:root {
  --primary: #1f4f7b;
  --primary-light: #e3f0ff;
  --accent: #f4a623;
  --danger: #c0392b;
  --bg: #f7f9fb;
  --border: #d0d7e2;
  --text: #1f2933;
  --muted: #6b7280;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

header {
  padding: 1rem 1.5rem;
  background: white;
  border-bottom: 1px solid var(--border);
}

header h1 {
  margin: 0;
  font-size: 1.2rem;
  font-weight: 600;
}

header span {
  font-size: 0.85rem;
  color: var(--muted);
}

main {
  flex: 1;
  padding: 1rem 1.5rem 4.5rem;
  max-width: 1100px;
  width: 100%;
  margin: 0 auto;
}

.tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.tab-btn {
  padding: 0.5rem 0.9rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: white;
  font-size: 0.85rem;
  cursor