:root {
  /* Mandatory Colors */
  --primary: #0077B6;
  --secondary: #F4A261;
  
  /* Theme Colors */
  --bg-color: #ffffff;
  --text-color: #171717;
  --text-muted: #4a4a4a;
  --accent-light: #eaf6ff;
  --border-color: #e2e8f0;
  
  /* Typography & Spacing */
  --font-main: 'Segoe UI', Roboto, -apple-system, sans-serif;
  --radius: 12px;
  --shadow-soft: 0 10px 30px rgba(0, 0, 0, 0.05);
  --shadow-medium: 0 4px 12px rgba(0, 119, 182, 0.1);
  --container-width: 1100px;
}

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

body {
  background-color: var(--bg-color);
  color: var(--text-color);
  font-family: var(--font-main);
  font-size: 1.125rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  /* Subtle tropical texture background */
  background-image: 
    radial-gradient(circle at 2px 2px, rgba(0, 119, 182, 0.02) 1px, transparent 0);
  background-size: 40px 40px;
}

h1, h2, h3, h4 {
  color: var(--primary);
  line-height: 1.2;
  margin-bottom: 1.5rem;
  font-weight: 700;
}

h1 { font-size: 2.5rem; letter-spacing: -0.02em; }
h2 { font-size: 2rem; border-bottom: 3px solid var(--secondary); display: inline-block; padding-bottom: 8px; margin-top: 2rem; }

p {
  margin-bottom: 1.25rem;
  max-width: 70ch;
}

/* Navigation */
header {
  background: white;
  padding: 1.5rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: 0 2px 15px rgba(0,0,0,0.03);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.logo {
  font-weight: 800;
  color: var(--primary);
  font-size: 1.5rem;
  text-decoration: none;
}

nav a {
  text-decoration: none;
  color: var(--text-color);
  margin-left: 2rem;
  font-weight: 600;
  transition: color 0.3s ease;
}

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

/* Layout Elements */
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 4rem 2rem;
}

.hero {
  background: linear-gradient(rgba(255,255,255,0.8), rgba(255,255,255,0.8)), url('https://images.unsplash.com/photo-1544735745-b81216c0245b?auto=format&fit=crop&q=80&w=1200');
  background-size: cover;
  background-position: center;
  padding: 6rem 2rem;
  text-align: center;
  border-radius: 0 0 var(--radius) var(--radius);
}

/* Cards & Sections */
.card {
  background: #ffffff;
  padding: 2rem;
  border-radius: var(--radius);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-soft);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  height: 100%;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
  border-color: var(--secondary);
}

/* Buttons & Interactive */
.btn {
  display: inline-block;
  padding: 0.8rem 2rem;
  border-radius: 50px;
  font-weight: 700;
  text-decoration: none;
  transition: all 0.3s ease;
  cursor: pointer;
  border: none;
  font-size: 1rem;
}

.btn-primary {
  background-color: var(--primary);
  color: #ffffff;
  box-shadow: var(--shadow-medium);
}

.btn-primary:hover {
  background-color: #005f92;
  box-shadow: 0 6px 20px rgba(0, 119, 182, 0.3);
}

.btn-secondary {
  background-color: var(--secondary);
  color: #ffffff;
}

.btn-secondary:hover {
  filter: brightness(1.1);
}

/* Accents & UI Elements */
.badge {
  background-color: var(--accent-light);
  color: var(--primary);
  padding: 0.4rem 1rem;
  border-radius: 20px;
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

/* Forms */
input, select, textarea {
  width: 100%;
  padding: 1rem;
  border: 2px solid var(--border-color);
  border-radius: var(--radius);
  font-family: inherit;
  font-size: 1rem;
  margin-top: 0.5rem;
  margin-bottom: 1.5rem;
}

input:focus {
  outline: none;
  border-color: var(--primary);
}

/* Footer */
footer {
  background-color: #f8fafc;
  padding: 4rem 2rem;
  border-top: 1px solid var(--border-color);
  margin-top: 4rem;
}

.footer-content {
  max-width: var(--container-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 3rem;
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
    animation: none !important;
  }
}

a:focus {
  outline: 3px solid var(--secondary);
  outline-offset: 4px;
}

/* Senior-friendly sizing */
@media (max-width: 768px) {
  body { font-size: 1.25rem; }
  h1 { font-size: 2rem; }
  .container { padding: 2rem 1rem; }
}