:root {
  --bg: #f6f6f7;
  --surface: #ffffff;
  --ink: #1a1c1d;
  --ink-soft: #5c5f62;
  --line: #e1e3e5;
  --brand: #008060;
  --brand-soft: #e3f1ed;
  --accent: #2c6ecb;
  --radius: 10px;
  --sidebar-w: 290px;
  font-synthesis: none;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Sidebar */
#sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--sidebar-w);
  height: 100vh;
  background: var(--surface);
  border-right: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  z-index: 30;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 18px 18px 12px;
  border-bottom: 1px solid var(--line);
}
.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 9px;
  background: var(--brand);
  color: #fff;
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.5px;
}
.brand strong { display: block; font-size: 15px; }
.brand small { color: var(--ink-soft); font-size: 12px; }

#search {
  margin: 12px 14px 6px;
  padding: 9px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-size: 14px;
  outline: none;
}
#search:focus { border-color: var(--brand); box-shadow: 0 0 0 3px var(--brand-soft); }

#nav {
  overflow-y: auto;
  padding: 6px 10px 30px;
  flex: 1;
}
.nav-section-title {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--ink-soft);
  padding: 14px 10px 5px;
}
.nav-link {
  display: block;
  padding: 7px 10px;
  border-radius: 7px;
  color: var(--ink);
  font-size: 14px;
  line-height: 1.3;
}
.nav-link:hover { background: var(--bg); text-decoration: none; }
.nav-link.active {
  background: var(--brand-soft);
  color: var(--brand);
  font-weight: 600;
}

/* Main */
#content {
  margin-left: var(--sidebar-w);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
#article {
  max-width: 820px;
  width: 100%;
  margin: 0 auto;
  padding: 44px 40px 30px;
  flex: 1;
}
.page-footer {
  max-width: 820px;
  width: 100%;
  margin: 0 auto;
  padding: 20px 40px 50px;
  color: var(--ink-soft);
  font-size: 13px;
  border-top: 1px solid var(--line);
}

/* Markdown */
.markdown-body { font-size: 15.5px; line-height: 1.7; color: var(--ink); }
.markdown-body h1 {
  font-size: 30px;
  margin: 0 0 6px;
  letter-spacing: -0.5px;
}
.markdown-body h1 + p { color: var(--ink-soft); font-size: 16px; margin-top: 0; }
.markdown-body h2 {
  font-size: 20px;
  margin: 34px 0 10px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
}
.markdown-body h3 { font-size: 17px; margin: 24px 0 8px; }
.markdown-body p { margin: 10px 0; }
.markdown-body ul, .markdown-body ol { padding-left: 22px; margin: 10px 0; }
.markdown-body li { margin: 5px 0; }
.markdown-body code {
  background: #eef0f1;
  padding: 2px 6px;
  border-radius: 5px;
  font-size: 13px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
.markdown-body pre {
  background: #1f2329;
  color: #e6e6e6;
  padding: 14px 16px;
  border-radius: 8px;
  overflow-x: auto;
}
.markdown-body pre code { background: none; padding: 0; color: inherit; }
.markdown-body blockquote {
  margin: 14px 0;
  padding: 10px 16px;
  background: var(--brand-soft);
  border-left: 4px solid var(--brand);
  border-radius: 0 8px 8px 0;
  color: #0f3d31;
}
.markdown-body blockquote p { margin: 4px 0; }
.markdown-body table { border-collapse: collapse; width: 100%; margin: 14px 0; font-size: 14px; }
.markdown-body th, .markdown-body td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; }
.markdown-body th { background: var(--bg); }
.markdown-body hr { border: none; border-top: 1px solid var(--line); margin: 28px 0; }
.route-badge {
  display: inline-block;
  background: #eef0f1;
  color: var(--ink-soft);
  font-family: ui-monospace, monospace;
  font-size: 12.5px;
  padding: 3px 9px;
  border-radius: 6px;
  margin-bottom: 14px;
}

/* Cards on home */
.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 14px; margin: 18px 0; }
.guide-card {
  display: block;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--ink);
}
.guide-card:hover { border-color: var(--brand); text-decoration: none; box-shadow: 0 2px 10px rgba(0,0,0,0.05); }
.guide-card strong { display: block; font-size: 15px; margin-bottom: 3px; }
.guide-card span { color: var(--ink-soft); font-size: 13px; }

/* Mobile */
#nav-toggle {
  display: none;
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 40;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  background: var(--surface);
  border-radius: 9px;
  font-size: 18px;
  cursor: pointer;
}
#overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.35);
  z-index: 25;
}

@media (max-width: 900px) {
  #nav-toggle { display: block; }
  #sidebar { transform: translateX(-100%); transition: transform 0.2s ease; }
  body.nav-open #sidebar { transform: translateX(0); }
  body.nav-open #overlay { display: block; }
  #content { margin-left: 0; }
  #article { padding: 70px 22px 24px; }
  .page-footer { padding: 20px 22px 40px; }
}