:root {
  color-scheme: dark;
  font-family: Arial, Helvetica, sans-serif;
  --bg: #120d1f;
  --panel: #201832;
  --panel-soft: #2b2340;
  --text: #fff8df;
  --muted: #c9bbdf;
  --border: #5a477e;
  --accent: #f4d35e;
  --accent-strong: #ffd978;
  --accent-text: #24172f;
  --warning: #ffcf70;
  --card: #2b2340;
  --card-open: #fff8df;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at top left, rgba(244, 211, 94, 0.16), transparent 30rem),
    radial-gradient(circle at bottom right, rgba(123, 44, 191, 0.2), transparent 28rem),
    var(--bg);
  color: var(--text);
}

button,
input {
  font: inherit;
}

button {
  border: 1px solid rgba(244, 211, 94, 0.45);
  border-radius: 6px;
  background: var(--accent);
  color: var(--accent-text);
  cursor: pointer;
  min-height: 42px;
  padding: 0 16px;
  font-weight: 700;
}

button:hover {
  background: var(--accent-strong);
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.65;
}

.app {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 28px 0;
}

.topbar {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  align-items: flex-start;
  margin-bottom: 24px;
}

.eyebrow {
  margin: 0 0 6px;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 8px;
  font-size: clamp(2rem, 3vw, 3rem);
  color: #ffffff;
}

h2 {
  margin-bottom: 14px;
  font-size: 1.2rem;
}

.description {
  max-width: 660px;
  margin-bottom: 0;
  color: var(--muted);
  line-height: 1.5;
}

.meta {
  display: grid;
  gap: 8px;
  min-width: 230px;
  color: var(--muted);
  font-size: 0.92rem;
  text-align: right;
}

.game-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 20px;
  align-items: start;
}

.play-area,
.leaderboard,
.save-panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.22);
}

.play-area {
  padding: 16px;
}

.status-panel {
  display: grid;
  grid-template-columns: repeat(3, 1fr) auto;
  gap: 12px;
  align-items: center;
  margin-bottom: 16px;
}

.status-panel > div {
  min-height: 58px;
  border: 1px solid rgba(244, 211, 94, 0.28);
  border-radius: 6px;
  padding: 10px 12px;
  background: var(--panel-soft);
}

.label {
  display: block;
  margin-bottom: 4px;
  color: var(--muted);
  font-size: 0.78rem;
  text-transform: uppercase;
}

.status-panel strong {
  font-size: 1.35rem;
  color: #ffffff;
}

.board {
  display: grid;
  grid-template-columns: repeat(4, minmax(110px, 1fr));
  gap: 10px;
}

.card {
  position: relative;
  min-height: 126px;
  border: 2px solid #f4d35e;
  border-radius: 8px;
  padding: 12px;
  background: var(--card);
  color: #fff;
  cursor: pointer;
  text-align: center;
  transition:
    transform 150ms ease,
    background 150ms ease,
    border-color 150ms ease;
}

.card:hover {
  border-color: var(--accent-strong);
  box-shadow: 0 0 18px rgba(244, 211, 94, 0.2);
  transform: translateY(-1px);
}

.card.open,
.card.matched {
  background: var(--card-open);
  border-color: #7b2cbf;
  color: var(--text);
  cursor: default;
}

.card.matched {
  border-color: var(--accent);
  box-shadow:
    inset 0 0 0 2px rgba(244, 211, 94, 0.25),
    0 0 18px rgba(244, 211, 94, 0.16);
}

.card-back-image {
  display: block;
  width: min(86px, 68%);
  height: auto;
  margin: 0 auto;
}

.card-image {
  display: none;
  width: min(82px, 65%);
  height: auto;
  margin: 0 auto;
}

.card.open .card-image,
.card.matched .card-image {
  display: block;
}

.card.open .card-back-image,
.card.matched .card-back-image {
  display: none;
}

.card:not(.open):not(.matched)::after {
  content: "";
  position: absolute;
  inset: 8px;
  border: 1px solid rgba(244, 211, 94, 0.45);
  border-radius: 6px;
  pointer-events: none;
}

.leaderboard {
  padding: 16px;
}

.leaderboard-header {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
}

.leaderboard-header h2 {
  margin: 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.94rem;
}

th,
td {
  border-bottom: 1px solid rgba(244, 211, 94, 0.18);
  padding: 10px 6px;
  text-align: left;
}

th {
  color: var(--accent);
  font-size: 0.78rem;
  text-transform: uppercase;
}

.save-panel {
  margin-top: 16px;
  padding: 16px;
}

.save-panel label {
  display: block;
  margin-bottom: 8px;
  font-weight: 700;
}

.save-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
}

input {
  min-height: 42px;
  width: 100%;
  border: 1px solid rgba(244, 211, 94, 0.35);
  border-radius: 6px;
  padding: 0 12px;
  background: #171126;
  color: var(--text);
}

.sync-status {
  min-height: 22px;
  margin: 10px 0 0;
  color: var(--warning);
}

.hidden {
  display: none;
}

@media (max-width: 900px) {
  .topbar,
  .game-layout {
    grid-template-columns: 1fr;
  }

  .topbar {
    display: grid;
  }

  .meta {
    min-width: 0;
    text-align: left;
  }

  .board {
    grid-template-columns: repeat(3, minmax(90px, 1fr));
  }
}

@media (max-width: 620px) {
  .app {
    width: min(100% - 20px, 1180px);
    padding-top: 16px;
  }

  .status-panel,
  .save-row {
    grid-template-columns: 1fr;
  }

  .board {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .card {
    min-height: 104px;
  }
}