:root {
  /* Color Palette - Serene & Clinical Modernist */
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-accent: #e0f2fe;
  --text-main: #0f172a;
  --text-muted: #64748b;
  --brand-primary: #0ea5e9;
  --brand-secondary: #0284c7;
  --brand-soft: #f0f9ff;
  --accent-success: #10b981;
  --accent-warning: #f59e0b;
  --border-color: #e2e8f0;
  --card-shadow: 0 4px 20px -2px rgba(0, 0, 0, 0.05);
  --glass-bg: rgba(255, 255, 255, 0.8);
  
  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 48px;
  --space-2xl: 80px;
  
  /* Typography */
  --font-display: 'Instrument Serif', serif;
  --font-body: 'Plus Jakarta Sans', system-ui, sans-serif;
}

* {
  box-sizing: border-box;
  -webkit-font-smoothing: antialiased;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-body);
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.5;
  overflow-x: hidden;
}

h1, h2, h3, .display-text {
  font-family: var(--font-display);
  font-weight: 400;
  margin: 0;
}

p {
  margin: 0;
}

a {
  text-decoration: none;
  color: inherit;
  transition: all 0.2s ease;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 clamp(1rem, 5vw, 4rem);
}

/* Navigation */
.nav-bar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  padding: var(--space-md) 0;
}

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

.logo {
  font-family: var(--font-display);
  font-size: 1.5rem;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.nav-links {
  display: flex;
  gap: var(--space-lg);
  align-items: center;
}

.nav-link {
  font-weight: 500;
  font-size: 0.9rem;
  color: var(--text-muted);
}

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

.btn {
  padding: 10px 20px;
  border-radius: 99px;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: transform 0.2s ease, background 0.2s ease;
  border: none;
}

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

.btn-primary:hover {
  background: var(--brand-secondary);
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-main);
}

/* Hero Section */
.hero {
  padding: var(--space-2xl) 0;
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: var(--space-xl);
  align-items: center;
}

.hero-content h1 {
  font-size: clamp(3rem, 8vw, 5rem);
  line-height: 0.9;
  margin-bottom: var(--space-lg);
}

.hero-content p {
  font-size: 1.25rem;
  color: var(--text-muted);
  max-width: 500px;
  margin-bottom: var(--space-xl);
}

/* Sections */
section {
  margin-top: var(--space-2xl);
}

.section-header {
  text-align: center;
  max-width: 600px;
  margin: 0 auto var(--space-xl);
}

.section-header h2 {
  font-size: 3rem;
  margin-bottom: var(--space-md);
}

/* Cards & Grid */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-lg);
}

.card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 24px;
  padding: var(--space-lg);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
  transform: translateY(-8px);
  box-shadow: var(--card-shadow);
}

/* Health Dashboard Components */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
}

.stat-card {
  background: white;
  padding: var(--space-lg);
  border-radius: 20px;
  border: 1px solid var(--border-color);
}

.stat-value {
  font-size: 2rem;
  font-weight: 600;
  display: block;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.health-chart-placeholder {
  width: 100%;
  height: 200px;
  background: linear-gradient(90deg, var(--brand-soft) 0%, transparent 100%);
  border-radius: 12px;
  position: relative;
  overflow: hidden;
  margin-top: var(--space-md);
}

.health-chart-line {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 60%;
  border-top: 2px solid var(--brand-primary);
  background: linear-gradient(to top, rgba(14, 165, 233, 0.1), transparent);
  clip-path: polygon(0% 80%, 15% 40%, 30% 60%, 45% 20%, 60% 50%, 75% 10%, 90% 40%, 100% 20%, 100% 100%, 0% 100%);
}

/* Placeholders */
.placeholder-image {
  background: #f1f5f9;
  border-radius: 16px;
  width: 100%;
  aspect-ratio: 16/9;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 0.8rem;
  border: 1px dashed var(--border-color);
}

.placeholder-image.portrait {
  aspect-ratio: 3/4;
}

.placeholder-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--brand-soft);
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.reveal {
  animation: fadeIn 0.8s cubic-bezier(0.2, 0.8, 0.2, 1) forwards;
}

/* Dashboard Specific */
.dashboard-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  min-height: 100vh;
}

.sidebar {
  background: white;
  border-right: 1px solid var(--border-color);
  padding: var(--space-xl) var(--space-lg);
}

.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.sidebar-item {
  padding: 12px 16px;
  border-radius: 12px;
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text-muted);
}

.sidebar-item.active {
  background: var(--brand-soft);
  color: var(--brand-primary);
  font-weight: 600;
}

.main-content {
  padding: var(--space-xl);
  max-width: 1400px;
}

/* Footer */
footer {
  margin-top: var(--space-2xl);
  padding: var(--space-xl) 0;
  border-top: 1px solid var(--border-color);
  background: white;
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: var(--space-xl);
}

@media (max-width: 768px) {
  .hero { grid-template-columns: 1fr; text-align: center; }
  .hero-content p { margin: 0 auto var(--space-xl); }
  .dashboard-layout { grid-template-columns: 1fr; }
  .sidebar { display: none; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
}