:root {
  /* Design System: CAT RNSIT */
  --primary-color: #8C0014; /* Deep Maroon / Crimson */
  --primary-hover: #AB0018;
  --secondary-color: #1A1A1A; /* Charcoal Black */
  --accent-color: #FFB300; /* Warm Amber / Gold */
  --accent-hover: #FFC107;
  
  --bg-color: #FFFFFF;
  --bg-light: #F8F9FA; /* Off-white */
  --surface-color: #FFFFFF;
  --text-main: #1A1A1A;
  --text-muted: #555555;
  --border-color: #E2E8F0;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-heading: 'Merriweather', 'Georgia', serif;

  /* Layout */
  --container-width: 1200px;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-heading);
  color: var(--primary-color);
  line-height: 1.2;
}

.text-center { text-align: center; }
.bg-light { background-color: var(--bg-light); }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.3s ease;
  border: none;
  font-family: var(--font-sans);
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
}

.btn-primary { background-color: var(--primary-color); color: white; }
.btn-primary:hover { background-color: var(--primary-hover); transform: translateY(-2px); box-shadow: var(--shadow-md); }

.btn-accent { background-color: var(--accent-color); color: var(--secondary-color); }
.btn-accent:hover { background-color: var(--accent-hover); transform: translateY(-2px); box-shadow: var(--shadow-md); }

.btn-outline { border: 2px solid var(--primary-color); color: var(--primary-color); background: transparent; }
.btn-outline:hover { background-color: var(--primary-color); color: white; }

/* Navigation */
#navbar {
  position: fixed;
  top: 0;
  width: 100%;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
  z-index: 1000;
  transition: all 0.3s ease;
}

.nav-container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo-group {
  display: flex;
  align-items: center;
  gap: 1rem;
  text-decoration: none;
}

.logo-group img {
  height: 40px;
  width: auto;
}

.brand-name {
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--primary-color);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-links a:not(.btn) {
  text-decoration: none;
  color: var(--text-main);
  font-weight: 500;
  transition: color 0.2s;
}

.nav-links a:not(.btn):hover {
  color: var(--primary-color);
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-main);
}

/* Hero Section */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--bg-light) 0%, rgba(140, 0, 20, 0.05) 100%);
  padding: 6rem 2rem 2rem;
  text-align: center;
}

.hero-content {
  max-width: 800px;
}

.hero-title {
  font-size: clamp(2.5rem, 5vw, 4rem);
  color: var(--secondary-color);
  margin-bottom: 1.5rem;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-muted);
  margin-bottom: 2.5rem;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
}

/* Sections */
.section {
  padding: 5rem 2rem;
}

.section-container {
  max-width: var(--container-width);
  margin: 0 auto;
}

.section h2 {
  font-size: 2.5rem;
  margin-bottom: 3rem;
}

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

.section-dark h2 { color: var(--accent-color); }

/* About Grid */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.about-text p {
  font-size: 1.125rem;
  margin-bottom: 1rem;
}

.about-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.stat-card {
  background: var(--bg-light);
  padding: 2rem;
  border-radius: var(--radius-lg);
  text-align: center;
  border: 1px solid var(--border-color);
}

.stat-card h3 {
  font-size: 3rem;
  margin-bottom: 0.5rem;
}

/* Events Grid */
.events-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.event-card {
  background: rgba(255, 255, 255, 0.05);
  padding: 2.5rem;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255,255,255,0.1);
  transition: transform 0.3s, box-shadow 0.3s;
}

.event-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 30px rgba(0,0,0,0.5);
  border-color: var(--accent-color);
}

.event-card h3 {
  font-size: 2rem;
  color: white;
  margin-bottom: 0.5rem;
}

.event-type {
  color: var(--accent-color);
  font-weight: 600;
  margin-bottom: 1.5rem;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* Committees */
.committee-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}

.committee-card {
  background: white;
  padding: 2rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  transition: all 0.3s;
}

.committee-card:hover {
  border-color: var(--primary-color);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.committee-icon {
  margin-bottom: 1rem;
  color: var(--primary-color);
}

.committee-card h3 {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
  font-family: var(--font-sans);
}

.committee-card p {
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* Footer */
footer {
  background: var(--secondary-color);
  color: white;
  padding: 4rem 2rem 2rem;
}

.footer-container {
  max-width: var(--container-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 4rem;
  margin-bottom: 3rem;
}

.footer-brand p {
  color: #A0AEC0;
  margin-top: 1rem;
  max-width: 400px;
}

.footer-links h3 { color: white; margin-bottom: 1.5rem; font-size: 1.25rem; }
.footer-links a { display: block; color: #A0AEC0; text-decoration: none; margin-bottom: 0.5rem; transition: color 0.2s; }
.footer-links a:hover { color: var(--accent-color); }

.footer-bottom {
  max-width: var(--container-width);
  margin: 0 auto;
  padding-top: 2rem;
  border-top: 1px solid rgba(255,255,255,0.1);
  text-align: center;
  color: #A0AEC0;
  font-size: 0.875rem;
}

/* Animations */
.animate-fade {
  opacity: 0;
  transform: translateY(20px);
  animation: fadeUp 0.8s ease forwards;
}

.animate-on-scroll {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.animate-on-scroll.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@keyframes fadeUp {
  to { opacity: 1; transform: translateY(0); }
}

/* Responsive */
@media (max-width: 900px) {
  .about-grid { grid-template-columns: 1fr; gap: 2rem; }
  .footer-container { grid-template-columns: 1fr; gap: 2rem; }
  .hero-title { font-size: 2.5rem; }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background: white;
    flex-direction: column;
    padding: 1.5rem;
    box-shadow: var(--shadow-md);
  }
  .nav-links.active { display: flex; }
  .mobile-menu-btn { display: block; }
  .hero-actions { flex-direction: column; }
}