* {
  box-sizing: border-box;
}

:root {
  --bg: #07090f;
  --panel: #0c1019;
  --line: #202938;
  --text: #edf3fb;
  --muted: #7f8a9d;
  --blue: #7cc4ff;
  --blue-soft: rgba(124, 196, 255, 0.12);
  --danger: #ff6b7a;

  --cell: min(44px, 8.8vw);
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;

  background:
    radial-gradient(
      circle at 50% 0%,
      rgba(80, 130, 190, 0.07),
      transparent 38rem
    ),
    var(--bg);

  color: var(--text);

  font-family: "Inter", sans-serif;

  -webkit-font-smoothing: antialiased;
}

button,
a {
  font: inherit;
}

/* Navigation */

.nav {
  height: 76px;

  display: flex;
  align-items: center;
  justify-content: space-between;

  max-width: 1080px;
  margin: 0 auto;

  padding: 0 28px;
}

.wordmark {
  color: var(--text);

  text-decoration: none;

  font-size: 17px;
  font-weight: 600;

  letter-spacing: -0.03em;
}

.wordmark span {
  color: var(--muted);
  font-weight: 400;
}

.back {
  color: var(--muted);

  text-decoration: none;

  font: 12px "JetBrains Mono", monospace;

  transition: color 160ms ease;
}

.back:hover {
  color: var(--blue);
}

/* Main */

main {
  min-height: calc(100vh - 136px);

  display: flex;
  justify-content: center;

  padding: 70px 20px 100px;
}

.game-wrap {
  width: min(100%, 700px);
}

/* Intro */

.intro {
  margin-bottom: 38px;
}

.eyebrow {
  display: block;

  margin-bottom: 12px;

  color: var(--blue);

  font: 500 11px/1 "JetBrains Mono", monospace;

  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1 {
  margin: 0;

  font-size: clamp(38px, 8vw, 62px);
  line-height: 0.98;

  letter-spacing: -0.055em;
}

.intro p {
  margin: 17px 0 0;

  color: var(--muted);

  font-size: 15px;
}

/* Controls */

.controls {
  display: grid;

  grid-template-columns: 1fr auto 1fr;

  align-items: center;

  gap: 20px;

  padding: 14px;

  border: 1px solid var(--line);
  border-radius: 12px 12px 0 0;

  background: rgba(12, 16, 25, 0.9);
}

.stat {
  display: flex;
  align-items: baseline;

  gap: 9px;

  font-family: "JetBrains Mono", monospace;
}

.timer-stat {
  justify-content: flex-end;
}

.label {
  color: var(--muted);

  font-size: 10px;

  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.value {
  min-width: 32px;

  color: var(--blue);

  font-size: 14px;
}

/* Difficulty */

.difficulty {
  display: flex;

  gap: 3px;

  padding: 3px;

  border: 1px solid var(--line);
  border-radius: 8px;

  background: var(--bg);
}

.difficulty-btn {
  border: 0;
  border-radius: 5px;

  padding: 6px 9px;

  background: transparent;

  color: var(--muted);

  cursor: pointer;

  font: 500 10px "JetBrains Mono", monospace;

  transition:
    background 140ms ease,
    color 140ms ease;
}

.difficulty-btn:hover {
  color: var(--text);
}

.difficulty-btn.active {
  background: var(--blue-soft);
  color: var(--blue);
}

/* Status */

.status-row {
  min-height: 50px;

  display: flex;
  align-items: center;
  justify-content: space-between;

  gap: 16px;

  padding: 0 14px;

  border-left: 1px solid var(--line);
  border-right: 1px solid var(--line);

  background: rgba(12, 16, 25, 0.7);
}

#status {
  color: var(--muted);

  font-size: 12px;
}

#status.win {
  color: var(--blue);
}

#status.lose {
  color: var(--danger);
}

.new-game {
  border: 1px solid var(--line);
  border-radius: 6px;

  padding: 7px 10px;

  background: transparent;

  color: var(--text);

  cursor: pointer;

  font: 500 10px "JetBrains Mono", monospace;

  transition:
    border-color 140ms ease,
    color 140ms ease,
    background 140ms ease;
}

.new-game:hover {
  border-color: var(--blue);

  color: var(--blue);

  background: var(--blue-soft);
}

/* Board */

.board {
  --cols: 9;

  display: grid;

  grid-template-columns:
    repeat(var(--cols), var(--cell));

  width: fit-content;
  max-width: 100%;

  margin: 0 auto;

  padding: 8px;

  border: 1px solid var(--line);
  border-radius: 0 0 12px 12px;

  background: #080b12;

  user-select: none;
  -webkit-user-select: none;
}

/* Cells */

.cell {
  width: var(--cell);
  height: var(--cell);

  display: grid;
  place-items: center;

  border: 1px solid #171e2a;

  background: #0e141e;

  color: var(--text);

  cursor: pointer;

  font:
    500 clamp(11px, 2.7vw, 14px)
    "JetBrains Mono",
    monospace;

  transition:
    background 80ms ease,
    border-color 80ms ease;
}

.cell:hover:not(.revealed):not(.flagged) {
  background: #151d2a;
  border-color: #273447;
}

.cell.revealed {
  background: #090d14;

  border-color: #121923;

  cursor: default;
}

.cell.flagged {
  color: var(--blue);
}

.cell.mine {
  color: var(--danger);
}

.cell.exploded {
  background: rgba(255, 107, 122, 0.14);

  border-color: rgba(255, 107, 122, 0.3);
}

/* Numbers */

.cell[data-number="1"] {
  color: #7cc4ff;
}

.cell[data-number="2"] {
  color: #79d69b;
}

.cell[data-number="3"] {
  color: #ff9d7a;
}

.cell[data-number="4"] {
  color: #bd9cff;
}

.cell[data-number="5"] {
  color: #ff7a9e;
}

.cell[data-number="6"] {
  color: #65d8d1;
}

.cell[data-number="7"] {
  color: #e6eaf0;
}

.cell[data-number="8"] {
  color: #7f8a9d;
}

/* Hint */

.hint {
  margin: 16px 0 0;

  color: #596476;

  text-align: center;

  font: 10px "JetBrains Mono", monospace;
}

/* Footer */

footer {
  max-width: 1080px;

  margin: 0 auto;

  padding: 0 28px 28px;

  color: #596476;

  font: 11px "JetBrains Mono", monospace;
}

/* Mobile */

@media (max-width: 520px) {

  .nav {
    height: 64px;
    padding: 0 18px;
  }

  main {
    padding: 48px 12px 70px;
  }

  .intro {
    margin-bottom: 28px;
  }

  .controls {
    grid-template-columns: 1fr auto 1fr;

    gap: 8px;

    padding: 10px;
  }

  .difficulty-btn {
    padding: 6px 7px;

    font-size: 9px;
  }

  .status-row {
    padding: 0 10px;
  }

  .hint {
    display: none;
  }

  footer {
    padding: 0 18px 20px;
  }
}

@media (max-width: 370px) {

  :root {
    --cell: min(34px, 9vw);
  }

  .difficulty-btn {
    padding: 5px;
  }

  .label {
    display: none;
  }
}