/* ============================================
   ACR CALCULATOR — DESIGN SYSTEM
   acrcalculator.com
   ============================================ */

/* ---------- Google Fonts ---------- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

/* ---------- CSS Custom Properties ---------- */
:root {
  /* Primary Palette — Red-Orange + Stone */
  --color-primary: #E1512C;
  --color-primary-hover: #C43F1F;
  --color-primary-light: rgba(225, 81, 44, 0.10);
  --color-primary-subtle: rgba(225, 81, 44, 0.06);

  /* Accent */
  --color-accent-dark: #57534E;
  --color-deep-accent: #78350F;

  /* Backgrounds */
  --color-bg: #FAFAF9;
  --color-surface: #FFFFFF;
  --color-surface-elevated: #FFFFFF;

  /* Borders */
  --color-border: #E7E5E4;
  --color-border-light: #F5F5F4;

  /* Text */
  --color-text: #292524;
  --color-text-secondary: #78716C;
  --color-text-muted: #A8A29E;
  --color-text-inverse: #FFFFFF;

  /* Semantic */
  --color-success: #16A34A;
  --color-success-bg: rgba(22, 163, 74, 0.08);
  --color-warning: #D97706;
  --color-warning-bg: rgba(217, 119, 6, 0.08);
  --color-danger: #DC2626;
  --color-danger-bg: rgba(220, 38, 38, 0.08);
  --color-info: #2563EB;
  --color-info-bg: rgba(37, 99, 235, 0.08);

  /* Typography */
  --font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-size-xs: 0.75rem;     /* 12px */
  --font-size-sm: 0.875rem;    /* 14px */
  --font-size-base: 1rem;      /* 16px */
  --font-size-md: 1.125rem;    /* 18px */
  --font-size-lg: 1.25rem;     /* 20px */
  --font-size-xl: 1.5rem;      /* 24px */
  --font-size-2xl: 1.875rem;   /* 30px */
  --font-size-3xl: 2.25rem;    /* 36px */
  --font-size-4xl: 3rem;       /* 48px */
  --font-size-5xl: 3.75rem;    /* 60px */

  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;

  --line-height-tight: 1.2;
  --line-height-snug: 1.375;
  --line-height-normal: 1.6;
  --line-height-relaxed: 1.75;

  /* Spacing Scale */
  --space-1: 0.25rem;   /* 4px */
  --space-2: 0.5rem;    /* 8px */
  --space-3: 0.75rem;   /* 12px */
  --space-4: 1rem;      /* 16px */
  --space-5: 1.25rem;   /* 20px */
  --space-6: 1.5rem;    /* 24px */
  --space-8: 2rem;      /* 32px */
  --space-10: 2.5rem;   /* 40px */
  --space-12: 3rem;     /* 48px */
  --space-16: 4rem;     /* 64px */
  --space-20: 5rem;     /* 80px */
  --space-24: 6rem;     /* 96px */

  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.06), 0 2px 4px -2px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.07), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.15);
  --shadow-primary: 0 4px 14px rgba(225, 81, 44, 0.25);
  --shadow-primary-lg: 0 8px 24px rgba(225, 81, 44, 0.3);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;
  --transition-spring: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Layout */
  --container-max: 1200px;
  --container-narrow: 800px;
  --container-wide: 1400px;
  --nav-height: 72px;
}

/* ---------- Reset & Base ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-normal);
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-primary-hover);
}

ul, ol {
  list-style: none;
}

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
}

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  color: var(--color-text);
}

h1 { font-size: var(--font-size-4xl); margin-bottom: var(--space-6); }
h2 { font-size: var(--font-size-2xl); margin-top: var(--space-12); margin-bottom: var(--space-4); }
h3 { font-size: var(--font-size-xl); margin-top: var(--space-8); margin-bottom: var(--space-3); }
h4 { font-size: var(--font-size-lg); margin-top: var(--space-6); margin-bottom: var(--space-2); }

p {
  margin-bottom: var(--space-4);
  line-height: var(--line-height-relaxed);
}

.text-secondary { color: var(--color-text-secondary); }
.text-muted { color: var(--color-text-muted); }
.text-primary { color: var(--color-primary); }
.text-center { text-align: center; }
.text-sm { font-size: var(--font-size-sm); }
.text-lg { font-size: var(--font-size-lg); }

/* ---------- Layout ---------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-6);
  padding-right: var(--space-6);
}

.container--narrow {
  max-width: var(--container-narrow);
}

.container--wide {
  max-width: var(--container-wide);
}

.section {
  padding-top: var(--space-16);
  padding-bottom: var(--space-16);
}

.section--sm {
  padding-top: var(--space-10);
  padding-bottom: var(--space-10);
}

/* ---------- Navigation ---------- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
  height: var(--nav-height);
  transition: box-shadow var(--transition-base);
}

.nav.scrolled {
  box-shadow: var(--shadow-md);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--container-wide);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
  text-decoration: none;
}

.nav__logo:hover {
  color: var(--color-text);
}

.nav__logo-icon {
  width: 36px;
  height: 36px;
  background: var(--color-primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: var(--font-weight-extrabold);
  font-size: var(--font-size-sm);
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav__link {
  padding: var(--space-2) var(--space-4);
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  text-decoration: none;
}

.nav__link:hover {
  color: var(--color-text);
  background: var(--color-primary-subtle);
}

.nav__link--active {
  color: var(--color-primary);
  background: var(--color-primary-light);
}

.nav__cta {
  margin-left: var(--space-3);
}

/* Mobile Menu Toggle */
.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
  z-index: 1001;
}

.nav__toggle span {
  width: 24px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all var(--transition-base);
}

.nav__toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav__toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav__toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ---------- Hero Section ---------- */
.hero {
  position: relative;
  padding-top: calc(var(--nav-height) + var(--space-16));
  padding-bottom: var(--space-16);
  overflow: hidden;
  background: var(--color-bg);
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: 
    radial-gradient(ellipse 80% 50% at 20% 40%, rgba(225, 81, 44, 0.06) 0%, transparent 70%),
    radial-gradient(ellipse 60% 40% at 80% 20%, rgba(120, 53, 15, 0.04) 0%, transparent 70%),
    radial-gradient(ellipse 50% 60% at 50% 80%, rgba(225, 81, 44, 0.03) 0%, transparent 70%);
  animation: heroGradientShift 12s ease-in-out infinite alternate;
  pointer-events: none;
}

@keyframes heroGradientShift {
  0% {
    opacity: 0.7;
    transform: scale(1) translate(0, 0);
  }
  50% {
    opacity: 1;
    transform: scale(1.05) translate(-1%, 1%);
  }
  100% {
    opacity: 0.8;
    transform: scale(1) translate(1%, -1%);
  }
}

/* Animated floating shapes */
.hero__shapes {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  overflow: hidden;
  pointer-events: none;
}

.hero__shape {
  position: absolute;
  border-radius: 50%;
  opacity: 0.04;
  animation: floatShape 20s ease-in-out infinite;
}

.hero__shape--1 {
  width: 400px;
  height: 400px;
  background: var(--color-primary);
  top: -100px;
  right: -100px;
  animation-delay: 0s;
  animation-duration: 18s;
}

.hero__shape--2 {
  width: 250px;
  height: 250px;
  background: var(--color-deep-accent);
  bottom: 0;
  left: -50px;
  animation-delay: -5s;
  animation-duration: 22s;
}

.hero__shape--3 {
  width: 180px;
  height: 180px;
  background: var(--color-primary);
  top: 40%;
  right: 15%;
  animation-delay: -10s;
  animation-duration: 25s;
}

@keyframes floatShape {
  0%, 100% { transform: translate(0, 0) rotate(0deg); }
  25% { transform: translate(20px, -30px) rotate(5deg); }
  50% { transform: translate(-10px, 20px) rotate(-3deg); }
  75% { transform: translate(15px, 10px) rotate(4deg); }
}

.hero__content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-6);
  border: 1px solid rgba(225, 81, 44, 0.15);
}

.hero__badge-dot {
  width: 8px;
  height: 8px;
  background: var(--color-primary);
  border-radius: 50%;
  animation: pulseDot 2s ease-in-out infinite;
}

@keyframes pulseDot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.3); }
}

.hero__title {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-extrabold);
  line-height: var(--line-height-tight);
  margin-bottom: var(--space-5);
  letter-spacing: -0.02em;
}

.hero__title-highlight {
  color: var(--color-primary);
  position: relative;
}

.hero__subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto var(--space-8);
  line-height: var(--line-height-relaxed);
}

.hero__trust {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-6);
  margin-top: var(--space-6);
  flex-wrap: wrap;
}

.hero__trust-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.hero__trust-icon {
  width: 20px;
  height: 20px;
  color: var(--color-success);
  flex-shrink: 0;
}

/* ---------- Tool Page Hero (smaller) ---------- */
.hero--tool {
  padding-top: calc(var(--nav-height) + var(--space-10));
  padding-bottom: var(--space-10);
}

.hero--tool .hero__title {
  font-size: var(--font-size-3xl);
}

/* ---------- Calculator Card ---------- */
.calculator-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  box-shadow: var(--shadow-lg);
  max-width: 600px;
  margin: var(--space-8) auto 0;
  position: relative;
  z-index: 1;
  transition: box-shadow var(--transition-base);
}

.calculator-card:hover {
  box-shadow: var(--shadow-xl);
}

.calculator-card__header {
  margin-bottom: var(--space-6);
  text-align: center;
}

.calculator-card__title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-1);
  margin-top: 0;
}

.calculator-card__subtitle {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

/* ---------- Form Elements ---------- */
.form-group {
  margin-bottom: var(--space-5);
}

.form-label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.form-label__hint {
  font-weight: var(--font-weight-normal);
  color: var(--color-text-muted);
  margin-left: var(--space-1);
}

.form-input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  font-size: var(--font-size-base);
  color: var(--color-text);
  background: var(--color-bg);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  outline: none;
}

.form-input:hover {
  border-color: var(--color-text-muted);
}

.form-input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
  background: var(--color-surface);
}

.form-input::placeholder {
  color: var(--color-text-muted);
}

.form-select {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  font-size: var(--font-size-base);
  color: var(--color-text);
  background: var(--color-bg);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  outline: none;
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='%2378716C' viewBox='0 0 16 16'%3E%3Cpath d='M4.646 5.646a.5.5 0 0 1 .708 0L8 8.293l2.646-2.647a.5.5 0 0 1 .708.708l-3 3a.5.5 0 0 1-.708 0l-3-3a.5.5 0 0 1 0-.708z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 36px;
}

.form-select:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}

.form-radio-group {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.form-radio {
  display: none;
}

.form-radio-label {
  display: inline-flex;
  align-items: center;
  padding: var(--space-2) var(--space-4);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  background: var(--color-bg);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.form-radio-label:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.form-radio:checked + .form-radio-label {
  background: var(--color-primary-light);
  border-color: var(--color-primary);
  color: var(--color-primary);
  font-weight: var(--font-weight-semibold);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  line-height: 1.4;
}

.btn--primary {
  background: var(--color-primary);
  color: var(--color-text-inverse);
  box-shadow: var(--shadow-primary);
}

.btn--primary:hover {
  background: var(--color-primary-hover);
  box-shadow: var(--shadow-primary-lg);
  transform: translateY(-1px);
  color: var(--color-text-inverse);
}

.btn--primary:active {
  transform: translateY(0);
}

.btn--outline {
  background: transparent;
  color: var(--color-primary);
  border: 1.5px solid var(--color-primary);
}

.btn--outline:hover {
  background: var(--color-primary-light);
  color: var(--color-primary-hover);
}

.btn--ghost {
  background: transparent;
  color: var(--color-text-secondary);
}

.btn--ghost:hover {
  background: var(--color-primary-subtle);
  color: var(--color-text);
}

.btn--lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--font-size-md);
  border-radius: var(--radius-md);
}

.btn--full {
  width: 100%;
}

.btn--calculate {
  width: 100%;
  padding: var(--space-4);
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-bold);
  border-radius: var(--radius-md);
  position: relative;
  overflow: hidden;
}

.btn--calculate::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(45deg, transparent 30%, rgba(255,255,255,0.15) 50%, transparent 70%);
  transform: translateX(-100%);
  transition: transform 0.6s ease;
}

.btn--calculate:hover::after {
  transform: translateX(100%);
}

/* Pulse animation on calculate button */
@keyframes subtlePulse {
  0%, 100% { box-shadow: 0 4px 14px rgba(225, 81, 44, 0.25); }
  50% { box-shadow: 0 4px 20px rgba(225, 81, 44, 0.4); }
}

.btn--calculate {
  animation: subtlePulse 3s ease-in-out infinite;
}

.btn--calculate:hover {
  animation: none;
}

/* ---------- Result Display ---------- */
.result {
  margin-top: var(--space-6);
  padding: var(--space-6);
  background: var(--color-bg);
  border-radius: var(--radius-md);
  border: 1.5px solid var(--color-border);
  text-align: center;
  display: none;
  animation: fadeInUp 0.4s ease;
}

.result.active {
  display: block;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.result__label {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  font-weight: var(--font-weight-medium);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-2);
}

.result__value {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-extrabold);
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.result__unit {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-normal);
  color: var(--color-text-secondary);
}

.result__interpretation {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  margin-top: var(--space-3);
}

.result__interpretation--normal {
  background: var(--color-success-bg);
  color: var(--color-success);
  border: 1px solid rgba(22, 163, 74, 0.2);
}

.result__interpretation--warning {
  background: var(--color-warning-bg);
  color: var(--color-warning);
  border: 1px solid rgba(217, 119, 6, 0.2);
}

.result__interpretation--danger {
  background: var(--color-danger-bg);
  color: var(--color-danger);
  border: 1px solid rgba(220, 38, 38, 0.2);
}

.result__interpretation--info {
  background: var(--color-info-bg);
  color: var(--color-info);
  border: 1px solid rgba(37, 99, 235, 0.2);
}

.result__details {
  margin-top: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  text-align: left;
  line-height: var(--line-height-relaxed);
}

.result__details p {
  margin-bottom: var(--space-2);
}

/* ---------- Medically Reviewed Badge ---------- */
.reviewed-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1.25rem;
  background: #FFFFFF;
  border: 1.5px solid #E7E5E4;
  border-radius: 9999px;
  font-size: 0.88rem;
  color: #78716C;
  text-decoration: none;
  transition: all 0.2s ease;
  margin: 1rem auto;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.03);
  text-align: left;
}

.reviewed-badge:hover {
  border-color: #E1512C;
  color: #1C1917;
  box-shadow: 0 4px 12px rgba(225, 81, 44, 0.12);
  transform: translateY(-1px);
}

.reviewed-badge__icon {
  width: 20px;
  height: 20px;
  color: #10B981;
  flex-shrink: 0;
}

.reviewed-badge__text strong {
  color: #1C1917;
  font-weight: 700;
}

/* ---------- Content Sections ---------- */
.content {
  max-width: var(--container-narrow);
  margin: 0 auto;
  padding: var(--space-16) var(--space-6);
  text-align: left;
}

.content h2 {
  color: var(--color-text);
  padding-bottom: var(--space-3);
  border-bottom: 2px solid var(--color-primary-light);
}

.content h3 {
  color: var(--color-accent-dark);
}

.content p {
  color: var(--color-text);
  font-size: var(--font-size-base);
}

.content ul, .content ol {
  margin-bottom: var(--space-4);
  padding-left: var(--space-6);
}

.content ul {
  list-style: disc;
}

.content ol {
  list-style: decimal;
}

.content li {
  margin-bottom: var(--space-2);
  line-height: var(--line-height-relaxed);
}

.content blockquote {
  border-left: 4px solid var(--color-primary);
  padding: var(--space-4) var(--space-6);
  margin: var(--space-6) 0;
  background: var(--color-primary-subtle);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-style: italic;
  color: var(--color-text-secondary);
}

.content table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-6) 0;
  font-size: var(--font-size-sm);
}

.content table th,
.content table td {
  padding: var(--space-3) var(--space-4);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

.content table th {
  background: var(--color-bg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
}

.content table tr:hover {
  background: var(--color-primary-subtle);
}

/* Inline reference highlight */
.content .highlight-box {
  background: var(--color-primary-subtle);
  border: 1px solid rgba(225, 81, 44, 0.12);
  border-radius: var(--radius-md);
  padding: var(--space-5);
  margin: var(--space-6) 0;
}

.content .highlight-box h4 {
  color: var(--color-primary);
  margin-top: 0;
  margin-bottom: var(--space-2);
}

/* ---------- Medical Disclaimer Snippet ---------- */
.disclaimer-snippet {
  background: var(--color-warning-bg);
  border: 1px solid rgba(217, 119, 6, 0.15);
  border-radius: var(--radius-md);
  padding: var(--space-4) var(--space-5);
  margin: var(--space-8) 0;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
}

.disclaimer-snippet__icon {
  width: 20px;
  height: 20px;
  color: var(--color-warning);
  flex-shrink: 0;
  margin-top: 1px;
}

.disclaimer-snippet a {
  color: var(--color-primary);
  font-weight: var(--font-weight-medium);
}

/* ---------- FAQ Accordion ---------- */
.faq,
section.faq,
div.faq {
  max-width: 760px;
  margin: 3rem auto 0;
  padding: 0 1rem;
}

.faq__title,
.faq-list-title,
.faq h2,
.faq > h2,
.faq > h3 {
  text-align: center;
  font-size: 1.75rem;
  font-weight: 700;
  color: #1C1917;
  margin-bottom: 2rem;
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.faq__item,
.faq-item {
  background: #FFFFFF;
  border: 1px solid #E7E5E4;
  border-radius: 12px;
  margin-bottom: 1.25rem;
  overflow: hidden;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.03);
  transition: all 0.25s ease;
}

.faq__item:hover,
.faq-item:hover {
  border-color: #E1512C;
  box-shadow: 0 4px 14px rgba(225, 81, 44, 0.08);
}

.faq__item.active,
.faq-item.active {
  border-color: #E1512C;
  box-shadow: 0 4px 16px rgba(225, 81, 44, 0.12);
}

.faq__question,
.faq-question,
h3.faq__question,
button.faq__question,
div.faq__question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 1.75rem;
  background: #FAFAFA;
  border: none;
  cursor: pointer;
  font-size: 1.15rem;
  font-weight: 700;
  color: #1C1917;
  text-align: left;
  line-height: 1.4;
  gap: 1rem;
  margin: 0;
  box-sizing: border-box;
  transition: background 0.2s ease, color 0.2s ease;
}

.faq__question:hover,
.faq-question:hover {
  background: #FFF5F2;
  color: #E1512C;
}

.faq__item.active .faq__question,
.faq-item.active .faq__question,
.faq__item.active h3.faq__question,
.faq-item.active h3.faq__question {
  background: #FFF5F2;
  color: #E1512C;
  border-bottom: 1px solid #FEE2E2;
}

.faq__icon,
.faq-icon {
  width: 22px;
  height: 22px;
  flex-shrink: 0;
  transition: transform 0.3s ease, color 0.2s ease;
  color: #A8A29E;
}

.faq__question:hover .faq__icon,
.faq-question:hover .faq__icon {
  color: #E1512C;
}

.faq__item.active .faq__icon,
.faq-item.active .faq__icon {
  transform: rotate(180deg);
  color: #E1512C;
}

.faq__answer,
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s cubic-bezier(0.4, 0, 0.2, 1), padding 0.3s ease;
  background: #FFFFFF;
}

.faq__item.active .faq__answer,
.faq-item.active .faq__answer,
details[open] .faq__answer,
details.active .faq__answer {
  max-height: 1000px;
}

.faq__answer-inner,
.faq-answer-inner {
  padding: 1.25rem 1.75rem 1.5rem;
  font-size: 1rem;
  color: #44403C;
  line-height: 1.65;
}

.faq__answer-inner p,
.faq-answer-inner p {
  margin: 0 0 0.75rem 0;
}

.faq__answer-inner p:last-child,
.faq-answer-inner p:last-child {
  margin-bottom: 0;
}

/* ---------- Modern Blog Post Style Tool Cards ---------- */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}

.tool-blog-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  background: #FFFFFF;
  border: 1px solid #E7E5E4;
  border-radius: 20px;
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 4px 20px -4px rgba(0, 0, 0, 0.05);
}

.tool-blog-card:hover {
  border-color: #E1512C;
  transform: translateY(-6px);
  box-shadow: 0 16px 32px -8px rgba(225, 81, 44, 0.16);
}

.tool-blog-card__header {
  background: linear-gradient(135deg, #FFF5F2 0%, #FAF0EC 100%);
  padding: 1.5rem 1.5rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid #FEE2E2;
}

.tool-blog-card__icon {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  background: #FFFFFF;
  border: 1px solid #FCA5A5;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  box-shadow: 0 4px 10px rgba(225, 81, 44, 0.08);
  transition: transform 0.3s ease;
}

.tool-blog-card:hover .tool-blog-card__icon {
  transform: scale(1.1) rotate(-3deg);
}

.tool-blog-card__badge {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.35rem 0.85rem;
  border-radius: 50px;
  background: #FFFFFF;
  color: #E1512C;
  border: 1px solid rgba(225, 81, 44, 0.2);
}

.tool-blog-card__body {
  padding: 1.5rem;
  flex: 1;
}

.tool-blog-card__body h3 {
  font-size: 1.2rem;
  font-weight: 700;
  color: #1C1917;
  margin: 0 0 0.5rem 0;
  line-height: 1.35;
  transition: color 0.2s ease;
}

.tool-blog-card:hover .tool-blog-card__body h3 {
  color: #E1512C;
}

.tool-blog-card__body p {
  font-size: 0.9rem;
  color: #78716C;
  line-height: 1.55;
  margin: 0;
}

.tool-blog-card__footer {
  padding: 1rem 1.5rem 1.25rem;
  border-top: 1px solid #F5F5F4;
  background: #FAFAFA;
}

.tool-blog-card__action {
  font-size: 0.88rem;
  font-weight: 700;
  color: #E1512C;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  transition: gap 0.2s ease;
}

.tool-blog-card:hover .tool-blog-card__action {
  gap: 0.7rem;
}

.tool-blog-card__action svg {
  transition: transform 0.2s ease;
}

.tool-blog-card:hover .tool-blog-card__action svg {
  transform: translateX(4px);
}

/* Backward compatibility for .tool-card */
.tool-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  background: #FFFFFF;
  border: 1px solid #E7E5E4;
  border-radius: 20px;
  padding: 1.5rem;
  text-decoration: none;
  color: inherit;
  transition: all 0.3s ease;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.03);
}

.tool-card:hover {
  border-color: #E1512C;
  transform: translateY(-4px);
  box-shadow: 0 12px 28px -6px rgba(225, 81, 44, 0.14);
}

/* Category Section Headings */
.tools-category-title {
  font-size: 1.5rem;
  font-weight: 800;
  color: #1C1917;
  margin: 3.5rem 0 1.25rem 0;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  border-bottom: 2px solid #FFF5F2;
  padding-bottom: 0.75rem;
}

/* Tools Filter & Search Bar */
.tools-search-wrapper {
  max-width: 680px;
  margin: 0 auto 2.5rem;
}

.tools-search-input {
  width: 100%;
  padding: 1rem 1.25rem 1rem 3rem;
  font-size: 1.05rem;
  border: 2px solid #E7E5E4;
  border-radius: 12px;
  outline: none;
  background: #FFFFFF url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke="%2378716C" stroke-width="2"><path stroke-linecap="round" stroke-linejoin="round" d="M21 21l-5.197-5.197m0 0A7.5 7.5 0 105.196 5.196a7.5 7.5 0 0010.607 10.607z"/></svg>') no-repeat 1rem center / 20px;
  transition: all 0.2s ease;
}

.tools-search-input:focus {
  border-color: #E1512C;
  box-shadow: 0 0 0 4px rgba(225, 81, 44, 0.1);
}

.tools-filter-pills {
  display: flex;
  gap: 0.5rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 1rem;
}

.tool-filter-pill {
  padding: 0.5rem 1.25rem;
  border-radius: 50px;
  font-size: 0.9rem;
  font-weight: 600;
  background: #F5F5F4;
  color: #57534E;
  border: 1px solid #E7E5E4;
  cursor: pointer;
  transition: all 0.2s ease;
}

.tool-filter-pill:hover,
.tool-filter-pill.active {
  background: #E1512C;
  color: #FFFFFF;
  border-color: #E1512C;
}

.tool-card__name {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
  margin-bottom: var(--space-1);
}

.tool-card__desc {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  line-height: var(--line-height-normal);
}

/* ---------- Related Calculators ---------- */
.related {
  padding: var(--space-12) 0;
  border-top: 1px solid var(--color-border);
}

.related__title {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-6);
  margin-top: 0;
  text-align: center;
}

.related__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-4);
  max-width: var(--container-narrow);
  margin: 0 auto;
}

/* ---------- Footer ---------- */
.footer {
  background: var(--color-accent-dark);
  color: rgba(255, 255, 255, 0.8);
  padding: var(--space-16) 0 var(--space-8);
}

.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-10);
  margin-bottom: var(--space-12);
}

.footer__brand h3 {
  color: white;
  font-size: var(--font-size-lg);
  margin-top: 0;
  margin-bottom: var(--space-3);
}

.footer__brand p {
  font-size: var(--font-size-sm);
  line-height: var(--line-height-relaxed);
  color: rgba(255, 255, 255, 0.6);
}

.footer__heading {
  color: white;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-4);
  margin-top: 0;
}

.footer__links {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer__link {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.6);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer__link:hover {
  color: white;
}

.footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.footer__copyright {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.4);
}

.footer__disclaimer {
  font-size: var(--font-size-xs);
  color: rgba(255, 255, 255, 0.35);
  max-width: 500px;
}

/* ---------- Page Header (Legal/Support Pages) ---------- */
.page-header {
  padding-top: calc(var(--nav-height) + var(--space-12));
  padding-bottom: var(--space-10);
  background: var(--color-bg);
  text-align: center;
  border-bottom: 1px solid var(--color-border);
}

.page-header h1 {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--space-3);
}

.page-header p {
  color: var(--color-text-secondary);
  font-size: var(--font-size-md);
  max-width: 600px;
  margin: 0 auto;
}

.page-content {
  max-width: var(--container-narrow);
  margin: 0 auto;
  padding: var(--space-12) var(--space-6);
}

.page-content h2 {
  margin-top: var(--space-10);
  margin-bottom: var(--space-4);
  color: var(--color-text);
}

.page-content p, .page-content li {
  line-height: var(--line-height-relaxed);
}

.page-content ul, .page-content ol {
  padding-left: var(--space-6);
  margin-bottom: var(--space-4);
}

.page-content ul { list-style: disc; }
.page-content ol { list-style: decimal; }

.page-content li {
  margin-bottom: var(--space-2);
}

/* ---------- Reviewer Cards ---------- */
.reviewer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-6);
  margin-top: var(--space-8);
}

.reviewer-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  display: flex;
  gap: var(--space-5);
  align-items: flex-start;
  transition: box-shadow var(--transition-base);
}

.reviewer-card:hover {
  box-shadow: var(--shadow-md);
}

.reviewer-card__photo {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  object-fit: cover;
  background: var(--color-border);
  flex-shrink: 0;
}

.reviewer-card__info h3 {
  font-size: var(--font-size-base);
  margin-top: 0;
  margin-bottom: var(--space-1);
}

.reviewer-card__credentials {
  font-size: var(--font-size-sm);
  color: var(--color-primary);
  font-weight: var(--font-weight-medium);
  margin-bottom: var(--space-1);
}

.reviewer-card__hospital {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2);
}

.reviewer-card__bio {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
}

/* ---------- Contact Form ---------- */
.contact-form {
  max-width: 600px;
  margin: 0 auto;
}

.contact-form .form-group {
  margin-bottom: var(--space-5);
}

.contact-form textarea.form-input {
  min-height: 150px;
  resize: vertical;
}

/* ---------- References Section ---------- */
.references {
  margin-top: var(--space-8);
  padding: var(--space-6);
  background: var(--color-bg);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

.references h3 {
  margin-top: 0;
  font-size: var(--font-size-base);
  margin-bottom: var(--space-4);
}

.references ol {
  padding-left: var(--space-5);
  list-style: decimal;
}

.references li {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2);
  line-height: var(--line-height-relaxed);
}

/* ---------- Schema / Hidden ---------- */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .footer__grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  :root {
    --nav-height: 64px;
  }

  h1 { font-size: var(--font-size-2xl); }
  h2 { font-size: var(--font-size-xl); }
  h3 { font-size: var(--font-size-lg); }

  .hero {
    padding-top: calc(var(--nav-height) + var(--space-10));
    padding-bottom: var(--space-10);
  }

  .hero__title {
    font-size: var(--font-size-2xl);
  }

  .hero--tool .hero__title {
    font-size: var(--font-size-xl);
  }

  .hero__subtitle {
    font-size: var(--font-size-base);
  }

  .calculator-card {
    padding: var(--space-5);
    margin-top: var(--space-6);
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  /* Mobile nav */
  .nav__toggle {
    display: flex;
  }

  .nav__links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: var(--color-surface);
    flex-direction: column;
    align-items: stretch;
    padding: calc(var(--nav-height) + var(--space-4)) var(--space-6) var(--space-6);
    box-shadow: var(--shadow-2xl);
    transition: right var(--transition-base);
    gap: var(--space-1);
    overflow-y: auto;
  }

  .nav__links.open {
    right: 0;
  }

  .nav__link {
    padding: var(--space-3) var(--space-4);
    font-size: var(--font-size-base);
  }

  .nav__cta {
    margin-left: 0;
    margin-top: var(--space-3);
  }

  .tools-grid__container {
    grid-template-columns: 1fr;
  }

  .footer__grid {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }

  .footer__bottom {
    flex-direction: column;
    text-align: center;
  }

  .section {
    padding-top: var(--space-10);
    padding-bottom: var(--space-10);
  }

  .content,
  .faq {
    padding: var(--space-10) var(--space-4);
  }

  .content table {
    display: block;
    overflow-x: auto;
  }

  .reviewer-grid {
    grid-template-columns: 1fr;
  }

  .reviewer-card {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .hero__trust {
    flex-direction: column;
    gap: var(--space-3);
  }

  .related__grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .hero__title {
    font-size: var(--font-size-xl);
  }

  .calculator-card {
    padding: var(--space-4);
    border-radius: var(--radius-md);
  }

  .result__value {
    font-size: var(--font-size-2xl);
  }
}

/* ---------- Mobile Overlay ---------- */
.nav__overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.4);
  z-index: 999;
  opacity: 0;
  transition: opacity var(--transition-base);
}

.nav__overlay.active {
  display: block;
  opacity: 1;
}

/* ---------- Print Styles ---------- */
@media print {
  .nav, .footer, .nav__overlay, .hero__shapes {
    display: none;
  }

  .hero {
    padding-top: var(--space-6);
  }

  body {
    background: white;
    color: black;
  }
}

/* ============================================
   NEW CALCULATOR & REFERENCE RANGES DESIGN
   (MATCHED TO WEBSITE THEME: #E1512C)
   ============================================ */

.calc-wrapper-ref {
  max-width: 940px;
  margin: var(--space-8) auto 0;
  position: relative;
  z-index: 2;
}

.calculator-card--ref {
  background: #FFFFFF;
  border: 1px solid #E7E5E4;
  border-radius: 16px;
  padding: 2rem;
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.01);
  margin-bottom: 1.5rem;
  text-align: left;
}

.calc-card-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2rem;
}

.calc-card-icon {
  width: 52px;
  height: 52px;
  background: #FFF5F2;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #E1512C;
  flex-shrink: 0;
  box-shadow: inset 0 0 0 1px rgba(225, 81, 44, 0.2);
}

.calc-card-icon svg {
  width: 28px;
  height: 28px;
}

.calc-card-title-group h2 {
  font-size: 1.35rem;
  font-weight: 700;
  color: #292524;
  margin: 0 0 4px 0;
  padding: 0;
  border: none;
}

.calc-card-title-group p {
  font-size: 0.9rem;
  color: #78716C;
  margin: 0;
}

.calc-two-col {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 2rem;
  align-items: center;
}

.input-field-group {
  margin-bottom: 1.25rem;
}

.input-field-label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  color: #292524;
  margin-bottom: 0.5rem;
}

.input-box-wrap {
  display: flex;
  align-items: stretch;
  width: 100%;
  position: relative;
}

.input-box-ref {
  flex: 1;
  min-width: 0;
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: 1rem;
  color: #292524;
  background: #FAFAF9;
  border: 1.5px solid #E7E5E4;
  border-top-left-radius: 10px;
  border-bottom-left-radius: 10px;
  border-top-right-radius: 0;
  border-bottom-right-radius: 0;
  outline: none;
  transition: all 0.2s ease;
}

.input-box-ref::placeholder {
  color: #A8A29E;
  opacity: 0.85;
}

.input-box-ref:focus {
  border-color: #E1512C;
  background: #FFFFFF;
  box-shadow: 0 0 0 3px rgba(225, 81, 44, 0.12);
  z-index: 2;
}

.select-unit-inline {
  flex-shrink: 0;
  width: auto;
  min-width: 85px;
  padding: 0 0.75rem;
  font-size: 0.88rem;
  font-weight: 600;
  color: #44403C;
  background: #F5F5F4;
  border: 1.5px solid #E7E5E4;
  border-left: none;
  border-top-left-radius: 0;
  border-bottom-left-radius: 0;
  border-top-right-radius: 10px;
  border-bottom-right-radius: 10px;
  cursor: pointer;
  outline: none;
  transition: all 0.2s ease;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%2357534E' viewBox='0 0 16 16'%3E%3Cpath d='M7.247 11.14 2.451 5.658C1.885 5.013 2.345 4 3.204 4h9.592a1 1 0 0 1 .753 1.659l-4.796 5.48a1 1 0 0 1-1.506 0z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  padding-right: 28px;
}

.select-unit-inline:focus,
.select-unit-inline:hover {
  background-color: #EAE8E6;
  border-color: #D6D3D1;
}

.btn-calc-submit {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  color: #FFFFFF;
  background: #E1512C;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.2s ease;
  box-shadow: 0 4px 14px rgba(225, 81, 44, 0.25);
  margin-top: 1rem;
}

.btn-calc-submit:hover {
  background: #C43F1F;
  box-shadow: 0 6px 18px rgba(225, 81, 44, 0.35);
  transform: translateY(-1px);
}

/* ACR Result Box (Right Column) */
.acr-result-card {
  background: #FFFFFF;
  border: 1.5px solid #E7E5E4;
  border-radius: 12px;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 220px;
  box-sizing: border-box;
}

/* Prompt state when empty */
.acr-result-empty-prompt {
  text-align: center;
  padding: 1.5rem 1rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.acr-result-empty-icon {
  width: 48px;
  height: 48px;
  color: #D6D3D1;
  margin-bottom: 0.75rem;
}

.acr-result-empty-text {
  font-size: 0.9rem;
  color: #78716C;
  margin: 0;
  max-width: 220px;
  line-height: 1.4;
}

.acr-result-content {
  display: none;
}

.acr-result-content.active {
  display: block;
}

.acr-result-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}

.acr-result-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: #78716C;
}

.acr-result-check-icon {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: #ECFDF5;
  color: #10B981;
  display: flex;
  align-items: center;
  justify-content: center;
}

.acr-result-check-icon svg {
  width: 16px;
  height: 16px;
}

.acr-result-big-value {
  font-size: 2.25rem;
  font-weight: 800;
  color: #2563EB;
  margin-bottom: 0.75rem;
  line-height: 1.1;
  transition: color 0.2s ease;
}

.acr-result-big-value--normal {
  color: #10B981;
}

.acr-result-big-value--micro {
  color: #D97706;
}

.acr-result-big-value--macro {
  color: #DC2626;
}

.status-pill-wrap {
  margin-bottom: 0.75rem;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 14px;
  border-radius: 9999px;
  font-size: 0.85rem;
  font-weight: 600;
}

.status-pill--normal {
  background: #10B981;
  color: #FFFFFF;
}

.status-pill--micro {
  background: #D97706;
  color: #FFFFFF;
}

.status-pill--macro {
  background: #DC2626;
  color: #FFFFFF;
}

.acr-result-subtext {
  font-size: 0.875rem;
  color: #78716C;
  line-height: 1.5;
  margin: 0;
}

/* Action Button: Make reports */
.reports-action-wrap {
  text-align: center;
  margin: 1.5rem 0 2.5rem;
}

.btn-make-reports {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 2rem;
  font-size: 0.95rem;
  font-weight: 600;
  color: #FFFFFF;
  background: #E1512C;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.2s ease;
  box-shadow: 0 4px 14px rgba(225, 81, 44, 0.2);
  text-decoration: none;
}

.btn-make-reports:hover {
  background: #C43F1F;
  color: #FFFFFF;
  transform: translateY(-1px);
  box-shadow: 0 6px 18px rgba(225, 81, 44, 0.3);
}

/* Reference Ranges Card */
.reference-card-ref {
  background: #FFFFFF;
  border: 1px solid #E7E5E4;
  border-radius: 16px;
  padding: 2rem;
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05);
  text-align: left;
}

.ref-card-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.25rem;
  font-weight: 700;
  color: #292524;
  margin: 0 0 1.5rem 0;
  border: none;
  padding: 0;
}

.ref-card-title svg {
  width: 22px;
  height: 22px;
  color: #78716C;
}

.reference-grid-three {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.ref-item-card {
  background: #FFFFFF;
  border: 1px solid #E7E5E4;
  border-radius: 12px;
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.ref-item-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.ref-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: 9999px;
  font-size: 0.8rem;
  font-weight: 600;
  width: fit-content;
}

.ref-badge--normal {
  background: #10B981;
  color: #FFFFFF;
}

.ref-badge--micro {
  background: #FEF3C7;
  color: #92400E;
  border: 1px solid #FCD34D;
}

.ref-badge--macro {
  background: #DC2626;
  color: #FFFFFF;
}

.ref-value-range {
  font-size: 1.1rem;
  font-weight: 700;
  color: #292524;
}

.ref-description {
  font-size: 0.85rem;
  color: #78716C;
  margin: 0;
}

@media (max-width: 768px) {
  .calc-two-col {
    grid-template-columns: 1fr;
  }
  .reference-grid-three {
    grid-template-columns: 1fr;
  }
}

/* ---------- Sticky Tools Sidebar Layout ---------- */
.home-content-container {
  max-width: 1280px;
  margin: 4rem auto 0;
  padding: 0 1.5rem;
}

.home-content-grid {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 2.5rem;
  align-items: start;
}

.home-article-main {
  min-width: 0;
  text-align: left;
  margin: 0;
  padding: 0;
}

.home-article-main h2,
.home-article-main h3,
.home-article-main h4,
.home-article-main p,
.home-article-main ul,
.home-article-main ol,
.home-article-main blockquote {
  text-align: left;
}

.home-sticky-sidebar {
  position: sticky;
  top: 90px;
  align-self: start;
}

.sticky-tools-card {
  background: #FFFFFF;
  border: 1px solid #E7E5E4;
  border-radius: 16px;
  padding: 1.5rem;
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05);
}

.sticky-tools-header {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  margin-bottom: 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 2px solid #FFF5F2;
}

.sticky-tools-header svg {
  width: 22px;
  height: 22px;
  color: #E1512C;
}

.sticky-tools-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: #1C1917;
  margin: 0;
}

.sticky-tools-group {
  margin-bottom: 1.25rem;
}

.sticky-tools-group-title {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #78716C;
  margin-bottom: 0.6rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.sticky-tools-list {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  list-style: none;
  padding: 0;
  margin: 0;
}

.sticky-tool-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.55rem 0.75rem;
  border-radius: 8px;
  font-size: 0.88rem;
  font-weight: 500;
  color: #44403C;
  text-decoration: none;
  transition: all 0.15s ease;
  background: #FAFAFA;
}

.sticky-tool-link:hover {
  background: #FFF5F2;
  color: #E1512C;
  transform: translateX(2px);
}

.sticky-tool-link svg {
  width: 14px;
  height: 14px;
  color: #A8A29E;
  transition: transform 0.15s ease, color 0.15s ease;
}

.sticky-tool-link:hover svg {
  color: #E1512C;
  transform: translateX(2px);
}

/* ---------- Save Report Modal Styles ---------- */
.report-modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(15, 23, 42, 0.65);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 99999;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}

.report-modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.report-modal-card {
  background: #FFFFFF;
  border-radius: 24px;
  width: 100%;
  max-width: 580px;
  padding: 2rem;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  transform: translateY(20px) scale(0.96);
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  box-sizing: border-box;
}

.report-modal-overlay.active .report-modal-card {
  transform: translateY(0) scale(1);
}

.report-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid #F5F5F4;
  margin-bottom: 1.25rem;
}

.report-modal-title {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.report-modal-title svg {
  width: 26px;
  height: 26px;
  color: #E1512C;
}

.report-modal-title h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: #1C1917;
  margin: 0;
}

.report-modal-close {
  background: #F5F5F4;
  border: none;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  font-size: 1.5rem;
  color: #78716C;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
}

.report-modal-close:hover {
  background: #FEE2E2;
  color: #DC2626;
}

.report-modal-timestamp {
  font-size: 0.85rem;
  font-weight: 600;
  color: #E1512C;
  background: #FFF5F2;
  border: 1px solid #FEE2E2;
  padding: 0.4rem 0.9rem;
  border-radius: 50px;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin-bottom: 1rem;
}

.report-modal-preview {
  background: #FAFAFA;
  border: 1.5px solid #E7E5E4;
  border-radius: 16px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  text-align: left;
}

.report-preview-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: #1C1917;
  margin: 0 0 0.5rem 0;
}

.report-preview-value {
  font-size: 2rem;
  font-weight: 800;
  color: #E1512C;
  margin-bottom: 0.5rem;
}

.report-preview-status {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 700;
  background: #10B981;
  color: #FFFFFF;
  margin-bottom: 0.75rem;
}

.report-preview-desc {
  font-size: 0.9rem;
  color: #57534E;
  margin: 0;
  line-height: 1.5;
}

.report-modal-actions {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.report-action-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.65rem;
  width: 100%;
  padding: 0.85rem 1.5rem;
  border-radius: 12px;
  font-size: 0.98rem;
  font-weight: 700;
  cursor: pointer;
  border: none;
  transition: all 0.2s ease;
  text-decoration: none;
}

.report-action-btn svg {
  width: 20px;
  height: 20px;
}

.report-action-btn--primary {
  background: #E1512C;
  color: #FFFFFF;
  box-shadow: 0 4px 14px rgba(225, 81, 44, 0.25);
}

.report-action-btn--primary:hover {
  background: #C43F1F;
  transform: translateY(-1px);
  box-shadow: 0 6px 18px rgba(225, 81, 44, 0.35);
}

.report-action-btn--secondary {
  background: #1C1917;
  color: #FFFFFF;
}

.report-action-btn--secondary:hover {
  background: #292524;
  transform: translateY(-1px);
}

.report-action-btn--share {
  background: #2563EB;
  color: #FFFFFF;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.2);
}

.report-action-btn--share:hover {
  background: #1D4ED8;
  transform: translateY(-1px);
}

.report-toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: #1C1917;
  color: #FFFFFF;
  padding: 0.75rem 1.5rem;
  border-radius: 50px;
  font-size: 0.9rem;
  font-weight: 600;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
  z-index: 100000;
  opacity: 0;
  transition: all 0.3s ease;
}

.report-toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

/* ============================================================
   COMPLETE MOBILE & TABLET RESPONSIVENESS SYSTEM (ALL BREAKPOINTS)
   ============================================================ */

/* Prevent Horizontal Scrolling on Mobile Devices */
html, body {
  overflow-x: hidden !important;
  width: 100% !important;
  max-width: 100vw !important;
}

/* Global Box-Sizing & Image / Media Scaling */
*, *::before, *::after {
  box-sizing: border-box;
}

img, video, canvas, svg, iframe {
  max-width: 100% !important;
  height: auto;
}

/* Responsive Table Wrapper */
.home-article-main table,
.page-content table,
.content table,
.calculator-card table,
.reference-card-ref table {
  width: 100% !important;
  display: block !important;
  overflow-x: auto !important;
  -webkit-overflow-scrolling: touch !important;
}

/* ------------------------------------------------------------
   1. LARGE TABLETS & LAPTOPS (max-width: 1024px)
   ------------------------------------------------------------ */
@media (max-width: 1024px) {
  :root {
    --nav-height: 68px;
  }

  .home-content-grid {
    grid-template-columns: 1fr !important;
    gap: 2.5rem !important;
  }

  .home-sticky-sidebar {
    position: static !important;
    width: 100% !important;
    max-height: none !important;
    margin-top: 2rem !important;
  }

  .calc-two-col {
    grid-template-columns: 1fr !important;
    gap: 2rem !important;
  }

  .footer__grid {
    grid-template-columns: repeat(2, 1fr) !important;
    gap: 2.5rem 1.5rem !important;
  }
}

/* ------------------------------------------------------------
   2. SMARTPHONES & SMALL TABLETS (max-width: 768px)
   ------------------------------------------------------------ */
@media (max-width: 768px) {
  :root {
    --nav-height: 64px;
  }

  /* Containers & Spacing */
  .container,
  .home-content-container {
    padding-left: 1rem !important;
    padding-right: 1rem !important;
  }

  /* Hero Section & Generous Header Offset Spacing */
  .hero {
    padding-top: calc(var(--nav-height) + 3rem) !important;
    padding-bottom: 2rem !important;
    padding-left: 0 !important;
    padding-right: 0 !important;
  }

  .hero--tool {
    padding-top: calc(var(--nav-height) + 2.5rem) !important;
    padding-bottom: 1.5rem !important;
  }

  .page-header {
    padding-top: calc(var(--nav-height) + 2.5rem) !important;
    padding-bottom: 1.5rem !important;
  }

  .badge, .hero__badge {
    display: inline-block !important;
    max-width: 94% !important;
    font-size: 0.8rem !important;
    padding: 0.4rem 0.85rem !important;
    margin-bottom: 0.75rem !important;
    white-space: normal !important;
    line-height: 1.35 !important;
  }

  .hero h1 {
    font-size: clamp(1.55rem, 5.5vw, 2.1rem) !important;
    line-height: 1.25 !important;
    margin-top: 0.25rem !important;
    margin-bottom: 0.75rem !important;
  }

  .hero__subtitle {
    font-size: 0.95rem !important;
    line-height: 1.55 !important;
    padding: 0 0.5rem;
    margin-bottom: 1.5rem !important;
  }

  /* Trust Indicator Pills */
  .trust-indicators,
  .hero__trust {
    display: flex !important;
    flex-direction: column !important;
    align-items: center !important;
    justify-content: center !important;
    gap: 0.5rem !important;
    margin: 1rem auto 1.5rem !important;
    text-align: center !important;
  }

  .trust-indicator {
    width: 100% !important;
    max-width: 320px !important;
    justify-content: center !important;
    font-size: 0.82rem !important;
    padding: 0.45rem 1rem !important;
  }

  /* Navigation Header & Mobile Drawer */
  .nav__inner {
    padding: 0.5rem 1rem !important;
  }

  .nav__logo {
    font-size: 1.05rem !important;
  }

  .nav__logo-icon {
    width: 32px !important;
    height: 32px !important;
    font-size: 0.75rem !important;
  }

  .nav__links {
    position: fixed !important;
    top: var(--nav-height) !important;
    left: 0 !important;
    right: 0 !important;
    bottom: 0 !important;
    height: calc(100vh - var(--nav-height)) !important;
    background: #FFFFFF !important;
    flex-direction: column !important;
    padding: 1.5rem 1.25rem !important;
    gap: 0.75rem !important;
    align-items: stretch !important;
    box-shadow: 0 20px 40px rgba(0,0,0,0.15) !important;
    display: none !important;
    overflow-y: auto !important;
    z-index: 99999 !important;
  }

  .nav__links.open {
    display: flex !important;
  }

  .nav__link {
    font-size: 1.05rem !important;
    padding: 0.75rem 0.5rem !important;
    border-bottom: 1px solid #F5F5F4 !important;
  }

  .nav__cta {
    margin-top: 1rem !important;
    width: 100% !important;
    text-align: center !important;
    justify-content: center !important;
    padding: 0.85rem !important;
  }

  /* Calculator Card Header & Form Layout */
  .calculator-card,
  .calculator-card--ref,
  .acr-result-card,
  .reference-card-ref {
    padding: 1.25rem !important;
    border-radius: 16px !important;
  }

  .calc-card-header {
    flex-direction: column !important;
    align-items: center !important;
    text-align: center !important;
    gap: 0.75rem !important;
    margin-bottom: 1.5rem !important;
  }

  .calc-card-title-group h2 {
    font-size: 1.25rem !important;
    text-align: center !important;
    margin-bottom: 0.25rem !important;
  }

  .calc-card-title-group p {
    text-align: center !important;
    font-size: 0.85rem !important;
  }

  .input-box-wrap {
    display: flex !important;
    align-items: stretch !important;
    width: 100% !important;
    position: relative !important;
  }

  .input-box-ref {
    flex: 1 !important;
    min-width: 0 !important;
    width: 100% !important;
    padding: 0.75rem 0.85rem !important;
    font-size: 0.95rem !important;
  }

  .select-unit-inline {
    position: relative !important;
    top: auto !important;
    right: auto !important;
    bottom: auto !important;
    left: auto !important;
    flex-shrink: 0 !important;
    width: auto !important;
    min-width: 80px !important;
  }

  .btn-calc-submit,
  .btn-make-reports {
    width: 100% !important;
    padding: 0.95rem 1.25rem !important;
    font-size: 1rem !important;
  }

  /* Result Big Value Typography */
  .acr-result-big-value {
    font-size: clamp(2rem, 8vw, 3rem) !important;
  }

  /* Reference Ranges Grid */
  .reference-grid-three {
    grid-template-columns: 1fr !important;
    gap: 1rem !important;
  }

  /* Tools Directory Grid & Cards */
  .tools-grid {
    grid-template-columns: 1fr !important;
    gap: 1.25rem !important;
  }

  .tool-blog-card__header {
    padding: 1.25rem 1rem !important;
  }

  .tool-blog-card__body {
    padding: 1.25rem 1rem !important;
  }

  .tool-blog-card__footer {
    padding: 0.85rem 1rem !important;
  }

  /* Tools Search & Filter Pills */
  .tools-search-wrapper {
    margin-bottom: 1.5rem !important;
  }

  .tools-search-input {
    font-size: 0.95rem !important;
    padding: 0.85rem 1rem 0.85rem 2.5rem !important;
  }

  .tools-filter-pills {
    display: flex !important;
    overflow-x: auto !important;
    white-space: nowrap !important;
    padding: 0.4rem 0.2rem 0.6rem !important;
    -webkit-overflow-scrolling: touch !important;
    scrollbar-width: none !important;
    gap: 0.5rem !important;
  }

  .tools-filter-pills::-webkit-scrollbar {
    display: none !important;
  }

  .tool-filter-pill {
    flex-shrink: 0 !important;
    font-size: 0.82rem !important;
    padding: 0.4rem 0.85rem !important;
  }

  /* Reviewer Cards */
  .reviewer-grid,
  .reviewers-grid {
    grid-template-columns: 1fr !important;
    gap: 1.5rem !important;
  }

  .reviewer-img-wrap {
    height: 230px !important;
  }

  .reviewer-body {
    padding: 1.25rem !important;
  }

  .reviewer-name {
    font-size: 1.15rem !important;
  }
}

/* ------------------------------------------------------------
   3. EXTRA SMALL MOBILE PHONES (max-width: 480px)
   ------------------------------------------------------------ */
@media (max-width: 480px) {
  .hero {
    padding-top: calc(var(--nav-height) + 3.25rem) !important;
  }

  /* Footer 1-Column */
  .footer__grid {
    grid-template-columns: 1fr !important;
    gap: 2rem !important;
  }

  .footer__bottom {
    flex-direction: column !important;
    gap: 0.75rem !important;
    text-align: center !important;
  }

  /* Modal Lightbox Responsive Adjustments */
  #png-report-modal > div,
  .report-modal-card {
    width: 94% !important;
    padding: 1.25rem !important;
    border-radius: 18px !important;
    max-height: 92vh !important;
    overflow-y: auto !important;
  }

  #png-report-modal a,
  #png-report-modal button,
  .report-modal-actions button {
    width: 100% !important;
    justify-content: center !important;
  }
}