/* ── HEADER ── */
.header {
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  padding: 16px 32px;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}
.header-inner {
  max-width: 1440px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.header h1 {
  font-size: 17px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.3px;
}
.header .meta {
  font-size: 12px;
  color: var(--text-muted);
  font-family: var(--mono);
}

/* ── SITE NAV ── */
.site-nav {
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  padding: 0 32px;
}
.site-nav-inner {
  max-width: 1440px;
  margin: 0 auto;
  display: flex;
  gap: 2px;
}
.site-nav a {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 16px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: all 0.15s;
}
.site-nav a:hover { color: var(--text); background: var(--bg-hover); }
.site-nav a.current { color: var(--blue); border-bottom-color: var(--blue); font-weight: 600; }
.site-nav svg { width: 14px; height: 14px; flex-shrink: 0; }

/* ── MAIN ── */
.main {
  max-width: 1440px;
  margin: 0 auto;
  padding: 24px 32px 64px;
}

/* ── PAGE TRANSITION ── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}
.page-enter { animation: fadeUp 0.2s ease; }

/* ── RESPONSIVE ── */
@media (max-width: 768px) {
  .header { padding: 14px 16px; }
  .site-nav { padding: 0 16px; }
  .main { padding: 16px 16px 48px; }
  .site-nav a { padding: 10px 12px; font-size: 12px; }
}