/* PMarium - Comprehensive Guide to Understanding Body Weight and Sustainable Dietary Practices */

/* ===== ROOT & TYPOGRAPHY ===== */
@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@400;500;600;700&family=Lora:wght@400;500;600&display=swap');

:root {
  --color-primary: #2C3E50;
  --color-secondary: #BDC3C7;
  --color-accent-warm: #F39C12;
  --color-accent-green: #27AE60;
  --color-white: #FFFFFF;
  --color-text-dark: #1A1A1A;
  --color-text-light: #555555;
  --color-bg-light: #F8F8F8;
  
  --font-heading: 'Montserrat', sans-serif;
  --font-body: 'Lora', serif;
  
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 32px;
  --spacing-xl: 60px;
  --spacing-xxl: 80px;
  
  --radius: 4px;
  --transition: all 0.3s ease;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text-dark);
  background-color: var(--color-white);
  overflow-x: hidden;
}

/* ===== TYPOGRAPHY ===== */
h1 {
  font-family: var(--font-heading);
  font-size: 3.5rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-lg);
  color: var(--color-primary);
  text-balance: true;
}

h2 {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: var(--spacing-lg);
  color: var(--color-primary);
  text-balance: true;
}

h3 {
  font-family: var(--font-heading);
  font-size: 1.75rem;
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: var(--spacing-md);
  color: var(--color-primary);
}

h4 {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--spacing-md);
  color: var(--color-primary);
}

p {
  font-size: 1rem;
  line-height: 1.65;
  margin-bottom: var(--spacing-md);
  color: var(--color-text-light);
}

a {
  color: var(--color-accent-warm);
  text-decoration: none;
  transition: var(--transition);
}

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

/* ===== LAYOUT ===== */
.container {
  width: 100%;
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
}

section {
  padding: var(--spacing-xxl) 0;
  border-bottom: 1px solid var(--color-secondary);
}

section:last-child {
  border-bottom: none;
}

/* ===== HEADER & NAVIGATION ===== */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-secondary);
  z-index: 1000;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.header-wrapper {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-lg) var(--spacing-xl);
  max-width: 1440px;
  margin: 0 auto;
}

.logo {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
}

nav ul {
  display: flex;
  list-style: none;
  gap: var(--spacing-lg);
}

nav a {
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text-dark);
  transition: var(--transition);
  padding-bottom: 4px;
  border-bottom: 2px solid transparent;
}

nav a:hover {
  color: var(--color-accent-warm);
  border-bottom-color: var(--color-accent-warm);
  text-decoration: none;
}

nav a.active {
  color: var(--color-accent-warm);
  border-bottom-color: var(--color-accent-warm);
}

/* ===== MAIN CONTENT ===== */
main {
  margin-top: 80px;
}

/* ===== HERO SECTION ===== */
.hero {
  padding: var(--spacing-xxl) var(--spacing-xl);
  background-color: var(--color-primary);
  color: var(--color-white);
  text-align: center;
}

.hero h1 {
  color: var(--color-white);
  font-size: 3rem;
  margin-bottom: var(--spacing-lg);
}

.hero p {
  color: var(--color-secondary);
  font-size: 1.1rem;
  max-width: 800px;
  margin: 0 auto var(--spacing-lg);
}

/* ===== TWO COLUMN LAYOUT ===== */
.two-column {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
  align-items: center;
}

.two-column-reverse {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
  align-items: center;
}

.two-column-reverse > :first-child {
  order: 2;
}

.two-column-reverse > :last-child {
  order: 1;
}

/* ===== THREE COLUMN GRID ===== */
.grid-three {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
}

/* ===== CARDS ===== */
.card {
  background-color: var(--color-white);
  border: 1px solid var(--color-secondary);
  padding: var(--spacing-lg);
  border-radius: var(--radius);
  transition: var(--transition);
  text-align: center;
}

.card:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
  transform: translateY(-2px);
}

.card h3 {
  margin-top: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.card p {
  margin-bottom: 0;
}

.card img {
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  margin-bottom: var(--spacing-md);
}

/* ===== IMAGES ===== */
img {
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius);
}

.image-container {
  overflow: hidden;
  border-radius: var(--radius);
  margin-bottom: var(--spacing-lg);
}

.image-container img {
  width: 100%;
  height: auto;
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-block;
  padding: var(--spacing-md) var(--spacing-lg);
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 600;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
}

.btn-primary {
  background-color: var(--color-accent-warm);
  color: var(--color-white);
}

.btn-primary:hover {
  background-color: #d68910;
  transform: translateY(-2px);
}

.btn-secondary {
  background-color: var(--color-accent-green);
  color: var(--color-white);
}

.btn-secondary:hover {
  background-color: #229954;
  transform: translateY(-2px);
}

/* ===== LISTS ===== */
ul, ol {
  margin-left: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

li {
  margin-bottom: var(--spacing-sm);
  line-height: 1.65;
}

/* ===== FOOTER ===== */
footer {
  background-color: var(--color-primary);
  color: var(--color-white);
  padding: var(--spacing-xxl) var(--spacing-xl);
  margin-top: var(--spacing-xxl);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
  max-width: 1440px;
  margin: 0 auto;
  margin-bottom: var(--spacing-xl);
}

.footer-section h4 {
  color: var(--color-white);
  margin-bottom: var(--spacing-md);
}

.footer-section p,
.footer-section a {
  color: var(--color-secondary);
  font-size: 0.9rem;
  line-height: 1.8;
}

.footer-section a:hover {
  color: var(--color-accent-warm);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.2);
  padding-top: var(--spacing-lg);
  text-align: center;
  color: var(--color-secondary);
  font-size: 0.85rem;
}

/* ===== DISCLAIMER BLOCK ===== */
.disclaimer-block {
  background-color: var(--color-bg-light);
  border-left: 4px solid var(--color-accent-warm);
  padding: var(--spacing-lg);
  margin: var(--spacing-xxl) 0;
  border-radius: var(--radius);
}

.disclaimer-block h4 {
  color: var(--color-primary);
  margin-bottom: var(--spacing-md);
}

.disclaimer-block p {
  margin-bottom: var(--spacing-sm);
  font-size: 0.95rem;
}

/* ===== SECTION BACKGROUNDS ===== */
.section-light {
  background-color: var(--color-bg-light);
}

.section-primary {
  background-color: var(--color-primary);
  color: var(--color-white);
}

.section-primary h2,
.section-primary h3 {
  color: var(--color-white);
}

.section-primary p {
  color: var(--color-secondary);
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 1024px) {
  .container {
    padding: 0 var(--spacing-lg);
  }
  
  h1 {
    font-size: 2.5rem;
  }
  
  h2 {
    font-size: 1.75rem;
  }
  
  .two-column,
  .two-column-reverse {
    grid-template-columns: 1fr;
  }
  
  .two-column-reverse > :first-child {
    order: 1;
  }
  
  .two-column-reverse > :last-child {
    order: 2;
  }
  
  .grid-three {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .footer-content {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  :root {
    --spacing-xl: 40px;
    --spacing-xxl: 60px;
  }
  
  .header-wrapper {
    padding: var(--spacing-md) var(--spacing-lg);
  }
  
  nav ul {
    gap: var(--spacing-md);
  }
  
  nav a {
    font-size: 0.85rem;
  }
  
  h1 {
    font-size: 2rem;
  }
  
  h2 {
    font-size: 1.5rem;
  }
  
  h3 {
    font-size: 1.25rem;
  }
  
  section {
    padding: var(--spacing-xl) 0;
  }
  
  .grid-three {
    grid-template-columns: 1fr;
  }
  
  main {
    margin-top: 70px;
  }
}

@media (max-width: 480px) {
  :root {
    --spacing-lg: 20px;
    --spacing-xl: 30px;
    --spacing-xxl: 40px;
  }
  
  .container {
    padding: 0 var(--spacing-md);
  }
  
  .header-wrapper {
    flex-direction: column;
    gap: var(--spacing-md);
  }
  
  nav ul {
    flex-direction: column;
    gap: var(--spacing-sm);
  }
  
  h1 {
    font-size: 1.5rem;
  }
  
  h2 {
    font-size: 1.25rem;
  }
  
  .hero {
    padding: var(--spacing-xl) var(--spacing-md);
  }
  
  .hero h1 {
    font-size: 1.75rem;
  }
  
  .two-column {
    gap: var(--spacing-lg);
  }
  
  .grid-three {
    gap: var(--spacing-md);
  }
  
  .btn {
    width: 100%;
    text-align: center;
  }
}

/* ===== ANIMATIONS ===== */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  animation: fadeIn 0.6s ease forwards;
}

/* ===== UTILITY CLASSES ===== */
.text-center {
  text-align: center;
}

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

.text-accent-warm {
  color: var(--color-accent-warm);
}

.text-accent-green {
  color: var(--color-accent-green);
}

.margin-top {
  margin-top: var(--spacing-lg);
}

.margin-bottom {
  margin-bottom: var(--spacing-lg);
}

.margin-vertical {
  margin: var(--spacing-lg) 0;
}

.max-width-container {
  max-width: 800px;
  margin: 0 auto;
}