:root {
  --ocean-blue: #1e6b8c;
  --ocean-light: #2e8bb8;
  --ocean-dark: #14506b;
  --sand: #f4e8d8;
  --coral: #ff6b6b;
  --seafoam: #a8d5ba;
  --kelp: #3d5a3d;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: linear-gradient(135deg, #f5f7fa 0%, #e8f4f8 100%);
  min-height: 100vh;
}

.bg-ocean {
  background-color: var(--ocean-blue) !important;
}

.text-ocean {
  color: var(--ocean-blue) !important;
}

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

.btn-ocean:hover {
  background-color: var(--ocean-dark);
  border-color: var(--ocean-dark);
  color: white;
}

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

.btn-outline-ocean:hover {
  background-color: var(--ocean-blue);
  border-color: var(--ocean-blue);
  color: white;
}

.border-ocean {
  border-color: var(--ocean-blue) !important;
}

/* Water ripple animation background */
.water-ripple {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: -1;
  opacity: 0.03;
  background: 
    radial-gradient(circle at 20% 50%, var(--ocean-blue) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, var(--ocean-light) 0%, transparent 50%),
    radial-gradient(circle at 40% 20%, var(--seafoam) 0%, transparent 50%);
  animation: ripple 15s ease-in-out infinite;
}

@keyframes ripple {
  0%, 100% { 
    transform: scale(1) translateY(0); 
    opacity: 0.03;
  }
  50% { 
    transform: scale(1.1) translateY(-20px); 
    opacity: 0.05;
  }
}

/* Hero section */
.hero-section {
  background: linear-gradient(135deg, var(--ocean-blue) 0%, var(--ocean-light) 100%);
  padding: 5rem 0 !important;
  margin-bottom: 3rem;
  box-shadow: 0 4px 20px rgba(0,0,0,0.1);
}

/* Sponge cards */
.sponge-card {
  background: white;
  border: none;
  border-radius: 12px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
  transition: all 0.3s ease;
}

.sponge-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(30, 107, 140, 0.15);
}

.sponge-interactive {
  cursor: pointer;
}

.sponge-interactive:hover .sustainability-reveal {
  display: block !important;
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Daily fact callout */
.daily-fact {
  background: linear-gradient(135deg, #e8f4f8 0%, #d4eaf4 100%);
  border-left: 4px solid var(--ocean-blue);
  border-radius: 8px;
}

/* Navbar */
.navbar-brand .sponge-icon {
  font-size: 1.5rem;
  margin-right: 0.5rem;
}

/* Footer */
footer {
  margin-top: auto;
}

.social-links .badge {
  font-size: 0.9rem;
  padding: 0.5rem 1rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.social-links .badge:hover {
  background-color: var(--ocean-blue) !important;
  transform: translateY(-2px);
}

/* Responsive adjustments */
@media (max-width: 768px) {
  .hero-section {
    padding: 3rem 0 !important;
  }
  
  .display-3 {
    font-size: 2.5rem;
  }
  
  .display-4 {
    font-size: 2rem;
  }
  
  .form-select-lg {
    font-size: 1rem;
  }
}

/* Article styling */
article img {
  border-radius: 8px;
}

article blockquote {
  padding-left: 1rem;
  border-left: 3px solid var(--ocean-blue);
}

article ul, article ol {
  line-height: 1.8;
}

/* Form elements */
.form-control:focus,
.form-select:focus {
  border-color: var(--ocean-light);
  box-shadow: 0 0 0 0.2rem rgba(30, 107, 140, 0.25);
}

.form-range {
  height: 0.5rem;
}

.form-range::-webkit-slider-thumb {
  background: var(--ocean-blue);
  border: 3px solid white;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.form-range::-moz-range-thumb {
  background: var(--ocean-blue);
  border: 3px solid white;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.form-range::-webkit-slider-runnable-track {
  background: linear-gradient(to right, #c3dce8, var(--ocean-light));
  border-radius: 0.5rem;
}

.form-range::-moz-range-track {
  background: linear-gradient(to right, #c3dce8, var(--ocean-light));
  border-radius: 0.5rem;
}

/* Loading states */
button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}