@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;500;600;700&family=IBM+Plex+Sans:wght@400;500;600&display=swap');

:root {
  --paper: #f6f5f1;
  --ink: #17171a;
  --muted: #6e6e73;
  --line: #e2e0d9;
  --line-strong: #cfccc2;
  --accent: #2f5cff;
  --accent-tint: #ebefff;
  --warn: #9a6a12;
  --warn-tint: #f9f1de;
  --code-bg: #efeee8;
  --term-bg: #1b1b1f;
  --sidebar-w: 248px;
  --max: 720px;
  --mono: "IBM Plex Mono", ui-monospace, Consolas, monospace;
  --sans: "IBM Plex Sans", sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 24px; }

body {
  margin: 0;
  font-family: var(--sans);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.65;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 2px; }

.ic { width: 1em; height: 1em; stroke: currentColor; fill: none; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; vertical-align: -0.13em; flex-shrink: 0; }

/* Layout */
.wrap { display: flex; min-height: 100vh; }

.sidebar {
  width: var(--sidebar-w);
  flex-shrink: 0;
  border-right: 1px solid var(--line);
  padding: 36px 28px;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
}
.sidebar .brand { font-family: var(--mono); font-weight: 700; font-size: 19px; letter-spacing: 0.04em; }
.sidebar .tag { font-family: var(--mono); color: var(--muted); font-size: 12px; margin: 2px 0 28px; }

.sidebar nav a {
  display: block;
  color: var(--ink);
  padding: 5px 0;
  font-size: 14px;
}
.sidebar nav a:hover { color: var(--accent); text-decoration: none; }
.sidebar nav .group {
  font-family: var(--mono);
  color: var(--muted);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin: 22px 0 6px;
}

main { flex: 1; padding: 60px 56px; max-width: calc(var(--max) + 112px); }

/* Typography */
h1 { font-family: var(--mono); font-weight: 600; font-size: 36px; letter-spacing: -0.01em; margin: 0 0 10px; }
h2 {
  font-family: var(--mono);
  font-weight: 600;
  font-size: 21px;
  margin: 52px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
}
h3 { font-family: var(--mono); font-weight: 600; font-size: 15px; margin: 26px 0 8px; }
p { margin: 0 0 14px; }
.lead { font-size: 18px; color: var(--muted); margin-bottom: 8px; max-width: 56ch; }

ul, ol { margin: 0 0 14px; padding-left: 22px; }
li { margin: 5px 0; }

/* unmarked checklist */
ul.check { list-style: none; padding-left: 0; }
ul.check li { display: flex; gap: 10px; align-items: flex-start; }
ul.check li .ic { color: var(--accent); margin-top: 5px; font-size: 15px; }

hr { border: none; border-top: 1px solid var(--line); margin: 44px 0; }

/* Code */
code {
  font-family: var(--mono);
  font-size: 0.85em;
  background: var(--code-bg);
  padding: 2px 6px;
  border-radius: 4px;
}
pre {
  background: var(--code-bg);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 15px 18px;
  overflow-x: auto;
  margin: 0 0 14px;
}
pre code { background: none; padding: 0; font-size: 13px; line-height: 1.6; }

/* Table */
table { border-collapse: collapse; width: 100%; margin: 0 0 16px; font-size: 14.5px; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--line); }
th { font-family: var(--mono); font-weight: 600; font-size: 12px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--muted); }
td code { font-size: 0.84em; }

/* Steps */
.step { display: flex; gap: 16px; margin: 22px 0; }
.step .num {
  flex-shrink: 0;
  width: 30px; height: 30px;
  border: 1px solid var(--line-strong);
  border-radius: 6px;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--mono); font-weight: 600; font-size: 14px;
}
.step .body { flex: 1; min-width: 0; }
.step .body > h3:first-child { margin-top: 4px; }

/* Notes */
.note {
  display: flex; gap: 11px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  background: var(--accent-tint);
  padding: 12px 15px;
  border-radius: 0 6px 6px 0;
  margin: 0 0 16px;
  font-size: 14.5px;
}
.note .ic { color: var(--accent); margin-top: 3px; font-size: 17px; }
.note.warn { border-left-color: var(--warn); background: var(--warn-tint); }
.note.warn .ic { color: var(--warn); }

/* Figures */
figure { margin: 0 0 18px; }
figcaption { color: var(--muted); font-size: 13px; margin-top: 9px; }

/* Screenshot */
.shot { background: var(--term-bg); border: 1px solid var(--line-strong); border-radius: 8px; overflow: hidden; }
.shot .bar {
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.04em;
  color: #9a9aa3; background: #131316;
  padding: 8px 14px; border-bottom: 1px solid #2a2a30;
  display: flex; align-items: center; gap: 8px;
}
.shot .bar .ic { font-size: 13px; }
.shot .frame { padding: 18px; text-align: center; }
.shot img { max-width: 100%; height: auto; border-radius: 3px; }

/* Terminal */
.terminal { background: var(--term-bg); border: 1px solid var(--line-strong); border-radius: 8px; overflow: hidden; }
.terminal .bar {
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.04em;
  color: #9a9aa3; background: #131316;
  padding: 8px 14px; border-bottom: 1px solid #2a2a30;
  display: flex; align-items: center; gap: 8px;
}
.terminal .bar .ic { font-size: 13px; }
.terminal .out { font-family: var(--mono); font-size: 13px; color: #e4e4e7; padding: 16px 18px; line-height: 1.7; }
.terminal .prompt { color: #5ee08a; }
.terminal .dim { color: #8a8a93; }
.terminal .hl { color: #82a4ff; }

/* Flow diagram */
.flow { display: flex; align-items: stretch; flex-wrap: wrap; gap: 0; margin: 4px 0 16px; }
.flow .box {
  border: 1px solid var(--line-strong);
  border-radius: 6px;
  padding: 11px 16px;
  background: #fff;
  display: flex; flex-direction: column; justify-content: center;
}
.flow .box b { font-family: var(--mono); font-size: 13px; font-weight: 600; }
.flow .box span { color: var(--muted); font-size: 11.5px; }
.flow .arrow { display: flex; align-items: center; color: var(--line-strong); padding: 0 10px; }
.flow .arrow .ic { font-size: 20px; }

footer {
  margin-top: 68px; padding-top: 22px;
  border-top: 1px solid var(--line);
  color: var(--muted); font-size: 13px; font-family: var(--mono);
}

/* Responsive */
@media (max-width: 860px) {
  .sidebar { display: none; }
  main { padding: 34px 22px; }
  .flow { flex-direction: column; align-items: stretch; }
  .flow .arrow { padding: 6px 0; justify-content: center; transform: rotate(90deg); }
}