/* Classic theme — warm, elegant, modern take on the original */
[data-theme="classic"] {
  /* Uses :root defaults — warm beige/cream palette */
  --color-wall: #766248; /* darkened from #8B7355 - clears the 3.5:1 wall floor vs BOTH cell bgs (5.14 / 3.60) */
  /* Lightest touch (this is the default everyone sees): a crisper reveal
     cascade. */
  --anim-reveal-dur: 0.18s;
  /* The default blue/green mirror borders and the plate border fall below the
     3:1 legibility floor on the light beige cells (1.9-2.8:1); nudge just those
     three darker, same hues, to clear it. All other markers stay default. */
  --marker-mirror-0: rgba(28, 110, 200, 0.95);
  --marker-mirror-2: rgba(18, 140, 82, 0.97);
  --marker-plate-border: rgba(214, 40, 40, 0.92);
}

/* Faint paper grain on the page surround — barely-there warmth, not a pattern. */
[data-theme="classic"] body::before {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='pg'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23pg)'/%3E%3C/svg%3E");
  background-size: 140px 140px;
  background-repeat: repeat;
  mix-blend-mode: multiply;
  opacity: 0.06;
}

/* Satisfying pop on cell reveal */
[data-theme="classic"] .cell.revealed.revealing {
  animation: classicPop 0.2s ease-out;
}

@keyframes classicPop {
  0% { transform: scale(0.92); }
  50% { transform: scale(1.04); }
  100% { transform: scale(1); }
}