:root {
  /* Global */
  --bg-color: #f8fafc;
  --text-main: #1e293b;
  --text-muted: #64748b;
  --border-color: #e2e8f0;
  
  /* Parkinson's Theme (Warm, High Contrast) */
  --pd-primary: #ea580c; /* Orange */
  --pd-bg: #fff7ed;
  --pd-card: #ffffff;
  
  /* Eczema Theme (Cool, Calming) */
  --ez-primary: #0284c7; /* Sky Blue */
  --ez-bg: #f0f9ff;
  --ez-card: #ffffff;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.7;
}

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

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
.site-header {
  background: #ffffff;
  border-bottom: 1px solid var(--border-color);
  padding: 20px 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}
.site-header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.logo {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: var(--text-main);
}
nav a {
  margin-left: 20px;
  font-weight: 600;
  color: var(--text-muted);
  transition: color 0.2s;
}
nav a:hover { color: var(--text-main); }

/* Hero */
.hero {
  text-align: center;
  padding: 80px 0 60px;
}
.hero h1 {
  font-size: 3rem;
  font-weight: 800;
  margin-bottom: 20px;
  letter-spacing: -1px;
}
.hero p {
  font-size: 1.2rem;
  color: var(--text-muted);
  max-width: 700px;
  margin: 0 auto;
}

/* Home Grid */
.split-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px;
  margin-bottom: 80px;
}
@media (max-width: 768px) {
  .split-grid { grid-template-columns: 1fr; }
}

.hub-card {
  border-radius: 16px;
  padding: 40px 30px;
  text-align: center;
  transition: transform 0.2s, box-shadow 0.2s;
  border: 1px solid var(--border-color);
}
.hub-card:hover {
  transform: translateY(-5px);
}
.hub-card.pd-card {
  background: var(--pd-bg);
  border-color: #ffedd5;
}
.hub-card.pd-card:hover {
  box-shadow: 0 10px 30px rgba(234, 88, 12, 0.1);
}
.hub-card.pd-card h2 { color: var(--pd-primary); }

.hub-card.ez-card {
  background: var(--ez-bg);
  border-color: #e0f2fe;
}
.hub-card.ez-card:hover {
  box-shadow: 0 10px 30px rgba(2, 132, 199, 0.1);
}
.hub-card.ez-card h2 { color: var(--ez-primary); }

.hub-card h2 {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 15px;
}
.hub-card p {
  color: var(--text-muted);
  margin-bottom: 25px;
}
.btn {
  display: inline-block;
  padding: 10px 24px;
  border-radius: 8px;
  font-weight: 600;
  transition: opacity 0.2s;
}
.btn:hover { opacity: 0.9; }
.btn-pd { background: var(--pd-primary); color: #fff; }
.btn-ez { background: var(--ez-primary); color: #fff; }

/* Article Layout */
.article-page {
  padding: 60px 0;
}
.article-header {
  margin-bottom: 40px;
  text-align: center;
}
.article-header h1 {
  font-size: 3rem;
  font-weight: 800;
  margin-bottom: 15px;
}
.article-header p {
  font-size: 1.2rem;
  color: var(--text-muted);
}
.theme-pd .article-header h1 { color: var(--pd-primary); }
.theme-ez .article-header h1 { color: var(--ez-primary); }

.section-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 30px;
  margin-bottom: 30px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.02);
}
.theme-pd .section-card { border-left: 4px solid var(--pd-primary); }
.theme-ez .section-card { border-left: 4px solid var(--ez-primary); }

.section-card h2 {
  font-size: 1.5rem;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.section-card h3 {
  font-size: 1.1rem;
  margin-top: 20px;
  margin-bottom: 10px;
  color: var(--text-main);
}
.section-card p, .section-card ul {
  margin-bottom: 15px;
  color: var(--text-muted);
}
.section-card ul {
  padding-left: 20px;
}
.section-card li {
  margin-bottom: 8px;
}
.warning-box {
  background: #fef2f2;
  border: 1px solid #fca5a5;
  color: #991b1b;
  padding: 15px;
  border-radius: 8px;
  margin-top: 20px;
  font-size: 0.95rem;
}
.info-box {
  background: #f0fdf4;
  border: 1px solid #bbf7d0;
  color: #166534;
  padding: 15px;
  border-radius: 8px;
  margin-top: 20px;
  font-size: 0.95rem;
}

/* Footer */
.site-footer {
  text-align: center;
  padding: 40px 0;
  color: var(--text-muted);
  border-top: 1px solid var(--border-color);
  background: #ffffff;
  margin-top: 60px;
}