.ean13-tool {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(300px, 1.1fr);
  gap: 1.5rem;
  margin: 0 auto 2rem;
  padding: 1.5rem;
  border: 1px solid var(--border-color, #d9dde7);
  border-radius: 8px;
  background: var(--card-bg, #fff);
  box-shadow: 0 8px 24px rgba(17, 24, 39, 0.08);
}

.ean13-tool__intro,
.ean13-tool__form {
  grid-column: 1;
}

.ean13-tool__intro h2 {
  margin: 0 0 0.5rem;
  font-size: 1.35rem;
  color: var(--text-primary, #111827);
}

.ean13-tool__intro p,
.ean13-tool__hint,
.ean13-tool__status {
  line-height: 1.5;
  color: var(--text-secondary, #4b5563);
}

.ean13-tool__intro p,
.ean13-tool__status {
  margin: 0;
}

.ean13-tool__form label {
  display: block;
  margin-bottom: 0.45rem;
  font-weight: 700;
}

.ean13-tool__input-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 0.5rem;
}

.ean13-tool input {
  min-width: 0;
  padding: 0.72rem 0.8rem;
  border: 1px solid var(--border-color, #aeb5c2);
  border-radius: 6px;
  background: var(--input-bg, #fff);
  color: var(--text-primary, #111827);
  font: inherit;
  letter-spacing: 0;
}

.ean13-tool input[aria-invalid="true"] {
  border-color: #b42318;
}

.ean13-tool button,
.ean13-tool__actions a {
  min-height: 44px;
  padding: 0.68rem 0.9rem;
  border: 1px solid #4f46e5;
  border-radius: 6px;
  font: inherit;
  font-weight: 700;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
}

.ean13-tool button {
  background: #4f46e5;
  color: #fff;
}

.ean13-tool__hint {
  display: block;
  margin-top: 0.45rem;
  font-size: 0.84rem;
}

.ean13-tool__result {
  grid-column: 2;
  grid-row: 1 / span 2;
  align-self: stretch;
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-width: 0;
}

.ean13-tool__preview {
  min-height: 150px;
  display: grid;
  place-items: center;
  overflow: hidden;
  padding: 0.5rem;
  border: 1px solid #e5e7eb;
  background: #fff;
}

.ean13-tool__preview svg {
  display: block;
  max-width: 100%;
  height: auto;
}

.ean13-tool__status {
  min-height: 1.5rem;
  margin-top: 0.55rem;
  font-size: 0.9rem;
}

.ean13-tool__status--error { color: #b42318; }
.ean13-tool__status--success { color: #067647; }

.ean13-tool__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.ean13-tool__actions button {
  background: transparent;
  color: #4338ca;
}

.ean13-tool__actions a {
  display: inline-flex;
  align-items: center;
  color: #4338ca;
  border-color: transparent;
}

.ean13-tool button:hover,
.ean13-tool button:focus-visible {
  background: #3730a3;
  color: #fff;
}

.ean13-tool a:hover,
.ean13-tool a:focus-visible {
  text-decoration: underline;
}

.ean13-tool :focus-visible {
  outline: 3px solid #f59e0b;
  outline-offset: 2px;
}

@media (max-width: 720px) {
  .ean13-tool {
    grid-template-columns: minmax(0, 1fr);
    gap: 1rem;
    padding: 1rem;
  }

  .ean13-tool__intro,
  .ean13-tool__form,
  .ean13-tool__result {
    grid-column: 1;
    grid-row: auto;
  }

  .ean13-tool__input-row {
    grid-template-columns: minmax(0, 1fr);
  }

  .ean13-tool__actions {
    display: grid;
  }
}