/* ── Header ── */
.site-header {
  background: #ffffff;
  border-bottom: 1px solid var(--border);
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
}

[data-theme="dark"] .site-header {
  background: var(--bg-primary);
  border-bottom-color: var(--border);
}

.site-header h1 {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 2px;
}

.header-nav {
  display: flex;
  gap: 16px;
  align-items: center;
}

.header-nav a {
  color: var(--text-secondary);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  text-decoration: none;
}

.header-nav a:hover,
.header-nav a.active {
  color: var(--text-primary);
  text-decoration: none;
}

/* ── Container ── */
.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ── Section Headers ── */
.section-header {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--text-secondary);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 16px;
}

/* ── Grid ── */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

/* ── Footer ── */
.footer {
  text-align: center;
  padding: 48px 24px;
  color: var(--text-secondary);
  font-size: 11px;
  letter-spacing: 0.5px;
}

/* ── Theme Toggle ── */
#themeToggle {
  background: #111;
  color: #fff;
  border: none;
  border-radius: 6px;
  padding: 6px 12px;
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  cursor: pointer;
  font-family: inherit;
}

[data-theme="dark"] #themeToggle {
  background: #e0e0e0;
  color: #1a1a1a;
}

/* ── Responsive ── */
@media (max-width: 640px) {
  .grid-2 { grid-template-columns: 1fr; }
  .container { padding: 0 16px; }
  .site-header { padding: 12px 16px; }
  .header-nav { gap: 10px; }
  .header-nav a { font-size: 10px; }
}