:root {
  --bg: #d7d7d7;
  --bg-revealed: #d2d2d2;
  --page-bg: #6e6e6e;
  --border-light: #f7f7f7;
  --border-dark: #8e8e8e;
  --text: #0d0d0d;
  --btn-size: 40px;
  --digit-bg: #000;
  --digit: #f00;
  --accent: #1b6f6a;
}

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: var(--page-bg);
  font-family: system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;
  color: var(--text);
  -webkit-tap-highlight-color: transparent;
}

.app {
  display: flex;
  flex-direction: column;
  height: 100vh;
  height: 100dvh;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 5;
  padding: 10px 10px 8px;
  background: var(--bg);
  border-bottom: 2px solid #666;
}

.toolbar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  user-select: none;
}

.spacer {
  width: 48px;
}

.digit {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 4px 8px;
  background: var(--digit-bg);
  border: 2px solid var(--border-dark);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-weight: 800;
  font-size: 24px;
  letter-spacing: 2px;
  color: var(--digit);
  min-width: 62px;
  box-sizing: border-box;
}

.icon {
  font-size: 18px;
  line-height: 1;
}

.btn3d {
  width: var(--btn-size);
  height: var(--btn-size);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
  border-top: 2px solid var(--border-light);
  border-left: 2px solid var(--border-light);
  border-bottom: 2px solid var(--border-dark);
  border-right: 2px solid var(--border-dark);
  box-sizing: border-box;
  user-select: none;
  cursor: pointer;
}

.smiley {
  width: 48px;
  height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
  border-top: 3px solid var(--border-light);
  border-left: 3px solid var(--border-light);
  border-bottom: 3px solid var(--border-dark);
  border-right: 3px solid var(--border-dark);
  box-sizing: border-box;
  user-select: none;
  cursor: pointer;
  font-size: 24px;
}

.subbar {
  margin-top: 10px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.select, .smallBtn {
  height: 38px;
  background: var(--bg);
  border-top: 2px solid var(--border-light);
  border-left: 2px solid var(--border-light);
  border-bottom: 2px solid var(--border-dark);
  border-right: 2px solid var(--border-dark);
  color: #fff;
  padding: 0 10px;
  font-weight: 700;
  cursor: pointer;
  box-sizing: border-box;
}

.smallBtn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.main {
  flex: 1;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.boardWrap {
  flex: 1;
  overflow: auto;
  padding: 12px;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  overscroll-behavior: contain;
}

.boardFrame {
  width: fit-content;
  max-width: min(92vw, 460px);
  padding: 8px;
  background: var(--bg);
  border-top: 3px solid var(--border-dark);
  border-left: 3px solid var(--border-dark);
  border-bottom: 3px solid var(--border-light);
  border-right: 3px solid var(--border-light);
  box-sizing: border-box;
}

.row {
  display: flex;
}

.cell {
  width: var(--cell);
  height: var(--cell);
  flex: 0 0 var(--cell);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-sizing: border-box;
  background: var(--bg);
  border-top: 2px solid var(--border-light);
  border-left: 2px solid var(--border-light);
  border-bottom: 2px solid var(--border-dark);
  border-right: 2px solid var(--border-dark);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-weight: 800;
  font-size: calc(var(--cell) * 0.62);
  line-height: 1;
  user-select: none;
  cursor: pointer;
  touch-action: manipulation;
}

.cell.startHint {
  outline: 3px solid #2ecc71;
  outline-offset: -3px;
}

.cell.revealed {
  background: var(--bg-revealed);
  border-top: 2px solid var(--border-dark);
  border-left: 2px solid var(--border-dark);
  border-bottom: 2px solid var(--border-light);
  border-right: 2px solid var(--border-light);
  cursor: default;
}

.cell.exploded {
  background: #f00;
}

.modalOverlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.55);
  display: none;
  align-items: flex-start;
  justify-content: center;
  padding: 16px;
  z-index: 20;
}

.modal {
  width: min(560px, 100%);
  margin-top: 16px;
  background: var(--bg);
  border-top: 3px solid var(--border-light);
  border-left: 3px solid var(--border-light);
  border-bottom: 3px solid var(--border-dark);
  border-right: 3px solid var(--border-dark);
  box-sizing: border-box;
  padding: 12px;
}

.modalHeader {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

.modalTitle {
  font-weight: 900;
  font-size: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  user-select: none;
}

.modalBody {
  max-height: min(70vh, 520px);
  overflow: auto;
  background: var(--bg);
  border: 2px solid var(--border-dark);
}

.listRow {
  display: flex;
  gap: 10px;
  align-items: center;
  padding: 8px 10px;
  border-bottom: 1px solid #e0e0e0;
  font-size: 13px;
}

.listRow strong {
  display: inline-block;
  min-width: 34px;
}

.badge {
  font-weight: 900;
  background: rgba(27,111,106,0.16);
  border: 1px solid rgba(27,111,106,0.40);
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 12px;
}

.numbers-1 { color: #00f; }
.numbers-2 { color: #008000; }
.numbers-3 { color: #f00; }
.numbers-4 { color: #000080; }
.numbers-5 { color: #800000; }
.numbers-6 { color: #008080; }
.numbers-7 { color: #000; }
.numbers-8 { color: #808080; }

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #2c2c2c;
    --bg-revealed: #252525;
    --page-bg: #1e1e1e;
    --border-light: #6a6a6a;
    --border-dark: #101010;
    --text: #f2f2f2;
  }
  .modalBody { background: var(--bg); }
  .listRow { border-bottom-color: #404040; }
}