/* === Layout: Container, Navbar, Main Grid, Footer === */

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* ---- Navbar ---- */
.site-header {
  background: var(--bg-nav);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

/* Semi-transparent nav with blur */
@supports (backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px)) {
  .site-header { background: var(--bg-nav-blur, rgba(255,255,255,0.85)); }
}

.navbar-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}

.site-brand {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
}

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

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
}

.nav-links a {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 6px 12px;
  color: var(--text-secondary);
  font-size: 0.93rem;
  border-radius: var(--radius);
  transition: background 0.15s, color 0.15s;
}

.nav-links a:hover,
.nav-links a.active {
  background: var(--accent-light);
  color: var(--accent);
}

/* ---- Theme Toggle Button ---- */
.theme-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--bg-input);
  color: var(--text-secondary);
  font-size: 0.95rem;
  cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
  padding: 0;
  line-height: 1;
}

.theme-btn:hover {
  background: var(--accent-light);
  color: var(--accent);
  border-color: var(--accent);
}

/* Light mode: show moon, hide sun */
.theme-icon-dark { display: inline; }
.theme-icon-light { display: none; }

/* Dark mode: show sun, hide moon */
html.dark .theme-icon-dark { display: none; }
html.dark .theme-icon-light { display: inline; }

/* ---- Mobile nav toggle ---- */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.3rem;
  cursor: pointer;
  color: var(--text-primary);
  padding: 4px 8px;
}

/* ---- Main Content Grid ---- */
.page-body {
  padding: var(--gap) 0;
}

.content-grid {
  display: grid;
  grid-template-columns: 1fr var(--sidebar-width);
  gap: var(--gap);
  align-items: start;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

.main-content { min-width: 0; }
.sidebar-content { min-width: 0; }

/* Full-width pages (login / 404): single column, content centered */
.content-grid.full-width {
  grid-template-columns: 1fr;
}

/* ---- Footer ---- */
.site-footer {
  margin-top: 40px;
  padding: 24px 0;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.87rem;
  border-top: 1px solid var(--border);
  background: var(--bg-footer);
}

/* ---- Responsive ---- */
@media (max-width: 768px) {
  .content-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .nav-toggle { display: block; }

  .nav-links {
    display: none;
    position: absolute;
    top: 56px;
    left: 0;
    right: 0;
    background: var(--bg-nav);
    border-bottom: 1px solid var(--border);
    padding: 8px 20px;
    flex-direction: column;
    box-shadow: var(--shadow);
  }

  .nav-links.open { display: flex; }
  .nav-links a { width: 100%; padding: 10px 12px; }
}