:root{
  --yellow:#ffe600; --blue:#3483fa; --success:#00a650; --danger:#f23d4f;
  --text:#333; --text2:#666; --muted:#999;
  --bg:#ededed; --surface:#fff; --border:#e6e6e6;
  --warnBg:#fff8e6; --warnBd:#f5d479; --warnTx:#7a5c00;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;background:var(--bg);color:var(--text);font-size:14px;line-height:1.4}
a{color:var(--blue);text-decoration:none}
.frame{max-width:420px;margin:0 auto;min-height:100vh;background:var(--bg);display:flex;flex-direction:column}

/* Header (Mercado Livre yellow) */
.appbar{background:var(--yellow);color:#000;display:flex;align-items:center;padding:10px 8px;position:relative;min-height:48px}
.appbar .back{background:none;border:0;color:#000;font-size:22px;cursor:pointer;padding:6px 10px;line-height:1}
.appbar .title{position:absolute;left:0;right:0;text-align:center;font-weight:600;font-size:16px;pointer-events:none}

/* Layout */
.main{flex:1;overflow-y:auto;padding-bottom:24px}
.card{background:var(--surface);padding:20px}
.gap{height:8px}
h1,h2,h3{margin:0}
h3{font-size:18px;font-weight:700;color:var(--text)}
.muted{color:var(--text2);font-size:13px}
.kicker{font-size:12px;font-weight:700;color:var(--blue);text-transform:uppercase;letter-spacing:.5px;margin-bottom:8px}
.lbl{font-size:12px;font-weight:700;color:var(--muted);letter-spacing:.05em;text-transform:uppercase;margin-bottom:6px;display:block}

/* Form fields */
.field{margin-bottom:14px}
.field label{display:block;font-size:12px;color:var(--text2);margin-bottom:4px;font-weight:600}
.input,select,textarea{width:100%;padding:11px 12px;border:1px solid #c5c5c5;border-radius:6px;font-size:14px;font-family:inherit;background:#fff;color:var(--text)}
.input:focus,select:focus,textarea:focus{outline:none;border-color:var(--blue);box-shadow:0 0 0 2px rgba(52,131,250,.15)}
.help{font-size:12px;color:var(--text2);margin-top:4px}
.help.err{color:#c62828}
.row2{display:flex;gap:8px}
.row2 .field{flex:1}
.row2 .small{flex:0 0 110px}
.checkrow{display:flex;align-items:flex-start;gap:8px;margin:10px 0}
.checkrow input{margin-top:3px}
.checkrow label{font-size:13px;color:var(--text2)}

/* Buttons */
.btn{display:block;width:100%;text-align:center;padding:13px;border-radius:8px;font-weight:700;font-size:15px;cursor:pointer;border:0;font-family:inherit;text-decoration:none}
.btn-primary{background:var(--blue);color:#fff}
.btn-success{background:var(--success);color:#fff}
.btn-ghost{background:transparent;color:var(--blue)}
.btn:active{opacity:.9}
.btn[disabled]{opacity:.5;pointer-events:none}

/* Amount box */
.amountBox{background:#e6f8ef;border-radius:8px;padding:14px;display:flex;justify-content:space-between;align-items:center}
.amountBox .l{font-size:14px;font-weight:600}
.amountBox .v{font-size:22px;font-weight:800;color:var(--success)}

/* Row list */
.kv{display:flex;justify-content:space-between;padding:6px 0;font-size:14px}
.kv .k{color:var(--text2)}
.kv .v{color:var(--text);font-weight:500;text-align:right;max-width:60%}
.kv.bold .v{font-weight:700}
.divider{height:1px;background:var(--border);margin:12px 0}

/* Slider */
.slider{-webkit-appearance:none;appearance:none;width:100%;height:4px;background:#e0e0e0;border-radius:2px;outline:none;margin:8px 0}
.slider::-webkit-slider-thumb{-webkit-appearance:none;appearance:none;width:20px;height:20px;border-radius:50%;background:var(--blue);cursor:pointer;border:0}
.slider::-moz-range-thumb{width:20px;height:20px;border-radius:50%;background:var(--blue);cursor:pointer;border:0}

/* Tabs */
.tabs{display:flex;border-bottom:1px solid var(--border);background:#fff}
.tabs button{flex:1;background:none;border:0;padding:16px 8px;font-weight:700;font-size:14px;color:var(--text2);cursor:pointer;border-bottom:2px solid transparent;font-family:inherit}
.tabs button.active{color:var(--blue);border-bottom-color:var(--blue)}

/* PIX */
.qrWrap{display:flex;justify-content:center;background:#fff;padding:16px;margin-bottom:12px;border:1px solid var(--border);border-radius:8px}
.qrWrap img{width:220px;height:220px}
textarea.pix{width:100%;font-family:ui-monospace,Menlo,Consolas,monospace;font-size:12px;padding:10px;border:1px solid var(--border);border-radius:6px;resize:none;height:84px;background:#fafafa;color:#111}
.help-block{background:var(--bg);border-radius:8px;padding:12px;margin-top:14px;font-size:12px;color:#374151;line-height:1.5}
.status{display:flex;align-items:center;justify-content:center;gap:10px;background:var(--warnBg);border:1px solid var(--warnBd);border-radius:8px;padding:12px;margin-top:14px;color:var(--warnTx);font-size:13px;font-weight:600}
.spinner{width:18px;height:18px;border:3px solid #e3c97a;border-top-color:#b8860b;border-radius:50%;animation:spin 1s linear infinite}
.spinner.big{width:28px;height:28px;border-width:4px;border-color:#cfd5db;border-top-color:var(--blue)}
@keyframes spin{to{transform:rotate(360deg)}}
.err{background:#fee2e2;color:#991b1b;border:1px solid #fecaca;border-radius:8px;padding:12px;font-size:13px;margin-bottom:12px}
.loading{display:flex;flex-direction:column;align-items:center;gap:10px;padding:30px 0;color:var(--text2);font-size:13px}

/* Success */
.check{width:84px;height:84px;border-radius:50%;background:#e6f8ef;display:flex;align-items:center;justify-content:center;margin:8px auto 16px}
.check svg{width:46px;height:46px;color:var(--success)}
.center{text-align:center}

/* Footer */
.footer{padding:16px 20px;font-size:11px;color:var(--muted);line-height:1.5}
.footer .copy{color:var(--text);font-size:12px;margin-bottom:4px}
.footnote{padding:14px 18px;font-size:12px;color:var(--muted)}