/* ===================================
   HEART RATE ZONE CALCULATOR STYLES
   =================================== */

.heartrate-section {
    padding: var(--spacing-2xl) 0;
}

.heartrate-calculator-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: start;
}

/* Measure Guide */

.measure-guide {
    margin-top: var(--spacing-xl);
    padding: var(--spacing-lg);
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid rgba(59, 130, 246, 0.2);
    border-radius: var(--radius-md);
}

.measure-guide h4 {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 600;
    color: white;
    margin-bottom: var(--spacing-md);
}

.measure-guide ol {
    margin: 0;
    padding-left: var(--spacing-lg);
    color: var(--gray-300);
    line-height: 1.8;
}

.measure-guide li {
    margin-bottom: var(--spacing-xs);
}

/* HR Metrics */

.hr-metrics {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.hr-metric-card {
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.1), rgba(248, 113, 113, 0.1));
    border: 2px solid rgba(239, 68, 68, 0.3);
    border-radius: var(--radius-md);
    text-align: center;
}

.hr-metric-card .metric-label {
    font-size: 0.875rem;
    color: var(--gray-400);
    margin-bottom: var(--spacing-sm);
}

.hr-metric-card .metric-value {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 800;
    color: #f87171;
}

/* Heart Rate Zones */

.hr-zones {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.hr-zone-card {
    padding: var(--spacing-lg);
    background: rgba(255, 255, 255, 0.03);
    border-left: 4px solid;
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    animation: slideIn 0.5s ease-out;
}

.hr-zone-card:hover {
    background: rgba(255, 255, 255, 0.05);
    transform: translateX(4px);
}

.hr-zone-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.hr-zone-name {
    font-family: var(--font-display);
    font-size: 1.125rem;
    font-weight: 700;
    color: white;
}

.hr-zone-percentage {
    font-size: 0.875rem;
    color: var(--gray-400);
    font-weight: 600;
}

.hr-zone-range {
    font-size: 1.5rem;
    font-weight: 800;
    margin-bottom: var(--spacing-sm);
}

.hr-zone-description {
    font-size: 0.9375rem;
    color: var(--gray-300);
    line-height: 1.6;
}

/* Zone Colors */

.hr-zone-card.zone-1 {
    border-color: #10b981;
}

.hr-zone-card.zone-1 .hr-zone-range {
    color: #10b981;
}

.hr-zone-card.zone-2 {
    border-color: #3b82f6;
}

.hr-zone-card.zone-2 .hr-zone-range {
    color: #3b82f6;
}

.hr-zone-card.zone-3 {
    border-color: #fbbf24;
}

.hr-zone-card.zone-3 .hr-zone-range {
    color: #fbbf24;
}

.hr-zone-card.zone-4 {
    border-color: #f97316;
}

.hr-zone-card.zone-4 .hr-zone-range {
    color: #f97316;
}

.hr-zone-card.zone-5 {
    border-color: #ef4444;
}

.hr-zone-card.zone-5 .hr-zone-range {
    color: #ef4444;
}

/* Responsive */

@media (max-width: 1024px) {
    .heartrate-calculator-wrapper {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .hr-metrics {
        grid-template-columns: 1fr;
    }
}