:root {
  /* Tiles and keys scale with the visible height so the game fits one screen. */
  --tile: min(12.5vw, 52px, 6.1vh);
  --key-h: clamp(34px, 6vh, 54px);
  --bg: #fbf8f3;
  --fg: #2a211b;
  --muted: #7d7066;
  --border: #d9cfc4;
  --border-strong: #8f8175;
  --tile-bg: #ffffff;
  --plain: #e9e2d9;
  --plain-fg: #2a211b;
  --match: #7a4b24;
  --match-fg: #ffffff;
  --changed: #e8b634;
  --key-bg: #e4dcd2;
  --key-fg: #2a211b;
  --accent: #7a4b24;
  --danger: #b3412f;
  --dialog-bg: #ffffff;
  --shadow: 0 10px 40px rgba(42, 33, 27, 0.25);
}

@supports (height: 100dvh) {
  :root {
    --tile: min(12.5vw, 52px, 6.1dvh);
    --key-h: clamp(34px, 6dvh, 54px);
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1a1512;
    --fg: #f2ebe4;
    --muted: #a69a8f;
    --border: #3d332c;
    --border-strong: #6d6056;
    --tile-bg: #1a1512;
    --plain: #3a312a;
    --plain-fg: #f2ebe4;
    --match: #9a6333;
    --key-bg: #4a4038;
    --key-fg: #f2ebe4;
    --accent: #c98a52;
    --dialog-bg: #241d19;
    --shadow: 0 10px 40px rgba(0, 0, 0, 0.6);
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
}

body {
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100dvh;
  overflow-x: hidden;
  -webkit-tap-highlight-color: transparent;
}

button {
  font: inherit;
  color: inherit;
  cursor: pointer;
}

/* --- Header ------------------------------------------------------------ */

.topbar {
  width: 100%;
  max-width: 500px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: calc(4px + env(safe-area-inset-top)) 16px 4px;
  border-bottom: 1px solid var(--border);
}

.topbar h1 {
  margin: 0;
  font-size: 1.6rem;
  font-weight: 800;
  letter-spacing: 0.04em;
}

.icon-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 2px solid var(--border-strong);
  background: none;
  font-weight: 700;
  font-size: 1.1rem;
  display: grid;
  place-items: center;
}

/* --- Board ------------------------------------------------------------- */

main {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 6px 16px;
  width: 100%;
}

.puzzle-info {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.puzzle-info strong { color: var(--fg); }

.board {
  display: grid;
  gap: 5px;
}

.row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 5px;
  position: relative;
}

.row .step {
  position: absolute;
  left: -30px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 0.75rem;
  color: var(--muted);
  width: 22px;
  text-align: right;
}

.tile {
  width: var(--tile);
  height: var(--tile);
  border: 2px solid var(--border);
  background: var(--tile-bg);
  display: grid;
  place-items: center;
  font-size: calc(var(--tile) * 0.55);
  font-weight: 800;
  text-transform: uppercase;
  user-select: none;
  position: relative;
}

.tile.ghost { color: var(--border-strong); opacity: 0.45; }
.tile.filled { border-color: var(--border-strong); animation: pop 0.1s; }
.tile.plain { background: var(--plain); border-color: var(--plain); color: var(--plain-fg); }
.tile.match { background: var(--match); border-color: var(--match); color: var(--match-fg); }
.tile.changed { box-shadow: inset 0 -6px 0 var(--changed); }
.tile.start { border-style: dashed; border-color: var(--border-strong); }

.row.reveal .tile { animation: flip 0.45s ease-in-out both; }
.row.reveal .tile:nth-child(2) { animation-delay: 0.08s; }
.row.reveal .tile:nth-child(3) { animation-delay: 0.16s; }
.row.reveal .tile:nth-child(4) { animation-delay: 0.24s; }
.row.shake { animation: shake 0.45s; }
.row.win .tile { animation: bounce 0.6s ease both; }
.row.win .tile:nth-child(2) { animation-delay: 0.1s; }
.row.win .tile:nth-child(3) { animation-delay: 0.2s; }
.row.win .tile:nth-child(4) { animation-delay: 0.3s; }

.goal {
  display: flex;
  align-items: center;
  gap: 8px;
  padding-top: 6px;
  border-top: 2px dotted var(--border);
}

.goal-label {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--muted);
}

.goal-row .tile {
  width: 26px;
  height: 26px;
  font-size: 0.9rem;
}

.actions {
  display: flex;
  gap: 8px;
}

.actions[hidden], .pill[hidden] { display: none; }

.pill {
  border: 2px solid var(--accent);
  background: none;
  color: var(--accent);
  border-radius: 999px;
  padding: 8px 18px;
  font-weight: 700;
}

.pill.armed {
  border-color: var(--danger);
  color: var(--danger);
}

.pill.primary {
  background: var(--accent);
  color: #fff;
}

/* --- Keyboard ---------------------------------------------------------- */

.keyboard {
  width: 100%;
  max-width: 500px;
  padding: 0 6px calc(6px + env(safe-area-inset-bottom));
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.kb-row {
  display: flex;
  gap: 5px;
  justify-content: center;
}

.key {
  flex: 1;
  height: var(--key-h);
  border: 0;
  border-radius: 5px;
  background: var(--key-bg);
  color: var(--key-fg);
  font-weight: 700;
  text-transform: uppercase;
  font-size: 1.05rem;
  user-select: none;
  touch-action: manipulation;
}

.key.wide { flex: 1.5; font-size: 0.8rem; }
.key.poop-letter { box-shadow: inset 0 -4px 0 var(--match); }
.kb-spacer { flex: 0.5; }

/* --- Toasts & effects -------------------------------------------------- */

.toast-area {
  position: fixed;
  top: calc(6px + env(safe-area-inset-top));
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  gap: 6px;
  z-index: 20;
  pointer-events: none;
}

.toast {
  background: var(--fg);
  color: var(--bg);
  padding: 10px 16px;
  border-radius: 6px;
  font-weight: 700;
  text-align: center;
  max-width: calc(100vw - 32px);
  transition: opacity 0.3s;
}

.toast.fade { opacity: 0; }
.toast-detail { font-size: 0.8rem; font-weight: 600; margin-top: 2px; opacity: 0.85; }

.poop-rain {
  position: fixed;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  z-index: 30;
}

.poop-rain span {
  position: absolute;
  top: -60px;
  animation: fall linear forwards;
}

/* --- Dialogs ----------------------------------------------------------- */

.dialog {
  width: min(92vw, 440px);
  max-height: 88dvh;
  border: 0;
  border-radius: 12px;
  background: var(--dialog-bg);
  color: var(--fg);
  box-shadow: var(--shadow);
  padding: 20px 22px;
}

.dialog::backdrop { background: rgba(0, 0, 0, 0.45); }

.dialog h2 { margin: 0 0 10px; font-size: 1.2rem; text-transform: uppercase; letter-spacing: 0.08em; }
.dialog h3 { margin: 18px 0 8px; font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); }
.dialog ul { padding-left: 20px; }
.dialog li { margin: 4px 0; }

.close {
  position: absolute;
  top: 8px;
  right: 10px;
  border: 0;
  background: none;
  font-size: 1.8rem;
  line-height: 1;
  color: var(--muted);
}

.example { display: grid; gap: 4px; justify-content: start; }
.row.small .tile { width: 36px; height: 36px; font-size: 1.1rem; }
.tile.mini {
  display: inline-grid;
  width: 22px;
  height: 22px;
  font-size: 0.8rem;
  vertical-align: middle;
  margin-right: 4px;
}
.legend { line-height: 2; font-size: 0.9rem; }

.result {
  text-align: center;
  padding-bottom: 12px;
  margin-bottom: 12px;
  border-bottom: 1px solid var(--border);
}

.result .big { font-size: 1.6rem; font-weight: 800; margin: 4px 0; }
.result .sub { color: var(--muted); margin: 0 0 10px; }
.result .path {
  font-family: ui-monospace, Menlo, monospace;
  text-transform: uppercase;
  font-weight: 700;
  letter-spacing: 0.05em;
  margin: 6px 0 12px;
  word-spacing: 0.2em;
}

.stat-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  text-align: center;
  gap: 4px;
}

.stat-row .num { font-size: 1.8rem; font-weight: 700; }
.stat-row .lbl { font-size: 0.72rem; color: var(--muted); }

.dist { display: grid; gap: 4px; }

.dist-row {
  display: grid;
  grid-template-columns: 96px 1fr;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
}

.dist-bar {
  background: var(--plain);
  color: var(--plain-fg);
  padding: 2px 6px;
  text-align: right;
  font-weight: 700;
  min-width: 22px;
  justify-self: start;
}

.dist-bar.current { background: var(--match); color: var(--match-fg); }


.history {
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 0.85rem;
  max-height: 180px;
  overflow-y: auto;
}

.history li {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  padding: 5px 0;
  border-bottom: 1px solid var(--border);
}

.history .word { font-weight: 700; text-transform: uppercase; }
.history .res-miss { color: var(--danger); }
.history .empty { color: var(--muted); justify-content: center; }

/* --- Animations -------------------------------------------------------- */

@keyframes pop { 50% { transform: scale(1.1); } }

@keyframes flip {
  0% { transform: rotateX(0); }
  50% { transform: rotateX(90deg); }
  100% { transform: rotateX(0); }
}

@keyframes shake {
  10%, 90% { transform: translateX(-2px); }
  20%, 80% { transform: translateX(4px); }
  30%, 50%, 70% { transform: translateX(-7px); }
  40%, 60% { transform: translateX(7px); }
}

@keyframes bounce {
  0%, 20% { transform: translateY(0); }
  40% { transform: translateY(-24px); }
  60% { transform: translateY(4px); }
  80% { transform: translateY(-6px); }
  100% { transform: translateY(0); }
}

@keyframes fall {
  to { transform: translateY(115vh) rotate(360deg); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}

.close:focus:not(:focus-visible) { outline: none; }