/* 날짜 계산기 전용 스타일 */

.tab-nav {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    border-bottom: 2px solid var(--glass-border);
    padding-bottom: 0;
}

.tab-btn {
    background: none;
    border: none;
    padding: 0.75rem 1.2rem;
    font-size: 0.95rem;
    cursor: pointer;
    color: var(--text-secondary);
    border-bottom: 3px solid transparent;
    margin-bottom: -2px;
    transition: color 0.2s, border-color 0.2s;
    font-weight: 500;
}

.tab-btn.active {
    color: var(--pastel-blue-1);
    border-bottom-color: var(--pastel-blue-1);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.diff-result-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
    margin-top: 1rem;
}

.diff-result-item {
    text-align: center;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 10px;
    padding: 1rem 0.5rem;
}

.diff-result-value {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--pastel-blue-1);
    line-height: 1;
}

.diff-result-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-top: 0.3rem;
}

.add-result-box {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 1.5rem;
    text-align: center;
    margin-top: 1rem;
}

.add-result-date {
    font-size: 2rem;
    font-weight: 700;
    color: var(--pastel-blue-1);
    margin-bottom: 0.5rem;
}

.add-result-weekday {
    font-size: 1rem;
    color: var(--text-secondary);
}

@media (max-width: 768px) {
    .diff-result-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}