.ipcalc-wrap {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 16px 28px;
}

.ipcalc-hero {
  margin-top: 16px;
}

.ipcalc-hero h2 {
  margin-top: 0;
  color: var(--mint);
}

.ipcalc-grid {
  column-count: 3;
  column-gap: 16px;
  margin-bottom: 20px;
}

.calc-card {
  display: inline-block;
  width: 100%;
  margin: 0 0 16px;
  max-width: none;
  break-inside: avoid;
  page-break-inside: avoid;
}

.calc-card h3 {
  margin-top: 0;
  color: var(--mint);
  font-size: 18px;
}

.calc-form-row,
.calc-form-col {
  display: flex;
  gap: 10px;
  margin-bottom: 12px;
}

.calc-form-row {
  flex-wrap: wrap;
  align-items: center;
}

.calc-form-col {
  flex-direction: column;
}

.calc-card input,
.calc-card select {
  width: 100%;
  padding: 10px;
  border: 2px solid var(--mint);
  border-radius: 6px;
  font-size: 14px;
  font-family: 'Courier New', monospace;
}

.calc-form-row input[type='number'] {
  width: 130px;
}

.calc-output {
  background: #f5f5f5;
  border-left: 4px solid var(--mint);
  border-radius: 6px;
  padding: 10px 12px;
  min-height: 44px;
  font-family: 'Courier New', monospace;
  font-size: 13px;
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-word;
}

.calc-output.error {
  border-left-color: #b53e3e;
}

.multicast-card ul {
  margin: 0;
  padding-left: 18px;
}

.multicast-card li {
  margin-bottom: 8px;
}

.dark-mode .calc-card input,
.dark-mode .calc-card select {
  background: #1a1a1a;
  color: var(--text-dark);
  border-color: var(--mint-dark);
}

.dark-mode .calc-output {
  background: #1a1a1a;
  color: #aaa;
}

@media (max-width: 768px) {
  .ipcalc-grid {
    column-count: 1;
  }

  .calc-form-row input[type='number'] {
    width: 100%;
  }

  .calc-form-row .base-btn {
    width: 100%;
  }
}

@media (max-width: 1100px) and (min-width: 769px) {
  .ipcalc-grid {
    column-count: 2;
  }
}

@media (max-width: 480px) {
  .ipcalc-wrap {
    padding: 0 12px 24px;
  }

  .calc-card h3 {
    font-size: 17px;
  }

  .calc-form-row {
    flex-direction: column;
    align-items: stretch;
  }

  .calc-form-row .base-btn,
  .calc-form-col .base-btn {
    width: 100%;
  }
}