/* Global Styles */
:root {
  --color-primary: #1a365d;
  --color-secondary: #2b6cb0;
  --color-success: #38a169;
  --color-danger: #e53e3e;
  --color-warning: #d69e2e;
  --color-text: #2d3748;
  --color-text-light: #718096;
  --color-bg: #ffffff;
  --color-bg-alt: #f7fafc;
  --color-border: #e2e8f0;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

h1, h2, h3, h4, h5, h6 {
  line-height: 1.3;
  margin-bottom: 1rem;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }

p {
  margin-bottom: 1rem;
}

a {
  color: var(--color-secondary);
}

/* Hero Section */
.hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  color: white;
  padding: 4rem 0;
  text-align: center;
}

.hero h1 {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.hero p {
  font-size: 1.25rem;
  opacity: 0.9;
  max-width: 600px;
  margin: 0 auto 2rem;
}

/* Cards */
.card {
  background: white;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
  padding: 1.5rem;
  margin-bottom: 1rem;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
  margin: 2rem 0;
}

/* Tables */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
}

th, td {
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

th {
  background: var(--color-bg-alt);
  font-weight: 600;
}

tr:hover {
  background: var(--color-bg-alt);
}

/* Number formatting */
.number {
  font-family: 'SF Mono', Monaco, monospace;
  text-align: right;
}

.positive {
  color: var(--color-success);
}

.negative {
  color: var(--color-danger);
}

/* Section */
.section {
  padding: 3rem 0;
}

.section-title {
  margin-bottom: 2rem;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: 6px;
  text-decoration: none;
  font-weight: 500;
  transition: all 0.2s;
}

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

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

.btn-secondary {
  background: white;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

/* Stats */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
  margin: 2rem 0;
}

.stat-card {
  background: white;
  border-radius: 8px;
  padding: 1.5rem;
  text-align: center;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.stat-value {
  font-size: 2rem;
  font-weight: bold;
  margin-bottom: 0.5rem;
}

.stat-label {
  color: var(--color-text-light);
  font-size: 0.875rem;
}

/* Mermaid diagrams */
.mermaid-container {
  background: white;
  border-radius: 8px;
  padding: 2rem;
  margin: 2rem 0;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
  overflow-x: auto;
}

/* Year Navigation */
.year-nav {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.year-nav a {
  padding: 0.5rem 1rem;
  border-radius: 6px;
  text-decoration: none;
  background: var(--color-bg-alt);
  color: var(--color-text);
  transition: all 0.2s;
}

.year-nav a:hover,
.year-nav a.active {
  background: var(--color-primary);
  color: white;
}

/* Responsive */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 2rem;
  }

  h1 { font-size: 1.75rem; }
  h2 { font-size: 1.5rem; }

  table {
    font-size: 0.875rem;
  }

  th, td {
    padding: 0.5rem;
  }
}