:root {
  --bg: #1f2229;
  --bg-panel: #2a2e37;
  --bg-panel-alt: #353a46;
  --border: #444a57;
  --border-light: #5a6170;
  --text: #f0f3f7;
  --accent: #4796ff;
  --accent-hover: #61a6ff;
  --danger: #d64040;
  --success: #3ba55d;
  --warning: #f5c542;
  --font: system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,sans-serif;
  --cell-size: 34px;
  --transition: 140ms cubic-bezier(.4,.2,.2,1);
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  background: radial-gradient(circle at 40% 30%, #2c313b, #1b1d23);
  color: var(--text);
  font-family: var(--font);
  -webkit-font-smoothing: antialiased;
}

h1 {
  margin: 0;
  font-size: clamp(1.25rem, 2.2vw, 1.9rem);
  font-weight: 600;
  letter-spacing: .5px;
}

.top-bar {
  display: flex;
  flex-direction: column;
  gap: .75rem;
  padding: 1rem clamp(1rem, 3vw, 2.5rem);
  background: linear-gradient(145deg,#262a32,#1e2127);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}

.controls {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}







.status-panels {
  display: flex;
  gap: .75rem;
}

.panel {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  min-width: 86px;
  padding: .4rem .75rem .55rem;
  border-radius: .65rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
}

.panel .label {
  font-size: .6rem;
  letter-spacing: .15em;
  text-transform: uppercase;
  opacity: .75;
}

.panel .value {
  font-family: "DM Mono", "Roboto Mono", Consolas, monospace;
  font-size: 1.4rem;
  font-weight: 600;
  margin-top: .1rem;
  letter-spacing: .05em;
  text-shadow: 0 0 6px #000;
}

.reset-btn {
  background: var(--bg-panel);
  border: 2px solid var(--border-light);
  width: 54px;
  height: 54px;
  border-radius: 14px;
  font-size: 1.6rem;
  cursor: pointer;
  box-shadow: 0 4px 16px -6px rgba(0,0,0,.55), inset 0 2px 0 rgba(255,255,255,.08);
  transition: background var(--transition), transform var(--transition), border-color var(--transition);
}
.reset-btn:hover {
  background: var(--bg-panel-alt);
  transform: translateY(-2px);
}
.reset-btn:active {
  transform: translateY(0);
}

main {
  padding: 1.5rem clamp(.75rem,3vw,2.5rem) 3rem;
  max-width: 1400px;
  margin: 0 auto;
}

.board-wrapper {
  margin: 0 auto;
  max-width: 100%;
  overflow: auto;
  background: #252a32;
  padding: 1rem;
  border-radius: 1rem;
  border: 1px solid var(--border);
  box-shadow: 0 6px 28px -10px rgba(0,0,0,.6);
}

.board {
  display: grid;
  gap: 4px;
  place-content: center;
  user-select: none;
  touch-action: none;
}

.cell {
  width: var(--cell-size);
  height: var(--cell-size);
  font-family: "DM Mono","Roboto Mono",Consolas,monospace;
  font-size: 1.05rem;
  font-weight: 600;
  border-radius: 6px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(145deg,#525b66,#414851);
  border: 2px solid #6d7683;
  position: relative;
  transition: background var(--transition), transform var(--transition), filter var(--transition), border-color var(--transition);
  outline: none;
}

.cell.covered:active {
  transform: translateY(1px);
  filter: brightness(.9);
}

.cell:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 0;
}

.cell.revealed {
  background: #cfd6df;
  color: #222;
  border-color: #b3bac5;
  box-shadow: inset 0 2px 2px rgba(0,0,0,.2);
  cursor: default;
}

.cell.flagged {
  background: linear-gradient(145deg,#325680,#274664);
  border-color: #4a6f95;
}

.cell.mine.revealed {
  background: radial-gradient(circle at 40% 35%, #f44336, #7d1616 70%);
  color: #fff;
  animation: minepop 280ms ease;
  text-shadow: 0 0 5px #fff;
}

@keyframes minepop {
  0% { transform: scale(.4); opacity: .3; }
  65% { transform: scale(1.15); }
  100% { transform: scale(1); opacity: 1; }
}

.cell .content {
  pointer-events: none;
  transform: translateY(-1px);
}

.cell[data-value="1"].revealed { color: #0b60d6; }
.cell[data-value="2"].revealed { color: #1b8e2e; }
.cell[data-value="3"].revealed { color: #d62626; }
.cell[data-value="4"].revealed { color: #182a87; }
.cell[data-value="5"].revealed { color: #7d1f1f; }
.cell[data-value="6"].revealed { color: #0b7d7d; }
.cell[data-value="7"].revealed { color: #000; }
.cell[data-value="8"].revealed { color: #555; }

.cell.zero.revealed {
  color: transparent;
}

.flag-icon {
  font-size: 1.15rem;
  filter: drop-shadow(0 0 2px rgba(255,255,255,.1));
}

.mine-icon {
  font-size: 1.2rem;
}

.message {
  margin: 0 auto 1rem;
  min-height: 2.2rem;
  font-size: 1.05rem;
  text-align: center;
  font-weight: 600;
  letter-spacing: .3px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.message.win { color: var(--success); }
.message.lose { color: var(--danger); }

.help {
  margin-top: 2rem;
  background: #2a3039;
  border: 1px solid var(--border);
  padding: .9rem 1.1rem;
  border-radius: .8rem;
  max-width: 680px;
}

.help summary {
  cursor: pointer;
  font-weight: 600;
  font-size: .95rem;
  letter-spacing: .5px;
}

.help ul {
  margin: .75rem 0 0;
  padding-left: 1.25rem;
  line-height: 1.4;
  font-size: .9rem;
}

.footer {
  text-align: center;
  padding: 2.5rem 1rem 3rem;
  font-size: .8rem;
  opacity: .65;
  letter-spacing: .5px;
}

/* Scrollbar styling for board overflow */
.board-wrapper::-webkit-scrollbar {
  height: 10px;
  width: 10px;
}
.board-wrapper::-webkit-scrollbar-track {
  background: #202328;
  border-radius: 10px;
}
.board-wrapper::-webkit-scrollbar-thumb {
  background: #3e4651;
  border-radius: 10px;
}
.board-wrapper::-webkit-scrollbar-thumb:hover {
  background: #515c68;
}

/* Responsive tweaks */
@media (max-width: 760px) {
  :root { --cell-size: 32px; }
  .controls {
    flex-direction: column;
    align-items: stretch;
  }
  .status-panels {
    order: 3;
  }
  .reset-btn {
    order: 2;
    align-self: center;
  }
}

@media (max-width: 480px) {
  :root { --cell-size: 30px; }
  .panel { min-width: 74px; }
}  gap: 1rem;
  background: var(--panel);
  border: 1px solid var(--border);
  padding: 0.75rem 1rem 1rem;
  border-radius: 10px;
  align-items: center;
  justify-content: space-between;
  max-width: 900px;
  margin: 0 auto 1rem;
}

.controls form {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  align-items: flex-end;
}

.controls label {
  display: flex;
  flex-direction: column;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  gap: 0.25rem;
  font-weight: 600;
  color: #9fb0c2;
}

.controls input[type=number] {
  background: #11161a;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.35rem 0.5rem;
  border-radius: 6px;
  width: 70px;
  font-size: 0.9rem;
}

.controls button {
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 0.55rem 1rem;
  font-size: 0.9rem;
  border-radius: 6px;
  cursor: pointer;
  font-weight: 600;
  transition: background 0.2s;
}

.controls button:hover {
  background: #1e8ad4;
}

.status {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  font-size: 0.9rem;
  min-width: 140px;
}

.legend {
  font-size: 0.7rem;
  opacity: 0.75;
  width: 100%;
  text-align: center;
  margin-top: 0.25rem;
}

#board {
  display: grid;
  gap: 2px;
  background: var(--panel);
  border: 2px solid var(--border);
  padding: 6px;
  width: max-content;
  margin: 0 auto 2rem;
  border-radius: 12px;
  position: relative;
  box-shadow: 0 4px 18