:root{
  --paper:#f4efe6;
  --paper-hi:#faf6ee;
  --paper-lo:#eae2d3;
  --ink:#161616;
  --muted:#7a7468;
  --orange:#e4572e;
  --blue:#2f5dff;

  --green:#2f7d4f;
  --amber:#dd9a26;
  --absent:#b9b1a3;
  --absent-ink:#4d4840;

  --serif:"Iowan Old Style","Palatino Linotype",Palatino,"Book Antiqua",Georgia,"Times New Roman",serif;
  --sans:ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Liberation Mono",monospace;

  --safe-top:env(safe-area-inset-top, 0px);
  --safe-bottom:env(safe-area-inset-bottom, 0px);
}

*{box-sizing:border-box}

html,body{
  margin:0;
  height:100%;
  background:var(--paper);
  overflow:hidden;
  overscroll-behavior:none;
}

body{
  font-family:var(--sans);
  color:var(--ink);
  -webkit-user-select:none;
  user-select:none;
  -webkit-tap-highlight-color:transparent;
  touch-action:manipulation;
}

/* printed-paper grain, above everything but never interactive */
body::after{
  content:"";
  position:fixed;
  inset:0;
  z-index:100;
  pointer-events:none;
  opacity:.055;
  mix-blend-mode:multiply;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size:160px 160px;
}

.app{
  position:fixed;
  inset:0;
  display:flex;
  flex-direction:column;
  padding-left:env(safe-area-inset-left, 0px);
  padding-right:env(safe-area-inset-right, 0px);
}

/* ---------- Masthead ---------- */
.masthead{
  flex:0 0 auto;
  display:grid;
  grid-template-columns:1fr auto 1fr;
  align-items:center;
  gap:10px;
  padding:calc(var(--safe-top) + 10px) 16px 10px;
  border-bottom:1.5px solid var(--ink);
  background:rgba(255,255,255,.2);
}

.brand{
  margin:0;
  justify-self:start;
  font-family:var(--serif);
  font-weight:600;
  font-size:clamp(19px,3.6vw,24px);
  line-height:1;
  letter-spacing:-.015em;
  color:var(--ink);
}
.brand::after{content:".";color:var(--orange);margin-left:.01em}

.mode{text-align:center;line-height:1.15;min-width:0}
.mode-name{
  display:block;
  font-family:var(--mono);
  font-size:10px;
  font-weight:600;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--ink);
}
.mode-date{
  display:block;
  margin-top:2px;
  font-family:var(--mono);
  font-size:9px;
  font-weight:500;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--muted);
  white-space:nowrap;
}

.tools{justify-self:end;display:flex;gap:8px}

.iconbtn{
  width:34px;height:34px;
  display:grid;place-items:center;
  padding:0;
  color:var(--ink);
  background:var(--paper);
  border:1.5px solid var(--ink);
  border-radius:0;
  cursor:pointer;
  box-shadow:2px 2px 0 var(--ink);
  transition:background .14s ease,color .14s ease,transform .1s ease,box-shadow .14s ease;
}
.iconbtn:hover{background:var(--ink);color:var(--paper)}
.iconbtn:active{transform:translate(1px,1px);box-shadow:1px 1px 0 var(--ink)}
.iconbtn:focus-visible{outline:2px solid var(--blue);outline-offset:2px}
.iconbtn svg{width:18px;height:18px;fill:currentColor;pointer-events:none}

/* ---------- Board ---------- */
.stage{
  flex:1 1 auto;
  min-height:0;
  display:grid;
  place-items:center;
  padding:clamp(5px,1.4vh,14px) 8px;
}

.board{
  --tile:clamp(32px, min(8.4vh, 16vw), 68px);
  --gap:clamp(4px, .75vh, 7px);
  display:flex;
  flex-direction:column;
  gap:var(--gap);
}

.brow{display:flex;gap:var(--gap)}
.board .tile{
  width:var(--tile);
  height:var(--tile);
  display:grid;
  place-items:center;
  border:1.5px solid rgba(22,22,22,.18);
  background:transparent;
  font-family:var(--sans);
  font-size:calc(var(--tile) * .46);
  font-weight:700;
  line-height:1;
  letter-spacing:.01em;
  text-transform:uppercase;
  color:var(--ink);
  transition:border-color .12s ease,background-color .12s ease;
}
.board .tile.filled{border-color:var(--ink);background:var(--paper-hi)}

/* reveal states: colours are applied at the flip midpoint by the animation */
.board .tile.correct{--tile-bg:var(--green);--tile-fg:var(--paper-hi)}
.board .tile.present{--tile-bg:var(--amber);--tile-fg:var(--ink)}
.board .tile.absent{--tile-bg:var(--absent);--tile-fg:var(--absent-ink)}

.board .tile.correct,
.board .tile.present,
.board .tile.absent{
  background-color:var(--tile-bg);
  color:var(--tile-fg);
  border-color:var(--tile-bg);
}

@keyframes flip{
  0%,49%{
    background-color:transparent;
    color:var(--ink);
    border-color:rgba(22,22,22,.18);
    transform:rotateX(0deg);
  }
  50%{
    background-color:var(--tile-bg);
    color:var(--tile-fg);
    border-color:var(--tile-bg);
    transform:rotateX(90deg);
  }
  100%{
    background-color:var(--tile-bg);
    color:var(--tile-fg);
    border-color:var(--tile-bg);
    transform:rotateX(0deg);
  }
}
.board .tile.reveal{animation:flip .5s ease both}

@keyframes pop{0%{transform:scale(.9)}100%{transform:scale(1)}}
.board .tile.pop{animation:pop .12s ease}

@keyframes shake{
  10%,90%{transform:translateX(-1px)}
  20%,80%{transform:translateX(2px)}
  30%,50%,70%{transform:translateX(-4px)}
  40%,60%{transform:translateX(4px)}
}
.brow.shake{animation:shake .45s ease}

@keyframes drop{
  0%{transform:translateY(0)}
  38%{transform:translateY(-13px)}
  100%{transform:translateY(0)}
}
.board .brow.win .tile:nth-child(1){animation:drop .5s ease}
.board .brow.win .tile:nth-child(2){animation:drop .5s ease .07s}
.board .brow.win .tile:nth-child(3){animation:drop .5s ease .14s}
.board .brow.win .tile:nth-child(4){animation:drop .5s ease .21s}
.board .brow.win .tile:nth-child(5){animation:drop .5s ease .28s}

/* ---------- Toast ---------- */
.toast{
  flex:0 0 auto;
  height:24px;
  display:grid;
  place-items:center;
  font-family:var(--mono);
  font-size:10px;
  font-weight:600;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--ink);
  opacity:0;
  transition:opacity .15s ease;
}
.toast.show{opacity:1}

/* ---------- Keyboard ---------- */
.keyboard{
  flex:0 0 auto;
  width:min(520px,100%);
  margin:0 auto;
  padding:0 8px calc(8px + var(--safe-bottom));
  display:flex;
  flex-direction:column;
  gap:clamp(4px,.7vh,7px);
}

.krow{display:flex;gap:clamp(4px,.7vw,6px);justify-content:center}

.key{
  flex:1 1 0;
  min-width:0;
  height:clamp(38px,6.4vh,50px);
  padding:0;
  display:grid;
  place-items:center;
  font-family:var(--sans);
  font-size:clamp(11px,1.6vh,13px);
  font-weight:600;
  line-height:1;
  color:var(--ink);
  background:var(--paper-hi);
  border:1.5px solid var(--ink);
  border-radius:0;
  cursor:pointer;
  box-shadow:2px 2px 0 var(--ink);
  touch-action:manipulation;
  transition:background .12s ease,color .12s ease,transform .08s ease,box-shadow .08s ease;
}
.key:hover{background:#fffdf7}
.key:active{transform:translate(1px,1px);box-shadow:1px 1px 0 var(--ink)}
.key:focus-visible{outline:2px solid var(--blue);outline-offset:2px}
.key.wide{flex:1.55 1 0;font-size:9.5px;letter-spacing:.12em}

.key.correct{background:var(--green);color:var(--paper-hi);border-color:var(--green);box-shadow:none}
.key.present{background:var(--amber);color:var(--ink);border-color:var(--amber);box-shadow:none}
.key.absent{background:var(--absent);color:var(--absent-ink);border-color:var(--absent);box-shadow:none}

/* ---------- Overlay ---------- */
.overlay{
  position:fixed;
  inset:0;
  z-index:20;
  display:grid;
  place-items:center;
  padding:
    calc(var(--safe-top) + 16px)
    max(16px, env(safe-area-inset-right))
    calc(var(--safe-bottom) + 16px)
    max(16px, env(safe-area-inset-left));
  background:rgba(244,239,230,.6);
  -webkit-backdrop-filter:blur(4px) saturate(.92);
  backdrop-filter:blur(4px) saturate(.92);
  opacity:0;
  pointer-events:none;
  transition:opacity .2s ease;
}
.overlay.show{opacity:1;pointer-events:auto}

.panel{
  width:min(440px,100%);
  max-height:calc(100dvh - 32px - var(--safe-top) - var(--safe-bottom));
  overflow:auto;
  overscroll-behavior:contain;
  padding:clamp(20px,4.4vw,30px);
  background:var(--paper-hi);
  border:1.5px solid var(--ink);
  border-radius:0;
  box-shadow:9px 9px 0 var(--ink);
  text-align:left;
  animation:rise .26s cubic-bezier(.2,.9,.25,1) both;
}
.panel[hidden]{display:none}
@keyframes rise{from{opacity:0;transform:translateY(9px)}to{opacity:1;transform:none}}

.panel-meta{
  display:flex;
  justify-content:space-between;
  gap:10px;
  padding-bottom:10px;
  margin-bottom:16px;
  border-bottom:1px solid rgba(22,22,22,.18);
  font-family:var(--mono);
  font-size:9.5px;
  font-weight:600;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--muted);
}

.panel-title{
  margin:0;
  font-family:var(--serif);
  font-weight:600;
  font-size:clamp(27px,7vw,38px);
  line-height:1.06;
  letter-spacing:-.02em;
  color:var(--ink);
}
.panel-title::after{content:".";color:var(--orange);margin-left:.01em}

.panel-copy{
  margin:12px 0 0;
  font-size:13px;
  line-height:1.7;
  color:var(--muted);
}
.panel-copy b{
  color:var(--ink);
  font-weight:600;
  border-bottom:1px solid rgba(22,22,22,.5);
  padding-bottom:1px;
}
#resultCopy b{
  font-family:var(--serif);
  font-size:1.2em;
  letter-spacing:.06em;
  border-bottom:2px solid var(--orange);
}
.panel-note{
  margin:12px 0 0;
  font-family:var(--mono);
  font-size:9px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--muted);
}

/* help examples */
.examples{margin-top:18px;display:flex;flex-direction:column;gap:14px}
.ex-word{display:flex;gap:5px}
.ex .tile{
  width:32px;height:32px;
  display:grid;place-items:center;
  border:1.5px solid rgba(22,22,22,.18);
  background:transparent;
  font-family:var(--sans);
  font-size:15px;
  font-weight:700;
  line-height:1;
  text-transform:uppercase;
}
.ex .tile.correct{background:var(--green);color:var(--paper-hi);border-color:var(--green)}
.ex .tile.present{background:var(--amber);color:var(--ink);border-color:var(--amber)}
.ex p{margin:7px 0 0;font-size:12px;line-height:1.55;color:var(--muted)}
.ex p b{color:var(--ink);font-weight:600}

/* stats */
.stats-grid{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:8px;
  margin:18px 0 6px;
}
.stat{min-width:0}
.stat-num{
  display:block;
  font-family:var(--serif);
  font-size:clamp(24px,6vw,32px);
  font-weight:600;
  line-height:1;
  font-variant-numeric:tabular-nums lining-nums;
  color:var(--ink);
}
.stat-label{
  display:block;
  margin-top:5px;
  font-family:var(--mono);
  font-size:8px;
  font-weight:600;
  letter-spacing:.1em;
  text-transform:uppercase;
  color:var(--muted);
}

.dist{margin-top:16px;display:flex;flex-direction:column;gap:5px}
.dist-row{display:flex;align-items:center;gap:8px}
.dist-n{
  width:10px;
  font-family:var(--mono);
  font-size:10px;
  font-weight:600;
  color:var(--muted);
}
.dist-track{flex:1;height:17px;background:rgba(22,22,22,.06)}
.dist-bar{
  height:100%;
  width:0;
  display:flex;
  align-items:center;
  justify-content:flex-end;
  padding-right:0;
  background:var(--green);
  color:var(--paper-hi);
  font-family:var(--mono);
  font-size:9px;
  font-weight:600;
  transition:width .4s ease;
}

/* buttons */
.actions{display:flex;flex-direction:column;gap:11px;margin-top:22px;counter-reset:act}

.btn{
  appearance:none;
  display:flex;
  align-items:center;
  gap:12px;
  width:100%;
  min-height:52px;
  padding:13px 16px;
  font-family:var(--sans);
  font-size:15px;
  font-weight:600;
  letter-spacing:.005em;
  text-align:left;
  color:var(--ink);
  background:var(--paper);
  border:1.5px solid var(--ink);
  border-radius:0;
  cursor:pointer;
  box-shadow:4px 4px 0 rgba(22,22,22,.9);
  transition:transform .1s ease,box-shadow .1s ease,background .14s ease,color .14s ease;
}
.btn::before{
  counter-increment:act;
  content:counter(act,decimal-leading-zero);
  font-family:var(--mono);
  font-size:10px;
  font-weight:600;
  letter-spacing:.1em;
  opacity:.55;
}
.btn::after{
  content:"\2192";
  margin-left:auto;
  font-size:17px;
  line-height:1;
  opacity:0;
  transform:translateX(-5px);
  transition:opacity .14s ease,transform .14s ease;
}
.btn:hover{background:#fffdf7}
.btn:hover::after{opacity:1;transform:none}
.btn:active{transform:translate(2px,2px);box-shadow:2px 2px 0 rgba(22,22,22,.9)}
.btn:focus-visible{outline:2px solid var(--blue);outline-offset:2px}

.btn.primary{color:var(--paper-hi);background:var(--ink);box-shadow:4px 4px 0 var(--orange)}
.btn.primary:hover{background:#000}
.btn.primary:active{box-shadow:2px 2px 0 var(--orange)}

.btn.ghost{background:transparent;box-shadow:none}
.btn.ghost:hover{background:rgba(22,22,22,.045)}

/* ---------- Compact screens ---------- */
@media (max-width:380px){
  .masthead{padding-left:12px;padding-right:12px}
  .brand{font-size:18px}
  .mode-name{font-size:9px;letter-spacing:.2em}
  .mode-date{font-size:8px}
  .iconbtn{width:31px;height:31px}
  .iconbtn svg{width:16px;height:16px}
  .panel{box-shadow:7px 7px 0 var(--ink)}
}

@media (max-height:560px){
  .masthead{padding-top:calc(var(--safe-top) + 6px);padding-bottom:6px}
  .brand{font-size:18px}
  .stage{padding:4px 8px}
  .board{--tile:clamp(30px, min(8.6vh, 16vw), 52px);--gap:5px}
  .toast{height:20px}
  .keyboard{gap:4px;padding-bottom:calc(4px + var(--safe-bottom))}
  .key{height:36px;font-size:11px}
  .panel{padding:16px 18px}
  .panel-meta{margin-bottom:12px;padding-bottom:8px}
  .panel-title{font-size:clamp(23px,5.6vw,30px)}
  .examples{margin-top:12px;gap:10px}
  .actions{margin-top:14px;gap:8px}
  .btn{min-height:42px;padding:9px 13px;font-size:14px}
  .stats-grid{margin-top:12px}
}

@media (max-height:400px){
  .masthead{padding-top:calc(var(--safe-top) + 4px);padding-bottom:4px}
  .brand{font-size:16px}
  .mode-name{font-size:8px}
  .mode-date{display:none}
  .iconbtn{width:28px;height:28px;box-shadow:1.5px 1.5px 0 var(--ink)}
  .iconbtn svg{width:14px;height:14px}
  .stage{padding:2px 6px}
  .board{--tile:clamp(24px, 7vh, 46px);--gap:4px}
  .toast{height:16px;font-size:9px}
  .keyboard{gap:3px;padding-bottom:calc(3px + var(--safe-bottom))}
  .key{height:29px;font-size:10px}
  .key.wide{font-size:8.5px}
}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
}