:root {
  color-scheme: light;
  --color-bg: #f7f8f6;
  --color-text: #29343c;
  --theme-color: #28695e;
  --font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-family-mono: ui-monospace, "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --font-size: 16px;
  --line-height: 1.68;
  --content-max-width: 78ch;
  --sidebar-width: 304px;
  --sidebar-bg: #ffffff;
  --sidebar-color: #34424b;
  --sidebar-link-color: #51616b;
  --sidebar-link-color-active: #1b6055;
  --sidebar-name-color: #193b36;
  --sidebar-link-spacing: 0.72em;
  --heading-color: #202d35;
  --strong-color: #26353d;
  --blockquote-bg: #edf4f1;
  --blockquote-color: #50615a;
  --code-bg: #edf1f3;
  --codeblock-bg: #16222b;
  --codeblock-color: #e4edf2;
  --border-color: #dce4e1;
  --table-row-alt-bg: #f0f4f2;
  --border-radius: 10px;
  --scroll-padding-top: 5rem;
}

:root[data-kb-theme="dark"] {
  color-scheme: dark;
  --color-bg: #101820;
  --color-text: #dce5eb;
  --theme-color: #8ecfc1;
  --sidebar-bg: #151f28;
  --sidebar-color: #dce5eb;
  --sidebar-link-color: #c1cdd5;
  --sidebar-link-color-active: #a2e2d5;
  --sidebar-name-color: #f0f5f8;
  --heading-color: #eef4f7;
  --strong-color: #eef4f7;
  --blockquote-bg: #18252c;
  --blockquote-color: #c0cdd4;
  --code-bg: #1b2832;
  --codeblock-bg: #0c1218;
  --codeblock-color: #e0e9ef;
  --border-color: #2b3a44;
  --table-row-alt-bg: #18232c;
}

html {
  min-width: 320px;
  scroll-behavior: smooth;
  scroll-padding-top: calc(24px + env(safe-area-inset-top, 0px));
  background: var(--color-bg);
}

body,
#app {
  min-height: 100vh;
  background: var(--color-bg);
  color: var(--color-text);
}

body {
  overflow-x: hidden;
}

.sidebar {
  padding-top: env(safe-area-inset-top, 0px);
  border-right: 1px solid var(--border-color);
  background: var(--sidebar-bg);
  color: var(--sidebar-color);
}

.sidebar-nav {
  padding: 0 14px calc(24px + env(safe-area-inset-bottom, 0px));
}

.sidebar-nav a,
.sidebar-nav p,
.sidebar-nav strong {
  line-height: 1.45;
}

.sidebar-nav a {
  display: block;
  min-height: 40px;
  padding: 9px 10px;
  border-radius: 8px;
  color: var(--sidebar-link-color);
  text-decoration: none;
}

.sidebar-nav a:hover {
  background: color-mix(in srgb, var(--theme-color), transparent 92%);
  color: var(--theme-color);
}

.sidebar-nav li.active > a {
  border-left: 3px solid var(--theme-color);
  border-radius: 0 8px 8px 0;
  background: color-mix(in srgb, var(--theme-color), transparent 91%);
  color: var(--sidebar-link-color-active);
  font-weight: 650;
}

.sidebar-nav > ul > li > p {
  margin: 1.1em 0 0.35em;
  padding: 0 10px;
  color: var(--sidebar-name-color);
  font-size: 0.88rem;
  font-weight: 700;
  letter-spacing: 0.025em;
}

.sidebar-nav ul ul {
  padding-left: 12px;
}

.sidebar-toggle {
  top: max(8px, env(safe-area-inset-top, 0px));
  left: 8px;
  z-index: 50;
  display: grid;
  min-width: 48px;
  min-height: 48px;
  place-items: center;
  padding: 10px;
  border: 1px solid var(--border-color);
  border-radius: 14px;
  background: color-mix(in srgb, var(--sidebar-bg), transparent 5%);
  box-shadow: 0 4px 16px color-mix(in srgb, var(--color-text), transparent 91%);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.content {
  padding-top: calc(16px + env(safe-area-inset-top, 0px));
}

.markdown-section {
  max-width: var(--content-max-width);
  padding: 0 clamp(18px, 4.5vw, 46px) calc(112px + env(safe-area-inset-bottom, 0px));
  color: var(--color-text);
  font-size: clamp(1rem, 0.96rem + 0.18vw, 1.08rem);
  line-height: 1.76;
  overflow-wrap: anywhere;
}

.markdown-section h1,
.markdown-section h2,
.markdown-section h3,
.markdown-section h4 {
  color: var(--heading-color);
  line-height: 1.28;
  scroll-margin-top: calc(70px + env(safe-area-inset-top, 0px));
}

.markdown-section h1 {
  margin-top: 0.45em;
  font-size: clamp(1.9rem, 5vw, 2.7rem);
  letter-spacing: -0.035em;
}

.markdown-section h2 {
  margin-top: 2.25em;
  padding-bottom: 0.35em;
  border-bottom: 1px solid var(--border-color);
  letter-spacing: -0.018em;
}

.markdown-section h3 {
  margin-top: 1.8em;
}

.markdown-section p,
.markdown-section li {
  line-height: 1.76;
}

.markdown-section a {
  text-underline-offset: 0.18em;
  text-decoration-thickness: 1px;
}

.markdown-section blockquote {
  border-radius: 0 10px 10px 0;
  background: var(--blockquote-bg);
  color: var(--blockquote-color);
}

.markdown-section table {
  display: block;
  width: max-content;
  max-width: 100%;
  overflow-x: auto;
  border-spacing: 0;
  -webkit-overflow-scrolling: touch;
}

.markdown-section th,
.markdown-section td {
  min-width: 7rem;
  vertical-align: top;
}

.markdown-section pre {
  position: relative;
  max-width: 100%;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  border: 1px solid color-mix(in srgb, var(--border-color), transparent 35%);
  border-radius: 12px;
  -webkit-overflow-scrolling: touch;
}

.markdown-section pre.kb-has-copy {
  padding-top: 2.8rem;
}

.markdown-section pre code {
  display: block;
  min-width: max-content;
  color: var(--codeblock-color);
  line-height: 1.6;
}

.markdown-section :not(pre) > code {
  border-radius: 5px;
  background: var(--code-bg);
  color: var(--color-text);
  padding: 0.12em 0.35em;
}

.markdown-section img {
  max-width: 100%;
  height: auto;
  border-radius: 12px;
  cursor: zoom-in;
}

.kb-toolbar {
  position: sticky;
  top: env(safe-area-inset-top, 0px);
  z-index: 15;
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px;
  margin: 0 clamp(14px, 4vw, 40px) 18px;
  padding: 8px 0;
  pointer-events: none;
}

.kb-toolbar a,
.kb-toolbar button {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 0 14px;
  border: 1px solid var(--border-color);
  border-radius: 999px;
  background: color-mix(in srgb, var(--sidebar-bg), transparent 4%);
  color: var(--color-text);
  font: inherit;
  font-size: 0.82rem;
  font-weight: 600;
  line-height: 1;
  text-decoration: none;
  cursor: pointer;
  pointer-events: auto;
  box-shadow: 0 3px 14px color-mix(in srgb, var(--color-text), transparent 93%);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.kb-toolbar a:hover,
.kb-toolbar button:hover {
  border-color: var(--theme-color);
  color: var(--theme-color);
}

.kb-toc-toggle {
  position: fixed;
  top: 50%;
  right: max(0px, env(safe-area-inset-right, 0px));
  z-index: 42;
  display: flex;
  min-width: 46px;
  min-height: 126px;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 10px;
  transform: translateY(-50%);
  border: 1px solid var(--border-color);
  border-right: 0;
  border-radius: 14px 0 0 14px;
  background: var(--sidebar-bg);
  color: var(--color-text);
  font: inherit;
  font-size: 0.78rem;
  font-weight: 650;
  letter-spacing: 0.02em;
  writing-mode: vertical-rl;
  cursor: pointer;
  box-shadow: 0 6px 22px color-mix(in srgb, var(--color-text), transparent 86%);
}

.kb-toc-toggle:hover,
.kb-toc-toggle[aria-expanded="true"] {
  background: var(--theme-color);
  color: var(--color-bg);
}

.kb-toc-toggle:focus-visible,
.kb-toc-close:focus-visible,
.kb-toc-panel a:focus-visible,
.sidebar-nav a:focus-visible,
.sidebar-toggle:focus-visible,
.kb-toolbar a:focus-visible,
.kb-toolbar button:focus-visible,
.kb-back-to-top:focus-visible,
.kb-copy-code:focus-visible {
  outline: 3px solid var(--theme-color);
  outline-offset: 3px;
}

.kb-toc-panel {
  position: fixed;
  top: 50%;
  right: calc(54px + env(safe-area-inset-right, 0px));
  z-index: 41;
  width: min(340px, calc(100vw - 78px));
  max-height: min(78dvh, 620px);
  overflow: auto;
  transform: translateY(-50%);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  background: var(--sidebar-bg);
  color: var(--color-text);
  box-shadow: 0 18px 60px color-mix(in srgb, #000, transparent 72%);
  overscroll-behavior: contain;
  -webkit-overflow-scrolling: touch;
}

.kb-toc-panel[hidden] {
  display: none;
}

.kb-toc-panel-header {
  position: sticky;
  top: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border-color);
  background: var(--sidebar-bg);
  color: var(--heading-color);
}

.kb-toc-panel-header strong {
  font-size: 0.94rem;
}

.kb-toc-close {
  display: grid;
  width: 40px;
  height: 40px;
  flex: 0 0 auto;
  place-items: center;
  border: 1px solid var(--border-color);
  border-radius: 50%;
  background: var(--color-bg);
  color: var(--color-text);
  font: inherit;
  font-size: 1.25rem;
  cursor: pointer;
}

.kb-toc-list {
  display: grid;
  gap: 3px;
  margin: 0;
  padding: 12px;
  list-style: none;
}

.kb-toc-list a {
  display: block;
  min-height: 42px;
  padding: 10px 12px;
  border-radius: 9px;
  color: var(--sidebar-link-color);
  font-size: 0.88rem;
  line-height: 1.4;
  text-decoration: none;
}

.kb-toc-list a:hover {
  background: color-mix(in srgb, var(--theme-color), transparent 90%);
  color: var(--theme-color);
}

.kb-toc-list [data-level="3"] a {
  padding-left: 25px;
  font-size: 0.84rem;
}

.kb-toc-list [data-level="4"] a {
  padding-left: 38px;
  font-size: 0.82rem;
}

.kb-back-to-top {
  position: fixed;
  right: max(16px, env(safe-area-inset-right, 0px));
  bottom: max(18px, env(safe-area-inset-bottom, 0px));
  z-index: 25;
  display: grid;
  min-width: 48px;
  min-height: 48px;
  place-items: center;
  border: 1px solid var(--border-color);
  border-radius: 50%;
  background: var(--sidebar-bg);
  color: var(--color-text);
  font-size: 1.25rem;
  cursor: pointer;
  box-shadow: 0 4px 16px color-mix(in srgb, var(--color-text), transparent 88%);
}

.kb-offline-status {
  position: fixed;
  bottom: max(18px, env(safe-area-inset-bottom, 0px));
  left: 50%;
  z-index: 60;
  max-width: min(560px, calc(100vw - 32px));
  transform: translateX(-50%);
  padding: 11px 16px;
  border: 1px solid var(--border-color);
  border-radius: 999px;
  background: var(--sidebar-bg);
  color: var(--color-text);
  font-size: 0.86rem;
  line-height: 1.35;
  text-align: center;
  box-shadow: 0 8px 28px color-mix(in srgb, #000, transparent 82%);
}

.kb-offline-status[hidden] {
  display: none;
}

.kb-offline-status[data-state="loading"] {
  border-color: var(--theme-color);
}

.kb-offline-status[data-state="error"] {
  border-color: #b45247;
}

.kb-copy-code {
  position: absolute;
  top: 8px;
  right: 8px;
  min-height: 38px;
  padding: 0 12px;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background: var(--sidebar-bg);
  color: var(--color-text);
  font: inherit;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
}

.kb-mermaid {
  max-width: 100%;
  margin: 1.25rem 0;
  overflow-x: auto;
  border: 1px solid var(--border-color);
  border-radius: 12px;
  background: color-mix(in srgb, var(--color-bg), var(--theme-color) 3%);
  padding: 12px;
}

.kb-mermaid svg {
  max-width: 100%;
  height: auto;
}

.kb-lightbox {
  width: min(96vw, 1200px);
  max-width: none;
  max-height: 92dvh;
  padding: 12px;
  border: 1px solid var(--border-color);
  border-radius: 16px;
  background: var(--sidebar-bg);
}

.kb-lightbox::backdrop {
  background: rgb(4 10 15 / 78%);
  backdrop-filter: blur(3px);
}

.kb-lightbox img {
  display: block;
  max-width: 100%;
  max-height: calc(92dvh - 24px);
  margin: auto;
  object-fit: contain;
}

@media (max-width: 768px) {
  .content {
    padding-top: calc(64px + env(safe-area-inset-top, 0px));
  }

  .kb-toolbar {
    position: fixed;
    top: env(safe-area-inset-top, 0px);
    right: 8px;
    left: 58px;
    margin: 0;
    justify-content: flex-end;
    gap: 6px;
    padding: 6px 0;
  }

  .kb-toolbar a,
  .kb-toolbar button {
    min-height: 42px;
    padding: 0 10px;
    font-size: 0.76rem;
  }

  .markdown-section {
    padding-right: 18px;
    padding-left: 18px;
    font-size: 1rem;
  }

  .markdown-section h1 {
    font-size: clamp(1.8rem, 8vw, 2.3rem);
  }

  .sidebar-toggle {
    left: 7px;
  }

  .kb-toc-panel {
    right: calc(52px + env(safe-area-inset-right, 0px));
    width: min(330px, calc(100vw - 72px));
    max-height: min(74dvh, 580px);
    border-radius: 14px;
  }

  .kb-toc-toggle {
    min-width: 44px;
    min-height: 118px;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}