/* ============================================
   HASOMA - Comprehensive Guide to Dietary Habits
   Museum-Inspired Design System
   ============================================ */

/* ============================================
   1. CSS Variables & Color System
   ============================================ */

:root {
  /* Primary Colors */
  --color-primary: #6A7B8E;
  --color-secondary: #5F9EA0;
  --color-accent: #CC7722;
  --color-light: #F8F8F8;
  
  /* Neutral Palette */
  --color-white: #FFFFFF;
  --color-black: #000000;
  --color-gray-dark: #3C3C3C;
  --color-gray-medium: #666666;
  --color-gray-light: #E8E8E8;
  --color-gray-lighter: #F2F2F2;
  
  /* Typography */
  --font-serif: 'Charter', 'Source Serif Pro', Georgia, serif;
  --font-sans: 'Montserrat', 'Lato', 'Segoe UI', sans-serif;
  
  /* Font Sizes */
  --fs-h1: 56px;
  --fs-h2: 40px;
  --fs-h3: 28px;
  --fs-h4: 20px;
  --fs-body: 16px;
  --fs-small: 14px;
  
  /* Line Heights */
  --lh-tight: 1.2;
  --lh-normal: 1.5;
  --lh-relaxed: 1.8;
  
  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;
  --spacing-3xl: 64px;
  --spacing-4xl: 96px;
  --spacing-5xl: 128px;
  
  /* Grid & Layout */
  --container-width: 1440px;
  --container-wide: 1680px;
  --grid-columns: 12;
  --grid-gap: 20px;
  
  /* Border Radius */
  --radius-sm: 2px;
  --radius-md: 4px;
  --radius-lg: 8px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 20px rgba(0, 0, 0, 0.12);
  --shadow-xl: 0 16px 32px rgba(0, 0, 0, 0.15);
  
  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-normal: 300ms ease-in-out;
  --transition-slow: 500ms ease-in-out;
}

/* ============================================
   2. Reset & Base Styles
   ============================================ */

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-serif);
  font-size: var(--fs-body);
  line-height: var(--lh-relaxed);
  color: var(--color-gray-dark);
  background-color: var(--color-light);
  letter-spacing: 0.3px;
}

/* ============================================
   3. Typography
   ============================================ */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-sans);
  font-weight: 700;
  line-height: var(--lh-tight);
  color: var(--color-gray-dark);
  margin-bottom: var(--spacing-lg);
}

h1 {
  font-size: var(--fs-h1);
  font-weight: 800;
  margin-bottom: var(--spacing-xl);
  letter-spacing: -0.5px;
}

h2 {
  font-size: var(--fs-h2);
  margin-bottom: var(--spacing-lg);
  letter-spacing: -0.3px;
}

h3 {
  font-size: var(--fs-h3);
  margin-bottom: var(--spacing-md);
  font-weight: 600;
}

h4 {
  font-size: var(--fs-h4);
  margin-bottom: var(--spacing-md);
  font-weight: 600;
}

p {
  margin-bottom: var(--spacing-lg);
  color: var(--color-gray-dark);
}

p:last-child {
  margin-bottom: 0;
}

a {
  color: var(--color-secondary);
  text-decoration: none;
  transition: all var(--transition-normal);
  border-bottom: 1px solid transparent;
}

a:hover {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

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

li {
  margin-bottom: var(--spacing-md);
  color: var(--color-gray-dark);
  line-height: var(--lh-relaxed);
}

strong {
  font-weight: 700;
}

em {
  font-style: italic;
}

/* ============================================
   4. Container & Layout
   ============================================ */

.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.container-wide {
  width: 100%;
  max-width: var(--container-wide);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.section {
  padding: var(--spacing-5xl) 0;
  border-bottom: 1px solid var(--color-gray-light);
}

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

.section-alt {
  background-color: var(--color-gray-lighter);
}

.grid {
  display: grid;
  grid-template-columns: repeat(var(--grid-columns), 1fr);
  gap: var(--grid-gap);
  margin-bottom: var(--spacing-3xl);
}

.grid-item {
  grid-column: span 6;
}

.grid-item-full {
  grid-column: span 12;
}

.grid-item-4 {
  grid-column: span 4;
}

.grid-item-8 {
  grid-column: span 8;
}

.grid-item-3 {
  grid-column: span 3;
}

/* ============================================
   5. Header & Navigation
   ============================================ */

header {
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-gray-light);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-lg) 0;
}

.logo {
  font-family: var(--font-sans);
  font-size: 24px;
  font-weight: 800;
  color: var(--color-primary);
  text-decoration: none;
  letter-spacing: 1px;
}

.logo:hover {
  color: var(--color-accent);
  border-bottom: none;
}

nav ul {
  display: flex;
  gap: var(--spacing-xl);
  list-style: none;
  margin: 0;
}

nav a {
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  color: var(--color-gray-dark);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  padding-bottom: 2px;
  transition: all var(--transition-normal);
}

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

/* ============================================
   6. Hero Section
   ============================================ */

.hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-gray-dark) 100%);
  color: var(--color-white);
  padding: var(--spacing-4xl) 0;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1440 600"><rect fill="rgba(255,255,255,0.03)" width="1440" height="600"/></svg>');
  opacity: 0.1;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
}

.hero h1 {
  color: var(--color-white);
  margin-bottom: var(--spacing-xl);
  font-size: 64px;
}

.hero p {
  color: rgba(255, 255, 255, 0.9);
  font-size: 20px;
  max-width: 800px;
  margin: 0 auto var(--spacing-lg);
}

/* ============================================
   7. Buttons
   ============================================ */

.btn {
  display: inline-block;
  padding: var(--spacing-md) var(--spacing-xl);
  font-family: var(--font-sans);
  font-size: var(--fs-small);
  font-weight: 600;
  text-align: center;
  text-decoration: none;
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-normal);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

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

.btn-primary:hover {
  background-color: #B8640A;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-bottom: none;
}

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

.btn-secondary:hover {
  background-color: #4A7F88;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-bottom: none;
}

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

.btn-outline:hover {
  background-color: var(--color-primary);
  color: var(--color-white);
  border-bottom: none;
}

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

/* ============================================
   8. Cards
   ============================================ */

.card {
  background-color: var(--color-white);
  border: 1px solid var(--color-gray-light);
  border-radius: var(--radius-md);
  padding: var(--spacing-xl);
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-sm);
}

.card:hover {
  transform: scale(1.01);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-secondary);
}

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

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

.card p:last-child {
  margin-bottom: 0;
}

/* ============================================
   9. Images
   ============================================ */

img {
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius-md);
}

.image-wrapper {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-md);
  background-color: var(--color-gray-lighter);
}

.image-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.image-full-width {
  width: 100vw;
  position: relative;
  left: 50%;
  right: 50%;
  margin-left: -50vw;
  margin-right: -50vw;
  margin-bottom: var(--spacing-3xl);
}

.image-featured {
  width: 100%;
  height: 500px;
  object-fit: cover;
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-3xl);
  box-shadow: var(--shadow-lg);
}

/* ============================================
   10. Footer
   ============================================ */

footer {
  background-color: var(--color-primary);
  color: var(--color-white);
  padding: var(--spacing-3xl) 0;
  margin-top: var(--spacing-5xl);
}

footer a {
  color: var(--color-accent);
}

footer a:hover {
  color: var(--color-light);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-2xl);
  margin-bottom: var(--spacing-2xl);
}

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

.footer-section ul {
  list-style: none;
  margin: 0;
}

.footer-section ul li {
  margin-bottom: var(--spacing-sm);
  color: rgba(255, 255, 255, 0.8);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.2);
  padding-top: var(--spacing-xl);
  text-align: center;
  font-size: var(--fs-small);
  color: rgba(255, 255, 255, 0.7);
}

/* ============================================
   11. Forms
   ============================================ */

form {
  max-width: 600px;
  margin: var(--spacing-2xl) 0;
}

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

label {
  display: block;
  font-family: var(--font-sans);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  color: var(--color-gray-dark);
}

input,
textarea,
select {
  width: 100%;
  padding: var(--spacing-md);
  font-family: var(--font-serif);
  font-size: var(--fs-body);
  border: 1px solid var(--color-gray-light);
  border-radius: var(--radius-md);
  background-color: var(--color-white);
  color: var(--color-gray-dark);
  transition: all var(--transition-normal);
}

input:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--color-secondary);
  box-shadow: 0 0 0 3px rgba(95, 158, 160, 0.1);
}

textarea {
  resize: vertical;
  min-height: 150px;
}

/* ============================================
   12. Lists & Content
   ============================================ */

.content-wrapper {
  line-height: var(--lh-relaxed);
}

.content-wrapper h2 {
  margin-top: var(--spacing-2xl);
}

.content-wrapper h2:first-child {
  margin-top: 0;
}

.list-checked li::before {
  content: '✓ ';
  color: var(--color-secondary);
  font-weight: bold;
  margin-right: var(--spacing-sm);
}

/* ============================================
   13. Dividers & Separators
   ============================================ */

.divider {
  height: 1px;
  background-color: var(--color-gray-light);
  margin: var(--spacing-3xl) 0;
}

.divider-accent {
  height: 3px;
  background-color: var(--color-accent);
  width: 60px;
  margin: var(--spacing-2xl) 0;
}

/* ============================================
   14. Responsive Design
   ============================================ */

@media (max-width: 1024px) {
  :root {
    --fs-h1: 48px;
    --fs-h2: 32px;
    --fs-h3: 24px;
    --container-width: 90vw;
  }
  
  .grid-item {
    grid-column: span 12;
  }
  
  .grid-item-4 {
    grid-column: span 6;
  }
  
  .grid-item-8 {
    grid-column: span 12;
  }
  
  .footer-content {
    grid-template-columns: repeat(2, 1fr);
  }
  
  nav ul {
    gap: var(--spacing-lg);
  }
}

@media (max-width: 768px) {
  :root {
    --fs-h1: 36px;
    --fs-h2: 28px;
    --fs-h3: 20px;
    --spacing-5xl: 64px;
    --spacing-4xl: 48px;
    --grid-gap: 16px;
  }
  
  .section {
    padding: var(--spacing-3xl) 0;
  }
  
  .container {
    padding: 0 var(--spacing-md);
  }
  
  .header-content {
    flex-direction: column;
    gap: var(--spacing-lg);
  }
  
  nav ul {
    gap: var(--spacing-md);
    font-size: 14px;
  }
  
  .hero {
    padding: var(--spacing-2xl) 0;
  }
  
  .hero h1 {
    font-size: 36px;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
  
  .image-featured {
    height: 300px;
  }
}

@media (max-width: 480px) {
  :root {
    --fs-h1: 28px;
    --fs-h2: 22px;
    --fs-h3: 18px;
    --fs-body: 15px;
  }
  
  .section {
    padding: var(--spacing-2xl) 0;
  }
  
  .hero h1 {
    font-size: 28px;
  }
  
  .hero p {
    font-size: 16px;
  }
  
  .card {
    padding: var(--spacing-lg);
  }
  
  .btn {
    font-size: 12px;
    padding: var(--spacing-sm) var(--spacing-lg);
  }
}

/* ============================================
   15. Utility Classes
   ============================================ */

.text-center {
  text-align: center;
}

.text-left {
  text-align: left;
}

.text-right {
  text-align: right;
}

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

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

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

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }
.mt-4 { margin-top: var(--spacing-2xl); }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }
.mb-4 { margin-bottom: var(--spacing-2xl); }

.hidden {
  display: none;
}

.visible {
  display: block;
}

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