:root{
  --text:#eef2f5;
  --muted:#9ca8b3;
  --page:#0d1117;
  --panel:#151a20;
  --surface:#10161e;
  --line:#2a333d;
  --line-2:#3d4854;
  --accent:#c86f32;
  --accent-2:#e08a45;
  --shadow:0 18px 45px rgba(0,0,0,.28);
}
*{box-sizing:border-box;margin:0;padding:0}
body{
  min-height:100vh;
  font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  background:
    linear-gradient(90deg,rgba(255,255,255,.025) 1px,transparent 1px),
    linear-gradient(rgba(255,255,255,.02) 1px,transparent 1px),
    var(--page);
  background-size:46px 46px;
  color:var(--text);
}
button,input,select{font:inherit}
.auth-shell{
  max-width:100%;
  width:min(980px,100%);
  min-height:100vh;
  margin:0 auto;
  padding:32px 18px;
  display:grid;
  grid-template-columns:1fr 420px;
  gap:18px;
  align-items:center;
}
.brand-panel,.auth-card{
  border:1px solid var(--line);
  border-radius:8px;
  background:rgba(21,26,32,.96);
  box-shadow:var(--shadow);
}
.brand-panel{width:100%;max-width:100%;min-width:0;min-height:520px;padding:34px;display:flex;flex-direction:column;justify-content:space-between;gap:26px;overflow:hidden}
.eyebrow{font-size:11px;font-weight:800;text-transform:uppercase;letter-spacing:.12em;color:var(--accent-2);margin-bottom:12px}
.brand-panel h1{max-width:560px;font-size:38px;line-height:1.05;margin-bottom:16px}
.brand-panel p:not(.eyebrow){max-width:560px;color:var(--muted);line-height:1.65;font-size:15px}
.demo-panel{width:100%;min-width:0;max-width:100%;border:1px solid var(--line);border-radius:8px;background:#10161e;overflow:hidden;box-shadow:inset 0 1px 0 rgba(255,255,255,.03)}
.demo-topline{min-height:46px;padding:12px 14px;display:flex;align-items:center;justify-content:space-between;gap:12px;border-bottom:1px solid var(--line)}
.demo-topline span{font-size:13px;font-weight:900;color:var(--text)}
.demo-topline small{font-size:12px;font-weight:800;color:var(--accent-2)}
#demo-canvas{display:block;width:100%;min-width:0;max-width:100%;height:230px}
.demo-meter{height:4px;background:#0d1117;overflow:hidden}
.demo-meter span{display:block;width:100%;height:100%;transform:scaleX(0);transform-origin:left;background:linear-gradient(90deg,#3fc9d6,var(--accent-2));will-change:transform}
.auth-card{padding:24px}
form{display:grid;gap:12px}
.form-head{display:flex;gap:12px;align-items:center;margin-bottom:8px}
.form-head i{display:grid;place-items:center;width:38px;height:38px;border:1px solid var(--line-2);border-radius:6px;background:#111821;color:var(--accent-2);font-size:22px}
.form-head h2{font-size:22px}
.form-head p{font-size:13px;color:var(--muted);margin-top:2px}
label{font-size:12px;font-weight:800;color:var(--muted)}
input,select{width:100%;min-height:44px;padding:10px 12px;border:1px solid var(--line-2);border-radius:6px;background:#0f151d;color:var(--text);outline:none;transition:border-color .15s,box-shadow .15s}
input::placeholder{color:#596572}
select{appearance:none;background-image:linear-gradient(45deg,transparent 50%,#9ca8b3 50%),linear-gradient(135deg,#9ca8b3 50%,transparent 50%);background-position:calc(100% - 18px) 19px,calc(100% - 12px) 19px;background-size:6px 6px,6px 6px;background-repeat:no-repeat;padding-right:34px}
select:invalid{color:#596572}
input:focus,select:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(200,111,50,.16)}
/* Seletor de país do WhatsApp (intl-tel-input) — tema escuro */
.iti{width:100%;display:block}
.iti__selected-flag{background:rgba(255,255,255,.04);border-radius:6px 0 0 6px}
.iti--separate-dial-code .iti__selected-dial-code{color:var(--text)}
.iti__country-list{background:#0f151d;border:1px solid var(--line-2);color:var(--text);box-shadow:0 8px 24px rgba(0,0,0,.5)}
.iti__country.iti__highlight{background:rgba(200,111,50,.18)}
.iti__country:hover{background:rgba(255,255,255,.06)}
.iti__divider{border-color:var(--line-2)}
.iti__dial-code{color:var(--muted)}
button{min-height:44px;display:inline-flex;align-items:center;justify-content:center;gap:8px;border-radius:6px;font-size:14px;font-weight:800;cursor:pointer;transition:background .15s,border-color .15s,color .15s}
.btn-primary{border:1px solid var(--accent);background:var(--accent);color:#11151b}
.btn-primary:hover{background:var(--accent-2);border-color:var(--accent-2)}
.btn-demo{border:1px solid rgba(224,138,69,.7);background:rgba(200,111,50,.12);color:#f3d2b7}
.btn-demo:hover{background:rgba(200,111,50,.2);border-color:var(--accent-2)}
.btn-ghost{border:1px solid var(--line-2);background:#10161e;color:var(--muted)}
.btn-ghost:hover{background:#151d27;color:var(--text)}
.btn-google{border:1px solid var(--line-2);background:#f4f6f8;color:#11151b}
.btn-google img{width:20px;height:20px}
a{color:var(--accent-2);font-size:13px;text-decoration:none;text-align:center;font-weight:700}
a:hover{text-decoration:underline}
@media (max-width:860px){
  .auth-shell{grid-template-columns:1fr;align-items:start;padding:18px 12px 30px}
  .brand-panel{min-height:auto;padding:24px}
  .brand-panel h1{font-size:30px}
  #demo-canvas{height:210px}
  .demo-topline{align-items:flex-start;flex-direction:column;gap:4px}
  .auth-card{padding:18px}
}