/* =========================================
   BMI CALCULATOR CSS
   ========================================= */

:root {
    --bmi-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --bmi-bg-dark: #0f172a;
    --bmi-bg-card: #1e293b;
    --bmi-bg-input: #0f172a;
    --bmi-border: #334155;
    --bmi-border-light: #475569;
    --bmi-white: #ffffff;
    --bmi-gray: #cbd5e1;
    --bmi-muted: #94a3b8;
    --bmi-success: #22c55e;
    --bmi-warning: #eab308;
    --bmi-danger: #ef4444;
    --bmi-purple: #a855f7;
    --bmi-underweight: #3b82f6;
    --bmi-normal: #22c55e;
    --bmi-overweight: #eab308;
    --bmi-obese: #ef4444;
}

.bmi-calc-wrapper {
    background: linear-gradient(to bottom, var(--bmi-bg-dark), var(--bmi-bg-card));
    padding: 3rem 1.5rem;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    color: var(--bmi-white);
    line-height: 1.6;
    min-height: 100vh;
}

.bmi-calc-wrapper * {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

.bmi-calc-container {
    max-width: 900px;
    margin: 0 auto;
}

/* Header */
.bmi-calc-wrapper .calc-header {
    text-align: center;
    margin-bottom: 2.5rem;
}

.bmi-calc-wrapper .calc-title {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--bmi-white);
    margin-bottom: 1rem;
}

.bmi-calc-wrapper .calc-description {
    font-size: 1.1rem;
    color: var(--bmi-gray);
    max-width: 700px;
    margin: 0 auto;
}

/* Card */
.bmi-calc-wrapper .calc-card {
    background: var(--bmi-bg-card);
    border: 1px solid var(--bmi-border);
    border-radius: 1.5rem;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: 0 20px 40px rgba(0,0,0,0.3);
}

/* Unit Toggle */
.bmi-calc-wrapper .unit-toggle {
    display: flex;
    gap: 0.5rem;
    background: var(--bmi-bg-input);
    padding: 0.5rem;
    border-radius: 1rem;
    margin-bottom: 2rem;
}

.bmi-calc-wrapper .unit-btn {
    flex: 1;
    padding: 0.875rem 1.5rem;
    border: none;
    border-radius: 0.75rem;
    background: transparent;
    color: var(--bmi-muted);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.bmi-calc-wrapper .unit-btn:hover {
    color: var(--bmi-white);
}

.bmi-calc-wrapper .unit-btn.active {
    background: var(--bmi-gradient);
    color: var(--bmi-white);
}

/* Form */
.bmi-calc-wrapper .bmi-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.bmi-calc-wrapper .form-group {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.bmi-calc-wrapper .form-label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--bmi-gray);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Gender Toggle */
.bmi-calc-wrapper .gender-toggle {
    display: flex;
    gap: 1rem;
}

.bmi-calc-wrapper .gender-btn {
    flex: 1;
    padding: 1rem 1.5rem;
    border: 2px solid var(--bmi-border);
    border-radius: 0.75rem;
    background: transparent;
    color: var(--bmi-muted);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
}

.bmi-calc-wrapper .gender-btn:hover {
    border-color: var(--bmi-border-light);
    color: var(--bmi-white);
}

.bmi-calc-wrapper .gender-btn.active {
    border-color: #667eea;
    background: rgba(102,126,234,0.1);
    color: var(--bmi-white);
}

/* Input */
.bmi-calc-wrapper .input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.bmi-calc-wrapper .input-row {
    display: flex;
    gap: 1rem;
}

.bmi-calc-wrapper .input-row .input-wrapper {
    flex: 1;
}

.bmi-calc-wrapper .form-input {
    width: 100%;
    padding: 1rem 1.25rem;
    padding-right: 4rem;
    border: 1px solid var(--bmi-border-light);
    border-radius: 0.75rem;
    background: var(--bmi-bg-input);
    color: var(--bmi-white);
    font-size: 1.1rem;
    font-weight: 500;
    transition: all 0.3s ease;
}

.bmi-calc-wrapper .form-input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102,126,234,0.15);
}

.bmi-calc-wrapper .form-input::placeholder {
    color: var(--bmi-muted);
}

.bmi-calc-wrapper .input-suffix {
    position: absolute;
    right: 1.25rem;
    color: var(--bmi-muted);
    font-size: 0.9rem;
    font-weight: 600;
}

/* Imperial - Hide by default */
.bmi-calc-wrapper .height-imperial,
.bmi-calc-wrapper .weight-imperial {
    display: none;
}

/* Buttons */
.bmi-calc-wrapper .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    border: none;
    border-radius: 0.75rem;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.bmi-calc-wrapper .btn-primary {
    background: var(--bmi-gradient);
    color: var(--bmi-white);
}

.bmi-calc-wrapper .btn-primary:hover {
    opacity: 0.9;
    transform: translateY(-2px);
}

.bmi-calc-wrapper .btn-secondary {
    background: var(--bmi-border);
    color: var(--bmi-white);
}

.bmi-calc-wrapper .btn-secondary:hover {
    background: var(--bmi-border-light);
}

.bmi-calc-wrapper .controls {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.bmi-calc-wrapper .controls .btn {
    flex: 1;
    min-width: 150px;
}

/* Result Section */
.bmi-calc-wrapper .result-section {
    display: none;
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--bmi-border);
}

.bmi-calc-wrapper .result-section.show {
    display: block;
    animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.bmi-calc-wrapper .bmi-result-main {
    display: flex;
    gap: 2rem;
    justify-content: center;
    margin-bottom: 2rem;
}

.bmi-calc-wrapper .bmi-value-wrapper,
.bmi-calc-wrapper .bmi-category-wrapper {
    text-align: center;
    padding: 1.5rem 2.5rem;
    background: var(--bmi-bg-input);
    border-radius: 1rem;
    border: 1px solid var(--bmi-border);
}

.bmi-calc-wrapper .bmi-value-label,
.bmi-calc-wrapper .bmi-category-label {
    font-size: 0.85rem;
    color: var(--bmi-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 0.5rem;
}

.bmi-calc-wrapper .bmi-value {
    font-size: 3.5rem;
    font-weight: 800;
    color: var(--bmi-white);
}

.bmi-calc-wrapper .bmi-category {
    font-size: 1.5rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.bmi-calc-wrapper .bmi-category.underweight { color: var(--bmi-underweight); }
.bmi-calc-wrapper .bmi-category.normal { color: var(--bmi-normal); }
.bmi-calc-wrapper .bmi-category.overweight { color: var(--bmi-overweight); }
.bmi-calc-wrapper .bmi-category.obese { color: var(--bmi-obese); }

/* BMI Scale */
.bmi-calc-wrapper .bmi-scale {
    margin-bottom: 2rem;
}

.bmi-calc-wrapper .bmi-scale-bar {
    height: 12px;
    border-radius: 6px;
    background: linear-gradient(to right, 
        var(--bmi-underweight) 0%, 
        var(--bmi-underweight) 18.5%, 
        var(--bmi-normal) 18.5%, 
        var(--bmi-normal) 50%, 
        var(--bmi-overweight) 50%, 
        var(--bmi-overweight) 75%, 
        var(--bmi-obese) 75%, 
        var(--bmi-obese) 100%
    );
    position: relative;
    margin-bottom: 0.75rem;
}

.bmi-calc-wrapper .bmi-scale-indicator {
    position: absolute;
    top: -6px;
    width: 24px;
    height: 24px;
    background: var(--bmi-white);
    border-radius: 50%;
    border: 3px solid var(--bmi-bg-dark);
    box-shadow: 0 2px 8px rgba(0,0,0,0.3);
    transform: translateX(-50%);
    transition: left 0.5s ease;
    left: 0%;
}

.bmi-calc-wrapper .bmi-scale-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
    color: var(--bmi-muted);
    text-align: center;
}

.bmi-calc-wrapper .bmi-scale-labels span {
    flex: 1;
}

/* BMI Info Grid */
.bmi-calc-wrapper .bmi-info-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    margin-bottom: 2rem;
}

.bmi-calc-wrapper .bmi-info-box {
    display: flex;
    gap: 1rem;
    padding: 1.25rem;
    background: var(--bmi-bg-input);
    border-radius: 0.75rem;
    border: 1px solid var(--bmi-border);
}

.bmi-calc-wrapper .bmi-info-icon {
    width: 48px;
    height: 48px;
    min-width: 48px;
    background: var(--bmi-gradient);
    border-radius: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    color: var(--bmi-white);
}

.bmi-calc-wrapper .bmi-info-content {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.bmi-calc-wrapper .bmi-info-label {
    font-size: 0.8rem;
    color: var(--bmi-muted);
    margin-bottom: 0.25rem;
}

.bmi-calc-wrapper .bmi-info-value {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--bmi-white);
}

/* Health Message */
.bmi-calc-wrapper .health-message {
    display: flex;
    gap: 1rem;
    padding: 1.25rem;
    background: rgba(102,126,234,0.1);
    border: 1px solid rgba(102,126,234,0.3);
    border-radius: 0.75rem;
}

.bmi-calc-wrapper .health-message i {
    font-size: 1.25rem;
    color: #667eea;
    flex-shrink: 0;
}

.bmi-calc-wrapper .health-message-text {
    font-size: 0.95rem;
    color: var(--bmi-gray);
    line-height: 1.6;
}

/* Info Cards */
.bmi-calc-wrapper .info-card {
    background: var(--bmi-bg-card);
    border: 1px solid var(--bmi-border);
    border-radius: 1.5rem;
    padding: 2rem;
    margin-bottom: 1.5rem;
}

.bmi-calc-wrapper .info-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--bmi-white);
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.bmi-calc-wrapper .info-title i {
    color: var(--bmi-purple);
}

/* BMI Chart */
.bmi-calc-wrapper .bmi-chart {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.bmi-calc-wrapper .bmi-chart-row {
    display: grid;
    grid-template-columns: 150px 100px 1fr;
    gap: 1rem;
    align-items: center;
}

.bmi-calc-wrapper .chart-category {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 500;
    color: var(--bmi-gray);
}

.bmi-calc-wrapper .chart-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.bmi-calc-wrapper .bmi-chart-row.underweight .chart-dot { background: var(--bmi-underweight); }
.bmi-calc-wrapper .bmi-chart-row.normal .chart-dot { background: var(--bmi-normal); }
.bmi-calc-wrapper .bmi-chart-row.overweight .chart-dot { background: var(--bmi-overweight); }
.bmi-calc-wrapper .bmi-chart-row.obese .chart-dot { background: var(--bmi-obese); }

.bmi-calc-wrapper .chart-range {
    font-size: 0.9rem;
    color: var(--bmi-muted);
}

.bmi-calc-wrapper .chart-bar {
    height: 24px;
    background: var(--bmi-bg-input);
    border-radius: 0.5rem;
    overflow: hidden;
}

.bmi-calc-wrapper .chart-fill {
    height: 100%;
    border-radius: 0.5rem;
}

.bmi-calc-wrapper .bmi-chart-row.underweight .chart-fill { background: var(--bmi-underweight); width: 20%; }
.bmi-calc-wrapper .bmi-chart-row.normal .chart-fill { background: var(--bmi-normal); width: 65%; }
.bmi-calc-wrapper .bmi-chart-row.overweight .chart-fill { background: var(--bmi-overweight); width: 50%; }
.bmi-calc-wrapper .bmi-chart-row.obese .chart-fill { background: var(--bmi-obese); width: 40%; }

/* Steps */
.bmi-calc-wrapper .steps-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

.bmi-calc-wrapper .step-item {
    display: flex;
    gap: 1rem;
}

.bmi-calc-wrapper .step-number {
    width: 40px;
    height: 40px;
    min-width: 40px;
    background: var(--bmi-gradient);
    border-radius: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    color: var(--bmi-white);
}

.bmi-calc-wrapper .step-content h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--bmi-white);
    margin-bottom: 0.25rem;
}

.bmi-calc-wrapper .step-content p {
    font-size: 0.9rem;
    color: var(--bmi-muted);
}

/* FAQ */
.bmi-calc-wrapper .faq-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.bmi-calc-wrapper .faq-item {
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--bmi-border);
}

.bmi-calc-wrapper .faq-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.bmi-calc-wrapper .faq-item h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--bmi-white);
    margin-bottom: 0.5rem;
}

.bmi-calc-wrapper .faq-item p {
    font-size: 0.95rem;
    color: var(--bmi-muted);
    line-height: 1.7;
}

/* Disclaimer */
.bmi-calc-wrapper .disclaimer-card {
    display: flex;
    gap: 1rem;
    padding: 1.5rem;
    background: rgba(239,68,68,0.1);
    border: 1px solid rgba(239,68,68,0.3);
    border-radius: 1rem;
    margin-top: 1.5rem;
}

.bmi-calc-wrapper .disclaimer-icon i {
    font-size: 1.5rem;
    color: var(--bmi-danger);
}

.bmi-calc-wrapper .disclaimer-content h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--bmi-white);
    margin-bottom: 0.5rem;
}

.bmi-calc-wrapper .disclaimer-content p {
    font-size: 0.9rem;
    color: var(--bmi-muted);
}

/* Responsive */
@media (max-width: 768px) {
    .bmi-calc-wrapper {
        padding: 2rem 1rem;
    }
    
    .bmi-calc-wrapper .calc-title {
        font-size: 2rem;
    }
    
    .bmi-calc-wrapper .calc-card {
        padding: 1.5rem;
    }
    
    .bmi-calc-wrapper .unit-toggle {
        flex-direction: column;
    }
    
    .bmi-calc-wrapper .gender-toggle {
        flex-direction: column;
    }
    
    .bmi-calc-wrapper .input-row {
        flex-direction: column;
    }
    
    .bmi-calc-wrapper .controls {
        flex-direction: column;
    }
    
    .bmi-calc-wrapper .controls .btn {
        width: 100%;
    }
    
    .bmi-calc-wrapper .bmi-result-main {
        flex-direction: column;
        gap: 1rem;
    }
    
    .bmi-calc-wrapper .bmi-info-grid {
        grid-template-columns: 1fr;
    }
    
    .bmi-calc-wrapper .bmi-chart-row {
        grid-template-columns: 1fr;
        gap: 0.5rem;
        padding: 1rem;
        background: var(--bmi-bg-input);
        border-radius: 0.75rem;
    }
    
    .bmi-calc-wrapper .steps-grid {
        grid-template-columns: 1fr;
    }
    
    .bmi-calc-wrapper .disclaimer-card {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .bmi-calc-wrapper .calc-title {
        font-size: 1.75rem;
    }
    
    .bmi-calc-wrapper .bmi-value {
        font-size: 2.5rem;
    }
    
    .bmi-calc-wrapper .bmi-category {
        font-size: 1.25rem;
    }
    
    .bmi-calc-wrapper .info-title {
        font-size: 1.25rem;
    }
}