/* --- Base & Theme --- */
:root{
  --bg: #fafafa;
  --surface: #ffffff;
  --text: #111827;
  --muted: #6b7280;
  --accent: #2563eb;
  --danger: #dc2626;
  --ok: #059669;
  --grid-gap: 4px;
  --cell-size: 2.2rem;
  --radius: 14px;
  --shadow: 0 8px 24px rgba(0,0,0,.08);
}
@media (prefers-color-scheme: dark){
  :root{
    --bg: #0b0f14;
    --surface: #0f172a;
    --text: #e5e7eb;
    --muted: #9ca3af;
    --accent: #60a5fa;
    --danger: #f87171;
    --ok: #34d399;
    --shadow: 0 10px 28px rgba(0,0,0,.35);
  }
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font: 15px/1.4 system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Noto Sans, sans-serif;
  color: var(--text);
  background: radial-gradient(1200px 800px at 10% -10%, rgba(99,102,241,.08), transparent 60%),
              radial-gradient(1200px 800px at 110% 10%, rgba(14,165,233,.10), transparent 60%),
              var(--bg);
  display:flex;
  flex-direction:column;
  align-items:center;
  gap: 18px;
  padding: 18px;
}

/* --- Header --- */
.topbar{
  width:min(1100px, 96vw);
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 14px 16px;
  display:grid;
  grid-template-columns: 1fr auto;
  gap: 10px 16px;
  align-items:center;
}
.title{ margin:0; font-size: clamp(18px, 3vw, 22px); }
.controls{
  display:flex; flex-wrap:wrap; gap:10px; align-items:center; justify-content:flex-end;
}
.control{
  display:flex; gap:6px; align-items:center; color:var(--muted);
  background: linear-gradient(180deg, rgba(255,255,255,.06), transparent);
  padding:6px 8px; border-radius: 10px;
}
.controls select, .controls input[type=number]{
  appearance:none; border:1px solid color-mix(in oklab, var(--muted) 25%, transparent);
  background:transparent; color:var(--text); border-radius:10px; padding:6px 8px; min-width: 60px;
}
.controls .switch{gap:8px}
.controls .face{
  font-size:20px; line-height:1; padding:8px 10px; border-radius: 12px; border:0;
  background: color-mix(in oklab, var(--accent) 12%, var(--surface));
  box-shadow: var(--shadow); cursor:pointer;
}
.controls .face:active{ transform: translateY(1px) }
.custom.hidden{ display:none }
.custom{ display:flex; gap:6px; align-items:center }
.custom label{ display:flex; gap:6px; align-items:center }
.custom input{ width: 70px }

.status{
  grid-column: 1 / -1;
  display:flex; gap: 18px; align-items:center; flex-wrap:wrap;
  color:var(--muted);
}
.stat{ display:flex; gap:8px; align-items:center; background: color-mix(in oklab, var(--surface), transparent 0%); padding:6px 12px; border-radius: 10px; }
.counter{ font-variant: tabular-nums; font-weight: 600; color:var(--text) }
.label{ font-size: 12px; text-transform: uppercase; letter-spacing:.06em }

/* --- Grid --- */
main{ width: min(1100px, 96vw) }
.grid{
  --cols: 9;
  display:grid;
  grid-template-columns: repeat(var(--cols), var(--cell-size));
  gap: var(--grid-gap);
  justify-content:center;
  background: var(--surface);
  border-radius: var(--radius);
  padding: 10px;
  box-shadow: var(--shadow);
  outline: none;
}
.cell{
  width: var(--cell-size);
  height: var(--cell-size);
  display:grid; place-items:center;
  border-radius: 8px;
  border:1px solid color-mix(in oklab, var(--muted) 30%, transparent);
  background: linear-gradient(180deg, color-mix(in oklab, var(--surface), white 4%), color-mix(in oklab, var(--surface), black 2%));
  cursor:pointer;
  user-select:none;
  font-weight:700;
  font-size: calc(var(--cell-size) * .46);
  line-height:1;
  transition: transform .06s ease, background .2s ease, border-color .2s ease;
}
.cell.hidden:active{ transform: translateY(1px) }
.cell.revealed{
  background: color-mix(in oklab, var(--surface), black 6%);
  border-color: color-mix(in oklab, var(--muted) 50%, transparent);
}
.cell.flag::after{ content:"🚩"; font-size: calc(var(--cell-size)*.52); }
.cell.question::after{ content:"?"; font-size: calc(var(--cell-size)*.48); color: var(--muted) }
.cell.mine::after{ content:"💣"; font-size: calc(var(--cell-size)*.50); }
.cell.exploded{ background: color-mix(in oklab, var(--danger) 15%, var(--surface)); }
.cell.correct-flag{ background: color-mix(in oklab, var(--ok) 18%, var(--surface)); }
.cell:focus-visible{ outline: 2px solid var(--accent); outline-offset: 2px }

/* Number colors */
.cell[data-adj="1"]{ color:#1976d2 }
.cell[data-adj="2"]{ color:#388e3c }
.cell[data-adj="3"]{ color:#d32f2f }
.cell[data-adj="4"]{ color:#512da8 }
.cell[data-adj="5"]{ color:#bf360c }
.cell[data-adj="6"]{ color:#00838f }
.cell[data-adj="7"]{ color:#5d4037 }
.cell[data-adj="8"]{ color:#7b1fa2 }

.footer{ color:var(--muted) }
.visually-hidden{ position:absolute !important; width:1px; height:1px; padding:0; margin:-1px; overflow:hidden; clip:rect(0,0,0,0); white-space:nowrap; border:0; }

/* Responsive cell sizing */
@media (max-width: 700px){
  .grid{ --cell-size: 2rem }
}
@media (max-width: 520px){
  .grid{ --cell-size: 1.8rem }
}


/* --- Explicit theme overrides --- */
:root[data-theme="light"]{
  --bg: #fafafa;
  --surface: #ffffff;
  --text: #111827;
  --muted: #6b7280;
  --accent: #2563eb;
  --danger: #dc2626;
  --ok: #059669;
  --shadow: 0 8px 24px rgba(0,0,0,.08);
}
:root[data-theme="dark"]{
  --bg: #0b0f14;
  --surface: #0f172a;
  --text: #e5e7eb;
  --muted: #9ca3af;
  --accent: #60a5fa;
  --danger: #f87171;
  --ok: #34d399;
  --shadow: 0 10px 28px rgba(0,0,0,.35);
}

/* --- Help Modal --- */
.modal.hidden{ display:none }
.modal{ position:fixed; inset:0; z-index:50; display:grid; grid-template-rows: 1fr; }
.modal__backdrop{
  position:absolute; inset:0;
  background: rgba(0,0,0,.4);
  backdrop-filter: blur(1px);
}
.modal__panel{
  position:relative;
  margin:auto;
  width:min(680px, 92vw);
  max-height: 86vh;
  background: var(--surface);
  color: var(--text);
  border-radius: 16px;
  box-shadow: 0 20px 50px rgba(0,0,0,.3);
  display:flex; flex-direction:column;
}
.modal__header{ display:flex; align-items:center; justify-content:space-between; padding:14px 16px; border-bottom:1px solid color-mix(in oklab, var(--muted) 30%, transparent) }
.modal__content{ padding:14px 16px; overflow:auto }
.modal__close{
  font-size:20px; line-height:1; padding:4px 10px; border-radius: 10px; border:0;
  background: color-mix(in oklab, var(--accent) 12%, var(--surface)); cursor:pointer;
}
.controls .help{
  font-size:16px; line-height:1; padding:8px 10px; border-radius: 10px; border:0;
  background: color-mix(in oklab, var(--accent) 12%, var(--surface)); box-shadow: var(--shadow); cursor:pointer;
}
.modal__content ul{ margin: .4rem 0 .8rem 1.1rem }
.modal__content h3{ margin: .6rem 0 .2rem }

/* Music controls */
.controls input[type=range]{
  width: 120px;
  accent-color: var(--accent);
}

/* Confetti canvas overlay */
.confetti{
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 60;
}
.confetti.hidden{ display:none }

/* Shake on lose */
@keyframes shake {
  10%, 90% { transform: translate3d(-1px, 0, 0); }
  20%, 80% { transform: translate3d(2px, 0, 0); }
  30%, 50%, 70% { transform: translate3d(-4px, 0, 0); }
  40%, 60% { transform: translate3d(4px, 0, 0); }
}
body.shake { animation: shake 0.6s cubic-bezier(.36,.07,.19,.97) both; }