.sidebar {
  position: fixed;
  inset: 0 auto auto 0;
  z-index: 20;
  width: var(--sidebar-width);
  height: 100vh;
  padding: var(--space-6) 0 var(--space-6) var(--space-6);
  transition: padding 0.25s ease;
}

.sidebar__inner {
  /* Surface: .surface-panel (via portal_materials.css) applied in HTML. */
  position: relative;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  height: 100%;
  border-radius: 1.8rem;
  overflow: hidden;
  transition: border-radius 0.25s ease;
}

.sidebar__inner::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: var(--glass-noise) 0 0 / 120px 120px repeat;
  opacity: 0.04;
  mix-blend-mode: soft-light;
  pointer-events: none;
}

.sidebar-header {
  position: relative;
  z-index: 1;
  display: grid;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-4) 0;
}

.sidebar-header__top {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

/* ── Sidebar footer ─────────────────────────────── */

.sidebar-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  border-top: 1px solid rgb(255 255 255 / 0.1);
  flex-shrink: 0;
}

.sidebar-user {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  min-width: 0;
  color: inherit;
  text-decoration: none;
  padding: 0.3rem 1rem 0.3rem 0.3rem;
  border-radius: var(--radius-round, 9999px);
  transition: background 0.15s;
}

.sidebar-user:hover {
  background: var(--sidebar-hover-bg);
}

.sidebar-user:hover .sidebar-user__name {
  color: rgb(44 49 57 / 1);
}

.sidebar-user__avatar {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  background: rgb(255 255 255 / 0.18);
  color: rgb(255 255 255 / 0.75);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  overflow: hidden;
}

.sidebar-user__avatar-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.sidebar-user__name {
  font-size: var(--font-size-300);
  color: rgb(44 49 57 / 0.88);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sidebar-signin {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 0 28px;
  height: 28px;
  border-radius: 9999px;
  background: #000;
  color: #fff;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", sans-serif;
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.15s;
  line-height: 1;
}

.sidebar-signin:hover {
  background: #1c1c1e;
}

.sidebar-signin img {
  filter: invert(1);
  flex-shrink: 0;
  width: 12px;
  height: 12px;
  position: relative;
  top: -0.5px;
}

/* ── Background picker ──────────────────────────── */

.bg-picker {
  position: relative;
  flex-shrink: 0;
}

.bg-picker__trigger {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 0 6px 0 0;
  height: 28px;
  border: var(--material-control-border);
  border-radius: 8px;
  background: var(--material-control-bg);
  cursor: pointer;
  color: rgb(72 77 86 / 0.6);
  overflow: hidden;
  transition: background 0.15s;
}

.bg-picker__trigger:hover {
  background: var(--material-control-bg-focus);
}

.bg-picker__thumb {
  display: block;
  width: 44px;
  height: 100%;
  flex-shrink: 0;
  background-size: cover;
  background-position: center;
}

.bg-picker__panel {
  position: fixed;
  width: 260px;
  max-height: 420px;
  overflow: hidden;
  background: rgb(255 255 255 / 0.82);
  backdrop-filter: blur(24px) saturate(1.6);
  -webkit-backdrop-filter: blur(24px) saturate(1.6);
  border-radius: 12px;
  box-shadow: 0 4px 24px rgb(0 0 0 / 0.18), 0 1px 4px rgb(0 0 0 / 0.1);
  z-index: 9999;
}

.bg-picker__panel-inner {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  padding: 10px;
  max-height: 420px;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--scrollbar-thumb) transparent;
}

@supports selector(::-webkit-scrollbar) {
  .bg-picker__panel-inner {
    scrollbar-width: auto;
    scrollbar-color: auto;
  }
  .bg-picker__panel-inner::-webkit-scrollbar {
    width: 0.45rem;
    background: transparent;
  }
  .bg-picker__panel-inner::-webkit-scrollbar-track {
    background: transparent;
  }
  .bg-picker__panel-inner::-webkit-scrollbar-thumb {
    border-radius: 999px;
    background: var(--scrollbar-thumb);
  }
  .bg-picker__panel-inner::-webkit-scrollbar-thumb:hover {
    background: var(--scrollbar-thumb-hover);
  }
  .bg-picker__panel-inner::-webkit-scrollbar-corner {
    background: transparent;
  }
}

.bg-picker__option {
  display: grid;
  gap: 6px;
  padding: 6px;
  border-radius: 10px;
  border: 1px solid transparent;
  background: rgb(255 255 255 / 0.55);
  cursor: pointer;
  text-align: left;
  transition: border-color 0.15s, box-shadow 0.15s, background 0.15s;
}

.bg-picker__option-preview {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 10;
  border-radius: 7px;
  background-size: cover;
  background-position: center;
}

.bg-picker__option-label {
  display: block;
  color: rgb(32 36 42 / 0.88);
  font-size: 0.72rem;
  font-weight: var(--font-weight-semibold);
  line-height: 1.2;
}

.bg-picker__option:hover {
  background: rgb(255 255 255 / 0.72);
  box-shadow: 0 0 0 1px rgb(0 0 0 / 0.2);
}

.bg-picker__option--active {
  border-color: rgb(255 255 255 / 0.96);
  box-shadow: 0 0 0 2px rgb(0 0 0 / 0.25);
}

.site-shell--sidebar-collapsed .sidebar-footer {
  display: none;
}

.sidebar-collapse-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  width: 2.5rem;
  height: 1.5rem;
  border: 0;
  border-radius: 0.5rem;
  background: transparent;
  cursor: pointer;
  color: rgb(72 77 86 / 0.6);
  opacity: 0.7;
  transition: opacity 0.15s ease, background 0.15s ease;
}

.sidebar-collapse-btn:hover {
  opacity: 1;
}

.sidebar-collapse-btn img {
  display: block;
  width: 1.3rem;
  height: 1.3rem;
}

.sidebar-search {
  display: grid;
  grid-template-columns: 1rem minmax(0, 1fr);
  align-items: center;
  gap: var(--space-2);
  min-height: 2rem;
  padding: 0 0.75rem;
  border: var(--material-control-border);
  border-radius: 999px;
  background: var(--material-control-bg);
  overflow: hidden;
  transition: opacity 0.2s ease;
}

.sidebar-search:focus-within {
  border: var(--material-control-border-focus);
  background: var(--material-control-bg-focus);
}

.sidebar-search__icon {
  display: inline-grid;
  place-items: center;
  width: 1rem;
  height: 1rem;
}

.sidebar-search__icon img {
  display: block;
  width: 100%;
  height: 100%;
  opacity: 0.4;
}

.sidebar-search__input {
  width: 100%;
  min-width: 0;
  border: 0;
  background: transparent;
  color: rgb(28 32 38 / 0.9);
  font: inherit;
  font-size: 0.88rem;
  outline: none;
  -webkit-appearance: none;
  appearance: none;
}

.sidebar-search__input::placeholder {
  color: rgb(72 77 86 / 0.5);
}

.sidebar__nav {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  padding-left: var(--space-5);
  padding-right: var(--space-5);
}

.sidebar__body {
  position: relative;
  z-index: 1;
  flex: 1 1 auto;
  min-height: 0;
  overflow-y: auto;
  overflow-x: hidden;
  margin-right: var(--sidebar-scroll-offset);
  padding-bottom: var(--space-5);
  background: transparent;
  scrollbar-width: thin;
  scrollbar-color: var(--scrollbar-thumb) transparent;
}

@supports selector(::-webkit-scrollbar) {
  .sidebar__body {
    scrollbar-width: auto;
    scrollbar-color: auto;
  }

  .sidebar__body::-webkit-scrollbar {
    width: 0.45rem;
    background: transparent;
  }

  .sidebar__body::-webkit-scrollbar-track {
    background: transparent;
  }

  .sidebar__body::-webkit-scrollbar-track-piece {
    background: transparent;
  }

  .sidebar__body::-webkit-scrollbar-thumb {
    border-radius: 999px;
    background: var(--scrollbar-thumb);
  }

  .sidebar__body::-webkit-scrollbar-corner {
    background: transparent;
  }

  .sidebar__body::-webkit-resizer {
    background: transparent;
  }

  .sidebar__body::-webkit-scrollbar-thumb:hover {
    background: var(--scrollbar-thumb-hover);
  }
}

.sidebar__group {
  display: grid;
  gap: 0.15rem;
}

.sidebar__mode {
  display: flex;
  flex: 1 1 auto;
  gap: 0;
  height: 1.65rem;
  border: var(--material-control-border);
  border-radius: var(--radius-round, 9999px);
  background: var(--material-control-bg);
  overflow: visible;
}

.sidebar__mode-option {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 1 1 auto;
  height: 100%;
  padding-inline: var(--space-2);
  border-radius: var(--radius-round, 9999px);
  color: rgb(44 49 57 / 0.65);
  font-size: 0.78rem;
  font-weight: var(--font-weight-medium);
  text-decoration: none;
  transition: background-color 120ms ease, color 120ms ease;
}

.sidebar__mode-option:hover {
  color: rgb(24 29 36 / 0.94);
}

.sidebar__mode-option--active {
  background: var(--material-control-active-bg);
  box-shadow: var(--material-control-active-shadow);
  color: rgb(24 29 36 / 0.94);
}

.sidebar__tree,
.sidebar__children {
  display: grid;
  gap: 0.15rem;
}

.sidebar__label {
  padding: 0 var(--space-2) var(--space-1);
  font-size: 0.72rem;
  font-weight: var(--font-weight-semibold);
  letter-spacing: 0.01em;
  color: rgb(72 77 86 / 0.6);
}

.sidebar__link {
  display: grid;
  grid-template-columns: 1.15rem minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--space-2);
  width: 100%;
  min-height: 2rem;
  padding: 0 var(--space-2);
  border: var(--border-width-thin) solid transparent;
  border-radius: 0.5rem;
  color: rgb(44 49 57 / 0.88);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: normal;
  background: rgb(255 255 255 / 0);
  transition:
    background-color var(--duration-normal) var(--ease-standard),
    border-color var(--duration-normal) var(--ease-standard),
    color var(--duration-normal) var(--ease-standard);
}

.sidebar__game-link {
  display: grid;
  grid-template-columns: 1.15rem minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--space-2);
  width: 100%;
  min-height: 2rem;
  padding: 0 var(--space-2);
  border: var(--border-width-thin) solid transparent;
  border-radius: 0.5rem;
  color: rgb(44 49 57 / 0.88);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: normal;
  background: rgb(255 255 255 / 0);
  transition:
    background-color var(--duration-normal) var(--ease-standard),
    border-color var(--duration-normal) var(--ease-standard),
    color var(--duration-normal) var(--ease-standard);
}

.sidebar__group--tags .sidebar__link {
  grid-template-columns: minmax(0, 1fr) auto;
}

.sidebar__icon--empty {
  opacity: 0;
}

.sidebar__text {
  display: block;
  min-width: 0;
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.sidebar__toggle {
  appearance: none;
  text-align: left;
  cursor: pointer;
}

.sidebar__icon {
  display: inline-grid;
  place-items: center;
  width: 1.15rem;
  height: 1.15rem;
  color: rgb(84 89 99 / 0.72);
  flex: 0 0 auto;
}

.sidebar__icon svg {
  width: 100%;
  height: 100%;
  stroke: currentColor;
  stroke-width: 1.35;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.sidebar__symbol {
  width: 100%;
  height: 100%;
  background-color: currentColor;
  -webkit-mask-image: var(--sidebar-symbol);
  -webkit-mask-position: center;
  -webkit-mask-repeat: no-repeat;
  -webkit-mask-size: contain;
  mask-image: var(--sidebar-symbol);
  mask-position: center;
  mask-repeat: no-repeat;
  mask-size: contain;
}

.sidebar__link span:last-child {
  flex: 0 0 auto;
  min-width: 0;
}

.sidebar__branch--child .sidebar__children {
  padding-left: calc(var(--space-2) + 0.9rem);
}

.sidebar__link--child {
  padding-left: calc(var(--space-2) + 1.2rem);
  color: rgb(44 49 57 / 0.88);
}

.sidebar__link--child .sidebar__icon {
  color: rgb(112 118 128 / 0.72);
}

.sidebar__count {
  display: block;
  padding-left: var(--space-3);
  font-size: 0.82rem;
  color: rgb(96 101 111 / 0.72);
  pointer-events: none;
}

.sidebar__link--active .sidebar__count {
  color: rgb(43 117 214 / 0.9);
}

.sidebar__link:hover,
.sidebar__link:focus-visible,
.sidebar__game-link:hover,
.sidebar__game-link:focus-visible {
  background: var(--sidebar-hover-bg);
  color: rgb(24 28 34 / 0.96);
  outline: none;
}

.sidebar__link--active {
  background: rgb(0 0 0 / 0.08);
  border-color: transparent;
  color: rgb(20 24 31 / 0.98);
  font-weight: var(--font-weight-semibold, 600);
}

.sidebar__link--active .sidebar__count {
  color: rgb(var(--theme-rgb) / 0.9);
}

.sidebar__link--active .sidebar__icon,
.sidebar__link:hover .sidebar__icon,
.sidebar__link:focus-visible .sidebar__icon {
  color: rgb(var(--theme-rgb) / 0.95);
}