*, *::before, *::after {
  box-sizing: border-box;
}

:root {
  --font-serif: "Source Han Serif SC", "思源宋体", "Source Han Serif CN", "Noto Serif SC", "Songti SC", "STSong", "SimSun", serif;
  --font-sans: var(--font-serif);
  --app-sidebar-width: 82px;
  --nav-bg: #ebe5df;
  --nav-ink: #4a2f1b;
  --nav-ink-hover: #3a2414;
  --nav-accent: #3a2414;
  --nav-border: rgba(94, 80, 63, 0.18);
}

.app-sidebar {
  width: var(--app-sidebar-width);
  min-width: var(--app-sidebar-width);
  min-height: 100vh;
  background: var(--nav-bg);
  border-right: 0.5px solid var(--nav-border);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 16px 0 28px;
  gap: 0;
  z-index: 100;
  flex-shrink: 0;
  overflow: visible;
}

body > .app-sidebar {
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
}

.app > .app-sidebar {
  position: relative;
}

.app-logo-link {
  width: 50px;
  height: 44px;
  border: 0;
  border-radius: 12px;
  display: grid;
  place-items: center;
  margin: 0 0 24px;
  background: transparent;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.18s ease, transform 0.18s ease;
}

.app-logo-link:hover {
  background: rgba(94, 80, 63, 0.06);
  transform: translateY(-1px);
}

.app-logo {
  width: 44px;
  height: 38px;
  object-fit: contain;
  display: block;
}

.nav-items {
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex: 1;
  align-items: center;
}

.nav-item {
  width: 70px;
  padding: 11px 4px;
  border: 0;
  border-radius: 10px;
  background: transparent;
  color: var(--nav-ink);
  cursor: pointer;
  text-decoration: none;
  font-family: var(--font-serif);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
  transition: color 0.18s ease, background 0.18s ease;
}

.nav-item:hover {
  color: var(--nav-ink-hover);
  background: rgba(94, 80, 63, 0.06);
}

.nav-item.active,
.nav-item.is-active {
  color: var(--nav-accent);
  background: rgba(111, 91, 69, 0.1);
}

.nav-item svg {
  width: 22px;
  height: 22px;
  flex-shrink: 0;
  display: block;
}

.nav-label {
  color: inherit;
  font-size: 12px;
  letter-spacing: 0;
  line-height: 1.2;
  text-align: center;
  white-space: nowrap;
}

.app-nav-user {
  margin-top: 0;
}

.nav-user-avatar {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: rgba(74, 47, 27, 0.1);
  border: 1px solid rgba(74, 47, 27, 0.22);
  color: var(--nav-accent);
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 700;
  line-height: 1;
}

.app-nav-user svg,
.app-nav-user .nav-label {
  display: none;
}

@media (max-width: 760px) {
  :root {
    --app-sidebar-width: 72px;
  }

  .app-sidebar {
    width: var(--app-sidebar-width);
    min-width: var(--app-sidebar-width);
  }

  .app-logo-link,
  .nav-item {
    width: 62px;
  }

  .nav-label {
    font-size: 10px;
  }

  .nav-user-avatar {
    font-size: 15px;
  }
}

.mobile-sidebar-toggle,
.mobile-sidebar-backdrop {
  display: none;
}

@media (max-width: 960px) {
  .app > .sidebar.app-sidebar {
    display: flex;
    position: fixed;
    inset: 0 auto 0 0;
    width: 72px;
    min-width: 72px;
    min-height: 100vh;
    min-height: 100dvh;
    height: 100vh;
    height: 100dvh;
    z-index: 202;
    overflow-y: auto;
    overflow-x: hidden;
    transform: translateX(calc(-100% - 14px));
    transition: transform 220ms ease, box-shadow 220ms ease;
    box-shadow: none;
  }

  body.mobile-sidebar-open .app > .sidebar.app-sidebar {
    transform: translateX(0);
    box-shadow: 8px 0 28px rgba(61, 47, 34, 0.18);
  }

  .mobile-sidebar-toggle {
    position: fixed;
    left: max(14px, env(safe-area-inset-left));
    bottom: max(18px, env(safe-area-inset-bottom));
    z-index: 204;
    display: grid;
    width: 48px;
    height: 48px;
    place-items: center;
    padding: 0;
    border: 1px solid rgba(94, 80, 63, 0.18);
    border-radius: 50%;
    background: rgba(253, 252, 249, 0.96);
    color: var(--nav-ink);
    box-shadow: 0 7px 24px rgba(61, 47, 34, 0.2);
    cursor: pointer;
    transition: left 220ms ease, transform 160ms ease, background 160ms ease;
  }

  .mobile-sidebar-toggle:active {
    transform: scale(0.94);
  }

  .mobile-sidebar-toggle:focus-visible {
    outline: 2px solid var(--nav-accent);
    outline-offset: 3px;
  }

  body.mobile-sidebar-open .mobile-sidebar-toggle {
    left: calc(72px + max(12px, env(safe-area-inset-left)));
    background: var(--nav-bg);
  }

  .mobile-sidebar-toggle-icon {
    width: 19px;
    height: 15px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
  }

  .mobile-sidebar-toggle-icon span {
    display: block;
    width: 100%;
    height: 1.5px;
    border-radius: 999px;
    background: currentColor;
    transform-origin: center;
    transition: transform 180ms ease, opacity 180ms ease;
  }

  body.mobile-sidebar-open .mobile-sidebar-toggle-icon span:first-child {
    transform: translateY(6.75px) rotate(45deg);
  }

  body.mobile-sidebar-open .mobile-sidebar-toggle-icon span:nth-child(2) {
    opacity: 0;
  }

  body.mobile-sidebar-open .mobile-sidebar-toggle-icon span:last-child {
    transform: translateY(-6.75px) rotate(-45deg);
  }

  .mobile-sidebar-backdrop {
    position: fixed;
    inset: 0;
    z-index: 201;
    display: block;
    border: 0;
    background: rgba(42, 34, 25, 0.18);
    opacity: 0;
    pointer-events: none;
    transition: opacity 180ms ease;
  }

  body.mobile-sidebar-open .mobile-sidebar-backdrop {
    opacity: 1;
    pointer-events: auto;
  }

  body.mobile-sidebar-open {
    overflow: hidden;
  }
}

@media (prefers-reduced-motion: reduce) {
  .app > .sidebar.app-sidebar,
  .mobile-sidebar-toggle,
  .mobile-sidebar-toggle-icon span,
  .mobile-sidebar-backdrop {
    transition: none;
  }
}