:root {
  --primary: #047857;
  --secondary: #0D9488;
  --accent: #3B82F6;
  --surface: #FFFFFF;
  --foreground: #0F172A;
  --muted: #94A3B8;
  --danger: #DC2626;
  --success: #15803D;
  --heading-font: "Inter", system-ui, sans-serif;
  --body-font: "Inter", system-ui, sans-serif;
  --mono-font: "JetBrains Mono", monospace;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--body-font);
  color: var(--foreground);
  background: var(--surface);
  line-height: 1.55;
}
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3, h4 { font-family: var(--heading-font); color: var(--foreground); margin: 0 0 0.5em; }

.container { max-width: 1100px; margin: 0 auto; padding: 0 1.5rem; }

.site-header {
  background: var(--primary);
  color: var(--surface);
  padding: 1.25rem 0;
}
.site-header .container { display: flex; align-items: center; justify-content: space-between; }
.brand { font-family: var(--heading-font); font-weight: 700; font-size: 1.35rem; letter-spacing: 0.5px; color: var(--surface); }
.brand img { height: 36px; vertical-align: middle; margin-right: 0.5rem; }
.nav { display: flex; gap: 1.25rem; }
.nav a { color: var(--surface); font-weight: 600; }
.nav a:hover { color: var(--accent); text-decoration: none; }
.nav .cta {
  background: var(--accent);
  color: var(--foreground);
  padding: 0.45rem 0.9rem;
  border-radius: 6px;
}

.hero {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: var(--surface);
  padding: 4.5rem 0;
}
.hero h1 { color: var(--surface); font-size: 2.4rem; margin-bottom: 0.5rem; }
.hero p { font-size: 1.15rem; max-width: 680px; opacity: 0.92; }
.hero .cta-row { margin-top: 1.5rem; display: flex; gap: 0.75rem; }
.btn-primary {
  background: var(--accent);
  color: var(--foreground);
  padding: 0.7rem 1.4rem;
  border-radius: 8px;
  font-weight: 700;
  display: inline-block;
}
.btn-secondary {
  background: transparent;
  color: var(--surface);
  border: 2px solid var(--surface);
  padding: 0.6rem 1.3rem;
  border-radius: 8px;
  font-weight: 600;
  display: inline-block;
}

.section { padding: 3rem 0; }
.section-title { font-size: 1.75rem; margin-bottom: 1.5rem; color: var(--foreground); }

.competition-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.25rem;
}
.competition-card {
  background: var(--surface);
  border: 1px solid var(--muted);
  border-radius: 10px;
  padding: 1.25rem;
  transition: transform 0.15s, box-shadow 0.15s;
}
.competition-card:hover { transform: translateY(-2px); box-shadow: 0 8px 18px rgba(0,0,0,0.06); }
.competition-card .status {
  display: inline-block;
  font-size: 0.78rem;
  text-transform: uppercase;
  font-weight: 700;
  background: var(--accent);
  color: var(--foreground);
  padding: 0.15rem 0.55rem;
  border-radius: 4px;
  margin-bottom: 0.6rem;
}
.competition-card h3 { font-size: 1.15rem; margin-bottom: 0.4rem; }
.competition-card p { color: var(--muted); font-size: 0.92rem; }

.leaderboard-table { width: 100%; border-collapse: collapse; margin-top: 1rem; }
.leaderboard-table th, .leaderboard-table td { padding: 0.65rem 0.9rem; text-align: left; border-bottom: 1px solid var(--muted); }
.leaderboard-table th { font-family: var(--heading-font); font-weight: 700; background: var(--surface); }
.leaderboard-table tr:nth-child(even) td { background: rgba(0,0,0,0.02); }

.empty-state {
  background: var(--surface);
  border: 1px dashed var(--muted);
  padding: 2rem;
  text-align: center;
  border-radius: 10px;
  color: var(--muted);
}

.site-footer {
  background: var(--secondary);
  color: var(--surface);
  padding: 2rem 0;
  margin-top: 3rem;
  font-size: 0.9rem;
}
.site-footer a { color: var(--accent); }
.site-footer .footer-cols { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 1.5rem; }
.site-footer h4 { color: var(--surface); margin-bottom: 0.6rem; font-size: 1rem; }

.tc-build-tag {
  position: fixed;
  bottom: 8px;
  left: 12px;
  font-size: 10px;
  color: #9ca3af;
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  user-select: none;
  pointer-events: none;
  z-index: 5;
  opacity: 0.7;
  letter-spacing: 0.02em;
}
@media print { .tc-build-tag { display: none; } }
@media (max-width: 600px) {
  .tc-build-tag { font-size: 9px; bottom: 4px; left: 6px; opacity: 0.5; }
}