:root{--bg:#F6F7F9;--panel:#fff;--ink:#0F1B33;--mute:#5B6678;--line:#DDE2EA;--accent:#2457F5;--ok:#1B7F4B;--warn:#B45309;--r:12px}
@media(prefers-color-scheme:dark){:root{--bg:#0C111B;--panel:#141B29;--ink:#E8ECF3;--mute:#98A3B5;--line:#263146;--accent:#6C8DFF;--ok:#4CC38A;--warn:#F0A04B}}
*{box-sizing:border-box}html{scroll-padding-top:env(safe-area-inset-top,0px)}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.55 "Instrument Sans",system-ui,-apple-system,"Segoe UI",sans-serif;padding:env(safe-area-inset-top,0px) 0 env(safe-area-inset-bottom,0px)}
a{color:var(--accent)}.wrap{max-width:1240px;margin:0 auto;padding:0 24px}
header{border-bottom:1px solid var(--line);background:var(--panel)}header .wrap{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:64px;flex-wrap:wrap}
.logo{font-weight:700;font-size:19px;color:var(--ink);text-decoration:none;letter-spacing:-.02em}nav{display:flex;gap:20px;flex-wrap:wrap}nav a{color:var(--mute);text-decoration:none;padding:4px 0;border-bottom:2px solid transparent}nav a:hover,nav a[aria-current]{color:var(--ink);border-color:var(--accent)}
a:focus-visible,button:focus-visible,select:focus-visible,input:focus-visible,.drop:focus-visible{outline:3px solid var(--accent);outline-offset:2px}
h1{font-size:clamp(30px,4vw,44px);line-height:1.1;letter-spacing:-.03em;margin:40px 0 24px;max-width:22ch}h2{font-size:20px;line-height:1.25;margin:0;letter-spacing:-.01em}
.upload-panel{max-width:760px;margin:0 auto 64px}.drop{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px;text-align:center;min-height:300px;border:2px dashed var(--line);border-radius:14px;background:var(--panel);cursor:pointer;padding:24px;transition:border-color .15s,background .15s}.drop:hover,.drop.over{border-color:var(--accent);background:color-mix(in srgb,var(--accent) 6%,var(--panel))}.drop strong{font-size:20px}.drop small{color:var(--mute)}.drop.processing-drop{cursor:wait;border-style:solid}.drop.processing-drop strong{font-weight:700}.drop.processing-drop::after{content:"";width:24px;height:24px;margin-top:12px;border:3px solid var(--line);border-top-color:var(--accent);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}
.processing{text-align:center;color:var(--mute);margin:14px 0}.status.warn{color:var(--warn);text-align:center}
.work{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);align-items:stretch;gap:20px;margin-bottom:56px}.work[hidden],.upload-panel[hidden]{display:none}
@media(max-width:760px){.work{grid-template-columns:1fr}.wrap{padding:0 16px}}
.panel{background:var(--panel);border:1px solid var(--line);border-radius:var(--r);padding:20px;min-width:0;box-shadow:0 8px 28px #1023450a}.result-heading{font-size:18px;min-height:28px;margin-bottom:14px}.result-heading.ok{color:var(--ok)}.result-heading.warn{color:var(--warn)}
.stats{display:flex;gap:24px;flex-wrap:wrap;padding:0 0 14px}.stats div{display:grid;gap:0}.stats strong{font-size:20px}.stats span{font-size:12px;color:var(--mute)}
.visual-frame{position:relative;width:100%;aspect-ratio:900/1273;overflow:hidden;border:1px solid var(--line);border-radius:9px;background:#fff;isolation:isolate}.scan-base,.native-page,.text-layer{position:absolute;inset:0;display:block;width:100%;height:100%;object-fit:contain}.scan-base{z-index:0}.native-page{z-index:0}
.scan-fade{background:#fff}.text-layer{z-index:1;object-fit:contain}.source-layer{animation:fade-source 10s infinite}.target-layer{animation:fade-target 10s infinite}
@keyframes fade-source{0%,40%{opacity:1}50%,90%{opacity:0}100%{opacity:1}}@keyframes fade-target{0%,40%{opacity:0}50%,90%{opacity:1}100%{opacity:0}}
.gate{position:absolute;z-index:4;inset:auto 0 0;min-height:112px;display:flex;align-items:flex-end;padding:40px 16px 14px;background:linear-gradient(transparent,rgba(255,255,255,.96) 65%);font-size:14px;color:#0F1B33}.gate strong{font-size:15px}
.missing-preview,.missing-source{position:absolute;inset:0;display:grid;place-items:center;padding:24px;color:var(--mute);text-align:center}.translation-stats{min-height:54px;padding-top:12px}.translation-actions{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;margin-top:12px}.target-language{display:flex;align-items:center;gap:9px;font-weight:600}.target-language select{font:inherit;font-weight:400;color:var(--ink);background:var(--panel);border:1px solid var(--line);border-radius:8px;padding:7px 9px;max-width:155px}.action-button{font:inherit;font-weight:700;background:var(--accent);color:#fff;border-radius:9px;padding:12px 18px;text-decoration:none;display:inline-flex;align-items:center;justify-content:center;min-height:48px;white-space:nowrap;box-shadow:0 3px 8px #2457f533}.action-button:hover{background:color-mix(in srgb,var(--accent) 85%,black)}
footer{border-top:1px solid var(--line);color:var(--mute);font-size:14px;padding:20px 0}
@media(prefers-reduced-motion:reduce){.source-layer,.target-layer{animation:none}.source-layer{opacity:1}.target-layer{opacity:0}.drop.processing-drop::after{animation:none;border-top-color:var(--accent)}*,*::before,*::after{transition:none!important}}