:root{--bg:#f5f7fb;--card:#fff;--ink:#0f172a;--mut:#64748b;--line:#e5e9f2;--p:#4f46e5;--p2:#7c3aed;--soft:#eef2ff;--ok:#059669;--warn:#b45309;--warnbg:#fff7ed;--red:#dc2626}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:'Plus Jakarta Sans',system-ui,-apple-system,'Segoe UI',Roboto,sans-serif;background:var(--bg);color:var(--ink);-webkit-font-smoothing:antialiased;min-height:100vh}
a{color:inherit;text-decoration:none}
button,input{font:inherit;color:inherit}
[hidden]{display:none!important}

/* header */
.top{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:18px max(16px,4vw);background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:21px;letter-spacing:-.3px}
.logo .mk{width:36px;height:36px;border-radius:11px;background:linear-gradient(135deg,var(--p),var(--p2));display:grid;place-items:center;box-shadow:0 6px 14px -6px rgba(79,70,229,.7)}
.logo>span:last-child{color:var(--p)}
.nav{display:flex;gap:28px;font-weight:500;font-size:15px;color:var(--mut)}
.nav a:hover{color:var(--ink)}
.pill{background:var(--soft);color:var(--p);padding:8px 14px;border-radius:99px;font-size:13px;font-weight:600;white-space:nowrap}

/* hero */
.hero{text-align:center;padding:52px 16px 30px}
.hero h1{font-size:clamp(30px,4.6vw,46px);font-weight:800;letter-spacing:-1.2px;line-height:1.12}
.hero h1 em{font-style:normal;background:linear-gradient(90deg,var(--p),var(--p2));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p{color:var(--mut);font-size:17px;margin:12px auto 0;max-width:640px;line-height:1.55}
.badges{display:flex;flex-wrap:wrap;justify-content:center;gap:10px;margin-top:22px}
.badges span{background:#fff;border:1px solid var(--line);border-radius:99px;padding:8px 15px;font-size:13px;font-weight:600;color:#334155}

/* card */
.wrap{padding:8px 16px 56px}
.card{background:var(--card);border:1px solid var(--line);border-radius:24px;padding:30px;box-shadow:0 18px 40px -18px rgba(15,23,42,.18)}
.app{max-width:540px;margin:0 auto;scroll-margin-top:90px}
.tabs{display:flex;background:#f1f5f9;border-radius:13px;padding:4px;margin-bottom:24px}
.tabs button{flex:1;border:0;background:none;padding:10px;border-radius:10px;font-weight:600;font-size:14px;color:var(--mut);cursor:pointer;transition:.15s}
.tabs button.on{background:#fff;color:var(--ink);box-shadow:0 1px 3px rgba(0,0,0,.1)}
.head{margin-bottom:20px}
.step{font-size:12px;font-weight:700;color:var(--p);letter-spacing:1.2px;text-transform:uppercase}
.head h2{font-size:23px;margin:6px 0 4px;letter-spacing:-.3px}
.sub{color:var(--mut);font-size:14px}

/* drop */
.drop{display:block;border:2px dashed #c7d2fe;background:#f8f9ff;border-radius:18px;padding:28px 18px;text-align:center;cursor:pointer;transition:.15s}
.drop:hover,.drop.over{border-color:var(--p);background:var(--soft)}
.drop .ic{width:54px;height:54px;margin:0 auto 10px;border-radius:15px;background:var(--soft);display:grid;place-items:center;color:var(--p)}
.drop b{display:block;font-size:15px}
.drop small{display:block;font-size:13px;color:var(--mut);margin-top:4px}
.types{display:flex;gap:6px;justify-content:center;margin-top:12px;flex-wrap:wrap}
.types i{font-style:normal;font-size:11px;font-weight:700;padding:4px 9px;border-radius:6px;background:#fff;border:1px solid var(--line);color:#475569}

/* file row */
.file{display:flex;align-items:center;gap:12px;border:1px solid var(--line);border-radius:14px;padding:12px;margin-top:14px}
.file.mini{margin-top:16px;background:#f8fafc}
.file.bare{border:0;padding:0;margin:0}
.fmeta{flex:1;min-width:0}
.fmeta .n{font-weight:600;font-size:14px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.fmeta .s{font-size:12px;color:var(--mut);margin-top:2px}
.fi{flex:none;width:42px;height:42px;border-radius:11px;display:grid;place-items:center;font-size:11px;font-weight:800;background:#fee2e2;color:var(--red)}
.fi-zip{background:#fef3c7;color:#b45309}
.fi-img{background:#dbeafe;color:#2563eb}
.x{border:0;background:none;color:#94a3b8;font-size:16px;cursor:pointer;padding:6px 8px;border-radius:8px}
.x:hover{background:#f1f5f9;color:var(--ink)}

/* inputs */
.lbl{display:block;font-size:13px;font-weight:600;margin:18px 0 7px}
.inp{width:100%;border:1px solid var(--line);border-radius:12px;padding:13px 14px;font-size:15px;background:#fff;outline:none;transition:.15s}
.inp:focus{border-color:var(--p);box-shadow:0 0 0 4px #e0e7ff}
.msg{color:var(--red);font-size:13px;font-weight:500;min-height:0;margin-top:10px}
.msg:empty{display:none}

/* buttons */
.btn{display:flex;align-items:center;justify-content:center;gap:8px;width:100%;margin-top:18px;border:0;cursor:pointer;background:linear-gradient(135deg,var(--p),var(--p2));color:#fff;padding:14px;border-radius:12px;font-weight:700;font-size:15px;box-shadow:0 10px 22px -10px rgba(79,70,229,.7);transition:.15s}
.btn:hover{transform:translateY(-1px)}
.btn:disabled{opacity:.5;cursor:not-allowed;transform:none}
.btn.ghost{background:#fff;color:var(--ink);border:1px solid var(--line);box-shadow:none}
.btn.ghost:hover{background:#f8fafc}
.btn.ok{background:var(--ok);box-shadow:0 10px 22px -10px rgba(5,150,105,.7)}
.btn.sm{padding:10px;font-size:14px;margin-top:10px}
.btn.loading{pointer-events:none;opacity:.8}
.btn.loading::after{content:"";width:16px;height:16px;border:2px solid rgba(255,255,255,.5);border-top-color:#fff;border-radius:50%;animation:spin .7s linear infinite}
.actions{display:flex;gap:10px}
.actions .btn{margin-top:16px}
@keyframes spin{to{transform:rotate(360deg)}}

/* code view */
.okc{width:60px;height:60px;border-radius:50%;background:#d1fae5;color:var(--ok);display:grid;place-items:center;margin:0 auto 16px}
.okc.done{background:linear-gradient(135deg,#10b981,#059669);color:#fff;box-shadow:0 10px 24px -10px rgba(5,150,105,.8)}
.row-kv{background:#f8fafc;border:1px solid var(--line);border-radius:12px;padding:12px 14px;font-size:14px;display:flex;justify-content:space-between;gap:12px}
.row-kv span{color:var(--mut)}
.row-kv b{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.pin-l{text-align:center;margin-top:18px;font-size:12px;color:var(--mut);font-weight:700;letter-spacing:1px}
.pin{display:flex;gap:8px;justify-content:center;margin:12px 0 4px}
.pin span{width:52px;height:62px;border-radius:13px;background:var(--soft);border:1.5px solid #c7d2fe;display:grid;place-items:center;font-family:'JetBrains Mono',ui-monospace,monospace;font-size:28px;font-weight:700;color:var(--p)}
.share{display:flex;gap:8px;margin-top:14px}
.share>*{flex:1;display:flex;align-items:center;justify-content:center;gap:6px;padding:11px;border-radius:11px;border:1px solid var(--line);background:#fff;font-weight:600;font-size:13px;cursor:pointer;transition:.15s}
.share>*:hover{background:#f8fafc}
.share .wa{background:#ecfdf5;border-color:#a7f3d0;color:var(--ok)}
.reselect{margin-top:14px;padding:14px;border-radius:12px;background:var(--soft);border:1px solid #c7d2fe;font-size:13px;line-height:1.5}

/* status */
.status{display:flex;align-items:center;gap:10px;margin-top:16px;padding:12px 14px;border-radius:12px;font-size:13px;font-weight:600;line-height:1.4}
.status .dot{flex:none;width:9px;height:9px;border-radius:50%}
.status[data-s=waiting]{background:#f0fdf4;border:1px solid #bbf7d0;color:#166534}
.status[data-s=waiting] .dot{background:#22c55e;animation:pulse 1.6s infinite}
.status[data-s=connecting]{background:#fffbeb;border:1px solid #fde68a;color:#92400e}
.status[data-s=connecting] .dot{background:#f59e0b;animation:pulse 1.2s infinite}
.status[data-s=sending]{background:var(--soft);border:1px solid #c7d2fe;color:#3730a3}
.status[data-s=sending] .dot{background:var(--p);animation:pulse 1s infinite}
.status[data-s=done]{background:#ecfdf5;border:1px solid #a7f3d0;color:#065f46}
.status[data-s=done] .dot{background:var(--ok)}
.status[data-s=error]{background:#fef2f2;border:1px solid #fecaca;color:#991b1b}
.status[data-s=error] .dot{background:var(--red)}
.status.sm{margin-top:14px}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(34,197,94,.45)}70%{box-shadow:0 0 0 8px rgba(34,197,94,0)}100%{box-shadow:0 0 0 0 rgba(34,197,94,0)}}

/* progress */
.prog{margin-top:12px}
.bar{height:8px;background:var(--soft);border-radius:99px;margin:14px 0 6px;overflow:hidden}
.bar i{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--p),var(--p2));border-radius:99px;transition:width .2s}
.meta{display:flex;justify-content:space-between;font-size:12px;color:var(--mut)}

.warn{display:flex;gap:10px;background:var(--warnbg);border:1px solid #fed7aa;color:var(--warn);border-radius:12px;padding:12px 14px;font-size:13px;line-height:1.5;margin-top:14px}
.warn b{display:block;color:#9a3412}
.tiny{text-align:center;font-size:12px;color:var(--mut);margin-top:14px}
.notice{padding:12px 14px;border-radius:12px;font-size:13px;margin-bottom:16px}
.notice.err{background:#fef2f2;border:1px solid #fecaca;color:#991b1b}

/* receive */
.pinin{display:flex;gap:8px}
.pinin input{width:100%;min-width:0;height:54px;border-radius:12px;border:1px solid var(--line);text-align:center;font-family:'JetBrains Mono',ui-monospace,monospace;font-size:22px;font-weight:700;outline:none;transition:.15s}
.pinin input:focus{border-color:var(--p);box-shadow:0 0 0 4px #e0e7ff}
.recv{border:1px solid var(--line);border-radius:16px;padding:16px}
.recv .btn{margin-top:14px}
.preview{display:block;max-width:100%;max-height:260px;margin:14px auto 0;border-radius:12px;border:1px solid var(--line)}
.p2p{display:flex;align-items:center;justify-content:center;gap:8px;font-size:12px;color:var(--mut);margin-top:16px}

/* sections */
.how{max-width:1100px;margin:0 auto;padding:30px 16px 20px;text-align:center;scroll-margin-top:80px}
.how h2{font-size:28px;letter-spacing:-.5px;margin-bottom:22px}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;text-align:left}
.tile{background:#fff;border:1px solid var(--line);border-radius:20px;padding:24px}
.tile .num{display:grid;place-items:center;width:40px;height:40px;border-radius:12px;background:var(--soft);color:var(--p);font-weight:800;margin-bottom:12px}
.tile h3{font-size:17px;margin-bottom:6px}
.tile p{color:var(--mut);font-size:14px;line-height:1.55}
.foot{text-align:center;color:var(--mut);font-size:13px;padding:36px 16px 40px}

.toast{position:fixed;left:50%;bottom:24px;transform:translate(-50%,20px);background:var(--ink);color:#fff;padding:11px 18px;border-radius:12px;font-size:14px;font-weight:600;opacity:0;pointer-events:none;transition:.25s;z-index:50}
.toast.on{opacity:1;transform:translate(-50%,0)}

@media (max-width:820px){.nav{display:none}.grid3{grid-template-columns:1fr}}
@media (max-width:520px){
  .top{padding:14px 16px}.pill{display:none}
  .hero{padding:36px 16px 22px}.hero p{font-size:15px}
  .card{padding:22px 18px;border-radius:20px}
  .pin{gap:6px}.pin span{width:44px;height:54px;font-size:24px}
  .pinin{gap:6px}.pinin input{height:50px;font-size:20px}
  .share>*{font-size:12px;padding:10px 6px}
}

/* ---- v2: multi-file lists ---- */
.setupbar{background:#fef3c7;border-bottom:1px solid #fde68a;color:#92400e;text-align:center;padding:10px 16px;font-size:14px;font-weight:600}
.setupbar a{color:var(--p);text-decoration:underline}
.flist{margin-top:16px;border:1px solid var(--line);border-radius:14px;overflow:hidden}
.fhead{display:flex;justify-content:space-between;align-items:center;padding:10px 14px;background:#f8fafc;border-bottom:1px solid var(--line);font-size:13px;font-weight:700;color:#334155}
.link{border:0;background:none;color:var(--p);font-weight:600;font-size:13px;cursor:pointer}
.link:hover{text-decoration:underline}
.flist>div:last-child{max-height:340px;overflow-y:auto}
.frow{display:flex;align-items:center;gap:12px;padding:11px 14px;border-bottom:1px solid #f1f5f9}
.frow:last-child{border-bottom:0}
.frow .fi{width:38px;height:38px;border-radius:10px;font-size:10px}
.frow .fmeta .n{font-size:13.5px}
.fst{font-size:12px;font-weight:600;color:var(--mut);white-space:nowrap}
.fst.ok{color:var(--ok)}.fst.go{color:var(--p)}.fst.bad{color:var(--red)}
.mbar{height:4px;background:var(--soft);border-radius:99px;margin-top:6px;overflow:hidden}
.mbar i{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--p),var(--p2));transition:width .2s}
.dlb{flex:none;border:1px solid #a7f3d0;background:#ecfdf5;color:var(--ok);font-weight:700;font-size:12.5px;padding:8px 12px;border-radius:9px;cursor:pointer;white-space:nowrap}
.dlb:hover{background:#d1fae5}
.dlb:disabled{background:#f8fafc;border-color:var(--line);color:#94a3b8;cursor:not-allowed}
.status.first{margin-top:0}
#recvView>.bar{margin-top:14px}
@media (max-width:520px){.dlb span{display:none}.frow{gap:10px;padding:10px 12px}}
@media (max-width:520px){.frow .fst.ok{display:none}}