:root{
  --ink:#0F172A;
  --muted:#5B6472;
  --purple:#4D3BD9;
  --purple-light:#698FF0;
  --green:#22C593;
  --green-dark:#1B9F72;
  --danger:#DC2626;
  --bg:#F8F9FE;
  --surface:#FFFFFF;
  --card-purple:#F8F7FE;
  --card-green:#F6FAF7;
  --border:#E6E8F5;
  --badge-bg:#EDEBFC;
  --shadow:0 1px 2px rgba(15,23,42,.04), 0 8px 24px rgba(15,23,42,.06);
  --radius-lg:20px;
  --radius-md:14px;
  --radius-sm:10px;
}
html[data-theme="dark"]{
  --ink:#EAEEFB;
  --muted:#9AA4BD;
  --bg:#0B1220;
  --surface:#111A2E;
  --card-purple:#141C31;
  --card-green:#111E1D;
  --border:#232B42;
  --badge-bg:#1D2440;
  --shadow:0 1px 2px rgba(0,0,0,.3), 0 8px 24px rgba(0,0,0,.35);
}
*{box-sizing:border-box}
body{
  margin:0;
  font-family:'Inter',system-ui,-apple-system,sans-serif;
  background:var(--bg);
  color:var(--ink);
  transition:background .2s ease,color .2s ease;
}
.wrap{max-width:1120px;margin:0 auto;padding:0 1.5rem}
a{color:inherit}

/* header */
.site-header{
  display:flex;align-items:center;justify-content:space-between;
  padding:1.1rem 1.5rem;max-width:1120px;margin:0 auto;
}
.brand{display:flex;align-items:center;gap:.5rem}
.brand-mark{height:32px;display:block}
.brand-word{font-weight:800;font-size:1.25rem;letter-spacing:-.01em}
.header-actions{display:flex;align-items:center;gap:.75rem}
.icon-btn{
  width:40px;height:40px;border-radius:999px;border:1px solid var(--border);
  background:var(--surface);cursor:pointer;font-size:1.05rem;
  display:flex;align-items:center;justify-content:center;
}
.lang-select{
  width:auto;padding:0 .6rem;font-weight:700;font-size:.78rem;letter-spacing:.02em;
  color:var(--ink);background:var(--surface);font-family:inherit;
}
.fa-sun{color:#fff}

/* buttons */
.btn{
  font-family:inherit;font-weight:700;font-size:.95rem;
  border:none;border-radius:var(--radius-sm);cursor:pointer;
  padding:.8rem 1.3rem;display:inline-flex;align-items:center;gap:.5rem;
  line-height:1.15;transition:transform .05s ease,opacity .15s ease;
}
.btn:active{transform:scale(.98)}
.btn:disabled{opacity:.5;cursor:not-allowed}
.btn-primary{background:var(--purple);color:#fff}
.btn-green{background:var(--green-dark);color:#fff}
.btn-outline{background:transparent;color:var(--ink);border:1px solid var(--border)}
.btn-danger{background:transparent;color:var(--danger);border:1px solid var(--danger)}
.btn-sub{display:block;font-weight:500;font-size:.78rem;opacity:.85}
.btn-block{width:100%;justify-content:center}

/* hero */
.hero{
  display:grid;grid-template-columns:1.1fr 1fr;gap:2.5rem;align-items:center;
  padding:2.5rem 0 3rem;
}
.badge{
  display:inline-flex;align-items:center;gap:.4rem;
  background:var(--badge-bg);color:var(--purple);font-weight:600;font-size:.8rem;
  padding:.4rem .8rem;border-radius:999px;margin-bottom:1.1rem;
}
.hero-meta-row{display:flex;align-items:center;gap:.65rem;flex-wrap:wrap;margin-bottom:1.1rem}
.hero-meta-row .badge{margin:0}
html[data-theme="dark"] .badge{color:var(--purple-light)}
.hero h1{font-size:2.5rem;line-height:1.15;margin:0 0 1rem;font-weight:800;letter-spacing:-.02em}
.grad-purple,.grad-green{
  background-clip:text;-webkit-background-clip:text;-webkit-text-fill-color:transparent;
}
.grad-purple{background-image:linear-gradient(90deg,var(--purple),var(--purple-light))}
.grad-green{background-image:linear-gradient(90deg,var(--green-dark),var(--green))}
.hero p.lead{color:var(--muted);font-size:1.05rem;line-height:1.6;margin:0 0 1.6rem;max-width:34rem}
.hero-ctas{display:flex;gap:.9rem;flex-wrap:wrap}

.hero-art{display:flex;justify-content:center}
.hero-art img{width:100%;max-width:480px;height:auto}

/* panels */
.panels{display:grid;grid-template-columns:1fr 1fr;gap:1.5rem;margin-bottom:1.75rem}
.panel{
  display:flex;flex-direction:column;
  border-radius:var(--radius-lg);padding:1.5rem;border:1px solid var(--border);
  box-shadow:var(--shadow);
}
#btnCreate{margin-top:auto}
.panel-purple{background:var(--card-purple)}
.panel-green{background:var(--card-green)}
.panel h2{margin:0 0 1.1rem;font-size:1.15rem}
.steps{list-style:none;margin:0 0 1.3rem;padding:0;display:flex;flex-direction:column;gap:.85rem}
.steps li{display:flex;gap:.75rem;align-items:flex-start}
.step-num{
  flex:none;width:26px;height:26px;border-radius:999px;
  display:flex;align-items:center;justify-content:center;
  font-weight:700;font-size:.8rem;color:#fff;
}
.panel-purple .step-num{background:var(--purple)}
.panel-green .step-num{background:var(--green-dark)}
.step-text b{display:block;font-size:.92rem}
.step-text span{color:var(--muted);font-size:.82rem}

.code-card{
  background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-md);
  padding:1.1rem;text-align:center;
}
/* :not([hidden]) so the hidden attribute (same specificity as a class,
   but author rules beat the UA default at a tie) actually hides this. */
.session-grid:not([hidden]){display:grid;grid-template-columns:1fr 1fr;gap:1.5rem;align-items:stretch}
.session-summary{text-align:center}
.code-card .label{font-size:.78rem;color:var(--muted);margin-bottom:.6rem}
#token{font-size:1.7rem;font-weight:800;letter-spacing:.2em}
#qrcode:not([hidden]){display:flex;justify-content:center;margin:.9rem 0}
/* qrcodejs draws to a <canvas>, then runs an async "does this browser
   support data-URI images" probe and — win or lose — sets its own inline
   display style on the canvas and the <img> fallback to switch between
   them. Racy either way (a moment where the img shows broken/empty, or
   the canvas gets display:none once the probe resolves). The canvas
   always has the real drawn content, so force it to always win. */
#qrcode canvas{display:block !important;border-radius:8px}
#qrcode img{display:none !important}
.status-row{font-size:.85rem;color:var(--muted);margin:.6rem 0}
#status{font-weight:700;color:var(--ink)}
/* Transfer summary: clear sections, with the code as the primary action. */
.session-summary{display:flex;flex-direction:column;gap:.85rem;text-align:left}
.session-summary > .label{text-align:center;margin:0 0 .1rem}
.session-row{
  display:flex;
  flex-direction:column;
  align-items:stretch;
  gap:.45rem;
  margin:0;
  padding:.8rem .9rem;
  border:1px solid var(--border);
  border-radius:var(--radius-md);
  background:color-mix(in srgb, var(--surface) 75%, var(--bg));
  min-width:0;
}
.session-row-label{
  width:auto;
  text-align:left;
  font-size:.68rem;
  line-height:1.3;
  text-transform:uppercase;
  letter-spacing:.07em;
  color:var(--muted);
  font-weight:700;
}
.session-row-value{display:flex;align-items:center;gap:.65rem;min-width:0}
.session-row-value > #token,
.session-row-value > #link{min-width:0}
.session-row-value > .btn{flex:0 0 auto}
.session-row #token{font-size:1rem;font-weight:800;letter-spacing:.14em}
.session-row #link{font-size:1rem;font-family:inherit;word-break:break-all;line-height:1.4;flex:1 1 auto}
.session-row-code .session-row-value{justify-content:space-between}
.session-row-link .session-row-value{justify-content:space-between}
.session-qr-row{align-items:center;text-align:center;padding:.8rem .9rem .95rem}
.session-qr-row .session-row-label{text-align:center}
.session-qr-row .session-row-value{justify-content:center}
.session-qr-row #qrcode:not([hidden]){margin:.1rem 0 0}
.session-row-status{flex-direction:row;align-items:center;justify-content:space-between;padding:.65rem .9rem}
.session-row-status .session-row-value{flex:1;justify-content:flex-end}
.session-row-close{padding:0;border:0;background:transparent}
.session-row-close .session-row-value{justify-content:flex-end}
@media (max-width:480px){
  .session-row-link .session-row-value{align-items:stretch;flex-direction:column}
  .session-row-link .session-row-value > .btn{align-self:flex-start}
}

.code-boxes{display:flex;gap:.5rem;justify-content:center;margin-bottom:1rem}
.code-boxes input{
  width:2.4rem;height:2.8rem;text-align:center;font-size:1.3rem;font-weight:700;
  border:1px solid var(--border);border-radius:var(--radius-sm);
  background:var(--surface);color:var(--ink);text-transform:uppercase;
}
.code-boxes input:focus{outline:2px solid var(--green-dark);outline-offset:1px}
.or-sep{text-align:center;color:var(--muted);font-size:.8rem;margin:.6rem 0}

/* transfer */
#transfer{
  border:1px solid var(--border);border-radius:var(--radius-lg);
  background:var(--surface);padding:1.5rem;margin-bottom:1.75rem;box-shadow:var(--shadow);
}
#transfer h2{margin:0 0 1rem;font-size:1.1rem}
textarea{
  width:100%;font-family:inherit;font-size:.95rem;padding:.7rem;
  border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--surface);color:var(--ink);
  resize:vertical;margin-bottom:.7rem;
}
#drop{margin:1rem 0}
progress{width:100%;margin:.6rem 0}
#received a{color:var(--purple)}

/* transfer: two boxes side by row */
.transfer-layout{display:flex;gap:1.25rem;align-items:stretch}
.transfer-box{flex:1;min-width:0;margin-bottom:0;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-md);padding:1.1rem;box-shadow:var(--shadow)}
.transfer-box-heading{display:flex;align-items:center;gap:.75rem;margin-bottom:.9rem}
.transfer-box-icon{width:42px;height:42px;border-radius:13px;display:grid;place-items:center;flex:none;font-size:1.05rem}
.chat-box-icon{background:var(--badge-bg);color:var(--purple)}
.file-box-icon{background:var(--card-green);color:var(--green-dark)}
.transfer-box-title{margin:0 0 .16rem;font-size:.98rem;font-weight:700;color:var(--ink)}
.transfer-box-hint{margin:0;color:var(--muted);font-size:.78rem;line-height:1.4}
.transfer-chat{display:flex;flex-direction:column;gap:.65rem;margin-bottom:.85rem;min-height:290px;max-height:380px;overflow-y:auto;padding:1rem;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius-md);scroll-behavior:smooth}
.chat-empty{margin:auto;color:var(--muted);font-size:.88rem;text-align:center}
.chat-line{display:flex;flex-direction:column;gap:.22rem;max-width:100%}
.chat-line-sent{align-self:flex-end;align-items:flex-end}
.chat-line-received{align-self:flex-start;align-items:flex-start}
.chat-msg{max-width:min(86%, 34rem);white-space:pre-wrap;padding:.68rem .9rem;border-radius:18px;font-size:.92rem;line-height:1.45;background:var(--surface);color:var(--ink);box-shadow:0 1px 2px rgba(0,0,0,.08)}
.chat-sent{background:var(--purple);color:#fff;border-bottom-right-radius:5px}
.chat-received{border:1px solid var(--border);border-bottom-left-radius:5px}
.chat-time{padding:0 .35rem;color:var(--muted);font-size:.68rem}
.chat-composer{display:flex;align-items:flex-end;gap:.65rem;padding:.45rem;border:1px solid var(--border);background:var(--surface);border-radius:16px}
.chat-composer textarea{flex:1;min-width:0;min-height:48px;max-height:150px;margin:0;padding:.7rem .75rem;border:0;background:transparent;resize:vertical}
.chat-composer textarea:focus{outline:none}
.chat-composer .btn{min-height:46px;white-space:nowrap}
.chat-composer .btn i{font-size:.9rem}
.file-drop{display:flex;flex-direction:column;align-items:center;gap:.55rem;min-height:245px;padding:1.5rem;border:2px dashed var(--border);border-radius:var(--radius-md);background:var(--bg);color:var(--muted);text-align:center;transition:border-color .15s,background .15s}
.file-drop.is-dragging{border-color:var(--purple);background:var(--badge-bg)}
.file-drop-icon{font-size:2rem;color:var(--purple)}
.file-drop strong{color:var(--ink);font-size:.95rem}
.file-drop-hint{font-size:.82rem}
.file-pick{display:inline-flex;align-items:center;justify-content:center;min-height:40px;padding:.55rem .95rem;border:1px solid var(--border);border-radius:10px;background:var(--surface);color:var(--ink);font-size:.85rem;font-weight:700;cursor:pointer}
.file-pick:hover{border-color:var(--purple)}
.file-drop input[type=file]{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;clip-path:inset(50%)}
.selected-file{max-width:100%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:.74rem}
.file-activity{display:flex;align-items:flex-start;gap:.8rem;padding:.9rem;margin:.85rem 0;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius-md)}
.file-activity[hidden]{display:none}
.file-activity-icon{width:38px;height:38px;border-radius:11px;background:var(--badge-bg);color:var(--purple);display:grid;place-items:center;flex:none}
.file-activity-content{flex:1;min-width:0}
.file-activity-heading{display:flex;justify-content:space-between;gap:.5rem;align-items:baseline}
.file-activity-heading strong{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:.85rem}
.file-activity-heading span,.file-activity-detail{color:var(--muted);font-size:.72rem}
.file-activity progress{width:100%;margin:.7rem 0 .35rem}
.file-activity-detail{display:block}
.received-files{display:flex;flex-direction:column;gap:.55rem;margin-top:.85rem}
.received-file{display:flex;align-items:center;gap:.6rem;padding:.7rem .8rem;border:1px solid var(--border);border-radius:12px;background:var(--surface);min-width:0}
.received-file > i{color:var(--green-dark);flex:none}
.received-file a{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:var(--purple);font-size:.82rem;font-weight:700}
.received-file .sent-file-name{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:.82rem}
.received-file span{margin-left:auto;color:var(--muted);font-size:.7rem;white-space:nowrap}
.sent-files-heading{margin:.9rem 0 -.35rem;font-size:.85rem}
.file-box progress{height:8px}

/* stack vertically on narrow screens */
@media (max-width: 780px){
  .transfer-layout{flex-direction:column}
  .transfer-chat{min-height:230px;max-height:340px}
}
@media (max-width:480px){
  .chat-composer{align-items:stretch}
  .chat-composer .btn{width:48px;min-width:48px;padding:.6rem;}
  .chat-composer .btn span{display:none}
  .received-file{flex-wrap:wrap}
  .received-file span{margin-left:1.55rem}
}

/* how it works */
.connection-stat{
  gap:.4rem;max-width:100%;white-space:normal;
}
.connection-stat strong{color:var(--ink);font-size:inherit;font-variant-numeric:tabular-nums}
.how{padding:2.5rem 0}
.how h2{font-size:1.4rem;margin:0 0 1.3rem;text-align:center}
.how-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1.25rem}
.how-card{
  display:flow-root;
  background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-md);
  padding:1.2rem;box-shadow:var(--shadow);
}
.how-icon{
  float:inline-start;
  width:38px;height:38px;border-radius:999px;background:var(--badge-bg);color:var(--purple);
  display:flex;align-items:center;justify-content:center;font-weight:700;
  margin-inline-end:.9rem;margin-bottom:.5rem;
}
html[data-theme="dark"] .how-icon{color:var(--purple-light)}
.how-card b{display:block;margin-bottom:.3rem;font-size:.95rem}
.how-card span{color:var(--muted);font-size:.85rem}

/* features */
.features{display:grid;grid-template-columns:repeat(4,1fr);gap:1.25rem;padding-bottom:2.5rem}
.feature{padding:0 .25rem}
.feature b{display:block;margin-bottom:.3rem;font-size:.9rem}
.feature span{color:var(--muted);font-size:.82rem}

/* activity console */
.console{
  text-align:left;border-radius:var(--radius-md);overflow:hidden;
  border:1px solid var(--border);display:flex;flex-direction:column;
  min-height:220px;
}
.console-bar{
  display:flex;align-items:center;gap:.55rem;background:#151B2C;color:#8B93A8;
  font-size:.72rem;font-weight:700;letter-spacing:.02em;text-transform:uppercase;
  padding:.55rem .8rem;flex:none;
}
.console-dots{display:flex;gap:.3rem}
.console-dots i{width:7px;height:7px;border-radius:50%;background:#333c54;display:block}
.log-panel{
  background:#0B0F1A;color:#8ee6ad;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;
  font-size:.76rem;line-height:1.55;flex:1;overflow-y:auto;
  padding:.75rem .85rem;white-space:pre-wrap;text-align:left;
}
.log-panel:empty::before{content:attr(data-empty-label);color:#4a5570}

footer{
  border-top:1px solid var(--border);
  display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:1rem;
}
footer.wrap{padding-top:2.5rem;padding-bottom:2.5rem}
.footer-brand{display:flex;align-items:center;gap:.5rem;font-weight:700}
.footer-brand img{height:22px}
footer .copy{color:var(--muted);font-size:.85rem}

@media (max-width:860px){
  .hero{grid-template-columns:1fr;padding-top:1.5rem}
  .hero-art{order:-1}
  .hero h1{font-size:2rem}
  .panels{grid-template-columns:1fr}
  .session-grid{grid-template-columns:1fr}
  .how-grid{grid-template-columns:1fr}
  .features{grid-template-columns:1fr 1fr}
}