/* ═══════════════════════════════════════════════════════════════════════════
   style.css — Ultra-Modern Premium Health-Tech BMI Calculator
   Design System: Dark Navy • Glassmorphism • Neon Cyan Accents
   Version: 3.0 — Fully Responsive Result Section Overhaul
   ═══════════════════════════════════════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@300;400;500;600;700;800&display=swap');

/* ═══════════════════════════════════════════════════════════════════════════
   1. ROOT DESIGN TOKENS
   ═══════════════════════════════════════════════════════════════════════════ */
:root {
    /* ── Core Background ── */
    --bg-deep: #060B14;
    --bg-surface: #0B1322;
    --bg-elevated: #0F1A2E;
    --bg-glass: rgba(15, 26, 46, 0.55);
    --bg-glass-strong: rgba(15, 26, 46, 0.75);
    --bg-glass-light: rgba(255, 255, 255, 0.03);

    /* ── Accent Palette ── */
    --accent-cyan: #22D3EE;
    --accent-cyan-soft: #67E8F9;
    --accent-cyan-glow: rgba(34, 211, 238, 0.4);
    --accent-purple: #A78BFA;
    --accent-purple-soft: #C4B5FD;
    --accent-purple-glow: rgba(167, 139, 250, 0.35);
    --accent-blue: #3B82F6;
    --accent-indigo: #6366F1;

    /* ── Semantic Colors ── */
    --color-success: #34D399;
    --color-success-bg: rgba(52, 211, 153, 0.08);
    --color-warning: #FBBF24;
    --color-warning-bg: rgba(251, 191, 36, 0.08);
    --color-danger: #F87171;
    --color-danger-bg: rgba(248, 113, 113, 0.08);
    --color-info: #60A5FA;
    --color-info-bg: rgba(96, 165, 250, 0.08);

    /* ── BMI Category Colors ── */
    --bmi-underweight: #60A5FA;
    --bmi-underweight-bg: rgba(96, 165, 250, 0.12);
    --bmi-normal: #34D399;
    --bmi-normal-bg: rgba(52, 211, 153, 0.12);
    --bmi-overweight: #FBBF24;
    --bmi-overweight-bg: rgba(251, 191, 36, 0.12);
    --bmi-obese: #F87171;
    --bmi-obese-bg: rgba(248, 113, 113, 0.12);

    /* ── Text ── */
    --text-primary: #F1F5F9;
    --text-secondary: #94A3B8;
    --text-muted: #64748B;
    --text-inverse: #0B1322;

    /* ── Borders ── */
    --border-subtle: rgba(255, 255, 255, 0.06);
    --border-medium: rgba(255, 255, 255, 0.1);
    --border-strong: rgba(255, 255, 255, 0.18);
    --border-glow-cyan: rgba(34, 211, 238, 0.3);
    --border-glow-purple: rgba(167, 139, 250, 0.25);

    /* ── Shadows ── */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 24px 56px rgba(0, 0, 0, 0.55);
    --shadow-glow-cyan: 0 0 30px rgba(34, 211, 238, 0.2);
    --shadow-glow-purple: 0 0 30px rgba(167, 139, 250, 0.18);
    --shadow-button: 0 8px 24px rgba(34, 211, 238, 0.3);
    --shadow-card-hover: 0 28px 60px rgba(0, 0, 0, 0.6), 0 0 40px rgba(34, 211, 238, 0.08);

    /* ── Radii ── */
    --radius-xs: 6px;
    --radius-sm: 10px;
    --radius-md: 16px;
    --radius-lg: 22px;
    --radius-xl: 28px;
    --radius-2xl: 32px;
    --radius-full: 9999px;

    /* ── Typography ── */
    --font-primary: 'Plus Jakarta Sans', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'SF Mono', 'JetBrains Mono', 'Fira Code', monospace;
    --font-weight-light: 300;
    --font-weight-regular: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --font-weight-extrabold: 800;

    /* ── Transitions ── */
    --transition-fast: 0.18s cubic-bezier(0.25, 0, 0.25, 1);
    --transition-smooth: 0.28s cubic-bezier(0.25, 0, 0.25, 1);
    --transition-spring: 0.45s cubic-bezier(0.16, 1, 0.3, 1);
    --transition-slow: 0.6s cubic-bezier(0.16, 1, 0.3, 1);

    /* ── Blur ── */
    --blur-glass: 24px;
    --blur-glass-heavy: 40px;
    --blur-glass-light: 12px;
}

/* ═══════════════════════════════════════════════════════════════════════════
   2. CSS RESET & BASE
   ═══════════════════════════════════════════════════════════════════════════ */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: var(--font-primary);
    background: var(--bg-deep);
    background-image:
        radial-gradient(ellipse at 15% 20%, rgba(34, 211, 238, 0.04) 0%, transparent 55%),
        radial-gradient(ellipse at 75% 60%, rgba(167, 139, 250, 0.04) 0%, transparent 55%),
        radial-gradient(ellipse at 50% 85%, rgba(99, 102, 241, 0.03) 0%, transparent 50%);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.55;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    display: flex;
    justify-content: center;
    padding: 0;
    overflow-x: hidden;
    position: relative;
}

/* ═══════════════════════════════════════════════════════════════════════════
   3. BACKGROUND ORBS — ANIMATED AMBIENT GLOW
   ═══════════════════════════════════════════════════════════════════════════ */
.bg-orb {
    position: fixed;
    border-radius: 50%;
    filter: blur(130px);
    pointer-events: none;
    z-index: 0;
    will-change: transform;
    animation: orbFloat 20s ease-in-out infinite;
}
.bg-orb--1 {
    width: clamp(300px, 50vw, 560px);
    height: clamp(300px, 50vw, 560px);
    background: radial-gradient(circle, rgba(34, 211, 238, 0.18) 0%, transparent 70%);
    top: -15%;
    left: -10%;
    animation-delay: 0s;
}
.bg-orb--2 {
    width: clamp(250px, 40vw, 460px);
    height: clamp(250px, 40vw, 460px);
    background: radial-gradient(circle, rgba(167, 139, 250, 0.15) 0%, transparent 70%);
    bottom: -12%;
    right: -8%;
    animation-delay: -7s;
    animation-duration: 24s;
}
.bg-orb--3 {
    width: clamp(200px, 35vw, 340px);
    height: clamp(200px, 35vw, 340px);
    background: radial-gradient(circle, rgba(99, 102, 241, 0.12) 0%, transparent 70%);
    top: 55%;
    left: 55%;
    transform: translate(-50%, -50%);
    animation-delay: -14s;
    animation-duration: 18s;
}
@keyframes orbFloat {
    0%, 100% { transform: translate(0, 0) scale(1); }
    25% { transform: translate(30px, -40px) scale(1.06); }
    50% { transform: translate(-20px, 25px) scale(0.94); }
    75% { transform: translate(-35px, -15px) scale(1.04); }
}

.bg-grid {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.025) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.025) 1px, transparent 1px);
    background-size: clamp(40px, 8vw, 72px) clamp(40px, 8vw, 72px);
    mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
}

/* ═══════════════════════════════════════════════════════════════════════════
   4. MAIN CONTAINER
   ═══════════════════════════════════════════════════════════════════════════ */
.main-container {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: 660px;
    padding: clamp(14px, 4vw, 24px) clamp(14px, 4vw, 24px) clamp(28px, 6vw, 52px);
    display: flex;
    flex-direction: column;
    gap: clamp(18px, 4.5vw, 28px);
}

/* ═══════════════════════════════════════════════════════════════════════════
   5. HEADER
   ═══════════════════════════════════════════════════════════════════════════ */
.header {
    text-align: center;
    padding: clamp(6px, 2vw, 10px) 4px 0;
}
.header__badge {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    background: var(--bg-glass-light);
    backdrop-filter: blur(var(--blur-glass));
    -webkit-backdrop-filter: blur(var(--blur-glass));
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-full);
    padding: clamp(5px, 1.4vw, 7px) clamp(14px, 3vw, 20px);
    font-size: clamp(0.68rem, 1.8vw, 0.8rem);
    font-weight: var(--font-weight-semibold);
    color: var(--text-secondary);
    margin-bottom: clamp(10px, 2.5vw, 14px);
    letter-spacing: -0.01em;
    transition: border-color var(--transition-smooth);
}
.header__badge:hover {
    border-color: var(--border-medium);
}
.header__badge-dot {
    width: 6px;
    height: 6px;
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
    border-radius: 50%;
    box-shadow: 0 0 10px var(--accent-cyan-glow);
    animation: dotPulse 2.5s ease-in-out infinite;
}
@keyframes dotPulse {
    0%, 100% { box-shadow: 0 0 8px var(--accent-cyan-glow); }
    50% { box-shadow: 0 0 18px rgba(34, 211, 238, 0.7); }
}
.header__title {
    font-size: clamp(1.35rem, 4.5vw, 2rem);
    font-weight: var(--font-weight-extrabold);
    letter-spacing: -0.03em;
    color: var(--text-primary);
    line-height: 1.15;
    margin-bottom: clamp(6px, 1.8vw, 10px);
}
.header__title-highlight {
    background: linear-gradient(135deg, var(--accent-cyan) 0%, var(--accent-cyan-soft) 35%, var(--accent-purple) 70%, var(--accent-purple-soft) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    filter: drop-shadow(0 2px 8px rgba(34, 211, 238, 0.3));
}
.header__subtitle {
    font-size: clamp(0.78rem, 2.2vw, 0.92rem);
    color: var(--text-secondary);
    max-width: 400px;
    margin: 0 auto;
    font-weight: var(--font-weight-regular);
    letter-spacing: -0.005em;
}

/* ═══════════════════════════════════════════════════════════════════════════
   6. CALCULATOR CARD — GLASS CONTAINER
   ═══════════════════════════════════════════════════════════════════════════ */
.calculator-card {
    background: var(--bg-glass);
    backdrop-filter: blur(var(--blur-glass-heavy));
    -webkit-backdrop-filter: blur(var(--blur-glass-heavy));
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-2xl);
    padding: clamp(18px, 4.5vw, 28px) clamp(16px, 4vw, 26px);
    box-shadow: var(--shadow-xl);
    transition: border-color var(--transition-smooth), box-shadow var(--transition-smooth);
    position: relative;
    overflow: hidden;
}
.calculator-card::after {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    pointer-events: none;
    background: linear-gradient(180deg, rgba(255,255,255,0.03) 0%, transparent 40%, rgba(34,211,238,0.02) 100%);
    z-index: -1;
}
.calculator-card:focus-within {
    border-color: var(--border-glow-cyan);
    box-shadow: var(--shadow-xl), 0 0 0 4px rgba(34, 211, 238, 0.06);
}

/* ── Unit Toggle Row ── */
.unit-toggle-row {
    display: flex;
    gap: clamp(10px, 2.5vw, 18px);
    margin-bottom: clamp(16px, 4vw, 24px);
    flex-wrap: wrap;
}
.unit-toggle-group {
    display: flex;
    align-items: center;
    gap: 2px;
    background: rgba(255, 255, 255, 0.03);
    border-radius: var(--radius-full);
    padding: 3px;
    backdrop-filter: blur(var(--blur-glass-light));
    -webkit-backdrop-filter: blur(var(--blur-glass-light));
    border: 1px solid var(--border-subtle);
}
.unit-toggle__label {
    font-size: clamp(0.68rem, 1.8vw, 0.76rem);
    font-weight: var(--font-weight-semibold);
    color: var(--text-secondary);
    margin: 0 clamp(4px, 1.5vw, 10px) 0 clamp(4px, 1.5vw, 8px);
    white-space: nowrap;
}
.unit-toggle__btn {
    border: none;
    background: transparent;
    font-size: clamp(0.68rem, 1.8vw, 0.76rem);
    font-weight: var(--font-weight-semibold);
    padding: clamp(5px, 1.5vw, 7px) clamp(10px, 2.5vw, 15px);
    border-radius: var(--radius-full);
    cursor: pointer;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
    white-space: nowrap;
    font-family: var(--font-primary);
}
.unit-toggle__btn.active {
    background: rgba(255, 255, 255, 0.1);
    color: #fff;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}
.unit-toggle__btn:hover:not(.active) {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.04);
}

/* ── Form Fields ── */
.bmi-form {
    display: flex;
    flex-direction: column;
    gap: clamp(12px, 3vw, 16px);
}
.form-field {
    display: flex;
    flex-direction: column;
    gap: 5px;
}
.form-field--hidden {
    display: none;
}
.form-field__label {
    font-size: clamp(0.73rem, 2vw, 0.82rem);
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
    letter-spacing: -0.01em;
}
.form-field__input {
    width: 100%;
    padding: clamp(10px, 2.4vw, 13px) clamp(13px, 3vw, 17px);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--radius-md);
    font-size: clamp(0.88rem, 2.4vw, 1rem);
    font-family: var(--font-primary);
    background: rgba(255, 255, 255, 0.04);
    color: #fff;
    transition: all var(--transition-fast);
    outline: none;
    -moz-appearance: textfield;
    backdrop-filter: blur(var(--blur-glass-light));
    -webkit-backdrop-filter: blur(var(--blur-glass-light));
}
.form-field__input::placeholder {
    color: var(--text-muted);
    opacity: 0.7;
}
.form-field__input::-webkit-outer-spin-button,
.form-field__input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}
.form-field__input:focus {
    border-color: var(--accent-cyan);
    box-shadow: 0 0 0 4px rgba(34, 211, 238, 0.08), 0 0 18px rgba(34, 211, 238, 0.1);
    background: rgba(255, 255, 255, 0.06);
}
.form-field__hint {
    font-size: clamp(0.62rem, 1.6vw, 0.7rem);
    color: var(--text-muted);
    letter-spacing: 0.01em;
}
.form-field__dual {
    display: flex;
    gap: clamp(8px, 2vw, 12px);
}
.form-field__dual-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 2px;
}
.form-row {
    display: flex;
    gap: clamp(10px, 2.5vw, 16px);
}
.form-field--half {
    flex: 1;
}

/* ── Gender Toggle ── */
.gender-toggle {
    display: flex;
    gap: clamp(8px, 2vw, 10px);
}
.gender-toggle__btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: clamp(4px, 1.5vw, 7px);
    padding: clamp(9px, 2.2vw, 12px) clamp(8px, 2vw, 12px);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.03);
    font-size: clamp(0.78rem, 2vw, 0.88rem);
    font-weight: var(--font-weight-semibold);
    cursor: pointer;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
    backdrop-filter: blur(var(--blur-glass-light));
    -webkit-backdrop-filter: blur(var(--blur-glass-light));
    font-family: var(--font-primary);
}
.gender-toggle__btn svg {
  width: 1.72em;
  height: 1.72em;
  flex-shrink: 0;
  vertical-align: -0.125em; /* subtle optical alignment */
  display: inline-block;
  opacity: inherit;
  transition: opacity 0.2s ease, transform 0.2s ease;
}
.gender-toggle__btn:hover {
    border-color: rgba(255, 255, 255, 0.2);
    color: #fff;
    background: rgba(255, 255, 255, 0.06);
}
.gender-toggle__btn:hover svg {
    opacity: 1;
}
.gender-toggle__btn[aria-pressed="true"] {
    background: rgba(34, 211, 238, 0.1);
    border-color: var(--accent-cyan);
    color: #fff;
    box-shadow: 0 0 16px rgba(34, 211, 238, 0.2);
}
.gender-toggle__btn[aria-pressed="true"] svg {
    opacity: 1;
    color: var(--accent-cyan);
}

/* ── Action Buttons ── */
.form-actions {
    display: flex;
    gap: clamp(8px, 2vw, 12px);
    margin-top: clamp(6px, 2vw, 10px);
}
.btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: clamp(6px, 1.5vw, 9px);
    padding: clamp(11px, 2.8vw, 15px) clamp(14px, 3vw, 20px);
    border: none;
    border-radius: var(--radius-full);
    font-size: clamp(0.84rem, 2.4vw, 0.96rem);
    font-weight: var(--font-weight-bold);
    cursor: pointer;
    transition: all var(--transition-smooth);
    letter-spacing: -0.01em;
    font-family: var(--font-primary);
    position: relative;
    overflow: hidden;
}
.btn--primary {
    background: linear-gradient(135deg, #22D3EE 0%, #6366F1 100%);
    color: #060B14;
    box-shadow: var(--shadow-button);
}
.btn--primary::after {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    background: linear-gradient(135deg, rgba(255,255,255,0.25) 0%, transparent 50%);
    pointer-events: none;
}
.btn--primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 14px 32px rgba(34, 211, 238, 0.45);
}
.btn--primary:active {
    transform: translateY(0);
    box-shadow: 0 6px 16px rgba(34, 211, 238, 0.3);
}
.btn--secondary {
    background: rgba(255, 255, 255, 0.04);
    color: var(--text-primary);
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(var(--blur-glass-light));
    -webkit-backdrop-filter: blur(var(--blur-glass-light));
}
.btn--secondary:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.2);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25);
}

#resetBtn svg {
  width: 1em;
  height: 1em;
  vertical-align: -0.1em;   /* optical baseline alignment */
  flex-shrink: 0;
  display: inline-block;
}


/* ── Error Message ── */
.error-message {
    display: flex;
    align-items: center;
    gap: clamp(7px, 2vw, 10px);
    margin-top: clamp(8px, 2vw, 12px);
    padding: clamp(9px, 2vw, 12px) clamp(13px, 3vw, 17px);
    background: var(--color-danger-bg);
    backdrop-filter: blur(var(--blur-glass));
    -webkit-backdrop-filter: blur(var(--blur-glass));
    border: 1px solid rgba(248, 113, 113, 0.2);
    border-radius: var(--radius-sm);
    color: #FCA5A5;
    font-size: clamp(0.76rem, 2vw, 0.85rem);
    font-weight: var(--font-weight-medium);
}
.error-message[hidden] {
    display: none;
}

/* ═══════════════════════════════════════════════════════════════════════════
   7. RESULTS SECTION — ULTRA-PREMIUM REDESIGN
   ═══════════════════════════════════════════════════════════════════════════ */
.results-section {
    display: flex;
    flex-direction: column;
    gap: clamp(16px, 4vw, 22px);
}
.results-section[hidden] {
    display: none;
}

/* ── Result Card ── */
.result-card {
    background: var(--bg-glass-strong);
    backdrop-filter: blur(var(--blur-glass-heavy));
    -webkit-backdrop-filter: blur(var(--blur-glass-heavy));
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-2xl);
    padding: clamp(20px, 5vw, 32px) clamp(18px, 4vw, 28px);
    box-shadow: var(--shadow-xl);
    animation: resultReveal 0.55s cubic-bezier(0.16, 1, 0.3, 1) forwards;
    position: relative;
    overflow: hidden;
    transition: box-shadow var(--transition-smooth);
}
.result-card:hover {
    box-shadow: var(--shadow-card-hover);
}

/* Gradient border glow — top edge accent */
.result-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg,
        transparent 0%,
        var(--accent-cyan) 15%,
        var(--accent-purple) 50%,
        var(--accent-cyan) 85%,
        transparent 100%
    );
    opacity: 0.8;
    z-index: 2;
    animation: borderGlow 4s ease-in-out infinite;
}
@keyframes borderGlow {
    0%, 100% { opacity: 0.6; }
    50% { opacity: 1; }
}

/* Subtle inner glow */
.result-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60%;
    height: 200px;
    background: radial-gradient(ellipse at center, rgba(34, 211, 238, 0.06) 0%, transparent 70%);
    pointer-events: none;
    z-index: 0;
}

@keyframes resultReveal {
    from {
        opacity: 0;
        transform: translateY(24px) scale(0.97);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* ── Result Card Header ── */
.result-card__header {
    display: flex;
    align-items: center;
    gap: clamp(8px, 2vw, 14px);
    margin-bottom: clamp(16px, 4vw, 22px);
    position: relative;
    z-index: 1;
}
.result-card__badge {
    background: rgba(34, 211, 238, 0.08);
    color: var(--accent-cyan-soft);
    padding: clamp(4px, 1vw, 6px) clamp(10px, 2.5vw, 16px);
    border-radius: var(--radius-full);
    font-size: clamp(0.7rem, 1.8vw, 0.76rem);
    font-weight: var(--font-weight-bold);
    border: 1px solid rgba(34, 211, 238, 0.2);
    backdrop-filter: blur(var(--blur-glass-light));
    -webkit-backdrop-filter: blur(var(--blur-glass-light));
    letter-spacing: 0.01em;
}
.result-card__title {
    font-size: clamp(0.95rem, 2.8vw, 1.12rem);
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

/* ── BMI Score Display ── */
.bmi-score-display {
    text-align: center;
    padding: clamp(10px, 3vw, 18px) 0 clamp(6px, 2vw, 10px);
    position: relative;
    z-index: 1;
}
.bmi-score-display__value {
    font-size: clamp(3rem, 9vw, 5.5rem);
    font-weight: var(--font-weight-extrabold);
    line-height: 1;
    letter-spacing: -0.05em;
    background: linear-gradient(180deg, #FFFFFF 0%, #BAE6FD 50%, #67E8F9 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    filter: drop-shadow(0 4px 16px rgba(34, 211, 238, 0.35));
    transition: all var(--transition-spring);
}
.bmi-score-display__unit {
    font-size: clamp(0.76rem, 2.2vw, 0.9rem);
    color: var(--text-secondary);
    margin-top: clamp(2px, 0.8vw, 6px);
    font-weight: var(--font-weight-medium);
    letter-spacing: 0.02em;
}
.bmi-score-display__category {
    display: inline-block;
    margin-top: clamp(8px, 2vw, 14px);
    padding: clamp(6px, 1.8vw, 9px) clamp(16px, 4vw, 24px);
    border-radius: var(--radius-full);
    font-size: clamp(0.78rem, 2.3vw, 0.9rem);
    font-weight: var(--font-weight-bold);
    backdrop-filter: blur(var(--blur-glass));
    -webkit-backdrop-filter: blur(var(--blur-glass));
    letter-spacing: -0.005em;
    transition: all var(--transition-smooth);
}

/* ── BMI Scale / Meter ── */
.bmi-scale {
    margin: clamp(16px, 4vw, 22px) 0 clamp(18px, 4vw, 26px);
    position: relative;
    z-index: 1;
}
.bmi-scale__bar {
    display: flex;
    height: clamp(8px, 2vw, 10px);
    border-radius: 10px;
    overflow: hidden;
    background: rgba(255, 255, 255, 0.05);
    position: relative;
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.3);
}
.bmi-scale__segment {
    height: 100%;
    transition: filter var(--transition-smooth);
}
.bmi-scale__segment--underweight {
    background: linear-gradient(90deg, #60A5FA, #3B82F6);
}
.bmi-scale__segment--normal {
    background: linear-gradient(90deg, #34D399, #10B981);
}
.bmi-scale__segment--overweight {
    background: linear-gradient(90deg, #FCD34D, #F59E0B);
}
.bmi-scale__segment--obese {
    background: linear-gradient(90deg, #FCA5A5, #EF4444);
}
.bmi-scale__marker {
    position: absolute;
    top: clamp(-5px, -1vw, -3px);
    transform: translateX(-50%);
    width: clamp(17px, 4vw, 22px);
    height: clamp(17px, 4vw, 22px);
    background: #FFFFFF;
    border: 3px solid #0F1A2E;
    border-radius: 50%;
    box-shadow:
        0 0 0 5px rgba(255, 255, 255, 0.2),
        0 0 20px rgba(34, 211, 238, 0.5),
        0 4px 12px rgba(0, 0, 0, 0.4);
    z-index: 2;
    transition: left 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}
.bmi-scale__marker-arrow {
    display: none;
}
.bmi-scale__labels {
    display: flex;
    justify-content: space-between;
    font-size: clamp(0.6rem, 1.6vw, 0.68rem);
    color: var(--text-muted);
    margin-top: clamp(6px, 1.8vw, 10px);
    padding: 0 2px;
    font-weight: var(--font-weight-medium);
}
.bmi-scale__legend {
    display: flex;
    justify-content: center;
    gap: clamp(8px, 2.5vw, 18px);
    margin-top: clamp(10px, 2.5vw, 14px);
    flex-wrap: wrap;
    font-size: clamp(0.66rem, 1.8vw, 0.74rem);
    color: var(--text-secondary);
}
.bmi-scale__legend-item {
    display: flex;
    align-items: center;
    gap: 5px;
    font-weight: var(--font-weight-medium);
}
.bmi-scale__legend-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    box-shadow: 0 0 6px currentColor;
}
.bmi-scale__legend-dot--underweight { background: #3B82F6; color: #3B82F6; }
.bmi-scale__legend-dot--normal { background: #10B981; color: #10B981; }
.bmi-scale__legend-dot--overweight { background: #F59E0B; color: #F59E0B; }
.bmi-scale__legend-dot--obese { background: #EF4444; color: #EF4444; }

/* ── Report Details Grid ── */
.report-details {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(clamp(130px, 40vw, 180px), 1fr));
    gap: clamp(10px, 2.5vw, 14px);
    margin-bottom: clamp(16px, 4vw, 22px);
    position: relative;
    z-index: 1;
}
.report-detail-item {
    display: flex;
    gap: clamp(6px, 2vw, 10px);
    padding: clamp(11px, 2.8vw, 15px) clamp(10px, 2.5vw, 14px);
    background: rgba(255, 255, 255, 0.025);
    border-radius: var(--radius-md);
    border: 1px solid rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(var(--blur-glass-light));
    -webkit-backdrop-filter: blur(var(--blur-glass-light));
    transition: all var(--transition-smooth);
    align-items: flex-start;
}
.report-detail-item:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.1);
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
}
.report-detail-item__icon {
    font-size: clamp(1.1rem, 2.8vw, 1.3rem);
    flex-shrink: 0;
    margin-top: 1px;
}
.report-detail-item__label {
    display: block;
    font-size: clamp(0.63rem, 1.6vw, 0.68rem);
    font-weight: var(--font-weight-bold);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--text-muted);
}
.report-detail-item__value {
    display: block;
    font-size: clamp(0.78rem, 2vw, 0.9rem);
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
    margin-top: 2px;
    line-height: 1.3;
}

/* ── Lifestyle Tips ── */
.lifestyle-tips {
    background: rgba(52, 211, 153, 0.05);
    border-radius: var(--radius-lg);
    padding: clamp(14px, 3vw, 18px) clamp(14px, 3vw, 18px);
    margin-bottom: clamp(12px, 3vw, 16px);
    border: 1px solid rgba(52, 211, 153, 0.12);
    backdrop-filter: blur(var(--blur-glass));
    -webkit-backdrop-filter: blur(var(--blur-glass));
    position: relative;
    z-index: 1;
    transition: all var(--transition-smooth);
}
.lifestyle-tips:hover {
    border-color: rgba(52, 211, 153, 0.22);
    box-shadow: 0 0 20px rgba(52, 211, 153, 0.06);
}
.lifestyle-tips__title {
    font-size: clamp(0.8rem, 2.3vw, 0.88rem);
    font-weight: var(--font-weight-bold);
    margin-bottom: clamp(8px, 2vw, 11px);
    color: #6EE7B7;
    letter-spacing: -0.005em;
}
.lifestyle-tips__list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: clamp(5px, 1.5vw, 7px);
}
.lifestyle-tips__list li {
    font-size: clamp(0.76rem, 2vw, 0.83rem);
    color: var(--text-secondary);
    padding-left: clamp(16px, 3vw, 20px);
    position: relative;
    line-height: 1.45;
}
.lifestyle-tips__list li::before {
    content: '•';
    position: absolute;
    left: 3px;
    color: #34D399;
    font-weight: var(--font-weight-bold);
    font-size: 1.1rem;
    line-height: 1.3;
}

/* ── Motivational Message ── */
.motivational-message {
    background: rgba(167, 139, 250, 0.05);
    border-radius: var(--radius-lg);
    padding: clamp(14px, 3vw, 18px) clamp(14px, 3vw, 18px);
    text-align: center;
    font-size: clamp(0.8rem, 2.2vw, 0.9rem);
    font-weight: var(--font-weight-semibold);
    color: #C4B5FD;
    border: 1px solid rgba(167, 139, 250, 0.12);
    backdrop-filter: blur(var(--blur-glass));
    -webkit-backdrop-filter: blur(var(--blur-glass));
    position: relative;
    z-index: 1;
    transition: all var(--transition-smooth);
}
.motivational-message:hover {
    border-color: rgba(167, 139, 250, 0.22);
    box-shadow: 0 0 20px rgba(167, 139, 250, 0.06);
}

/* ═══════════════════════════════════════════════════════════════════════════
   8. SEO CONTENT
   ═══════════════════════════════════════════════════════════════════════════ */
.seo-content {
    padding: clamp(8px, 2vw, 12px) 4px;
}
.seo-content__title {
    font-size: clamp(0.9rem, 2.5vw, 1.05rem);
    font-weight: var(--font-weight-bold);
    margin-bottom: clamp(6px, 1.8vw, 10px);
    color: var(--text-primary);
    letter-spacing: -0.01em;
}
.seo-content__body {
    font-size: clamp(0.74rem, 2vw, 0.84rem);
    color: var(--text-secondary);
    line-height: 1.7;
}
.seo-content__body p {
    margin-bottom: clamp(8px, 2vw, 10px);
}
.seo-content__body strong {
    color: var(--text-primary);
    font-weight: var(--font-weight-semibold);
}

/* ═══════════════════════════════════════════════════════════════════════════
   9. FOOTER
   ═══════════════════════════════════════════════════════════════════════════ */
.footer {
    text-align: center;
    padding: clamp(6px, 2vw, 10px) 4px 0;
    font-size: clamp(0.68rem, 1.8vw, 0.76rem);
    color: var(--text-muted);
}
.footer__brand {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: clamp(6px, 2vw, 10px);
    margin-bottom: 4px;
}
.footer__logo {
    font-weight: var(--font-weight-extrabold);
    font-size: clamp(0.95rem, 2.5vw, 1.05rem);
    color: #fff;
    letter-spacing: -0.02em;
}
.footer__tagline {
    font-size: clamp(0.64rem, 1.6vw, 0.7rem);
    background: rgba(255, 255, 255, 0.04);
    padding: 3px 11px;
    border-radius: var(--radius-full);
    backdrop-filter: blur(var(--blur-glass-light));
    -webkit-backdrop-filter: blur(var(--blur-glass-light));
    border: 1px solid var(--border-subtle);
}
.footer__credit {
    margin-bottom: 2px;
    color: var(--text-secondary);
}
.footer__credit strong {
    color: var(--text-primary);
}
.footer__disclaimer {
    font-size: clamp(0.63rem, 1.6vw, 0.68rem);
    opacity: 0.7;
    max-width: 400px;
    margin: clamp(4px, 1.5vw, 8px) auto 0;
}

/* ═══════════════════════════════════════════════════════════════════════════
   10. ACCESSIBILITY — SCREEN READER ONLY
   ═══════════════════════════════════════════════════════════════════════════ */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ═══════════════════════════════════════════════════════════════════════════
   11. RESPONSIVE BREAKPOINTS
   ═══════════════════════════════════════════════════════════════════════════ */

/* ── Extra Small Devices (≤360px) ── */
@media (max-width: 360px) {
    .main-container {
        padding: 10px 10px 20px;
        gap: 14px;
    }
    .calculator-card {
        padding: 14px 12px;
        border-radius: var(--radius-xl);
    }
    .result-card {
        padding: 16px 12px;
        border-radius: var(--radius-xl);
    }
    .form-actions {
        flex-direction: column;
        gap: 8px;
    }
    .btn {
        padding: 12px 14px;
        font-size: 0.82rem;
    }
    .bmi-score-display__value {
        font-size: 2.6rem;
    }
    .report-details {
        grid-template-columns: 1fr;
        gap: 8px;
    }
    .gender-toggle__btn {
        padding: 9px 6px;
        font-size: 0.74rem;
        gap: 3px;
    }
    .unit-toggle__btn {
        padding: 5px 8px;
        font-size: 0.66rem;
    }
    .unit-toggle__label {
        font-size: 0.64rem;
        margin: 0 3px;
    }
}

/* ── Small Devices (361px – 480px) ── */
@media (min-width: 361px) and (max-width: 480px) {
    .main-container {
        padding: 12px 12px 24px;
        gap: 16px;
    }
    .calculator-card {
        padding: 16px 14px;
    }
    .result-card {
        padding: 18px 14px;
    }
    .form-actions {
        gap: 8px;
    }
    .btn {
        padding: 11px 14px;
        font-size: 0.84rem;
    }
    .bmi-score-display__value {
        font-size: 3rem;
    }
    .report-details {
        grid-template-columns: 1fr 1fr;
        gap: 9px;
    }
    .gender-toggle__btn {
        padding: 10px 7px;
        font-size: 0.78rem;
    }
}

/* ── Tablet (481px – 768px) ── */
@media (min-width: 481px) and (max-width: 768px) {
    .main-container {
        padding: 16px 16px 30px;
        gap: 20px;
    }
    .calculator-card {
        padding: 20px 18px;
    }
    .result-card {
        padding: 22px 18px;
    }
    .bmi-score-display__value {
        font-size: 4rem;
    }
    .report-details {
        grid-template-columns: 1fr 1fr;
        gap: 11px;
    }
}

/* ── Tablet Landscape / Small Desktop (769px – 1024px) ── */
@media (min-width: 769px) and (max-width: 1024px) {
    .main-container {
        padding: 20px 20px 36px;
        gap: 24px;
    }
    .calculator-card {
        padding: 24px 22px;
    }
    .result-card {
        padding: 26px 22px;
    }
    .bmi-score-display__value {
        font-size: 4.6rem;
    }
}

/* ── Desktop (≥1025px) ── */
@media (min-width: 1025px) {
    body {
        padding: 30px 0;
        align-items: flex-start;
    }
    .main-container {
        max-width: 680px;
        padding: 32px 24px 52px;
        gap: 30px;
    }
    .bg-orb--1 {
        width: 560px;
        height: 560px;
        top: -140px;
        left: -100px;
    }
    .bg-orb--2 {
        width: 480px;
        height: 480px;
        bottom: -120px;
        right: -90px;
    }
    .bg-orb--3 {
        width: 340px;
        height: 340px;
    }
    .header__title {
        font-size: 2.1rem;
    }
    .calculator-card {
        padding: 32px 28px;
        border-radius: var(--radius-2xl);
    }
    .result-card {
        padding: 34px 28px;
        border-radius: var(--radius-2xl);
    }
    .bmi-score-display__value {
        font-size: 5.5rem;
    }
    .form-field__input {
        padding: 15px 18px;
        font-size: 1.02rem;
    }
    .btn {
        padding: 15px 22px;
        font-size: 0.98rem;
    }
    .report-details {
        grid-template-columns: 1fr 1fr;
        gap: 14px;
    }
    .report-detail-item {
        padding: 16px 15px;
    }
}

/* ── Large Desktop (≥1440px) ── */
@media (min-width: 1440px) {
    .main-container {
        max-width: 720px;
    }
    .header__title {
        font-size: 2.4rem;
    }
    .bmi-score-display__value {
        font-size: 6rem;
    }
    .bg-orb--1 {
        width: 650px;
        height: 650px;
    }
    .bg-orb--2 {
        width: 550px;
        height: 550px;
    }
}

/* ═══════════════════════════════════════════════════════════════════════════
   12. REDUCED MOTION PREFERENCE
   ═══════════════════════════════════════════════════════════════════════════ */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    .bg-orb {
        animation: none;
    }
    .bmi-scale__marker {
        transition: none;
    }
}

/* ═══════════════════════════════════════════════════════════════════════════
   13. PRINT STYLES
   ═══════════════════════════════════════════════════════════════════════════ */
@media print {
    body {
        background: #fff;
        color: #000;
    }
    .bg-orb, .bg-grid {
        display: none;
    }
    .calculator-card, .result-card {
        background: #fff;
        border: 1px solid #ccc;
        box-shadow: none;
        backdrop-filter: none;
    }
    .btn {
        display: none;
    }
}