/* Layout — container, header, sections */

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.container--ui {
  max-width: none;
  padding-left: var(--space-md);
  padding-right: var(--space-md);
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background: rgba(10, 10, 12, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text-primary);
  letter-spacing: 0.02em;
}

.logo:hover {
  color: var(--accent);
}

.nav {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.nav a {
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.875rem;
}

.nav .btn-download {
  margin-left: var(--space-sm);
  padding: 0.35em 0.75em;
  font-size: 0.8rem;
  font-weight: 600;
  color: #fff;
  background: var(--accent);
  border: 1px solid var(--accent);
  text-decoration: none;
  transition: background var(--transition-fast);
}

.nav .btn-download:hover {
  background: var(--accent-hover);
  color: #fff;
}

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

/* Sections — compact */
.section {
  padding: var(--space-xl) 0;
}

.section-title {
  margin-bottom: var(--space-xs);
  color: var(--text-primary);
  font-size: 1.1rem;
}

.section-lead {
  margin-bottom: var(--space-md);
  max-width: 42ch;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* Two-column panels */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}

@media (max-width: 700px) {
  .two-col {
    grid-template-columns: 1fr;
  }

  .nav {
    gap: var(--space-md);
  }
}