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

body {
  font-family: system-ui, sans-serif;
  background: #0f1117;
  color: #dde;
  min-height: 100vh;
}

nav {
  background: #1a1d26;
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  border-bottom: 1px solid #2a2d3a;
  flex-wrap: wrap;
}

nav a { color: #99aacc; text-decoration: none; font-size: 0.9rem; }
nav a:hover { color: #fff; }
nav .brand { font-weight: 700; font-size: 1.1rem; color: #fff; margin-right: 0.5rem; }

.nav-links { display: flex; gap: 1.25rem; align-items: center; }
.nav-link { color: #99aacc; }
.nav-link.active { color: #fff; font-weight: 600; }

.nav-about { font-size: 0.75rem; color: #556 !important; margin-left: auto; }
.nav-about:hover { color: #99aacc !important; }
.nav-about.active { color: #99aacc !important; font-weight: normal !important; }

main {
  max-width: 1400px;
  margin: 0 auto;
  padding: 2rem 2.5rem;
}

h1 { font-size: 1.6rem; margin-bottom: 0.25rem; }
h2 { font-size: 1.05rem; margin: 2rem 0 0.75rem; color: #aab; text-transform: uppercase; letter-spacing: 0.04em; }
.subtitle { color: #99a; font-size: 0.95rem; margin-bottom: 1.75rem; }

/* Summary cards */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 1rem;
  margin-bottom: 0.5rem;
}
.card {
  background: #1a1d26;
  border: 1px solid #2a2d3a;
  border-radius: 8px;
  padding: 1.1rem 1.25rem;
}
.card-label { font-size: 0.72rem; color: #778; text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 0.4rem; }
.card-value { font-size: 1.9rem; font-weight: 700; color: #eef; line-height: 1.1; }
.card-value-neg { color: #ee7766; }
.card-unit { font-size: 0.72rem; color: #556; margin-top: 0.3rem; }

/* Chart */
.chart-wrap {
  background: #1a1d26;
  border: 1px solid #2a2d3a;
  border-radius: 8px;
  padding: 1rem 1rem 0.5rem;
  margin-bottom: 0.5rem;
}

@media (max-width: 640px) {
  main { padding: 1.25rem 1rem; }
  h1 { font-size: 1.3rem; }
  .card-value { font-size: 1.5rem; }
}