/* 公共页 / 首页外壳：内缩悬浮导航条 + 精简页脚 */
.tt-site {
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  background: var(--bg-page);
}
.tt-site > main { flex: 1; }

/* ---------- 页眉 ---------- */
.tt-site-header .tt-topbar-inner { flex-wrap: wrap; column-gap: 8px; }
.tt-site-header .tt-brand { margin-right: 12px; }

.tt-menu-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  margin-left: auto;
  border: 0;
  border-radius: var(--radius-md);
  background: var(--bg-card);
  box-shadow: inset 0 0 0 var(--hairline) var(--border);
  color: var(--text-1);
  cursor: pointer;
}
.tt-menu-toggle .tt-menu-close { display: none; }
.tt-menu-toggle[aria-expanded='true'] .tt-menu-open { display: none; }
.tt-menu-toggle[aria-expanded='true'] .tt-menu-close { display: inline; }

.tt-site-menu { width: 100%; }
/* 手机端展开菜单：超出可视高度时在菜单内滚动，不把页面顶出屏幕 */
@media (max-width: 959px) {
  .tt-site-menu.show {
    max-height: calc(100vh - 80px);
    max-height: calc(var(--vh) - var(--header-h) - var(--safe-top) - 16px);
    overflow-y: auto;
    overscroll-behavior: contain;
  }
  .tt-site-nav > .tt-nav-link { min-height: 48px; }
  .tt-site-actions .tt-btn { height: 44px; }
  .tt-menu-toggle { width: 44px; height: 44px; }
}
.tt-site-nav { display: flex; flex-direction: column; gap: 2px; padding: 8px 0; border-top: 0; box-shadow: inset 0 var(--hairline) 0 var(--border); }
.tt-site-nav > .tt-nav-link { width: 100%; min-height: 44px; }

.tt-site-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 12px 0 14px;
  border-top: 0;
  box-shadow: inset 0 var(--hairline) 0 var(--border);
}
.tt-site-actions .tt-btn { flex: 1; }

@media (min-width: 960px) {
  .tt-site-header .tt-topbar-inner { flex-wrap: nowrap; }
  .tt-menu-toggle { display: none; }
  .tt-site-menu.collapse:not(.show),
  .tt-site-menu {
    display: flex;
    align-items: center;
    flex: 1;
    width: auto;
    min-width: 0;
  }
  .tt-site-nav { flex-direction: row; align-items: center; padding: 0; border: 0; }
  .tt-site-nav > .tt-nav-link { width: auto; justify-content: center; min-height: 40px; }
  .tt-site-actions { margin-left: auto; flex-wrap: nowrap; padding: 0; border: 0; }
  .tt-site-actions .tt-btn { flex: none; }

}

/* ---------- 页脚 ---------- */
.tt-site-footer {
  margin-top: var(--section-y);
  padding: 48px 0 calc(24px + var(--safe-bottom));
  border-top: 0;
  box-shadow: inset 0 var(--hairline) 0 var(--border);
  background: var(--bg-card);
}
.tt-footer-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 32px 24px;
}
.tt-footer-brand { grid-column: 1 / -1; display: grid; gap: 12px; align-content: start; }
.tt-footer-brand p { margin: 0; max-width: 32ch; font: var(--t-body); color: var(--text-3); }
.tt-footer-col { display: grid; gap: 10px; align-content: start; }
.tt-footer-col h2 {
  margin: 0 0 4px;
  font: var(--t-body-strong);
  color: var(--text-1);
}
.tt-footer-col a { font: var(--t-body); }
.tt-footer-copy {
  margin: 40px 0 0;
  padding-top: 20px;
  border-top: 0;
  box-shadow: inset 0 var(--hairline) 0 var(--border);
  font: var(--t-caption);
  color: var(--text-3);
}
@media (min-width: 768px) {
  .tt-footer-grid { grid-template-columns: 2fr 1fr 1fr 1fr; }
  .tt-footer-brand { grid-column: auto; }
}
@media (max-width: 767px) {
  .tt-site-footer { margin-top: 40px; padding-top: 36px; }
  .tt-footer-grid { gap: 24px 16px; }
  .tt-footer-col { gap: 2px; }
  .tt-footer-col a { display: inline-flex; align-items: center; min-height: 36px; }
  .tt-footer-copy { margin-top: 28px; }
}