:root{--white:#fff;--g50:#fafafa;--g100:#f4f4f4;--g200:#e6e6e6;--g300:#d0d0d0;--g500:#666;--g700:#4a4a4a;--g900:#1a1a1a;--black:#000;--bg:#fff;--border:var(--g200);--text:var(--g900);--muted:var(--g700);--shadow-sm:0 1px 2px rgba(0,0,0,.06);--shadow-md:0 4px 12px rgba(0,0,0,.08);--shadow-lg:0 12px 32px rgba(0,0,0,.14);--radius:12px;--font:system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;--mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}
*{box-sizing:border-box}html{min-width:320px}body{margin:0;background:var(--bg);color:var(--text);font:16px/1.5 var(--font)}button,input{font:inherit}button{cursor:pointer}button:focus-visible,a:focus-visible,input:focus-visible{outline:2px solid #000;outline-offset:3px}.topbar{height:76px;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;padding:0 max(20px,calc((100vw - 960px)/2));gap:16px}.brand{display:flex;align-items:center;gap:10px;color:var(--text);text-decoration:none;font-weight:750;font-size:18px;letter-spacing:-.4px}.brand-mark{width:30px;height:30px;border-radius:8px;background:#111;color:#fff;display:grid;place-items:center;font-weight:800}.device-self{display:flex;align-items:center;gap:8px;font-size:13px}.status-dot{width:7px;height:7px;border-radius:50%;background:#111;display:inline-block}.muted{color:var(--muted)}.name-chip{border:1px solid var(--border);border-radius:999px;background:var(--g50);padding:7px 11px;font-size:13px;font-weight:650;min-height:36px}.name-chip span{margin-left:4px;color:var(--g500)}.shell{max-width:960px;margin:auto;padding:0 24px}.intro{display:flex;align-items:flex-end;justify-content:space-between;gap:28px;padding:52px 0 38px}.eyebrow,.section-label{font-size:11px;letter-spacing:.12em;font-weight:750;color:var(--g700);margin:0 0 10px}.intro h1{font-size:clamp(38px,6vw,58px);line-height:1.03;letter-spacing:-2.8px;margin:0;font-weight:760}.muted-heading{color:#888}.lead{margin:18px 0 0;color:var(--g700);font-size:16px}.intro-note{display:flex;align-items:center;gap:10px;max-width:230px;color:var(--g700);font-size:12px;padding-bottom:4px}.lock-icon{width:34px;height:34px;border:1px solid var(--border);border-radius:10px;display:grid;place-items:center;font-size:20px;color:#111;flex:none}.share-box{border:1px solid var(--border);border-radius:var(--radius);padding:20px;display:flex;align-items:center;justify-content:space-between;gap:20px;margin-bottom:44px;box-shadow:var(--shadow-sm)}.share-copy{flex:1;min-width:0}.share-help{font-size:13px;color:var(--g700);margin:0 0 14px}.url-row{display:flex;gap:8px;align-items:center}.url-row code{font:12px var(--mono);overflow-wrap:anywhere;background:var(--g50);border:1px solid var(--border);border-radius:7px;padding:11px 12px;flex:1;min-width:0}.button{min-height:44px;padding:0 16px;border-radius:7px;font-size:13px;font-weight:700;border:1px solid #111;transition:box-shadow .14s,transform .14s}.button:hover{box-shadow:var(--shadow-md)}.button:active{transform:translateY(1px)}.primary{background:#111;color:#fff}.secondary{background:#fff;color:#111}.tiny-note{font-size:11px;color:var(--g700);margin:12px 0 0}.qr-box{width:116px;height:116px;display:grid;place-items:center;flex:none;background:#fff}.qr-box canvas,.qr-box img{width:112px;height:112px;image-rendering:pixelated}.qr-placeholder{font-size:11px;color:var(--g700);text-align:center}.file-drop-zone{border:2px dashed var(--g300);border-radius:var(--radius);padding:28px 18px;text-align:center;margin:0 0 38px;background:var(--g50);transition:border-color .15s,background .15s}.file-drop-zone.dragover{border-color:#111;background:#f0f0f0}.drop-symbol{width:42px;height:42px;border:1px solid var(--g300);border-radius:12px;display:grid;place-items:center;font-size:27px;margin:0 auto 10px;background:#fff}.file-drop-zone h2{font-size:19px;margin:0 0 5px;letter-spacing:-.4px}.file-drop-zone p{font-size:13px;color:var(--g700);margin:0 auto 14px}.file-drop-zone .drop-hint{font-size:11px;margin:12px 0 0}.file-drop-zone .button{min-width:140px}.devices-section{padding-bottom:42px}.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:12px;margin-bottom:18px}.section-label{margin-bottom:4px}.section-head h2{font-size:23px;letter-spacing:-.7px;margin:0;font-weight:740}.count{font:12px var(--mono);color:var(--g700);background:var(--g100);border-radius:6px;padding:4px 7px;vertical-align:3px;margin-left:4px}.connection-label{font-size:12px;color:var(--g700);padding-bottom:4px}.device-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px}.device-card{min-width:0;text-align:left;min-height:132px;padding:16px;border:1px solid var(--border);border-radius:var(--radius);background:#fff;box-shadow:var(--shadow-sm);display:flex;flex-direction:column;align-items:flex-start;gap:8px;transition:box-shadow .14s,border-color .14s,transform .14s}.device-card:hover{box-shadow:var(--shadow-md);border-color:var(--g300)}.device-card:active{transform:translateY(1px)}.device-card.dragover{border:2px dashed #111;background:var(--g50)}.device-icon{width:34px;height:34px;display:grid;place-items:center;border:1px solid var(--border);border-radius:9px;font-size:20px}.device-name{font-size:14px;font-weight:700;overflow-wrap:anywhere}.device-type{font-size:12px;color:var(--g700);text-transform:capitalize}.empty-state{text-align:center;padding:42px 18px 24px;border:1px dashed var(--g300);border-radius:var(--radius);margin-top:2px}.empty-icon{font-size:36px;color:#555;line-height:1;margin-bottom:12px}.empty-state h3{font-size:16px;margin:0 0 6px}.empty-state>p{font-size:13px;color:var(--g700);margin:0 auto;max-width:360px}.tips{display:flex;justify-content:center;gap:8px;flex-wrap:wrap;margin-top:22px}.tips span{font-size:11px;color:var(--g700);background:var(--g50);border:1px solid var(--border);border-radius:6px;padding:7px 10px}.transfers-section{padding:4px 0 40px}.text-button{border:0;background:none;text-decoration:underline;color:var(--g700);font-size:12px;padding:8px}.transfer-list{display:grid;gap:10px}.transfer-row{border:1px solid var(--border);border-radius:10px;padding:14px 16px;display:grid;grid-template-columns:minmax(0,1fr) auto;gap:8px 14px;align-items:center}.transfer-main{min-width:0}.transfer-title{font-size:13px;font-weight:700;overflow-wrap:anywhere}.transfer-sub{font-size:11px;color:var(--g700);margin-top:2px}.transfer-status{font-size:12px;text-align:right;color:var(--g700)}.progress-track{height:6px;background:var(--g200);border-radius:99px;overflow:hidden;margin-top:11px}.progress-fill{height:100%;width:0;background:#111;transition:width .1s linear}.transfer-bottom{display:flex;justify-content:space-between;align-items:center;gap:8px;font:11px var(--mono);color:var(--g700);margin-top:7px}.small-button{min-height:34px;padding:0 11px;font-size:11px}.keep-open{text-align:center;font-size:12px;color:var(--g700);margin:0 0 20px}footer{max-width:960px;margin:auto;padding:20px 24px 28px;border-top:1px solid var(--border);display:flex;justify-content:space-between;gap:12px;color:var(--g700);font-size:11px}footer span:first-child{font-weight:650}.backdrop{position:fixed;inset:0;background:rgba(0,0,0,.42);z-index:10;display:grid;place-items:center;padding:20px}.backdrop[hidden],[hidden]{display:none!important}.dialog{background:#fff;width:min(100%,420px);border-radius:14px;padding:26px;box-shadow:var(--shadow-lg)}.dialog h2{font-size:23px;margin:0 0 8px;letter-spacing:-.6px}.dialog-description{font-size:13px;color:var(--g700);margin:0 0 20px}.incoming-file{display:flex;align-items:center;gap:12px;padding:13px;border:1px solid var(--border);border-radius:9px}.file-icon{height:38px;width:38px;display:grid;place-items:center;border-radius:8px;background:var(--g100);font-size:22px}.incoming-file div{min-width:0;display:grid;gap:3px}.incoming-file strong{font-size:13px;overflow-wrap:anywhere}.incoming-file span{font-size:11px}.warning{font-size:12px;color:#111;background:var(--g100);padding:9px 10px;border-radius:6px}.dialog-actions{display:flex;justify-content:flex-end;gap:8px;margin-top:22px}.toast-region{position:fixed;bottom:20px;left:50%;transform:translateX(-50%);z-index:20;display:grid;gap:8px;width:min(90vw,360px)}.toast{background:#111;color:#fff;border-radius:8px;padding:12px 15px;font-size:12px;box-shadow:var(--shadow-md)}.toast.error{outline:1px solid #111;background:#fff;color:#111}.mode-badge{display:inline-block;border:1px solid var(--g300);padding:2px 5px;border-radius:4px;font-size:10px;margin-left:5px}
@media(max-width:767px){.topbar{height:auto;min-height:68px;padding:14px 18px;align-items:flex-start;flex-direction:column;gap:10px}.device-self{flex-wrap:wrap}.shell{padding:0 18px}.intro{padding:38px 0 28px;display:block}.intro h1{letter-spacing:-2px}.intro-note{margin-top:24px;max-width:none}.share-box{padding:15px;margin-bottom:34px}.qr-box{width:86px;height:86px}.qr-box canvas,.qr-box img{width:82px;height:82px}.device-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.device-card{padding:12px;min-height:122px}.section-head h2{font-size:21px}footer{padding:18px;flex-direction:column}.transfer-row{padding:12px;grid-template-columns:minmax(0,1fr) auto}.transfer-status{font-size:11px}}
@media(max-width:479px){.device-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.share-box{align-items:flex-start}.url-row{align-items:stretch;flex-direction:column}.url-row .button{width:100%}.qr-box{display:none}.intro h1{font-size:43px}.dialog{position:absolute;bottom:0;left:0;right:0;width:100%;border-radius:14px 14px 0 0;padding:24px 20px calc(24px + env(safe-area-inset-bottom))}.dialog-actions .button{flex:1}.backdrop{padding:0;align-items:end}.section-head{align-items:center}.connection-label{max-width:110px;text-align:right}.tips{flex-direction:column;align-items:center}.tips span{width:100%;max-width:280px}}
@media(min-width:768px) and (max-width:1199px){.device-grid{grid-template-columns:repeat(4,minmax(0,1fr))}}
@media(min-width:1200px){.device-grid{grid-template-columns:repeat(4,minmax(0,1fr))}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{transition:none!important;scroll-behavior:auto!important}}

.offline-panel{border:1px solid var(--border);border-radius:var(--radius);padding:20px;margin:0 0 38px;box-shadow:var(--shadow-sm)}.offline-intro{font-size:13px;color:var(--g700);max-width:760px;margin:0 0 16px}.offline-actions{display:flex;gap:8px;align-items:center;flex-wrap:wrap;margin:12px 0}.offline-label{display:block;font-size:12px;font-weight:750;margin:16px 0 7px}.offline-code{display:block;width:100%;resize:vertical;border:1px solid var(--border);border-radius:8px;padding:11px;font:11px/1.45 var(--mono);background:var(--g50);overflow-wrap:anywhere}.offline-code:focus{outline:2px solid #111;outline-offset:2px}.offline-actions .connection-label{margin-left:auto}@media(max-width:479px){.offline-panel{padding:15px}.offline-actions .button{width:100%}.offline-actions .connection-label{margin:0}}

/* Pairing controls */
.devices-head>div:first-child{min-width:0}.devices-head .connection-label{display:block;margin-top:6px;max-width:none;text-align:left}.pair-actions{display:flex;gap:8px;align-items:center;flex:none}.pair-actions .button{white-space:nowrap}.device-connect-label{font-size:11px;font-weight:750;margin-top:5px;color:#111}.pair-qr-panel{border:1px solid var(--border);border-radius:var(--radius);padding:16px;margin:0 0 18px;display:flex;align-items:center;justify-content:space-between;gap:16px}.pair-qr-content{display:flex;align-items:center;gap:18px;min-width:0}.pair-qr-content h3{font-size:16px;margin:0 0 5px}.pair-qr-content p{font-size:12px;color:var(--g700);margin:0;max-width:360px}.pair-qr-image{width:132px;height:132px;display:grid;place-items:center;flex:none}.pair-qr-image img{width:128px;height:128px;image-rendering:pixelated}.device-card:focus-visible,.button:focus-visible{outline:2px solid #111;outline-offset:3px}@media(max-width:479px){.devices-head{align-items:flex-end}.pair-actions{gap:6px}.pair-actions .button{padding:0 9px;min-height:40px;font-size:11px}.pair-qr-panel{align-items:flex-start;flex-direction:column}.pair-qr-content{width:100%;align-items:flex-start}.pair-qr-image{width:100px;height:100px}.pair-qr-image img{width:96px;height:96px}.pair-qr-panel>button{width:100%}}

/* Icon sizing and QR display */
[data-lucide],.device-icon svg,.brand-mark svg,.lock-icon svg,.drop-symbol svg,.empty-icon svg,.file-icon svg{width:1.25em;height:1.25em;stroke-width:1.8;vertical-align:middle}.brand-mark,.device-icon,.lock-icon,.drop-symbol,.empty-icon,.file-icon{display:inline-flex;align-items:center;justify-content:center}.pair-qr-image img,.pair-qr-image canvas{display:block;width:min(220px,100%);height:auto;margin:0 auto;image-rendering:pixelated}.pair-qr-panel[hidden]{display:none!important}

/* Interaction and responsive safeguards */
button { cursor: pointer; touch-action: manipulation; }
button:disabled { cursor: not-allowed; opacity: .55; }
#fileInput { position: fixed; left: -10000px; width: 1px; height: 1px; opacity: 0; }
.pair-actions { display:flex; flex-wrap:wrap; gap:.6rem; }
@media(max-width:560px){ .devices-head{display:flex;flex-direction:column;align-items:stretch;} .pair-actions{display:grid;grid-template-columns:1fr 1fr;} .pair-actions .button{min-width:0;width:100%;} }

/* Connection skeleton and recovery state */
.connection-skeleton{margin:0 0 18px;padding:18px;border:1px solid var(--border);border-radius:var(--radius);background:var(--g50)}
.skeleton-message{display:flex;align-items:center;gap:12px;margin-bottom:16px}
.skeleton-message strong{font-size:13px}.skeleton-message p{font-size:12px;color:var(--g700);margin:3px 0 0}
.skeleton-pulse{width:28px;height:28px;border-radius:9px;background:linear-gradient(100deg,#e7e7e7 20%,#f8f8f8 45%,#e7e7e7 70%);background-size:200% 100%;animation:skeleton-shimmer 1.4s ease-in-out infinite;flex:none}
.skeleton-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px}
.skeleton-card{min-height:132px;padding:16px;border:1px solid var(--border);border-radius:var(--radius);background:#fff;display:flex;flex-direction:column;align-items:flex-start;gap:11px}
.skeleton-icon,.skeleton-line{display:block;background:linear-gradient(100deg,#e8e8e8 20%,#f7f7f7 45%,#e8e8e8 70%);background-size:200% 100%;animation:skeleton-shimmer 1.4s ease-in-out infinite;border-radius:7px}
.skeleton-icon{width:34px;height:34px;border-radius:9px}.skeleton-line{height:9px;width:58%}.skeleton-line.wide{width:82%;height:11px}
.connection-issue{margin-top:16px;padding:14px;border:1px solid var(--g300);border-radius:10px;background:#fff}
.connection-issue strong{font-size:13px}.connection-issue p{font-size:12px;color:var(--g700);margin:4px 0 12px;max-width:560px}
@keyframes skeleton-shimmer{0%{background-position:100% 0}100%{background-position:-100% 0}}
footer{align-items:center;flex-wrap:wrap}.footer-links{display:flex;align-items:center;gap:16px;flex-wrap:wrap}.footer-links a{display:inline-flex;align-items:center;gap:6px;color:var(--g700);text-decoration:none;font-size:11px}.footer-links a:hover{text-decoration:underline;color:var(--text)}.footer-links svg{width:15px;height:15px}.footer-note{font-size:11px}
@media(max-width:767px){.skeleton-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.skeleton-card{min-height:112px;padding:12px}.footer-links{gap:14px}}
@media(prefers-reduced-motion:reduce){.skeleton-pulse,.skeleton-icon,.skeleton-line{animation:none}}

.brand-mark{overflow:hidden;background:transparent;border-radius:8px;flex:none}.brand-mark img{display:block;width:100%;height:100%;object-fit:contain}


/* Cross-device responsive layout hardening */
html { width:100%; overflow-x:clip; -webkit-text-size-adjust:100%; }
body { min-width:320px; overflow-wrap:anywhere; }
img, video, canvas, svg { max-width:100%; }
.shell { width:100%; }
.brand { min-width:0; flex-shrink:0; white-space:nowrap; }
.brand > span:last-child { line-height:1.1; }
.brand-mark { width:32px; height:32px; padding:0; }
.brand-mark img { width:100%; height:100%; object-fit:contain; }
.intro h1 { overflow-wrap:normal; word-break:normal; }
.share-box > *, .share-copy, .url-row, .devices-head > *, .transfer-row > *, .transfer-main { min-width:0; }
#shareUrl { overflow-wrap:anywhere; word-break:break-word; }
.device-grid { grid-template-columns:repeat(4,minmax(0,1fr)); }
.device-name, .device-type, .device-connect-label { max-width:100%; overflow-wrap:anywhere; }
.pair-qr-image { min-width:0; max-width:100%; }
.pair-qr-image img, .pair-qr-image canvas { max-width:100%; height:auto; }
button, .button { max-width:100%; }
#qrCameraInput { position:fixed; left:-10000px; width:1px; height:1px; opacity:0; }
@media (max-width: 760px) {
  .topbar { height:auto; min-height:64px; padding:12px 18px; gap:12px; }
  .shell { padding-left:18px; padding-right:18px; }
  .intro { padding:36px 0 28px; gap:18px; align-items:flex-start; flex-direction:column; }
  .intro h1 { font-size:clamp(34px,8.5vw,48px); letter-spacing:-1.8px; line-height:1.05; }
  .lead { font-size:15px; }
  .intro-note { max-width:none; }
  .share-box { padding:16px; gap:14px; margin-bottom:28px; }
  .qr-box { width:92px; height:92px; }
  .qr-box canvas, .qr-box img { width:88px; height:88px; }
  .device-grid { grid-template-columns:repeat(2,minmax(0,1fr)); }
  .device-card { min-height:120px; padding:13px; }
  .section-head h2 { font-size:21px; }
  .file-drop-zone { padding:24px 14px; margin-bottom:28px; }
  .transfer-row { gap:12px; }
}
@media (max-width: 520px) {
  .topbar { padding:11px 14px; align-items:center; }
  .brand { gap:7px; font-size:16px; }
  .brand-mark { width:28px; height:28px; }
  .device-self { gap:5px; font-size:11px; }
  .device-self .muted { display:none; }
  .name-chip { padding:6px 8px; min-height:34px; font-size:11px; max-width:48vw; }
  .shell { padding-left:14px; padding-right:14px; }
  .intro { padding:30px 0 24px; }
  .intro h1 { font-size:clamp(32px,9vw,42px); letter-spacing:-1.5px; }
  .lead { margin-top:13px; font-size:14px; }
  .share-box { align-items:flex-start; flex-direction:column; padding:14px; gap:12px; }
  .share-copy { width:100%; }
  .url-row { align-items:stretch; flex-direction:column; }
  .url-row .button { width:100%; }
  .qr-box { align-self:center; width:116px; height:116px; }
  .qr-box canvas, .qr-box img { width:112px; height:112px; }
  .device-grid { grid-template-columns:minmax(0,1fr); gap:9px; }
  .device-card { min-height:unset; display:grid; grid-template-columns:40px minmax(0,1fr); grid-template-rows:auto auto auto; column-gap:10px; align-items:center; padding:12px; }
  .device-icon { grid-row:1 / span 3; }
  .device-name { font-size:14px; }
  .device-type, .device-connect-label { margin:0; }
  .devices-head { align-items:stretch; }
  .pair-actions { grid-template-columns:minmax(0,1fr); width:100%; }
  .pair-actions .button { white-space:normal; min-height:42px; font-size:12px; }
  .pair-qr-panel { padding:13px; }
  .pair-qr-content { flex-direction:column; gap:12px; }
  .pair-qr-image { align-self:center; width:min(220px,100%); height:auto; min-height:100px; }
  .pair-qr-image img, .pair-qr-image canvas { width:min(220px,100%); height:auto; }
  .dialog { width:calc(100vw - 28px); max-width:none; padding:18px; }
  .dialog-actions { flex-wrap:wrap; }
  .dialog-actions .button { flex:1 1 120px; }
  .transfer-row { grid-template-columns:minmax(0,1fr); }
  .transfer-status { text-align:left; }
  .footer-links { flex-wrap:wrap; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior:auto !important; animation-duration:.01ms !important; animation-iteration-count:1 !important; transition-duration:.01ms !important; }
}

/* Final compact header alignment: brand left, device controls right. */
.topbar {
  width: 100%;
  min-height: 60px;
  height: auto;
  padding: 10px max(14px, calc((100vw - 912px) / 2));
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.brand {
  margin-right: auto;
  flex: 0 1 auto;
  min-width: 0;
}
.device-self {
  margin-left: auto;
  flex: 0 0 auto;
  justify-content: flex-end;
  min-width: 0;
}
.name-chip {
  max-width: min(42vw, 230px);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.brand-mark {
  width: 30px;
  height: 30px;
}
@media (max-width: 520px) {
  .topbar {
    min-height: 54px;
    padding: 8px 12px;
    gap: 8px;
  }
  .brand {
    gap: 7px;
    font-size: 15px;
  }
  .brand-mark {
    width: 27px;
    height: 27px;
  }
  .device-self {
    gap: 5px;
  }
  .name-chip {
    max-width: 44vw;
    min-height: 32px;
    padding: 5px 7px;
    font-size: 11px;
  }
}
@media (max-width: 360px) {
  .brand { font-size: 14px; gap: 5px; }
  .brand-mark { width: 24px; height: 24px; }
  .name-chip { max-width: 40vw; }
}