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

@import url('https://fonts.googleapis.com/css2?family=Source+Sans+Pro:wght@400;600;700&family=Lora:wght@400;500;600&display=swap');

/* ============ CSS Variables ============ */
:root {
  --primary: #1A202C;
  --primary-light: #2D3748;
  --secondary: #F7FAFC;
  --secondary-alt: #EDF2F7;
  --accent-blue: #63B3ED;
  --accent-orange: #F6AD55;
  --accent-green: #48BB78;
  --text-dark: #1A202C;
  --text-light: #A0AEC0;
  --border-color: #CBD5E0;
  --white: #FFFFFF;
  
  --font-sans: 'Source Sans Pro', sans-serif;
  --font-serif: 'Lora', serif;
  
  --spacing-unit: 1rem;
  --max-width: 1440px;
  --transition: all 0.3s ease-in-out;
}

/* ============ Global Styles ============ */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

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

/* ============ Typography ============ */
h1 {
  font-family: var(--font-sans);
  font-size: 3rem;
  font-weight: 700;
  line-height: 1.2;
  color: var(--text-dark);
  margin-bottom: 1.5rem;
  text-transform: uppercase;
  letter-spacing: -1px;
}

h2 {
  font-family: var(--font-sans);
  font-size: 2.5rem;
  font-weight: 700;
  line-height: 1.3;
  color: var(--text-dark);
  margin-bottom: 1.25rem;
  margin-top: 3rem;
}

h3 {
  font-family: var(--font-sans);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: 0.75rem;
  margin-top: 1.5rem;
}

p {
  font-family: var(--font-serif);
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text-dark);
  margin-bottom: 1.5rem;
}

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

a:hover {
  color: var(--primary-light);
  border-bottom: 1px solid var(--accent-blue);
}

/* ============ Container & Layout ============ */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
}

.container-fluid {
  width: 100%;
}

.section {
  padding: 5rem 0;
  position: relative;
}

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

.section.dark h1,
.section.dark h2,
.section.dark h3,
.section.dark p {
  color: var(--white);
}

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

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

/* ============ Grid System ============ */
.grid {
  display: grid;
  gap: 2rem;
  margin-bottom: 3rem;
}

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

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

.grid-col-span-2 {
  grid-column: span 2;
}

/* ============ Images ============ */
img {
  max-width: 100%;
  height: auto;
  display: block;
}

.image-full {
  width: 100%;
  height: auto;
  object-fit: cover;
}

.image-container {
  overflow: hidden;
  border-radius: 4px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.image-container img {
  transition: var(--transition);
}

.image-container:hover img {
  transform: scale(1.02);
  filter: brightness(0.95);
}

/* ============ Cards ============ */
.card {
  background-color: var(--white);
  border: 1px solid var(--border-color);
  padding: 2rem;
  border-radius: 4px;
  transition: var(--transition);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.05);
}

.card:hover {
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
  transform: translateY(-2px);
}

.card h3 {
  margin-top: 0;
  color: var(--accent-blue);
}

/* ============ Header ============ */
header {
  background-color: var(--white);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
  padding: 1.5rem 0;
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
}

.logo {
  font-family: var(--font-sans);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 2px;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo img {
  width: 32px;
  height: 32px;
}

nav ul {
  list-style: none;
  display: flex;
  gap: 2rem;
}

nav a {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-dark);
  text-transform: uppercase;
  border-bottom: 2px solid transparent;
}

nav a:hover,
nav a.active {
  color: var(--accent-blue);
  border-bottom: 2px solid var(--accent-blue);
}

/* ============ Footer ============ */
footer {
  background-color: var(--primary);
  color: var(--white);
  padding: 5rem 0;
  margin-top: 8rem;
}

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

footer h3 {
  color: var(--white);
  font-size: 1.1rem;
  margin-top: 0;
  margin-bottom: 1rem;
}

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

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

footer ul {
  list-style: none;
}

footer ul li {
  margin-bottom: 0.75rem;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 2rem;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-light);
}

.footer-bottom p {
  margin-bottom: 0.5rem;
}

/* ============ Buttons ============ */
.btn {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  padding: 0.875rem 1.75rem;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  display: inline-block;
  text-align: center;
}

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

.btn-primary:hover {
  background-color: #4A9FD8;
}

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

.btn-secondary:hover {
  background-color: #E8934C;
}

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

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

/* ============ Lists ============ */
ul, ol {
  margin: 0 0 1.5rem 2rem;
}

li {
  margin-bottom: 0.75rem;
  line-height: 1.8;
}

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

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

.mt-1 { margin-top: 1rem; }
.mt-2 { margin-top: 2rem; }
.mt-3 { margin-top: 3rem; }
.mt-4 { margin-top: 4rem; }
.mt-5 { margin-top: 5rem; }

.mb-1 { margin-bottom: 1rem; }
.mb-2 { margin-bottom: 2rem; }
.mb-3 { margin-bottom: 3rem; }
.mb-4 { margin-bottom: 4rem; }
.mb-5 { margin-bottom: 5rem; }

.py-1 { padding: 1rem 0; }
.py-2 { padding: 2rem 0; }
.py-3 { padding: 3rem 0; }
.py-4 { padding: 4rem 0; }
.py-5 { padding: 5rem 0; }
.py-6 { padding: 6rem 0; }

.px-1 { padding: 0 1rem; }
.px-2 { padding: 0 2rem; }
.px-3 { padding: 0 3rem; }

.flex {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

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

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

.gap-1 { gap: 1rem; }
.gap-2 { gap: 2rem; }
.gap-3 { gap: 3rem; }

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

.bg-light { background-color: var(--secondary); }
.bg-dark { background-color: var(--primary); }
.bg-white { background-color: var(--white); }

/* ============ Responsive Design ============ */
@media (max-width: 1024px) {
  h1 {
    font-size: 2.5rem;
  }

  h2 {
    font-size: 2rem;
  }

  .grid-2,
  footer .container {
    grid-template-columns: 1fr;
  }

  .grid-col-span-2 {
    grid-column: span 1;
  }

  nav ul {
    gap: 1rem;
  }

  nav a {
    font-size: 0.85rem;
  }
}

@media (max-width: 768px) {
  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  p {
    font-size: 0.95rem;
  }

  .section {
    padding: 3rem 0;
  }

  .container {
    padding: 0 1.5rem;
  }

  .header-content {
    padding: 0 1.5rem;
  }

  footer .container {
    grid-template-columns: 1fr;
  }

  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
  }

  nav ul {
    flex-direction: column;
    gap: 0.5rem;
  }

  .logo {
    font-size: 1.2rem;
  }
}

@media (max-width: 480px) {
  h1 {
    font-size: 1.5rem;
  }

  h2 {
    font-size: 1.25rem;
  }

  p {
    font-size: 0.9rem;
  }

  .section {
    padding: 2rem 0;
  }

  footer {
    padding: 2rem 0;
  }
}