:root{
  --bg:#0b0d10; --panel:#14181d; --panel2:#1b2027; --ink:#e6edf3;
  --muted:#8b98a5; --accent:#5ad1ff; --accent2:#ff5a8a; --line:#252c34;
  --warn:#ffcc66; --warn-bg:#2a2210;
  --sat:env(safe-area-inset-top,0px); --sar:env(safe-area-inset-right,0px);
  --sab:env(safe-area-inset-bottom,0px); --sal:env(safe-area-inset-left,0px);
  color-scheme:dark;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);overflow-x:hidden;
  padding:var(--sat) var(--sar) var(--sab) var(--sal);
  font:15px/1.5 system-ui,-apple-system,Segoe UI,Roboto,sans-serif}
a{color:var(--accent)}
img,canvas,video{max-width:100%}
header{padding:24px 20px 8px;max-width:1200px;margin:0 auto}
h1{margin:0 0 6px;font-size:24px;letter-spacing:.3px;overflow-wrap:anywhere}
.sub{margin:0;color:var(--muted);max-width:70ch}
main{max-width:1200px;margin:0 auto;padding:16px 20px;
  display:grid;grid-template-columns:minmax(0,1fr) 340px;gap:20px;align-items:start}
main>*{min-width:0}
main>#dropzone{grid-column:1;grid-row:1}
main>#status{grid-column:1;grid-row:2;align-self:start;margin:0}
main>#controls{grid-column:2;grid-row:1 / span 3}
main{grid-template-rows:auto auto 1fr}

/* preview / dropzone */
#dropzone,#canvas-wrap{position:relative;flex-direction:column;gap:0;background:#000;border:1px solid var(--line);border-radius:10px;
  overflow:hidden;min-height:200px;display:flex;justify-content:center;align-items:center;
  transition:border-color .15s,box-shadow .15s}
#dropzone.dragover,#dropzone.drag-over,#dropzone.dragging,#dropzone.is-dragover,#dropzone[data-drag=true],
#canvas-wrap.dragover{
  border:1px dashed var(--accent);box-shadow:0 0 0 3px rgba(90,209,255,.35) inset,0 0 0 2px rgba(90,209,255,.25)}
#dropzone.dragover::after,#dropzone.drag-over::after,#dropzone.dragging::after,#dropzone.is-dragover::after,#dropzone[data-drag=true]::after{
  content:"Drop image to glitch";position:absolute;inset:0;display:flex;align-items:center;justify-content:center;
  background:rgba(11,13,16,.7);color:var(--accent);font-weight:600;pointer-events:none}
canvas#out,#dropzone canvas,#canvas-wrap canvas{display:block;max-width:100%!important;width:auto;height:auto!important;
  image-rendering:auto;touch-action:manipulation}
@media (min-resolution:2dppx){canvas#out{image-rendering:auto}}

#controls{display:flex;flex-direction:column;gap:14px;min-width:0}
.group{background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:14px;min-width:0}
.group h2{margin:0 0 10px;font-size:12px;text-transform:uppercase;
  letter-spacing:1.2px;color:var(--accent)}
label{display:block;margin:12px 0 0;font-size:13px;color:var(--ink)}
label:first-of-type{margin-top:0}
.group>label.file{margin:0}
label output{color:var(--accent2);font-variant-numeric:tabular-nums}

/* range: generous tap target (iOS) */
input[type=range]{width:100%;margin:6px 0 0;accent-color:var(--accent);
  height:44px;background:transparent;cursor:pointer;touch-action:pan-y;-webkit-appearance:none;appearance:none}
input[type=range]::-webkit-slider-runnable-track{height:6px;border-radius:3px;background:var(--line)}
input[type=range]::-moz-range-track{height:6px;border-radius:3px;background:var(--line)}
input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;appearance:none;width:28px;height:28px;margin-top:-11px;
  border-radius:50%;background:var(--accent);border:2px solid var(--bg)}
input[type=range]::-moz-range-thumb{width:24px;height:24px;border-radius:50%;background:var(--accent);border:2px solid var(--bg)}
input[type=range]:disabled{opacity:.4;cursor:not-allowed}

select{width:100%;margin-top:6px;background:var(--panel2);color:var(--ink);
  border:1px solid var(--line);border-radius:6px;padding:10px;min-height:44px;font-size:16px}
input[type=file]{max-width:100%}

button{cursor:pointer;border:1px solid var(--line);background:var(--panel2);
  color:var(--ink);border-radius:8px;padding:12px 14px;font:inherit;font-size:14px;width:100%;min-height:44px;
  touch-action:manipulation;-webkit-tap-highlight-color:transparent}
button:hover{border-color:var(--accent)}
button.primary,#savePng,#saveGif{background:var(--accent);color:#04121a;font-weight:600;border-color:var(--accent)}
button.secondary{background:transparent}
button:disabled,button[disabled],button[aria-disabled=true]{opacity:.45;cursor:not-allowed;
  background:var(--panel2);color:var(--muted);border-color:var(--line)}
button.primary:disabled,#savePng:disabled,#saveGif:disabled{background:var(--panel2);color:var(--muted)}
#gifCancel{border-color:var(--accent2);color:var(--accent2);background:transparent}
#gifCancel[hidden],[hidden]{display:none!important}

:focus-visible{outline:3px solid var(--accent);outline-offset:2px;border-radius:4px}
button:focus-visible,select:focus-visible,#levels button:focus-visible{outline:3px solid var(--accent);outline-offset:2px}
input[type=range]:focus-visible{outline-offset:0}
input:focus:not(:focus-visible),button:focus:not(:focus-visible),select:focus:not(:focus-visible){outline:none}

.row{display:flex;gap:8px;margin-top:8px;flex-wrap:wrap}
.row>*{flex:1 1 120px;min-width:0}
.file{display:block}
.file input{margin-top:6px;width:100%;font-size:14px;color:var(--muted);min-height:44px}
.file input::file-selector-button{min-height:44px;padding:0 14px;margin-right:10px;border-radius:8px;
  border:1px solid var(--line);background:var(--panel2);color:var(--ink);font:inherit;cursor:pointer}
.check{display:flex;align-items:center;gap:10px;margin-top:12px;min-height:44px;cursor:pointer}
.check input{width:28px;height:28px;margin:0;accent-color:var(--accent);flex:none}
.hint{margin:8px 0 0;padding:0 10px;text-align:center;font-size:12px;color:var(--muted)}

/* level segmented control */
#levels{display:flex;width:100%;gap:0;border:1px solid var(--line);border-radius:10px;overflow:hidden;background:var(--panel2)}
#levels button{flex:1 1 0;white-space:normal;line-height:1.15;overflow-wrap:normal;hyphens:none;min-width:0;width:auto;border:0;border-radius:0;background:transparent;
  border-right:1px solid var(--line);padding:6px 1px;min-height:52px;font-size:12px;font-weight:600;color:var(--muted)}
#dropzone .hint{margin:0;padding:8px 10px;color:var(--muted);width:100%;border-top:1px solid var(--line);background:var(--panel)}
.group .hint{padding:0;text-align:left}
.group>button,.group>select,.group>input[type=file],.group>progress{margin-top:8px}
code{overflow-wrap:anywhere}
.noscript{margin:0;padding:10px 20px;background:var(--warn-bg);color:var(--warn)}
#levels button:last-child{border-right:0}
#levels button:hover{color:var(--ink);background:rgba(90,209,255,.08)}
#levels button[aria-pressed=true]{background:var(--accent);color:#04121a}
#levels button:focus-visible{outline-offset:-3px;border-radius:0;position:relative;z-index:1}

/* progress / info / status */
progress#gifProgress{display:block;width:100%;height:12px;margin:10px 0 0;border:0;border-radius:6px;
  overflow:hidden;background:var(--line);-webkit-appearance:none;appearance:none}
progress#gifProgress::-webkit-progress-bar{background:var(--line);border-radius:6px}
progress#gifProgress::-webkit-progress-value{background:linear-gradient(90deg,var(--accent),var(--accent2));border-radius:6px;transition:width .15s}
progress#gifProgress::-moz-progress-bar{background:linear-gradient(90deg,var(--accent),var(--accent2));border-radius:6px}
#gifInfo{margin:8px 0 0;font-size:12px;color:var(--muted);overflow-wrap:anywhere;font-variant-numeric:tabular-nums}
#gifInfo.warn,#gifInfo .warn{color:var(--warn)}
#status{margin:0;font-size:13px;color:var(--muted);overflow-wrap:anywhere}
#status:empty{display:none}
#status:not(:empty){padding:10px 12px;border:1px solid var(--line);border-left:3px solid var(--accent);
  border-radius:8px;background:var(--panel2);color:var(--ink)}
#status.warn,.notice.warn,.warn#status{border-left-color:var(--warn);background:var(--warn-bg);color:var(--warn);border-color:#4a3c14}
#status.error,#status.err{border-left-color:var(--accent2);color:var(--accent2)}

#how{max-width:1200px;margin:8px auto 40px;padding:20px;
  background:var(--panel);border:1px solid var(--line);border-radius:10px;overflow-wrap:anywhere}
#how h2{margin-top:0;color:var(--accent)}
#how code{background:var(--panel2);padding:1px 5px;border-radius:4px;font-size:13px}
.repo{color:var(--muted);border-top:1px solid var(--line);padding-top:12px;margin-top:16px}

@media(min-width:861px){
  main>#dropzone{position:sticky;top:12px;align-self:start}
  main>#dropzone canvas#out{width:100%;height:auto!important;max-height:calc(100vh - 90px);object-fit:contain}
}
@media(max-width:860px){
  main{grid-template-columns:minmax(0,1fr);grid-template-rows:none;padding:12px 12px 12px}
  main>#dropzone,main>#status,main>#controls{grid-column:1;grid-row:auto}
  main>#dropzone{position:sticky;top:max(6px,var(--sat));z-index:5;min-height:0;box-shadow:0 6px 16px rgba(0,0,0,.6)}
  #dropzone canvas#out{width:100%;height:36vh!important;max-height:36vh;object-fit:contain}
  #dropzone .hint{display:none}
  header{padding:16px 14px 4px}
  h1{font-size:21px}
  #how{margin:8px 12px 40px;padding:16px}
  .export-bar,#exportBar{position:sticky;bottom:0;z-index:5;background:rgba(20,24,29,.96);
    padding:10px 12px calc(10px + var(--sab));border-top:1px solid var(--line)}
}
@media(max-width:420px){
  #levels button{font-size:11px;min-height:56px}
}
@media(max-width:360px){
  body{font-size:14px} h1{font-size:19px}
  .group{padding:12px}
}
@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001ms!important;animation-iteration-count:1!important;
    transition-duration:.001ms!important;scroll-behavior:auto!important}
}
#gifCancel:disabled{border-color:var(--line);color:var(--muted)}