/* ===================================
   QUAJOL - Institutional Knowledge Portal
   Main Stylesheet
   =================================== */

:root {
  --color-dark-gray: #333333;
  --color-accent-blue: #6A8A9E;
  --color-accent-beige: #DED7C8;
  --color-accent-green: #9FB8A0;
  --color-light-gray: #F5F5F5;
  --color-white: #FFFFFF;
  --color-border: #E0E0E0;
  
  --font-serif: 'Merriweather', 'Lora', serif;
  --font-sans: 'Source Sans Pro', 'Lato', sans-serif;
  
  --spacing-xs: 8px;
  --spacing-sm: 16px;
  --spacing-md: 24px;
  --spacing-lg: 32px;
  --spacing-xl: 48px;
  --spacing-2xl: 64px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-serif);
  color: var(--color-dark-gray);
  background-color: var(--color-white);
  line-height: 1.6;
  font-size: 16px;
}

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

h1 {
  font-family: var(--font-sans);
  font-size: 3.5rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-lg);
  color: var(--color-dark-gray);
  letter-spacing: -0.02em;
}

h2 {
  font-family: var(--font-sans);
  font-size: 2.5rem;
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: var(--spacing-md);
  color: var(--color-dark-gray);
}

h3 {
  font-family: var(--font-sans);
  font-size: 1.75rem;
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: var(--spacing-sm);
  color: var(--color-dark-gray);
}

p {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  line-height: 1.7;
  margin-bottom: var(--spacing-md);
  color: var(--color-dark-gray);
}

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

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

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

header {
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.header-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: var(--spacing-md) var(--spacing-sm);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-family: var(--font-sans);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-dark-gray);
  letter-spacing: 0.05em;
}

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

nav a {
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-dark-gray);
  position: relative;
  transition: color 0.3s ease;
}

nav a.active {
  color: var(--color-accent-blue);
}

nav a.active::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--color-accent-blue);
}

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

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--spacing-sm);
}

.section {
  padding: var(--spacing-2xl) 0;
}

.section.full-width {
  width: 100vw;
  position: relative;
  left: 50%;
  right: 50%;
  margin-left: -50vw;
  margin-right: -50vw;
  padding-left: var(--spacing-sm);
  padding-right: var(--spacing-sm);
}

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

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

.section.bg-green {
  background-color: var(--color-accent-green);
  color: var(--color-white);
}

.section.bg-green h2,
.section.bg-green h3,
.section.bg-green p {
  color: var(--color-white);
}

.section.bg-blue {
  background-color: var(--color-accent-blue);
  color: var(--color-white);
}

.section.bg-blue h2,
.section.bg-blue h3,
.section.bg-blue p {
  color: var(--color-white);
}

/* ===================================
   GRID SYSTEM
   =================================== */

.grid {
  display: grid;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

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

.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

.grid-4 {
  grid-template-columns: repeat(4, 1fr);
}

/* ===================================
   CARDS
   =================================== */

.card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: var(--spacing-lg);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  transition: box-shadow 0.3s ease, transform 0.3s ease;
}

.card:hover {
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
  transform: translateY(-2px);
}

.card img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-radius: 4px;
  margin-bottom: var(--spacing-md);
}

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

/* ===================================
   BUTTONS
   =================================== */

.btn {
  display: inline-block;
  padding: 12px 24px;
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  border: 2px solid var(--color-accent-blue);
  border-radius: 4px;
  background-color: transparent;
  color: var(--color-accent-blue);
  cursor: pointer;
  transition: all 0.3s ease;
}

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

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

.btn-primary:hover {
  background-color: var(--color-dark-gray);
  border-color: var(--color-dark-gray);
}

/* ===================================
   IMAGES
   =================================== */

img {
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: 4px;
}

.img-large {
  width: 100%;
  height: 500px;
  object-fit: cover;
  border-radius: 4px;
}

.img-medium {
  width: 100%;
  height: 350px;
  object-fit: cover;
  border-radius: 4px;
}

.img-small {
  width: 100%;
  height: 250px;
  object-fit: cover;
  border-radius: 4px;
}

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

.hero {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 600px;
  background: linear-gradient(135deg, rgba(51, 51, 51, 0.85), rgba(106, 138, 158, 0.85)),
              url('/images/hero-bg.jpg') center/cover no-repeat;
  color: var(--color-white);
  text-align: center;
  padding: var(--spacing-2xl) var(--spacing-sm);
}

.hero h1 {
  color: var(--color-white);
  font-size: 4rem;
  margin-bottom: var(--spacing-lg);
}

.hero p {
  color: var(--color-white);
  font-size: 1.3rem;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

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

footer {
  background-color: var(--color-dark-gray);
  color: var(--color-white);
  padding: var(--spacing-xl) var(--spacing-sm);
  margin-top: var(--spacing-2xl);
  border-top: 1px solid var(--color-border);
}

.footer-container {
  max-width: 1280px;
  margin: 0 auto;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

.footer-section h4 {
  font-family: var(--font-sans);
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  color: var(--color-white);
}

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

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

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

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

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding-top: var(--spacing-lg);
  text-align: center;
  font-size: 0.95rem;
  opacity: 0.8;
}

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

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

label {
  display: block;
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
  color: var(--color-dark-gray);
}

input[type="text"],
input[type="email"],
input[type="tel"],
textarea {
  width: 100%;
  padding: 12px;
  font-family: var(--font-serif);
  font-size: 1rem;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  background-color: var(--color-white);
  color: var(--color-dark-gray);
  transition: border-color 0.3s ease;
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="tel"]:focus,
textarea:focus {
  outline: none;
  border-color: var(--color-accent-blue);
  box-shadow: 0 0 0 3px rgba(106, 138, 158, 0.1);
}

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

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

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

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

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

.mt-xs { margin-top: var(--spacing-xs); }
.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-xs { margin-bottom: var(--spacing-xs); }
.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); }

.pt-xs { padding-top: var(--spacing-xs); }
.pt-sm { padding-top: var(--spacing-sm); }
.pt-md { padding-top: var(--spacing-md); }
.pt-lg { padding-top: var(--spacing-lg); }

.pb-xs { padding-bottom: var(--spacing-xs); }
.pb-sm { padding-bottom: var(--spacing-sm); }
.pb-md { padding-bottom: var(--spacing-md); }
.pb-lg { padding-bottom: var(--spacing-lg); }

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

@media (max-width: 768px) {
  h1 {
    font-size: 2.5rem;
  }
  
  h2 {
    font-size: 1.75rem;
  }
  
  h3 {
    font-size: 1.4rem;
  }
  
  p {
    font-size: 1rem;
  }
  
  nav ul {
    gap: var(--spacing-md);
    flex-direction: column;
  }
  
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }
  
  .hero {
    min-height: 400px;
  }
  
  .hero h1 {
    font-size: 2.5rem;
  }
  
  .img-large {
    height: 300px;
  }
  
  .img-medium {
    height: 250px;
  }
}

@media (max-width: 480px) {
  h1 {
    font-size: 2rem;
  }
  
  h2 {
    font-size: 1.5rem;
  }
  
  .section {
    padding: var(--spacing-xl) 0;
  }
  
  nav ul {
    flex-direction: column;
    gap: var(--spacing-sm);
  }
}