:root {
  --ground: #F6F4F0; --surface: #FFFFFF; --surface-2: #FBFAF8; --band: #EFECE5;
  --ink: #1A1D1B; --ink-2: #3E3B36; --muted: #5F5C56; --faint: #7A766E;
  --line: #E4E0D8; --line-2: #F0EDE7;
  --accent: #14594A; --accent-ink: #FFFFFF; --accent-soft: #E8F0ED; --accent-soft-ink: #1F5B45;
  --deep: #12211D; --deep-line: #27423A; --deep-ink: #E8EDEA; --deep-muted: #A9BAB3;
  --warn: #8A4A14; --warn-soft: #FAEEDF; --warn-line: #E8CFAF;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --ground: #0E1412; --surface: #151D1A; --surface-2: #121917; --band: #182220;
    --ink: #ECF1EE; --ink-2: #C9D6D1; --muted: #9DACA6; --faint: #8A9893;
    --line: #263330; --line-2: #1D2825;
    --accent: #56B394; --accent-ink: #08201A; --accent-soft: #16302A; --accent-soft-ink: #8FD6BB;
    --deep: #0A100E; --deep-line: #24332E;
    --warn: #E0A465; --warn-soft: #2C2114; --warn-line: #40301C;
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --ground: #0E1412; --surface: #151D1A; --surface-2: #121917; --band: #182220;
  --ink: #ECF1EE; --ink-2: #C9D6D1; --muted: #9DACA6; --faint: #8A9893;
  --line: #263330; --line-2: #1D2825;
  --accent: #56B394; --accent-ink: #08201A; --accent-soft: #16302A; --accent-soft-ink: #8FD6BB;
  --deep: #0A100E; --deep-line: #24332E;
  --warn: #E0A465; --warn-soft: #2C2114; --warn-line: #40301C;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: var(--ground); color: var(--ink);
  font-family: "IBM Plex Sans", system-ui, -apple-system, sans-serif;
  font-size: 16px; line-height: 1.65; -webkit-font-smoothing: antialiased;
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
h1, h2, h3 { font-family: Newsreader, Georgia, serif; font-weight: 600; letter-spacing: -0.015em; text-wrap: balance; margin: 0; }
p, li { text-wrap: pretty; }
p { margin: 0 0 14px; }
a { color: var(--accent); }
a:hover { text-decoration: none; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }

.wrap { width: 100%; max-width: 820px; margin: 0 auto; padding-inline: 20px; }
.mono { font-family: "IBM Plex Mono", ui-monospace, monospace; font-variant-numeric: tabular-nums; }

.site-header { background: var(--surface); border-bottom: 1px solid var(--line); }
.header-in { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 66px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; }
.mark { width: 32px; height: 32px; border-radius: 9px; background: var(--accent); display: grid; place-items: center; flex: none; }
.mark svg { stroke: var(--accent-ink); }
.brand-name { font-family: Newsreader, Georgia, serif; font-size: 21px; font-weight: 600; }
.header-in nav { display: flex; gap: 20px; font-size: 14.5px; }

.hero { padding-block: clamp(36px, 6vw, 60px) 24px; }
.hero h1 { font-size: clamp(30px, 4.6vw, 42px); line-height: 1.12; }
.eyebrow { font-size: 12px; letter-spacing: .12em; text-transform: uppercase; color: var(--muted); display: block; margin-bottom: 12px; }
.meta { margin-top: 16px; font-size: 14px; color: var(--muted); display: flex; flex-wrap: wrap; gap: 6px 22px; }

.pend { background: var(--warn-soft); border: 1px solid var(--warn-line); border-radius: 10px; padding: 16px 18px; margin-block: 24px; font-size: 14.5px; color: var(--ink-2); }
.pend strong { color: var(--warn); }
.pend code { font-family: "IBM Plex Mono", monospace; font-size: 13px; background: color-mix(in srgb, var(--warn) 12%, transparent); padding: 1px 5px; border-radius: 4px; }

.toc { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 20px 22px; margin-bottom: 40px; }
.toc h2 { font-family: "IBM Plex Sans", sans-serif; font-size: 13px; letter-spacing: .1em; text-transform: uppercase; color: var(--muted); font-weight: 500; margin-bottom: 12px; }
.toc ol { margin: 0; padding-left: 22px; columns: 2; column-gap: 32px; font-size: 14.5px; }
.toc li { margin-bottom: 6px; break-inside: avoid; }
.toc a { color: var(--ink-2); text-decoration: none; }
.toc a:hover { color: var(--accent); text-decoration: underline; }
@media (max-width: 640px) { .toc ol { columns: 1; } }

main.doc { padding-bottom: 60px; }
section.art { margin-bottom: 40px; scroll-margin-top: 20px; }
section.art h2 { font-size: clamp(21px, 2.6vw, 26px); line-height: 1.25; margin-bottom: 14px; padding-bottom: 10px; border-bottom: 1px solid var(--line); }
section.art h3 { font-family: "IBM Plex Sans", sans-serif; font-size: 16px; letter-spacing: 0; margin: 24px 0 8px; }
section.art ul, section.art ol { margin: 0 0 14px; padding-left: 22px; }
section.art li { margin-bottom: 8px; }
.num { color: var(--faint); font-family: "IBM Plex Mono", monospace; font-size: .78em; margin-right: 10px; }

table { width: 100%; border-collapse: collapse; margin: 16px 0 20px; font-size: 14.5px; }
caption { text-align: left; font-size: 13px; color: var(--muted); margin-bottom: 8px; }
th, td { text-align: left; vertical-align: top; padding: 10px 12px; border-bottom: 1px solid var(--line); }
th { font-weight: 600; font-size: 13px; letter-spacing: .04em; text-transform: uppercase; color: var(--muted); background: var(--surface-2); }
.tbl-wrap { overflow-x: auto; }

.callout { background: var(--surface); border: 1px solid var(--line); border-left: 3px solid var(--accent); border-radius: 0 10px 10px 0; padding: 16px 18px; margin: 18px 0; font-size: 15px; }
.callout p:last-child { margin-bottom: 0; }

.site-footer { background: var(--deep); color: var(--deep-muted); padding-block: 32px; font-size: 13.5px; }
.foot { display: flex; flex-wrap: wrap; gap: 14px 28px; justify-content: space-between; align-items: center; }
.site-footer a { color: var(--deep-muted); }
.site-footer a:hover { color: #FFFFFF; }
.site-footer .brand { color: #FFFFFF; }
.foot-links { display: flex; flex-wrap: wrap; gap: 8px 20px; }