:root {
  --primary: #0a2540;
  --accent: #00b4d8;
  --accent-dark: #0096b7;
  --light: #f8f9fa;
  --white: #ffffff;
  --text: #333333;
  --text-light: #6b7280;
  --gold: #c9a84c;
  --gradient: linear-gradient(135deg, #0a2540 0%, #0d3b66 100%);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}

h1, h2, h3, h4 { font-family: 'Inter', sans-serif; font-weight: 700; line-height: 1.2; }
h1 { font-size: clamp(2.2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.8rem, 4vw, 2.5rem); margin-bottom: 1rem; }
h3 { font-size: 1.3rem; margin-bottom: 0.5rem; }
p { margin-bottom: 1rem; }

.section-subtitle {
  color: var(--accent);
  text-transform: uppercase;
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: 2px;
  margin-bottom: 0.5rem;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

section { padding: 5rem 0; }

nav {
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(10, 37, 64, 0.95);
  backdrop-filter: blur(10px);
  padding: 1rem 0;
  transition: all 0.3s ease;
}

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

.logo {
  color: var(--white);
  font-size: 1.4rem;
  font-weight: 700;
  text-decoration: none;
  letter-spacing: 0.5px;
}

.logo span { color: var(--accent); }

.nav-links {
  display: flex;
  list-style: none;
  gap: 2rem;
  align-items: center;
}

.nav-links a {
  color: rgba(255,255,255,0.85);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.3s;
}

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

.nav-cta {
  background: var(--accent) !important;
  color: var(--white) !important;
  padding: 0.6rem 1.5rem;
  border-radius: 6px;
  font-weight: 600 !important;
  transition: background 0.3s !important;
}

.nav-cta:hover { background: var(--accent-dark) !important; }

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--white);
  font-size: 1.5rem;
  cursor: pointer;
}

.hero {
  background: var(--gradient);
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding-top: 80px;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(0,180,216,0.1) 0%, transparent 70%);
  border-radius: 50%;
}

.hero-content { max-width: 700px; position: relative; z-index: 2; }

.hero h1 { color: var(--white); margin-bottom: 1.5rem; }
.hero h1 span { color: var(--accent); }

.hero p {
  color: rgba(255,255,255,0.8);
  font-size: 1.15rem;
  margin-bottom: 2rem;
  max-width: 550px;
}

.hero-stats {
  display: flex;
  gap: 3rem;
  margin-top: 3rem;
}

.hero-stat h3 {
  color: var(--accent);
  font-size: 2rem;
  margin-bottom: 0.2rem;
}

.hero-stat p {
  color: rgba(255,255,255,0.6);
  font-size: 0.85rem;
  margin: 0;
}

.btn-primary {
  display: inline-block;
  background: var(--accent);
  color: var(--white);
  padding: 0.9rem 2.2rem;
  border-radius: 6px;
  text-decoration: none;
  font-weight: 600;
  font-size: 1rem;
  transition: all 0.3s;
  border: none;
  cursor: pointer;
}

.btn-primary:hover {
  background: var(--accent-dark);
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(0,180,216,0.3);
}

.btn-secondary {
  display: inline-block;
  border: 2px solid rgba(255,255,255,0.3);
  color: var(--white);
  padding: 0.85rem 2.2rem;
  border-radius: 6px;
  text-decoration: none;
  font-weight: 600;
  font-size: 1rem;
  transition: all 0.3s;
  margin-left: 1rem;
}

.btn-secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.problem { background: var(--white); }

.problem-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin-top: 3rem;
}

.problem-card {
  background: var(--light);
  padding: 2rem;
  border-radius: 12px;
  border-left: 4px solid #e5e7eb;
  transition: all 0.3s;
}

.problem-card.highlight {
  border-left-color: var(--accent);
  background: linear-gradient(135deg, #f0fafe 0%, #ffffff 100%);
  box-shadow: 0 4px 20px rgba(0,180,216,0.1);
}

.problem-card h3 { color: var(--primary); }
.problem-card .tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  padding: 0.3rem 0.8rem;
  border-radius: 20px;
  margin-bottom: 1rem;
}

.tag-plant { background: #dcfce7; color: #166534; }
.tag-marine { background: #fef3c7; color: #92400e; }
.tag-human { background: #dbeafe; color: #1e40af; }

.science { background: var(--light); }

.science-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
  margin-top: 3rem;
}

.science-points { list-style: none; }

.science-points li {
  padding: 1rem 0;
  padding-left: 2rem;
  position: relative;
  border-bottom: 1px solid #e5e7eb;
}

.science-points li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 700;
  font-size: 1.1rem;
}

.science-highlight {
  background: var(--gradient);
  border-radius: 16px;
  padding: 3rem;
  color: var(--white);
}

.science-highlight h3 {
  color: var(--accent);
  font-size: 3.5rem;
  margin-bottom: 0.5rem;
}

.science-highlight p { color: rgba(255,255,255,0.8); margin: 0; }

.applications { background: var(--white); }

.app-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin-top: 3rem;
}

.app-card {
  padding: 2.5rem 2rem;
  border-radius: 12px;
  background: var(--white);
  border: 1px solid #e5e7eb;
  transition: all 0.3s;
  text-align: center;
}

.app-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 30px rgba(0,0,0,0.08);
  border-color: var(--accent);
}

.app-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

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

.research h2 { color: var(--white); }
.research .section-subtitle { color: var(--accent); }

.study-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  margin-top: 3rem;
}

.study-card {
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 12px;
  padding: 2rem;
  transition: all 0.3s;
}

.study-card:hover {
  background: rgba(255,255,255,0.08);
  border-color: var(--accent);
}

.study-tag {
  display: inline-block;
  background: rgba(0,180,216,0.15);
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  margin-bottom: 0.75rem;
}

.study-card h4 {
  color: var(--white);
  font-size: 1rem;
  margin-bottom: 0.5rem;
  line-height: 1.4;
}

.study-card p {
  color: rgba(255,255,255,0.6);
  font-size: 0.85rem;
  margin-bottom: 0.75rem;
}

.study-link {
  color: var(--accent);
  font-size: 0.85rem;
  text-decoration: none;
  font-weight: 600;
}

.study-link:hover { text-decoration: underline; }

.research-note {
  text-align: center;
  margin-top: 3rem;
  color: rgba(255,255,255,0.5);
  font-size: 0.9rem;
}

.about { background: var(--light); }

.about-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin-top: 3rem;
}

.about-card {
  background: var(--white);
  padding: 2.5rem;
  border-radius: 12px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.04);
  text-align: center;
}

.about-card .icon {
  font-size: 2rem;
  margin-bottom: 1rem;
}

.cta-section {
  background: var(--gradient);
  text-align: center;
  padding: 5rem 0;
}

.cta-section h2 { color: var(--white); margin-bottom: 1rem; }
.cta-section p { color: rgba(255,255,255,0.7); max-width: 600px; margin: 0 auto 2rem; }

.contact-form {
  max-width: 500px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.contact-form input,
.contact-form select,
.contact-form textarea {
  padding: 0.9rem 1.2rem;
  border-radius: 8px;
  border: 1px solid rgba(255,255,255,0.2);
  background: rgba(255,255,255,0.1);
  color: var(--white);
  font-size: 0.95rem;
  font-family: inherit;
  backdrop-filter: blur(5px);
}

.contact-form input::placeholder,
.contact-form textarea::placeholder {
  color: rgba(255,255,255,0.5);
}

.contact-form select option { color: var(--text); background: var(--white); }

.contact-form textarea { min-height: 100px; resize: vertical; }

.contact-form button {
  background: var(--accent);
  color: var(--white);
  padding: 1rem;
  border-radius: 8px;
  border: none;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s;
}

.contact-form button:hover { background: var(--accent-dark); }

footer {
  background: #061325;
  color: rgba(255,255,255,0.5);
  padding: 3rem 0;
  text-align: center;
  font-size: 0.85rem;
}

footer a { color: var(--accent); text-decoration: none; }

.disclaimer {
  max-width: 800px;
  margin: 1.5rem auto 0;
  font-size: 0.75rem;
  color: rgba(255,255,255,0.3);
  line-height: 1.5;
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .mobile-toggle { display: block; }
  .nav-links.active {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--primary);
    padding: 2rem;
    gap: 1rem;
  }
  .hero-stats { flex-direction: column; gap: 1.5rem; }
  .problem-grid,
  .app-grid,
  .study-grid,
  .about-grid,
  .science-content { grid-template-columns: 1fr; }
  .btn-secondary { margin-left: 0; margin-top: 1rem; display: inline-block; }
  section { padding: 3rem 0; }
}