:root {
  --bg: #0d1117;
  --panel: rgba(18, 24, 34, 0.94);
  --border: #2d3748;
  --text: #edf2f7;
  --muted: #a0aec0;
  --accent: #63b3ed;
  --accent-strong: #90cdf4;
  --code: #111827;
  --code-border: #334155;
  --code-accent: #90cdf4;
  --code-muted: #718096;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  min-height: 100%;
  background:
    radial-gradient(circle at top right, rgba(99, 179, 237, 0.16), transparent 28%),
    linear-gradient(180deg, #0a0f14 0%, var(--bg) 100%);
  color: var(--text);
  font-family: "Avenir Next", "Segoe UI", sans-serif;
  line-height: 1.72;
}

body { padding: 30px 18px 56px; }

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

a:hover {
  color: #bee3f8;
  text-decoration: underline;
}

.site-shell {
  max-width: 940px;
  margin: 0 auto;
  padding: 28px 30px 44px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 24px;
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.32);
}

.site-header,
.site-footer {
  display: flex;
  align-items: center;
}

.site-header {
  margin-bottom: 34px;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.site-footer {
  margin-top: 40px;
  padding-top: 18px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.94rem;
}

.site-brand {
  color: var(--text);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.95rem 1.15rem;
}

.site-nav a {
  color: var(--muted);
  font-size: 0.94rem;
}

.site-nav a:hover {
  color: var(--text);
}

.site-main h1:first-child { margin-top: 0; }

h1, h2, h3 {
  color: var(--text);
  line-height: 1.12;
  position: relative;
}

h1 {
  font-size: clamp(2.1rem, 5vw, 3.5rem);
  margin-bottom: 0.85rem;
}

h2 {
  font-size: 1.55rem;
  margin-top: 2.7rem;
}

h3 {
  font-size: 1.16rem;
  margin-top: 1.7rem;
}

p, li {
  color: var(--muted);
  font-size: 1rem;
}

strong { color: var(--text); }

.header-anchor {
  margin-left: 0.45rem;
  color: var(--accent);
  text-decoration: none;
  opacity: 0;
  transition: opacity 120ms ease;
}

h1:hover .header-anchor,
h2:hover .header-anchor,
h3:hover .header-anchor,
h1:focus-within .header-anchor,
h2:focus-within .header-anchor,
h3:focus-within .header-anchor {
  opacity: 1;
}

code, pre {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

code {
  padding: 0.14rem 0.38rem;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
}

pre {
  overflow-x: auto;
  padding: 18px 20px;
  border: 1px solid var(--code-border);
  border-radius: 4px;
  background: var(--code);
}

pre code {
  padding: 0;
  background: transparent;
}

.code-block {
  position: relative;
  margin: 1.2rem 0;
}

.code-block pre,
.highlight pre,
pre.highlight {
  margin: 0;
}

.copy-button {
  position: absolute;
  top: 12px;
  right: 12px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--code-border);
  border-radius: 4px;
  width: 1.95rem;
  height: 1.95rem;
  background: rgba(10, 15, 20, 0.92);
  color: var(--text);
  cursor: pointer;
}

.copy-button:hover {
  background: rgba(17, 24, 39, 0.98);
}

.copy-icon {
  width: 0.92rem;
  height: 0.92rem;
  fill: currentColor;
}

.highlight .c,
.highlight .cm,
.highlight .c1,
.highlight .cs { color: var(--code-muted); font-style: italic; }
.highlight .k,
.highlight .kc,
.highlight .kd,
.highlight .kn,
.highlight .kp,
.highlight .kr,
.highlight .kt { color: #f6ad55; font-weight: 600; }
.highlight .s,
.highlight .sa,
.highlight .sb,
.highlight .sc,
.highlight .sd,
.highlight .s1,
.highlight .s2,
.highlight .dl { color: #9ae6b4; }
.highlight .m,
.highlight .mf,
.highlight .mh,
.highlight .mi,
.highlight .il,
.highlight .mo { color: #fbb6ce; }
.highlight .na,
.highlight .nb,
.highlight .nc,
.highlight .nf,
.highlight .fm { color: #90cdf4; }
.highlight .o,
.highlight .ow,
.highlight .p { color: #cbd5e0; }
.highlight .nv,
.highlight .vc,
.highlight .vg,
.highlight .vi { color: var(--code-accent); }
.highlight .gh,
.highlight .gu { color: #e2e8f0; font-weight: 700; }
.highlight .gp { color: #63b3ed; }
.highlight .go,
.highlight .w { color: #94a3b8; }

blockquote {
  margin: 1.6rem 0;
  padding: 0.25rem 0 0.25rem 1rem;
  border-left: 4px solid var(--accent);
  color: var(--text);
}

img {
  max-width: 100%;
  height: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th, td {
  padding: 0.7rem 0.8rem;
  border: 1px solid var(--border);
  text-align: left;
}

th {
  background: rgba(99, 179, 237, 0.12);
}

@media (max-width: 720px) {
  body { padding: 18px 10px 36px; }
  .site-shell { padding: 22px 18px 28px; }
}