@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@400;700;900&family=Noto+Sans+KR:wght@400;700&display=swap');

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

:root {
  --bg: #0d0d1a;
  --bg2: #1a1a2e;
  --bg3: #16213e;
  --accent: #e94560;
  --accent2: #0f3460;
  --text: #e0e0e0;
  --text-dim: #888;
  --border: #2a2a4e;
  --glow: 0 0 10px rgba(233, 69, 96, 0.5);
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Noto Sans KR', sans-serif;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow-x: hidden;
}

/* ===== BACKGROUND SLIDER ===== */
#bg-slider {
  position: fixed;
  inset: 0;
  z-index: 0;
  overflow: hidden;
}

.bg-slide {
  position: absolute;
  inset: 0;
  /* 세로형 중앙 — 전체 높이 꽉 채우고 가로는 자연스럽게 */
  background-size: cover;
  background-position: center center;
  opacity: 0;
  transition: opacity 2s ease-in-out;
  filter: saturate(1.15) brightness(0.9);
}
.bg-slide.active { opacity: 1; }

/* 위로 이동 */
@keyframes bgMoveUp {
  0%   { transform: scale(1.02) translateY(2%); }
  100% { transform: scale(1.02) translateY(-2%); }
}
/* 아래로 이동 */
@keyframes bgMoveDown {
  0%   { transform: scale(1.02) translateY(-2%); }
  100% { transform: scale(1.02) translateY(2%); }
}
/* 오른쪽으로 이동 */
@keyframes bgMoveRight {
  0%   { transform: scale(1.02) translateX(-2.5%); }
  100% { transform: scale(1.02) translateX(2.5%); }
}
/* 왼쪽으로 이동 */
@keyframes bgMoveLeft {
  0%   { transform: scale(1.02) translateX(2.5%); }
  100% { transform: scale(1.02) translateX(-2.5%); }
}
/* 확대 (줌인) */
@keyframes bgZoomIn {
  0%   { transform: scale(0.98); }
  100% { transform: scale(1.05); }
}
/* 축소 (줌아웃) */
@keyframes bgZoomOut {
  0%   { transform: scale(1.05); }
  100% { transform: scale(0.98); }
}
/* 대각선 ↗ */
@keyframes bgDiag1 {
  0%   { transform: scale(1.02) translate(-2%, 2%); }
  100% { transform: scale(1.02) translate(2%, -2%); }
}
/* 대각선 ↙ */
@keyframes bgDiag2 {
  0%   { transform: scale(1.02) translate(2%, -2%); }
  100% { transform: scale(1.02) translate(-2%, 2%); }
}

#bg-overlay {
  position: fixed;
  inset: 0;
  z-index: 1;
  background:
    /* 좌우 강하게 어둡게 */
    linear-gradient(90deg,
      rgba(13,13,26,0.96) 0%,
      rgba(13,13,26,0.55) 18%,
      rgba(13,13,26,0.15) 35%,
      rgba(13,13,26,0.15) 65%,
      rgba(13,13,26,0.55) 82%,
      rgba(13,13,26,0.96) 100%
    ),
    /* 상하 비네팅 */
    linear-gradient(180deg,
      rgba(13,13,26,0.65) 0%,
      rgba(13,13,26,0.2) 30%,
      rgba(13,13,26,0.2) 70%,
      rgba(13,13,26,0.75) 100%
    );
}

/* 도트 패턴 */
#bg-dots {
  position: fixed;
  inset: 0;
  z-index: 2;
  background-image: radial-gradient(circle, rgba(255,255,255,0.18) 1px, transparent 1px);
  background-size: 28px 28px;
  pointer-events: none;
  /* 도트도 서서히 움직임 */
  animation: dotsDrift 30s linear infinite;
}
@keyframes dotsDrift {
  0%   { background-position: 0 0; }
  100% { background-position: 28px 28px; }
}

/* 모든 screen이 bg 위에 표시되도록 */
.screen { position: relative; z-index: 3; }

/* ===== SCREENS ===== */
.screen { display: none; width: 100%; min-height: 100vh; align-items: center; justify-content: center; }
.screen.active { display: flex; }

/* ===== MENU ===== */
.menu-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  padding: 40px 32px;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 16px;
  min-width: 320px;
}

.menu-logo {
  display: flex;
  justify-content: center;
  margin-bottom: 4px;
}
.techuni-logo {
  height: 90px;
  width: auto;
  filter: drop-shadow(0 0 10px rgba(255,255,255,0.3));
  animation: logoPulse 3s ease-in-out infinite;
}
@keyframes logoPulse {
  0%, 100% { filter: drop-shadow(0 0 6px rgba(255,255,255,0.2)); }
  50%       { filter: drop-shadow(0 0 16px rgba(255,255,255,0.5)); }
}

.game-title {
  font-family: 'Noto Sans KR', sans-serif;
  font-size: 1.7rem;
  font-weight: 900;
  color: var(--accent);
  text-shadow: var(--glow);
  text-align: center;
  letter-spacing: -0.5px;
}

.nickname-wrap input {
  width: 100%;
  padding: 12px 16px;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: 1rem;
  font-family: 'Noto Sans KR', sans-serif;
  outline: none;
  text-align: center;
  transition: border-color 0.2s;
}
.nickname-wrap input:focus { border-color: var(--accent); }
.nickname-wrap input::placeholder { color: var(--text-dim); }

.menu-buttons { display: flex; flex-direction: column; gap: 10px; width: 100%; }

.desc { color: var(--text-dim); font-size: 0.9rem; text-align: center; line-height: 1.6; }

.controls-hint {
  display: flex; flex-wrap: wrap; gap: 8px; justify-content: center;
  font-size: 0.75rem; color: var(--text-dim); margin-top: 8px;
}
.controls-hint span {
  background: var(--bg3);
  padding: 3px 8px;
  border-radius: 4px;
  border: 1px solid var(--border);
}

/* ===== BUTTONS ===== */
.btn {
  padding: 12px 24px;
  border: none;
  border-radius: 8px;
  font-size: 0.95rem;
  font-family: 'Noto Sans KR', sans-serif;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.15s;
  width: 100%;
}
.btn:disabled { opacity: 0.4; cursor: not-allowed; }

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: var(--glow);
}
.btn-primary:hover:not(:disabled) { background: #ff6b80; transform: translateY(-1px); }

.btn-secondary {
  background: var(--bg3);
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-secondary:hover:not(:disabled) { border-color: var(--accent); color: var(--accent); }

.btn-battle {
  background: var(--accent2);
  color: var(--text);
  border: 1px solid #1a4a80;
}
.btn-battle:hover:not(:disabled) { background: #1a4a80; transform: translateY(-1px); }

.btn-sm { padding: 8px 16px; font-size: 0.8rem; width: auto; }

/* ===== GAME LAYOUT ===== */
.game-layout {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 20px;
}

.canvas-wrap {
  position: relative;
  flex-shrink: 0;
}

#game-canvas {
  display: block;
  border: 1px solid rgba(80, 80, 140, 0.4);
  border-radius: 4px;
  background: transparent;
}

/* ===== SIDE PANELS ===== */
.side-panel {
  display: flex;
  flex-direction: column;
  gap: 16px;
  width: 130px;
}

.info-box {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px;
  text-align: center;
}
.info-label {
  font-family: 'Orbitron', monospace;
  font-size: 0.65rem;
  color: var(--text-dim);
  letter-spacing: 2px;
  margin-bottom: 4px;
}
.info-value {
  font-family: 'Orbitron', monospace;
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--accent);
}

#next-canvas {
  display: block;
  background: var(--bg3);
  border-radius: 4px;
  margin: 0 auto;
}

.battle-badge { background: var(--bg2); border: 1px solid #1a4a80; border-radius: 8px; padding: 10px; text-align: center; }
.battle-room { font-family: 'Orbitron', monospace; font-size: 1.2rem; color: #4a9eff; font-weight: 700; letter-spacing: 3px; }
.mute-btn { width: 100%; font-size: 1.1rem; }

/* ===== OVERLAY ===== */
.overlay {
  position: absolute;
  inset: 0;
  background: rgba(13, 13, 26, 0.92);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  border-radius: 4px;
}
.overlay.hidden { display: none; }

.overlay-text {
  font-family: 'Orbitron', monospace;
  font-size: 1.8rem;
  font-weight: 900;
  color: var(--accent);
  text-shadow: var(--glow);
}

.final-score { font-size: 1.1rem; color: var(--text-dim); }
#final-score-val { font-family: 'Orbitron', monospace; font-size: 1.8rem; color: var(--text); font-weight: 700; }

.overlay .btn { width: 180px; }

/* ===== MOBILE CONTROLS ===== */
.mobile-controls { display: none; flex-direction: column; gap: 6px; margin-top: 8px; }
.mobile-row { display: flex; gap: 6px; justify-content: center; }
.mbtn {
  background: var(--bg3);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 8px;
  width: 44px; height: 44px;
  font-size: 1.1rem;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: background 0.1s;
  -webkit-tap-highlight-color: transparent;
}
.mbtn:active { background: var(--accent2); }
.mbtn-wide { width: 120px; font-size: 0.7rem; font-weight: 700; }

/* ===== RANKING ===== */
.ranking-container {
  display: flex; flex-direction: column; align-items: center; gap: 20px;
  padding: 40px 32px;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 16px;
  min-width: 360px;
}
.ranking-container h2 {
  font-family: 'Orbitron', monospace;
  color: var(--accent);
  font-size: 1.5rem;
}

.ranking-list { width: 100%; }
.ranking-item {
  display: flex; align-items: center; gap: 12px;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  font-size: 0.9rem;
}
.ranking-item:last-child { border-bottom: none; }
.rank-num {
  font-family: 'Orbitron', monospace;
  font-size: 1rem; font-weight: 700;
  width: 28px; text-align: center; color: var(--text-dim);
}
.rank-num.gold { color: #ffd700; }
.rank-num.silver { color: #c0c0c0; }
.rank-num.bronze { color: #cd7f32; }
.rank-nick { flex: 1; font-weight: 700; }
.rank-score { font-family: 'Orbitron', monospace; color: var(--accent); font-weight: 700; }
.rank-meta { font-size: 0.75rem; color: var(--text-dim); }

.loading { color: var(--text-dim); text-align: center; padding: 20px; }

/* ===== ROOM CODE ===== */
.room-code-box {
  background: var(--bg3); border: 1px solid #1a4a80;
  border-radius: 8px; padding: 16px; text-align: center; width: 100%;
}
.room-code-val {
  font-family: 'Orbitron', monospace; font-size: 2rem; font-weight: 900;
  color: #4a9eff; letter-spacing: 6px; margin: 8px 0;
}

.code-input {
  padding: 14px 20px;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: 1.5rem;
  font-family: 'Orbitron', monospace;
  outline: none;
  text-align: center;
  letter-spacing: 6px;
  width: 100%;
  text-transform: uppercase;
  transition: border-color 0.2s;
}
.code-input:focus { border-color: #4a9eff; }

/* ===== BATTLE RESULT ===== */
.battle-result { width: 100%; }
.result-row {
  display: flex; justify-content: space-between; align-items: center;
  padding: 16px; background: var(--bg3); border-radius: 8px; margin-bottom: 10px;
  border: 2px solid transparent;
}
.result-row.winner { border-color: #ffd700; background: rgba(255, 215, 0, 0.08); }
.result-row.loser { opacity: 0.7; }
.result-row.waiting { border-color: var(--border); }
.result-nick { font-size: 1rem; font-weight: 700; }
.result-score { font-family: 'Orbitron', monospace; font-size: 1.3rem; color: var(--accent); }
.result-badge { font-size: 0.8rem; color: #ffd700; font-weight: 700; }
.result-waiting { font-size: 0.8rem; color: var(--text-dim); }
.vs-divider { text-align: center; font-family: 'Orbitron', monospace; font-weight: 700; color: var(--text-dim); margin: 4px 0; }

.hidden { display: none !important; }

/* ===== RESPONSIVE ===== */
@media (max-width: 600px) {
  .game-layout { flex-direction: column; align-items: center; padding: 10px; gap: 10px; }
  .side-panel { flex-direction: row; width: 300px; }
  .left-panel { order: 2; }
  .canvas-wrap { order: 1; }
  .right-panel { order: 3; width: 300px; }
  .mobile-controls { display: flex; }
  .btn-pause { display: none; }
  .controls-hint { display: none; }
  .info-box { flex: 1; }
}