:root{--wa-dark:#075e54;--wa-teal:#008069;--wa-green:#25d366;--out:#d9fdd3;--in:#fff;--chat:#efeae2;--ink:#111b21;--mut:#667781;--tick:#53bdeb}
*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%}
body{font:400 15px/1.45 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;color:var(--ink);background:#f0f2f5;display:flex;flex-direction:column;-webkit-font-smoothing:antialiased}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
:focus-visible{outline:3px solid #0071e3;outline-offset:2px;border-radius:6px}
.demo-banner{background:#fff4ce;color:#5c4400;font-size:.8rem;text-align:center;padding:.45rem .8rem;border-bottom:1px solid #f1dd8f;flex:none}
.stage{flex:1;display:flex;min-height:0}
.intro{display:none}
.phone{flex:1;display:flex;flex-direction:column;min-height:0;background:var(--chat);width:100%}
.wa-head{background:var(--wa-teal);color:#fff;display:flex;align-items:center;gap:.7rem;padding:.55rem .8rem;flex:none}
.avatar{width:40px;height:40px;border-radius:50%;background:#fff;display:grid;place-items:center;font-size:1.3rem;flex:none}
.who{flex:1;min-width:0}
.name{font-weight:600;font-size:1rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.verified{display:inline-grid;place-items:center;width:15px;height:15px;border-radius:50%;background:var(--wa-green);color:#fff;font-size:.6rem;vertical-align:1px;margin-left:2px}
.status{font-size:.78rem;opacity:.9;min-height:1.1em}
.icon-btn{background:none;border:0;color:#fff;font-size:1.35rem;width:40px;height:40px;border-radius:50%;cursor:pointer}
.icon-btn:hover{background:rgba(255,255,255,.12)}
.chat{flex:1;overflow-y:auto;padding:.8rem .7rem 1rem;display:flex;flex-direction:column;gap:.25rem;
  background-color:var(--chat);
  background-image:radial-gradient(rgba(0,0,0,.035) 1.2px,transparent 1.3px),radial-gradient(rgba(0,0,0,.025) 1.2px,transparent 1.3px);
  background-size:26px 26px,26px 26px;background-position:0 0,13px 13px;scroll-behavior:smooth}
.day-chip,.sys-chip{align-self:center;background:#fff;color:var(--mut);font-size:.74rem;padding:.3rem .7rem;border-radius:8px;box-shadow:0 1px .5px rgba(0,0,0,.13);margin:.25rem 0;text-align:center;max-width:90%}
.sys-chip{background:#ffeecd;color:#54656f}
.row{display:flex;flex-direction:column;max-width:85%;animation:pop .22s ease-out}
.row.in{align-self:flex-start}
.row.out{align-self:flex-end;align-items:flex-end}
@keyframes pop{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
.bubble{position:relative;padding:.4rem .55rem .25rem .6rem;border-radius:8px;box-shadow:0 1px .5px rgba(0,0,0,.13);white-space:pre-line;word-wrap:break-word}
.in .bubble{background:var(--in);border-top-left-radius:0}
.out .bubble{background:var(--out);border-top-right-radius:0}
.row.cont .bubble{border-radius:8px}
.bubble .meta{float:right;font-size:.68rem;color:var(--mut);margin:.35rem 0 -.1rem .6rem;line-height:1;white-space:nowrap}
.out .meta .ticks{color:var(--tick);margin-left:2px}
.bubble .agent{display:block;font-size:.78rem;font-weight:600;color:#c2410c;margin-bottom:.1rem}
.bubble b{font-weight:600}
.bubble .tag{display:inline-block;font-size:.68rem;font-weight:600;background:#fff4ce;color:#5c4400;border-radius:4px;padding:0 .35rem;margin-left:.2rem;vertical-align:1px}
.opts{display:flex;flex-direction:column;gap:3px;margin-top:3px;width:100%;min-width:230px}
.opts.grid{display:grid;grid-template-columns:repeat(2,1fr)}
.opt{background:#fff;color:var(--wa-teal);border:0;border-radius:8px;padding:.6rem .7rem;font:500 .92rem/1.2 inherit;cursor:pointer;box-shadow:0 1px .5px rgba(0,0,0,.13);text-align:center;transition:background .15s}
.opt:hover:not(:disabled){background:#f5f6f6}
.opt:disabled{color:#9aa6ad;cursor:default}
.opt.picked{color:var(--wa-teal);background:#e7f6f2}
.typing{display:flex;gap:4px;padding:.65rem .8rem}
.typing span{width:7px;height:7px;border-radius:50%;background:#9aa6ad;animation:blink 1.2s infinite}
.typing span:nth-child(2){animation-delay:.2s}.typing span:nth-child(3){animation-delay:.4s}
@keyframes blink{0%,60%,100%{opacity:.3;transform:translateY(0)}30%{opacity:1;transform:translateY(-3px)}}
.composer{display:flex;gap:.5rem;padding:.5rem .6rem calc(.5rem + env(safe-area-inset-bottom));background:#f0f2f5;flex:none}
.composer input{flex:1;min-width:0;border:0;border-radius:22px;padding:.7rem 1rem;font:inherit;font-size:16px;background:#fff;color:var(--ink)}
.composer input:focus{outline:2px solid var(--wa-teal);outline-offset:0}
.send{width:44px;height:44px;border-radius:50%;border:0;background:var(--wa-teal);color:#fff;display:grid;place-items:center;cursor:pointer;flex:none}
.send:hover{background:var(--wa-dark)}
.composer.hl input{box-shadow:0 0 0 2px var(--wa-green)}

@media (min-width:900px){
  body{background:linear-gradient(180deg,#f5f5f7,#e9edef)}
  .stage{align-items:center;justify-content:center;gap:4rem;padding:2rem 2rem}
  .intro{display:block;max-width:420px}
  .kicker{color:var(--wa-teal);font-weight:600;font-size:.9rem;margin-bottom:.6rem}
  .intro h1{font-size:2.6rem;line-height:1.05;letter-spacing:-.035em;color:#1d1d1f;margin-bottom:1rem}
  .intro p{color:#424245;font-size:1.05rem;margin-bottom:1rem}
  .bullets{list-style:none;margin:0 0 1.2rem}
  .bullets li{padding-left:1.6rem;position:relative;margin:.45rem 0;color:#1d1d1f}
  .bullets li::before{content:"✓";position:absolute;left:0;color:var(--wa-teal);font-weight:700}
  .intro .small{font-size:.9rem;color:#6e6e73}
  .back{display:inline-block;margin-top:.5rem;color:#0066cc;font-weight:500;text-decoration:none}
  .back:hover{text-decoration:underline}
  .phone{flex:none;width:390px;height:min(780px,calc(100vh - 7rem));border-radius:38px;overflow:hidden;border:10px solid #1d1d1f;box-shadow:0 30px 80px rgba(0,0,0,.25)}
}
@media (prefers-reduced-motion:reduce){*{animation:none!important;scroll-behavior:auto!important}}