:root {
  --primary: #1E3A7B;
  --primary-hover: #162d62;
  --primary-light: #EEF2FA;
  --accent: #F5A800;
  --gray-50: #F8F9FA;
  --gray-100: #f3f4f6;
  --gray-200: #E4E7EE;
  --gray-400: #9ca3af;
  --gray-500: #6B7280;
  --gray-700: #3D3D3D;
  --gray-800: #1f2937;
  --amber-50: #FFF8E6;
  --amber-100: #fef3c7;
  --amber-500: #F5A800;
  --amber-600: #b8860b;
  --red-50: #FDECEA;
  --red-100: #fee2e2;
  --red-500: #C0392B;
  --shadow-md: 0 1px 4px rgba(0,0,0,.08), 0 4px 16px rgba(0,0,0,.06);
  --shadow-xl: 0 20px 40px rgba(0,0,0,.1);
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: 'Plus Jakarta Sans', sans-serif;
  background: var(--gray-50);
  min-height: 100vh;
  color: var(--gray-700);
  -webkit-font-smoothing: antialiased;
}

/* ── Mercante Header ── */
.mb-header {
  position: sticky; top: 0; z-index: 100;
  background: #fff; border-bottom: 1px solid var(--gray-200);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 24px; height: 64px;
}
.mb-logo img { height: 44px; width: auto; object-fit: contain; }
.mb-app-name {
  position: absolute; left: 50%; transform: translateX(-50%);
  font-size: 17px; font-weight: 700; color: var(--primary);
  white-space: nowrap;
}

/* ── Layout ── */
.container {
  width: 100%;
  max-width: 520px;
  margin: 48px auto;
  padding: 0 16px;
}

.card {
  background: #fff;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-xl);
  padding: 32px 28px;
  box-shadow: var(--shadow-xl);
  animation: slideUp 0.5s var(--ease) both;
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── Card Header ── */
.card-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 24px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--gray-200);
}

.header-icon {
  display: flex; align-items: center; justify-content: center;
  width: 44px; height: 44px;
  border-radius: var(--radius-md);
  background: var(--primary);
  color: #fff; flex-shrink: 0;
}

.card-header h1 {
  font-size: 18px; font-weight: 700;
  color: var(--gray-800); letter-spacing: -0.3px;
}

.subtitle { font-size: 13px; color: var(--gray-500); margin-top: 2px; }

/* ── Form ── */
.form-group { margin-bottom: 16px; }

.form-group label {
  display: block;
  font-size: 12px; font-weight: 600;
  color: var(--gray-500); letter-spacing: 0.3px;
  margin-bottom: 5px;
}

.form-group input,
.form-group select {
  width: 100%;
  padding: 10px 12px;
  font-size: 14px;
  font-family: 'Plus Jakarta Sans', sans-serif;
  color: var(--gray-700);
  background: var(--gray-50);
  border: 1.5px solid var(--gray-200);
  border-radius: var(--radius-sm);
  outline: none;
  transition: border-color .15s, box-shadow .15s;
}

.form-group input::placeholder { color: var(--gray-400); }

.form-group input:focus,
.form-group select:focus {
  border-color: var(--primary);
  background: #fff;
  box-shadow: 0 0 0 3px rgba(30,58,123,.1);
}

.form-group select {
  cursor: pointer; appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='%236b7280' viewBox='0 0 16 16'%3E%3Cpath d='M4.646 5.646a.5.5 0 0 1 .708 0L8 8.293l2.646-2.647a.5.5 0 0 1 .708.708l-3 3a.5.5 0 0 1-.708 0l-3-3a.5.5 0 0 1 0-.708z'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 12px center;
  padding-right: 36px;
}

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }

/* ── Warning ── */
.juros-warning {
  display: flex; align-items: flex-start; gap: 10px;
  background: var(--amber-50);
  border: 1px solid var(--amber-100);
  border-left: 3px solid var(--amber-500);
  border-radius: var(--radius-sm);
  padding: 11px 13px; margin-bottom: 16px;
  font-size: 13px; color: var(--amber-600); line-height: 1.45;
  animation: fadeIn .3s var(--ease);
}
.juros-warning svg { flex-shrink: 0; margin-top: 1px; color: var(--amber-500); }

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-4px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── Button ── */
.btn-submit {
  width: 100%; padding: 12px 18px;
  font-size: 14px; font-weight: 600;
  font-family: 'Plus Jakarta Sans', sans-serif;
  color: #fff; background: var(--primary);
  border: none; border-radius: var(--radius-sm);
  cursor: pointer; transition: background .15s, transform .1s;
}
.btn-submit:hover:not(:disabled) { background: var(--primary-hover); }
.btn-submit:active:not(:disabled) { transform: translateY(1px); }
.btn-submit:disabled { opacity: .7; cursor: not-allowed; }

.btn-text, .btn-loading { display: inline-flex; align-items: center; gap: 8px; }

/* ── Spinner ── */
.spinner {
  display: inline-block; width: 16px; height: 16px;
  border: 2px solid rgba(255,255,255,.3);
  border-top-color: #fff; border-radius: 50%;
  animation: spin .7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Result ── */
.resultado {
  margin-top: 20px; padding-top: 18px;
  border-top: 1px solid var(--gray-200);
  animation: slideIn .35s var(--ease);
}
@keyframes slideIn {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.resultado-header {
  display: flex; align-items: center; gap: 8px;
  font-size: 14px; font-weight: 600;
  color: var(--primary); margin-bottom: 10px;
}
.resultado-header svg { color: var(--primary); }

.resultado-link-box { display: flex; gap: 8px; }

.link-input {
  flex: 1; padding: 9px 12px; font-size: 13px;
  font-family: monospace; color: var(--gray-700);
  background: var(--primary-light);
  border: 1.5px solid rgba(30,58,123,.2);
  border-radius: var(--radius-sm); outline: none;
}

.btn-copiar {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 9px 14px; font-size: 13px; font-weight: 600;
  font-family: 'Plus Jakarta Sans', sans-serif;
  color: var(--primary);
  background: var(--primary-light);
  border: 1.5px solid rgba(30,58,123,.2);
  border-radius: var(--radius-sm);
  cursor: pointer; transition: all .15s; white-space: nowrap;
}
.btn-copiar:hover { background: #dce6f7; }
.btn-copiar.copied { color: #fff; background: var(--primary); border-color: var(--primary); }

/* ── Error ── */
.erro {
  display: flex; align-items: flex-start; gap: 10px;
  margin-top: 16px; padding: 12px 14px;
  background: var(--red-50);
  border: 1px solid var(--red-100);
  border-left: 3px solid var(--red-500);
  border-radius: var(--radius-sm);
  font-size: 13px; color: var(--red-500); line-height: 1.45;
  animation: fadeIn .3s var(--ease);
}
.erro svg { flex-shrink: 0; margin-top: 1px; }

/* ── Footer ── */
.footer {
  text-align: center; margin-top: 16px;
  font-size: 12px; color: var(--gray-400);
}
.footer strong { color: var(--gray-500); }

.hidden { display: none !important; }

@media (max-width: 520px) {
  .card { padding: 24px 18px; }
  .form-row { grid-template-columns: 1fr; gap: 0; }
  .card-header h1 { font-size: 16px; }
  .container { margin: 24px auto; }
}