/* Layout and structure. Colors and marks come from themes.css. */
*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }

html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  min-height: 100vh;
  min-height: 100dvh;
  user-select: none;
  -webkit-user-select: none;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.4 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  font-family: var(--font);
}
main {
  max-width: 520px;
  margin: 0 auto;
  padding: max(16px, env(safe-area-inset-top)) max(16px, env(safe-area-inset-right))
           max(24px, env(safe-area-inset-bottom)) max(16px, env(safe-area-inset-left));
}
section { display: flex; flex-direction: column; gap: 14px; }
h1, h2, p { margin: 0; }
button { font: inherit; color: inherit; }

/* Home */
.logo {
  display: flex; align-items: center; justify-content: center; gap: 10px;
  margin: 18px 0 8px;
  font-size: 30px; font-weight: 800; letter-spacing: -.5px;
}
.logo svg { width: 34px; height: 34px; }
.card {
  display: flex; flex-direction: column; gap: 6px;
  background: var(--card);
  border-radius: 18px;
  padding: 18px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, .08), 0 8px 24px rgba(0, 0, 0, .05);
}
.card h2 { font-size: 19px; font-weight: 800; }
.card .btn { margin-top: 8px; }
.card-head { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.pill {
  background: var(--pill);
  border-radius: 999px;
  padding: 3px 10px;
  font-size: 14px; font-weight: 700;
  white-space: nowrap;
}
.muted { color: var(--muted); font-size: 14px; }
.daily-result { font-size: 18px; font-weight: 800; }
.totals {
  display: flex; justify-content: space-around;
  padding: 6px 0;
  color: var(--muted); font-size: 13px; text-align: center;
}
.totals b { display: block; color: var(--ink); font-size: 22px; font-weight: 800; line-height: 1.3; }

/* Theme picker: each button carries its own data-theme, so its preview uses that theme's variables. */
.themes { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.theme-opt {
  display: flex; flex-direction: column; align-items: center; gap: 8px;
  min-width: 0;
  border: 0; border-radius: 14px;
  padding: 12px 4px 10px;
  background: var(--bg); color: var(--ink);
  font-family: var(--font); font-size: 14px; font-weight: 700;
  box-shadow: inset 0 0 0 1px var(--line-thin);
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}
.theme-opt[aria-pressed="true"] { box-shadow: inset 0 0 0 3px var(--ink); }
.theme-opt:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }
.pv { display: grid; grid-template-columns: repeat(2, 24px); gap: var(--pv-gap); }
.pv i {
  display: grid; place-items: center;
  height: 24px;
  border-radius: var(--tile-r);
  box-shadow: var(--tile-fx);
  background-image: var(--tile-gloss);
}
.pv svg { width: 72%; height: 72%; }

/* Buttons */
.btn {
  display: block; width: 100%;
  border: 0; border-radius: 14px;
  padding: 15px;
  background: var(--ink); color: var(--on-ink);
  font-weight: 700; font-size: 16px; line-height: 1.2;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  transition: transform .08s, opacity .15s;
}
.btn:active { transform: scale(.98); }
.btn.alt { background: transparent; color: var(--ink); box-shadow: inset 0 0 0 2px var(--ink); }
.btn.ghost { background: transparent; color: var(--muted); }
.btn:disabled { background: var(--pill); color: var(--muted); box-shadow: none; cursor: default; transform: none; }
.btn:focus-visible, .back:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }

/* Play */
.bar {
  display: grid; grid-template-columns: 44px 1fr auto 44px; align-items: center; gap: 8px;
  font-weight: 700;
}
.back { /* also the sound toggle, .back.snd */
  width: 44px; height: 44px;
  border: 0; border-radius: 12px;
  background: var(--card);
  box-shadow: 0 1px 3px rgba(0, 0, 0, .1);
  font-size: 22px; line-height: 1;
  cursor: pointer;
}
.mode { font-size: 17px; }
.hearts { display: inline-flex; gap: 3px; }
.hearts svg { width: 24px; height: 24px; color: var(--heart); }
.hearts svg.off { color: var(--heart-off); }
.sub {
  display: flex; justify-content: space-between;
  color: var(--muted); font-size: 15px; font-weight: 600;
  font-variant-numeric: tabular-nums;
}
.sub.center { justify-content: center; }
.hint { text-align: center; color: var(--muted); font-size: 14px; }
.sub { align-items: center; }
.hint-btn {
  border: 0; border-radius: 999px;
  padding: 6px 14px;
  background: var(--card); color: var(--ink);
  box-shadow: 0 1px 3px rgba(0, 0, 0, .12);
  font-size: 15px; font-weight: 700;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}
.hint-btn:active { transform: scale(.96); }
.hint-btn:disabled { opacity: .4; cursor: default; transform: none; }
.hint-btn:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }
.hint.ask { color: var(--ink); font-size: 17px; font-weight: 700; }

/* Board: n x n buttons; --n is set by renderBoard. */
.board {
  /* ponytail: 190px ≈ #play's bar + counters + tip + padding; re-measure if that chrome changes. */
  --board-w: min(100vw - 32px, 480px, 100dvh - 190px);
  width: var(--board-w);
  align-self: center;
  display: grid;
  grid-template-columns: repeat(var(--n, 8), 1fr);
  border: 3px solid var(--line-thick);
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 6px 20px rgba(0, 0, 0, .08);
  touch-action: manipulation;
  -webkit-touch-callout: none;
  -webkit-tap-highlight-color: transparent;
}
.board.small { --board-w: min(100vw - 120px, 260px); }
/* Each square draws only its right and bottom line, so every line is drawn once:
   3px between colors, 1px inside a color, none against the board's own border. */
.sq {
  appearance: none;
  min-width: 0; margin: 0; padding: 0;
  aspect-ratio: 1;
  display: grid; place-items: center;
  border: 0 solid var(--line-thin);
  border-right-width: 1px;
  border-bottom-width: 1px;
  font-size: calc(var(--board-w) / var(--n, 8) * .62);
  line-height: 1;
  cursor: pointer;
}
.sq.r3 { border-right: 3px solid var(--line-thick); }
.sq.b3 { border-bottom: 3px solid var(--line-thick); }
.sq.r0 { border-right-width: 0; }
.sq.b0 { border-bottom-width: 0; }
.sq svg { width: 68%; height: 68%; pointer-events: none; }
.sq:focus-visible { outline: 3px solid var(--focus); outline-offset: -3px; }
@media (hover: hover) { .sq.unknown:hover { filter: brightness(1.06); } }
.board.done .sq.safe::after { content: none; }

/* Result */
.banner {
  margin-top: 12px;
  border-radius: 16px;
  padding: 18px 10px;
  text-align: center;
  font-size: 24px; font-weight: 900; letter-spacing: .5px; text-transform: uppercase;
  background: var(--banner-won); color: var(--banner-won-ink);
}
.banner.flawless { background: var(--banner-flawless); color: var(--banner-flawless-ink); }
.banner.lost { background: var(--banner-lost); color: var(--banner-lost-ink); }
.totals .hearts svg { width: 20px; height: 20px; vertical-align: -3px; }

dialog.ask {
  width: min(100% - 32px, 340px);
  margin: auto; padding: 0; border: 0;
  background: none; color: inherit;
}
dialog.ask::backdrop { background: rgba(0, 0, 0, .35); }
dialog.ask .card { text-align: center; }

.loading {
  position: fixed; inset: 0; z-index: 10;
  display: grid; place-items: center;
  background: var(--veil);
  font-size: 20px; font-weight: 800;
}

/* Hints, and the guide's squares to play */
.sq.hl { outline: 3px dashed var(--ink); outline-offset: -6px; }
/* The guide talks in up to 3 lines, so its board gives up the room. 270px ≈ #play's 190px + 80px of text. */
#play.guide .board { --board-w: min(100vw - 32px, 480px, 100dvh - 270px); }
#play.guide .sq.hl { animation: hl-pulse .9s ease-in-out infinite alternate; }
@keyframes hl-pulse { to { outline-offset: -3px; outline-color: var(--focus); } }

/* Motion: app.js adds an fx-* class for a moment; each theme's keyframes live in themes.css. */
.confetti { position: fixed; inset: 0; z-index: 20; overflow: hidden; pointer-events: none; }
.confetti i { position: absolute; top: -20px; width: 10px; height: 14px; }
@keyframes fall { to { transform: translate(var(--dx), 110vh) rotate(var(--spin)); } }
@media (prefers-reduced-motion: reduce) {
  [class*="fx-"], [class*="fx-"] * { animation: none !important; }
  .confetti { display: none; }
}