:root {
  --bg: #f2f3f5;
  --panel-bg: #ffffff;
  --text: #1c1f26;
  --muted: #6b7280;
  --border: #dfe2e7;
  --accent: #1c1f26;
  --accent-contrast: #ffffff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.app {
  display: flex;
  min-height: 100vh;
}

/* ---------- Left panel: form ---------- */

.panel-form {
  width: 340px;
  flex-shrink: 0;
  background: var(--panel-bg);
  border-right: 1px solid var(--border);
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.panel-form h1 {
  font-size: 20px;
  margin: 0;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 18px;
}

.field label {
  font-size: 13px;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.field select,
.field input {
  padding: 10px 12px;
  font-size: 15px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fff;
  color: var(--text);
  outline: none;
  transition: border-color 0.15s ease;
}

.field select:focus,
.field input:focus {
  border-color: var(--accent);
}

.field select:disabled,
.field input:read-only {
  background: #f2f3f5;
  color: var(--muted);
  cursor: default;
}

.field input#sku {
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-family: "Consolas", monospace;
}

.field-row {
  display: flex;
  gap: 8px;
  align-items: stretch;
}

.field-row select,
.field-row input {
  flex: 1;
  min-width: 0;
}

.lock-btn {
  flex-shrink: 0;
  width: 40px;
  font-size: 15px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fff;
  color: var(--text);
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease;
}

.lock-btn:hover {
  background: #f2f3f5;
}

.lock-btn.is-unlocked {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-contrast);
}

.hint {
  font-size: 11px;
  color: var(--muted);
}

.buttons {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: auto;
}

.btn {
  padding: 12px 16px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.03em;
  border: none;
  border-radius: 8px;
  background: var(--accent);
  color: var(--accent-contrast);
  cursor: pointer;
  transition: opacity 0.15s ease, transform 0.05s ease;
}

.btn:hover:not(:disabled) {
  opacity: 0.85;
}

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

.btn:disabled {
  background: #d3d6db;
  color: #9aa0a8;
  cursor: not-allowed;
}

/* ---------- Right panel: preview ---------- */

.panel-preview {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px;
}

.label-wrap {
  width: 380px;
  max-width: 100%;
  background: #ffffff;
  box-shadow: 0 20px 45px rgba(0, 0, 0, 0.12);
}

.label-wrap svg {
  display: block;
  width: 100%;
  height: auto;
}

.label-wrap #lblBrand,
.label-wrap #lblSku,
.label-wrap #lblYears {
  font-family: Arial, sans-serif;
}

.not-applicable-message {
  width: 380px;
  max-width: 100%;
  aspect-ratio: 269.29 / 283.46;
  background: #ffffff;
  box-shadow: 0 20px 45px rgba(0, 0, 0, 0.12);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 32px;
  text-align: center;
  font-size: 15px;
  line-height: 1.5;
  color: var(--text);
}

/* El "display: flex" de arriba tiene la misma especificidad que la regla
   [hidden] { display: none; } de la hoja de estilos del navegador, y al
   estar en la hoja del autor gana ella: sin esto, un mensaje "oculto" con
   el atributo hidden se seguia mostrando. */
.not-applicable-message[hidden] {
  display: none;
}