/* ===== BMI Calculator Pro – Frontend Styles ===== */

.bmi-calc-wrapper {
    --bmi-primary: #3B82F6;
    --bmi-btn: #10B981;
    --bmi-card-bg: #ffffff;
    --bmi-radius: 16px;
    --bmi-font: inherit;
    --bmi-border: #E5E7EB;
    --bmi-text: #1F2937;
    --bmi-muted: #6B7280;
    --bmi-input-bg: #F9FAFB;
    font-family: var(--bmi-font);
    max-width: 560px;
    margin: 0 auto;
    padding: 16px;
}

.bmi-calc-card {
    background: var(--bmi-card-bg);
    border-radius: var(--bmi-radius);
    box-shadow: 0 4px 24px rgba(0,0,0,.08), 0 1px 4px rgba(0,0,0,.04);
    padding: 32px;
}

.bmi-calc-title {
    color: var(--bmi-primary);
    font-size: 22px;
    font-weight: 700;
    margin: 0 0 6px;
}

.bmi-calc-subtitle {
    color: var(--bmi-muted);
    font-size: 14px;
    margin: 0 0 24px;
}

/* Divider after subtitle */
.bmi-calc-card > .bmi-calc-subtitle { border-bottom: 1px solid var(--bmi-border); padding-bottom: 20px; }

/* Label */
.bmi-label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--bmi-text);
    margin-bottom: 8px;
    letter-spacing: .3px;
}

/* Gender toggle */
.bmi-field-group { margin-bottom: 20px; }

.bmi-gender-toggle {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

.bmi-gender-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    padding: 14px;
    border: 2px solid var(--bmi-border);
    border-radius: calc(var(--bmi-radius) - 4px);
    background: var(--bmi-input-bg);
    color: var(--bmi-muted);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all .2s ease;
}

.bmi-gender-btn svg {
    width: 28px; height: 28px;
    transition: all .2s ease;
}

.bmi-gender-btn:hover {
    border-color: var(--bmi-primary);
    color: var(--bmi-primary);
}

.bmi-gender-btn.active {
    border-color: var(--bmi-primary);
    background: color-mix(in srgb, var(--bmi-primary) 10%, white);
    color: var(--bmi-primary);
}

/* Row layout */
.bmi-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 16px;
}

/* Input */
.bmi-input-wrap {
    display: flex;
    align-items: center;
    border: 1.5px solid var(--bmi-border);
    border-radius: calc(var(--bmi-radius) - 6px);
    background: var(--bmi-input-bg);
    overflow: hidden;
    transition: border-color .2s;
}

.bmi-input-wrap:focus-within {
    border-color: var(--bmi-primary);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--bmi-primary) 15%, transparent);
}

.bmi-input {
    flex: 1;
    border: none;
    background: transparent;
    padding: 10px 12px;
    font-size: 15px;
    color: var(--bmi-text);
    outline: none;
    width: 100%;
    min-width: 0;
}

.bmi-input::placeholder { color: #C9CDD4; }

.bmi-unit {
    padding: 0 12px;
    font-size: 13px;
    color: var(--bmi-muted);
    font-weight: 500;
    border-left: 1px solid var(--bmi-border);
    background: #F3F4F6;
    align-self: stretch;
    display: flex;
    align-items: center;
    white-space: nowrap;
}

/* Button */
.bmi-calc-btn {
    width: 100%;
    padding: 15px;
    background: var(--bmi-btn);
    color: #fff;
    border: none;
    border-radius: calc(var(--bmi-radius) - 4px);
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
    margin-top: 8px;
    margin-bottom: 0;
    letter-spacing: .3px;
    transition: filter .2s, transform .15s;
}

.bmi-calc-btn:hover { filter: brightness(1.08); transform: translateY(-1px); }
.bmi-calc-btn:active { transform: translateY(0); filter: brightness(.96); }

/* Result */
.bmi-result {
    background: color-mix(in srgb, var(--bmi-primary) 8%, white);
    border: 1.5px solid color-mix(in srgb, var(--bmi-primary) 25%, white);
    border-radius: calc(var(--bmi-radius) - 4px);
    padding: 18px 20px;
    margin-top: 20px;
    animation: bmiSlideIn .3s ease;
}

@keyframes bmiSlideIn {
    from { opacity: 0; transform: translateY(8px); }
    to   { opacity: 1; transform: translateY(0); }
}

.bmi-result-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 8px;
}

.bmi-result-label {
    font-size: 14px;
    font-weight: 600;
    color: var(--bmi-muted);
}

.bmi-result-value {
    font-size: 32px;
    font-weight: 800;
    color: var(--bmi-primary);
}

.bmi-result-category {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 6px;
}

.bmi-result-tip {
    font-size: 13px;
    color: var(--bmi-muted);
    line-height: 1.5;
}

/* Scale */
.bmi-scale-section { margin-top: 24px; }

.bmi-scale-label {
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 1px;
    color: var(--bmi-muted);
    margin-bottom: 8px;
}

.bmi-scale-bar {
    height: 10px;
    border-radius: 99px;
    background: linear-gradient(to right, #60A5FA 0%, #34D399 30%, #FBBF24 60%, #EF4444 100%);
    position: relative;
    margin-bottom: 12px;
}

.bmi-scale-indicator {
    position: absolute;
    top: 50%;
    transform: translate(-50%, -50%);
    width: 18px;
    height: 18px;
    background: #fff;
    border: 3px solid var(--bmi-text);
    border-radius: 50%;
    box-shadow: 0 2px 6px rgba(0,0,0,.2);
    transition: left .5s cubic-bezier(.34,1.56,.64,1);
}

.bmi-scale-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 16px;
    font-size: 11px;
    color: var(--bmi-muted);
}

.bmi-dot {
    display: inline-block;
    width: 8px; height: 8px;
    border-radius: 50%;
    margin-right: 4px;
    vertical-align: middle;
}

/* Responsive */
@media (max-width: 480px) {
    .bmi-calc-card { padding: 20px 16px; }
    .bmi-row { grid-template-columns: 1fr; }
    .bmi-scale-legend { font-size: 10px; gap: 6px 10px; }
}