/* ============================================
   FitNirvana — Design System & Styles
   ============================================ */

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

/* --- CSS Custom Properties (Dark Theme Default) --- */
:root {
  /* Brand Colors */
  --primary: #00E676;
  --primary-dark: #00C853;
  --primary-glow: rgba(0, 230, 118, 0.3);
  --primary-subtle: rgba(0, 230, 118, 0.1);

  /* Dark Theme */
  --bg-primary: #0A0F14;
  --bg-secondary: #111820;
  --bg-tertiary: #1A2332;
  --bg-card: rgba(255, 255, 255, 0.04);
  --bg-card-hover: rgba(255, 255, 255, 0.08);
  --bg-input: rgba(255, 255, 255, 0.06);
  --bg-input-focus: rgba(255, 255, 255, 0.1);

  --text-primary: #FFFFFF;
  --text-secondary: #A0AEC0;
  --text-tertiary: #718096;
  --text-muted: #4A5568;

  --border-color: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(255, 255, 255, 0.15);

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 30px rgba(0, 230, 118, 0.15);

  --glass-bg: rgba(255, 255, 255, 0.05);
  --glass-border: rgba(255, 255, 255, 0.1);
  --glass-blur: blur(12px);

  /* Sizing */
  --nav-height: 72px;
  --container-max: 1200px;
  --container-narrow: 800px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;
}

/* --- Light Theme --- */
[data-theme="light"] {
  --bg-primary: #F7F8FC;
  --bg-secondary: #FFFFFF;
  --bg-tertiary: #EDF2F7;
  --bg-card: rgba(255, 255, 255, 0.8);
  --bg-card-hover: rgba(255, 255, 255, 0.95);
  --bg-input: rgba(0, 0, 0, 0.04);
  --bg-input-focus: rgba(0, 0, 0, 0.07);

  --text-primary: #1A202C;
  --text-secondary: #4A5568;
  --text-tertiary: #718096;
  --text-muted: #A0AEC0;

  --border-color: rgba(0, 0, 0, 0.08);
  --border-hover: rgba(0, 0, 0, 0.15);

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
  --shadow-glow: 0 0 30px rgba(0, 230, 118, 0.1);

  --glass-bg: rgba(255, 255, 255, 0.7);
  --glass-border: rgba(0, 0, 0, 0.06);
  --glass-blur: blur(12px);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
  transition: background-color var(--transition-base), color var(--transition-base);
}

h1, h2, h3, h4, h5, h6 {
  font-family: 'Poppins', sans-serif;
  font-weight: 700;
  line-height: 1.3;
  color: var(--text-primary);
}

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

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

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

/* --- Utility Classes --- */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

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

.section {
  padding: 80px 0;
}

.section--alt {
  background-color: var(--bg-secondary);
}

.text-center { text-align: center; }
.text-gradient {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* --- Scroll Reveal --- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

/* --- Navbar --- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: 1000;
  background: rgba(10, 15, 20, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  transition: background var(--transition-base), box-shadow var(--transition-base);
}

[data-theme="light"] .navbar {
  background: rgba(255, 255, 255, 0.85);
}

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

.navbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

.navbar__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: 'Poppins', sans-serif;
  font-weight: 800;
  font-size: 1.5rem;
  color: var(--text-primary);
  text-decoration: none;
}

.navbar__logo svg {
  width: 36px;
  height: 36px;
}

.navbar__logo span {
  background: linear-gradient(135deg, var(--primary), #4CAF50);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.navbar__links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.navbar__links a {
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
  transition: color var(--transition-fast);
  position: relative;
}

.navbar__links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: width var(--transition-base);
}

.navbar__links a:hover,
.navbar__links a.active {
  color: var(--primary);
}

.navbar__links a:hover::after,
.navbar__links a.active::after {
  width: 100%;
}

.navbar__actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.theme-toggle {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  color: var(--text-secondary);
}

.theme-toggle:hover {
  background: var(--bg-card-hover);
  color: var(--primary);
  border-color: var(--primary);
}

.theme-toggle svg {
  width: 20px;
  height: 20px;
}

.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: block; }
[data-theme="light"] .theme-toggle .icon-sun { display: block; }
[data-theme="light"] .theme-toggle .icon-moon { display: none; }

/* Hamburger */
.navbar__hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 28px;
  height: 28px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 0;
}

.navbar__hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--transition-fast);
}

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

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

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

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  font-family: 'Inter', sans-serif;
  font-size: 0.95rem;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
}

.btn--primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #0A0F14;
  box-shadow: 0 4px 15px rgba(0, 230, 118, 0.3);
}

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 25px rgba(0, 230, 118, 0.45);
  color: #0A0F14;
}

.btn--outline {
  background: transparent;
  color: var(--text-primary);
  border: 2px solid var(--border-color);
}

.btn--outline:hover {
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-2px);
}

.btn--sm {
  padding: 10px 20px;
  font-size: 0.875rem;
}

.btn--lg {
  padding: 16px 36px;
  font-size: 1.05rem;
}

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

/* --- Hero Section --- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--nav-height);
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero__bg::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 800px;
  height: 800px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0, 230, 118, 0.12) 0%, transparent 70%);
  animation: heroGlow 8s ease-in-out infinite alternate;
}

.hero__bg::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0, 200, 83, 0.08) 0%, transparent 70%);
  animation: heroGlow 10s ease-in-out infinite alternate-reverse;
}

@keyframes heroGlow {
  0% { transform: scale(1) translate(0, 0); }
  100% { transform: scale(1.15) translate(30px, -20px); }
}

.hero__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero__content {
  max-width: 600px;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: var(--primary-subtle);
  border: 1px solid rgba(0, 230, 118, 0.2);
  border-radius: 100px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 24px;
}

.hero__badge svg {
  width: 16px;
  height: 16px;
}

.hero__title {
  font-size: clamp(2.5rem, 5vw, 3.75rem);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 20px;
}

.hero__subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  margin-bottom: 36px;
  max-width: 520px;
}

.hero__buttons {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.hero__stats {
  display: flex;
  gap: 40px;
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid var(--border-color);
}

.hero__stat-value {
  font-family: 'Poppins', sans-serif;
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--primary);
}

.hero__stat-label {
  font-size: 0.85rem;
  color: var(--text-tertiary);
  margin-top: 4px;
}

/* Hero Illustration */
.hero__illustration {
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero__dashboard {
  width: 100%;
  max-width: 520px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  padding: 32px;
  box-shadow: var(--shadow-lg);
  animation: float 6s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

.dashboard__header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 24px;
}

.dashboard__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.dashboard__dot--red { background: #FF5F57; }
.dashboard__dot--yellow { background: #FFBD2E; }
.dashboard__dot--green { background: #28CA41; }

.dashboard__row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 16px;
}

.dashboard__card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 16px;
}

.dashboard__card-label {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 6px;
}

.dashboard__card-value {
  font-family: 'Poppins', sans-serif;
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--primary);
}

.dashboard__card-value--white {
  color: var(--text-primary);
}

.dashboard__bar-group {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.dashboard__bar {
  height: 8px;
  border-radius: 4px;
  background: var(--bg-input);
  overflow: hidden;
}

.dashboard__bar-fill {
  height: 100%;
  border-radius: 4px;
  background: linear-gradient(90deg, var(--primary), var(--primary-dark));
  transition: width 1s ease;
}

/* --- Tools Grid --- */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.tool-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  padding: 32px;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.tool-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--primary-dark));
  opacity: 0;
  transition: opacity var(--transition-base);
}

.tool-card:hover {
  transform: translateY(-4px);
  background: var(--bg-card-hover);
  box-shadow: var(--shadow-glow);
  border-color: rgba(0, 230, 118, 0.2);
}

.tool-card:hover::before {
  opacity: 1;
}

.tool-card__icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background: var(--primary-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  transition: all var(--transition-base);
}

.tool-card:hover .tool-card__icon {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
}

.tool-card__icon svg {
  width: 28px;
  height: 28px;
  color: var(--primary);
  transition: color var(--transition-base);
}

.tool-card:hover .tool-card__icon svg {
  color: #0A0F14;
}

.tool-card__title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.tool-card__desc {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 20px;
  line-height: 1.6;
}

.tool-card__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--primary);
}

.tool-card__link svg {
  width: 16px;
  height: 16px;
  transition: transform var(--transition-fast);
}

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

/* --- Section Headers --- */
.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-header__label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: 16px;
}

.section-header__title {
  font-size: clamp(2rem, 4vw, 2.75rem);
  margin-bottom: 16px;
}

.section-header__subtitle {
  color: var(--text-secondary);
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto;
}

/* --- Features Section --- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.feature-card {
  text-align: center;
  padding: 40px 24px;
  border-radius: var(--radius-lg);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  backdrop-filter: var(--glass-blur);
  transition: all var(--transition-base);
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.feature-card__icon {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--primary-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
}

.feature-card__icon svg {
  width: 28px;
  height: 28px;
  color: var(--primary);
}

.feature-card__title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.feature-card__desc {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* --- Calculator Page Styles --- */
.page-hero {
  padding: calc(var(--nav-height) + 40px) 0 40px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-tertiary);
  margin-bottom: 20px;
  list-style: none;
  flex-wrap: wrap;
}

.breadcrumb a {
  color: var(--text-tertiary);
}

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

.breadcrumb__separator {
  color: var(--text-muted);
}

.page-hero__title {
  font-size: clamp(2rem, 4vw, 2.75rem);
  margin-bottom: 12px;
}

.page-hero__desc {
  color: var(--text-secondary);
  font-size: 1.1rem;
  max-width: 700px;
}

/* Calculator Layout */
.calculator-section {
  padding: 60px 0;
}

.calculator-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}

.calculator-form {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  padding: 36px;
  box-shadow: var(--shadow-md);
}

.calculator-form__title {
  font-size: 1.3rem;
  margin-bottom: 28px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.calculator-form__title svg {
  width: 24px;
  height: 24px;
  color: var(--primary);
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.form-group input,
.form-group select {
  width: 100%;
  padding: 12px 16px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: 'Inter', sans-serif;
  font-size: 0.95rem;
  transition: all var(--transition-fast);
  outline: none;
}

.form-group input:focus,
.form-group select:focus {
  background: var(--bg-input-focus);
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(0, 230, 118, 0.15);
}

.form-group select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23718096' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 40px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.form-group select option {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

/* Gender Toggle */
.gender-toggle {
  display: flex;
  gap: 12px;
}

.gender-toggle__btn {
  flex: 1;
  padding: 12px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg-input);
  color: var(--text-secondary);
  font-family: 'Inter', sans-serif;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.gender-toggle__btn.active {
  background: var(--primary-subtle);
  border-color: var(--primary);
  color: var(--primary);
}

.gender-toggle__btn:hover:not(.active) {
  border-color: var(--border-hover);
}

/* Results Card */
.results-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  padding: 36px;
  box-shadow: var(--shadow-md);
  position: sticky;
  top: calc(var(--nav-height) + 20px);
}

.results-card__title {
  font-size: 1.3rem;
  margin-bottom: 28px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.results-card__title svg {
  width: 24px;
  height: 24px;
  color: var(--primary);
}

.results-card--empty {
  text-align: center;
  padding: 60px 36px;
}

.results-card__placeholder-icon {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: var(--primary-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
}

.results-card__placeholder-icon svg {
  width: 36px;
  height: 36px;
  color: var(--primary);
}

.results-card__placeholder-text {
  color: var(--text-tertiary);
  font-size: 0.95rem;
}

/* Result Items */
.result-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 0;
  border-bottom: 1px solid var(--border-color);
}

.result-item:last-child {
  border-bottom: none;
}

.result-item__label {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.result-item__value {
  font-family: 'Poppins', sans-serif;
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--primary);
}

.result-highlight {
  background: linear-gradient(135deg, rgba(0, 230, 118, 0.1), rgba(0, 200, 83, 0.05));
  border: 1px solid rgba(0, 230, 118, 0.2);
  border-radius: var(--radius-md);
  padding: 24px;
  text-align: center;
  margin-bottom: 24px;
}

.result-highlight__value {
  font-family: 'Poppins', sans-serif;
  font-size: 3rem;
  font-weight: 800;
  color: var(--primary);
  line-height: 1;
}

.result-highlight__label {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-top: 8px;
}

.result-highlight__category {
  display: inline-block;
  margin-top: 12px;
  padding: 4px 16px;
  border-radius: 100px;
  font-size: 0.8rem;
  font-weight: 600;
}

.category--essential { background: rgba(33, 150, 243, 0.15); color: #2196F3; }
.category--athlete { background: rgba(0, 230, 118, 0.15); color: #00E676; }
.category--fitness { background: rgba(76, 175, 80, 0.15); color: #4CAF50; }
.category--average { background: rgba(255, 193, 7, 0.15); color: #FFC107; }
.category--obese { background: rgba(244, 67, 54, 0.15); color: #F44336; }
.category--underweight { background: rgba(33, 150, 243, 0.15); color: #2196F3; }
.category--normal { background: rgba(0, 230, 118, 0.15); color: #00E676; }
.category--overweight { background: rgba(255, 193, 7, 0.15); color: #FFC107; }

/* Macro Chart */
.macro-chart-container {
  display: flex;
  justify-content: center;
  margin: 24px 0;
}

.macro-chart-container canvas {
  max-width: 220px;
  max-height: 220px;
}

.macro-legend {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin-top: 16px;
}

.macro-legend__item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.macro-legend__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

/* --- Content Sections --- */
.content-section {
  padding: 60px 0;
}

.content-section:nth-child(even) {
  background: var(--bg-secondary);
}

.content-section h2 {
  font-size: 1.75rem;
  margin-bottom: 20px;
}

.content-section h3 {
  font-size: 1.3rem;
  margin: 28px 0 12px;
}

.content-section p {
  color: var(--text-secondary);
  font-size: 1rem;
  margin-bottom: 16px;
  line-height: 1.8;
}

.content-section ul,
.content-section ol {
  color: var(--text-secondary);
  margin: 12px 0 16px 24px;
}

.content-section li {
  margin-bottom: 8px;
  line-height: 1.7;
}

/* Data Table */
.data-table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
  font-size: 0.95rem;
}

.data-table th {
  background: var(--primary-subtle);
  color: var(--primary);
  font-weight: 600;
  padding: 12px 16px;
  text-align: left;
  border-bottom: 2px solid var(--primary);
}

.data-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-secondary);
}

.data-table tr:hover td {
  background: var(--bg-card);
}

/* --- FAQ Section --- */
.faq-section {
  padding: 60px 0;
}

.faq-item {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  overflow: hidden;
  transition: all var(--transition-fast);
}

.faq-item:hover {
  border-color: var(--border-hover);
}

.faq-item.active {
  border-color: rgba(0, 230, 118, 0.3);
}

.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 24px;
  cursor: pointer;
  background: var(--bg-card);
  font-weight: 600;
  font-size: 1rem;
  color: var(--text-primary);
  border: none;
  width: 100%;
  text-align: left;
  font-family: 'Inter', sans-serif;
  transition: all var(--transition-fast);
}

.faq-question:hover {
  background: var(--bg-card-hover);
}

.faq-question svg {
  width: 20px;
  height: 20px;
  color: var(--text-tertiary);
  transition: transform var(--transition-base);
  flex-shrink: 0;
  margin-left: 16px;
}

.faq-item.active .faq-question svg {
  transform: rotate(180deg);
  color: var(--primary);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-base);
}

.faq-answer__inner {
  padding: 0 24px 18px;
  color: var(--text-secondary);
  line-height: 1.7;
  font-size: 0.95rem;
}

/* --- Internal Links Section --- */
.internal-links {
  padding: 60px 0;
  background: var(--bg-secondary);
}

.internal-links__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.internal-link-card {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: all var(--transition-base);
}

.internal-link-card:hover {
  transform: translateY(-2px);
  border-color: rgba(0, 230, 118, 0.3);
  box-shadow: var(--shadow-sm);
}

.internal-link-card__icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: var(--primary-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.internal-link-card__icon svg {
  width: 22px;
  height: 22px;
  color: var(--primary);
}

.internal-link-card__title {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-primary);
}

.internal-link-card__desc {
  font-size: 0.8rem;
  color: var(--text-tertiary);
  margin-top: 2px;
}

/* --- Ad Placeholders --- */
.ad-container {
  padding: 20px 0;
}

.ad-placeholder {
  background: var(--bg-card);
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
  min-height: 100px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.ad-placeholder--sidebar {
  min-height: 250px;
}

.ad-placeholder--footer {
  min-height: 90px;
}

/* --- Footer --- */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 60px 0 30px;
}

.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer__brand-desc {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-top: 16px;
  max-width: 300px;
}

.footer__heading {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--text-primary);
}

.footer__links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer__links a {
  color: var(--text-secondary);
  font-size: 0.9rem;
  transition: color var(--transition-fast);
}

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

.footer__bottom {
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text-tertiary);
  font-size: 0.85rem;
}

.footer__socials {
  display: flex;
  gap: 16px;
}

.footer__social-link {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.footer__social-link:hover {
  background: var(--primary);
  border-color: var(--primary);
  color: #0A0F14;
}

.footer__social-link svg {
  width: 16px;
  height: 16px;
}

/* --- Page With Sidebar Layout --- */
.page-content-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 40px;
  align-items: start;
}

.sidebar {
  position: sticky;
  top: calc(var(--nav-height) + 20px);
}

.sidebar__toc {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 24px;
}

.sidebar__toc-title {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.sidebar__toc-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.sidebar__toc-links a {
  color: var(--text-secondary);
  font-size: 0.85rem;
  transition: color var(--transition-fast);
  display: flex;
  align-items: center;
  gap: 8px;
}

.sidebar__toc-links a::before {
  content: '';
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--text-muted);
  transition: background var(--transition-fast);
}

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

.sidebar__toc-links a:hover::before {
  background: var(--primary);
}

/* Formula Box */
.formula-box {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  margin: 24px 0;
  font-family: 'Inter', monospace;
}

.formula-box__title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 12px;
}

.formula-box__content {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.8;
  word-break: break-all;
}

/* Benefits Grid */
.benefits-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin: 24px 0;
}

.benefit-item {
  display: flex;
  gap: 14px;
  padding: 20px;
  background: var(--bg-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

.benefit-item__icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: var(--primary-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.benefit-item__icon svg {
  width: 18px;
  height: 18px;
  color: var(--primary);
}

.benefit-item__title {
  font-weight: 600;
  font-size: 0.95rem;
  margin-bottom: 4px;
}

.benefit-item__desc {
  font-size: 0.85rem;
  color: var(--text-tertiary);
}

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

  .hero__content {
    max-width: 100%;
  }

  .hero__subtitle {
    max-width: 100%;
  }

  .hero__buttons {
    justify-content: center;
  }

  .hero__stats {
    justify-content: center;
  }

  .hero__illustration {
    display: none;
  }

  .tools-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .calculator-layout {
    grid-template-columns: 1fr;
  }

  .results-card {
    position: static;
  }

  .page-content-layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
    order: -1;
  }

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

  .internal-links__grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

@media (max-width: 768px) {
  .section {
    padding: 60px 0;
  }

  .navbar__links {
    display: none;
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-primary);
    flex-direction: column;
    justify-content: flex-start;
    padding: 40px 24px;
    gap: 24px;
    z-index: 999;
  }

  .navbar__links.active {
    display: flex;
  }

  .navbar__links a {
    font-size: 1.2rem;
  }

  .navbar__hamburger {
    display: flex;
  }

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

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

  .hero__stats {
    flex-direction: column;
    gap: 16px;
    align-items: center;
  }

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

  .footer__grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer__bottom {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }

  .internal-links__grid {
    grid-template-columns: 1fr;
  }

  .data-table {
    font-size: 0.85rem;
  }

  .data-table th,
  .data-table td {
    padding: 8px 10px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .hero__title {
    font-size: 2rem;
  }

  .hero__buttons {
    flex-direction: column;
    width: 100%;
  }

  .hero__buttons .btn {
    width: 100%;
  }

  .calculator-form,
  .results-card {
    padding: 24px;
  }

  .gender-toggle {
    flex-direction: column;
  }
}

/* --- Print Styles --- */
@media print {
  .navbar,
  .footer,
  .ad-container,
  .theme-toggle,
  .hero__bg {
    display: none !important;
  }

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