:root {
  --bg: #0e1424;
  --panel: #161d33;
  --cell: #1e2740;
  --cell-hover: #27314f;
  --grid-line: #0a0f1c;
  --text: #e6ebf5;
  --muted: #8a95b2;
  --p1: #ff5d6c;
  --p1-glow: rgba(255, 93, 108, 0.55);
  --p2: #46a7ff;
  --p2-glow: rgba(70, 167, 255, 0.55);
  --radius: 14px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background: radial-gradient(1200px 800px at 50% -10%, #1a2440, var(--bg));
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  display: flex;
  justify-content: center;
  padding: 24px 16px 48px;
}

.app { width: 100%; max-width: 560px; }

.topbar { text-align: center; margin-bottom: 18px; }
.topbar h1 {
  margin: 0;
  font-size: 34px;
  letter-spacing: 6px;
  text-transform: uppercase;
  background: linear-gradient(90deg, var(--p1), var(--p2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.subtitle { margin: 4px 0 0; color: var(--muted); font-size: 13px; }

.settings {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}
.seg {
  display: inline-flex;
  background: var(--panel);
  border-radius: 10px;
  padding: 4px;
  gap: 4px;
}
.seg-btn {
  border: none;
  background: transparent;
  color: var(--muted);
  padding: 7px 16px;
  border-radius: 7px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background .15s, color .15s;
}
.seg-btn:hover { color: var(--text); }
.seg-btn.active {
  background: var(--cell-hover);
  color: var(--text);
  box-shadow: inset 0 0 0 1px rgba(255,255,255,.06);
}
.difficulty {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 14px;
}
.difficulty.hidden { display: none; }
.difficulty select {
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--cell-hover);
  border-radius: 8px;
  padding: 7px 10px;
  font-size: 14px;
  cursor: pointer;
}

.lobby {
  background: var(--panel);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 16px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.lobby.hidden { display: none; }
.lobby .field { display: flex; flex-direction: column; gap: 6px; font-size: 13px; color: var(--muted); }
.lobby input {
  background: var(--cell);
  color: var(--text);
  border: 1px solid var(--cell-hover);
  border-radius: 8px;
  padding: 9px 11px;
  font-size: 15px;
  outline: none;
}
.lobby input:focus { border-color: var(--muted); }
.lobby-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.lobby-or { color: var(--muted); font-size: 13px; }
.join-row { display: flex; gap: 8px; flex: 1; min-width: 180px; }
#join-code {
  flex: 1;
  text-transform: uppercase;
  letter-spacing: 3px;
  font-weight: 700;
  text-align: center;
}
.lobby-status { margin: 0; color: var(--muted); font-size: 14px; min-height: 1.2em; }
.lobby-status strong {
  color: var(--text);
  font-size: 20px;
  letter-spacing: 4px;
  background: var(--cell);
  padding: 2px 10px;
  border-radius: 6px;
}

.player.you .name::after {
  content: " (du)";
  color: var(--muted);
  font-weight: 400;
}

.statusbar {
  background: var(--panel);
  border-radius: var(--radius);
  padding: 12px 14px;
  margin-bottom: 16px;
}
.players { display: flex; gap: 10px; }
.player {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 10px;
  background: var(--cell);
  border: 2px solid transparent;
  transition: border-color .2s, box-shadow .2s, transform .2s;
}
.player .dot { width: 14px; height: 14px; border-radius: 50%; }
.player.p1 .dot { background: var(--p1); }
.player.p2 .dot { background: var(--p2); }
.player .name {
  flex: 1;
  font-size: 14px;
  outline: none;
  border-radius: 5px;
  padding: 1px 5px;
  cursor: text;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: background .15s, box-shadow .15s;
}
.player .name:hover { background: rgba(255, 255, 255, .07); }
.player .name:focus {
  background: rgba(255, 255, 255, .11);
  box-shadow: 0 0 0 1px var(--muted);
  overflow: visible;
  text-overflow: clip;
}
.player .score { font-variant-numeric: tabular-nums; font-weight: 700; }
.player.active { transform: translateY(-1px); }
.player.p1.active { border-color: var(--p1); box-shadow: 0 0 14px var(--p1-glow); }
.player.p2.active { border-color: var(--p2); box-shadow: 0 0 14px var(--p2-glow); }
.player.loser { opacity: .45; }

.turn { text-align: center; margin: 12px 0 2px; font-size: 14px; color: var(--muted); }

.board-wrap { position: relative; }
.board {
  display: grid;
  /* Spalten/Zeilen werden je nach Feldgröße per JS gesetzt. */
  gap: 4px;
  background: var(--grid-line);
  padding: 4px;
  border-radius: var(--radius);
  aspect-ratio: 1 / 1;
  box-shadow: 0 20px 60px rgba(0,0,0,.45);
}

.cell {
  position: relative;
  background: var(--cell);
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 0;
  min-height: 0;
  overflow: hidden;
  transition: background .15s, box-shadow .15s, transform .08s;
}
.cell:hover { background: var(--cell-hover); }
.cell.disabled { cursor: default; }
.cell.invalid { animation: shake .3s; }

/* Feste 2x2-Quadranten: Steine füllen der Reihe nach oben-links, oben-rechts,
   unten-links, unten-rechts. So belegt 1 den Quadranten links oben, 2 die obere
   Hälfte, 3 alles außer rechts unten, 4 alle vier Quadranten. */
.pips {
  display: grid;
  width: 92%;
  height: 92%;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr 1fr;
}
.pip {
  width: 72%;
  aspect-ratio: 1;
  border-radius: 50%;
  place-self: center;
}
.cell.p1 .pip { background: var(--p1); box-shadow: 0 0 8px var(--p1-glow); }
.cell.p2 .pip { background: var(--p2); box-shadow: 0 0 8px var(--p2-glow); }
.pips .num {
  font-weight: 800;
  font-size: 18px;
  font-variant-numeric: tabular-nums;
}
.cell.p1 .num { color: var(--p1); }
.cell.p2 .num { color: var(--p2); }

.overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(8, 12, 24, .72);
  border-radius: var(--radius);
  backdrop-filter: blur(3px);
}
.overlay.hidden { display: none; }
.overlay-card { text-align: center; }
.overlay-card p { font-size: 26px; font-weight: 800; margin: 0 0 16px; }

.btn {
  border: none;
  border-radius: 10px;
  padding: 11px 20px;
  font-size: 15px;
  font-weight: 600;
  color: #0e1424;
  background: linear-gradient(90deg, var(--p1), var(--p2));
  cursor: pointer;
}
.btn:hover { filter: brightness(1.08); }
.btn.ghost {
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--muted);
}

.help {
  margin-top: 18px;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}
.help details { color: var(--muted); font-size: 13px; flex: 1; }
.help summary { cursor: pointer; }
.help ul { margin: 10px 0 0; padding-left: 18px; line-height: 1.5; }

.repo {
  margin: 18px 0 0;
  text-align: center;
  color: var(--muted);
  font-size: 12px;
}
.repo a { color: var(--muted); text-decoration: underline; }
.repo a:hover { color: var(--text); }

@keyframes shake {
  0%,100% { transform: translateX(0); }
  25% { transform: translateX(-4px); }
  75% { transform: translateX(4px); }
}