:root {
  --paper: #efe7d8;
  --paper-2: #e6dcc8;
  --card: #f7f2e8;
  --ink: #1f1b16;
  --ink-2: #4a4238;
  --muted: #857a6b;
  --line: #cdbfa6;
  --red: #b83a1b;
  --red-2: #962c12;
  --shadow: 0 1px 0 rgba(255,255,255,.6) inset, 0 18px 40px -22px rgba(60,40,15,.45), 0 2px 6px -2px rgba(60,40,15,.18);
  --radius: 4px;
  --display: "Fraunces", Georgia, serif;
  --body: "Newsreader", Georgia, serif;
  --mono: "JetBrains Mono", ui-monospace, monospace;
  --scroll-thumb: rgba(184,58,27,.35);
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scrollbar-width: thin; scrollbar-color: var(--scroll-thumb) transparent; }
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--scroll-thumb); border-radius: 10px; border: 3px solid var(--paper); }

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font: 400 18px/1.5 var(--body);
  background:
    radial-gradient(1200px 600px at 50% -10%, #f6f0e4 0%, transparent 70%),
    radial-gradient(900px 700px at 110% 110%, #e4d7bf 0%, transparent 60%),
    var(--paper);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 0 20px 40px;
  -webkit-font-smoothing: antialiased;
}

.grain {
  position: fixed; inset: 0; pointer-events: none; z-index: 50;
  opacity: .22; mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 .35 0 0 0 0 .27 0 0 0 0 .16 0 0 0 .55 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ---------- Masthead ---------- */
.masthead { width: 100%; max-width: 1080px; text-align: center; padding-top: 22px; animation: rise .7s cubic-bezier(.2,.7,.2,1) both; }
.rule-top {
  display: flex; justify-content: space-between; align-items: center;
  font: 500 11px/1 var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--muted);
  border-bottom: 1px solid var(--ink); padding-bottom: 8px;
}
.lang {
  font: 600 11px/1 var(--mono); letter-spacing: .14em; color: var(--ink);
  background: none; border: 1px solid var(--ink); border-radius: 2px; padding: 5px 8px; cursor: pointer;
}
.lang:hover { background: var(--ink); color: var(--paper); }
.title {
  margin: 14px 0 0;
  font: 800 clamp(64px, 13vw, 148px)/1 var(--display);
  font-variation-settings: "opsz" 144, "SOFT" 50;
  letter-spacing: -.045em;
}
.tagline { margin: 4px 0 16px; font: italic 400 clamp(17px, 2.2vw, 21px)/1.3 var(--body); color: var(--ink-2); }
.rule-bottom { height: 5px; border-top: 3px solid var(--ink); border-bottom: 1px solid var(--ink); }

/* ---------- Stage ---------- */
.stage { width: 100%; max-width: 1080px; margin-top: 30px; animation: rise .8s .12s cubic-bezier(.2,.7,.2,1) both; }

.drop {
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 8px;
  min-height: min(56vh, 460px);
  background: var(--card);
  border: 1.5px dashed var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  cursor: pointer; text-align: center; padding: 30px;
  transition: border-color .2s, transform .2s, background .2s;
}
.drop:hover, .drop:focus-within { border-color: var(--red); background: #faf6ee; }
.drop:hover .drop-mark { transform: translateY(-4px); color: var(--red); }
.drop-mark { width: 64px; height: 64px; color: var(--ink); transition: transform .3s, color .3s; }
.drop-mark svg { width: 100%; height: 100%; }
.drop-title { font: 700 clamp(26px, 4vw, 36px)/1.1 var(--display); letter-spacing: -.02em; margin-top: 6px; }
.drop-sub { color: var(--ink-2); font-style: italic; }
.drop-formats { font: 500 11px/1 var(--mono); letter-spacing: .12em; color: var(--muted); margin-top: 10px; }
.drop.loading { pointer-events: none; }
.drop.loading .drop-mark { animation: bob 1s ease-in-out infinite; color: var(--red); }

.work { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 28px; align-items: start; }
.viewer { min-width: 0; }
.hint { margin: 18px 0 0; text-align: center; font: italic 400 14px/1 var(--body); color: var(--muted); }

/* Compact masthead while working, so the image gets the fold. */
.masthead, .title, .tagline, .stage { transition: all .45s cubic-bezier(.2,.7,.2,1); }
body.working .title { font-size: clamp(44px, 6vw, 64px); margin-top: 8px; }
body.working .tagline { font-size: 15px; margin: 10px 0 10px; }
body.working .stage { margin-top: 18px; }

/* ---------- Comparator ---------- */
.compare {
  position: relative; overflow: hidden; user-select: none; touch-action: none;
  background: var(--paper-2);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  outline: 8px solid var(--card);
  cursor: ew-resize;
  max-height: 76vh;
  margin: 8px auto;
}
.compare:focus-visible { outline-color: #fbe3d8; }
.layer { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: contain; display: block; }
.layer.after { clip-path: inset(0 0 0 var(--pos, 50%)); }
.divider {
  position: absolute; top: 0; bottom: 0; left: var(--pos, 50%); width: 0;
  border-left: 2px solid var(--card); box-shadow: 0 0 0 .5px rgba(31,27,22,.35);
  pointer-events: none;
}
.knob {
  position: absolute; top: 50%; left: 0; transform: translate(-50%, -50%);
  width: 44px; height: 44px; border-radius: 50%;
  background: var(--ink); color: var(--card);
  display: grid; place-items: center;
  box-shadow: 0 6px 16px -4px rgba(0,0,0,.45), 0 0 0 3px var(--card);
  transition: transform .15s;
}
.compare.dragging .knob { transform: translate(-50%, -50%) scale(1.08); background: var(--red); }
.knob svg { width: 22px; height: 22px; }
.tag {
  position: absolute; top: 12px; padding: 5px 9px;
  font: 600 10.5px/1 var(--mono); letter-spacing: .14em; text-transform: uppercase;
  background: rgba(247,242,232,.92); color: var(--ink); border-radius: 2px;
  pointer-events: none; transition: opacity .2s;
}
.tag-l { left: 12px; }
.tag-r { right: 12px; background: var(--ink); color: var(--card); }
.busy {
  position: absolute; left: 0; right: 0; bottom: 0; height: 3px; opacity: 0;
  background: linear-gradient(90deg, transparent, var(--red), transparent);
  background-size: 40% 100%; background-repeat: no-repeat;
  transition: opacity .2s;
}
.compare.working .busy { opacity: 1; animation: sweep 1s linear infinite; }

/* ---------- Controls ---------- */
.controls { position: sticky; top: 20px; display: flex; flex-direction: column; gap: 26px; padding-top: 8px; }

.strength-head { display: flex; justify-content: space-between; align-items: baseline; }
.strength-head label { font: 700 22px/1 var(--display); letter-spacing: -.01em; }
.strength-head output { font: 600 22px/1 var(--mono); color: var(--red); font-variant-numeric: tabular-nums; }
.range-wrap { position: relative; margin-top: 16px; }
.strength.secondary { margin-top: -6px; }
.strength.secondary .strength-head label, .strength.secondary .strength-head output { font-size: 18px; }
.strength.secondary .range-wrap { margin-top: 12px; }
.tick { position: absolute; left: var(--at); top: -4px; width: 1px; height: 30px; background: var(--ink); opacity: .35; pointer-events: none; }
.range-legend { display: flex; justify-content: space-between; font: 500 10.5px/1 var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--muted); margin-top: 10px; }

input[type=range] { -webkit-appearance: none; appearance: none; width: 100%; height: 22px; background: transparent; margin: 0; cursor: pointer; }
input[type=range]::-webkit-slider-runnable-track {
  height: 4px; border-radius: 2px;
  background: linear-gradient(90deg, var(--ink) var(--fill, 50%), var(--line) var(--fill, 50%));
}
input[type=range]::-moz-range-track { height: 4px; border-radius: 2px; background: var(--line); }
input[type=range]::-moz-range-progress { height: 4px; border-radius: 2px; background: var(--ink); }
input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none; width: 22px; height: 22px; margin-top: -9px; border-radius: 50%;
  background: var(--red); border: 3px solid var(--card); box-shadow: 0 2px 6px rgba(0,0,0,.3);
  transition: transform .12s;
}
input[type=range]::-moz-range-thumb {
  width: 16px; height: 16px; border-radius: 50%;
  background: var(--red); border: 3px solid var(--card); box-shadow: 0 2px 6px rgba(0,0,0,.3);
}
input[type=range]:active::-webkit-slider-thumb { transform: scale(1.15); }
input[type=range]:focus-visible { outline: 2px dashed var(--red); outline-offset: 6px; }

.switch { display: flex; gap: 12px; align-items: flex-start; cursor: pointer; }
.switch input { position: absolute; opacity: 0; pointer-events: none; }
.switch .track {
  flex: none; position: relative; width: 42px; height: 24px; margin-top: 1px; border-radius: 999px;
  background: var(--line); transition: background .2s;
}
.switch .thumb {
  position: absolute; top: 3px; left: 3px; width: 18px; height: 18px; border-radius: 50%;
  background: var(--card); box-shadow: 0 1px 3px rgba(0,0,0,.3); transition: transform .2s;
}
.switch input:checked + .track { background: var(--ink); }
.switch input:checked + .track .thumb { transform: translateX(18px); }
.switch input:focus-visible + .track { outline: 2px dashed var(--red); outline-offset: 3px; }
.switch-text { display: flex; flex-direction: column; gap: 2px; }
.switch-text b { font: 600 17px/1.2 var(--display); }
.switch-text small { font-size: 14px; color: var(--muted); font-style: italic; line-height: 1.3; }

.profiles { border: 0; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 8px; }
.profiles legend { font: 500 10.5px/1 var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--muted); margin-bottom: 10px; padding: 0; }
.chip {
  position: relative; display: flex; align-items: center; gap: 8px;
  padding: 7px 12px 7px 8px; border: 1px solid var(--line); border-radius: 999px;
  background: var(--card); cursor: pointer; font: 500 15px/1 var(--body);
  transition: border-color .15s, background .15s, color .15s, transform .15s;
}
.chip:hover { border-color: var(--ink); transform: translateY(-1px); }
.chip input { position: absolute; opacity: 0; pointer-events: none; }
.chip .sw { width: 18px; height: 18px; border-radius: 50%; box-shadow: inset 0 0 0 1px rgba(0,0,0,.15); }
.chip:has(input:checked) { background: var(--ink); color: var(--card); border-color: var(--ink); }
.chip:has(input:focus-visible) { outline: 2px dashed var(--red); outline-offset: 2px; }

.actions { display: flex; flex-direction: column; gap: 10px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  font: 700 18px/1 var(--display); letter-spacing: -.005em;
  border-radius: var(--radius); padding: 15px 18px; cursor: pointer;
  transition: background .15s, transform .1s, box-shadow .15s, color .15s;
}
.btn svg { width: 20px; height: 20px; }
.btn.primary { background: var(--red); color: #fff8ef; border: 0; box-shadow: 0 10px 22px -12px rgba(150,44,18,.9); }
.btn.primary:hover { background: var(--red-2); }
.btn.primary:active { transform: translateY(1px); }
.btn.primary[aria-busy=true] { opacity: .75; cursor: progress; }
.btn.ghost { background: transparent; color: var(--ink); border: 1px solid var(--ink); font-weight: 500; font-size: 16px; padding: 12px 18px; }
.btn.ghost:hover { background: var(--ink); color: var(--card); }
.actions .row { display: flex; gap: 10px; }
.actions .row .btn { flex: 1; }
.btn.small { font-size: 15px; padding: 9px 14px; margin-top: 14px; }
.btn.small svg { width: 17px; height: 17px; }
.fileinfo { margin: 0; font: 400 12px/1.5 var(--mono); color: var(--muted); word-break: break-all; }

/* ---------- Colophon, toast, veil ---------- */
.colophon { width: 100%; max-width: 1080px; margin-top: 48px; border-top: 1px solid var(--ink); padding-top: 14px; color: var(--ink-2); font-size: 15px; text-align: center; }
.colophon p { margin: 0 auto; max-width: 62ch; }

.toast {
  position: fixed; left: 50%; bottom: 24px; transform: translate(-50%, 20px); opacity: 0;
  background: var(--ink); color: var(--card); padding: 12px 18px; border-radius: var(--radius);
  font: 500 15px/1.3 var(--body); box-shadow: 0 12px 30px -10px rgba(0,0,0,.5);
  transition: opacity .25s, transform .25s; pointer-events: none; z-index: 60; max-width: calc(100vw - 40px);
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }
.toast.error { background: var(--red-2); }

.dropveil {
  position: fixed; inset: 0; z-index: 40; display: grid; place-items: center;
  background: rgba(239,231,216,.86); backdrop-filter: blur(3px);
  border: 3px dashed var(--red); opacity: 0; pointer-events: none; transition: opacity .15s;
  font: 800 clamp(40px, 8vw, 90px)/1 var(--display); color: var(--red); letter-spacing: -.03em;
}
.dropveil.on { opacity: 1; }

@keyframes rise { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }
@keyframes bob { 50% { transform: translateY(-6px); } }
@keyframes sweep { from { background-position: -40% 0; } to { background-position: 140% 0; } }

@media (max-width: 860px) {
  body { padding: 0 14px 30px; font-size: 17px; }
  .work { grid-template-columns: 1fr; gap: 18px; }
  .controls { position: static; gap: 22px; }
  .compare { max-height: 62vh; margin: 6px auto; outline-width: 6px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}