@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

:root {
  /* Colors */
  --primary: #0284c7; /* Sky 600 */
  --primary-dark: #0369a1; /* Sky 700 */
  --primary-light: #e0f2fe; /* Sky 100 */
  
  --secondary: #10b981; /* Emerald 500 */
  --secondary-dark: #047857; /* Emerald 700 */
  --secondary-light: #d1fae5; /* Emerald 100 */
  
  --accent: #f43f5e; /* Rose 500 */
  
  --bg-body: #f8fafc; /* Slate 50 */
  --bg-surface: #ffffff;
  
  --text-main: #0f172a; /* Slate 900 */
  --text-muted: #64748b; /* Slate 500 */
  --text-light: #94a3b8; /* Slate 400 */
  
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);

  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', sans-serif;
  background-color: var(--bg-body);
  color: var(--text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img {
  max-width: 100%;
  display: block;
}

a {
  text-decoration: none;
  color: inherit;
}

ul {
  list-style: none;
}

/* Layout Utilities */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section {
  padding: 5rem 0;
}

.text-center { text-align: center; }
.text-primary { color: var(--primary); }
.text-secondary { color: var(--secondary); }

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.25;
  color: var(--text-main);
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); letter-spacing: -0.02em; }
h2 { font-size: clamp(2rem, 4vw, 3rem); letter-spacing: -0.02em; margin-bottom: 3rem; }
h3 { font-size: 1.5rem; margin-bottom: 1rem; }
p { margin-bottom: 1.5rem; color: var(--text-muted); font-size: 1.125rem; }

/* Header & Nav */
header {
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(0,0,0,0.05);
  transition: var(--transition);
}

header.scrolled {
  box-shadow: var(--shadow-sm);
  background: rgba(255, 255, 255, 0.95);
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 80px;
}

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

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

.nav-links {
  display: flex;
  gap: 2.5rem;
}

.nav-link {
  font-weight: 600;
  color: var(--text-main);
  transition: var(--transition);
}

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

.cta-button {
  background: var(--primary);
  color: white;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-full);
  font-weight: 600;
  transition: var(--transition);
}

.cta-button:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(2, 132, 199, 0.25);
}

/* Mobile Menu */
.hamburger {
  display: none;
  cursor: pointer;
  z-index: 1001;
}

.bar {
  display: block;
  width: 25px;
  height: 3px;
  margin: 5px auto;
  transition: all 0.3s ease-in-out;
  background-color: var(--text-main);
  border-radius: 99px;
}

/* Hero Section */
.hero {
  padding-top: 140px;
  padding-bottom: 100px;
  background: radial-gradient(circle at top right, var(--primary-light), transparent 40%),
              radial-gradient(circle at bottom left, var(--secondary-light), transparent 40%);
  position: relative;
  overflow: hidden;
}

.hero-content {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
  position: relative;
  z-index: 10;
}

.badge {
  display: inline-block;
  background: white;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--primary);
  box-shadow: var(--shadow-sm);
  margin-bottom: 1.5rem;
  border: 1px solid var(--primary-light);
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  margin-top: 2rem;
}

.btn-secondary {
  background: white;
  color: var(--text-main);
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-full);
  font-weight: 600;
  border: 1px solid #e2e8f0;
  transition: var(--transition);
}

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

/* Symptoms Section */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
}

.card {
  background: var(--bg-surface);
  border-radius: var(--radius-xl);
  padding: 2rem;
  box-shadow: var(--shadow-md);
  transition: var(--transition);
  border: 1px solid rgba(0,0,0,0.02);
  position: relative;
  overflow: hidden;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-xl);
}

.card-icon {
  width: 50px;
  height: 50px;
  background: var(--primary-light);
  color: var(--primary);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 1.5rem;
}

.card.prevention .card-icon {
  background: var(--secondary-light);
  color: var(--secondary-dark);
}

/* Info Banner */
.info-banner {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: white;
  border-radius: var(--radius-xl);
  padding: 4rem 2rem;
  margin-top: 4rem;
  position: relative;
  overflow: hidden;
}

.info-banner h2, .info-banner p { color: white; }
.info-banner p { opacity: 0.9; }

/* News Section */
.news-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.news-card {
  background: white;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.news-card:hover { box-shadow: var(--shadow-xl); transform: translateY(-2px); }

.news-image {
  height: 200px;
  background: #cbd5e1; /* Placeholder color */
  position: relative;
}

.news-content { padding: 1.5rem; flex: 1; display: flex; flex-direction: column; }
.news-date { font-size: 0.875rem; color: var(--text-light); margin-bottom: 0.5rem; }
.news-title { font-size: 1.25rem; font-weight: 700; margin-bottom: 1rem; line-height: 1.4; color: var(--text-main); }
.news-excerpt { flex: 1; font-size: 1rem; }
.read-more { color: var(--primary); font-weight: 600; margin-top: 1.5rem; display: inline-flex; align-items: center; gap: 0.25rem; }
.read-more:hover { gap: 0.5rem; }

/* FAQ Section */
.accordion {
  max-width: 800px;
  margin: 0 auto;
}

.accordion-item {
  background: white;
  border-radius: var(--radius-lg);
  margin-bottom: 1rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid #f1f5f9;
}

.accordion-header {
  padding: 1.5rem;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
  font-size: 1.125rem;
  transition: var(--transition);
}

.accordion-header:hover { color: var(--primary); }

.accordion-icon {
  transition: transform 0.3s ease;
}

.accordion-item.active .accordion-icon { transform: rotate(180deg); }

.accordion-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease-out;
}

.accordion-body {
  padding: 0 1.5rem 1.5rem 1.5rem;
  color: var(--text-muted);
}

/* Footer */
footer {
  background: #f1f5f9;
  padding: 4rem 0 2rem;
  margin-top: 5rem;
  border-top: 1px solid #e2e8f0;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-col h4 { margin-bottom: 1.5rem; font-size: 1.125rem; }
.footer-col ul li { margin-bottom: 0.75rem; }
.footer-col a { color: var(--text-muted); transition: var(--transition); }
.footer-col a:hover { color: var(--primary); }

.copyright {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid #e2e8f0;
  color: var(--text-light);
  font-size: 0.875rem;
}

/* Mobile Responsive */
@media (max-width: 768px) {
  .hamburger { display: block; }
  .nav-links {
    position: fixed;
    top: 80px;
    left: -100%;
    width: 100%;
    background: white;
    flex-direction: column;
    padding: 2rem;
    gap: 1.5rem;
    box-shadow: var(--shadow-md);
    transition: 0.3s ease-in-out;
    height: calc(100vh - 80px);
  }
  .nav-links.active {
    left: 0;
  }
  h1 { font-size: 2.5rem; }
}