:root {
  color-scheme: dark;
  --ink: #e8eef7;
  --muted: #93a4bd;
  --dim: #6b7c95;
  --bg0: #071018;
  --bg1: #0c1a28;
  --panel: rgba(12, 28, 42, 0.82);
  --line: rgba(125, 211, 252, 0.16);
  --teal: #2dd4bf;
  --code-bg: #050b12;
  --radius: 12px;
  --font: "Sora", ui-sans-serif, system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, Consolas, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; background: var(--bg0); }
body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font: 16px/1.6 var(--font);
  background:
    radial-gradient(900px 480px at 12% -10%, rgba(45, 212, 191, 0.18), transparent 55%),
    radial-gradient(700px 420px at 90% 0%, rgba(56, 189, 248, 0.12), transparent 50%),
    linear-gradient(180deg, var(--bg1), var(--bg0));
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.35;
  background-image:
    linear-gradient(rgba(148, 163, 184, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(148, 163, 184, 0.06) 1px, transparent 1px);
  background-size: 28px 28px;
  mask-image: radial-gradient(ellipse at 50% 20%, #000 20%, transparent 75%);
}

.shell {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  max-width: 1100px;
  margin: 0 auto;
  min-height: 100vh;
}

.sidebar {
  position: sticky;
  top: 0;
  align-self: start;
  height: 100vh;
  padding: 1.75rem 1.1rem 1.5rem 1.25rem;
  border-right: 1px solid var(--line);
  background: rgba(7, 16, 24, 0.55);
  backdrop-filter: blur(10px);
}

.brand { display: block; text-decoration: none; color: inherit; margin-bottom: 1.5rem; }
.brand-mark {
  font-size: 0.72rem; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--teal); font-weight: 600;
}
.brand-name {
  display: block; margin-top: 0.35rem; font-size: 1.35rem; font-weight: 700;
  letter-spacing: -0.03em; line-height: 1.15;
}
.brand-tag {
  display: block; margin-top: 0.4rem; color: var(--muted);
  font-size: 0.86rem; line-height: 1.35;
}

.nav { display: flex; flex-direction: column; gap: 0.25rem; }
.nav a {
  display: block; padding: 0.55rem 0.7rem; border-radius: 8px;
  color: var(--muted); text-decoration: none; font-weight: 500; font-size: 0.95rem;
  border: 1px solid transparent;
  transition: color .15s, background .15s, border-color .15s;
}
.nav a:hover { color: var(--ink); background: rgba(45, 212, 191, 0.08); }
.nav a.active {
  color: var(--ink);
  background: rgba(45, 212, 191, 0.12);
  border-color: rgba(45, 212, 191, 0.28);
}

.sidebar-foot {
  margin-top: 2rem; padding-top: 1rem; border-top: 1px solid var(--line);
  font-size: 0.8rem; color: var(--dim);
}
.sidebar-foot a { color: var(--teal); text-decoration: none; }
.sidebar-foot a:hover { text-decoration: underline; }

.content { padding: 2rem 2.25rem 3.5rem; }
article > :first-child { margin-top: 0; }
article h1 {
  font-size: clamp(1.7rem, 3vw, 2.2rem); letter-spacing: -0.035em;
  margin: 0 0 0.85rem; line-height: 1.2;
}
article h2 {
  margin: 2rem 0 0.7rem; font-size: 1.2rem; letter-spacing: -0.02em;
  padding-bottom: 0.35rem; border-bottom: 1px solid var(--line);
}
article h3 { margin: 1.35rem 0 0.45rem; font-size: 1.02rem; color: #dbe7f5; }
article p, article li { color: #c5d2e4; }
article a { color: var(--teal); }
article a:hover { color: #5eead4; }
article strong { color: #f1f6ff; font-weight: 600; }
article ul, article ol { padding-left: 1.2rem; }
article li + li { margin-top: 0.3rem; }

article table {
  width: 100%; border-collapse: collapse; margin: 1rem 0 1.4rem; font-size: 0.92rem;
  overflow: hidden; border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--panel);
}
article th, article td {
  text-align: left; padding: 0.7rem 0.85rem;
  border-bottom: 1px solid var(--line); vertical-align: top;
}
article th { color: var(--teal); font-weight: 600; background: rgba(45, 212, 191, 0.06); }
article tr:last-child td { border-bottom: 0; }

.codewrap { position: relative; margin: 1rem 0 1.35rem; }
article pre {
  margin: 0; padding: 1rem 1.1rem; overflow: auto; background: var(--code-bg);
  border: 1px solid var(--line); border-radius: var(--radius);
}
article pre code, article code { font-family: var(--mono); font-size: 0.84em; }
article :not(pre) > code {
  background: rgba(45, 212, 191, 0.1);
  border: 1px solid rgba(45, 212, 191, 0.18);
  padding: 0.1em 0.35em; border-radius: 5px; color: #99f6e4;
}
.copybtn {
  position: absolute; top: 0.55rem; right: 0.55rem;
  border: 1px solid var(--line); background: rgba(12, 28, 42, 0.9);
  color: var(--muted); font: 500 0.72rem/1 var(--font);
  letter-spacing: 0.04em; text-transform: uppercase;
  padding: 0.4rem 0.55rem; border-radius: 6px; cursor: pointer;
}
.copybtn:hover { color: var(--ink); border-color: rgba(45, 212, 191, 0.4); }
.copybtn.ok { color: var(--teal); }

.page-foot {
  margin-top: 2.5rem; padding-top: 1rem; border-top: 1px solid var(--line);
  color: var(--dim); font-size: 0.85rem;
}
.page-foot a { color: var(--teal); }

@media (max-width: 860px) {
  .shell { grid-template-columns: 1fr; }
  .sidebar {
    position: relative; height: auto; border-right: 0;
    border-bottom: 1px solid var(--line); padding-bottom: 1rem;
  }
  .nav { flex-direction: row; flex-wrap: wrap; gap: 0.35rem; }
  .nav a { padding: 0.45rem 0.65rem; font-size: 0.88rem; }
  .content { padding: 1.35rem 1.1rem 2.5rem; }
  .sidebar-foot { display: none; }
}