:root {
  --bg: #3a3a3a;
  --panel-bg: #505050;
  --panel-hi: #6e6e6e;
  --panel-lo: #2a2a2a;
  --panel-inner-hi: #5e5e5e;
  --panel-inner-lo: #383838;
  --text: #e0e0e0;
  --text-dim: #999;
  --accent: #7ab;
  --danger: #e55;
  --cell-bg: #606060;
  --cell-hi: #888;
  --cell-lo: #3a3a3a;
  --cell-revealed-bg: #4a4a4a;
  --cell-revealed-border: #404040;
  --cell-flag-color: #7ab;
  --cell-mine-bg: #6a3030;
  --select-bg: #484848;
  --select-border-hi: #6e6e6e;
  --select-border-lo: #2a2a2a;
  --input-bg: #3e3e3e;
  --btn-bg: #585858;
  --btn-hi: #707070;
  --btn-lo: #333;
  --cell-size: 2rem;
  --n1: #6cacec;
  --n2: #5cb85c;
  --n3: #e06060;
  --n4: #8888cc;
  --n5: #c07050;
  --n6: #50a0a0;
  --n7: #c8c8c8;
  --n8: #909090;
}

[data-theme="light"] {
  --bg: #bfbfbf;
  --panel-bg: #c0c0c0;
  --panel-hi: #ffffff;
  --panel-lo: #808080;
  --panel-inner-hi: #dfdfdf;
  --panel-inner-lo: #808080;
  --text: #000000;
  --text-dim: #444;
  --accent: #000080;
  --danger: #ff0000;
  --cell-bg: #c0c0c0;
  --cell-hi: #ffffff;
  --cell-lo: #808080;
  --cell-revealed-bg: #bdbdbd;
  --cell-revealed-border: #7b7b7b;
  --cell-flag-color: #000080;
  --cell-mine-bg: #ff0000;
  --select-bg: #ffffff;
  --select-border-hi: #ffffff;
  --select-border-lo: #808080;
  --input-bg: #ffffff;
  --btn-bg: #c0c0c0;
  --btn-hi: #ffffff;
  --btn-lo: #808080;
  --n1: #0000ff;
  --n2: #008000;
  --n3: #ff0000;
  --n4: #000080;
  --n5: #800000;
  --n6: #008080;
  --n7: #000000;
  --n8: #808080;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  height: 100%;
}

body {
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", "Tahoma", "Geneva", "Verdana", sans-serif;
  font-size: 14px;
  transition: background 0.3s, color 0.3s;
}

/* ── Layout ── */
.layout {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1rem 1rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  align-items: center;
}

/* ── Header ── */
.topbar {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  padding: 0.5rem 0;
  background: var(--panel-bg);
  border: 2px solid;
  border-color: var(--panel-hi) var(--panel-lo) var(--panel-lo) var(--panel-hi);
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo-icon {
  font-size: 1.5rem;
  line-height: 1;
}

h1 {
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--text);
}

.subtitle {
  font-family: "Courier New", "Courier", monospace;
  font-size: 0.68rem;
  color: var(--text-dim);
  letter-spacing: 0.06em;
}

/* ── Dashboard stats ── */
.dashboard {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.5rem;
  width: 100%;
  max-width: 600px;
}

.stat-card {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.6rem;
  background: var(--panel-bg);
  border: 2px solid;
  border-color: var(--panel-lo) var(--panel-hi) var(--panel-hi) var(--panel-lo);
  transition: background 0.3s;
}

.stat-card:hover {
  background: var(--panel-inner-hi);
}

.stat-icon {
  font-size: 1.1rem;
  flex-shrink: 0;
  line-height: 1;
}

.stat-info {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.stat-label {
  font-size: 0.6rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-dim);
  white-space: nowrap;
}

.stat-value {
  font-family: "Courier New", "Courier", monospace;
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ── Controls bar ── */
.controls-bar {
  display: flex;
  align-items: flex-end;
  gap: 0.5rem;
  flex-wrap: wrap;
  justify-content: center;
  width: 100%;
  max-width: 600px;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.controls-bar label {
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-dim);
  padding-left: 0.15rem;
}

select,
input[type="number"] {
  background: var(--input-bg);
  border: 2px solid;
  border-color: var(--select-border-lo) var(--select-border-hi) var(--select-border-hi) var(--select-border-lo);
  padding: 0.35rem 0.5rem;
  color: var(--text);
  font-family: inherit;
  font-size: 0.85rem;
  outline: none;
  transition: background 0.2s;
}

select {
  cursor: pointer;
}

select option {
  background: var(--select-bg);
  color: var(--text);
}

select:focus,
input[type="number"]:focus {
  outline: 1px dotted var(--text);
  outline-offset: -4px;
}

input[type="number"] {
  width: 5rem;
}

button#new-game {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.4rem 1rem;
  background: var(--btn-bg);
  border: 2px solid;
  border-color: var(--btn-hi) var(--btn-lo) var(--btn-lo) var(--btn-hi);
  color: var(--text);
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.1s;
}

button#new-game:hover {
  background: var(--panel-inner-hi);
}

button#new-game:active {
  border-color: var(--btn-lo) var(--btn-hi) var(--btn-hi) var(--btn-lo);
  padding: 0.45rem 0.95rem 0.35rem 1.05rem;
}

/* Custom settings */
.custom-settings {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.custom-settings-hidden {
  display: none;
}

/* ── Board ── */
.board-panel {
  overflow: auto;
  padding: 0.5rem;
  background: var(--panel-bg);
  border: 3px solid;
  border-color: var(--panel-lo) var(--panel-hi) var(--panel-hi) var(--panel-lo);
  transition: background 0.3s;
  max-width: 100%;
  -webkit-overflow-scrolling: touch;
}

.board {
  display: grid;
  gap: 1px;
  width: max-content;
  background: var(--cell-revealed-border);
  padding: 0;
  touch-action: manipulation;
  user-select: none;
  -webkit-user-select: none;
}

.cell {
  width: var(--cell-size);
  height: var(--cell-size);
  padding: 0;
  margin: 0;
  border: 2px solid;
  border-color: var(--cell-hi) var(--cell-lo) var(--cell-lo) var(--cell-hi);
  border-radius: 0;
  font-family: "Courier New", "Courier", monospace;
  font-weight: 700;
  font-size: 0.95rem;
  line-height: 1;
  color: transparent;
  background: var(--cell-bg);
  cursor: pointer;
  user-select: none;
  -webkit-user-select: none;
  display: flex;
  align-items: center;
  justify-content: center;
}

.cell:hover {
  background: var(--panel-inner-hi);
}

.cell:active {
  border-color: var(--cell-lo) var(--cell-hi) var(--cell-hi) var(--cell-lo);
  padding-top: 1px;
  padding-left: 1px;
}

.cell.active {
  outline: 2px dotted var(--accent);
  outline-offset: -4px;
  z-index: 2;
}

.cell.revealed {
  background: var(--cell-revealed-bg);
  border: 1px solid var(--cell-revealed-border);
  cursor: default;
}

.cell.revealed:hover {
  background: var(--cell-revealed-bg);
}

.cell.flagged {
  color: var(--cell-flag-color);
  font-size: 1rem;
}

.cell.wrong-flag {
  color: var(--danger);
  background: var(--cell-mine-bg);
  animation: wrong-flag-anim 0.4s ease-out backwards;
}

.cell.mine {
  color: var(--danger);
  font-size: 1rem;
  background: var(--cell-mine-bg);
}

/* ── Win/Loss sweep animations ── */
.cell.mine-sweep {
  animation: mine-sweep-anim 0.45s ease-out backwards;
}

@keyframes mine-sweep-anim {
  0% {
    background: var(--cell-revealed-bg);
    color: transparent;
  }
  45% {
    background: #ee2222;
  }
  100% {
    background: var(--cell-mine-bg);
  }
}

.cell.flag-sweep {
  animation: flag-sweep-anim 0.35s ease-out backwards;
}

@keyframes wrong-flag-anim {
  0% {
    background: var(--cell-bg);
    color: var(--cell-flag-color);
  }
  100% {
    background: var(--cell-mine-bg);
    color: var(--danger);
  }
}

@keyframes flag-sweep-anim {
  0% {
    color: transparent;
  }
  60% {
    background: var(--panel-inner-hi);
  }
}

/* Number colors — classic minesweeper */
.cell.n1 { color: var(--n1); }
.cell.n2 { color: var(--n2); }
.cell.n3 { color: var(--n3); }
.cell.n4 { color: var(--n4); }
.cell.n5 { color: var(--n5); }
.cell.n6 { color: var(--n6); }
.cell.n7 { color: var(--n7); }
.cell.n8 { color: var(--n8); }

/* ── Theme toggle ── */
.theme-toggle {
  position: absolute;
  right: 0.5rem;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  padding: 0;
  background: var(--btn-bg);
  border: 2px solid;
  border-color: var(--btn-hi) var(--btn-lo) var(--btn-lo) var(--btn-hi);
  cursor: pointer;
  transition: background 0.1s;
}

.theme-toggle:hover {
  background: var(--panel-inner-hi);
}

.theme-toggle:active {
  border-color: var(--btn-lo) var(--btn-hi) var(--btn-hi) var(--btn-lo);
}

.theme-toggle-icon {
  font-size: 1rem;
  line-height: 1;
}

/* ── Footer ── */
.footer {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  justify-content: center;
  font-size: 0.7rem;
  color: var(--text-dim);
  letter-spacing: 0.02em;
  padding-top: 0.25rem;
}

.footer .sep {
  opacity: 0.3;
}

/* ── Mobile / Touch ── */
@supports (padding: max(0px)) {
  .layout {
    padding-left: max(0.5rem, env(safe-area-inset-left));
    padding-right: max(0.5rem, env(safe-area-inset-right));
    padding-bottom: max(1rem, env(safe-area-inset-bottom));
  }
}

.theme-toggle,
button#new-game {
  min-height: 44px;
  min-width: 44px;
}

.cell {
  min-height: max(var(--cell-size), 32px);
  min-width: max(var(--cell-size), 32px);
}

/* ── Responsive ── */
@media (max-width: 640px) {
  .layout {
    padding: 0.75rem 0.5rem;
  }

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

  .controls-bar {
    flex-direction: column;
    align-items: stretch;
  }

  .control-group {
    width: 100%;
  }

  select,
  input[type="number"] {
    width: 100%;
    min-height: 44px;
    font-size: 16px;
  }

  button#new-game {
    width: 100%;
    justify-content: center;
    min-height: 48px;
  }

  .custom-settings {
    flex-direction: column;
  }

  h1 {
    font-size: 1.1rem;
  }

  :root {
    --cell-size: 1.75rem;
  }

  .footer {
    display: none;
  }

  .stat-card {
    min-height: 44px;
  }
}

@media (max-width: 380px) {
  :root {
    --cell-size: 1.5rem;
  }

  .cell {
    font-size: 0.75rem;
    min-height: max(1.5rem, 36px);
    min-width: max(1.5rem, 36px);
  }

  .board {
    gap: 1px;
  }
}