/* ========================================
   Wijaro - The Science of Healthy Weight Management
   Design System & Global Styles
   ======================================== */

:root {
  /* Primary Colors */
  --color-primary: #1a3a52;        /* Deep Slate Blue */
  --color-primary-dark: #0f2438;
  --color-primary-light: #2a5a82;
  
  /* Secondary & Accent Colors */
  --color-accent-green: #9dba9f;   /* Soft Sage Green */
  --color-accent-terracotta: #c9876b; /* Warm Terracotta */
  --color-accent-gold: #a89a6f;    /* Muted Gold */
  
  /* Neutrals */
  --color-bg-light: #f5f3f0;       /* Very soft cream/off-white */
  --color-bg-white: #ffffff;
  --color-text-primary: #2d2d2d;   /* Dark gray */
  --color-text-secondary: #6b7280; /* Medium gray */
  --color-border: #d4d2d0;         /* Light border */
  
  /* Spacing Scale */
  --spacing-xs: 8px;
  --spacing-sm: 16px;
  --spacing-md: 24px;
  --spacing-lg: 40px;
  --spacing-xl: 80px;
  --spacing-xxl: 160px;
  
  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-size-base: 16px;
  --line-height-body: 1.6;
  --line-height-heading: 1.2;
}

/* ========================================
   RESET & BASE STYLES
   ======================================== */

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

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

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg-white);
  color: var(--color-text-primary);
  line-height: var(--line-height-body);
  font-size: var(--font-size-base);
}

/* ========================================
   TYPOGRAPHY
   ======================================== */

h1, h2, h3, h4, h5, h6 {
  line-height: var(--line-height-heading);
  font-weight: 600;
  margin-bottom: var(--spacing-md);
}

h1 {
  font-size: 3.5rem;
  margin-bottom: var(--spacing-lg);
  color: var(--color-primary);
  letter-spacing: -0.02em;
}

h2 {
  font-size: 2.75rem;
  margin-bottom: var(--spacing-md);
  color: var(--color-primary);
}

h3 {
  font-size: 1.75rem;
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
}

h4 {
  font-size: 1.25rem;
  color: var(--color-primary-light);
  margin-bottom: var(--spacing-sm);
}

p {
  margin-bottom: var(--spacing-md);
  max-width: 65ch;
}

a {
  color: var(--color-accent-green);
  text-decoration: none;
  transition: color 0.3s ease;
}

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

/* ========================================
   LAYOUT & CONTAINER
   ======================================== */

.container {
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.container-full {
  width: 100%;
}

/* ========================================
   HEADER & NAVIGATION
   ======================================== */

header {
  background-color: var(--color-primary);
  color: var(--color-bg-light);
  padding: var(--spacing-md) 0;
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

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

.logo {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-bg-light);
  letter-spacing: -0.01em;
}

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

nav a {
  color: var(--color-bg-light);
  font-size: 0.95rem;
  font-weight: 500;
  position: relative;
  padding-bottom: 4px;
  transition: color 0.3s ease;
}

nav a:after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-accent-green);
  transition: width 0.3s ease;
}

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

nav a:hover {
  color: var(--color-accent-green);
}

/* Mobile Menu Toggle */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-bg-light);
  font-size: 1.5rem;
  cursor: pointer;
}

/* ========================================
   SECTIONS & SPACING
   ======================================== */

section {
  padding: var(--spacing-xl) 0;
}

section.full-width {
  width: 100%;
  padding-left: 0;
  padding-right: 0;
}

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

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

/* ========================================
   GRID & FLEXBOX LAYOUT
   ======================================== */

.grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--spacing-md);
}

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

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

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

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

.flex {
  display: flex;
  gap: var(--spacing-md);
}

.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

.flex-column {
  display: flex;
  flex-direction: column;
}

.flex-spacer {
  flex: 1;
}

/* ========================================
   IMAGES & MEDIA
   ======================================== */

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

.image-container {
  overflow: hidden;
  border-radius: 4px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
}

.image-container img {
  width: 100%;
  height: auto;
  transition: transform 0.3s ease;
}

.image-container:hover img {
  transform: scale(1.02);
}

figure {
  margin: var(--spacing-md) 0;
}

figcaption {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-top: var(--spacing-sm);
  font-style: italic;
}

/* ========================================
   CARDS & COMPONENTS
   ======================================== */

.card {
  background-color: var(--color-bg-white);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: var(--spacing-md);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
  transition: all 0.3s ease;
}

.card:hover {
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.12);
  border-color: var(--color-accent-green);
}

.card-header {
  margin-bottom: var(--spacing-md);
  padding-bottom: var(--spacing-md);
  border-bottom: 1px solid var(--color-border);
}

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

.card-footer {
  border-top: 1px solid var(--color-border);
  padding-top: var(--spacing-md);
  margin-top: var(--spacing-md);
}

/* ========================================
   BUTTONS & LINKS
   ======================================== */

.btn {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-md);
  background-color: var(--color-accent-green);
  color: var(--color-bg-white);
  border: none;
  border-radius: 4px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  text-align: center;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.btn:hover {
  background-color: var(--color-accent-terracotta);
  transform: translateY(-2px);
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
}

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

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

.btn-secondary {
  background-color: transparent;
  color: var(--color-accent-green);
  border: 2px solid var(--color-accent-green);
}

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

.btn-small {
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: 0.85rem;
}

/* ========================================
   FORMS
   ======================================== */

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

.form-group {
  margin-bottom: var(--spacing-md);
  display: flex;
  flex-direction: column;
}

label {
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
  color: var(--color-primary);
  font-size: 0.95rem;
}

input,
textarea,
select {
  font-family: var(--font-sans);
  font-size: 1rem;
  padding: var(--spacing-sm);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  background-color: var(--color-bg-white);
  color: var(--color-text-primary);
  transition: border-color 0.3s ease;
}

input:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--color-accent-green);
  box-shadow: 0 0 0 3px rgba(157, 186, 159, 0.1);
}

textarea {
  resize: vertical;
  min-height: 120px;
}

.checkbox-group,
.radio-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

/* ========================================
   FOOTER
   ======================================== */

footer {
  background-color: var(--color-primary);
  color: var(--color-bg-light);
  padding: var(--spacing-xl) 0 var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.footer-content {
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

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

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

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

.footer-section ul li {
  margin-bottom: var(--spacing-sm);
}

.footer-section a {
  color: var(--color-bg-light);
  transition: color 0.3s ease;
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--spacing-md);
  text-align: center;
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.7);
}

/* ========================================
   HERO SECTION
   ======================================== */

.hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: var(--color-bg-light);
  padding: var(--spacing-xxl) var(--spacing-md);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero-content {
  max-width: 900px;
  margin: 0 auto;
  position: relative;
  z-index: 2;
}

.hero h1 {
  color: var(--color-bg-light);
  margin-bottom: var(--spacing-lg);
  font-size: 3.5rem;
}

.hero p {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-lg);
  color: rgba(255, 255, 255, 0.9);
}

/* ========================================
   UTILITY CLASSES
   ======================================== */

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

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

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

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

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

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

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }

.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }

.p-sm { padding: var(--spacing-sm); }
.p-md { padding: var(--spacing-md); }
.p-lg { padding: var(--spacing-lg); }

.pt-xl { padding-top: var(--spacing-xl); }
.pb-xl { padding-bottom: var(--spacing-xl); }

.border-top {
  border-top: 1px solid var(--color-border);
}

.border-bottom {
  border-bottom: 1px solid var(--color-border);
}

.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;
}

/* ========================================
   ANIMATIONS
   ======================================== */

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

.slide-up {
  animation: slideUp 0.6s ease-out;
}

/* ========================================
   RESPONSIVE DESIGN
   ======================================== */

@media (max-width: 1024px) {
  .grid-item {
    grid-column: span 12;
  }
  
  .grid-item-8 {
    grid-column: span 12;
  }
  
  .grid-item-4 {
    grid-column: span 12;
  }
  
  h1 {
    font-size: 2.5rem;
  }
  
  h2 {
    font-size: 2rem;
  }
  
  .hero {
    padding: var(--spacing-lg) var(--spacing-md);
  }
}

@media (max-width: 768px) {
  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }
  
  nav ul {
    gap: var(--spacing-sm);
  }
  
  nav a {
    font-size: 0.85rem;
  }
  
  section {
    padding: var(--spacing-lg) 0;
  }
  
  h1 {
    font-size: 2rem;
  }
  
  h2 {
    font-size: 1.5rem;
  }
  
  .hero p {
    font-size: 1rem;
  }
  
  .menu-toggle {
    display: block;
  }
  
  nav {
    display: none;
  }
  
  nav.active {
    display: flex;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--color-primary-dark);
    flex-direction: column;
    padding: var(--spacing-md);
  }
  
  nav.active ul {
    flex-direction: column;
    gap: var(--spacing-sm);
  }
}

@media (max-width: 480px) {
  :root {
    font-size: 14px;
  }
  
  h1 {
    font-size: 1.75rem;
  }
  
  h2 {
    font-size: 1.25rem;
  }
  
  .container {
    padding: 0 var(--spacing-sm);
  }
}