:root {
  /* Color variables */
  --color-primary: #0e4c92;
  --color-primary-light: #1a6bbb;
  --color-secondary: #6c757d;
  --color-background: #f8f9fa;
  --color-text: #212529;
  --color-text-light: #6c757d;
  --color-white: #ffffff;
  --color-accent: #e63946;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 8rem;

  /* Font sizes */
  --font-size-small: 0.875rem;
  --font-size-base: 1rem;
  --font-size-large: 1.25rem;
  --font-size-xl: 1.5rem;
  --font-size-2xl: 2rem;
  --font-size-3xl: 2.5rem;
  --font-size-4xl: 3rem;
}

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

body {
  font-family: 'Inter', sans-serif;
  line-height: 1.5;
  color: var(--color-text);
  background-color: var(--color-white);
}

.container {
  width: 90%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-sm);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  margin-bottom: var(--spacing-sm);
  font-weight: 600;
  line-height: 1.2;
}

h1 {
  font-size: var(--font-size-3xl);
}

h2 {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--spacing-md);
  text-align: center;
}

h3 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-xs);
}

p {
  margin-bottom: var(--spacing-sm);
}

.subtitle {
  font-size: var(--font-size-large);
  color: var(--color-text-light);
  margin-bottom: var(--spacing-md);
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: 4px;
  text-decoration: none;
  font-weight: 600;
  transition: all 0.3s ease;
  cursor: pointer;
}

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

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

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

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

.btn-large {
  padding: 1rem 2rem;
  font-size: var(--font-size-large);
}

/* Header and Navigation */
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background-color: var(--color-white);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  z-index: 1000;
  padding: var(--spacing-sm) 0;
}

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

.logo {
  display: flex;
  align-items: center;
  font-weight: 600;
  color: var(--color-primary);
}

.logo-icon {
  position: relative;
  margin-right: var(--spacing-sm);
  font-size: 1.5rem;
}

.medical-cross {
  color: var(--color-accent);
  font-size: 0.8rem;
  position: absolute;
  top: -5px;
  left: -8px;
}

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

.logo-icon.small .medical-cross {
  font-size: 0.6rem;
  top: -4px;
  left: -6px;
}

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

.nav-links a {
  margin-left: var(--spacing-md);
  text-decoration: none;
  color: var(--color-text);
  font-weight: 500;
  transition: color 0.3s ease;
}

.nav-links a:hover {
  color: var(--color-primary);
}

/* Hero Section */
#hero {
  padding: calc(var(--spacing-xl) + 60px) 0 var(--spacing-xl) 0;
  background: linear-gradient(rgba(14, 76, 146, 0.8), rgba(14, 76, 146, 0.8)), url('https://images.pexels.com/photos/263402/pexels-photo-263402.jpeg?auto=compress&cs=tinysrgb&w=1260&h=750&dpr=2') no-repeat center center;
  background-size: cover;
  text-align: center;
  color: var(--color-white);
}

#hero h1 {
  margin-bottom: var(--spacing-sm);
}

#hero .subtitle {
  color: rgba(255, 255, 255, 0.9);
}

/* Mission Section */
#mission {
  padding: var(--spacing-xl) 0;
  background-color: var(--color-background);
}

.mission-content {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
  font-size: var(--font-size-large);
}

/* Services Section */
#services {
  padding: var(--spacing-xl) 0;
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
}

.service-card {
  background-color: var(--color-white);
  border-radius: 8px;
  padding: var(--spacing-md);
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  text-align: center;
  transition: transform 0.3s ease;
}

.service-card:hover {
  transform: translateY(-5px);
}

.service-icon {
  font-size: 2.5rem;
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
}

/* About Section */
#about {
  padding: var(--spacing-xl) 0;
  background-color: var(--color-background);
}

.about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
}

.about-card {
  background-color: var(--color-white);
  border-radius: 8px;
  padding: var(--spacing-md);
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

/* Donate Section */
#donate {
  padding: var(--spacing-xl) 0;
  text-align: center;
  background: linear-gradient(rgba(14, 76, 146, 0.9), rgba(14, 76, 146, 0.9)), url('https://images.pexels.com/photos/3938022/pexels-photo-3938022.jpeg?auto=compress&cs=tinysrgb&w=1260&h=750&dpr=2') no-repeat center center;
  background-size: cover;
  color: var(--color-white);
}

.cta-buttons {
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
}

/* Contact Section */
#contact {
  padding: var(--spacing-xl) 0;
  background-color: var(--color-background);
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
}

.contact-card {
  background-color: var(--color-white);
  border-radius: 8px;
  padding: var(--spacing-md);
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.contact-card i {
  font-size: 1.5rem;
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
}

/* Footer */
footer {
  background-color: var(--color-primary);
  color: var(--color-white);
  padding: var(--spacing-md) 0;
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.footer-logo {
  display: flex;
  align-items: center;
  margin-bottom: var(--spacing-sm);
  color: var(--color-white);
}

.copyright {
  font-size: var(--font-size-small);
  opacity: 0.8;
}

/* Responsive design */
@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  
  h1 {
    font-size: var(--font-size-2xl);
  }
  
  h2 {
    font-size: var(--font-size-xl);
  }
  
  .cta-buttons {
    flex-direction: column;
    gap: var(--spacing-sm);
  }
  
  #hero {
    padding-top: calc(var(--spacing-lg) + 60px);
    padding-bottom: var(--spacing-lg);
  }
  
  #mission, #services, #about, #donate, #contact {
    padding: var(--spacing-lg) 0;
  }
}

/* For very small screens */
@media (max-width: 480px) {
  .container {
    width: 95%;
  }
  
  .service-card, .about-card, .contact-card {
    padding: var(--spacing-sm);
  }
}