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

html,
body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #000;
  font-family: "Hiragino Kaku Gothic ProN", "Noto Sans JP", sans-serif;
}

#stage {
  position: fixed;
  inset: 0;
}

#video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scaleX(-1); /* 鏡映し */
}

#canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

/* 技名の表示 */
#kanji {
  position: absolute;
  left: 50%;
  top: 18%;
  transform: translateX(-50%);
  white-space: nowrap;
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-weight: 900;
  color: #e8d6ff;
  pointer-events: none;
  user-select: none;
  z-index: 10;
}

#kanji.charge {
  font-size: clamp(18px, 3.5vw, 42px);
  text-shadow: 0 0 12px #7b2fff, 0 0 30px #4a0a99;
  animation: pulse 0.7s ease-in-out infinite alternate;
}

#kanji.fire {
  font-size: clamp(26px, 6.5vw, 88px);
  color: #f4eaff;
  text-shadow:
    0 0 10px #b06bff,
    0 0 40px #7b2fff,
    0 0 90px #2a0055;
  animation: slam 0.25s ease-out;
}

@keyframes pulse {
  from { opacity: 0.55; transform: translateX(-50%) scale(0.97); }
  to   { opacity: 1;    transform: translateX(-50%) scale(1.03); }
}

@keyframes slam {
  0%   { opacity: 0; transform: translateX(-50%) scale(2.2); }
  100% { opacity: 1; transform: translateX(-50%) scale(1); }
}

#guide {
  position: absolute;
  left: 50%;
  bottom: 4%;
  transform: translateX(-50%);
  padding: 8px 20px;
  border-radius: 999px;
  background: rgba(0, 0, 0, 0.45);
  color: #ddd;
  font-size: 15px;
  white-space: nowrap;
  pointer-events: none;
  z-index: 10;
}

/* 起動前オーバーレイ */
#overlay {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: radial-gradient(ellipse at center, #14001f 0%, #000 80%);
  color: #eee;
  z-index: 100;
  text-align: center;
}

#overlay.hidden {
  display: none;
}

#overlay-inner h1 {
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: clamp(36px, 8vw, 80px);
  color: #d9c2ff;
  text-shadow: 0 0 18px #7b2fff, 0 0 60px #38006b;
  margin-bottom: 24px;
}

#overlay-inner p {
  line-height: 1.9;
  margin-bottom: 28px;
  color: #bbb;
}

#start {
  font-size: 20px;
  padding: 14px 48px;
  border: 1px solid #8a4dff;
  border-radius: 999px;
  background: linear-gradient(180deg, #2a0a4d, #12002a);
  color: #e8d6ff;
  cursor: pointer;
  text-shadow: 0 0 8px #7b2fff;
  transition: transform 0.15s, box-shadow 0.15s;
}

#start:hover {
  transform: scale(1.05);
  box-shadow: 0 0 24px #7b2fff88;
}

#loading,
#error {
  margin-top: 20px;
  font-size: 14px;
}

#error {
  color: #ff7a7a;
}

.hidden {
  display: none !important;
}