.email-split-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(360px, 0.88fr);
  gap: 16px;
  align-items: start;
}

.email-split-input-panel {
  min-height: 526px;
}

.email-split-drop {
  min-height: 300px;
}

.email-split-source {
  min-height: 300px;
  font-family: var(--mono);
  font-size: 13px;
}

.email-split-help {
  display: grid;
  gap: 5px;
  margin-top: 12px;
  padding: 11px 13px;
  border: 1px solid rgba(23, 50, 58, 0.1);
  border-radius: 13px;
  background: rgba(23, 50, 58, 0.045);
  color: var(--soft);
  font-size: 13px;
  line-height: 1.5;
}

.email-split-help strong {
  color: var(--ink);
}

.email-split-controls {
  display: grid;
  grid-template-columns: minmax(120px, 0.55fr) minmax(0, 1.15fr) minmax(0, 0.7fr);
  gap: 10px;
  align-items: end;
  margin-top: 14px;
}

.email-split-controls .field {
  min-width: 0;
}

.email-split-output {
  overflow: hidden;
  border: 1px solid rgba(23, 50, 58, 0.12);
  border-radius: 20px;
  background: rgba(255, 251, 243, 0.78);
  box-shadow: 0 18px 44px rgba(32, 40, 47, 0.1);
}

.email-split-output-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 20px;
  border-bottom: 1px solid rgba(23, 50, 58, 0.1);
  background: linear-gradient(135deg, rgba(255, 247, 233, 0.9), rgba(255, 255, 255, 0.64));
}

.email-split-output-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.email-split-output-actions button {
  min-height: 34px;
  padding: 0 11px;
  border-radius: 9px;
  font-size: 12px;
}

.email-split-preview {
  min-height: 384px;
  max-height: 540px;
  margin: 0;
  padding: 18px;
  overflow: auto;
  font-family: var(--mono);
  font-size: 12.5px;
  line-height: 1.6;
  color: #143039;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.52), rgba(248, 244, 236, 0.86));
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.email-split-boundary {
  padding: 15px 20px 18px;
  border-top: 1px solid rgba(23, 50, 58, 0.1);
  background: rgba(23, 50, 58, 0.035);
}

.email-split-boundary strong {
  color: var(--accent-strong);
  font-size: 13px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.email-split-boundary p {
  margin: 8px 0 0;
  color: var(--soft);
  font-size: 13px;
  line-height: 1.55;
}

@media (max-width: 900px) {
  .email-split-grid {
    grid-template-columns: 1fr;
  }

  .email-split-input-panel {
    min-height: 0;
  }
}

@media (max-width: 640px) {
  .email-split-controls {
    grid-template-columns: 1fr;
  }

  .email-split-output-head,
  .email-split-boundary {
    padding-left: 18px;
    padding-right: 18px;
  }

  .email-split-output-head {
    align-items: flex-start;
    flex-direction: column;
  }
}