:root {
  --frame-bg: #c0c0c0;
  --frame-dark: #808080;
  --frame-light: #ffffff;
  --tile: 30px;
  --cell: 26px;
  --num-1: #0000ff;
  --num-2: #008000;
  --num-3: #ff0000;
  --num-4: #000080;
  --num-5: #800000;
  --num-6: #008080;
  --num-7: #000000;
  --num-8: #808080;
}

* {
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: "Segoe UI", Tahoma, Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: #2f6e2f;
  color: #1a1a1a;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 20px;
  user-select: none;
}

.app {
  display: inline-flex;
  flex-direction: column;
  gap: 12px;
}

.toolbar {
  display: flex;
  align-items: flex-end;
  gap: 12px;
  background: #efefef;
  border: 2px solid #000;
  border-radius: 6px;
  padding: 10px 12px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 13px;
  font-weight: 700;
  color: #333;
}

.field select {
  font-size: 14px;
  padding: 6px 8px;
  border: 2px solid #999;
  border-radius: 4px;
  background: #fff;
  cursor: pointer;
}

.btn {
  font-size: 14px;
  font-weight: 700;
  padding: 8px 16px;
  border: 2px solid #000;
  border-radius: 4px;
  background: #e6e6e6;
  box-shadow: inset -2px -2px 0 #9a9a9a, inset 2px 2px 0 #fff;
  cursor: pointer;
}

.btn:active {
  box-shadow: inset 2px 2px 0 #9a9a9a, inset -2px -2px 0 #fff;
}

.frame {
  background: var(--frame-bg);
  border: 3px solid;
  border-color: var(--frame-light) var(--frame-dark) var(--frame-dark) var(--frame-light);
  padding: 10px;
  display: inline-flex;
  flex-direction: column;
  gap: 10px;
  max-width: 100%;
}

.panel {
  background: var(--frame-bg);
  border: 3px solid;
  border-color: var(--frame-dark) var(--frame-light) var(--frame-light) var(--frame-dark);
  padding: 5px 8px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.counter {
  font-family: "Courier New", monospace;
  font-weight: 700;
  font-size: 28px;
  letter-spacing: 2px;
  background: #000;
  color: #ff0000;
  padding: 2px 8px;
  border: 1px solid #000;
  min-width: 74px;
  text-align: center;
}

.face {
  font-size: 22px;
  line-height: 1;
  width: 40px;
  height: 40px;
  border: 3px solid;
  border-color: var(--frame-light) var(--frame-dark) var(--frame-dark) var(--frame-light);
  background: var(--frame-bg);
  cursor: pointer;
  padding: 0;
}

.face:active {
  border-color: var(--frame-dark) var(--frame-light) var(--frame-light) var(--frame-dark);
}

.board-scroll {
  overflow: auto;
  max-width: 100%;
  border: 3px solid;
  border-color: var(--frame-dark) var(--frame-light) var(--frame-light) var(--frame-dark);
}

.board {
  display: grid;
  gap: 0;
  width: max-content;
}

.cell {
  width: var(--cell);
  height: var(--cell);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: "Courier New", monospace;
  font-weight: 800;
  font-size: calc(var(--cell) * 0.62);
  line-height: 1;
  background: var(--frame-bg);
  border: 3px solid;
  border-color: var(--frame-light) var(--frame-dark) var(--frame-dark) var(--frame-light);
  cursor: pointer;
  overflow: hidden;
}

.cell.revealed,
.cell.flagged,
.cell.question {
  border: 1px solid #b0b0b0;
  cursor: default;
}

.cell.revealed {
  background: #cfcfcf;
}

.cell.pressed {
  border: 1px solid #b0b0b0;
}

.cell.bomb {
  background: #cfcfcf;
}

.cell.bomb-hit {
  background: #ff3232;
}

.cell.wrong-flag {
  background: #cfcfcf;
  position: relative;
}

.cell.wrong-flag::after {
  content: "\2716";
  position: absolute;
  color: #ff0000;
  font-size: calc(var(--cell) * 0.7);
}

.cell[data-n="1"] { color: var(--num-1); }
.cell[data-n="2"] { color: var(--num-2); }
.cell[data-n="3"] { color: var(--num-3); }
.cell[data-n="4"] { color: var(--num-4); }
.cell[data-n="5"] { color: var(--num-5); }
.cell[data-n="6"] { color: var(--num-6); }
.cell[data-n="7"] { color: var(--num-7); }
.cell[data-n="8"] { color: var(--num-8); }

.hint {
  margin: 0;
  max-width: 520px;
  color: #eaffea;
  font-size: 13px;
  line-height: 1.6;
}

@media (max-width: 760px) {
  :root {
    --cell: 26px;
  }
}