/* 수면 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;
}

/* 수면 카드 그리드 */
.sleep-cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 1rem;
    padding: 1rem 0;
}

/* 개별 수면 카드 */
.sleep-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 1.2rem 1rem;
    text-align: center;
    transition: border-color 0.2s, box-shadow 0.2s;
    position: relative;
}

.sleep-card.recommended {
    border-color: var(--pastel-blue-1);
    box-shadow: 0 0 0 2px rgba(217, 119, 87, 0.15);
}

/* 추천 배지 */
.recommended-badge {
    position: absolute;
    top: -10px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, var(--pastel-blue-1), var(--pastel-blue-2));
    color: white;
    font-size: 0.7rem;
    font-weight: 700;
    padding: 0.2rem 0.6rem;
    border-radius: 20px;
    white-space: nowrap;
}

/* 카드 내 시각 표시 */
.sleep-time {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--pastel-blue-1);
    line-height: 1.2;
    margin-bottom: 0.4rem;
    margin-top: 0.3rem;
}

.sleep-card.recommended .sleep-time {
    font-size: 1.8rem;
}

/* 수면 시간 및 사이클 */
.sleep-duration {
    font-size: 0.82rem;
    color: var(--text-secondary);
    margin-bottom: 0.2rem;
}

.sleep-cycles {
    font-size: 0.78rem;
    color: var(--text-secondary);
    opacity: 0.8;
}

/* 결과 안내 메시지 */
.sleep-result-note {
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-align: center;
    margin-top: 0.75rem;
    padding-top: 0.75rem;
    border-top: 1px solid var(--glass-border);
}

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

    .sleep-time {
        font-size: 1.4rem;
    }

    .sleep-card.recommended .sleep-time {
        font-size: 1.5rem;
    }
}