:root {
  --primary-blue: #0A3A5E; /* Deep Blue */
  --secondary-blue: #1A5FA1; /* Brighter Blue */
  --primary-green: #2B7A3C; /* Forest Green */
  --light-green: #E8F5E9; /* Soft Green Background */
  --primary-red: #D32F2F; /* CTA Red */
  --hover-red: #B71C1C; /* Darker Red on hover */
  --bg-color: #F8F9FA; /* Off-white for body */
  --white: #FFFFFF;
  --text-dark: #333333;
  --text-muted: #666666;
  --border-color: #E0E0E0;
  --font-family: 'Inter', sans-serif;
  --shadow-sm: 0 2px 4px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 15px rgba(0,0,0,0.1);
  --radius-md: 8px;
  --radius-lg: 16px;
  --radius-xl: 24px;
}

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

body {
  font-family: var(--font-family);
  background-color: var(--bg-color);
  color: var(--text-dark);
  line-height: 1.6;
}

a {
  text-decoration: none;
  color: inherit;
  transition: color 0.3s ease;
}

ul {
  list-style: none;
}

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
  color: var(--primary-blue);
  font-weight: 700;
  margin-bottom: 0.5rem;
}

h1 { font-size: 3rem; line-height: 1.2; }
h2 { font-size: 2.25rem; }
h3 { font-size: 1.5rem; }

.section-title {
  text-align: center;
  margin-bottom: 3rem;
}

.section-title h2 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.section-title p {
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto;
}

/* Container */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Base Components */
.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  text-align: center;
  cursor: pointer;
  transition: all 0.3s ease;
  border: none;
  font-size: 1rem;
}

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

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

.btn-red {
  background-color: var(--primary-red);
  color: var(--white);
  border-radius: var(--radius-xl); /* Pill shape for donate button */
  padding: 0.75rem 2rem;
}

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

.btn-outline {
  background-color: transparent;
  border: 2px solid var(--border-color);
  color: var(--text-dark);
}

.btn-outline:hover {
  border-color: var(--secondary-blue);
  color: var(--secondary-blue);
}

.card {
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
}

/* Navbar */
.navbar {
  background-color: var(--white);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: var(--shadow-sm);
  padding: 1rem 0;
}

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

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.nav-brand img {
  height: 48px;
}

.nav-brand span {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary-blue);
}

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

.nav-links a.nav-item {
  color: var(--text-dark);
  font-weight: 500;
  position: relative;
}

.nav-links a.nav-item:hover,
.nav-links a.nav-item.active {
  color: var(--secondary-blue);
}

.nav-links a.nav-item::after {
  content: '';
  position: absolute;
  width: 0;
  height: 2px;
  bottom: -4px;
  left: 0;
  background-color: var(--secondary-blue);
  transition: width 0.3s ease;
}

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

.hamburger {
  display: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--primary-blue);
}

/* Footer */
footer {
  background-color: var(--primary-blue);
  color: var(--white);
  padding: 4rem 0 2rem;
  margin-top: 5rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-col h4 {
  color: var(--white);
  margin-bottom: 1.5rem;
  font-size: 1.25rem;
}

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

.footer-col a {
  color: rgba(255, 255, 255, 0.8);
}

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

.newsletter-form {
  display: flex;
  gap: 0.5rem;
  margin-top: 1rem;
}

.newsletter-form input {
  flex: 1;
  padding: 0.75rem;
  border: none;
  border-radius: var(--radius-md);
  outline: none;
}

.newsletter-form button {
  padding: 0.75rem 1rem;
  background-color: var(--secondary-blue);
  color: var(--white);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
}

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.9rem;
}

/* Utility Classes */
.text-green { color: var(--primary-green); }
.text-blue { color: var(--primary-blue); }
.bg-light { background-color: var(--white); }
.section-padding { padding: 5rem 0; }

/* Form Controls */
.form-group {
  margin-bottom: 1.5rem;
}

.form-label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  color: var(--text-dark);
}

.form-control {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-family: var(--font-family);
  font-size: 1rem;
  outline: none;
  transition: border-color 0.3s ease;
}

.form-control:focus {
  border-color: var(--secondary-blue);
  box-shadow: 0 0 0 3px rgba(26, 95, 161, 0.1); /* focus ring */
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.fade-in {
  animation: fadeIn 0.8s ease forwards;
}

/* Responsive */
@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--white);
    flex-direction: column;
    padding: 2rem;
    box-shadow: var(--shadow-md);
    text-align: center;
  }
  
  .nav-links.active {
    display: flex;
  }
  
  .hamburger {
    display: block;
  }
  
  h1 { font-size: 2.5rem; }
  h2 { font-size: 2rem; }
}