:root{
  --bg:#0d1117; --bg2:#151b24; --card:#1a222d; --line:#2a3644;
  --fg:#e6edf3; --fg2:#9aa7b4; --blue:#2f6bff; --blue2:#4d84ff;
  --green:#2ecc71; --red:#ff5a5f; --amber:#f5a524;
  --radius:16px;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  background:radial-gradient(1200px 700px at 15% -10%,#1b2a4a 0%,transparent 60%),
             radial-gradient(900px 600px at 110% 10%,#14342c 0%,transparent 55%),
             var(--bg);
  color:var(--fg);
  font:15px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei","PingFang SC",Roboto,Helvetica,Arial,sans-serif;
  min-height:100vh;display:flex;flex-direction:column;
}
.hidden{display:none !important}
.muted{color:var(--fg2);font-weight:400}

/* ---------- top bar ---------- */
.topbar{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:18px 28px;border-bottom:1px solid var(--line);
  background:rgba(13,17,23,.72);backdrop-filter:blur(10px);position:sticky;top:0;z-index:20;
}
.brand{display:flex;align-items:center;gap:12px}
.brand h1{font-size:17px;margin:0;letter-spacing:.3px}
.sub{margin:0;font-size:12px;color:var(--fg2)}
.top-actions{display:flex;align-items:center;gap:10px}
.badge{
  font-size:12px;padding:5px 11px;border-radius:999px;border:1px solid var(--line);
  color:var(--fg2);background:var(--bg2);white-space:nowrap;
}
.badge.ok{color:#8ff0b6;border-color:#255c3c;background:#10261a}
.badge.bad{color:#ffb3b5;border-color:#5c2528;background:#2a1214}

/* ---------- layout ---------- */
main{flex:1;width:100%;max-width:1080px;margin:0 auto;padding:34px 20px 60px}
.cards{display:grid;grid-template-columns:1fr 1fr;gap:20px}
@media (max-width:820px){.cards{grid-template-columns:1fr}main{padding:20px 14px 50px}}

.card{
  background:linear-gradient(180deg,rgba(255,255,255,.035),rgba(255,255,255,.012));
  border:1px solid var(--line);border-radius:var(--radius);padding:22px;
  box-shadow:0 18px 40px -28px #000;
}
.card-head{display:flex;align-items:center;gap:9px;margin-bottom:6px}
.card-head h2{font-size:16px;margin:0}
.dot{width:9px;height:9px;border-radius:50%;display:inline-block}
.dot-blue{background:var(--blue);box-shadow:0 0 12px var(--blue)}
.dot-green{background:var(--green);box-shadow:0 0 12px var(--green)}
.hint{color:var(--fg2);font-size:13px;margin:6px 0 16px}

/* ---------- controls ---------- */
button{font:inherit;cursor:pointer;border-radius:10px;border:1px solid transparent;transition:.15s}
button:active{transform:translateY(1px)}
button:disabled{opacity:.5;cursor:not-allowed;transform:none}
.primary{background:linear-gradient(180deg,var(--blue2),var(--blue));color:#fff;padding:10px 18px;font-weight:600;
  box-shadow:0 8px 22px -12px var(--blue)}
.primary:hover:not(:disabled){filter:brightness(1.08)}
.primary.big{width:100%;padding:14px;font-size:15px}
.ghost{background:transparent;border-color:var(--line);color:var(--fg2);padding:8px 13px}
.ghost:hover{color:var(--fg);border-color:#3d4c5e;background:rgba(255,255,255,.04)}
.ghost.small{padding:5px 10px;font-size:12px}
.ghost.danger:hover{color:#ffb3b5;border-color:#5c2528;background:#2a1214}

input[type=text],input[type=password]{
  width:100%;padding:11px 13px;border-radius:10px;border:1px solid var(--line);
  background:#0f151d;color:var(--fg);font:inherit;outline:none;
}
input[type=text]:focus,input[type=password]:focus{border-color:var(--blue);box-shadow:0 0 0 3px rgba(47,107,255,.16)}
.join-form{display:flex;gap:10px}
.join-form input{letter-spacing:1.5px;font-family:ui-monospace,SFMono-Regular,Consolas,monospace}

/* ---------- code box ---------- */
.code-box{margin-top:18px;border-top:1px dashed var(--line);padding-top:16px}
.code-row{display:flex;align-items:center;gap:12px}
.code{
  flex:1;font-family:ui-monospace,SFMono-Regular,Consolas,monospace;font-size:26px;letter-spacing:3px;
  color:#9fc0ff;background:#0f1726;border:1px solid #24406e;border-radius:12px;
  padding:14px 16px;text-align:center;user-select:all;word-break:break-all;
}
.code-sub{display:flex;justify-content:space-between;align-items:center;margin-top:12px;font-size:12px}
.link{color:var(--blue2);text-decoration:none}
.link:hover{text-decoration:underline}
.timer{color:var(--fg2);font-variant-numeric:tabular-nums}
.waiting{display:flex;align-items:center;gap:10px;margin-top:14px;color:var(--fg2);font-size:13px}
.spinner{
  width:15px;height:15px;border-radius:50%;border:2px solid #2b3a4d;border-top-color:var(--blue2);
  animation:spin .8s linear infinite;display:inline-block;flex:none;
}
@keyframes spin{to{transform:rotate(360deg)}}

.conn-status{
  margin-top:20px;padding:14px 16px;border-radius:12px;border:1px solid var(--line);
  background:var(--bg2);font-size:13px;color:var(--fg2);
}
.conn-status.bad{border-color:#5c2528;background:#2a1214;color:#ffb3b5}

/* ---------- transfer ---------- */
.transfer-head{display:flex;justify-content:space-between;align-items:flex-start;gap:16px;margin-bottom:18px}
.transfer-head h2{font-size:18px;margin:0}
.transfer-actions{display:flex;gap:10px;flex:none}
.dropzone{
  border:2px dashed #2f3f52;border-radius:var(--radius);padding:44px 20px;text-align:center;
  color:var(--fg2);transition:.18s;background:rgba(255,255,255,.012);margin-bottom:18px;
}
.dropzone.over{border-color:var(--blue);background:rgba(47,107,255,.09);color:var(--fg)}
.dropzone p{margin:6px 0}
.dz-icon{font-size:30px;opacity:.6}
.dz-sub{font-size:12px;opacity:.7}
.recv-hint{
  padding:40px 20px;text-align:center;color:var(--fg2);border:1px solid var(--line);
  border-radius:var(--radius);background:rgba(255,255,255,.012);margin-bottom:18px;
}

.file-list{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:10px}
.file-item{
  display:grid;grid-template-columns:34px 1fr auto;gap:12px;align-items:center;
  background:var(--card);border:1px solid var(--line);border-radius:12px;padding:12px 14px;
}
.file-item .fi-icon{font-size:20px;text-align:center}
.fi-name{font-size:14px;font-weight:600;word-break:break-all}
.fi-info{font-size:12px;color:var(--fg2);font-variant-numeric:tabular-nums}
.fi-bar{height:5px;border-radius:4px;background:#0f151d;overflow:hidden;margin-top:7px;border:1px solid #1d2836}
.fi-bar > i{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--blue),#6aa8ff);transition:width .18s}
.fi-bar.done > i{background:linear-gradient(90deg,#22a35a,var(--green))}
.fi-bar.err > i{background:var(--red)}
.fi-right{display:flex;flex-direction:column;align-items:flex-end;gap:6px;font-size:12px;color:var(--fg2)}
.fi-save{color:var(--blue2);text-decoration:none;font-weight:600}
.fi-save:hover{text-decoration:underline}

.stats{display:flex;gap:20px;margin-top:18px;font-size:13px;color:var(--fg2);
  font-variant-numeric:tabular-nums;border-top:1px solid var(--line);padding-top:14px}

.hidden-input{display:none}

/* ---------- footer ---------- */
.foot{display:flex;justify-content:center;align-items:center;gap:14px;padding:16px;border-top:1px solid var(--line);font-size:12px}

/* ---------- panels ---------- */
.log-panel,.settings-panel{
  position:fixed;inset:auto 0 0 0;max-height:56vh;background:#0b1017;border-top:1px solid var(--line);
  z-index:40;display:flex;flex-direction:column;box-shadow:0 -18px 40px -20px #000;
}
.log-head{display:flex;justify-content:space-between;align-items:center;padding:10px 16px;border-bottom:1px solid var(--line);font-size:13px}
#logText{margin:0;padding:12px 16px;overflow:auto;font:12px/1.55 ui-monospace,SFMono-Regular,Consolas,monospace;
  color:#9fb3c8;white-space:pre-wrap;word-break:break-all}
.settings-panel{inset:0;background:rgba(5,8,12,.75);backdrop-filter:blur(4px);align-items:center;justify-content:center;max-height:none}
.settings-inner{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:24px;
  width:min(560px,94vw);max-height:88vh;overflow:auto;
}
.settings-inner h3{margin:0 0 4px}
.settings-inner label{display:block;margin:14px 0;font-size:13px;color:var(--fg2)}
.settings-inner label input[type=text],.settings-inner label input[type=password]{margin-top:6px}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:12px}
label.check{display:flex;align-items:center;gap:8px}
label.check input{width:auto}
.settings-actions{display:flex;gap:10px;justify-content:flex-end;margin-top:20px}

/* ---------- modal ---------- */
.modal{position:fixed;inset:0;background:rgba(5,8,12,.78);display:flex;align-items:center;justify-content:center;z-index:90;padding:16px;backdrop-filter:blur(3px)}
.modal-box{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:24px;width:min(480px,94vw);max-height:86vh;overflow:auto}
.modal-box h3{margin:0 0 14px}
.accept-list{list-style:none;padding:0;margin:0 0 18px;font-size:13px;color:var(--fg2)}
.accept-list li{padding:7px 0;border-bottom:1px solid var(--line);word-break:break-all;display:flex;justify-content:space-between;gap:12px}
.modal-actions{display:flex;gap:10px;justify-content:flex-end}