/* =========================================================
   Solicitud de Factura — Hoja de estilos
   Paleta: blanco + azul | bordes redondeados | sombras suaves
   ========================================================= */

:root {
  --blue-900: #14235c;
  --blue-800: #1b2f6e;
  --blue-600: #2547a0;
  --blue-500: #3b63c9;
  --blue-100: #dbe4fb;
  --blue-50: #f2f5fd;
  --white: #ffffff;
  --gray-700: #374151;
  --gray-500: #6b7280;
  --gray-300: #d1d5db;
  --red-500: #ef4444;
  --green-600: #059669;
  --radius-lg: 18px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --shadow-soft: 0 10px 40px rgba(20, 35, 92, 0.12);
  --shadow-btn: 0 8px 20px rgba(27, 47, 110, 0.25);
}

* { box-sizing: border-box; }
body, h1, h2, h3, p, ul { margin: 0; }

body {
  font-family: 'Segoe UI', system-ui, -apple-system, Roboto, sans-serif;
  background: linear-gradient(160deg, var(--blue-50) 0%, #ffffff 55%, var(--blue-50) 100%);
  color: var(--gray-700);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 32px 16px;
  line-height: 1.5;
}

.wrapper { width: 100%; max-width: 640px; animation: fadeInUp .6s ease both; }

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(18px); }
  to { opacity: 1; transform: none; }
}

.card {
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft);
  padding: 40px 36px;
  position: relative;
  overflow: hidden;
}

/* Franja superior decorativa */
.card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0; height: 6px;
  background: linear-gradient(90deg, var(--blue-800), var(--blue-500));
}

.header { text-align: center; margin-bottom: 30px; }

.header .logo {
  max-width: 210px;
  width: 100%;
  height: auto;
  display: block;
  margin: 0 auto;
}

.header h1 { color: var(--blue-800); font-size: 1.6rem; margin-top: 8px; font-weight: 700; }
.header p { color: var(--gray-500); font-size: .95rem; margin-top: 8px; max-width: 440px; margin-inline: auto; }

form { margin-top: 8px; }

.field { margin-bottom: 20px; }
.field label { display: flex; flex-wrap: wrap; align-items: center; gap: 4px 6px; font-size: .88rem; font-weight: 600; color: var(--blue-800); margin-bottom: 6px; }
.field .opt { font-weight: 400; color: var(--gray-500); font-size: .78rem; }
.required { color: var(--red-500); }

.row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 560px) { .row { grid-template-columns: 1fr; } }

input[type=text], input[type=email], input[type=tel], input[type=date], input[type=number], select, textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1.5px solid var(--gray-300);
  border-radius: var(--radius-sm);
  font-size: .95rem;
  color: #111827;
  background: #fafbff;
  outline: none;
  transition: border-color .2s, box-shadow .2s, background .2s;
  font-family: inherit;
}

textarea { resize: vertical; min-height: 80px; }

input:focus, select:focus, textarea:focus {
  border-color: var(--blue-600);
  background: #fff;
  box-shadow: 0 0 0 4px rgba(37, 71, 160, .12);
}

.field.invalid input, .field.invalid select, .field.invalid textarea { border-color: var(--red-500); background: #fef2f2; }
.error-text { display: none; color: var(--red-500); font-size: .78rem; margin-top: 5px; }
.field.invalid .error-text { display: block; }

select {
  appearance: none;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20' fill='%231b2f6e'><path d='M5.5 7l4.5 5 4.5-5z'/></svg>");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 36px;
}

/* Zona de carga de archivos (drag & drop) */
.upload-box {
  border: 2px dashed var(--gray-300);
  border-radius: var(--radius-md);
  padding: 20px 14px;
  text-align: center;
  cursor: pointer;
  transition: all .2s;
  background: #fafbff;
  position: relative;
}

.upload-box:hover, .upload-box.dragover { border-color: var(--blue-600); background: var(--blue-50); }
.upload-box input[type=file] { position: absolute; inset: 0; opacity: 0; cursor: pointer; width: 100%; height: 100%; }
.upload-box .u-icon { font-size: 1.7rem; }
.upload-box p { font-size: .85rem; color: var(--gray-500); margin-top: 4px; }
.upload-box p strong { color: var(--blue-800); }
.file-name { font-size: .82rem; color: var(--green-600); font-weight: 600; margin-top: 6px; display: none; }
.hint { font-size: .76rem; color: #9ca3af; margin-top: 5px; }

/* Campo honeypot: oculto visualmente pero presente en el DOM para atrapar bots */
.hp-field { position: absolute; left: -9999px; top: -9999px; opacity: 0; height: 0; width: 0; overflow: hidden; }

button[type=submit] {
  width: 100%;
  padding: 16px;
  margin-top: 10px;
  background: linear-gradient(135deg, var(--blue-800), var(--blue-600));
  color: #fff;
  font-size: 1.05rem;
  font-weight: 700;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  box-shadow: var(--shadow-btn);
  transition: transform .15s, opacity .2s;
  letter-spacing: .3px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
}

button[type=submit]:hover { transform: translateY(-2px); opacity: .95; }
button[type=submit]:active { transform: translateY(0); }
button[type=submit]:disabled { opacity: .65; cursor: not-allowed; transform: none; }

.spinner {
  width: 20px; height: 20px;
  border: 3px solid rgba(255,255,255,.4);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin .7s linear infinite;
  display: none;
}

@keyframes spin { to { transform: rotate(360deg); } }

.notice {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  background: #fff8e1;
  border: 1px solid #ffe082;
  color: #7a5b00;
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  font-size: .84rem;
  line-height: 1.45;
  margin-bottom: 18px;
}
.notice span { font-size: 1.1rem; line-height: 1; }

.alert { display: none; border-radius: var(--radius-sm); padding: 12px 16px; font-size: .88rem; margin-bottom: 18px; }
.alert.error { background: #fef2f2; border: 1px solid #fecaca; color: #b91c1c; }
.alert.show { display: block; animation: fadeInUp .3s ease both; }

.success-box { display: none; text-align: center; padding: 20px 0 4px; }
.success-box .check { font-size: 3.4rem; animation: pop .5s ease both; }
@keyframes pop { 0% { transform: scale(0); } 70% { transform: scale(1.15); } 100% { transform: scale(1); } }
.success-box h2 { color: var(--blue-800); font-size: 1.35rem; margin: 12px 0 8px; }
.success-box p { color: var(--gray-500); font-size: .92rem; max-width: 400px; margin-inline: auto; }

footer.note { text-align: center; font-size: .76rem; color: #b7c0d8; margin-top: 26px; }

@media (max-width: 480px) {
  .card { padding: 28px 20px; }
  .header h1 { font-size: 1.35rem; }
}