:root {
  --color-primary: #1B4332;
  --color-accent: #F59E0B;
  --color-bg: #FAFAF7;
  --color-text: #1A1A1A;
  --color-muted: #6B7280;
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --font-display: Georgia, "Times New Roman", serif;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.125rem;
  color: var(--color-text);
  background: var(--color-bg);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  background: var(--color-primary);
  color: white;
}

.site-header .logo {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: bold;
  color: white;
  text-decoration: none;
}

.site-header nav {
  display: none;
  gap: var(--space-lg);
}

.site-header nav a {
  color: white;
  text-decoration: none;
  font-size: 0.95rem;
  transition: color 0.2s ease;
}

.site-header nav a:hover {
  color: var(--color-accent);
}

.site-header .btn {
  background: var(--color-accent);
  color: var(--color-primary);
}

#nav-toggle {
  display: block;
  background: none;
  border: none;
  color: white;
  font-size: 1.5rem;
  cursor: pointer;
  padding: var(--space-sm);
}

.site-header.nav-open nav {
  display: flex;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--color-primary);
  flex-direction: column;
  padding: var(--space-lg);
}

.btn {
  display: inline-block;
  min-height: 48px;
  padding: var(--space-md) var(--space-xl);
  font-size: 1rem;
  font-weight: 600;
  text-align: center;
  text-decoration: none;
  background: var(--color-accent);
  color: var(--color-primary);
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.2s ease;
  line-height: 1.5;
}

.btn:hover {
  background: #E08E00;
}

.btn-ghost {
  background: transparent;
  color: white;
  border: 2px solid white;
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.1);
}

.hero {
  min-height: 90vh;
  display: flex;
  align-items: center;
  padding: var(--space-2xl) var(--space-lg);
  background: linear-gradient(to right, var(--color-bg) 50%, transparent 50%),
              url('https://images.unsplash.com/photo-1488521787991-ed7bbaae773c?w=800&h=900&fit=crop');
  background-size: cover;
  background-position: center;
}

.hero-content {
  max-width: 600px;
}

.hero h1 {
  font-family: var(--font-display);
  font-size: 3rem;
  line-height: 1;
  margin: 0 0 var(--space-lg);
}

.hero p {
  font-size: 1.125rem;
  line-height: 1.5;
  margin: 0 0 var(--space-xl);
  color: var(--color-muted);
}

.hero-actions {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.impact-stats {
  background: var(--color-primary);
  color: white;
  padding: var(--space-2xl) var(--space-lg);
}

.impact-stats .container {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
}

.stat-card {
  text-align: center;
}

.stat-card .number {
  font-size: 3rem;
  font-weight: bold;
  display: block;
  margin-bottom: var(--space-sm);
}

.stat-card p {
  font-size: 1rem;
  margin: 0;
}

.section {
  padding: var(--space-2xl) var(--space-lg);
  max-width: 1200px;
  margin: 0 auto;
}

.section h2 {
  font-family: var(--font-display);
  font-size: 2.5rem;
  line-height: 1.2;
  margin: 0 0 var(--space-xl);
  text-align: center;
}

.how-it-works .steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
}

.step {
  text-align: center;
}

.step-number {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: var(--color-accent);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: bold;
  margin: 0 auto var(--space-md);
}

.step img {
  width: 100%;
  max-width: 400px;
  height: auto;
  border-radius: 6px;
  margin-bottom: var(--space-md);
}

.step h3 {
  font-size: 1.5rem;
  margin: 0 0 var(--space-sm);
}

.step p {
  color: var(--color-muted);
  margin: 0;
}

.testimonials {
  background: #F5F5F5;
}

.testimonials .cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
}

.testimonial-card {
  background: white;
  padding: var(--space-xl);
  border-radius: 6px;
}

.testimonial-header {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.testimonial-header img {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  object-fit: cover;
}

.testimonial-card blockquote {
  font-size: 1.125rem;
  line-height: 1.5;
  margin: 0 0 var(--space-md);
  font-style: italic;
}

.testimonial-card cite {
  display: block;
  font-style: normal;
  font-weight: 600;
}

.donation-calc {
  background: linear-gradient(135deg, #FFF4E6 0%, #FFE8CC 100%);
  text-align: center;
}

.donation-calc h2 {
  color: var(--color-primary);
}

.donation-input {
  max-width: 500px;
  margin: 0 auto var(--space-lg);
}

#donation-amount {
  width: 100%;
  height: 48px;
  cursor: pointer;
}

#donation-display {
  font-size: 3rem;
  font-weight: bold;
  color: var(--color-primary);
  display: block;
  margin-bottom: var(--space-md);
}

#impact-copy {
  font-size: 1.25rem;
  color: var(--color-text);
  display: block;
  margin-bottom: var(--space-xl);
}

.partners {
  text-align: center;
}

.partner-logos {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-lg);
  margin-top: var(--space-xl);
}

.partner-badge {
  padding: var(--space-md) var(--space-lg);
  background: #F5F5F5;
  border-radius: 999px;
  font-weight: 600;
  color: var(--color-muted);
}

.cta-banner {
  background: var(--color-primary);
  color: white;
  text-align: center;
  padding: var(--space-2xl) var(--space-lg);
}

.cta-banner h2 {
  color: white;
}

.cta-banner .actions {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  flex-wrap: wrap;
  margin-top: var(--space-xl);
}

footer {
  background: #0F2419;
  color: white;
  padding: var(--space-2xl) var(--space-lg);
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
}

.footer-col h3 {
  font-size: 1.25rem;
  margin: 0 0 var(--space-md);
}

.footer-col p,
.footer-col a {
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  display: block;
  margin-bottom: var(--space-sm);
}

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

.footer-bottom {
  text-align: center;
  margin-top: var(--space-xl);
  padding-top: var(--space-xl);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.6);
}

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.5s ease-out, transform 0.5s ease-out;
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

@media (min-width: 640px) {
  .impact-stats .container {
    grid-template-columns: repeat(3, 1fr);
  }

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

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

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

@media (min-width: 720px) {
  .site-header nav {
    display: flex;
  }

  #nav-toggle {
    display: none;
  }
}

@media (min-width: 1024px) {
  .hero {
    padding: var(--space-2xl) 10%;
  }

  .hero h1 {
    font-size: 4rem;
  }
}