/* Layout: copier control panel. Wide platen (preview) on the left, a narrow panel of
   grouped controls on the right; stacks to one column on phones. */
:root{
  --bg:#e9edf1;          /* platen glass blue-grey */
  --panel:#f7f9fb;
  --ink:#16202b;
  --muted:#5a6673;
  --line:#d3dae1;
  --accent:#2a43b8;      /* cobalt, like copier toner-blue UI */
  --accent-soft:#e3e8fb;
  --stage:#c4cbd2;
  --good:#1f7a4d;
  --display:"Bricolage Grotesque", "Segoe UI", system-ui, sans-serif;
  --body:"IBM Plex Sans", "Segoe UI", system-ui, sans-serif;
  --mono:"IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;
}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){
  --bg:#111519;--panel:#171c21;--ink:#e5e9ee;--muted:#93a0ad;--line:#2a3139;
  --accent:#93a5ff;--accent-soft:#232b4d;--stage:#0a0d10;--good:#6fcf9d;color-scheme:dark}}
:root[data-theme="dark"]{
  --bg:#111519;--panel:#171c21;--ink:#e5e9ee;--muted:#93a0ad;--line:#2a3139;
  --accent:#93a5ff;--accent-soft:#232b4d;--stage:#0a0d10;--good:#6fcf9d;color-scheme:dark}

html,body{height:100%}
body{background:var(--bg);color:var(--ink);font-family:var(--body);font-size:14px;line-height:1.45}
*{box-sizing:border-box}
[hidden]{display:none!important}
button,select,input{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}

.app{min-height:100%;display:flex;flex-direction:column;
  padding-left:max(16px, env(safe-area-inset-left, 0px));padding-right:max(16px, env(safe-area-inset-right, 0px));padding-block:12px 20px;gap:12px}

.top{display:flex;align-items:center;gap:16px;flex-wrap:wrap}
.brand{display:flex;align-items:baseline;gap:10px;margin-right:auto;min-width:0}
.brand h1{font-family:var(--display);font-weight:700;font-size:26px;letter-spacing:-.02em;margin:0;line-height:1}
.brand span{color:var(--muted);font-size:13px}
.btn{display:inline-flex;align-items:center;gap:8px;border:1px solid var(--line);background:var(--panel);
  padding:8px 14px;border-radius:8px;cursor:pointer;font-weight:500;white-space:nowrap}
.btn:hover{border-color:var(--accent)}
.btn.primary{background:var(--accent);border-color:var(--accent);color:var(--panel)}
.btn.primary:hover{filter:brightness(1.08)}
.btn[disabled]{opacity:.6;cursor:progress}
.btn.small{padding:5px 10px;font-size:13px}
input[type=file]{position:absolute;width:1px;height:1px;opacity:0;pointer-events:none}

.layout{display:grid;grid-template-columns:minmax(0,1fr) 340px;gap:16px;flex:1;min-height:0}
@media (max-width:900px){.layout{grid-template-columns:minmax(0,1fr)}}

.stage-col{display:flex;flex-direction:column;gap:10px;min-width:0}
.readout{display:flex;flex-wrap:wrap;gap:6px 14px;align-items:center;font-family:var(--mono);font-size:12px;color:var(--muted)}
.readout b{color:var(--ink);font-weight:500}
.readout .lamp{width:8px;height:8px;border-radius:50%;background:var(--good);display:inline-block;margin-right:6px;vertical-align:1px}
.readout .lamp.busy{background:var(--accent);animation:pulse 1s infinite}
@keyframes pulse{50%{opacity:.3}}
@media (prefers-reduced-motion:reduce){.readout .lamp.busy{animation:none}}
.example{font-family:var(--body);font-size:12px;background:var(--accent-soft);color:var(--ink);padding:2px 8px;border-radius:99px}

.stage{position:relative;background:var(--stage);border-radius:10px;overflow:auto;
  min-height:420px;height:calc(100vh - 230px);display:grid;place-items:center;padding:24px}
.stage.actual{place-items:start}
.frame{position:relative;line-height:0;box-shadow:0 1px 2px rgba(0,0,0,.18),0 8px 28px rgba(0,0,0,.18)}
.frame img,.frame canvas{display:block}
.stage:not(.actual) .frame img{max-width:100%;max-height:calc(100vh - 280px);min-height:0;width:auto;height:auto}
@media (max-width:900px){.stage{height:auto;min-height:0}.stage:not(.actual) .frame img{max-height:none}}
.before{position:absolute;inset:0;width:100%;height:100%}
.split-line{position:absolute;top:0;bottom:0;width:2px;background:var(--accent);pointer-events:none;transform:translateX(-1px)}
.split-line::after{content:"";position:absolute;top:50%;left:50%;width:22px;height:22px;border-radius:50%;
  background:var(--accent);transform:translate(-50%,-50%);box-shadow:0 0 0 3px rgba(255,255,255,.7)}
.split{position:absolute;inset:0;width:100%;height:100%;opacity:0;cursor:ew-resize;margin:0;-webkit-appearance:none;appearance:none}
.tag{position:absolute;top:10px;font:500 11px/1 var(--mono);letter-spacing:.06em;text-transform:uppercase;
  background:rgba(22,32,43,.78);color:#fff;padding:5px 7px;border-radius:4px;pointer-events:none}
.tag.l{left:10px}.tag.r{right:10px}
.frame:not(.compare) .before,.frame:not(.compare) .split,.frame:not(.compare) .split-line,.frame:not(.compare) .tag{display:none}
.drop{position:absolute;inset:8px;border:2px dashed var(--accent);border-radius:8px;background:color-mix(in srgb,var(--stage) 70%,transparent);
  display:grid;place-items:center;font-family:var(--display);font-size:22px;color:var(--ink);pointer-events:none}

.bar{display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.bar .sp{flex:1}
.seg{display:inline-flex;border:1px solid var(--line);border-radius:8px;overflow:hidden;background:var(--panel)}
.seg button{border:0;background:none;padding:5px 10px;cursor:pointer;font-size:13px}
.seg button[aria-pressed=true]{background:var(--accent-soft);color:var(--accent);font-weight:600}
.pager{font-family:var(--mono);font-size:12px;color:var(--muted);font-variant-numeric:tabular-nums}

.thumbs{display:flex;gap:8px;overflow-x:auto;padding-bottom:4px}
.thumbs button{flex:0 0 auto;border:2px solid transparent;border-radius:4px;padding:0;background:none;cursor:pointer;line-height:0;position:relative}
.thumbs button[aria-current=true]{border-color:var(--accent)}
.thumbs canvas{height:64px;width:auto;display:block;border-radius:2px;box-shadow:0 1px 3px rgba(0,0,0,.2)}
.thumbs span{position:absolute;bottom:2px;right:3px;font:500 10px/1 var(--mono);background:var(--panel);padding:2px 3px;border-radius:2px;color:var(--ink)}

.panel{background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:14px;display:flex;flex-direction:column;gap:16px;
  min-width:0;max-height:calc(100vh - 110px);overflow:auto}
@media (max-width:900px){.panel{max-height:none}}
.panel h2{font-family:var(--display);font-weight:500;font-size:13px;letter-spacing:.08em;text-transform:uppercase;margin:0;color:var(--muted)}
.presets{display:grid;grid-template-columns:1fr 1fr;gap:6px}
.presets button{text-align:left;border:1px solid var(--line);background:var(--bg);border-radius:8px;padding:8px 10px;cursor:pointer}
.presets button b{display:block;font-weight:600;font-size:13px}
.presets button small{color:var(--muted);font-size:11.5px;line-height:1.3;display:block}
.presets button[aria-pressed=true]{border-color:var(--accent);background:var(--accent-soft)}
.presets button:last-child:nth-child(odd){grid-column:span 2}
.custom-note{font-size:12px;color:var(--muted);margin:-8px 0 0}

#controls{display:grid;gap:18px}
fieldset{border:0;border-top:1px solid var(--line);margin:0;padding:14px 0 0;display:grid;gap:10px}
legend{font-family:var(--display);font-weight:500;font-size:13px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);padding:0 8px 0 0}
.row{display:grid;grid-template-columns:96px minmax(0,1fr) 52px;align-items:center;gap:10px}
.row label{font-size:13px}
.row output{font-family:var(--mono);font-size:11.5px;color:var(--muted);text-align:right;font-variant-numeric:tabular-nums}
.row select{grid-column:span 2;width:100%;border:1px solid var(--line);background:var(--bg);border-radius:6px;padding:5px 8px}
input[type=range]{width:100%;accent-color:var(--accent)}

.toast{position:fixed;left:50%;bottom:calc(20px + env(safe-area-inset-bottom,0px));transform:translateX(-50%);
  background:var(--ink);color:var(--panel);padding:10px 16px;border-radius:8px;font-size:13px;box-shadow:0 6px 20px rgba(0,0,0,.25);max-width:calc(100% - 32px)}
.foot{font-size:12px;color:var(--muted)}
.brand a{color:inherit;text-decoration:none}