:root {
  --bg: #f3f7fa;
  --panel: #ffffff;
  --ink: #1d2730;
  --muted: #5a6b78;
  --accent: #8fbce6;
  --accent-ink: #14324e;
  --cell: #ffffff;
  --cell-border: #c4d2dd;
  --sel: #ffe58a;
  --bad: #ff8a8a;
  --found-single: #a9d0ee;
  --secret: #b39dff;
  --hint: #ffb347;
  --danger: #c0392b;
  --radius: 6px;
}
html.dark {
  --bg: #131a20;
  --panel: #1d2831;
  --ink: #e8eff4;
  --muted: #97a9b8;
  --accent: #a9cff0;
  --accent-ink: #10283f;
  --cell: #222f3a;
  --cell-border: #3d4f5e;
  --sel: #7a6a20;
  --bad: #7d3232;
  --found-single: #31516f;
  --secret: #4a3d78;
  --hint: #8a5a20;
  --danger: #e07b6d;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--ink);
  min-height: 100vh;
}

.app-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 0.7rem 1rem;
  background: var(--accent); color: var(--accent-ink);
  position: sticky; top: 0; z-index: 10;
}
.app-head h1 { font-size: 1.25rem; margin: 0; }
.head-actions { display: flex; align-items: center; gap: 0.2rem; }

/* ---------- language menu ---------- */
.lang-wrap { position: relative; }
#btn-lang { font-size: 1.4rem; line-height: 1; }
.lang-menu {
  position: absolute; right: 0; top: calc(100% + 6px);
  min-width: 10rem; z-index: 40;
  background: var(--panel); color: var(--ink);
  border: 1px solid var(--cell-border); border-radius: var(--radius);
  box-shadow: 0 8px 28px rgba(0,0,0,0.22);
  overflow: hidden;
}
.lang-option {
  display: flex; align-items: center; gap: 0.55rem; width: 100%;
  padding: 0.6rem 0.9rem; font: inherit; text-align: left;
  background: none; border: none; color: var(--ink); cursor: pointer;
}
.lang-option:hover, .lang-option.active { background: var(--cell-border); }
.lang-option.active { font-weight: 700; }
.lang-option .flag { font-size: 1.2rem; }

main { max-width: 760px; margin: 0 auto; padding: 1rem; }
.screen { display: none; }
.screen.active { display: block; }
.hidden { display: none !important; }

/* ---------- generic widgets ---------- */
.btn {
  font: inherit; cursor: pointer;
  background: var(--accent); color: var(--accent-ink);
  border: none; border-radius: var(--radius);
  padding: 0.6rem 1rem; font-weight: 600;
}
.btn.ghost { background: transparent; color: var(--accent); border: 2px solid var(--accent); }
.btn.big { font-size: 1.1rem; padding: 0.9rem 1.4rem; width: 100%; }
.btn-icon {
  font: inherit; font-size: 1.3rem; cursor: pointer;
  background: transparent; border: none; color: inherit; padding: 0.2rem 0.4rem;
}
.btn-icon.del { color: var(--danger); }
.btn:disabled { opacity: 0.5; }

label { display: block; margin: 0.7rem 0 0.25rem; font-weight: 600; color: var(--ink); }
input[type=text], input[type=number], input[type=file], select, textarea {
  font: inherit; width: 100%; padding: 0.55rem 0.7rem; margin-top: 0.25rem;
  border: 1px solid var(--cell-border); border-radius: 4px;
  background: var(--panel); color: var(--ink);
}
label.check { display: flex; align-items: center; gap: 0.5rem; font-weight: 500; }
label.check input { width: auto; }
.row { display: flex; gap: 0.7rem; align-items: end; }
.row > * { flex: 1; }
.row .grow { flex: 1; }
fieldset {
  border: 1px solid var(--cell-border); border-radius: var(--radius);
  margin: 1rem 0; padding: 0.4rem 0.9rem 0.9rem;
  background: var(--panel);
}
legend { font-weight: 700; padding: 0 0.4rem; }
h2 { font-size: 1.1rem; color: var(--muted); margin: 1.2rem 0 0.5rem; }

#toast {
  position: fixed; left: 50%; bottom: 1.4rem; transform: translateX(-50%);
  background: var(--ink); color: var(--bg);
  padding: 0.7rem 1.2rem; border-radius: 999px;
  opacity: 0; pointer-events: none; transition: opacity 0.25s;
  max-width: 90vw; text-align: center; z-index: 50;
}
#toast.show { opacity: 0.95; }

/* ---------- home ---------- */
.puzzle-list { list-style: none; padding: 0; margin: 0; }
.puzzle-list li {
  display: flex; align-items: center; gap: 0.4rem;
  background: var(--panel); border: 1px solid var(--cell-border);
  border-radius: var(--radius); margin-bottom: 0.5rem; overflow: hidden;
}
.puzzle-list li.empty { padding: 1rem; color: var(--muted); justify-content: center; }
.puzzle-item {
  flex: 1; text-align: left; background: none; border: none; font: inherit;
  padding: 0.8rem 0.9rem; cursor: pointer; color: var(--ink);
  display: flex; flex-direction: column; gap: 0.15rem;
}
.puzzle-name { font-weight: 700; }
.puzzle-meta { font-size: 0.8rem; color: var(--muted); }

/* ---------- play header ---------- */
.play-head { display: flex; align-items: center; gap: 0.6rem; flex-wrap: wrap; }
.play-title { font-weight: 700; flex: 1; min-width: 8rem; }
.play-stats { display: flex; gap: 0.8rem; align-items: center; font-variant-numeric: tabular-nums; }
.play-actions { display: flex; gap: 0.5rem; margin: 0.6rem 0; }
.push-right { margin-left: auto; }
.timer { color: var(--muted); }

/* ---------- word search grid ---------- */
.ws-grid {
  display: grid;
  grid-template-columns: repeat(var(--cols), 1fr);
  gap: 2px;
  background: var(--cell-border);
  border: 2px solid var(--cell-border);
  border-radius: 4px;
  overflow: hidden;
  user-select: none;
  -webkit-user-select: none;
  max-width: min(100%, 92vh);
  margin: 0 auto;
}
.ws-cell {
  aspect-ratio: 1;
  display: flex; align-items: center; justify-content: center;
  background: var(--cell);
  font-weight: 700;
  font-size: clamp(0.6rem, calc(52vw / var(--cols)), 1.4rem);
  cursor: pointer;
  transition: transform 0.08s;
}
.ws-cell.sel { background: var(--sel); }
.ws-cell.anchor { background: var(--sel); outline: 2px dashed var(--ink); outline-offset: -2px; }
.ws-cell.focus { outline: 2px solid var(--accent); outline-offset: -2px; }
.ws-cell.bad { background: var(--bad); animation: shake 0.3s; }
.ws-cell.hinted { animation: pulse 0.5s 3; background: var(--hint); }
.ws-cell.sol { background: #e8d5ff; }
html.dark .ws-cell.sol { background: #4a3d66; }

.ws-cell.found.h-colors { background: var(--hcol, #a0e7a0); }
.ws-cell.found.h-single { background: var(--found-single); }
.ws-cell.found.h-subtle { background: var(--cell); color: var(--accent); text-decoration: underline; text-underline-offset: 3px; }
.ws-cell.secret { background: var(--secret); color: #fff; animation: pulse 0.4s; }
.ws-cell.secret.found { box-shadow: inset 0 0 0 3px var(--secret); }

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-3px); }
  75% { transform: translateX(3px); }
}
@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.12); }
}

/* ---------- word chips ---------- */
.ws-words {
  display: flex; flex-wrap: wrap; gap: 0.4rem;
  margin: 0.9rem 0; justify-content: center;
}
.chip {
  background: var(--panel); border: 1px solid var(--cell-border);
  border-radius: 999px; padding: 0.3rem 0.8rem;
  font-weight: 600; font-size: 0.9rem;
}
.chip.done { opacity: 0.45; text-decoration: line-through; }
.chip.sortable { cursor: pointer; font: inherit; }
.chip.picked { outline: 3px solid var(--accent); }
.sort-words { display: flex; flex-wrap: wrap; gap: 0.5rem; margin: 0.7rem 0; }

/* ---------- message panel ---------- */
.msg-panel {
  margin-top: 1rem; padding: 1rem;
  background: var(--panel); border: 2px solid var(--accent);
  border-radius: var(--radius); text-align: center;
}
.win { font-size: 1.15rem; font-weight: 700; margin-bottom: 0.5rem; }
.secret-text { font-size: 1.1rem; font-weight: 700; color: var(--accent); margin-top: 0.7rem; }
.secret-text.ok { color: var(--accent); }

/* ---------- codeword ---------- */
.cw-grid {
  display: grid;
  grid-template-columns: repeat(var(--cols), 1fr);
  gap: 2px;
  background: var(--cell-border);
  border: 2px solid var(--cell-border);
  border-radius: 4px; overflow: hidden;
  user-select: none; -webkit-user-select: none;
  max-width: min(100%, 80vh);
  margin: 0 auto;
}
.cw-cell {
  aspect-ratio: 1; position: relative;
  background: var(--cell);
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  font-size: clamp(0.55rem, calc(50vw / var(--cols)), 1.3rem);
}
.cw-cell.black { background: #111; }
.cw-cell .cw-num {
  position: absolute; top: 1px; left: 3px;
  font-size: 0.55em; font-weight: 500; color: var(--muted);
}
.cw-cell .cw-letter { font-weight: 700; }
.cw-cell.hint .cw-letter { color: #2a6fc2; }
.cw-cell.same { background: var(--sel); }
.cw-cell.selected { outline: 3px solid var(--accent); outline-offset: -3px; }
.cw-cell.wrong .cw-letter { color: var(--danger); }
.cw-cell.right .cw-letter { color: var(--accent); }

.cw-kb { margin: 0.8rem auto; max-width: 560px; }
.cw-kb-row { display: flex; gap: 4px; justify-content: center; margin-bottom: 4px; }
.cw-kb-row button {
  flex: 1; max-width: 48px; padding: 0.65rem 0;
  font: inherit; font-weight: 700; font-size: 1rem;
  border: 1px solid var(--cell-border); border-radius: 4px;
  background: var(--panel); color: var(--ink); cursor: pointer;
}
.cw-kb-row button:disabled { opacity: 0.3; }
.cw-words { margin-top: 0.5rem; }
.cw-words summary { cursor: pointer; font-weight: 700; color: var(--muted); }

@media (min-width: 700px) and (orientation: landscape) {
  .ws-grid { max-width: 62vh; }
  .cw-grid { max-width: 55vh; }
}