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

:root {
  --color-ocean: #0891b2;
  --color-ocean-dark: #0e7490;
  --color-ocean-light: #06b6d4;
  --color-sand: #fef3c7;
  --color-sand-dark: #fde68a;
  --color-green: #059669;
  --color-green-dark: #047857;
  --color-text: #1f2937;
  --color-text-light: #6b7280;
  --color-bg: #ffffff;
  --color-bg-alt: #f9fafb;
  --spacing-unit: 8px;
}

body {
  margin: 0;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.6;
}

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  z-index: 1000;
}

.nav {
  padding: calc(var(--spacing-unit) * 2) 0;
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 calc(var(--spacing-unit) * 3);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-ocean);
  text-decoration: none;
  transition: color 0.3s ease;
}

.logo:hover {
  color: var(--color-ocean-dark);
}

.nav-links {
  display: flex;
  gap: calc(var(--spacing-unit) * 4);
  align-items: center;
}

.nav-links a {
  text-decoration: none;
  color: var(--color-text);
  font-weight: 500;
  transition: color 0.3s ease;
  font-size: 0.95rem;
}

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

.btn-donate {
  background: var(--color-ocean);
  color: white !important;
  padding: calc(var(--spacing-unit) * 1.5) calc(var(--spacing-unit) * 3);
  border-radius: calc(var(--spacing-unit) * 1);
  transition: all 0.3s ease;
}

.btn-donate:hover {
  background: var(--color-ocean-dark);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(8, 145, 178, 0.3);
}

main {
  margin-top: 72px;
}

.hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: calc(var(--spacing-unit) * 6);
  max-width: 1200px;
  margin: 0 auto;
  padding: calc(var(--spacing-unit) * 12) calc(var(--spacing-unit) * 3);
  align-items: center;
}

.hero-content {
  max-width: 540px;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: calc(var(--spacing-unit) * 3);
  color: var(--color-text);
}

.hero-subtitle {
  font-size: 1.25rem;
  line-height: 1.5;
  color: var(--color-text-light);
  margin-bottom: calc(var(--spacing-unit) * 4);
}

.hero-actions {
  display: flex;
  gap: calc(var(--spacing-unit) * 2);
}

.btn {
  padding: calc(var(--spacing-unit) * 2) calc(var(--spacing-unit) * 4);
  border-radius: calc(var(--spacing-unit) * 1);
  text-decoration: none;
  font-weight: 600;
  font-size: 1rem;
  transition: all 0.3s ease;
  display: inline-block;
  border: none;
  cursor: pointer;
}

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

.btn-primary:hover {
  background: var(--color-ocean-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(8, 145, 178, 0.3);
}

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

.btn-secondary:hover {
  background: var(--color-ocean);
  color: white;
  transform: translateY(-2px);
}

.hero-image {
  border-radius: calc(var(--spacing-unit) * 2);
  overflow: hidden;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

.hero-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 calc(var(--spacing-unit) * 3);
}

.section-title {
  font-size: 2.5rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: calc(var(--spacing-unit) * 2);
  color: var(--color-text);
}

.section-description {
  font-size: 1.125rem;
  text-align: center;
  color: var(--color-text-light);
  max-width: 800px;
  margin: 0 auto calc(var(--spacing-unit) * 6);
  line-height: 1.7;
}

.mission {
  padding: calc(var(--spacing-unit) * 12) 0;
  background: var(--color-bg-alt);
}

.mission-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: calc(var(--spacing-unit) * 4);
  margin-top: calc(var(--spacing-unit) * 6);
}

.mission-card {
  background: white;
  padding: calc(var(--spacing-unit) * 4);
  border-radius: calc(var(--spacing-unit) * 2);
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  transition: all 0.3s ease;
}

.mission-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.1);
}

.mission-icon {
  width: 64px;
  height: 64px;
  background: var(--color-sand);
  border-radius: calc(var(--spacing-unit) * 2);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: calc(var(--spacing-unit) * 3);
  color: var(--color-ocean);
}

.mission-icon svg {
  width: 32px;
  height: 32px;
}

.mission-card h3 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: calc(var(--spacing-unit) * 2);
  color: var(--color-text);
}

.mission-card p {
  color: var(--color-text-light);
  line-height: 1.6;
}

.impact {
  padding: calc(var(--spacing-unit) * 12) 0;
  background: linear-gradient(135deg, var(--color-ocean) 0%, var(--color-ocean-light) 100%);
  color: white;
}

.impact .section-title {
  color: white;
}

.impact-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: calc(var(--spacing-unit) * 4);
  margin-top: calc(var(--spacing-unit) * 6);
}

.stat {
  text-align: center;
  padding: calc(var(--spacing-unit) * 3);
}

.stat-number {
  font-size: 3rem;
  font-weight: 700;
  margin-bottom: calc(var(--spacing-unit) * 1);
}

.stat-label {
  font-size: 1.125rem;
  opacity: 0.9;
}

.how-it-works {
  padding: calc(var(--spacing-unit) * 12) 0;
}

.steps {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr auto 1fr;
  gap: calc(var(--spacing-unit) * 3);
  align-items: center;
  margin-top: calc(var(--spacing-unit) * 6);
}

.step {
  text-align: center;
  padding: calc(var(--spacing-unit) * 3);
}

.step-number {
  width: 64px;
  height: 64px;
  background: var(--color-ocean);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 700;
  margin: 0 auto calc(var(--spacing-unit) * 3);
}

.step h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: calc(var(--spacing-unit) * 2);
  color: var(--color-text);
}

.step p {
  color: var(--color-text-light);
  line-height: 1.6;
}

.step-connector {
  width: 60px;
  height: 2px;
  background: var(--color-sand-dark);
}

.locations {
  padding: calc(var(--spacing-unit) * 12) 0;
  background: var(--color-bg-alt);
}

.location-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: calc(var(--spacing-unit) * 3);
  margin-top: calc(var(--spacing-unit) * 6);
}

.location-card {
  background: white;
  border-radius: calc(var(--spacing-unit) * 2);
  overflow: hidden;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  transition: all 0.3s ease;
}

.location-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.1);
}

.location-card img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  display: block;
}

.location-card h3 {
  padding: calc(var(--spacing-unit) * 3);
  font-size: 1.25rem;
  font-weight: 600;
  text-align: center;
  color: var(--color-text);
}

.donate {
  padding: calc(var(--spacing-unit) * 12) 0;
  background: linear-gradient(135deg, var(--color-green) 0%, var(--color-green-dark) 100%);
}

.donate-content {
  max-width: 700px;
  margin: 0 auto;
  text-align: center;
  color: white;
}

.donate-content h2 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: calc(var(--spacing-unit) * 3);
}

.donate-content > p {
  font-size: 1.125rem;
  line-height: 1.7;
  opacity: 0.95;
  margin-bottom: calc(var(--spacing-unit) * 4);
}

.donate-options {
  display: flex;
  gap: calc(var(--spacing-unit) * 2);
  justify-content: center;
  margin-bottom: calc(var(--spacing-unit) * 4);
  flex-wrap: wrap;
}

.amount-btn {
  padding: calc(var(--spacing-unit) * 2) calc(var(--spacing-unit) * 4);
  background: rgba(255, 255, 255, 0.2);
  border: 2px solid white;
  color: white;
  border-radius: calc(var(--spacing-unit) * 1);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
}

.amount-btn:hover,
.amount-btn.active {
  background: white;
  color: var(--color-green);
}

.btn-large {
  padding: calc(var(--spacing-unit) * 2.5) calc(var(--spacing-unit) * 6);
  font-size: 1.125rem;
  background: white;
  color: var(--color-green);
}

.btn-large:hover {
  background: var(--color-sand);
  color: var(--color-green-dark);
}

.donate-note {
  margin-top: calc(var(--spacing-unit) * 3);
  font-size: 0.875rem;
  opacity: 0.9;
}

.testimonial {
  padding: calc(var(--spacing-unit) * 12) 0;
  background: var(--color-bg-alt);
}

.testimonial-quote {
  font-size: 1.5rem;
  line-height: 1.7;
  text-align: center;
  font-style: italic;
  color: var(--color-text);
  max-width: 900px;
  margin: 0 auto calc(var(--spacing-unit) * 3);
}

.testimonial-author {
  display: block;
  text-align: center;
  color: var(--color-text-light);
  font-size: 1.125rem;
  font-style: normal;
}

.footer {
  background: var(--color-text);
  color: white;
  padding: calc(var(--spacing-unit) * 8) 0 calc(var(--spacing-unit) * 4);
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: calc(var(--spacing-unit) * 6);
  margin-bottom: calc(var(--spacing-unit) * 6);
}

.footer-section h3 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: calc(var(--spacing-unit) * 2);
}

.footer-section h4 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: calc(var(--spacing-unit) * 2);
}

.footer-section p {
  color: rgba(255, 255, 255, 0.8);
  line-height: 1.7;
}

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

.footer-section li {
  margin-bottom: calc(var(--spacing-unit) * 1.5);
  color: rgba(255, 255, 255, 0.8);
}

.footer-section a {
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  transition: color 0.3s ease;
}

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

.footer-bottom {
  padding-top: calc(var(--spacing-unit) * 4);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  text-align: center;
  color: rgba(255, 255, 255, 0.6);
}

@media (max-width: 768px) {
  .nav-links {
    gap: calc(var(--spacing-unit) * 2);
  }

  .nav-links a {
    font-size: 0.875rem;
  }

  .btn-donate {
    padding: calc(var(--spacing-unit) * 1) calc(var(--spacing-unit) * 2);
  }

  .hero {
    grid-template-columns: 1fr;
    padding: calc(var(--spacing-unit) * 8) calc(var(--spacing-unit) * 3);
  }

  .hero-title {
    font-size: 2.5rem;
  }

  .hero-subtitle {
    font-size: 1.125rem;
  }

  .hero-actions {
    flex-direction: column;
  }

  .section-title {
    font-size: 2rem;
  }

  .steps {
    grid-template-columns: 1fr;
    gap: calc(var(--spacing-unit) * 4);
  }

  .step-connector {
    width: 2px;
    height: 40px;
    margin: 0 auto;
  }

  .footer-content {
    grid-template-columns: 1fr;
    gap: calc(var(--spacing-unit) * 4);
  }

  .donate-options {
    flex-direction: column;
    align-items: stretch;
  }

  .amount-btn {
    width: 100%;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 2rem;
  }

  .section-title {
    font-size: 1.75rem;
  }

  .testimonial-quote {
    font-size: 1.25rem;
  }
}