:root {
  --kb-content-max: 1100px;
  --kb-ink: #24292f;
  --kb-muted: #57606a;
  --kb-accent: #0969da;
  --kb-bg: #f6f8fa;
  --kb-border: #d0d7de;
  --font-body: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--kb-ink);
  font-family: var(--font-body);
  line-height: 1.6;
  background: linear-gradient(180deg, #f6f8fa 0%, #ffffff 240px);
}

.kb-page-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 20px;
  border-bottom: 1px solid var(--kb-border);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
}

.kb-page-brand {
  margin: 0;
  font-size: 1rem;
  font-weight: 700;
  color: var(--kb-ink);
}

.kb-page-brand a {
  color: inherit;
  text-decoration: none;
}

.kb-page-nav a {
  color: var(--kb-accent);
  text-decoration: none;
  font-size: 14px;
}

.kb-page-nav a:hover {
  text-decoration: underline;
}

.kb-page-main {
  max-width: var(--kb-content-max);
  margin: 0 auto;
  padding: 16px 20px 40px;
}

.card {
  background: #fff;
  padding: 24px;
  border-radius: 12px;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
  width: 100%;
  box-sizing: border-box;
}

.kb-card {
  text-align: left;
}

.kb-page-title {
  text-align: center;
  margin: 0 0 4px;
  font-size: 1.5rem;
}

.kb-page-lede {
  text-align: center;
  margin: 0 0 12px;
  color: var(--kb-muted);
  font-size: 14px;
}

@media (max-width: 720px) {
  .kb-page-header {
    flex-direction: row;
    align-items: center;
    padding: 10px 12px;
  }

  .kb-page-brand {
    font-size: 0.9rem;
  }

  .kb-page-main {
    padding: 8px 10px 24px;
  }

  .card {
    padding: 10px;
    border-radius: 10px;
    box-shadow: none;
    border: 1px solid var(--kb-border);
  }

  .kb-page-title {
    font-size: 1.25rem;
  }

  .kb-page-lede {
    font-size: 13px;
    margin-bottom: 8px;
  }
}

/* Desktop: index drawer is always expanded, hide mobile summary */
@media (min-width: 721px) {
  .kb-index-drawer > .kb-index-drawer-summary {
    display: none;
  }

  .kb-index-drawer {
    display: block;
    min-width: 0;
  }
}

.kb-index-drawer {
  min-width: 0;
}

.kb-index-drawer-summary {
  display: none;
}

.kb-index-drawer-summary::-webkit-details-marker {
  display: none;
}
.kb-layout {
  --kb-sidebar-w: 220px;
  display: grid;
  grid-template-columns: var(--kb-sidebar-w) minmax(0, 1fr);
  gap: 20px;
  align-items: start;
  margin-top: 12px;
}
.kb-layout.kb-sidebar-collapsed { --kb-sidebar-w: 56px; }
.kb-index-shell {
  position: sticky;
  top: 64px;
  align-self: start;
  z-index: 3;
  max-height: calc(100vh - 76px);
  min-width: 0;
}
.kb-index {
  border: 1px solid #d0d7de;
  border-radius: 8px;
  background: #f6f8fa;
  padding: 10px 12px;
  max-height: calc(100vh - 112px);
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-width: thin;
}
.kb-group-order-reset {
  display: block;
  width: 100%;
  margin-top: 6px;
  border: 1px solid #d0d7de;
  background: #fff;
  padding: 5px 8px;
  border-radius: 6px;
  font-size: 11px;
  color: #57606a;
  cursor: pointer;
  box-sizing: border-box;
}
.kb-group-order-reset:hover { background: #eef1f4; color: #24292f; border-color: #afb8c1; }
.kb-sidebar-collapsed .kb-group-order-reset { display: none; }
.kb-search-wrap {
  position: relative;
  margin-bottom: 8px;
}
.kb-search-input {
  width: 100%;
  box-sizing: border-box;
  border: 1px solid #d0d7de;
  border-radius: 8px;
  padding: 7px 10px;
  font-size: 13px;
  background: #fff;
  color: #24292f;
}
.kb-search-input:focus {
  outline: none;
  border-color: #0969da;
  box-shadow: 0 0 0 3px rgba(9, 105, 218, 0.15);
}
.kb-search-meta {
  margin: 4px 0 0;
  font-size: 11px;
  color: #57606a;
}
.kb-search-results {
  list-style: none;
  margin: 6px 0 0;
  padding: 0;
  max-height: min(280px, 40vh);
  overflow-y: auto;
  border: 1px solid #d0d7de;
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 8px 24px rgba(140, 149, 159, 0.2);
}
.kb-search-results li { margin: 0; border-bottom: 1px solid #eaeef2; }
.kb-search-results li:last-child { border-bottom: none; }
.kb-search-hit {
  display: block;
  width: 100%;
  text-align: left;
  border: none;
  background: transparent;
  padding: 8px 10px;
  cursor: pointer;
  font: inherit;
  color: inherit;
}
.kb-search-hit:hover,
.kb-search-hit.kb-search-hit-active { background: #ddf4ff; }
.kb-search-hit-title { font-size: 13px; font-weight: 600; color: #0969da; line-height: 1.35; }
.kb-search-hit-section { font-size: 11px; color: #57606a; margin-top: 2px; }
.kb-search-hit-excerpt { font-size: 12px; color: #424a53; margin-top: 4px; line-height: 1.4; }
.kb-search-hit mark { background: #fff8c5; color: inherit; padding: 0 1px; border-radius: 2px; }
.kb-sidebar-collapsed .kb-search-input::placeholder { color: transparent; }
.kb-sidebar-collapsed .kb-search-input { padding: 7px 4px; text-align: center; }
.kb-index-toggle {
  position: absolute;
  top: 10px;
  right: -13px;
  width: 22px;
  height: 28px;
  padding: 0;
  border: 1px solid #d0d7de;
  border-radius: 0 6px 6px 0;
  background: #fff;
  color: #57606a;
  font-size: 16px;
  line-height: 1;
  cursor: pointer;
  box-shadow: 2px 0 6px rgba(0,0,0,0.06);
}
.kb-index-toggle:hover { background: #eef1f4; color: #24292f; }
.kb-index-label-short { display: none; }
.kb-sidebar-collapsed .kb-index { padding: 8px 4px; }
.kb-sidebar-collapsed .kb-index-group-summary { padding: 6px 2px; justify-content: center; }
.kb-sidebar-collapsed .kb-index-group-summary .kb-section-toggle { display: none; }
.kb-sidebar-collapsed .kb-index-group .kb-index-list { padding: 0 2px 6px; }
.kb-sidebar-collapsed .kb-index-label-full { display: none; }
.kb-sidebar-collapsed .kb-index-label-short { display: block; }
.kb-sidebar-collapsed .kb-index-group-title,
.kb-sidebar-collapsed .kb-index-link {
  display: block;
  text-align: center;
  font-size: 11px;
  line-height: 1.3;
  word-break: break-word;
}
.kb-sidebar-collapsed .kb-index-link { padding: 5px 2px; }
.kb-sidebar-collapsed .kb-index-group {
  margin-bottom: 4px;
  border-radius: 6px;
}
@media (max-width: 720px) {
  .kb-layout {
    grid-template-columns: 1fr;
    gap: 10px;
    margin-top: 8px;
  }

  .kb-index-drawer-summary {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    padding: 10px 12px;
    border: 1px solid var(--kb-border);
    border-radius: 8px;
    background: var(--kb-bg);
    font-size: 14px;
    font-weight: 600;
    color: var(--kb-ink);
    cursor: pointer;
    list-style: none;
    user-select: none;
  }

  .kb-index-drawer-summary::after {
    content: "▾";
    color: var(--kb-muted);
    font-size: 12px;
    transition: transform 0.15s ease;
  }

  .kb-index-drawer[open] > .kb-index-drawer-summary::after {
    transform: rotate(180deg);
  }

  .kb-index-drawer[open] > .kb-index-shell {
    margin-top: 8px;
  }

  .kb-index-shell {
    position: static;
    max-height: none;
  }

  .kb-index {
    max-height: min(50vh, 360px);
    padding: 8px 10px;
  }

  .kb-index-toggle {
    display: none;
  }

  .kb-sidebar-collapsed .kb-index-label-full {
    display: block;
  }

  .kb-sidebar-collapsed .kb-index-label-short {
    display: none;
  }

  .kb-sidebar-collapsed .kb-index {
    padding: 8px 10px;
  }

  .kb-article {
    padding: 12px 14px;
    min-height: 200px;
    font-size: 15px;
    line-height: 1.7;
    overflow-wrap: anywhere;
    word-break: break-word;
  }

  .kb-article h1 {
    font-size: 1.2rem;
    margin-bottom: 10px;
  }

  .kb-article h2 {
    font-size: 1.05rem;
    margin: 16px 0 6px;
  }

  .kb-article h3 {
    font-size: 0.98rem;
    margin: 12px 0 4px;
  }

  .kb-article p {
    margin: 6px 0;
  }

  .kb-ul {
    margin: 6px 0 6px 1.1em;
    padding-left: 0.4em;
  }

  .kb-ul li {
    margin: 4px 0;
  }

  .kb-table {
    display: block;
    width: max-content;
    min-width: 100%;
    max-width: none;
    overflow-x: auto;
    font-size: 12px;
    -webkit-overflow-scrolling: touch;
  }

  .kb-table th,
  .kb-table td {
    padding: 5px 6px;
  }

  .kb-code,
  .kb-snippet,
  .kb-terminal,
  .kb-diagram {
    padding: 10px;
    font-size: 11px;
    border-radius: 6px;
    -webkit-overflow-scrolling: touch;
  }

  .kb-section-summary {
    padding: 8px 10px;
    font-size: 0.95rem;
  }

  .kb-section-body {
    padding: 4px 10px 10px;
  }

  .kb-index-group-summary {
    padding: 7px 8px;
    font-size: 12px;
  }

  .kb-index-group .kb-index-list {
    padding: 0 6px 6px;
  }

  .kb-index-link {
    font-size: 13px;
    padding: 6px 4px;
  }

  .kb-flow-step {
    padding: 10px;
    gap: 8px;
  }

  .kb-mermaid-wrap {
    padding: 8px;
    margin: 8px 0 12px;
  }

  .kb-mermaid-wrap:has(svg[aria-roledescription="xychart"]) {
    padding: 8px 10px 12px;
  }

  .kb-article img.kb-img,
  .kb-figure img.kb-img {
    max-width: 100%;
  }

  .kb-math-block {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .kb-article .katex {
    font-size: 1em;
  }
}
.kb-index-list { list-style: none; margin: 0; padding: 0; }
.kb-index-list li { margin: 4px 0; }
.kb-index-link { color: #0969da; text-decoration: none; font-size: 14px; line-height: 1.4; display: block; padding: 4px 6px; border-radius: 6px; }
.kb-index-link:hover { background: #ddf4ff; }
.kb-index-link.active { background: #0969da; color: #fff; font-weight: 600; }
.kb-article { border: 1px solid #d0d7de; border-radius: 8px; background: #fff; padding: 16px 20px; min-height: 320px; font-size: 14px; line-height: 1.65; color: #24292f; }
.kb-article h1 { font-size: 1.35rem; margin: 0 0 12px; }
.kb-article h2 { font-size: 1.1rem; margin: 20px 0 8px; border-bottom: 1px solid #eaeef2; padding-bottom: 4px; }
.kb-article h3 { font-size: 1rem; margin: 16px 0 6px; }
.kb-article p { margin: 8px 0; }
.kb-article a { color: #0969da; }
.kb-article code { background: #f6f8fa; padding: 1px 5px; border-radius: 4px; font-size: 0.92em; }
.kb-figure { margin: 12px 0; padding: 0; }
.kb-article img.kb-img,
.kb-figure img.kb-img {
  display: block;
  max-width: min(100%, 640px);
  height: auto;
  border: 1px solid #d0d7de;
  border-radius: 6px;
  background: #111111;
}
.kb-ul { margin: 8px 0 8px 20px; }
.kb-table { width: 100%; border-collapse: collapse; margin: 12px 0; font-size: 13px; table-layout: fixed; }
.kb-table th, .kb-table td { border: 1px solid #d0d7de; padding: 6px 8px; text-align: left; word-break: break-word; overflow-wrap: anywhere; }
.kb-table th { background: #f6f8fa; }
.kb-code { background: #0d1117; color: #c9d1d9; padding: 12px; border-radius: 8px; overflow: auto; font-size: 12px; }
.kb-snippet, .kb-terminal, .kb-diagram {
  background: #f6f8fa; color: #24292f; border: 1px solid #d0d7de;
  padding: 12px 14px; border-radius: 8px; overflow: auto; font-size: 12px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace; line-height: 1.55; margin: 10px 0;
}
.kb-diagram { padding: 14px 16px; line-height: 1.45; white-space: pre; }
.kb-snippet code, .kb-terminal code, .kb-diagram code { background: transparent; padding: 0; font-size: inherit; }
.kb-snippet-label {
  display: inline-block; font-size: 11px; font-weight: 600; color: #57606a;
  text-transform: uppercase; letter-spacing: 0.04em; margin-bottom: 6px;
}
.kb-loading, .kb-error { color: #57606a; }
.kb-error { color: #cf222e; }
.kb-math-block { margin: 12px 0; overflow-x: auto; text-align: center; }
.kb-math-inline { display: inline-block; vertical-align: middle; margin: 0 1px; }
.kb-article .katex { font-size: 1.05em; }
.kb-flow { display: flex; flex-direction: column; align-items: center; gap: 0; margin: 16px 0 20px; }
.kb-flow-step {
  width: 100%; max-width: 520px; display: flex; gap: 12px; align-items: flex-start;
  padding: 12px 14px; border: 1px solid #d0d7de; border-radius: 10px;
  background: linear-gradient(180deg, #fff 0%, #f6f8fa 100%);
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}
.kb-flow-step-num {
  flex-shrink: 0; width: 28px; height: 28px; border-radius: 8px;
  background: #0969da; color: #fff; font-size: 13px; font-weight: 700;
  display: flex; align-items: center; justify-content: center; line-height: 1;
}
.kb-flow-step-body { flex: 1; min-width: 0; text-align: left; }
.kb-flow-step-title { font-weight: 600; font-size: 13px; margin-bottom: 4px; color: #24292f; }
.kb-flow-step-desc { font-size: 13px; line-height: 1.55; color: #424a53; }
.kb-flow-arrow {
  color: #8c959f; font-size: 18px; line-height: 1; padding: 2px 0; user-select: none;
}
.kb-section {
  border: 1px solid #d0d7de; border-radius: 8px; margin: 10px 0; background: #fff;
}
.kb-section-summary {
  cursor: pointer; padding: 10px 12px; font-weight: 600; font-size: 1.05rem;
  list-style: none; display: flex; align-items: center; gap: 8px; color: #24292f;
}
.kb-section-summary::-webkit-details-marker { display: none; }
.kb-section-toggle {
  flex-shrink: 0; width: 1.25em; text-align: center; font-weight: 700; color: #0969da; user-select: none;
}
.kb-section-toggle::before { content: '+'; }
.kb-section[open] > .kb-section-summary .kb-section-toggle::before { content: '−'; }
.kb-section-body { padding: 4px 14px 14px; border-top: 1px solid #eaeef2; }
.kb-section-body > :first-child { margin-top: 8px; }
.kb-index-group {
  border: 1px solid #d8dee4; border-radius: 8px; margin: 0 0 8px; background: #fff;
}
.kb-index-group-summary[draggable="true"] { cursor: grab; }
.kb-index-group.kb-index-group-dragging { opacity: 0.45; }
.kb-index-group.kb-group-drop-before { box-shadow: inset 0 3px 0 #0969da; }
.kb-index-group.kb-group-drop-after { box-shadow: inset 0 -3px 0 #0969da; }
.kb-index-group-summary {
  cursor: pointer; padding: 8px 10px; font-weight: 600; font-size: 13px;
  list-style: none; display: flex; align-items: center; gap: 6px; color: #24292f;
}
.kb-index-group-summary::-webkit-details-marker { display: none; }
.kb-index-group .kb-index-list { padding: 0 8px 8px; }
.kb-index-groups { list-style: none; margin: 0; padding: 0; }
.kb-mermaid-wrap {
  margin: 12px 0 16px; padding: 12px; border: 1px solid #d0d7de; border-radius: 8px;
  background: #fff; overflow-x: auto;
}
.kb-mermaid-wrap .mermaid { margin: 0; }
.kb-mermaid-wrap svg { max-width: 100%; height: auto; display: block; margin: 0 auto; }
/* xyChart 折線：Mermaid 無 plot lineWidth，預設偏細 */
.kb-mermaid-wrap svg[aria-roledescription="xychart"] g.line-plot-0 path {
  stroke-width: 3px;
}
/* xyChart：略增左右 padding，避免軸標籤貼邊（字級改由 Mermaid config 計入版面） */
.kb-mermaid-wrap:has(svg[aria-roledescription="xychart"]) {
  padding: 12px 20px 16px;
}
.kb-mermaid-wrap svg[aria-roledescription="xychart"] {
  overflow: visible;
}
.kb-mermaid-hint {
  margin: 0 0 10px; font-size: 12px; color: #57606a; line-height: 1.45;
}
.kb-mermaid-back {
  margin: 0 0 10px; padding: 4px 10px; font-size: 12px; cursor: pointer;
  border: 1px solid #d0d7de; border-radius: 6px; background: #f6f8fa; color: #24292f;
}
.kb-mermaid-back:hover { background: #eef1f4; border-color: #afb8c1; }
.kb-mermaid-interactive svg .node.clickable { cursor: pointer; }
.crypto-help-snippet {
  margin-top: 6px;
  width: 100%;
  text-align: left;
  border: 1px solid #d0d7de;
  border-radius: 8px;
  background: #f6f8fa;
  font-size: 11px;
  line-height: 1.5;
}
.crypto-help-snippet .kb-section-summary {
  padding: 6px 10px;
  font-size: 12px;
}
.crypto-help-snippet.hidden { display: none; }