:root {
  --bg-top: #07111f;
  --bg-bottom: #10283e;
  --panel: rgba(248, 243, 229, 0.92);
  --panel-strong: rgba(255, 250, 238, 0.98);
  --ink: #182232;
  --accent: #c95a2a;
  --accent-dark: #8a3918;
  --line: rgba(20, 31, 44, 0.16);
  --tile: #d4e0ed;
  --tile-shadow: #8ca2b5;
  --tile-open: #f6f2e7;
  --tile-open-shadow: rgba(24, 34, 50, 0.08);
  --tile-mine: #d3523f;
  --tile-fail: #f0d8bf;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Lucida Sans", "Trebuchet MS", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(255, 202, 136, 0.35), transparent 28%),
    radial-gradient(circle at 80% 20%, rgba(96, 204, 195, 0.24), transparent 25%),
    linear-gradient(180deg, var(--bg-top), var(--bg-bottom));
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 36px 36px;
  pointer-events: none;
  opacity: 0.35;
}

.page-shell {
  width: min(1200px, calc(100vw - 32px));
  margin: 24px auto;
  padding: 28px;
  position: relative;
}

.hero {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 24px;
  margin-bottom: 24px;
}

.hero-copy,
.hero-panel,
.control-card,
.board-panel {
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 24px;
  backdrop-filter: blur(10px);
  box-shadow: 0 18px 60px rgba(2, 8, 16, 0.28);
}

.hero-copy,
.control-card,
.board-panel {
  background: var(--panel);
}

.hero-copy {
  padding: 28px;
}

.hero-panel {
  background: linear-gradient(160deg, rgba(255, 240, 216, 0.95), rgba(255, 253, 247, 0.72));
  padding: 28px;
  display: grid;
  gap: 16px;
  align-content: center;
}

.eyebrow,
.card-label,
.metric-label {
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.78rem;
}

h1 {
  margin: 0 0 12px;
  font-family: "Palatino Linotype", "Book Antiqua", Georgia, serif;
  font-size: clamp(2.7rem, 6vw, 4.6rem);
  line-height: 0.95;
}

.intro {
  max-width: 46ch;
  margin: 0;
  font-size: 1.05rem;
  line-height: 1.6;
}

.metric strong {
  display: block;
  margin-top: 4px;
  font-size: clamp(1.35rem, 3vw, 2rem);
}

.layout {
  display: grid;
  grid-template-columns: minmax(240px, 300px) 1fr;
  gap: 24px;
  align-items: start;
}

.control-panel {
  display: grid;
  gap: 18px;
}

.control-card {
  padding: 22px;
}

.difficulty-picker {
  display: grid;
  gap: 10px;
}

.difficulty-picker button,
.restart {
  width: 100%;
  border: 0;
  border-radius: 14px;
  padding: 14px 16px;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

.difficulty-picker button {
  background: #e9dfcb;
  color: var(--ink);
  box-shadow: inset 0 -2px 0 rgba(0, 0, 0, 0.14);
}

.difficulty-picker button.active,
.restart {
  background: linear-gradient(180deg, #ea7d43, var(--accent));
  color: #fff7f0;
  box-shadow: 0 10px 18px rgba(142, 57, 24, 0.25);
}

.difficulty-picker button:hover,
.restart:hover {
  transform: translateY(-1px);
}

.board-panel {
  padding: 20px;
  overflow-x: auto;
}

.board {
  --cols: 16;
  width: max-content;
  display: grid;
  grid-template-columns: repeat(var(--cols), minmax(30px, 38px));
  gap: 6px;
}

.tile {
  width: clamp(30px, 2.4vw, 38px);
  aspect-ratio: 1;
  border: 0;
  border-radius: 10px;
  font: inherit;
  font-weight: 800;
  font-size: 1rem;
  cursor: pointer;
  color: var(--ink);
  background: linear-gradient(180deg, #edf5fb, var(--tile));
  box-shadow:
    inset 0 -3px 0 var(--tile-shadow),
    0 6px 10px rgba(16, 40, 62, 0.18);
  transition: transform 120ms ease, box-shadow 120ms ease, background 120ms ease;
}

.tile:hover {
  transform: translateY(-1px);
}

.tile.revealed,
.tile.mine,
.tile.exploded,
.tile.wrong-flag {
  cursor: default;
  transform: none;
  background: var(--tile-open);
  box-shadow: inset 0 0 0 1px var(--tile-open-shadow);
}

.tile.flagged {
  color: #fff5ef;
  background: linear-gradient(180deg, #ef8b5a, var(--accent));
  box-shadow:
    inset 0 -3px 0 var(--accent-dark),
    0 6px 10px rgba(142, 57, 24, 0.22);
}

.tile.mine,
.tile.exploded {
  color: #fff4ef;
  background: linear-gradient(180deg, #de6f55, var(--tile-mine));
}

.tile.wrong-flag {
  background: var(--tile-fail);
  color: var(--accent-dark);
}

.tile.n1 {
  color: #1d4ed8;
}

.tile.n2 {
  color: #166534;
}

.tile.n3 {
  color: #b91c1c;
}

.tile.n4 {
  color: #4338ca;
}

.tile.n5 {
  color: #9a3412;
}

.tile.n6 {
  color: #0f766e;
}

.tile.n7 {
  color: #111827;
}

.tile.n8 {
  color: #4b5563;
}

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

  .page-shell {
    width: min(100vw - 20px, 900px);
    padding: 16px 0 28px;
  }

  .hero-copy,
  .hero-panel,
  .control-card,
  .board-panel {
    border-radius: 20px;
  }
}