:root {
  --bg: #0b1220;
  --panel: rgba(255, 255, 255, 0.06);
  --panel2: rgba(255, 255, 255, 0.08);
  --text: rgba(255, 255, 255, 0.92);
  --muted: rgba(255, 255, 255, 0.72);
  --border: rgba(255, 255, 255, 0.14);
  --shadow: 0 16px 40px rgba(0, 0, 0, 0.45);

  --cardBack1: #1a2a55;
  --cardBack2: #111c3f;
  --cardFace: rgba(255, 255, 255, 0.08);

  --good: #2af598;
  --bad: #ff4d6d;
}

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  color: var(--text);
  background: radial-gradient(1200px 800px at 20% 10%, rgba(80, 120, 255, 0.18), transparent 60%),
              radial-gradient(900px 650px at 90% 10%, rgba(0, 255, 170, 0.14), transparent 55%),
              radial-gradient(900px 650px at 40% 100%, rgba(255, 180, 0, 0.10), transparent 60%),
              var(--bg);
}

.app {
  max-width: 1100px;
  margin: 0 auto;
  padding: 18px;
}

.topbar {
  display: flex;
  gap: 12px;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.topbarLeft{
  min-width: 220px;
}

.topbarCenter{
  flex: 1;
  display:flex;
  align-items:center;
  justify-content:center;
  padding: 0 10px;
}

.brand{
  font-family: ui-rounded, "Segoe Print", "Segoe Script", "Bradley Hand", "Comic Sans MS", ui-sans-serif;
  font-size: 14px;
  font-weight: 900;
  letter-spacing: 0.8px;
  background: linear-gradient(90deg, rgba(255, 209, 102, 0.95), rgba(124, 92, 255, 0.95));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  text-shadow: 0 10px 26px rgba(0,0,0,0.35);
}

.topbar h1 {
  margin: 0;
  font-size: 18px;
}

.status {
  margin-top: 6px;
  color: var(--muted);
  font-size: 14px;
}

.info {
  margin-top: 4px;
  color: var(--muted);
  font-size: 14px;
}

.controls {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
}

.select {
  display: inline-flex;
  gap: 8px;
  align-items: center;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--panel2);
  color: var(--text);
  font-weight: 800;
}

.select span {
  color: var(--muted);
}

.select select {
  background: transparent;
  border: none;
  color: var(--text);
  font-weight: 900;
  outline: none;
}

.select select option {
  background: #0b1220;
  color: var(--text);
}

.btn {
  appearance: none;
  border: 1px solid var(--border);
  background: var(--panel2);
  color: var(--text);
  padding: 10px 12px;
  border-radius: 12px;
  cursor: pointer;
  font-weight: 900;
}

.main {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 16px;
  margin-top: 16px;
}

@media (max-width: 940px) {
  .main { grid-template-columns: 1fr; }
  .topbarCenter{display:none}
}

.boardPanel {
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--panel);
  box-shadow: var(--shadow);
  padding: 16px;
}

.board {
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(4, minmax(70px, 1fr));
  width: min(76vh, 720px);
  max-width: 100%;
  margin: 0 auto;
  position: relative;
}

.cardBtn {
  position: relative;
  width: 100%;
  aspect-ratio: 1 / 1;
  border: none;
  padding: 0;
  border-radius: 16px;
  cursor: pointer;
  background: transparent;
}

.cardInner {
  position: absolute;
  inset: 0;
  border-radius: 16px;
  transform-style: preserve-3d;
  transition: transform 180ms ease;
}

.cardBtn.flipped .cardInner,
.cardBtn.matched .cardInner {
  transform: rotateY(180deg);
}

.cardFace,
.cardBack {
  position: absolute;
  inset: 0;
  border-radius: 16px;
  display: grid;
  place-items: center;
  backface-visibility: hidden;
  border: 1px solid rgba(255, 255, 255, 0.14);
  box-shadow: 0 14px 30px rgba(0, 0, 0, 0.30);
}

.cardBack {
  background: linear-gradient(180deg, var(--cardBack1), var(--cardBack2));
}

.cardBack::after {
  content: "?";
  font-weight: 1000;
  font-size: 22px;
  color: rgba(255, 255, 255, 0.82);
  text-shadow: 0 8px 18px rgba(0, 0, 0, 0.35);
}

.cardFace {
  transform: rotateY(180deg);
  background: var(--cardFace);
  font-size: 34px;
}

.cardBtn:focus {
  outline: 2px solid rgba(255, 255, 255, 0.32);
  outline-offset: 2px;
}

.cardBtn.matched {
  cursor: default;
}

.boardOverlay {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  background: rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(2px);
  border-radius: 16px;
}

.boardOverlayCard {
  width: min(520px, 92%);
  border: 1px solid var(--border);
  border-radius: 14px;
  background: rgba(15, 20, 35, 0.75);
  box-shadow: var(--shadow);
  padding: 16px 18px;
  text-align: center;
}

.boardOverlayTitle {
  font-size: 18px;
  font-weight: 900;
}

.boardOverlaySubtitle {
  margin-top: 8px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 800;
}

.side {
  display: grid;
  gap: 16px;
}

.card {
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--panel);
  box-shadow: var(--shadow);
  padding: 14px 16px;
}

.card h2 {
  margin: 0 0 10px 0;
  font-size: 15px;
}

.card p {
  margin: 8px 0;
  color: var(--muted);
  line-height: 1.35;
}