:root {
  --bg: #f6f8f7;
  --panel: #ffffff;
  --ink: #18212b;
  --muted: #64727f;
  --line: #dce4df;
  --accent: #0f8f85;
  --accent-strong: #096b64;
  --accent-soft: #e3f5f2;
  --gold: #b97812;
  --code-bg: #101820;
  --shadow: 0 18px 50px rgba(15, 28, 38, 0.08);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  background: var(--bg);
  color: var(--ink);
}

button,
input {
  font: inherit;
}

.site-shell {
  display: grid;
  grid-template-columns: 304px minmax(0, 1fr);
  min-height: 100vh;
}

.sidebar {
  position: sticky;
  top: 0;
  display: flex;
  flex-direction: column;
  gap: 18px;
  height: 100vh;
  padding: 22px 18px;
  overflow-y: auto;
  border-right: 1px solid var(--line);
  background: #fbfcfb;
}

.brand {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 12px;
  align-items: center;
  color: inherit;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 44px;
  height: 44px;
  place-items: center;
  border-radius: 8px;
  background: var(--ink);
  color: #ffffff;
  font-weight: 800;
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  font-size: 16px;
  line-height: 1.25;
}

.brand small {
  margin-top: 3px;
  color: var(--muted);
  font-size: 12px;
}

.search-box {
  display: grid;
  gap: 7px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
}

.search-box input {
  width: 100%;
  min-height: 40px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0 12px;
  background: #ffffff;
  color: var(--ink);
  outline: none;
}

.search-box input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(15, 143, 133, 0.14);
}

.doc-nav {
  display: grid;
  gap: 5px;
}

.doc-link {
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  gap: 9px;
  align-items: start;
  min-height: 42px;
  padding: 9px 10px;
  border-radius: 8px;
  color: var(--ink);
  text-decoration: none;
}

.doc-link:hover {
  background: #eef4f2;
}

.doc-link.is-active {
  background: var(--accent-soft);
  color: var(--accent-strong);
}

.doc-index {
  display: grid;
  width: 26px;
  height: 24px;
  place-items: center;
  border-radius: 6px;
  background: #edf1ef;
  color: var(--muted);
  font-size: 11px;
  font-weight: 800;
}

.doc-link.is-active .doc-index {
  background: var(--accent);
  color: #ffffff;
}

.doc-title {
  min-width: 0;
  overflow-wrap: anywhere;
  font-size: 14px;
  font-weight: 700;
  line-height: 1.45;
}

.main-panel {
  min-width: 0;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 12;
  display: none;
  grid-template-columns: 42px minmax(0, 1fr) 42px;
  align-items: center;
  min-height: 58px;
  padding: 8px 12px;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(16px);
}

.topbar-title {
  overflow: hidden;
  color: var(--ink);
  font-size: 15px;
  font-weight: 800;
  text-align: center;
  text-decoration: none;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.icon-button,
.text-button {
  border: 1px solid var(--line);
  background: #ffffff;
  color: var(--ink);
  cursor: pointer;
}

.icon-button {
  display: grid;
  width: 40px;
  height: 40px;
  place-items: center;
  border-radius: 8px;
  font-size: 18px;
  line-height: 1;
}

.text-button {
  min-height: 36px;
  border-radius: 8px;
  padding: 0 13px;
  font-size: 13px;
  font-weight: 700;
}

.icon-button:hover,
.text-button:hover {
  border-color: var(--accent);
  color: var(--accent-strong);
}

.icon-button:disabled,
.text-button:disabled {
  cursor: not-allowed;
  opacity: 0.48;
}

.reader {
  width: min(100%, 1060px);
  margin: 0 auto;
  padding: 34px 32px 80px;
}

.reader-head {
  display: flex;
  gap: 16px;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
}

.crumb {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.reader-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.markdown-body {
  padding: 44px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.loading-state,
.empty-state {
  display: grid;
  min-height: 220px;
  place-items: center;
  color: var(--muted);
  text-align: center;
}

.markdown-body > :first-child {
  margin-top: 0;
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4 {
  color: var(--ink);
  line-height: 1.25;
}

.markdown-body h1 {
  margin: 0 0 24px;
  font-size: 34px;
  letter-spacing: 0;
}

.markdown-body h2 {
  margin: 36px 0 14px;
  padding-top: 8px;
  font-size: 24px;
  letter-spacing: 0;
}

.markdown-body h3 {
  margin: 28px 0 12px;
  font-size: 18px;
  letter-spacing: 0;
}

.markdown-body h4 {
  margin: 24px 0 10px;
  font-size: 16px;
}

.markdown-body p,
.markdown-body li {
  color: #26323c;
  font-size: 16px;
  line-height: 1.82;
}

.markdown-body p {
  margin: 12px 0;
}

.markdown-body a {
  color: var(--accent-strong);
  font-weight: 700;
  text-underline-offset: 3px;
}

.markdown-body blockquote {
  margin: 18px 0;
  padding: 12px 16px;
  border-left: 4px solid var(--gold);
  background: #fff9ed;
  color: #4f3b13;
}

.markdown-body blockquote p {
  color: inherit;
}

.markdown-body ul,
.markdown-body ol {
  padding-left: 1.35em;
}

.markdown-body table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.table-wrap {
  width: 100%;
  margin: 18px 0;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.table-wrap table {
  margin: 0;
}

.markdown-body th,
.markdown-body td {
  min-width: 132px;
  padding: 11px 12px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.markdown-body th {
  background: #f1f5f3;
  color: var(--ink);
  font-weight: 800;
}

.markdown-body tr:last-child td {
  border-bottom: 0;
}

.markdown-body code {
  border-radius: 5px;
  padding: 2px 5px;
  background: #edf2f0;
  color: #0a5d56;
  font-size: 0.92em;
}

.markdown-body pre {
  overflow-x: auto;
  margin: 18px 0;
  border-radius: 8px;
  padding: 16px;
  background: var(--code-bg);
  color: #eef7f4;
}

.markdown-body pre code {
  padding: 0;
  background: transparent;
  color: inherit;
}

.mermaid {
  width: 100%;
  margin: 22px 0;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 18px;
  background: #ffffff;
}

.copy-toast {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 30;
  padding: 10px 14px;
  border-radius: 8px;
  background: var(--ink);
  color: #ffffff;
  font-size: 13px;
  font-weight: 700;
  box-shadow: var(--shadow);
}

.scrim {
  position: fixed;
  inset: 0;
  z-index: 18;
  background: rgba(10, 18, 24, 0.42);
}

@media (max-width: 860px) {
  .site-shell {
    display: block;
  }

  .sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    z-index: 20;
    width: min(86vw, 330px);
    transform: translateX(-105%);
    transition: transform 180ms ease;
    box-shadow: var(--shadow);
  }

  body.nav-open .sidebar {
    transform: translateX(0);
  }

  body.nav-open {
    overflow: hidden;
  }

  .topbar {
    display: grid;
  }

  .reader {
    padding: 20px 14px 48px;
  }

  .reader-head {
    display: grid;
    gap: 10px;
  }

  .reader-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

  .markdown-body {
    padding: 24px 18px;
  }

  .markdown-body h1 {
    font-size: 27px;
  }

  .markdown-body h2 {
    font-size: 21px;
  }

  .markdown-body p,
  .markdown-body li {
    font-size: 15px;
    line-height: 1.76;
  }

  .markdown-body th,
  .markdown-body td {
    min-width: 150px;
    padding: 10px;
  }
}

@media print {
  .sidebar,
  .topbar,
  .reader-head,
  .scrim {
    display: none;
  }

  .site-shell {
    display: block;
  }

  .reader {
    width: auto;
    padding: 0;
  }

  .markdown-body {
    padding: 0;
    border: 0;
    box-shadow: none;
  }
}