/* ================================================================
   BMI-CALCULATOR.CSS  —  Premium BMI Calculator
   ================================================================ */

/* ══════════════════════════════════════════════════════════════════
   UNIT TOGGLE
══════════════════════════════════════════════════════════════════ */
.bmi-unit-toggle {
    display: inline-flex;
    align-items: center;
    background: var(--bg);
    border: 1.5px solid var(--border);
    border-radius: 50px;
    padding: .22rem;
    gap: .2rem;
    margin-bottom: 1.35rem;
}

.bmi-unit-toggle input[type="radio"] { display: none; }

.bmi-unit-toggle label {
    padding: .38rem 1rem;
    font-size: .82rem;
    font-weight: 700;
    color: var(--text-muted);
    border-radius: 50px;
    cursor: pointer;
    transition: all var(--transition);
    user-select: none;
    letter-spacing: .02em;
}

.bmi-unit-toggle input[type="radio"]:checked + label {
    background: linear-gradient(135deg, #4f46e5, #06b6d4);
    color: #fff;
    box-shadow: 0 2px 10px rgba(79,70,229,.28);
}

/* ── Input grid (height + weight side-by-side on desktop) ── */
.bmi-input-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

/* Sub-grid for feet + inch */
.bmi-height-imperial {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: .6rem;
}

.bmi-input-group { display: flex; flex-direction: column; }

.bmi-input-label {
    display: block;
    font-size: .88rem;
    font-weight: 600;
    color: var(--text-soft);
    margin-bottom: .5rem;
}

.bmi-input-unit {
    font-size: .76rem;
    font-weight: 600;
    color: var(--text-muted);
    background: var(--primary-light);
    padding: .15rem .55rem;
    border-radius: 50px;
    margin-left: .4rem;
    border: 1px solid rgba(79,70,229,.14);
}

.bmi-input-wrap { position: relative; }

.bmi-number-input {
    width: 100%;
    padding: .9rem 1rem;
    font-size: 1rem;
    font-family: inherit;
    border: 1.5px solid var(--border);
    border-radius: var(--radius);
    background: #fff;
    color: var(--text);
    transition: border-color var(--transition), box-shadow var(--transition);
    outline: none;
    -moz-appearance: textfield;
    appearance: textfield;
}
.bmi-number-input::-webkit-outer-spin-button,
.bmi-number-input::-webkit-inner-spin-button { -webkit-appearance: none; }

.bmi-number-input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3.5px rgba(79,70,229,.13);
}

.bmi-number-input[aria-invalid="true"] {
    border-color: #ef4444;
    box-shadow: 0 0 0 3px rgba(239,68,68,.1);
}

.bmi-input-error {
    display: none;
    font-size: .8rem;
    color: #ef4444;
    margin-top: .38rem;
    font-weight: 500;
}
.bmi-input-error.visible { display: block; }

/* ══════════════════════════════════════════════════════════════════
   RESULT CARD
══════════════════════════════════════════════════════════════════ */
.bmi-result-card {
    max-width: 580px;
    margin: 1.6rem auto 0;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    opacity: 0;
    transform: translateY(18px);
    transition: opacity .4s cubic-bezier(.4,0,.2,1),
                transform .4s cubic-bezier(.4,0,.2,1);
}

.bmi-result-card[hidden] { display: none; }

.bmi-result-card--visible {
    opacity: 1;
    transform: translateY(0);
}

/* Gradient accent stripe at top */
.bmi-result-card::before {
    content: '';
    display: block;
    height: 4px;
    background: linear-gradient(135deg, #4f46e5, #06b6d4);
}

.bmi-result-inner {
    padding: 2rem 2rem 1.8rem;
}

/* ── Big BMI number ── */
.bmi-result-hero {
    text-align: center;
    margin-bottom: 1.4rem;
}

.bmi-result-value {
    display: block;
    font-size: clamp(3rem, 8vw, 4.5rem);
    font-weight: 900;
    line-height: 1;
    letter-spacing: -2px;
    font-variant-numeric: tabular-nums;
    background: linear-gradient(135deg, #4f46e5, #06b6d4);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: .4rem;
}

.bmi-result-category {
    display: inline-flex;
    align-items: center;
    gap: .4rem;
    font-size: 1rem;
    font-weight: 700;
    padding: .38rem 1.2rem;
    border-radius: 50px;
    letter-spacing: .02em;
}

.bmi-cat--underweight { background: #eff6ff; color: #3b82f6; border: 1.5px solid #bfdbfe; }
.bmi-cat--normal      { background: #f0fdf4; color: #16a34a; border: 1.5px solid #bbf7d0; }
.bmi-cat--overweight  { background: #fffbeb; color: #d97706; border: 1.5px solid #fde68a; }
.bmi-cat--obese       { background: #fef2f2; color: #dc2626; border: 1.5px solid #fecaca; }

.bmi-result-desc {
    text-align: center;
    font-size: .93rem;
    color: var(--text-soft);
    margin: 1rem 0 0;
    line-height: 1.6;
}

/* ── Divider ── */
.bmi-divider {
    height: 1px;
    background: var(--border);
    margin: 1.5rem 0;
}

/* ══════════════════════════════════════════════════════════════════
   BMI SCALE BAR
══════════════════════════════════════════════════════════════════ */
.bmi-scale {
    margin: 0 0 .6rem;
}

.bmi-scale-label {
    font-size: .74rem;
    font-weight: 700;
    letter-spacing: .1em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin: 0 0 .85rem;
}

/* The colour bar */
.bmi-scale-track {
    position: relative;
    height: 12px;
    border-radius: 50px;
    background: linear-gradient(90deg,
        #3b82f6  0%,
        #3b82f6  23%,    /* underweight end ~18.5 => 23% of 40 range */
        #22c55e  23%,
        #22c55e  47.5%,  /* normal end ~25 => 47.5% */
        #f59e0b  47.5%,
        #f59e0b  72.5%,  /* overweight end ~30 => 72.5% */
        #ef4444  72.5%,
        #ef4444  100%
    );
    overflow: visible;
}

/* Indicator dot */
.bmi-scale-marker {
    position: absolute;
    top: 50%;
    transform: translate(-50%, -50%);
    width: 20px;
    height: 20px;
    background: #fff;
    border: 3px solid var(--primary);
    border-radius: 50%;
    box-shadow: 0 2px 8px rgba(0,0,0,.22);
    transition: left .45s cubic-bezier(.4,0,.2,1);
    z-index: 2;
}

/* Segment labels */
.bmi-scale-segments {
    display: grid;
    grid-template-columns: 23fr 24.5fr 25fr 27.5fr;
    margin-top: .5rem;
}

.bmi-scale-seg-label {
    font-size: .68rem;
    font-weight: 700;
    text-align: center;
    letter-spacing: .02em;
}

.bmi-scale-seg-label--underweight { color: #3b82f6; }
.bmi-scale-seg-label--normal      { color: #22c55e; }
.bmi-scale-seg-label--overweight  { color: #f59e0b; }
.bmi-scale-seg-label--obese       { color: #ef4444; }

/* Range sub-labels */
.bmi-scale-ranges {
    display: grid;
    grid-template-columns: 23fr 24.5fr 25fr 27.5fr;
    margin-top: .15rem;
    margin-bottom: .4rem;
}

.bmi-scale-range-val {
    font-size: .62rem;
    color: var(--text-muted);
    text-align: center;
}

/* ── Reset button ── */
.btn-bmi-reset {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: .4rem;
    margin-top: 1.2rem;
    width: 100%;
    padding: .72rem 1rem;
    font-size: .88rem;
    font-weight: 700;
    border-radius: var(--radius);
    cursor: pointer;
    transition: all var(--transition);
    border: 1.5px solid var(--border);
    background: var(--bg);
    color: var(--text-muted);
    letter-spacing: .01em;
}
.btn-bmi-reset:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: var(--primary-light);
}

/* ══════════════════════════════════════════════════════════════════
   HEALTH GUIDANCE CARD
══════════════════════════════════════════════════════════════════ */
.bmi-guidance {
    margin-top: 1.5rem;
    border-radius: var(--radius-lg);
    border: 1.5px solid transparent;
    padding: 1.4rem 1.5rem 1.3rem;
    transition: background .35s ease, border-color .35s ease;
    animation: guidanceFadeIn .45s cubic-bezier(.4,0,.2,1) both;
}

@keyframes guidanceFadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* Category colour themes */
.bmi-guidance--underweight { background: #eff6ff; border-color: #bfdbfe; }
.bmi-guidance--normal      { background: #f0fdf4; border-color: #bbf7d0; }
.bmi-guidance--overweight  { background: #fffbeb; border-color: #fde68a; }
.bmi-guidance--obese       { background: #fef2f2; border-color: #fecaca; }

/* Header row: icon + title */
.bmi-guidance-header {
    display: flex;
    align-items: center;
    gap: .55rem;
    margin-bottom: .8rem;
}

.bmi-guidance-icon {
    font-size: 1.45rem;
    line-height: 1;
}

.bmi-guidance-title {
    font-size: 1rem;
    font-weight: 800;
    color: var(--text);
    margin: 0;
    letter-spacing: .01em;
}

/* Main message */
.bmi-guidance-message {
    font-size: .95rem;
    font-weight: 600;
    color: var(--text);
    margin: 0 0 .9rem;
    line-height: 1.5;
}

/* Tips list */
.bmi-guidance-list {
    list-style: none;
    margin: 0 0 1rem;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: .5rem;
}

.bmi-guidance-item {
    display: flex;
    align-items: flex-start;
    gap: .55rem;
    font-size: .9rem;
    color: var(--text-soft);
    line-height: 1.55;
}

.bmi-guidance-check {
    flex-shrink: 0;
    font-size: .8rem;
    font-weight: 900;
    margin-top: .18rem;
    width: 1.1rem;
    height: 1.1rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: rgba(0,0,0,.07);
}

.bmi-guidance--normal      .bmi-guidance-check { background: #dcfce7; color: #16a34a; }
.bmi-guidance--underweight .bmi-guidance-check { background: #dbeafe; color: #3b82f6; }
.bmi-guidance--overweight  .bmi-guidance-check { background: #fef3c7; color: #d97706; }
.bmi-guidance--obese       .bmi-guidance-check { background: #fee2e2; color: #dc2626; }

/* Ideal weight bar */
.bmi-guidance-ideal {
    font-size: .82rem;
    color: var(--text-soft);
    background: rgba(255,255,255,.65);
    border-radius: var(--radius);
    padding: .55rem .85rem;
    margin-bottom: .9rem;
    line-height: 1.6;
    border: 1px solid rgba(0,0,0,.06);
}

.bmi-guidance-ideal-label {
    color: var(--text-muted);
    font-weight: 600;
}

/* Disclaimer */
.bmi-guidance-disclaimer {
    font-size: .78rem;
    color: var(--text-muted);
    line-height: 1.55;
    margin: 0;
    padding-top: .8rem;
    border-top: 1px solid rgba(0,0,0,.08);
}

/* ══════════════════════════════════════════════════════════════════
   RESPONSIVE
══════════════════════════════════════════════════════════════════ */
@media (max-width: 540px) {
    .bmi-input-grid { grid-template-columns: 1fr; }

    .tool-card,
    .bmi-result-card { border-radius: var(--radius-lg); }

    .bmi-result-inner { padding: 1.5rem 1.1rem 1.4rem; }

    /* Sponsor: 1 column on mobile */
    .sponsor-grid { grid-template-columns: 1fr; }
}

@media (min-width: 541px) and (max-width: 860px) {
    .sponsor-grid { grid-template-columns: repeat(2, 1fr); }
}