:root {
  color-scheme: dark;
  font-family: "Avenir Next", "Segoe UI", sans-serif;
  --bg-0: #09111b;
  --bg-1: #102036;
  --bg-2: #241342;
  --panel: rgba(10, 20, 36, 0.82);
  --border: rgba(160, 223, 255, 0.14);
  --text: #eef7ff;
  --muted: #9eb7d2;
  --accent: #85ffd2;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(91, 233, 255, 0.16), transparent 28%),
    radial-gradient(circle at right, rgba(255, 142, 210, 0.15), transparent 24%),
    linear-gradient(140deg, var(--bg-0), var(--bg-1) 46%, var(--bg-2));
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 28px 28px;
  mask-image: radial-gradient(circle at center, black 42%, transparent 100%);
}

.arcade-app {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 28px 18px 36px;
}

.arcade-shell {
  width: min(1120px, 100%);
  display: grid;
  gap: 22px;
}

.arcade-hero {
  display: grid;
  gap: 10px;
}

.eyebrow {
  margin: 0;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.78rem;
}

.arcade-hero h1 {
  margin: 0;
  font-family: "Avenir Next Condensed", "Arial Narrow", sans-serif;
  font-size: clamp(2.8rem, 5vw, 5rem);
  line-height: 0.92;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.lead {
  margin: 0;
  max-width: 64ch;
  color: var(--muted);
  line-height: 1.6;
}

.arcade-layout {
  display: grid;
  grid-template-columns: minmax(320px, 1.1fr) minmax(300px, 0.86fr);
  gap: 22px;
}

.panel {
  border: 1px solid var(--border);
  background: var(--panel);
  border-radius: 28px;
  box-shadow:
    0 24px 60px rgba(0, 0, 0, 0.28),
    inset 0 1px 0 rgba(255, 255, 255, 0.06);
  backdrop-filter: blur(16px);
}

.stage-panel,
.side-panel {
  padding: 22px;
}

.side-panel {
  display: grid;
  align-content: start;
  gap: 16px;
}

.panel-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 18px;
}

.panel-head h2,
.panel-head p,
.card-label,
.status,
.meta,
.help,
.strategy {
  margin: 0;
}

.panel-head p,
.card-label,
.meta,
.help {
  color: var(--muted);
}

.status {
  margin-top: 18px;
  padding: 14px 16px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.05);
  color: #d9ecff;
  line-height: 1.45;
}

.board-shell,
.card {
  margin-top: 18px;
  padding: 16px;
  border-radius: 24px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.04), transparent 18%),
    linear-gradient(180deg, rgba(14, 31, 52, 0.96), rgba(6, 12, 24, 0.98));
  box-shadow: inset 0 0 0 1px rgba(124, 248, 207, 0.08);
}

.card {
  margin-top: 0;
  background: rgba(255, 255, 255, 0.04);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.05);
}

.stat-grid,
.actions,
.controls {
  display: grid;
  gap: 12px;
}

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

.stat {
  padding: 14px 16px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.04);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.05);
}

.stat span {
  display: block;
  color: var(--muted);
  font-size: 0.85rem;
}

.stat strong {
  display: block;
  margin-top: 6px;
  font-size: 1.48rem;
  font-weight: 700;
}

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

.actions .wide,
.controls .wide {
  grid-column: span 2;
}

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

button,
a.button-link {
  border: 0;
  border-radius: 16px;
  padding: 13px 14px;
  color: var(--text);
  text-decoration: none;
  text-align: center;
  background:
    linear-gradient(180deg, rgba(126, 235, 216, 0.18), rgba(38, 90, 109, 0.22)),
    rgba(255, 255, 255, 0.05);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.12),
    0 10px 24px rgba(0, 0, 0, 0.2);
  font: inherit;
  cursor: pointer;
  transition: transform 120ms ease, filter 120ms ease;
}

input[type="number"] {
  width: 100%;
  border: 0;
  border-radius: 16px;
  padding: 13px 14px;
  color: var(--text);
  background: rgba(255, 255, 255, 0.06);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.08);
  font: inherit;
}

.field {
  display: grid;
  gap: 8px;
}

.field label {
  color: var(--muted);
  font-size: 0.88rem;
}

button:hover,
a.button-link:hover {
  filter: brightness(1.08);
}

button:active,
a.button-link:active {
  transform: translateY(1px);
}

.canvas-board {
  width: 100%;
  display: block;
  border-radius: 22px;
  background: rgba(8, 18, 33, 0.92);
}

.grid-board {
  display: grid;
  gap: 10px;
}

.grid-board.board-4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.grid-board.board-10 {
  grid-template-columns: repeat(10, minmax(0, 1fr));
}

.tile {
  aspect-ratio: 1;
  border-radius: 18px;
  display: grid;
  place-items: center;
  font-weight: 700;
  font-size: clamp(1rem, 2vw, 1.5rem);
}

.mine-cell {
  aspect-ratio: 1;
  border-radius: 12px;
  display: grid;
  place-items: center;
  font-weight: 700;
  user-select: none;
}

.help {
  line-height: 1.6;
}

.strategy {
  color: #dcecff;
  line-height: 1.5;
}

a {
  color: var(--accent);
}

@media (max-width: 920px) {
  .arcade-layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 560px) {
  .arcade-app {
    padding-inline: 12px;
  }

  .stage-panel,
  .side-panel {
    padding: 16px;
  }

  .panel-head {
    flex-direction: column;
    align-items: start;
  }
}