:root {
  --bg: #f8f9fa;
  --text: #212529;
  --primary: #0d6efd;
  --success: #198754;
  --warning: #ffc107;
  --danger: #dc3545;
  --border: #dee2e6;
  --card-bg: #fff;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  background: var(--card-bg);
  border-bottom: 1px solid var(--border);
  padding: 1rem 2rem;
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
}

nav .logo {
  font-weight: bold;
  font-size: 1.25rem;
  color: var(--primary);
  text-decoration: none;
}

nav ul {
  display: flex;
  list-style: none;
  gap: 1.5rem;
}

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

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

main {
  flex: 1;
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
  width: 100%;
}

h1, h2, h3 {
  margin-bottom: 1rem;
}

h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; margin-top: 2rem; }
h3 { font-size: 1.25rem; }

p { margin-bottom: 1rem; }

.summary-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.5rem;
}

.card h3 {
  font-size: 0.875rem;
  color: #6c757d;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}

.card .value {
  font-size: 1.5rem;
  font-weight: bold;
}

.card .value.success { color: var(--success); }
.card .value.warning { color: var(--warning); }
.card .value.danger { color: var(--danger); }

table {
  width: 100%;
  border-collapse: collapse;
  background: var(--card-bg);
  border-radius: 8px;
  overflow: hidden;
  margin-bottom: 2rem;
}

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

th {
  background: #f1f3f5;
  font-weight: 600;
}

tr:last-child td {
  border-bottom: none;
}

tr:hover {
  background: #f8f9fa;
}

.rate-high { color: var(--success); font-weight: bold; }
.rate-medium { color: var(--warning); font-weight: bold; }
.rate-low { color: var(--danger); font-weight: bold; }

.bg-high { background-color: #d1e7dd !important; }
.bg-medium { background-color: #fff3cd !important; }
.bg-low { background-color: #f8d7da !important; }

.matrix-table {
  font-size: 0.875rem;
}

.matrix-table th,
.matrix-table td {
  text-align: center;
  padding: 0.5rem;
}

.matrix-table .encoder-name {
  text-align: left;
  font-weight: 600;
}

.winner {
  background: linear-gradient(135deg, #d4edda 0%, #c3e6cb 100%);
  border: 2px solid var(--success);
}

.winner h3::before {
  content: "🏆 ";
}

footer {
  background: var(--card-bg);
  border-top: 1px solid var(--border);
  padding: 1rem 2rem;
  text-align: center;
  font-size: 0.875rem;
  color: #6c757d;
}

footer a {
  color: var(--primary);
}

@media (max-width: 768px) {
  nav {
    flex-direction: column;
    gap: 1rem;
  }

  nav ul {
    flex-wrap: wrap;
    justify-content: center;
  }

  main {
    padding: 1rem;
  }

  .summary-cards {
    grid-template-columns: 1fr;
  }
}