22px;
  color: var(--player-color);
  letter-spacing: 4px;
}
.stage-list {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  padding: 48px;
  justify-content: center;
  align-content: flex-start;
  overflow-y: auto;
  flex: 1;
}
.stage-card {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 28px 32px;
  width: 260px;
  cursor: pointer;
  transition: all 0.2s;
  position: relative;
  overflow: hidden;
}
.stage-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--player-color), var(--cpu-color));
  opacity: 0;
  transition: opacity 0.2s;
}
.stage-card:hover { transform: translateY(-4px); border-color: var(--player-color); box-shadow: 0 8px 30px rgba(79,195,247,0.2); }
.stage-card:hover::before { opacity: 1; }
.stage-card.locked { opacity: 0.4; cursor: not-allowed; }
.stage-card.locked:hover { transform: none; border-color: var(--border); box-shadow: none; }
.stage-num {
  font-family: var(--font-hud);
  font-size: 12px;
  color: var(--text-dim);
  letter-spacing: 2px;
  margin-bottom: 8px;
}
.stage-title {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text);
}
.stage-desc {
  font-size: 13px;
  color: var(--text-dim);
  line-height: 1.6;
  margin-bottom: 16px;
}
.stage-info {
  display: flex;
  gap: 12px;
  font-size: 12px;
}
.stage-badge {
  padding: 3px 10px;
  border-radius: 20px;
  border: 1px solid;
  letter-spacing: 1px;
}
.clear-mark {
  color: var(--gold);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 2px;
  background: rgba(255, 215, 0, 0.12);
  border: 1px solid var(--gold);
  border-radius: 10px;
  padding: 2px 8px;
  margin-left: 8px;
  vertical-align: middle;
}
.stage-card.cleared {
  border-color: var(--gold);
  box-shadow: 0 0 12px rgba(255, 215, 0, 0.15);
}
.badge-easy   { color: #66bb6a; border-color: #66bb6a; background: rgba(102,187,106,0.08); }
.badge-normal { color: #ffa726; border-color: #ffa726; background: rgba(255,167,38,0.08); }
.badge-hard   { color: #ef5350; border-color: #ef5350; background: rgba(239,83,80,0.08); }

/* ===================== GAME SCREEN ===================== */
#screen-game {
  flex-direction: column;
  background: var(--bg-dark);
  padding: 0;
  align-items: stretch;
  justify-content: flex-start;
}

#game-hud {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 20px;
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
  height: 60px;
  flex-shrink: 0;
}
.hud-left, .hud-right {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 1;
}
.hud-right { justify-content: flex-end; }
.hud-label {
  font-family: var(--font-hud);
  font-size: 13px;
  color: var(--gold);
  letter-spacing: 2px;
}
.hud-center {
  display: flex;
  align-items: center;
  gap: 24px;
}
.hud-stat {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-family: var(--font-hud);
}
.hud-stat.player { color: var(--player-color); }
.hud-stat.enemy  { color: var(--cpu-color); }
.hud-stat-label { font-size: 11px; color: var(--text-dim); }
.hud-stat-val   { font-size: 20px; font-weight: 700; min-width: 24px; text-align: center; }
.hud-stat-units { font-size: 14px; min-width: 36px; text-align: right; }
.hud-vs {
  font-family: var(--font-hud);
  font-size: 14px;
  color: var(--text-dim);
}
.speed-label {
  font-size: 12px;
  color: var(--text-dim);
  font-family: var(--font-hud);
}
.btn-speed {
  background: transparent;
  color: var(--text-dim);
  border: 1px solid var(--border);
  padding: 4px 10px;
  font-size: 13px;
  font-family: var(--font-hud);
  border-radius: 3px;
  cursor: pointer;
  transition: all 0.15s;
}
.btn-speed:hover { color: var(--text); border-color: var(--text-dim); }
.btn-speed.active { background: rgba(79,195,247,0.15); color: var(--player-color); border-color: var(--player-color); }

#canvas-container {
  flex: 1;
  position: relative;
  min-height: 0;
  overflow: hidden;
}
#game-canvas {
  display: block;
  width: 100%;
  height: 100%;
  cursor: pointer;
}
#hint-text {
  position: absolute;
  bottom: 16px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(10,14,26,0.75);
  color: var(--text-dim);
  font-size: 13px;
  padding: 6px 16px;
  border-radius: 20px;
  border: 1px solid var(--border);
  white-space: nowrap;
  pointer-events: none;
  transition: opacity 0.5s;
}

/* ===================== RESULT SCREENS ===================== */
#screen-clear, #screen-gameover {
  background: rgba(10,14,26,0.95);
  backdrop-filter: blur(8px);
}
.result-content {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  padding: 60px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--bg-panel);
  max-width: 480px;
  width: 90%;
}
.result-content.clear { border-color: var(--gold); box-shadow: 0 0 40px rgba(255,215,0,0.2); }
.result-content.gameover { border-color: var(--cpu-color); box-shadow: 0 0 40px rgba(239,83,80,0.2); }

.result-badge {
  font-family: var(--font-hud);
  font-size: 22px;
  letter-spacing: 4px;
  padding: 10px 24px;
  border-radius: 4px;
}
.clear .result-badge  { color: var(--gold); background: rgba(255,215,0,0.1); border: 1px solid var(--gold); }
.gameover .result-badge { color: var(--cpu-color); background: rgba(239,83,80,0.1); border: 1px solid var(--cpu-color); }

.result-content h2 { font-size: 20px; color: var(--text-dim); }
.result-msg { font-size: 15px; color: var(--text-dim); }
.result-buttons { display: flex; gap: 16px; flex-wrap: wrap; justify-content: center; }