:root{
  --chrome-dark:#1c1815;
  --chrome-mid:#2b2621;
  --chrome-light:#3a332c;
  --accent:#c9a15a;
  --key-bg:#232019;
  --key-bg-hi:#33302a;
  --key-text:#f0e6d2;
  --paper-vintage:#f0e6d2;
  --paper-vintage-shadow:#c9b98c;
  --paper-white:#fbfaf7;
  --paper-white-shadow:#dcdad4;
  --ink-color:#2b2621;
  --highlight-color:#000000;
  --highlight-on:0;
  --font-size:20px;
  --roughness:0.25;
  --margin:18px;
  --safe-top:env(safe-area-inset-top,0px);
  --safe-bottom:env(safe-area-inset-bottom,0px);
}

*{box-sizing:border-box;-webkit-tap-highlight-color:transparent;user-select:none;}

html,body{
  height:100%;
  margin:0;
  overflow:hidden;
  background:var(--chrome-dark);
  font-family:'Vazirmatn','Special Elite',monospace;
  padding-top:var(--safe-top);
  padding-bottom:var(--safe-bottom);
}

#app{
  height:100%;
  display:flex;
  flex-direction:column;
  background:var(--chrome-dark);
}

/* ---------- Toolbar ---------- */
.toolbar{
  display:flex;
  align-items:center;
  justify-content:space-around;
  padding:8px 6px;
  background:linear-gradient(180deg,var(--chrome-mid),var(--chrome-dark));
  border-bottom:1px solid #000;
  flex:0 0 auto;
}
.tbtn{
  background:none;
  border:none;
  color:var(--key-text);
  width:38px;
  height:38px;
  display:flex;
  align-items:center;
  justify-content:center;
  border-radius:8px;
  opacity:.85;
  padding:0;
}
.tbtn:active{background:rgba(255,255,255,.08);opacity:1;transform:scale(.92);}
.tbtn svg{width:20px;height:20px;}
.tbtn.active{color:var(--accent);opacity:1;}
.lang-label{font-size:12px;font-weight:700;letter-spacing:.5px;font-family:sans-serif;}

/* ---------- Stage / Machine ---------- */
.stage{
  position:relative;
  flex:1 1 auto;
  min-height:0;
  display:flex;
  flex-direction:column;
  justify-content:flex-end;
  overflow:hidden;
  background:
    radial-gradient(ellipse at 50% 0%, #45403700 0%, #00000055 100%),
    var(--chrome-mid);
}
.machine-body{
  position:relative;
  height:22px;
  margin:0 14px;
  flex:0 0 auto;
  background:linear-gradient(180deg,var(--chrome-light),var(--chrome-dark));
  border-radius:6px 6px 0 0;
  box-shadow:0 -2px 6px rgba(0,0,0,.4) inset;
}
.knob{
  position:absolute;
  top:-9px;
  width:26px;height:26px;
  border-radius:50%;
  background:radial-gradient(circle at 35% 30%,#5a5148,#1a1713 75%);
  box-shadow:0 2px 4px rgba(0,0,0,.6);
}
.knob-left{left:-4px;}
.knob-right{right:-4px;}
.roller-shade{
  position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(0,0,0,.5),transparent);
}

.paper-window{
  flex:1 1 auto;
  min-height:0;
  margin:0 22px;
  position:relative;
  overflow:hidden;
  background:#00000030;
  border-radius:2px 2px 0 0;
  box-shadow:0 6px 18px rgba(0,0,0,.5) inset;
}

.paper{
  position:absolute;
  inset:0;
  transition:background .3s ease;
}
.paper[data-paper="vintage"]{
  background:
    radial-gradient(ellipse at 10% 0%, #00000018 0%, transparent 50%),
    radial-gradient(ellipse at 90% 100%, #00000018 0%, transparent 50%),
    linear-gradient(180deg, var(--paper-vintage-shadow) 0%, var(--paper-vintage) 6%, var(--paper-vintage) 100%);
}
.paper[data-paper="white"]{
  background:
    radial-gradient(ellipse at 10% 0%, #00000010 0%, transparent 50%),
    linear-gradient(180deg, var(--paper-white-shadow) 0%, var(--paper-white) 6%, var(--paper-white) 100%);
}
.paper.shake{ animation:paperShake .09s linear; }
.paper.shake-strong{ animation:paperShakeStrong .16s ease-out; }
@keyframes paperShake{
  0%{transform:translateY(0);}
  30%{transform:translateY(1.5px) rotate(.15deg);}
  60%{transform:translateY(-1px) rotate(-.1deg);}
  100%{transform:translateY(0);}
}
@keyframes paperShakeStrong{
  0%{transform:translateX(0);}
  20%{transform:translateX(-3px) rotate(-.4deg);}
  50%{transform:translateX(2px) rotate(.3deg);}
  80%{transform:translateX(-1px);}
  100%{transform:translateX(0);}
}

.paper-content{
  width:100%;
  height:100%;
  border:none;
  outline:none;
  resize:none;
  background:transparent;
  color:var(--ink-color);
  caret-color:var(--ink-color);
  font-family:'Special Elite',monospace;
  font-size:var(--font-size);
  line-height:1.7;
  padding:calc(var(--margin) + 10px) var(--margin) var(--margin);
  white-space:pre-wrap;
  word-break:break-word;
  text-shadow:
    0 0 calc(var(--roughness) * 1px) currentColor,
    calc(var(--roughness) * 0.6px) calc(var(--roughness) * 0.3px) 0 currentColor;
  background-image: linear-gradient(transparent, transparent);
}
.paper-content[data-highlight="1"]{
  background-image: repeating-linear-gradient(
    transparent, transparent calc(1.7em - 6px),
    var(--highlight-color) calc(1.7em - 6px), var(--highlight-color) 1.7em
  );
  background-attachment:local;
  opacity:.97;
}
.paper-content::placeholder{color:currentColor;opacity:.35;}

.feed-shadow{
  flex:0 0 8px;
  background:linear-gradient(180deg, rgba(0,0,0,.45), transparent);
  margin:0 22px;
}

/* ---------- Keyboard ---------- */
.keyboard-wrap{
  flex:0 0 auto;
  background:var(--chrome-dark);
  padding:6px 4px calc(6px + var(--safe-bottom));
  border-top:1px solid #000;
}
.keyboard{
  display:flex;
  flex-direction:column;
  gap:6px;
}
.krow{
  display:flex;
  gap:5px;
  justify-content:center;
}
.key{
  flex:1 1 0;
  min-width:0;
  height:42px;
  background:linear-gradient(180deg,var(--key-bg-hi),var(--key-bg));
  color:var(--key-text);
  border:none;
  border-radius:6px;
  font-size:16px;
  font-family:'Vazirmatn',sans-serif;
  box-shadow:0 2px 0 rgba(0,0,0,.5), 0 1px 0 rgba(255,255,255,.04) inset;
  display:flex;align-items:center;justify-content:center;
}
.key:active,.key.pressed{
  background:linear-gradient(180deg,var(--key-bg),var(--key-bg-hi));
  transform:translateY(2px);
  box-shadow:0 0 0 rgba(0,0,0,.5);
}
.key.wide{flex:1.7 1 0;font-size:13px;}
.key.space{flex:6 1 0;}
.key.enter{flex:1.9 1 0;background:linear-gradient(180deg,#3a3226,#221d16);}
.key.backspace{flex:1.5 1 0;}
.key.shift.active{background:linear-gradient(180deg,var(--accent),#8a6c2e);color:#1c1713;}
.key svg{width:18px;height:18px;}

/* ---------- Modals ---------- */
.overlay{
  position:fixed;inset:0;
  background:rgba(0,0,0,.55);
  display:flex;align-items:flex-end;justify-content:center;
  z-index:50;
}
.overlay.hidden{display:none;}
.modal{
  width:100%;
  max-width:520px;
  max-height:80vh;
  overflow-y:auto;
  background:#232019;
  color:var(--key-text);
  border-radius:16px 16px 0 0;
  padding:14px 18px calc(18px + var(--safe-bottom));
  animation:slideUp .22s ease-out;
}
.modal.small{max-width:420px;}
@keyframes slideUp{from{transform:translateY(30px);opacity:0;}to{transform:translateY(0);opacity:1;}}
.modal h3{margin:4px 0 10px;font-family:'Vazirmatn';}
.modal .hint{font-size:13px;opacity:.75;line-height:1.8;}

.modal-tabs{display:flex;gap:6px;margin-bottom:14px;border-bottom:1px solid #3a332c;}
.tab{
  flex:1;background:none;border:none;color:var(--key-text);
  padding:10px 4px;opacity:.55;font-family:'Vazirmatn';font-size:14px;
  border-bottom:2px solid transparent;
}
.tab.active{opacity:1;border-color:var(--accent);}
.tab-panel.hidden{display:none;}

.field{display:flex;flex-direction:column;gap:6px;margin-bottom:16px;font-size:14px;font-family:'Vazirmatn';}
.field input[type=range]{width:100%;accent-color:var(--accent);}
.checkbox-field{flex-direction:row;align-items:center;gap:10px;}
.checkbox-field input{width:18px;height:18px;accent-color:var(--accent);}

.swatches{display:flex;gap:10px;}
.swatch{width:30px;height:30px;border-radius:50%;border:2px solid transparent;padding:0;}
.swatch.active{border-color:var(--accent);}

.option-row{display:flex;gap:8px;}
.option-btn{
  flex:1;padding:10px;border-radius:8px;border:1px solid #4a4238;
  background:transparent;color:var(--key-text);font-family:'Vazirmatn';
}
.option-btn.active{background:var(--accent);color:#1c1713;border-color:var(--accent);}

.modal-close{
  width:100%;margin-top:6px;padding:12px;border:none;border-radius:10px;
  background:#3a332c;color:var(--key-text);font-family:'Vazirmatn';font-size:14px;
}

.wide-btn{
  display:block;width:100%;text-align:center;padding:12px;margin-bottom:10px;
  border-radius:10px;border:1px solid #4a4238;background:transparent;
  color:var(--key-text);font-family:'Vazirmatn';font-size:14px;cursor:pointer;
}
.file-btn{position:relative;}

.toast{
  position:fixed;bottom:calc(90px + var(--safe-bottom));left:50%;
  transform:translateX(-50%) translateY(20px);
  background:#1c1713;color:#f0e6d2;padding:9px 18px;border-radius:20px;
  font-family:'Vazirmatn';font-size:13px;opacity:0;pointer-events:none;
  transition:opacity .2s, transform .2s;
  z-index:100;box-shadow:0 4px 12px rgba(0,0,0,.4);
}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0);}

/* ---------- Landscape ---------- */
@media (orientation:landscape){
  .toolbar{padding:4px 6px;}
  .tbtn{width:32px;height:32px;}
  .key{height:34px;font-size:14px;}
  .krow{gap:4px;}
  .keyboard{gap:4px;}
  .keyboard-wrap{padding:4px 4px calc(4px + var(--safe-bottom));}
  .modal{max-height:90vh;}
}
@media (orientation:landscape) and (max-height:420px){
  .paper-content{padding-top:calc(var(--margin) + 4px);}
}