:root {
  --bg: #0e1210;
  --bg-rail: #121816;
  --bg-card: #161c18;
  --ink: #e6ebe4;
  --muted: #8a958c;
  --line: #2a342e;
  --accent: #c45c3a;
  --accent-soft: rgba(196, 92, 58, 0.14);
  --accent-link: #e08a6a;
  --paper: #161c18;
  --serif: "Noto Serif TC", "Songti TC", serif;
  --sans: "Inter", "Source Sans 3", "Noto Sans TC", system-ui, sans-serif;
  --sidebar-w: 268px;
  --toc-w: 220px;
  --content-max: 720px;
  --code-bg: #1c2420;
  --pre-bg: #101512;
  --table-head: #1a221e;
  --body-gradient: radial-gradient(ellipse 80% 50% at 10% -10%, rgba(196, 92, 58, 0.1), transparent 55%),
    linear-gradient(180deg, #0e1210 0%, #0b0f0d 100%);
}

html[data-theme="light"] {
  --bg: #f6f4ef;
  --bg-rail: #ffffff;
  --bg-card: #ffffff;
  --ink: #1a211d;
  --muted: #5f6a63;
  --line: #dde3df;
  --accent: #b54a2a;
  --accent-soft: rgba(181, 74, 42, 0.1);
  --accent-link: #a04424;
  --paper: #ffffff;
  --code-bg: #eef1ee;
  --pre-bg: #f0f2f0;
  --table-head: #e8ece9;
  --body-gradient: linear-gradient(180deg, #f6f4ef 0%, #f0ede6 100%);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
}

body {
  background-image: var(--body-gradient);
}

.shell {
  display: grid;
  grid-template-columns: var(--sidebar-w) minmax(0, 1fr);
  min-height: 100vh;
  transition: grid-template-columns 0.2s ease;
}

.shell--rail-collapsed {
  --sidebar-w: 0px;
}

.shell--rail-collapsed .rail {
  overflow: hidden;
  padding-left: 0;
  padding-right: 0;
  border-right-color: transparent;
  opacity: 0;
  pointer-events: none;
}

.rail {
  position: sticky;
  top: 0;
  height: 100vh;
  overflow: auto;
  background: color-mix(in srgb, var(--bg-rail) 94%, black);
  border-right: 1px solid var(--line);
  padding: 1.1rem 0.85rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

html[data-theme="light"] .rail {
  background: color-mix(in srgb, var(--bg-rail) 96%, #f0ede6);
}

.brand .eyebrow {
  margin: 0;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
}

.brand-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.5rem;
}

.icon-btn {
  flex: none;
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--muted);
  border-radius: 6px;
  width: 28px;
  height: 28px;
  cursor: pointer;
  font: inherit;
  line-height: 1;
}

.icon-btn:hover {
  color: var(--accent-link);
  border-color: var(--accent);
}

.brand-title {
  display: block;
  margin: 0.15rem 0 0;
  font-family: var(--serif);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--ink);
  text-decoration: none;
}

.brand-sub {
  margin: 0.2rem 0 0;
  color: var(--muted);
  font-size: 0.82rem;
}

.search-wrap input {
  width: 100%;
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--ink);
  border-radius: 8px;
  padding: 0.5rem 0.65rem;
  font: inherit;
  font-size: 0.88rem;
}

.search-wrap input:focus {
  outline: 2px solid color-mix(in srgb, var(--accent) 55%, transparent);
  border-color: var(--accent);
}

.search-hits {
  margin: -0.35rem 0 0;
  font-size: 0.78rem;
  color: var(--muted);
  line-height: 1.4;
}

.nav-link__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.4rem;
}

.nav-link__title {
  min-width: 0;
}

.badge-new {
  flex: none;
  font-size: 0.62rem;
  letter-spacing: 0.06em;
  color: #f3d2c4;
  background: color-mix(in srgb, var(--accent) 55%, transparent);
  border-radius: 3px;
  padding: 0.05rem 0.28rem;
  line-height: 1.4;
}

.starter,
.toc {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.starter {
  padding-bottom: 0.35rem;
}

.nav-group {
  margin-top: 0.35rem;
}

.nav-group__toggle {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  width: 100%;
  border: 0;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.45rem 0.5rem;
  border-radius: 8px;
  cursor: pointer;
  text-align: left;
}

.nav-group__toggle:hover {
  background: var(--accent-soft);
  color: var(--ink);
}

.nav-group__label {
  flex: 1;
  min-width: 0;
}

.nav-group__count {
  font-family: ui-monospace, monospace;
  font-size: 0.62rem;
  opacity: 0.7;
}

.nav-group__chev {
  width: 0.45rem;
  height: 0.45rem;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(-45deg);
  transition: transform 0.15s ease;
  flex: none;
}

.nav-group--open .nav-group__chev {
  transform: rotate(45deg);
}

.nav-group__body {
  display: none;
  flex-direction: column;
  gap: 0.12rem;
  padding-left: 0.35rem;
  margin-left: 0.35rem;
  border-left: 1px solid var(--line);
}

.nav-group--open .nav-group__body {
  display: flex;
}

.sec-label {
  display: none;
}

.nav-link {
  display: block;
  text-align: left;
  width: 100%;
  border: 0;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-size: 0.88rem;
  padding: 0.38rem 0.55rem;
  border-radius: 8px;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.12s, color 0.12s;
}

.nav-link:hover,
.nav-link.active {
  background: var(--accent-soft);
  color: #f3d2c4;
}

.nav-link .blurb {
  display: block;
  margin-top: 0.12rem;
  font-size: 0.72rem;
  color: var(--muted);
  line-height: 1.35;
}

.rail-foot {
  margin-top: auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.65rem;
  padding-top: 0.85rem;
  border-top: 1px solid var(--line);
  font-size: 0.82rem;
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  margin-left: auto;
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--muted);
  border-radius: 999px;
  padding: 0.28rem 0.55rem;
  font: inherit;
  font-size: 0.78rem;
  cursor: pointer;
}

.theme-toggle:hover {
  border-color: var(--accent);
  color: var(--ink);
}

.theme-toggle__icon--sun {
  display: none;
}

.theme-toggle__icon--moon {
  display: inline;
}

.theme-toggle--light .theme-toggle__icon--sun {
  display: inline;
}

.theme-toggle--light .theme-toggle__icon--moon {
  display: none;
}

.theme-toggle--compact {
  margin-left: 0;
  padding: 0.3rem 0.45rem;
}

.theme-toggle--compact .theme-toggle__label {
  display: none;
}

.rail-foot a {
  color: var(--muted);
  text-decoration: none;
}

.rail-foot a:hover {
  color: var(--accent-link);
}

.docs-stage {
  min-width: 0;
  display: flex;
  flex-direction: column;
  position: relative;
}

.rail-expand-tab {
  display: none;
  position: fixed;
  left: 0;
  top: 1rem;
  z-index: 12;
  border: 1px solid var(--line);
  border-left: 0;
  border-radius: 0 8px 8px 0;
  background: var(--bg-rail);
  color: var(--muted);
  padding: 0.45rem 0.55rem 0.45rem 0.4rem;
  font: inherit;
  font-size: 0.95rem;
  line-height: 1;
  cursor: pointer;
  box-shadow: 2px 0 10px rgba(0, 0, 0, 0.12);
}

.rail-expand-tab:hover {
  color: var(--accent-link);
  border-color: var(--accent);
}

@media (min-width: 901px) {
  .rail-expand-tab:not([hidden]) {
    display: block;
  }
}

.topbar {
  display: none;
  align-items: center;
  gap: 0.75rem;
  padding: 0.65rem 1rem;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 5;
}

.topbar-title {
  flex: 1;
  min-width: 0;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--ink);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.docs-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) var(--toc-w);
  gap: 0;
  width: 100%;
  max-width: calc(var(--content-max) + var(--toc-w) + 4rem);
  margin: 0 auto;
  align-items: start;
}

.reader {
  min-width: 0;
  padding: 2rem 1.5rem 4rem;
  max-width: var(--content-max);
}

.doc-head {
  margin-bottom: 1.25rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--line);
}

.doc-head__crumb {
  margin: 0 0 0.35rem;
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
}

.doc-head__title {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(1.6rem, 3vw, 2rem);
  font-weight: 700;
  line-height: 1.2;
}

.doc-head__desc {
  margin: 0.55rem 0 0;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--muted);
}

.doc-head:not([hidden]) + .md > h1:first-child {
  display: none;
}

.toc-rail {
  position: sticky;
  top: 1.5rem;
  align-self: start;
  max-height: calc(100vh - 3rem);
  overflow: auto;
  padding: 2rem 1rem 4rem 0.5rem;
  border-left: 1px solid var(--line);
  display: none;
}

.toc-rail--visible {
  display: block;
}

.page-toc__label {
  margin: 0 0 0.55rem;
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-toc ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.page-toc a {
  display: block;
  color: var(--muted);
  text-decoration: none;
  font-size: 0.82rem;
  line-height: 1.45;
  padding: 0.18rem 0 0.18rem 0.55rem;
  border-left: 2px solid transparent;
}

.page-toc__item--h3 a {
  padding-left: 1rem;
  font-size: 0.78rem;
}

.page-toc__item--h4 a {
  padding-left: 1.45rem;
  font-size: 0.75rem;
}

.page-toc a:hover,
.page-toc a.active {
  color: #f3d2c4;
  border-left-color: var(--accent);
}

.md {
  font-size: 1rem;
  line-height: 1.75;
}

.md h1,
.md h2,
.md h3,
.md h4 {
  font-family: var(--serif);
  line-height: 1.3;
  margin: 1.5rem 0 0.65rem;
  scroll-margin-top: 5rem;
}

.md h2 {
  font-size: 1.28rem;
}

.md h3 {
  font-size: 1.08rem;
}

.md p,
.md li {
  color: color-mix(in srgb, var(--ink) 92%, var(--muted));
}

.md a {
  color: var(--accent-link);
}

.heading-anchor {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.heading-anchor__link {
  opacity: 0;
  color: var(--muted);
  text-decoration: none;
  font-family: var(--sans);
  font-size: 0.85em;
  font-weight: 400;
  transition: opacity 0.12s;
}

.heading-anchor:hover .heading-anchor__link,
.heading-anchor__link:focus {
  opacity: 1;
}

.md code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.88em;
  background: var(--code-bg);
  padding: 0.1em 0.35em;
  border-radius: 4px;
}

.md pre {
  overflow: auto;
  background: var(--pre-bg);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.9rem 1rem;
}

.md pre code {
  background: transparent;
  padding: 0;
}

.md table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
  margin: 1rem 0;
  display: block;
  overflow-x: auto;
}

.md th,
.md td {
  border: 1px solid var(--line);
  padding: 0.45rem 0.6rem;
  text-align: left;
  vertical-align: top;
}

.md th {
  background: var(--table-head);
}

.md blockquote {
  margin: 1rem 0;
  padding: 0.2rem 0 0.2rem 0.9rem;
  border-left: 3px solid var(--accent);
  color: var(--muted);
}

.md hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 1.75rem 0;
}

.pager {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  margin-top: 2.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
}

.pager__btn {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  text-align: left;
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--ink);
  border-radius: 8px;
  padding: 0.7rem 0.85rem;
  font: inherit;
  cursor: pointer;
}

.pager__btn--next {
  text-align: right;
  justify-self: end;
  width: 100%;
}

.pager__dir {
  font-size: 0.75rem;
  color: var(--muted);
}

.pager__title {
  font-size: 0.95rem;
  color: #f3d2c4;
}

.pager__btn:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.backdrop {
  display: none;
}

@media (max-width: 1100px) {
  .docs-grid {
    grid-template-columns: 1fr;
  }

  .toc-rail,
  .toc-rail--visible {
    display: none;
  }
}

@media (max-width: 900px) {
  .shell--rail-collapsed {
    --sidebar-w: 0px;
  }

  .shell--rail-collapsed .rail {
    opacity: 1;
    pointer-events: auto;
  }

  #railCollapseBtn {
    display: none;
  }

  .shell {
    grid-template-columns: 1fr;
  }

  .rail {
    position: fixed;
    inset: 0 auto 0 0;
    width: min(86vw, 320px);
    z-index: 20;
    transform: translateX(-105%);
    transition: transform 0.2s ease;
  }

  .rail.open {
    transform: translateX(0);
  }

  .topbar {
    display: flex;
  }

  .menu-btn {
    display: inline-block;
    border: 1px solid var(--line);
    background: var(--paper);
    color: var(--ink);
    border-radius: 6px;
    padding: 0.35rem 0.65rem;
    font: inherit;
    cursor: pointer;
  }

  .reader {
    padding: 1.25rem 1rem 3rem;
  }

  .backdrop {
    display: block;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.55);
    z-index: 15;
  }

  .backdrop[hidden] {
    display: none;
  }
}

.sr {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

html[data-theme="light"] .nav-link:hover,
html[data-theme="light"] .nav-link.active {
  color: var(--accent);
}

html[data-theme="light"] .page-toc a:hover,
html[data-theme="light"] .page-toc a.active {
  color: var(--accent);
}

html[data-theme="light"] .pager__title {
  color: var(--accent);
}

.wiki-login {
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--ink);
  border-radius: 999px;
  padding: 0.28rem 0.7rem;
  font: inherit;
  font-size: 0.78rem;
  cursor: pointer;
}

.wiki-login:hover,
.wiki-login--on {
  border-color: var(--accent);
  color: var(--accent);
}

.wiki-login--compact {
  font-size: 0.78rem;
  padding: 0.3rem 0.55rem;
}

.wiki-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(11.5rem, 1fr));
  gap: 0.75rem;
  margin: 1.25rem 0;
}

.wiki-card {
  display: block;
  border: 1px solid var(--line);
  background: var(--paper);
  border-radius: 10px;
  padding: 0.85rem 0.95rem;
  text-decoration: none;
  color: inherit;
}

.wiki-card:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.wiki-card strong {
  display: block;
  font-family: var(--serif);
  font-size: 1.02rem;
  color: var(--ink);
}

.wiki-card span {
  display: block;
  margin-top: 0.25rem;
  font-size: 0.78rem;
  color: var(--muted);
  line-height: 1.4;
}

.wiki-notes {
  margin-top: 2.75rem;
  padding-top: 1.4rem;
  border-top: 1px solid var(--line);
}

.wiki-notes h2 {
  font-family: var(--serif);
  font-size: 1.2rem;
  margin: 0 0 0.4rem;
}

.wiki-notes__hint,
.wiki-notes__empty {
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.6;
}

.wiki-note {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.75rem 0.9rem;
  margin: 0.65rem 0;
  background: var(--paper);
}

.wiki-note header {
  display: flex;
  justify-content: space-between;
  gap: 0.75rem;
  font-size: 0.82rem;
  color: var(--muted);
  margin-bottom: 0.35rem;
}

.wiki-note p {
  margin: 0;
  white-space: pre-wrap;
  line-height: 1.6;
}

.wiki-note__del {
  margin-top: 0.5rem;
  border: 0;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-size: 0.78rem;
  cursor: pointer;
  padding: 0;
}

.wiki-note__del:hover {
  color: var(--accent);
}

.wiki-notes__form textarea {
  width: 100%;
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--ink);
  border-radius: 8px;
  padding: 0.65rem 0.75rem;
  font: inherit;
  resize: vertical;
}

.wiki-notes__row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-top: 0.55rem;
}

.wiki-notes__form button[type="submit"] {
  border: 1px solid var(--accent);
  background: var(--accent-soft);
  color: var(--accent);
  border-radius: 8px;
  padding: 0.4rem 0.85rem;
  font: inherit;
  cursor: pointer;
}

.wiki-notes__status {
  font-size: 0.82rem;
  color: var(--muted);
}

.wiki-notes__login {
  margin-top: 0.75rem;
}