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

body {
  font-family: 'Outfit', sans-serif;
  background: #0a0f1e;
  color: #fff;
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.bg {
  display: flex;
  flex-direction: column;
  height: 100%;
  background:
    radial-gradient(ellipse 80% 50% at 20% 20%, rgba(96,165,250,0.05) 0%, transparent 60%),
    radial-gradient(ellipse 60% 40% at 80% 80%, rgba(125,220,95,0.04) 0%, transparent 55%),
    #0a0f1e;
}

/* NAV */
nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 24px;
  border-bottom: 1px solid rgba(255,255,255,0.07);
  background: rgba(0,0,0,0.3);
  backdrop-filter: blur(10px);
  flex-shrink: 0;
}
.back-btn { font-size:13px; font-weight:600; color:rgba(255,255,255,0.5); text-decoration:none; transition:color .2s; }
.back-btn:hover { color:#fff; }
.nav-title { font-size:16px; font-weight:800; color:#fff; }
.nav-right { width: 60px; }

/* SCREENS */
.screen {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 20px;
  gap: 28px;
}
.hidden { display: none !important; }

/* MENU */
.menu-title {
  font-size: clamp(28px, 5vw, 48px);
  font-weight: 800;
  letter-spacing: -1px;
}

.menu-btns {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  justify-content: center;
}

.menu-btn {
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.14);
  border-radius: 14px;
  color: #fff;
  font-family: 'Outfit', sans-serif;
  font-size: 15px;
  font-weight: 700;
  padding: 18px 36px;
  cursor: pointer;
  transition: background .15s, border-color .15s, transform .1s;
  text-align: center;
  line-height: 1.5;
  min-width: 160px;
}
.menu-btn small { font-size: 12px; font-weight: 400; color: rgba(255,255,255,0.45); display: block; }
.menu-btn:hover { background: rgba(255,255,255,0.12); border-color: rgba(255,255,255,0.28); transform: translateY(-2px); }
.menu-btn.outline { background: transparent; }

.menu-controls {
  display: flex;
  gap: 32px;
}
.ctrl-box { text-align: center; }
.ctrl-title { font-size: 12px; font-weight: 600; color: rgba(255,255,255,0.4); text-transform: uppercase; letter-spacing: 1px; margin-bottom: 6px; }
.ctrl-keys { font-size: 14px; }
kbd {
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: 6px;
  padding: 3px 8px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
}

/* GAME SCREEN */
#screen-game {
  gap: 8px;
  justify-content: flex-start;
  padding: 10px 16px;
  overflow: hidden;
}

.scoreboard {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: 900px;
  padding: 0 8px;
  flex-shrink: 0;
}
.score-side { text-align: center; min-width: 100px; }
.score-name { font-size: 11px; font-weight: 600; color: rgba(255,255,255,0.45); text-transform: uppercase; letter-spacing: 1px; }
.score-val  { font-family: 'JetBrains Mono', monospace; font-size: 36px; font-weight: 700; line-height: 1; }
.score-mid  { text-align: center; }
.score-set  { font-size: 11px; color: rgba(255,255,255,0.3); }

.pause-hint {
  font-size: 15px;
  font-weight: 700;
  color: #f5c842;
  min-height: 22px;
  margin-top: 2px;
}

canvas {
  border-radius: 12px;
  border: 1px solid rgba(255,255,255,0.08);
  display: block;
  width: 100%;
  max-width: min(860px, 100%);
  max-height: calc(100vh - 160px);
  aspect-ratio: 860 / 473;
  object-fit: contain;
}

/* DIFFICULTY */
.diff-btns {
  display: flex;
  flex-direction: column;
  gap: 10px;
  width: 100%;
  max-width: 280px;
}
.diff-btn {
  border-radius: 12px;
  border: 1px solid;
  font-family: 'Outfit', sans-serif;
  font-size: 16px;
  font-weight: 800;
  padding: 14px 24px;
  cursor: pointer;
  transition: transform .1s, opacity .15s;
  letter-spacing: 0.3px;
}
.diff-btn:hover { transform: translateY(-2px); opacity: 0.9; }
.diff-btn.easy       { background: rgba(125,220,95,0.15);  border-color: rgba(125,220,95,0.4);  color: #7ddc5f; }
.diff-btn.medium     { background: rgba(245,200,66,0.15);  border-color: rgba(245,200,66,0.4);  color: #f5c842; }
.diff-btn.hard       { background: rgba(248,113,113,0.15); border-color: rgba(248,113,113,0.4); color: #f87171; }
.diff-btn.impossible { background: rgba(167,139,250,0.15); border-color: rgba(167,139,250,0.4); color: #a78bfa; }

/* GAME OVER */
.result-row {
  display: flex;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
  justify-content: center;
}
.result-side {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 24px 36px;
  border-radius: 16px;
  border: 1px solid rgba(255,255,255,0.08);
  background: rgba(255,255,255,0.04);
  min-width: 140px;
  transition: background .2s;
}
.result-side.winner-side {
  background: rgba(125,220,95,0.1);
  border-color: rgba(125,220,95,0.3);
}
.result-side.loser-side {
  background: rgba(248,113,113,0.07);
  border-color: rgba(248,113,113,0.2);
  opacity: 0.75;
}
.result-badge {
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
}
.winner-side .result-badge { color: #7ddc5f; }
.loser-side  .result-badge { color: #f87171; }
.result-name  { font-size: 15px; font-weight: 700; color: rgba(255,255,255,0.7); }
.result-score { font-family: 'JetBrains Mono', monospace; font-size: 52px; font-weight: 700; line-height: 1; }
.winner-side .result-score { color: #fff; }
.loser-side  .result-score { color: rgba(255,255,255,0.35); }
.result-divider { font-family: 'JetBrains Mono', monospace; font-size: 28px; color: rgba(255,255,255,0.2); }
.over-btns { display: flex; gap: 14px; flex-wrap: wrap; justify-content: center; }