/* Base64 to TSV - mobile-first */
.b64tsv-tool {
    margin-bottom: 2rem;
}

.b64tsv-panels {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.b64tsv-panel {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    background: var(--bg-card, #fff);
    border: 1px solid var(--border-subtle, #e2e8f0);
    border-radius: 12px;
    padding: 1rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

.b64tsv-label {
    font-size: 0.8125rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted, #64748b);
}

.b64tsv-textarea {
    width: 100%;
    min-height: 180px;
    padding: 0.875rem 1rem;
    font-size: 0.875rem;
    line-height: 1.5;
    color: var(--text-primary, #0f172a);
    background: var(--bg-secondary, #f8fafc);
    border: 1px solid var(--border-subtle, #e2e8f0);
    border-radius: 8px;
    resize: vertical;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.b64tsv-textarea::placeholder {
    color: var(--text-muted, #94a3b8);
}

.b64tsv-textarea:focus {
    outline: none;
    border-color: var(--primary, #0f172a);
    box-shadow: 0 0 0 3px rgba(15, 23, 42, 0.08);
}

.b64tsv-textarea-output {
    background: var(--bg-secondary, #f1f5f9);
    cursor: default;
}

.b64tsv-hint {
    font-size: 0.75rem;
    color: var(--text-muted, #94a3b8);
}

.b64tsv-status {
    min-height: 1.5rem;
    margin-top: 0.75rem;
    padding: 0.5rem 0;
    font-size: 0.875rem;
    color: var(--text-muted, #64748b);
}

.b64tsv-status.is-error {
    color: var(--danger, #dc2626);
}

.b64tsv-status.is-success {
    color: var(--success, #16a34a);
}

.b64tsv-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: 1.25rem;
}

.b64tsv-btn {
    min-height: 44px;
    padding: 0.625rem 1.25rem;
    font-size: 0.9375rem;
    font-weight: 600;
    
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.2s, color 0.2s, border-color 0.2s, transform 0.1s;
}

.b64tsv-btn:active {
    transform: scale(0.98);
}

.b64tsv-btn-primary {
    color: var(--primary-inverse, #fff);
    background: var(--primary, #0f172a);
    border: 1px solid var(--primary, #0f172a);
}

.b64tsv-btn-primary:hover {
    background: var(--primary-hover, #1e293b);
    border-color: var(--primary-hover, #1e293b);
}

.b64tsv-btn-secondary {
    color: var(--text-primary, #0f172a);
    background: var(--bg-secondary, #f1f5f9);
    border: 1px solid var(--border-subtle, #e2e8f0);
}

.b64tsv-btn-secondary:hover {
    background: var(--bg-tertiary, #e2e8f0);
}

.b64tsv-btn-outline {
    color: var(--primary, #0f172a);
    background: transparent;
    border: 1px solid var(--primary, #0f172a);
}

.b64tsv-btn-outline:hover {
    background: rgba(15, 23, 42, 0.06);
}

/* Desktop: side-by-side panels */
@media (min-width: 768px) {
    .b64tsv-panels {
        flex-direction: row;
        gap: 1.5rem;
    }

    .b64tsv-panel {
        flex: 1;
        min-width: 0;
        padding: 1.25rem;
    }

    .b64tsv-textarea {
        min-height: 240px;
    }
}

@media (min-width: 992px) {
    .b64tsv-textarea {
        min-height: 280px;
    }
}