@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&display=swap');

:root {
    --bmi-primary: #2563eb;
    --bmi-primary-hover: #1d4ed8;
    --bmi-primary-soft: rgba(37, 99, 235, 0.08);
    --bmi-bg-card: #ffffff;
    --bmi-text-main: #0f172a;
    --bmi-text-muted: #64748b;
    --bmi-border: #e2e8f0;
    --bmi-input-bg: #f8fafc;
    
    /* Golden Ratio & Geometry (Phi ≈ 1.618) */
    --phi: 1.618;
    --base-padding: 1.5rem;
    --golden-padding: calc(var(--base-padding) * var(--phi)); /* ~2.4rem */
    --golden-gap: calc(1rem * var(--phi)); /* ~1.6rem */
    --golden-radius: 1.25rem;
    
    /* Health Colors */
    --clr-underweight: #60a5fa;
    --clr-normal: #10b981;
    --clr-overweight: #f59e0b;
    --clr-obese: #ef4444;
    --clr-morbid: #991b1b;
}

.manus-bmi-container {
    max-width: 550px;
    margin: 3rem auto;
    background: var(--bmi-bg-card);
    border-radius: calc(var(--golden-radius) * 1.5);
    box-shadow: 0 25px 60px -12px rgba(0, 0, 0, 0.06);
    font-family: 'Plus Jakarta Sans', sans-serif;
    color: var(--bmi-text-main);
    overflow: hidden;
    border: 1px solid var(--bmi-border);
}

.manus-bmi-header-wrapper {
    padding: var(--golden-padding) var(--golden-padding) calc(var(--golden-padding) / var(--phi));
    text-align: center;
}

.manus-bmi-header-wrapper h2 {
    margin: 0;
    font-size: 1.85rem;
    font-weight: 800;
    letter-spacing: -0.04em;
}

.manus-bmi-header-wrapper p {
    margin: 0.75rem 0 0;
    color: var(--bmi-text-muted);
    font-size: 1rem;
}

.manus-bmi-body {
    padding: 0 var(--golden-padding) var(--golden-padding);
}

/* Tabs */
.manus-bmi-tabs {
    display: flex;
    background: #f1f5f9;
    padding: 0.4rem;
    border-radius: var(--golden-radius);
    margin-bottom: var(--golden-gap);
}

.manus-bmi-tab {
    flex: 1;
    padding: 0.85rem;
    border: none;
    background: transparent;
    cursor: pointer;
    font-weight: 700;
    font-size: 0.95rem;
    border-radius: calc(var(--golden-radius) * 0.7);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    color: var(--bmi-text-muted);
}

.manus-bmi-tab.active {
    background: white;
    color: var(--bmi-primary);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.04);
}

/* Form Grid - Golden Ratio Spacing */
.manus-bmi-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--golden-gap);
    margin-bottom: var(--golden-gap);
}

.manus-bmi-field {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}

.manus-bmi-field label {
    font-weight: 700;
    font-size: 0.85rem;
    color: var(--bmi-text-main);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.manus-bmi-field input {
    width: 100%;
    padding: 1rem 1.25rem;
    border: 2px solid transparent;
    border-radius: var(--golden-radius);
    font-size: 1.05rem;
    font-weight: 600;
    background: var(--bmi-input-bg);
    transition: all 0.25s ease;
}

.manus-bmi-field input:focus {
    outline: none;
    border-color: var(--bmi-primary);
    background: white;
    box-shadow: 0 0 0 4px var(--bmi-primary-soft);
}

/* Advanced Segmented Control for Gender */
.gender-segmented-control {
    display: flex;
    background: var(--bmi-input-bg);
    border-radius: var(--golden-radius);
    padding: 0.35rem;
    height: 56px;
    position: relative;
    z-index: 1;
}

.gender-option {
    flex: 1;
    position: relative;
    z-index: 2;
    cursor: pointer;
}

.gender-option input {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.gender-option span {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    border-radius: calc(var(--golden-radius) * 0.7);
    font-weight: 700;
    font-size: 0.9rem;
    color: var(--bmi-text-muted);
    transition: color 0.3s ease;
    gap: 0.5rem;
}

/* The Sliding Background */
.gender-segmented-control::before {
    content: '';
    position: absolute;
    top: 0.35rem;
    left: 0.35rem;
    width: calc(50% - 0.35rem);
    height: calc(100% - 0.7rem);
    background: white;
    border-radius: calc(var(--golden-radius) * 0.7);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
    transition: transform 0.3s cubic-bezier(0.65, 0, 0.35, 1);
    z-index: 1;
}

.gender-segmented-control.female-active::before {
    transform: translateX(100%);
}

.gender-option input:checked + span {
    color: var(--bmi-primary);
}

.manus-bmi-submit {
    width: 100%;
    padding: 1.25rem;
    background: var(--bmi-primary);
    color: white;
    border: none;
    border-radius: var(--golden-radius);
    font-size: 1.1rem;
    font-weight: 800;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 12px 24px -6px rgba(37, 99, 235, 0.3);
}

.manus-bmi-submit:hover {
    background: var(--bmi-primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 20px 30px -8px rgba(37, 99, 235, 0.4);
}

/* Result Box */
.manus-bmi-result-box {
    margin-top: var(--golden-gap);
    padding: var(--golden-padding);
    background: #f8fafc;
    border-radius: var(--golden-radius);
    border: 1px solid var(--bmi-border);
    display: none;
}

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.score-display .value {
    font-size: 4rem;
    font-weight: 900;
    line-height: 1;
    letter-spacing: -0.05em;
}

.status-badge-premium {
    padding: 0.75rem 1.5rem;
    border-radius: 1rem;
    font-weight: 800;
    font-size: 1rem;
    color: white;
}

/* Meter */
.premium-meter {
    margin: 2.5rem 0;
}

.meter-track {
    position: relative;
    height: 12px;
    background: #e2e8f0;
    border-radius: 20px;
    display: flex;
    gap: 4px;
    padding: 0 2px;
    align-items: center;
}

.meter-segment {
    height: 6px;
    border-radius: 10px;
}

.seg-under { flex: 18.5; background: var(--clr-underweight); }
.seg-normal { flex: 6.5; background: var(--clr-normal); }
.seg-over { flex: 5; background: var(--clr-overweight); }
.seg-obese { flex: 5; background: var(--clr-obese); }
.seg-morbid { flex: 5; background: var(--clr-morbid); }

.meter-indicator {
    position: absolute;
    top: 50%;
    width: 24px;
    height: 24px;
    background: white;
    border: 4px solid var(--bmi-text-main);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: left 1s cubic-bezier(0.34, 1.56, 0.64, 1);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.15);
}

@media (max-width: 500px) {
    .manus-bmi-grid { grid-template-columns: 1fr; }
    .manus-bmi-container { margin: 1rem; }
    .manus-bmi-header-wrapper, .manus-bmi-body { padding: 1.5rem; }
}