/* ==========================================================================
   QA Playground — Editorial Light theme
   Warm paper background · one confident accent · serif display + clean sans
   · custom line icons · generous whitespace. No framework.
   ========================================================================== */
:root {
  /* paper & ink */
  --bg: #f7f2e9;          /* warm cream */
  --bg-soft: #efe7d8;     /* inset / muted surfaces */
  --surface: #fffdf8;     /* cards */
  --surface-2: #fbf6ed;
  --ink: #211d18;         /* near-black, warm */
  --ink-soft: #4b443b;
  --muted: #8c8273;       /* warm gray */
  --line: #e7ddca;        /* hairline */
  --line-strong: #dccdb1;

  /* one bold accent + semantic colors */
  --accent: #d8492c;      /* vermillion */
  --accent-ink: #ad3318;  /* darker accent for text */
  --accent-soft: #fbe6dd; /* accent tint */
  --good: #2f7d57;
  --good-soft: #e6f1ea;
  --bad: #b5392a;
  --bad-soft: #fae8e4;
  --warn: #b07d23;
  --gold: #a9802f;

  --shadow: 0 1px 2px rgba(33,29,24,.05), 0 14px 34px -18px rgba(33,29,24,.22);
  --shadow-sm: 0 1px 2px rgba(33,29,24,.06);
  --radius: 16px;
  --r-sm: 11px;
  --g2048-empty: #e3d6bd;   /* empty 2048 slot (light theme) */

  --font-serif: "Iowan Old Style", "Palatino Linotype", Palatino, Charter, Georgia, "Times New Roman", serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Helvetica Neue", "Segoe UI", Roboto, system-ui, sans-serif;
  --font-mono: "SF Mono", "JetBrains Mono", Menlo, Consolas, "Liberation Mono", monospace;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--ink);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* ---- Layout ------------------------------------------------------------ */
.app { max-width: 1140px; margin: 0 auto; padding: 22px clamp(16px, 4vw, 36px) 70px; }

header.topbar {
  display: flex; align-items: center; gap: 16px;
  padding: 8px 0 30px; flex-wrap: wrap;
  border-bottom: 1px solid var(--line);
  margin-bottom: 28px;
}
.brand { display: flex; align-items: center; gap: 14px; cursor: pointer; user-select: none; }
.brand .logo {
  width: 46px; height: 46px; border-radius: 12px;
  background: var(--ink); color: var(--accent);
  display: grid; place-items: center; flex: none;
  box-shadow: var(--shadow-sm);
}
.brand .logo svg { width: 26px; height: 26px; display: block; }
.brand h1 {
  font-family: var(--font-serif); font-weight: 600;
  font-size: 25px; margin: 0; letter-spacing: -.2px; line-height: 1.05;
}
.brand small { color: var(--muted); font-size: 12.5px; display: block; margin-top: 3px; letter-spacing: .2px; }
.spacer { flex: 1; }

.search {
  display: flex; align-items: center; gap: 9px;
  background: var(--surface); border: 1px solid var(--line-strong);
  padding: 9px 15px; border-radius: 999px; min-width: 210px;
  transition: border-color .15s, box-shadow .15s;
}
.search:focus-within { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.search svg { width: 16px; height: 16px; color: var(--muted); flex: none; }
.search input { background: transparent; border: 0; outline: 0; color: var(--ink); font-size: 14px; width: 100%; font-family: inherit; }
.search input::placeholder { color: var(--muted); }
.stat-pill {
  font-size: 13px; color: var(--muted); white-space: nowrap;
  padding: 9px 4px;
}
.stat-pill b { color: var(--ink); font-weight: 600; }

/* ---- Category nav ------------------------------------------------------ */
.chips { display: flex; gap: 6px; flex-wrap: wrap; margin: 0 0 26px; }
.chip {
  border: 0; background: transparent; color: var(--muted);
  padding: 8px 15px; border-radius: 999px; cursor: pointer;
  font-size: 13.5px; font-weight: 500; font-family: inherit;
  transition: .15s; letter-spacing: .1px;
}
.chip:hover { color: var(--ink); background: var(--bg-soft); }
.chip.active { background: var(--ink); color: var(--surface); }

/* ---- Game grid --------------------------------------------------------- */
.grid {
  display: grid; gap: 18px;
  grid-template-columns: repeat(auto-fill, minmax(248px, 1fr));
}
.game-card {
  position: relative; background: var(--surface);
  border: 1px solid var(--line); border-radius: var(--radius);
  padding: 22px; cursor: pointer; overflow: hidden;
  transition: transform .16s ease, border-color .16s, box-shadow .16s;
  min-height: 168px; display: flex; flex-direction: column;
  box-shadow: var(--shadow-sm);
}
.game-card:hover { transform: translateY(-3px); border-color: var(--line-strong); box-shadow: var(--shadow); }
.game-card .icon {
  width: 46px; height: 46px; border-radius: 12px; flex: none;
  background: var(--accent-soft); color: var(--accent);
  display: grid; place-items: center; margin-bottom: 16px;
  transition: background .16s, color .16s;
}
.game-card .icon svg { width: 24px; height: 24px; display: block; }
.game-card:hover .icon { background: var(--accent); color: #fff; }
.game-card h3 { font-family: var(--font-serif); font-weight: 600; margin: 0 0 7px; font-size: 18.5px; letter-spacing: -.2px; }
.game-card p { margin: 0; color: var(--ink-soft); font-size: 13.5px; line-height: 1.5; flex: 1; }
.game-card .tag {
  position: absolute; top: 18px; right: 18px; font-size: 10px; text-transform: uppercase;
  letter-spacing: .8px; color: var(--muted); font-weight: 600;
}
.game-card .best { margin-top: 14px; font-size: 12.5px; color: var(--ink-soft); display: flex; align-items: center; gap: 6px; }
.game-card .best svg { width: 13px; height: 13px; color: var(--gold); }
.game-card .best.empty { color: var(--muted); }
.game-card .best.empty svg { display: none; }

/* ---- Game view --------------------------------------------------------- */
.gameview { animation: fade .25s ease; }
@keyframes fade { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }

.gv-head { display: flex; align-items: flex-start; gap: 14px; margin-bottom: 22px; flex-wrap: wrap; }
.btn {
  border: 1px solid var(--line-strong); background: var(--surface); color: var(--ink);
  padding: 10px 17px; border-radius: var(--r-sm); cursor: pointer; font-size: 14px;
  transition: .15s; font-weight: 500; font-family: inherit;
}
.btn:hover { border-color: var(--ink); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.primary:hover { background: var(--accent-ink); border-color: var(--accent-ink); }
.btn.ghost { background: transparent; border-color: transparent; color: var(--ink-soft); padding-left: 8px; padding-right: 12px; }
.btn.ghost:hover { color: var(--ink); background: var(--bg-soft); }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.gv-title { font-family: var(--font-serif); font-weight: 600; font-size: 23px; margin: 0; letter-spacing: -.3px; display: flex; align-items: center; gap: 11px; }
.gv-ic { width: 38px; height: 38px; border-radius: 10px; background: var(--accent-soft); color: var(--accent); display: grid; place-items: center; flex: none; }
.gv-ic svg { width: 21px; height: 21px; display: block; }
.gv-sub { color: var(--muted); font-size: 13.5px; margin: 5px 0 0; max-width: 60ch; }

.panel {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); padding: clamp(20px, 3.5vw, 34px); box-shadow: var(--shadow-sm);
}
.center { text-align: center; }
.row { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.between { justify-content: space-between; }
.muted { color: var(--muted); }
.big { font-family: var(--font-serif); font-size: clamp(28px, 5vw, 44px); font-weight: 600; letter-spacing: -.5px; }
.hidden { display: none !important; }
h2, h3 { font-family: var(--font-serif); font-weight: 600; letter-spacing: -.2px; }
.panel h3 { font-size: 20px; line-height: 1.35; }

/* score bar */
.scorebar { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 18px; }
.scorebar .box {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-sm);
  padding: 11px 18px; min-width: 92px; text-align: center;
}
.scorebar .box span { display: block; font-size: 10.5px; color: var(--muted); text-transform: uppercase; letter-spacing: .7px; font-weight: 600; margin-bottom: 2px; }
.scorebar .box b { font-size: 23px; font-family: var(--font-serif); font-weight: 600; }

/* option buttons */
.options { display: grid; gap: 11px; margin-top: 20px; }
.opt {
  text-align: left; padding: 15px 18px; border-radius: var(--r-sm);
  border: 1px solid var(--line-strong); background: var(--surface); color: var(--ink);
  cursor: pointer; font-size: 15px; transition: .12s; font-family: inherit; line-height: 1.4;
}
.opt:hover:not(:disabled) { border-color: var(--ink); background: var(--surface-2); }
.opt.correct { border-color: var(--good); background: var(--good-soft); color: #1d5a3d; }
.opt.wrong { border-color: var(--bad); background: var(--bad-soft); color: #8c2a1e; }
.opt:disabled { cursor: default; }

.feedback { margin-top: 18px; padding: 13px 16px; border-radius: var(--r-sm); font-size: 14px; line-height: 1.5; }
.feedback.ok { background: var(--good-soft); border: 1px solid var(--good); color: #1d5a3d; }
.feedback.no { background: var(--bad-soft); border: 1px solid var(--bad); color: #8c2a1e; }

.progress { height: 6px; background: var(--bg-soft); border-radius: 999px; overflow: hidden; margin-bottom: 20px; }
.progress > i { display: block; height: 100%; background: var(--accent); transition: width .3s; border-radius: 999px; }

.timer { font-variant-numeric: tabular-nums; }

/* code block — single dark "ink" element on the light page (intentional) */
pre.code {
  background: #241f19; border: 0; border-radius: var(--r-sm);
  padding: 18px; overflow-x: auto; font-family: var(--font-mono);
  font-size: 13.5px; line-height: 1.65; margin: 16px 0; color: #f1e9da;
}
pre.code .ln { display: block; padding: 2px 8px; border-radius: 5px; cursor: pointer; }
pre.code .ln:hover { background: #322b22; }
pre.code .ln .num { color: #7c715f; user-select: none; display: inline-block; width: 26px; }

/* memory cards */
.mem-grid { display: grid; gap: 10px; margin-top: 18px; }
.mem-card {
  aspect-ratio: 1; border-radius: var(--r-sm); border: 1px solid var(--ink);
  background: var(--ink); color: var(--surface);
  display: grid; place-items: center; cursor: pointer; font-size: clamp(11px, 2.2vw, 15px);
  padding: 8px; text-align: center; transition: .15s; font-weight: 600;
}
.mem-card.flipped { background: var(--surface); color: var(--ink); border-color: var(--accent); }
.mem-card.matched { background: var(--good-soft); border-color: var(--good); color: #1d5a3d; cursor: default; }

/* letter tiles */
.tiles { display: flex; gap: 8px; flex-wrap: wrap; justify-content: center; margin: 16px 0; }
.tile {
  width: 48px; height: 54px; border-radius: 9px; border: 2px solid var(--line-strong);
  display: grid; place-items: center; font-size: 24px; font-weight: 700; background: var(--surface);
  text-transform: uppercase; font-family: var(--font-mono); color: var(--ink);
}
.tile.green { background: var(--good); border-color: var(--good); color: #fff; }
.tile.amber { background: var(--warn); border-color: var(--warn); color: #fff; }
.tile.gray  { background: var(--bg-soft); border-color: var(--line-strong); color: var(--muted); }
.tile.filled { border-color: var(--ink); }

/* on-screen keyboard */
.kbd { display: flex; flex-direction: column; gap: 7px; margin-top: 16px; align-items: center; }
.kbd-row { display: flex; gap: 6px; }
.key {
  min-width: 32px; height: 48px; padding: 0 9px; border-radius: 8px; border: 1px solid var(--line-strong);
  background: var(--surface); color: var(--ink); font-weight: 600; cursor: pointer; font-size: 14px; font-family: inherit;
  transition: .12s;
}
.key.wide { min-width: 60px; font-size: 11.5px; }
.key:hover { border-color: var(--ink); }
.key.green { background: var(--good); color: #fff; border-color: var(--good); }
.key.amber { background: var(--warn); color: #fff; border-color: var(--warn); }
.key.gray { background: var(--bg-soft); color: var(--muted); border-color: var(--line); }

/* sortable */
.sortable { display: flex; flex-direction: column; gap: 10px; margin-top: 18px; }
.sort-item {
  background: var(--surface); border: 1px solid var(--line-strong); border-radius: var(--r-sm);
  padding: 14px 16px; cursor: grab; display: flex; align-items: center; gap: 12px;
  font-size: 15px; transition: .12s;
}
.sort-item:hover { border-color: var(--ink); }
.sort-item.dragging { opacity: .4; }
.sort-item .handle { color: var(--muted); font-size: 18px; cursor: grab; }
.sort-item .order-num { color: var(--accent); font-weight: 700; min-width: 22px; font-family: var(--font-serif); }

/* two-column match */
.match-cols { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 18px; }
.match-col { display: flex; flex-direction: column; gap: 10px; }
.match-item {
  background: var(--surface); border: 1px solid var(--line-strong); border-radius: var(--r-sm);
  padding: 12px 14px; cursor: pointer; font-size: 14px; transition: .12s; line-height: 1.4;
}
.match-item:hover { border-color: var(--ink); }
.match-item.selected { border-color: var(--accent); background: var(--accent-soft); }
.match-item.done { opacity: .45; border-color: var(--good); cursor: default; }
.match-item.wrong { border-color: var(--bad); }

/* quadrant */
.quad-buttons { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 18px; }
.quad-buttons .opt { text-align: center; }

/* arena / moles */
.arena {
  position: relative; height: 360px; background: var(--bg-soft);
  border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; margin-top: 18px;
  user-select: none;
}
.mole {
  position: absolute; width: 64px; height: 64px; border-radius: 50%;
  display: grid; place-items: center; font-size: 30px; cursor: pointer;
  background: var(--accent); color: #fff; box-shadow: var(--shadow); transition: transform .08s;
}
.mole:active { transform: scale(.85); }
.mole.good { background: var(--good); }

/* typing */
.typing-target {
  background: var(--surface-2); border: 1px solid var(--line); border-radius: var(--r-sm);
  padding: 18px; font-size: 18px; line-height: 1.8; margin: 16px 0; font-family: var(--font-mono); color: var(--ink-soft);
}
.typing-target .ok { color: var(--good); }
.typing-target .err { color: var(--bad); background: var(--bad-soft); border-radius: 2px; }
.typing-target .cur { background: var(--accent); color: #fff; border-radius: 2px; }
textarea.type-input, input.text-input {
  width: 100%; background: var(--surface); border: 1px solid var(--line-strong);
  border-radius: var(--r-sm); color: var(--ink); padding: 13px 15px; font-size: 16px;
  font-family: inherit; outline: none; transition: border-color .15s, box-shadow .15s;
}
textarea.type-input { min-height: 92px; resize: vertical; }
textarea.type-input:focus, input.text-input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }

/* emoji/symbol grids (odd-one-out, word search) */
.emoji-grid { display: grid; gap: 6px; margin-top: 16px; }
.emoji-cell {
  aspect-ratio: 1; display: grid; place-items: center; font-size: clamp(16px, 3.5vw, 26px);
  background: var(--surface); border: 1px solid var(--line); border-radius: 8px; cursor: pointer;
  transition: .1s; color: var(--ink);
}
.emoji-cell:hover { border-color: var(--accent); }
.emoji-cell.found { background: var(--good-soft); border-color: var(--good); color: var(--good); }

/* result screen */
.result-badge {
  width: 64px; height: 64px; border-radius: 50%; margin: 0 auto 14px;
  background: var(--accent-soft); color: var(--accent); display: grid; place-items: center;
}
.result-badge svg { width: 32px; height: 32px; }
.result-emoji { font-size: 56px; margin-bottom: 8px; }

.toast {
  position: fixed; bottom: 26px; left: 50%; transform: translateX(-50%);
  background: var(--ink); border: 0; color: var(--surface);
  padding: 12px 22px; border-radius: 999px; box-shadow: var(--shadow); z-index: 50;
  animation: fade .2s ease; font-size: 14px; font-weight: 500;
}

footer.foot { margin-top: 56px; padding-top: 24px; border-top: 1px solid var(--line); text-align: center; color: var(--muted); font-size: 13px; }
footer.foot a { color: var(--accent); text-decoration: none; }

/* 2048 */
.g2048 {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px;
  background: var(--bg-soft); padding: 10px; border-radius: var(--radius); border: 1px solid var(--line);
  max-width: 360px; margin: 18px auto; aspect-ratio: 1;
}
.g2048 .cell {
  border-radius: 9px; display: grid; place-items: center; font-weight: 700;
  font-size: clamp(11px, 2.8vw, 16px); text-align: center; padding: 4px; font-family: var(--font-mono);
  background: var(--g2048-empty); color: var(--ink);
}

@media (max-width: 560px) {
  .match-cols { grid-template-columns: 1fr; }
  .search { min-width: 130px; }
  .tile { width: 42px; height: 48px; font-size: 20px; }
  header.topbar { gap: 10px; }
}

/* ---- Theme toggle (segmented control) ---------------------------------- */
.theme-toggle {
  display: inline-flex; gap: 2px; padding: 3px;
  background: var(--bg-soft); border: 1px solid var(--line); border-radius: 999px;
}
.theme-toggle button {
  border: 0; background: transparent; color: var(--muted); cursor: pointer;
  font-family: inherit; font-size: 12.5px; font-weight: 600; padding: 6px 13px;
  border-radius: 999px; transition: .15s; letter-spacing: .2px;
}
.theme-toggle button:hover { color: var(--ink); }
.theme-toggle button.active { background: var(--accent); color: #fff; }

/* ==========================================================================
   TERMINAL MODE (v2) — muted dark base · monospace · syntax-accent palette
   Most components are re-themed purely by overriding the CSS variables.
   ========================================================================== */
[data-theme="terminal"] {
  --bg: #0d1117;
  --bg-soft: #161b22;
  --surface: #11161d;
  --surface-2: #1b222c;
  --ink: #d7dde5;
  --ink-soft: #9aa4b2;
  --muted: #6e7886;
  --line: #222b36;
  --line-strong: #313c49;
  --accent: #58a6ff;       /* keyword blue */
  --accent-ink: #79c0ff;
  --accent-soft: rgba(88,166,255,.15);
  --good: #3fb950;         /* string green */
  --good-soft: rgba(63,185,80,.16);
  --bad: #f85149;
  --bad-soft: rgba(248,81,73,.16);
  --warn: #d29922;         /* number amber */
  --gold: #e3b341;
  --shadow: 0 0 0 1px rgba(0,0,0,.25), 0 18px 44px -26px rgba(0,0,0,.85);
  --shadow-sm: 0 1px 0 rgba(0,0,0,.35);
  --radius: 8px;
  --r-sm: 6px;
  --g2048-empty: #1c232e;   /* empty 2048 slot (terminal theme) */
  --font-serif: var(--font-mono);
  --font-sans: var(--font-mono);
}
[data-theme="terminal"] body { background: var(--bg); }

/* components that assumed --ink was a dark color need a dark surface instead */
[data-theme="terminal"] .brand .logo { background: var(--surface-2); color: var(--accent); border: 1px solid var(--line-strong); }
[data-theme="terminal"] .chip.active { background: var(--accent); color: #0d1117; }
[data-theme="terminal"] .mem-card { background: var(--surface-2); color: var(--accent); border-color: var(--line-strong); }
[data-theme="terminal"] .toast { background: var(--surface-2); color: var(--ink); border: 1px solid var(--accent); }
[data-theme="terminal"] pre.code { background: #080b10; color: #c9d1d9; border: 1px solid var(--line); }
[data-theme="terminal"] pre.code .ln:hover { background: #1b222c; }
[data-theme="terminal"] pre.code .ln .num { color: #56606e; }

/* monospace headings read better with a touch less weight & tighter look */
[data-theme="terminal"] .brand h1,
[data-theme="terminal"] .gv-title,
[data-theme="terminal"] .big,
[data-theme="terminal"] h2,
[data-theme="terminal"] h3 { letter-spacing: -.3px; }

/* terminal flavour: prompts & hashes */
[data-theme="terminal"] .game-card h3::before { content: "> "; color: var(--accent); }
[data-theme="terminal"] .game-card .tag { text-transform: lowercase; }
[data-theme="terminal"] .game-card .tag::before { content: "#"; }
[data-theme="terminal"] .brand small::before { content: "~ "; color: var(--accent); }