/* ===== BASE CONVERTER ===== */

.bases-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin-bottom: 20px;
}

.base-card {
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  transition: all var(--transition);
}

.base-card:focus-within {
  border-color: var(--primary);
  box-shadow: var(--shadow-hover);
}

.base-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.copy-base-btn {
  margin-left: auto;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 0.85rem;
  transition: all var(--transition);
  opacity: 0;
}

.base-card:hover .copy-base-btn,
.copy-base-btn:focus-visible {
  opacity: 1;
}

.copy-base-btn:hover {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.base-badge {
  background: var(--primary);
  color: #fff;
  font-weight: 700;
  font-size: 0.72rem;
  padding: 3px 8px;
  border-radius: 6px;
  letter-spacing: 0.04em;
}

.base-name {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text);
}

.base-input {
  font-family: 'Fira Code', 'Consolas', monospace;
  font-size: 1.05rem;
  letter-spacing: 0.02em;
}

.base-validation {
  margin-top: 6px;
  font-size: 0.78rem;
  min-height: 18px;
}

.base-validation.error {
  color: var(--danger);
}

.base-validation.ok {
  color: var(--success);
}

.converter-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

.bits-grid {
  margin-top: 8px;
}

.bits-row {
  display: flex;
  gap: 6px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 12px;
}

.bit-cell {
  width: 36px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  font-family: 'Fira Code', monospace;
  font-weight: 600;
  font-size: 1rem;
  border: 2px solid var(--border);
  background: var(--bg);
  color: var(--text);
}

.bit-cell.on {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.bits-label {
  text-align: center;
  font-size: 0.82rem;
  color: var(--muted);
}

/* Calculator */
.calc-card {
  max-width: 900px;
  margin: 0 auto;
}

.calc-row {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 16px;
  align-items: end;
  margin-bottom: 16px;
}

.calc-op-group {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 100px;
}

.calc-base-select {
  margin-top: 8px;
  font-size: 0.85rem;
}

.calc-btn {
  margin-bottom: 16px;
}

.calc-results {
  margin-top: 8px;
}

.calc-results h3 {
  font-size: 1rem;
  margin-bottom: 12px;
  color: var(--text);
}

.calc-result-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 12px;
}

.calc-result-item {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 14px;
}

.calc-result-badge {
  background: var(--primary);
  color: #fff;
  font-weight: 700;
  font-size: 0.7rem;
  padding: 2px 7px;
  border-radius: 4px;
}

.calc-result-value {
  font-family: 'Fira Code', monospace;
  font-size: 0.95rem;
  word-break: break-all;
}

/* Reference */
.ref-table-wrap {
  overflow-x: auto;
}

.ref-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}

.ref-table th, .ref-table td {
  border: 1px solid var(--border);
  padding: 8px 10px;
  text-align: center;
}

.ref-table th {
  background: var(--bg);
  font-weight: 600;
}

.ref-table code {
  font-family: 'Fira Code', monospace;
  font-size: 0.85rem;
  background: rgba(102,126,234,0.08);
  padding: 2px 6px;
  border-radius: 4px;
}

@media (hover: none) {
  .copy-base-btn {
    opacity: 1;
  }
}

@media (max-width: 768px) {
  .calc-row {
    grid-template-columns: 1fr;
    align-items: stretch;
  }
  .calc-op-group {
    align-items: stretch;
  }
}