.site-header {
  --nav-paper: #f6f8f3;
  --nav-forest: #173f35;
  --nav-ink: #19221b;
  --nav-lime: #d2f889;
  --nav-line: #dce4da;
  --nav-muted: #53635a;
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(246, 248, 243, .96);
  border-bottom: 1px solid var(--nav-line);
}

.site-header .nav-shell {
  min-height: 76px;
  gap: 24px;
}

.site-header .brand {
  min-height: 44px;
}

.site-header .brand-copy strong {
  color: var(--nav-forest);
}

.site-header .brand-copy small {
  color: var(--nav-muted);
}

.primary-nav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 4px;
}

.primary-nav > a,
.nav-logout button {
  display: inline-flex;
  position: relative;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 12px;
  color: var(--nav-muted);
  background: transparent;
  border: 1px solid transparent;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  line-height: 1.25;
  white-space: nowrap;
  transition: color .18s ease, background-color .18s ease, border-color .18s ease;
}

.primary-nav > a::after,
.nav-logout button::after {
  display: none;
}

.primary-nav > a:hover,
.primary-nav > a:focus-visible,
.primary-nav > a.is-active,
.primary-nav > a[aria-current="page"],
.nav-logout button:hover,
.nav-logout button:focus-visible {
  color: var(--nav-forest);
  background: #edf2e8;
  border-color: #d5e0d1;
}

.primary-nav > a.button.button-lime,
.primary-nav > a.nav-register {
  min-height: 44px;
  padding: 10px 16px;
  color: var(--nav-ink);
  background: var(--nav-lime);
  border-color: var(--nav-lime);
  font-weight: 700;
}

.primary-nav > a.button.button-lime:hover,
.primary-nav > a.button.button-lime:focus-visible,
.primary-nav > a.nav-register:hover,
.primary-nav > a.nav-register:focus-visible {
  color: var(--nav-ink);
  background: #e0fa9c;
  border-color: #e0fa9c;
}

.nav-library {
  position: relative;
}

.primary-nav > .nav-library > summary {
  display: inline-flex;
  position: relative;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 12px;
  color: var(--nav-muted);
  background: transparent;
  border: 1px solid transparent;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  line-height: 1.25;
  cursor: pointer;
  list-style: none;
  white-space: nowrap;
  transition: color .18s ease, background-color .18s ease, border-color .18s ease;
}

.primary-nav > .nav-library > summary::-webkit-details-marker {
  display: none;
}

.primary-nav > .nav-library > summary::after {
  content: '⌄';
  margin-left: 6px;
  color: currentColor;
  font-size: 12px;
  transform: translateY(-1px);
  transition: transform .18s ease;
}

.primary-nav > .nav-library[open] > summary::after {
  transform: rotate(180deg) translateY(-1px);
}

.primary-nav > .nav-library > summary:hover,
.primary-nav > .nav-library > summary:focus-visible,
.primary-nav > .nav-library > summary.is-active {
  color: var(--nav-forest);
  background: #edf2e8;
  border-color: #d5e0d1;
}

.nav-library-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  z-index: 2;
  display: grid;
  min-width: 176px;
  gap: 2px;
  padding: 8px;
  background: var(--nav-paper);
  border: 1px solid var(--nav-line);
  border-radius: 8px;
  box-shadow: 0 14px 28px rgba(25, 34, 27, .1);
}

.nav-library-menu a {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 10px 12px;
  color: var(--nav-muted);
  border-radius: 6px;
  font-size: 13px;
  font-weight: 600;
  line-height: 1.4;
  white-space: nowrap;
}

.nav-library-menu a:hover,
.nav-library-menu a:focus-visible,
.nav-library-menu a.is-active {
  color: var(--nav-forest);
  background: #edf2e8;
}

.nav-logout {
  margin: 0;
}

.library-subnav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 28px;
  padding: 8px 0;
  border-top: 1px solid var(--nav-line);
  border-bottom: 1px solid var(--nav-line);
}

.library-subnav a {
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  padding: 7px 13px;
  color: var(--nav-muted);
  border: 1px solid transparent;
  border-radius: 7px;
  font-size: 13px;
  font-weight: 700;
}

.library-subnav a:hover,
.library-subnav a:focus-visible,
.library-subnav a.is-active {
  color: var(--nav-forest);
  background: var(--nav-paper);
  border-color: var(--nav-line);
}

.library-subnav a.is-active {
  background: var(--nav-lime);
  border-color: var(--nav-lime);
}

.admin-subnav {
  display: grid;
  gap: 2px;
  margin: -2px 0 8px 46px;
  padding-left: 12px;
  border-left: 1px solid var(--nav-line);
}

.admin-subnav a {
  display: block;
  padding: 7px 9px;
  color: var(--nav-muted);
  border-radius: 6px;
  font-size: 12px;
  line-height: 1.35;
}

.admin-subnav a:hover,
.admin-subnav a:focus-visible,
.admin-subnav a.is-active {
  color: var(--nav-forest);
  background: var(--nav-paper);
}

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  flex: 0 0 44px;
  padding: 10px;
  color: var(--nav-forest);
  background: transparent;
  border: 1px solid var(--nav-line);
  border-radius: 8px;
}

@media (max-width: 1100px) {
  .site-header .nav-shell {
    min-height: 72px;
  }

  .site-header .brand-copy small {
    display: none;
  }

  .menu-toggle {
    display: grid;
    place-content: center;
    gap: 4px;
  }

  .menu-toggle > span:not(.sr-only) {
    display: block;
    width: 20px;
    height: 2px;
    margin: 0;
    background: currentColor;
  }

  .primary-nav {
    position: absolute;
    top: 100%;
    right: 0;
    left: 0;
    display: flex;
    align-items: stretch;
    flex-direction: column;
    gap: 4px;
    max-height: 0;
    padding: 0 16px;
    overflow: hidden;
    visibility: hidden;
    pointer-events: none;
    background: var(--nav-paper);
    border-bottom: 1px solid transparent;
    box-shadow: 0 14px 28px rgba(25, 34, 27, .08);
    transition: max-height .2s ease, padding .2s ease, border-color .2s ease;
  }

  .primary-nav.is-open {
    max-height: min(calc(100dvh - 88px), 40rem);
    padding: 12px 16px calc(16px + env(safe-area-inset-bottom));
    overflow-y: auto;
    visibility: visible;
    pointer-events: auto;
    border-bottom-color: var(--nav-line);
    overscroll-behavior: contain;
  }

  .primary-nav > a,
  .nav-logout,
  .nav-logout button,
  .primary-nav > .nav-library {
    width: 100%;
  }

  .primary-nav > a,
  .nav-logout button,
  .primary-nav > .nav-library > summary {
    justify-content: flex-start;
    min-height: 48px;
    padding: 12px;
  }

  .nav-library-menu {
    position: static;
    min-width: 0;
    margin: 0 0 4px 16px;
    padding: 0 0 4px 12px;
    background: transparent;
    border: 0;
    border-left: 1px solid var(--nav-line);
    border-radius: 0;
    box-shadow: none;
  }

  .nav-library-menu a {
    min-height: 44px;
    padding: 11px 12px;
    white-space: normal;
  }

  .admin-subnav {
    margin-left: 16px;
  }

  .primary-nav > a.button.button-lime,
  .primary-nav > a.nav-register {
    justify-content: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .primary-nav {
    transition: none;
  }

  .primary-nav > .nav-library > summary,
  .primary-nav > .nav-library > summary::after {
    transition: none;
  }
}

.site-footer {
  margin-top: 64px;
  padding: 48px 0 20px;
  color: var(--nav-ink, #19221b);
  background: #edf2e7;
  border-top: 1px solid var(--nav-line, #dce4da);
}

.site-footer .footer-grid {
  display: grid;
  grid-template-columns: minmax(240px, 1.3fr) repeat(2, minmax(150px, .7fr));
  gap: 32px;
  align-items: start;
}

.site-footer .brand-footer .brand-copy strong {
  color: var(--nav-forest, #173f35);
}

.site-footer .brand-footer .brand-copy small,
.site-footer .footer-note,
.site-footer .footer-links a,
.site-footer .footer-bottom {
  color: var(--nav-muted, #53635a);
}

.site-footer .footer-note {
  max-width: 300px;
  margin: 16px 0 0;
  font-size: 14px;
  line-height: 1.8;
}

.site-footer .footer-heading {
  margin: 0 0 12px;
  color: var(--nav-forest, #173f35);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .08em;
  line-height: 1.5;
}

.site-footer .footer-links {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2px;
  align-items: start;
  font-size: 14px;
}

.site-footer .footer-links a {
  display: inline-flex;
  align-items: center;
  width: max-content;
  max-width: 100%;
  min-height: 40px;
  padding: 8px 0;
  border-bottom: 1px solid transparent;
}

.site-footer .footer-links a:hover,
.site-footer .footer-links a:focus-visible {
  color: var(--nav-forest, #173f35);
  border-bottom-color: var(--nav-forest, #173f35);
}

.site-footer .footer-bottom {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-top: 40px;
  padding-top: 16px;
  border-top: 1px solid var(--nav-line, #dce4da);
  font-size: 12px;
  line-height: 1.6;
}

@media (max-width: 700px) {
  .site-footer .footer-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 28px 20px;
  }

  .site-footer .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 480px) {
  .site-footer .footer-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .site-footer .footer-brand {
    grid-column: 1 / -1;
  }

  .site-footer .footer-bottom {
    align-items: flex-start;
    flex-direction: column;
    gap: 6px;
  }
}