.buffer-layout {
  display: grid;
  gap: 24px;
}

@media (min-width: 1100px) {
  .buffer-layout {
    grid-template-columns: minmax(0, 58%) minmax(0, 42%);
    align-items: start;
  }
}

.buffer-card {
  background: var(--surface-0, #ffffff);
  border: 1px solid var(--border, #d0d7de);
  border-radius: 12px;
  padding: 24px;
  box-shadow: 0 18px 40px -28px rgba(15, 23, 42, 0.35);
}

.buffer-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.buffer-tab {
  appearance: none;
  border: 1px solid var(--border, #d0d7de);
  border-radius: 999px;
  background: var(--surface-100, #f5f7fb);
  color: var(--text-muted, #54606f);
  padding: 8px 16px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.15s ease;
}

.buffer-tab-active {
  background: linear-gradient(120deg, var(--accent-700, #1d4ed8), var(--accent-500, #3b82f6));
  color: #ffffff;
  border-color: transparent;
  box-shadow: 0 10px 20px -16px rgba(29, 78, 216, 0.75);
}

.buffer-tab:focus-visible {
  outline: 3px solid var(--accent-200, #c7d2fe);
  outline-offset: 2px;
}

.buffer-panel {
  display: grid;
  gap: 16px;
}

.buffer-field-set {
  display: grid;
  gap: 12px;
}

@media (min-width: 720px) {
  .buffer-field-set.buffer-field-double {
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  }
}

.buffer-field-grid {
  display: grid;
  gap: 16px;
}

@media (min-width: 720px) {
  .buffer-field-grid {
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  }
}

.buffer-field {
  display: grid;
  gap: 6px;
}

.buffer-field label {
  font-weight: 600;
  color: var(--text-muted, #475569);
}

.buffer-field input,
.buffer-field select {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--border, #d0d7de);
  border-radius: 8px;
  background: var(--surface-0, #ffffff);
  font: inherit;
}

.buffer-field input:focus-visible,
.buffer-field select:focus-visible {
  outline: 2px solid var(--accent-300, #a5b4fc);
  outline-offset: 1px;
}

.buffer-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 8px;
}

.button-primary,
.button-ghost {
  appearance: none;
  border-radius: 999px;
  padding: 10px 20px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.button-primary {
  border: none;
  background: linear-gradient(120deg, var(--accent-700, #1d4ed8), var(--accent-500, #3b82f6));
  color: #ffffff;
  box-shadow: 0 16px 36px -24px rgba(29, 78, 216, 0.85);
}

.button-ghost {
  border: 1px solid var(--border, #d0d7de);
  background: var(--surface-0, #ffffff);
  color: var(--text-main, #1f2933);
}

.button-primary:focus-visible,
.button-ghost:focus-visible {
  outline: 3px solid var(--accent-200, #c7d2fe);
  outline-offset: 2px;
}

.button-primary:active,
.button-ghost:active {
  transform: scale(0.98);
}

.buffer-warning {
  margin-top: 12px;
  color: var(--warning-800, #b45309);
  font-weight: 600;
}

.buffer-error {
  color: var(--danger-700, #b91c1c);
  font-weight: 600;
  margin-top: 8px;
}

.buffer-summary-card h2 {
  margin-top: 0;
}

.buffer-summary-card #buffer-summary {
  display: grid;
  gap: 6px;
  font-variant-numeric: tabular-nums;
}

.buffer-summary-card ol {
  padding-left: 20px;
  font-variant-numeric: tabular-nums;
  display: grid;
  gap: 6px;
}

.buffer-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.buffer-meta button {
  appearance: none;
  border-radius: 999px;
  padding: 10px 20px;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid var(--border, #d0d7de);
  background: linear-gradient(120deg, var(--surface-0, #fff), var(--surface-100, #f6f8fb));
  color: var(--text-main, #1f2933);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.buffer-meta button:focus-visible {
  outline: 3px solid var(--accent-200, #c7d2fe);
  outline-offset: 2px;
}

.buffer-meta button:active {
  transform: scale(0.98);
}