/* Overall page frame: top bar + sidebar + main + footer */
.top {
  position: sticky; top: 0; z-index: 100;
  display: flex; align-items: center; gap: 1rem;
  padding: .6rem 1.2rem;
  padding-left: max(1.2rem, env(safe-area-inset-left));
  padding-right: max(1.2rem, env(safe-area-inset-right));
  background: var(--bg-elev);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-1);
}
.brand {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: 0.08em;
}
.brand:hover { color: var(--accent); text-decoration: none; }
.top-nav { display: flex; gap: 1rem; flex: 1; }
.top-nav a { color: var(--ink-soft); font-size: 0.94rem; }
.top-nav a:hover { color: var(--accent); text-decoration: none; }
.top-tools { display: flex; gap: 4px; }
.tool-btn {
  min-width: 32px; height: 32px;
  padding: 0 .5rem;
  font-size: 0.85rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-elev);
  color: var(--ink-soft);
}
.tool-btn:hover { border-color: var(--accent); color: var(--accent); }
.tool-btn.active { background: var(--accent); border-color: var(--accent); color: white; }
.hamburger { font-size: 1.3rem; display: none; }

.layout {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  gap: 0;
  max-width: 1280px;
  margin: 0 auto;
  min-height: calc(100vh - 60px);
}

.sidebar {
  position: sticky;
  top: 60px;
  align-self: start;
  max-height: calc(100vh - 60px);
  overflow-y: auto;
  padding: 1.2rem 1rem 2rem;
  border-right: 1px solid var(--border);
  background: var(--bg);
}
.side-title { font-weight: 600; letter-spacing: 0.06em; color: var(--muted); font-size: 0.85rem; margin-bottom: .6rem; }
.side-group { margin-bottom: 1.2rem; }
.side-group-title { font-size: 0.78rem; color: var(--muted); text-transform: none; margin: .8rem 0 .3rem; padding-left: .2rem; letter-spacing: 0.04em; }
.side-list { list-style: none; padding: 0; margin: 0; }
.side-list li { margin: 0; }
.side-list a {
  display: flex; justify-content: space-between; align-items: baseline;
  padding: .32rem .5rem;
  border-radius: 4px;
  color: var(--ink-soft);
  font-size: 0.9rem;
}
.side-list a:hover { background: var(--bg-soft); color: var(--ink); text-decoration: none; }
.side-list a.active { background: var(--bg-soft); color: var(--accent); font-weight: 600; }
.side-list .count { color: var(--muted); font-size: 0.75rem; font-variant-numeric: tabular-nums; }

.main {
  padding: 2rem 2.5rem 4rem;
  min-width: 0;
}

.site-footer {
  border-top: 1px solid var(--border);
  padding: 2.4rem 1rem 1.6rem;
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.7;
  background: var(--bg-soft);
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.6rem;
  max-width: 720px;
  margin: 0 auto;
  padding-bottom: 1rem;
}
.footer-qr {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .3rem;
  flex-shrink: 0;
}
.footer-qr img {
  width: 96px;
  height: 96px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: white;
  padding: 4px;
  display: block;
}
.footer-scan { font-size: 0.75rem; color: var(--muted); }
.footer-text { max-width: 480px; }
.footer-name { color: var(--ink-soft); margin-bottom: .3rem; }
.footer-name strong { color: var(--accent); font-weight: 600; }
.footer-desc { font-size: 0.85rem; color: var(--muted); margin-bottom: .5rem; }
.footer-meta { font-size: 0.78rem; color: var(--muted); line-height: 1.6; }
.footer-copy { text-align: center; font-size: 0.82rem; color: var(--muted); padding-top: .8rem; border-top: 1px dashed var(--border); }
.footer-icp { text-align: center; font-size: 0.78rem; padding-top: .4rem; }
.footer-icp a { color: var(--muted); }
.footer-icp a:hover { color: var(--accent); }

@media (max-width: 640px) {
  .footer-inner { flex-direction: column; gap: 1rem; padding-bottom: .8rem; }
  .footer-text { text-align: center; }
}

.scrim {
  display: none;
  position: fixed; inset: 0;
  background: rgba(0,0,0,.5);
  z-index: 90;
}

@media (max-width: 900px) {
  .top-nav { display: none; }
  .hamburger { display: block; }
  .layout { grid-template-columns: 1fr; }
  .sidebar {
    position: fixed;
    top: 54px; bottom: 0; left: 0;
    width: 82%; max-width: 340px;
    padding-bottom: calc(2rem + env(safe-area-inset-bottom));
    padding-left: max(1rem, env(safe-area-inset-left));
    background: var(--bg-elev);
    border-right: 1px solid var(--border);
    box-shadow: var(--shadow-2);
    transform: translateX(-100%);
    transition: transform 0.24s ease;
    z-index: 95;
    overscroll-behavior: contain; /* stop scroll chaining to page */
  }
  body.nav-open { overflow: hidden; } /* lock page scroll when drawer open */
  body.nav-open .sidebar { transform: translateX(0); }
  body.nav-open .scrim { display: block; }
  .main {
    padding: 1.2rem 1rem 3rem;
    padding-left: max(1rem, env(safe-area-inset-left));
    padding-right: max(1rem, env(safe-area-inset-right));
  }
  .site-footer {
    padding-bottom: calc(1.6rem + env(safe-area-inset-bottom));
  }
  /* Mobile top bar: compact spacing, shrink tool buttons */
  .top { gap: .6rem; padding: .55rem .8rem; }
  .brand { font-size: 1.05rem; letter-spacing: 0.06em; }
  .top-tools { gap: 2px; }
  .tool-btn { min-width: 30px; height: 30px; padding: 0 .35rem; font-size: 0.78rem; }
  .hamburger { padding: 0 .3rem; line-height: 1; }
  .side-list a { padding: .5rem .6rem; min-height: 40px; } /* touch-friendly rows */
}