:root {
  --bg: #0f1117;
  --panel: #171a23;
  --panel2: #1e2230;
  --line: #2a2f3f;
  --text: #e7e9ee;
  --muted: #99a0b0;
  --accent: #6c8cff;
  --accent2: #a06bff;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
}

a { color: inherit; text-decoration: none; }

.wrap { max-width: 1040px; margin: 0 auto; padding: 0 20px; }

header {
  border-bottom: 1px solid var(--line);
  background: rgba(15, 17, 23, .9);
  position: sticky; top: 0; z-index: 10;
  backdrop-filter: blur(6px);
}

.nav { display: flex; align-items: center; gap: 22px; height: 64px; }

.logo { display: flex; align-items: center; gap: 10px; font-weight: 700; letter-spacing: .3px; }

.logo .mark {
  width: 30px; height: 30px; border-radius: 8px;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  display: grid; place-items: center; font-size: 15px;
}

.nav .links { display: flex; gap: 18px; margin-left: auto; color: var(--muted); }
.nav .links a:hover { color: var(--text); }

.hero { padding: 54px 0 34px; }

.hero h1 { font-size: 38px; line-height: 1.15; margin: 0 0 12px; letter-spacing: -.5px; }

.hero p { color: var(--muted); max-width: 620px; margin: 0; }

.hero .badge {
  display: inline-block; margin-bottom: 16px; padding: 5px 12px;
  border: 1px solid var(--line); border-radius: 999px;
  color: var(--muted); font-size: 13px; background: var(--panel);
}

.grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px; padding: 10px 0 56px;
}

.card {
  display: block; border: 1px solid var(--line); border-radius: 14px;
  background: var(--panel); overflow: hidden;
  transition: transform .15s ease, border-color .15s ease;
}

.card:hover { transform: translateY(-3px); border-color: #3b4560; }

.card .thumb {
  height: 132px; display: grid; place-items: center; font-size: 46px;
  background: radial-gradient(120% 120% at 20% 0%, #242a3d 0%, #14171f 70%);
  border-bottom: 1px solid var(--line);
}

.card .body { padding: 14px 16px 16px; }
.card h3 { margin: 0 0 4px; font-size: 17px; }
.card p { margin: 0; color: var(--muted); font-size: 14px; }

.tag {
  display: inline-block; margin-top: 10px; font-size: 12px; color: var(--muted);
  border: 1px solid var(--line); border-radius: 999px; padding: 2px 9px;
}

.game-shell { padding: 30px 0 60px; }

.game-head { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
.game-head h1 { font-size: 26px; margin: 0; }
.game-head .back { color: var(--muted); }
.game-head .back:hover { color: var(--text); }

.panel {
  margin-top: 20px; border: 1px solid var(--line); border-radius: 16px;
  background: var(--panel); padding: 18px;
}

.hud { display: flex; gap: 18px; align-items: center; margin-bottom: 14px; flex-wrap: wrap; }
.hud .score { font-variant-numeric: tabular-nums; color: var(--muted); }
.hud .score b { color: var(--text); font-size: 19px; margin-left: 6px; }

button.btn {
  font: inherit; cursor: pointer; color: var(--text);
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  border: 0; border-radius: 10px; padding: 9px 16px; font-weight: 600;
}

button.btn.ghost {
  background: var(--panel2); border: 1px solid var(--line); font-weight: 500;
}

canvas { background: #0b0d13; border: 1px solid var(--line); border-radius: 12px; display: block; max-width: 100%; }

.board { display: grid; grid-template-columns: repeat(4, 78px); gap: 10px; justify-content: center; }

.tile {
  aspect-ratio: 1; border-radius: 12px; border: 1px solid var(--line);
  background: var(--panel2); display: grid; place-items: center;
  font-size: 30px; cursor: pointer; user-select: none;
  transition: transform .12s ease, background .12s ease;
}

.tile.flipped { background: #232a3d; }
.tile.matched { background: #1d2f25; border-color: #2f5a42; cursor: default; }
.tile:hover:not(.matched) { transform: scale(1.03); }

footer { border-top: 1px solid var(--line); padding: 26px 0 40px; color: var(--muted); font-size: 14px; }
footer .row { display: flex; gap: 18px; flex-wrap: wrap; align-items: center; }
footer .copy { margin-left: auto; }

.hint { color: var(--muted); font-size: 14px; margin-top: 12px; }

@media (max-width: 560px) {
  .hero h1 { font-size: 29px; }
  .board { grid-template-columns: repeat(4, 64px); }
}