/* +Runners Lab — Chrome unificado para herramientas */
:root {
  --tools-ink: #100D1A;
  --tools-ink-soft: #64748b;
  --tools-accent: #30FFAE;
  --tools-accent-light: #B4F000;
  --tools-bg: #f8fafc;
  --tools-card: #ffffff;
  --tools-border: #e2e8f0;
  --tools-font: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

* { box-sizing: border-box; }
body { margin: 0; font-family: var(--tools-font); background: var(--tools-bg); color: var(--tools-ink); }
.hidden { display: none !important; }

.tools-header {
  background: var(--tools-card);
  border-bottom: 1px solid var(--tools-border);
  padding: 0.75rem 1rem;
  position: sticky;
  top: 0;
  z-index: 100;
}
.tools-header-inner {
  max-width: 80rem;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--tools-ink);
}
.tools-header-inner:hover { color: var(--tools-accent); }
.tools-logo {
  width: 2.25rem;
  height: 2.25rem;
  flex-shrink: 0;
  color: var(--tools-accent);
}
.tools-brand {
  font-weight: 800;
  font-size: 1.125rem;
  letter-spacing: -0.02em;
}
.tools-main {
  max-width: 80rem;
  margin: 0 auto;
  padding: 1.5rem 1rem 2rem;
}

@media (min-width: 640px) {
  .tools-header { padding: 1rem 1.5rem; }
  .tools-logo { width: 2.5rem; height: 2.5rem; }
  .tools-brand { font-size: 1.25rem; }
  .tools-main { padding: 2rem 1.5rem 3rem; }
}