:root {
  --paper: #f7fbfa;
  --teal: #1a8a7f;
  --ink: #0e3d3a;
  --copy: #24302f;
  --mist: #e4f3f0;
  --line: #c5ddd9;
  --card: 20px;
  --rail: 220px;
  --measure: 760px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--copy);
  font-family: "Iowan Old Style", "Palatino Linotype", "Songti SC", "STSong", "SimSun", serif;
  font-size: 17px;
  line-height: 1.8;
}

a {
  color: var(--teal);
  text-underline-offset: 3px;
}

a:hover {
  color: var(--ink);
}

.mast {
  background: #ffffff;
  border-bottom: 1px solid var(--line);
}

.mast-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  text-decoration: none;
  font-weight: 700;
  letter-spacing: 0.03em;
}

.brand svg {
  display: block;
  flex: 0 0 auto;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.site-nav a {
  text-decoration: none;
  color: var(--copy);
  padding: 6px 12px;
  border-radius: 999px;
}

.site-nav a.is-current {
  background: var(--mist);
  color: var(--ink);
  box-shadow: inset 0 0 0 1px var(--teal);
}

.shell {
  display: grid;
  grid-template-columns: var(--rail) minmax(0, 1fr);
  gap: 48px;
  max-width: 1100px;
  margin: 0 auto;
  padding: 28px 20px 72px;
}

.rail {
  position: sticky;
  top: 16px;
  align-self: start;
  width: 220px;
}

.toc-kicker {
  margin: 0 0 10px;
  color: var(--teal);
  font-size: 12px;
  letter-spacing: 0.14em;
}

.toc {
  margin: 0;
  padding: 0;
  list-style: none;
}

.toc a {
  display: block;
  text-decoration: none;
  color: var(--copy);
  border-left: 3px solid transparent;
  padding: 7px 8px 7px 12px;
  font-size: 14px;
  line-height: 1.4;
}

.toc a:hover {
  border-left-color: var(--teal);
  color: var(--ink);
  background: linear-gradient(90deg, var(--mist), transparent);
}

.toc a[href="#risk"] {
  border-left-color: var(--teal);
  color: var(--ink);
}

body:has(:target) .toc a[href="#risk"] {
  border-left-color: transparent;
  color: var(--copy);
}

body:has(#risk:target) .toc a[href="#risk"],
body:has(#capability:target) .toc a[href="#capability"],
body:has(#compare:target) .toc a[href="#compare"],
body:has(#chart:target) .toc a[href="#chart"],
body:has(#entry:target) .toc a[href="#entry"],
body:has(#faq:target) .toc a[href="#faq"],
body:has(#news:target) .toc a[href="#news"],
body:has(#primary:target) .toc a[href="#primary"],
body:has(#systems:target) .toc a[href="#systems"],
body:has(#steps:target) .toc a[href="#steps"],
body:has(#require:target) .toc a[href="#require"],
body:has(#server:target) .toc a[href="#server"],
body:has(#lang:target) .toc a[href="#lang"],
body:has(#quotes:target) .toc a[href="#quotes"],
body:has(#positions:target) .toc a[href="#positions"],
body:has(#alerts:target) .toc a[href="#alerts"],
body:has(#next:target) .toc a[href="#next"] {
  border-left-color: var(--teal);
  color: var(--ink);
  background: linear-gradient(90deg, var(--mist), transparent);
}

body:has(#primary:target) .toc a[href="#primary"],
body:has(#lang:target) .toc a[href="#lang"] {
  border-left-color: var(--teal);
}

.toc a[href="#primary"],
.toc a[href="#lang"] {
  border-left-color: var(--teal);
  color: var(--ink);
}

body:has(:target) .toc a[href="#primary"],
body:has(:target) .toc a[href="#lang"] {
  border-left-color: transparent;
  color: var(--copy);
}

body:has(#primary:target) .toc a[href="#primary"],
body:has(#lang:target) .toc a[href="#lang"] {
  border-left-color: var(--teal);
  color: var(--ink);
}

.folio {
  max-width: var(--measure);
}

.lede {
  margin: 0 0 28px;
  padding: 4px 0 24px;
  border-bottom: 1px solid var(--line);
}

.lede .eyebrow {
  margin: 0 0 8px;
  color: var(--teal);
  font-size: 13px;
  letter-spacing: 0.08em;
}

.lede h1 {
  margin: 0 0 14px;
  color: var(--ink);
  font-size: 1.82rem;
  line-height: 1.35;
}

.lede h1 + p::first-letter {
  float: left;
  padding-right: 8px;
  color: var(--ink);
  font-size: 2.55em;
  line-height: 0.85;
}

.lede p {
  margin: 0 0 14px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: var(--card);
  background: var(--teal);
  color: #ffffff;
  text-decoration: none;
  font-family: inherit;
}

.btn:hover {
  background: var(--ink);
  color: #ffffff;
}

.btn-line {
  background: transparent;
  color: var(--ink);
  box-shadow: inset 0 0 0 1px var(--teal);
}

.btn-line:hover {
  background: var(--mist);
  color: var(--ink);
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 16px 0;
}

.risk-band {
  margin: 0 0 28px;
  padding: 18px 22px;
  border-radius: var(--card);
  border-left: 5px solid var(--teal);
  background: #e8f5f3;
}

.card {
  margin: 0 0 28px;
  padding: 22px 24px;
  border-radius: var(--card);
  background: #ffffff;
  box-shadow: 0 1px 0 var(--line);
}

h2 {
  margin: 0 0 12px;
  color: var(--ink);
  font-size: 1.32rem;
  line-height: 1.4;
}

h3 {
  margin: 18px 0 8px;
  color: var(--ink);
  font-size: 1.05rem;
}

p {
  margin: 0 0 14px;
}

.note {
  color: #35504d;
  font-size: 0.96rem;
}

.terms {
  margin: 8px 0 0;
}

.terms dt {
  margin-top: 12px;
  color: var(--ink);
  font-weight: 700;
}

.terms dd {
  margin: 4px 0 0;
}

.grid-terms {
  display: grid;
  grid-template-columns: 7.2em 1fr;
  gap: 8px 16px;
  margin: 12px 0 0;
}

.grid-terms dt {
  margin: 0;
  color: var(--teal);
  font-weight: 700;
}

.grid-terms dd {
  margin: 0;
}

.pair-box {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 12px;
}

.pair-box > div {
  padding: 14px 16px;
  border-radius: var(--card);
  background: var(--mist);
}

.pair-box strong {
  display: block;
  color: var(--ink);
}

.faq details {
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
}

.faq summary {
  cursor: pointer;
  color: var(--ink);
  font-weight: 700;
}

.faq details p {
  margin: 8px 0 0;
}

.news-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.news-list li {
  padding: 12px 0;
  border-bottom: 1px dashed var(--line);
}

.news-list time {
  display: block;
  color: var(--teal);
  font-size: 13px;
}

.filename {
  display: inline-block;
  padding: 0 6px;
  border-radius: 6px;
  background: var(--mist);
  color: var(--ink);
  font-family: Consolas, "Courier New", monospace;
  font-size: 0.92em;
}

.colophon {
  padding: 36px 20px;
  background: var(--ink);
  color: #d7eeeb;
}

.colophon-inner {
  max-width: 1100px;
  margin: 0 auto;
}

.colophon p {
  margin: 0 0 12px;
}

.colophon p:last-child {
  margin: 0;
}

@media (max-width: 900px) {
  .mast-inner,
  .shell {
    display: block;
  }

  .rail {
    position: relative;
    top: auto;
    width: auto;
    margin-bottom: 22px;
  }

  .folio {
    max-width: none;
  }

  .grid-terms,
  .pair-box {
    grid-template-columns: 1fr;
  }
}