:root {
  --bg: #ffffff;
  --bg-soft: #f6f8fb;
  --bg-code: #f3f5f9;
  --fg: #1d2330;
  --fg-muted: #5b6475;
  --border: #e2e6ee;
  --accent: #1f4e9c;
  --accent-soft: #e8eefa;
  --warn-bg: #fff7e6;
  --warn-border: #f0c36d;
  --tag: #1f4e9c;
  --attr: #8a3ffc;
  --str: #1a7f37;
  --var: #c2410c;
  --comment: #8b93a3;
  --sidebar-w: 250px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #12151c;
    --bg-soft: #181c25;
    --bg-code: #1c212c;
    --fg: #e3e7ef;
    --fg-muted: #9aa3b5;
    --border: #2a303d;
    --accent: #7aa7ff;
    --accent-soft: #1d2a45;
    --warn-bg: #2a2416;
    --warn-border: #8a6d2c;
    --tag: #7aa7ff;
    --attr: #c4a1ff;
    --str: #7ee2a0;
    --var: #ffab70;
    --comment: #6c7488;
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --bg: #12151c;
  --bg-soft: #181c25;
  --bg-code: #1c212c;
  --fg: #e3e7ef;
  --fg-muted: #9aa3b5;
  --border: #2a303d;
  --accent: #7aa7ff;
  --accent-soft: #1d2a45;
  --warn-bg: #2a2416;
  --warn-border: #8a6d2c;
  --tag: #7aa7ff;
  --attr: #c4a1ff;
  --str: #7ee2a0;
  --var: #ffab70;
  --comment: #6c7488;
  color-scheme: dark;
}

* { box-sizing: border-box; }

html { scroll-padding-top: 72px; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

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

code, pre, kbd {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  font-size: 0.88em;
}

:not(pre) > code {
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.05em 0.35em;
  overflow-wrap: anywhere;
}
td :not(pre) > code, td > code { overflow-wrap: normal; }

/* ---------- top bar ---------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 12px;
  height: 56px;
  padding: 0 20px;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
  color: var(--fg);
}
.brand:hover { text-decoration: none; }
.brand .logo {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border-radius: 7px;
  background: var(--accent);
  color: var(--bg);
  font-size: 13px;
  font-family: ui-monospace, Menlo, monospace;
}
.topbar .spacer { flex: 1; }
.topbar a.gh, .icon-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--fg-muted);
  font-size: 14px;
  background: none;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 5px 10px;
  cursor: pointer;
}
.topbar a.gh:hover, .icon-btn:hover { color: var(--fg); text-decoration: none; }
.topbar a.try { color: var(--accent); border-color: var(--accent); }
.menu-btn { display: none; }

/* ---------- layout ---------- */
.layout {
  display: grid;
  grid-template-columns: var(--sidebar-w) minmax(0, 1fr);
  min-height: calc(100vh - 56px);
}

.sidebar {
  position: sticky;
  top: 56px;
  align-self: start;
  height: calc(100vh - 56px);
  overflow-y: auto;
  padding: 24px 16px 40px 20px;
  border-right: 1px solid var(--border);
  background: var(--bg-soft);
  font-size: 14.5px;
}
.sidebar h4 {
  margin: 18px 0 6px;
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--fg-muted);
}
.sidebar h4:first-child { margin-top: 0; }
.sidebar ul { list-style: none; margin: 0; padding: 0; }
.sidebar li a {
  display: block;
  padding: 3px 10px;
  border-radius: 6px;
  color: var(--fg);
}
.sidebar li a:hover { background: var(--accent-soft); text-decoration: none; }
.sidebar li a.active { background: var(--accent-soft); color: var(--accent); font-weight: 600; }
.sidebar li li a { padding-left: 22px; font-size: 13.5px; color: var(--fg-muted); }

main {
  padding: 36px 48px 80px;
  max-width: 1040px;
  width: 100%;
}

/* ---------- typography ---------- */
h1 { font-size: 2.1em; line-height: 1.2; margin: 0 0 0.4em; }
h2 {
  font-size: 1.5em;
  margin: 2.2em 0 0.6em;
  padding-bottom: 0.3em;
  border-bottom: 1px solid var(--border);
}
h3 { font-size: 1.2em; margin: 1.8em 0 0.5em; }
h4 { font-size: 1em; margin: 1.4em 0 0.4em; }
h2 code, h3 code { font-size: 0.9em; }
.lead { font-size: 1.15em; color: var(--fg-muted); margin-top: 0; }

.anchor { opacity: 0; margin-left: 6px; font-weight: 400; color: var(--fg-muted); }
h2:hover .anchor, h3:hover .anchor { opacity: 1; }

/* ---------- code blocks ---------- */
.code {
  position: relative;
  margin: 1em 0 1.3em;
}
pre {
  margin: 0;
  padding: 14px 16px;
  overflow-x: auto;
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: 8px;
  line-height: 1.55;
  tab-size: 2;
}
.code .copy {
  position: absolute;
  top: 8px;
  right: 8px;
  padding: 2px 8px;
  font-size: 12px;
  color: var(--fg-muted);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 5px;
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.15s;
}
.code:hover .copy, .code .copy:focus { opacity: 1; }
.code .label {
  display: block;
  font-size: 12px;
  color: var(--fg-muted);
  margin-bottom: 4px;
}

.tk-tag { color: var(--tag); }
.tk-attr { color: var(--attr); }
.tk-str { color: var(--str); }
.tk-var { color: var(--var); font-weight: 600; }
.tk-com { color: var(--comment); font-style: italic; }

/* ---------- tables ---------- */
.table-wrap { overflow-x: auto; margin: 1em 0 1.4em; }
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14.5px;
}
th, td {
  text-align: left;
  vertical-align: top;
  padding: 7px 10px;
  border-bottom: 1px solid var(--border);
}
th {
  background: var(--bg-soft);
  font-weight: 600;
  white-space: nowrap;
}
td:first-child:not([colspan]) { white-space: nowrap; }
td.default { color: var(--fg-muted); }
td:first-child:not([colspan]) code { white-space: nowrap; }

/* ---------- callouts & cards ---------- */
.note, .warn {
  margin: 1.2em 0;
  padding: 10px 14px;
  border-radius: 8px;
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  background: var(--accent-soft);
  font-size: 15px;
}
.warn { border-left-color: var(--warn-border); background: var(--warn-bg); }
.note p, .warn p { margin: 0.3em 0; }

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  gap: 14px;
  margin: 1.2em 0;
}
.card {
  display: block;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--fg);
  background: var(--bg-soft);
}
.card:hover { border-color: var(--accent); text-decoration: none; }
.card strong { display: block; margin-bottom: 4px; color: var(--accent); }
.card span { font-size: 14px; color: var(--fg-muted); }

.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 16px;
  margin: 1.2em 0;
}
.gallery figure { margin: 0; }
.gallery img, .shot {
  width: 100%;
  height: auto;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #fff;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.06);
}
.gallery figcaption { font-size: 13px; color: var(--fg-muted); margin-top: 6px; text-align: center; }

.split {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
  gap: 20px;
  align-items: start;
}

.tag-list { display: flex; flex-wrap: wrap; gap: 6px; margin: 0.6em 0 1.2em; padding: 0; list-style: none; }
.tag-list a {
  font-family: ui-monospace, Menlo, monospace;
  font-size: 13.5px;
  padding: 2px 8px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--bg-soft);
}

.pager {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-top: 56px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}
.pager a {
  flex: 1;
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
}
.pager a:hover { border-color: var(--accent); text-decoration: none; }
.pager .next { text-align: right; }
.pager small { display: block; color: var(--fg-muted); font-size: 12px; }

footer.site {
  margin-top: 40px;
  font-size: 13px;
  color: var(--fg-muted);
}

/* ---------- responsive ---------- */
@media (max-width: 860px) {
  .layout { grid-template-columns: minmax(0, 1fr); }
  .menu-btn { display: inline-flex; }
  .sidebar {
    position: fixed;
    top: 56px;
    left: 0;
    z-index: 15;
    width: 280px;
    max-width: 85vw;
    transform: translateX(-100%);
    transition: transform 0.2s;
  }
  body.nav-open .sidebar { transform: none; box-shadow: 0 0 30px rgba(0, 0, 0, 0.15); }
  main { padding: 24px 16px 64px; }
  .split { grid-template-columns: minmax(0, 1fr); }
  .topbar { padding: 0 12px; }
  .topbar a.gh .txt { display: none; }
}