/* Excel Games — pure CSS theme (green) */
:root {
  --bg: #f3faf4;
  --bg-grad-1: #d9f2dd;
  --bg-grad-2: #c7ead0;
  --surface: #ffffff;
  --surface-2: #f0f8f2;
  --border: #d8e8dc;
  --border-strong: #b9d7bf;
  --text: #0f2417;
  --text-muted: #5b6f60;
  --primary: #1f8a4c;
  --swift: #4154f1;
  --primary-600: #176d3c;
  --primary-700: #115730;
  --primary-50: #e7f5ec;
  --on-primary: #ffffff;
  --correct: #2fa860;
  --present: #d4a017;
  --absent: #6b7770;
  --danger: #c0392b;
  --shadow-sm: 0 1px 2px rgba(15, 36, 23, 0.05);
  --shadow-md: 0 10px 30px -12px rgba(15, 36, 23, 0.18);
  --shadow-lg: 0 30px 60px -20px rgba(15, 36, 23, 0.25);
  --radius: 14px;
  --radius-sm: 10px;
  --radius-lg: 22px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1612;
    --bg-grad-1: #11261b;
    --bg-grad-2: #0a1c14;
    --surface: #142019;
    --surface-2: #182a20;
    --border: #1f3328;
    --border-strong: #2c4a39;
    --text: #e9f3ec;
    --text-muted: #94a89b;
    --primary: #34c97a;
    --primary-600: #2bb56b;
    --primary-700: #229158;
    --primary-50: #14281e;
    --on-primary: #07150d;
    --absent: #3a4a41;
  }
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: "Inter", "Segoe UI", system-ui, -apple-system, sans-serif;
  color: var(--text);
  background:
    var(--bg);
  -webkit-font-smoothing: antialiased;
  line-height: 1.5;
}
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; }
h1, h2, h3 { letter-spacing: -0.02em; margin: 0; }
.mono { font-family: "JetBrains Mono", "SF Mono", Menlo, monospace; }

.container { max-width: 1080px; margin: 0 auto; padding: 0 20px; }
.container-narrow { max-width: 760px; margin: 0 auto; padding: 0 20px; }

/* ---------- Top bar ---------- */
.topbar {
  position: sticky; top: 0; z-index: 10;
  -webkit-backdrop-filter: saturate(140%) blur(10px);
  backdrop-filter: saturate(140%) blur(10px);
  background: color-mix(in oklab, var(--bg) 75%, transparent);
  border-bottom: 1px solid var(--border);
}
.topbar-inner {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 0;
}
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 700; letter-spacing: -0.01em; }
.brand-mark {
  width: 32px; height: 32px; border-radius: 9px;
  background: var(--primary); color: var(--on-primary);
  display: grid; place-items: center; font-weight: 800; box-shadow: var(--shadow-sm);
}
.brand-name span { color: var(--primary); }

.brand-name-swift span { color: var(--swift); }

.brand-logo {
  height: 40px;
  width: auto;
  display: block;
}

.back-link {
  display: inline-flex; align-items: center; gap: 8px;
  color: var(--text-muted); font-size: 14px; font-weight: 500;
}
.back-link:hover { color: var(--text); }
.back-mark {
  width: 28px; height: 28px; border-radius: 8px;
  background: var(--primary-50); color: var(--primary);
  display: grid; place-items: center;
}

/* ---------- Hero ---------- */
.hero { text-align: center; padding: 56px 0 36px; }
.pill {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 12px; border-radius: 999px;
  background: var(--surface); border: 1px solid var(--border);
  color: var(--text-muted); font-size: 12px; font-weight: 500;
}
.pill .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--primary); animation: pulse 1.6s ease-in-out infinite; }
@keyframes pulse { 50% { opacity: 0.4; } }
.hero h1 {
  font-size: clamp(34px, 5vw, 60px); font-weight: 800;
  margin-top: 18px; line-height: 1.05;
}
.hero h1 .accent { color: var(--primary); }
.hero p { color: var(--text-muted); max-width: 560px; margin: 14px auto 0; font-size: 17px; }

/* ---------- Cards grid ---------- */
.grid { display: grid; gap: 18px; padding: 16px 0 80px; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); }
.card {
  position: relative; overflow: hidden;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 22px; box-shadow: var(--shadow-sm);
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
  display: block;
}
.card::before {
  content: "";
  position: absolute;
  inset: 0;

  background: var(--accent);

  opacity: 0;
  transition: opacity .2s ease;
  pointer-events: none;
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); border-color: var(--border-strong); }
.card:hover::before { opacity: 1; }
.card > * { position: relative; }
.card-icon { font-size: 32px; }
.card h3 { margin-top: 14px; font-size: 19px; font-weight: 700; }
.card p { margin: 6px 0 0; color: var(--text-muted); font-size: 14px; }
.card-cta { margin-top: 18px; color: var(--primary); font-weight: 600; font-size: 14px; display: inline-flex; align-items: center; gap: 6px; }
.card:hover .card-cta .arrow { transform: translateX(3px); }
.card-cta .arrow { transition: transform .2s ease; }
.card.placeholder { border-style: dashed; background: transparent; display: grid; place-items: center; text-align: center; color: var(--text-muted); min-height: 160px; }

/* ---------- Daily badge ---------- */
.card-badge {
  position: absolute; top: 12px; right: 12px; z-index: 2;
  background: var(--primary); color: var(--on-primary);
  border-radius: 999px; padding: 3px 10px; font-size: 11px; font-weight: 700;
  letter-spacing: .04em; text-transform: uppercase;
  box-shadow: 0 4px 12px -4px color-mix(in oklab, var(--primary) 60%, transparent);
}

/* ---------- Share button ---------- */
.share-btn { margin-top: 14px; }
.share-row { display: flex; justify-content: center; margin-top: 10px; }

/* ---------- Daily-done banner ---------- */
.daily-done {
  background: var(--primary-50); border: 1px solid var(--border-strong);
  border-radius: var(--radius); padding: 18px; text-align: center; color: var(--text);
}
.daily-done h3 { margin: 0 0 4px; color: var(--primary); font-size: 18px; }
.daily-done p { margin: 4px 0; color: var(--text-muted); font-size: 14px; }


/* ---------- Game shell ---------- */
.game-header { margin: 10px 0 10px; }
.game-tag {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--primary-50); color: var(--primary);
  border-radius: 999px; padding: 4px 12px; font-size: 12px; font-weight: 600;
}
.game-header h1 { font-size: clamp(26px, 4vw, 38px); font-weight: 800; margin-top: 12px; }
.game-header p { color: var(--text-muted); margin-top: 6px; }

.panel {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg); box-shadow: var(--shadow-sm);
  padding: 28px; margin-bottom: 20px;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  border-radius: var(--radius-sm); padding: 11px 20px;
  font-size: 14px; font-weight: 600;
  border: 1px solid transparent; background: var(--primary); color: var(--on-primary);
  transition: filter .15s ease, transform .05s ease;
}
.btn:hover { filter: brightness(1.06); }
.btn:active { transform: translateY(1px); }
.btn[disabled] { opacity: .4; cursor: not-allowed; }
.btn-ghost { background: transparent; color: var(--text-muted); }
.btn-ghost:hover { color: var(--text); }
.btn-outline { background: transparent; color: var(--text); border-color: var(--border-strong); }

/* ---------- Quiz ---------- */
.q-meta { display: flex; justify-content: space-between; font-size: 14px; color: var(--text-muted); margin-bottom: 10px; }
.q-meta strong { color: var(--primary); }
.progress { height: 6px; background: var(--surface-2); border-radius: 999px; overflow: hidden; margin-bottom: 22px; }
.progress > div { height: 100%; background: var(--primary); transition: width .25s ease; }
.prompt {
  background: var(--surface-2); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 22px; margin-bottom: 18px;
  word-break: break-word;
}
.prompt.shortcut { text-align: center; font-family: "JetBrains Mono", monospace; font-size: clamp(22px, 4vw, 32px); font-weight: 700; color: var(--primary); letter-spacing: .02em; }
.prompt.formula { font-family: "JetBrains Mono", monospace; font-size: 15px; }
.options { display: grid; gap: 10px; }
.opt {
  text-align: left; background: var(--surface); color: var(--text);
  border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 14px 16px; transition: border-color .15s, background .15s, transform .05s;
}
.opt:hover:not([disabled]) { border-color: var(--primary); background: color-mix(in oklab, var(--primary) 6%, var(--surface)); }
.opt.correct { border-color: var(--correct); background: color-mix(in oklab, var(--correct) 14%, var(--surface)); }
.opt.wrong { border-color: var(--danger); background: color-mix(in oklab, var(--danger) 10%, var(--surface)); }
.q-foot { display: flex; justify-content: space-between; margin-top: 22px; }
.final { text-align: center; padding: 30px 0; }
.final .emoji { font-size: 56px; }
.final h2 { margin-top: 14px; font-size: 26px; }
.final p { color: var(--text-muted); margin-top: 4px; }

/* ---------- Wordle ---------- */
.wordle { display: flex; flex-direction: column; align-items: center; gap: 10px; }
.wordle-row { display: grid; grid-template-columns: repeat(5, 1fr); gap: 8px; }
.tile {
  width: 58px; height: 58px; border: 2px solid var(--border-strong);
  background: var(--surface);
  border-radius: 8px; display: grid; place-items: center;
  font-size: 26px; font-weight: 800; text-transform: uppercase;
  transition: transform .15s ease, background .2s ease, border-color .2s ease, color .2s ease;
}
.tile.filled { border-color: var(--text-muted); }
.tile.correct { background: var(--correct); color: #fff; border-color: var(--correct); }
.tile.present { background: var(--present); color: #fff; border-color: var(--present); }
.tile.absent  { background: var(--absent);  color: #fff; border-color: var(--absent); }
.wordle-msg { min-height: 22px; margin-top: 10px; text-align: center; font-size: 14px; }
.wordle-msg.err { color: var(--danger); }
.wordle-msg.win { color: var(--primary); font-weight: 700; }
.wordle-msg.lose { color: var(--danger); font-weight: 700; }
.wordle-actions { margin-top: 16px; display: flex; justify-content: center; gap: 10px; }

/* ---------- A-Z ---------- */
.az-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 14px; }
.az-grid { display: grid; gap: 8px; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }
.az-row {
  display: flex; align-items: center; gap: 12px;
  border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 8px 10px; background: var(--surface);
}
.az-row.ok { border-color: var(--correct); background: color-mix(in oklab, var(--correct) 8%, var(--surface)); }
.az-row.bad { border-color: var(--danger); background: color-mix(in oklab, var(--danger) 6%, var(--surface)); }
.az-letter {
  width: 32px; height: 32px; border-radius: 8px;
  background: var(--primary-50); color: var(--primary);
  display: grid; place-items: center; font-weight: 800;
}
.az-row input {
  flex: 1; border: 0; background: transparent; color: var(--text);
  font-size: 14px; outline: none; text-transform: uppercase;
}
.az-row input::placeholder { color: var(--text-muted); text-transform: none; }
.az-check { color: var(--correct); }

/* ---------- Hardcore ---------- */
.hc-head { display: flex; justify-content: space-between; font-size: 14px; color: var(--text-muted); margin-bottom: 8px; }
.hc-head strong { color: var(--primary); }
.hc-input {
  width: 100%; padding: 14px 16px; border: 2px solid var(--border-strong);
  background: var(--surface); color: var(--text); border-radius: var(--radius-sm);
  font-family: "JetBrains Mono", monospace; font-size: 18px; text-transform: uppercase; outline: none;
  transition: border-color .15s ease;
}
.hc-input:focus { border-color: var(--primary); }
.hc-input.ok { border-color: var(--correct); }
.hc-input.bad { border-color: var(--danger); }
.hc-input.dup { border-color: var(--present); }
.hc-msg { min-height: 18px; margin-top: 6px; font-size: 12px; color: var(--text-muted); }
.hc-msg.ok { color: var(--correct); }
.hc-msg.bad { color: var(--danger); }
.hc-msg.dup { color: var(--present); }
.hc-found { margin-top: 22px; }
.hc-found .label { font-size: 12px; text-transform: uppercase; letter-spacing: .1em; color: var(--text-muted); margin-bottom: 8px; }
.hc-chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chip {
  font-family: "JetBrains Mono", monospace; font-size: 12px;
  padding: 4px 8px; border-radius: 8px;
  background: var(--primary-50); color: var(--primary);
  border: 1px solid color-mix(in oklab, var(--primary) 25%, transparent);
}
.start-pane { text-align: center; padding: 16px 0; }
.start-pane p { color: var(--text-muted); }


/* ---------- Connections ---------- */
.conn-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin: 14px 0;
}
.conn-tile {
  aspect-ratio: 5/3; border-radius: var(--radius-sm);
  background: var(--surface-2); border: 1px solid var(--border);
  color: var(--text); font-weight: 700; font-size: 13px;
  text-transform: uppercase; letter-spacing: .02em;
  transition: transform .08s ease, background .15s ease, border-color .15s ease;
  padding: 4px;
}
.conn-tile:hover { border-color: var(--primary); }
.conn-tile.sel { background: var(--text); color: var(--bg); border-color: var(--text); transform: translateY(1px); }
.conn-solved {
  border-radius: var(--radius-sm); padding: 12px 14px; margin-bottom: 8px;
  color: #1a1a1a;
}
.conn-solved .conn-cat { font-weight: 800; font-size: 13px; text-transform: uppercase; letter-spacing: .04em; }
.conn-solved .conn-words { font-size: 13px; margin-top: 2px; opacity: .85; }
.conn-solved.lv1 { background: #fce98a; }
.conn-solved.lv2 { background: #a8d77a; }
.conn-solved.lv3 { background: #7eb5e3; }
.conn-solved.lv4 { background: #c79ee0; }
@media (max-width: 520px) { .conn-tile { font-size: 11px; } }

/* ---------- Higher or Lower ---------- */
.hl-stack { display: grid; grid-template-columns: 1fr auto 1fr; gap: 14px; align-items: stretch; }
.hl-card {
  background: var(--surface-2); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 22px; text-align: center;
  display: flex; flex-direction: column; justify-content: center; gap: 10px; min-height: 200px;
}
.hl-known .hl-value { color: var(--primary); }
.hl-label { font-size: 14px; color: var(--text-muted); }
.hl-value { font-size: clamp(28px, 6vw, 44px); font-weight: 800; letter-spacing: -0.02em; }
.hl-vs { align-self: center; color: var(--text-muted); font-weight: 700; font-size: 13px; text-transform: uppercase; }
.hl-actions { display: flex; gap: 8px; justify-content: center; margin-top: 6px; }
@media (max-width: 600px) {
  .hl-stack { grid-template-columns: 1fr; }
  .hl-vs { transform: none; }
}

/* ---------- Rankings ---------- */
.rank-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.rank-item {
  display: flex; align-items: center; gap: 12px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 12px 14px;
  -webkit-user-select: none;
  cursor: grab; user-select: none;
}
.rank-item.drag { opacity: .5; }
.rank-item.over { border-color: var(--primary); background: color-mix(in oklab, var(--primary) 6%, var(--surface)); }
.rank-item.ok { border-color: var(--correct); background: color-mix(in oklab, var(--correct) 10%, var(--surface)); }
.rank-item.bad { border-color: var(--danger); background: color-mix(in oklab, var(--danger) 8%, var(--surface)); }
.rank-handle { color: var(--text-muted); font-weight: 800; cursor: grab; }
.rank-num {
  width: 26px; height: 26px; border-radius: 8px;
  background: var(--primary-50); color: var(--primary);
  display: grid; place-items: center; font-weight: 800; font-size: 13px;
}
.rank-label { flex: 1; font-weight: 600; }
.rank-val { color: var(--text-muted); font-size: 12px; font-family: "JetBrains Mono", monospace; }

/* ---------- Bingo ---------- */
.bingo { display: grid; grid-template-columns: repeat(5, 1fr); gap: 6px; margin: 14px 0; }
.bingo-cell {
  aspect-ratio: 1/1; border-radius: 10px; padding: 6px;
  background: var(--surface-2); border: 1px solid var(--border);
  color: var(--text); font-size: 15px; font-weight: 600; line-height: 1.2;
  display: grid; place-items: center; text-align: center;
  transition: background .15s, border-color .15s, color .15s, transform .05s;
}
.bingo-cell:hover { border-color: var(--primary); }
.bingo-cell.on {
  background: var(--primary); color: var(--on-primary); border-color: var(--primary);
  text-decoration: line-through; text-decoration-thickness: 2px;
}
.bingo-cell.free { background: var(--present); color: #fff; border-color: var(--present); font-weight: 800; }
.bingo-cell.free.on { background: var(--present); }
@media (max-width: 520px) { .bingo-cell { font-size: 9px; padding: 3px; } }

/* ---------- Word Search ---------- */
.ws-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 12px; font-size: 14px; color: var(--text-muted); }
.ws-grid {
  display: grid; gap: 4px; margin: 4px 0 16px;
  -webkit-user-select: none;
  user-select: none; touch-action: none;
}
.ws-cell {
  aspect-ratio: 1/1; border-radius: 6px;
  background: var(--surface-2); border: 1px solid var(--border);
  display: grid; place-items: center;
  font-family: "JetBrains Mono", monospace; font-weight: 700;
  font-size: clamp(12px, 2.4vw, 18px);
  color: var(--text); cursor: pointer;
  transition: background .1s, color .1s, border-color .1s;
}
.ws-cell.sel { background: var(--primary); color: var(--on-primary); border-color: var(--primary); }
.ws-cell.found { background: color-mix(in oklab, var(--correct) 25%, var(--surface)); border-color: var(--correct); color: var(--text); }
.ws-cell.found.sel { background: var(--primary); color: var(--on-primary); }
.ws-words { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }
.ws-word {
  font-family: "JetBrains Mono", monospace; font-size: 13px; font-weight: 600;
  padding: 6px 10px; border-radius: 8px;
  background: var(--surface-2); border: 1px solid var(--border); color: var(--text);
}
.ws-word.done { background: color-mix(in oklab, var(--correct) 18%, var(--surface)); border-color: var(--correct); color: var(--text-muted); text-decoration: line-through; }

/* ---------- Shuffled Function Names ---------- */
.sh-list { list-style: decimal inside; padding: 0; margin: 0 0 12px; display: flex; flex-direction: column; gap: 10px; }
.sh-item { display: grid; grid-template-columns: 1fr 1.2fr auto; gap: 12px; align-items: center; padding: 10px 14px; background: var(--surface-2, #f6faf6); border: 1px solid var(--border); border-radius: 10px; }
.sh-scramble { font-size: 18px; letter-spacing: 3px; font-weight: 700; color: var(--accent, #2f7a3a); text-transform: uppercase; }
.sh-input { padding: 8px 12px; border-radius: 8px; border: 1px solid var(--border); font: inherit; }
.sh-input.ok { border-color: #2f7a3a; background: #e8f7eb; }
.sh-input.bad { border-color: #b3261e; background: #fdecea; }
.sh-result { min-width: 110px; font-weight: 600; text-align: right; }
.sh-result.ok { color: #2f7a3a; }
.sh-result.bad { color: #b3261e; }

/* ---------- Crossword ---------- */
.cw-wrap { display: grid; grid-template-columns: auto 1fr; gap: 28px; align-items: start; }
@media (max-width: 760px) { .cw-wrap { grid-template-columns: 1fr; } }
.cw-board { display: grid; gap: 0; border: 2px solid #0f3a18; background: #0f3a18; padding: 2px; border-radius: 6px; }
.cw-cell { position: relative; aspect-ratio: 1; background: #fff; display: flex; align-items: center; justify-content: center; border: 1px solid #c7d6c9; }
.cw-cell.block { background: #0f3a18; border-color: #0f3a18; }
.cw-num { position: absolute; top: 1px; left: 3px; font-size: 9px; color: #2f7a3a; font-weight: 700; pointer-events: none; }
.cw-cell input { width: 100%; height: 100%; border: 0; background: transparent; text-align: center; font-size: 18px; font-weight: 700; text-transform: uppercase; color: #0f3a18; outline: none; padding: 0; }
.cw-cell input:focus { background: #e8f7eb; }
.cw-cell input.ok { background: #c7ecd0; }
.cw-cell input.bad { background: #fdecea; }
.cw-clues { display: flex; flex-direction: column; gap: 16px; }
.cw-section h3 { margin: 0 0 6px; color: var(--accent, #2f7a3a); font-size: 14px; text-transform: uppercase; letter-spacing: 1px; }
.cw-section ol { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 6px; font-size: 14px; }
.cw-section li strong { color: var(--accent, #2f7a3a); margin-right: 4px; }

/* ---------- Sudoku ---------- */
.sd-bar { display: flex; justify-content: space-between; align-items: center; margin-bottom: 12px; gap: 12px; flex-wrap: wrap; }
.sd-toggle { display: inline-flex; align-items: center; gap: 8px; cursor: pointer; font-weight: 600; }
.sd-legend { display: flex; flex-wrap: wrap; gap: 6px; justify-content: center; margin-bottom: 14px; }
.sd-chip { background: #e8f7eb; color: #0f3a18; border: 1px solid #c7ecd0; border-radius: 999px; padding: 3px 10px; font-size: 12px; font-weight: 600; }
.sd-board { display: grid; grid-template-columns: repeat(9, 1fr); gap: 0; max-width: 540px; margin: 0 auto; border: 2px solid #0f3a18; border-radius: 6px; overflow: hidden; background: #fff; }
.sd-cell { aspect-ratio: 1; border: 1px solid #d4e2d6; display: flex; align-items: center; justify-content: center; font-weight: 700; color: #0f3a18; background: #fff; position: relative; min-width: 0; }
.sd-cell.given { background: #f0f6f1; }
.sd-cell.bl { border-left: 2px solid #0f3a18; }
.sd-cell.bt { border-top: 2px solid #0f3a18; }
.sd-cell.bad { background: #fdecea !important; }
.sd-cell select { width: 100%; height: 100%; border: 0; background: transparent; text-align: center; text-align-last: center; font: inherit; font-weight: 600; color: #2f7a3a; cursor: pointer; -webkit-appearance: none; appearance: none; padding: 0; outline: none; }
.sd-cell select:focus { background: #e8f7eb; }


/* ---------- Function Ladder ---------- */
.ladder-list { display: flex; flex-direction: column; gap: 10px; max-width: 520px; margin: 0 auto; }
.ladder-row { display: grid; grid-template-columns: 44px 1fr; gap: 12px; align-items: center; }
.ladder-letter {
  width: 44px; height: 44px; border-radius: 12px;
  background: var(--primary); color: var(--on-primary);
  display: grid; place-items: center; font-weight: 800; font-size: 18px;
}
.ladder-row.done .ladder-letter { background: var(--correct); }
.ladder-input {
  width: 100%; padding: 12px 14px; border-radius: var(--radius-sm);
  border: 2px solid var(--border-strong); background: var(--surface);
  color: var(--text); font-size: 16px; font-weight: 600; font-family: 'JetBrains Mono', monospace;
  outline: none; text-transform: uppercase;
}
.ladder-input:focus { border-color: var(--primary); }
.ladder-input.ok { border-color: var(--correct); background: var(--primary-50); }
.ladder-input.bad { border-color: var(--danger); }
.ladder-static {
  padding: 12px 14px; border-radius: var(--radius-sm);
  background: var(--surface-2); border: 1px solid var(--border);
  font-weight: 700; font-family: 'JetBrains Mono', monospace; color: var(--primary);
}

/* ---------- Mystery Function ---------- */
.mf-clues { display: flex; flex-direction: column; gap: 10px; margin-bottom: 18px; }
.mf-clue {
  padding: 14px 16px; border-radius: var(--radius);
  background: var(--surface-2); border: 1px solid var(--border);
  color: var(--text); display: flex; gap: 12px; align-items: flex-start;
}
.mf-clue.locked { opacity: .45; }
.mf-clue-num {
  background: var(--primary); color: var(--on-primary);
  border-radius: 999px; min-width: 26px; height: 26px; display: grid; place-items: center;
  font-size: 12px; font-weight: 800;
}
.mf-clue.locked .mf-clue-num { background: var(--border-strong); color: var(--text-muted); }
.mf-guess-row { display: flex; gap: 10px; }
.mf-input {
  flex: 1; padding: 12px 14px; border-radius: var(--radius-sm);
  border: 2px solid var(--border-strong); background: var(--surface);
  font-size: 16px; font-weight: 700; font-family: 'JetBrains Mono', monospace;
  color: var(--text); text-transform: uppercase; outline: none;
}
.mf-input:focus { border-color: var(--primary); }

/* ---------- Grid Challenge 3x3 ---------- */
.gc-wrap { display: grid; grid-template-columns: 120px repeat(3, 1fr); gap: 8px; max-width: 640px; margin: 0 auto; }
.gc-cell {
  background: var(--surface-2); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 10px; min-height: 96px;
  display: flex; align-items: center; justify-content: center;
}
.gc-cat {
  background: var(--primary-50); color: var(--primary); font-weight: 700;
  font-size: 13px; text-align: center; padding: 10px; border-radius: var(--radius-sm);
  border: 1px solid var(--border-strong); min-height: 60px;
  display: flex; align-items: center; justify-content: center;
}
.gc-corner { background: transparent; border: none; }
.gc-cell input {
  width: 100%; height: 100%; border: 0; background: transparent; outline: none;
  text-align: center; font-family: 'JetBrains Mono', monospace;
  font-weight: 700; font-size: 14px; color: var(--text); text-transform: uppercase;
}
.gc-cell.ok { background: color-mix(in oklab, var(--correct) 18%, var(--surface)); border-color: var(--correct); }
.gc-cell.bad { background: color-mix(in oklab, var(--danger) 12%, var(--surface)); border-color: var(--danger); }
@media (max-width: 640px) {
  .gc-wrap { grid-template-columns: 70px repeat(3, 1fr); }
  .gc-cat { font-size: 11px; padding: 6px; }
}



/* ---------- Footer ---------- */
.foot { padding: 22px 0; text-align: center; font-size: 12px; color: var(--text-muted); border-top: 1px solid var(--border); }