.sequence-heading {
    margin-top: 2.5rem;
    margin-bottom: 1rem;
    font-size: 1.4rem;
    color: var(--text-primary);
    font-weight: 600;
}

.sequence-container {
    background-color: var(--surface-alt);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    margin-bottom: 2rem;
    border: 1px solid var(--border);
}

.dna-sequence {
    position: relative;
}

.sequence-text {
    font-family: monospace;
    font-size: 0.9rem;
    line-height: 1.6;
    background-color: var(--surface);
    padding: 1rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-light);
    white-space: pre-wrap;
    word-break: break-all;
    max-height: 200px;
    overflow-y: auto;
    color: #333;
    letter-spacing: 1px;
}

.sequence-actions {
    position: absolute;
    top: 0.75rem;
    right: 0.75rem;
    display: flex;
    /* flex-direction: column; */
    gap: 0.5rem;
}

.sequence-actions button {
    padding: 0.35rem 0.75rem;
    font-size: 0.85rem;
    opacity: 0.85;
    transition: all 0.2s ease;
    border-radius: 4px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.sequence-actions button:hover {
    opacity: 1;
    transform: translateY(-1px);
    box-shadow: 0 2px 5px rgba(0,0,0,0.15);
}

.export-json {
    white-space: nowrap;
}

/* Color-code DNA bases */
.sequence-text .a, .sequence-text .A { color: #1a9850; }
.sequence-text .t, .sequence-text .T { color: #d73027; }
.sequence-text .g, .sequence-text .G { color: #fdae61; }
.sequence-text .c, .sequence-text .C { color: #4575b4; }

/* Barcode Visualization */
.barcode-visualization {
    margin-top: 1rem;
    background-color: var(--surface);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-light);
    padding: 1rem;
}

.barcode-loading {
    color: var(--text-secondary);
    font-style: italic;
    text-align: center;
    padding: 1rem 0;
}

.barcode-title {
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.barcode-rows {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.barcode-row {
    display: flex;
    align-items: center;
    height: 30px;
}

.barcode-position {
    font-family: monospace;
    font-size: 0.8rem;
    color: var(--text-secondary);
    width: 40px;
    text-align: right;
    padding-right: 10px;
}

.barcode-position.end {
    text-align: left;
    padding-left: 10px;
    padding-right: 0;
}

.barcode-container {
    display: flex;
    height: 30px;
    flex-grow: 1;
    max-width: 100%;
    overflow: hidden;
}

.barcode-line {
    height: 100%;
    flex: 1;
    min-width: 1px;
    max-width: 3px;
    margin: 0 .3px;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .sequence-text {
        font-size: 0.8rem;
        padding: 0.75rem;
        max-height: 150px;
    }
}