:root {
  /* Paleta corporativa AEI */
  --bronze: #A89880;
  --piedra: #7A7870;
  --arena: #E8E3DA;
  --grafito: #3A3A38;
  --lino: #C8C4BC;
  --blanco: #FAF8F5;

  --bg: var(--grafito);
  --bg-soft: #2e2e2c;
  --panel: #323230;
  --ink: var(--blanco);
  --muted: var(--lino);
  --line: var(--piedra);
  --bronze-soft: var(--arena);
  --ok: #7dba8f;
  --danger: #d6766a;
  --shadow: 0 16px 40px rgba(0, 0, 0, 0.35);
  --radius: 14px;
  --font: "Raleway", Arial, Helvetica, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  color: var(--ink);
  background:
    radial-gradient(circle at top right, rgba(168, 152, 128, 0.18), transparent 38%),
    linear-gradient(165deg, #2a2a28 0%, var(--grafito) 55%, #2e2e2c 100%);
}

.page {
  width: min(1100px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 2.5rem 0 3rem;
}

.header {
  margin-bottom: 1.75rem;
}

.brand {
  margin: 0 0 0.35rem;
  font-size: 1.7rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--bronze);
  text-transform: uppercase;
}

.header h1 {
  margin: 0;
  font-size: clamp(1.55rem, 3vw, 2.15rem);
  font-weight: 650;
  color: var(--ink);
}

.subtitle,
.footer p,
.hint {
  margin: 0.55rem 0 0;
  color: var(--muted);
  max-width: 42rem;
  line-height: 1.5;
}

.hint {
  margin-top: 0.35rem;
  font-size: 0.82rem;
}

.layout {
  display: grid;
  grid-template-columns: 1fr 1.05fr;
  gap: 1.25rem;
}

.panel {
  background: rgba(50, 50, 48, 0.96);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.35rem 1.4rem 1.5rem;
}

.panel h2 {
  margin: 0 0 1rem;
  font-size: 1.05rem;
  color: var(--bronze);
}

.field-row {
  display: grid;
  gap: 0.35rem;
  margin-bottom: 0.9rem;
}

label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--bronze-soft);
}

input[type="text"],
input[type="tel"],
input[type="email"],
input[type="file"] {
  width: 100%;
  border: 1px solid var(--piedra);
  border-radius: 10px;
  padding: 0.72rem 0.85rem;
  font: inherit;
  color: var(--ink);
  background: #2a2a28;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

input[type="file"] {
  padding: 0.55rem 0.65rem;
}

input::placeholder {
  color: #6f675e;
}

input:focus {
  outline: none;
  border-color: var(--bronze);
  box-shadow: 0 0 0 3px rgba(168, 152, 128, 0.22);
}

input.invalid {
  border-color: var(--danger);
  box-shadow: 0 0 0 3px rgba(214, 118, 106, 0.16);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: 1.1rem;
}

.actions-preview {
  margin-top: 1rem;
}

.btn {
  border: none;
  border-radius: 999px;
  padding: 0.7rem 1.15rem;
  font: inherit;
  font-weight: 650;
  cursor: pointer;
  transition: transform 0.12s ease, opacity 0.12s ease, background 0.12s ease;
}

.btn:hover:not(:disabled) {
  transform: translateY(-1px);
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--bronze);
  color: var(--grafito);
}

.btn-primary:hover:not(:disabled) {
  background: var(--bronze-soft);
}

.btn-secondary {
  background: #2a2a28;
  color: var(--bronze);
  border: 1px solid var(--piedra);
}

.btn-ghost {
  background: transparent;
  color: var(--bronze-soft);
  border: 1px solid var(--piedra);
}

.preview-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 0.85rem;
}

.preview-header h2 {
  margin: 0;
}

.status {
  margin: 0;
  font-size: 0.85rem;
  color: var(--ok);
  min-height: 1.2em;
}

.status.error {
  color: var(--danger);
}

.preview-empty {
  border: 1px dashed var(--piedra);
  border-radius: 12px;
  padding: 1.5rem;
  color: var(--muted);
  background: #2a2a28;
  line-height: 1.5;
}

.preview-wrap {
  border: 1px solid var(--piedra);
  border-radius: 12px;
  padding: 1.25rem;
  background: var(--grafito);
  overflow: auto;
}

.signature-preview {
  width: max-content;
  max-width: 100%;
}

.outlook-preview-img {
  display: block;
  max-width: 100%;
  height: auto;
  border: 0;
  user-select: all;
  -webkit-user-select: all;
}

.copy-zone {
  outline: none;
  cursor: pointer;
  width: max-content;
  max-width: 100%;
}

.copy-zone:focus {
  box-shadow: 0 0 0 2px rgba(168, 152, 128, 0.45);
}

.copy-zone img {
  display: block;
}

.copy-hint {
  margin-top: 0.75rem;
}

.howto code {
  color: #d8c2a2;
  word-break: break-all;
}

.hidden {
  display: none !important;
}

.howto {
  margin-top: 1.15rem;
  padding-top: 1rem;
  border-top: 1px solid var(--piedra);
}

.howto h3 {
  margin: 0 0 0.55rem;
  font-size: 0.95rem;
  color: var(--bronze);
}

.howto ol {
  margin: 0;
  padding-left: 1.15rem;
  color: var(--muted);
  line-height: 1.55;
  font-size: 0.86rem;
}

.howto li + li {
  margin-top: 0.45rem;
}

.howto strong,
.howto em {
  color: var(--bronze-soft);
  font-style: normal;
}

.footer {
  margin-top: 1.5rem;
}

.footer a,
.footer a:link,
.footer a:visited,
.footer-link,
.footer-link:link,
.footer-link:visited {
  color: var(--bronze);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.footer a:hover,
.footer a:focus-visible,
.footer-link:hover,
.footer-link:focus-visible {
  color: var(--bronze-soft);
  border-bottom-color: var(--bronze-soft);
  outline: none;
}

@media (max-width: 860px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .page {
    width: min(100% - 1.25rem, 1100px);
    padding-top: 1.5rem;
  }

  .preview-header {
    flex-direction: column;
    align-items: flex-start;
  }
}