/* Okx Review · S01 · independent publisher. Not an OKX product skin. */
@import url("https://fonts.googleapis.com/css2?family=Source+Sans+3:ital,wght@0,400;0,500;0,600;0,700;1,400&family=Source+Serif+4:ital,opsz,wght@0,8..60,400;0,8..60,500;0,8..60,600;0,8..60,700;1,8..60,400;1,8..60,600&display=swap");

:root {
  --ink: #1f1a14;
  --ink-2: #3a3228;
  --paper: #f7f2e8;
  --paper-2: #efe7d6;
  --paper-3: #e6dcc8;
  --rule: #c9bda8;
  --rule-2: #b7aa93;
  --mute: #5c5448;
  --card: #fffaf1;
  --accent: #4a3a28;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Source Serif 4", "Iowan Old Style", Palatino, Georgia, serif;
  font-size: 1.125rem;
  line-height: 1.7;
}

a { color: var(--ink-2); text-underline-offset: 0.14em; }
a:hover { color: var(--ink); }

/* Masthead: split OKX + bold Review; aside on the right */
.mast { border-bottom: 3px double var(--ink); background: var(--paper-2); }
.mast-inner { max-width: 68rem; margin: 0 auto; padding: 0.85rem 1.5rem 0; }
.mast-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1.4rem;
  padding-bottom: 0.55rem;
}
.wordmark { text-decoration: none; color: var(--ink); line-height: 1; }
.wordmark .okx {
  font-weight: 400;
  font-size: 1.55rem;
  letter-spacing: 0.06em;
  font-family: "Source Serif 4", Palatino, Georgia, serif;
}
.wordmark .review {
  font-weight: 700;
  font-size: 1.85rem;
  letter-spacing: -0.03em;
  margin-left: 0.18em;
  font-family: "Source Serif 4", Palatino, Georgia, serif;
}
.mast-aside {
  font-family: "Source Sans 3", "Segoe UI", sans-serif;
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--mute);
  text-align: right;
  max-width: 14rem;
}
.mast-nav {
  display: flex;
  gap: 1.5rem;
  list-style: none;
  margin: 0;
  padding: 0.55rem 0 0.7rem;
  border-top: 1px solid var(--rule);
  font-family: "Source Sans 3", "Segoe UI", sans-serif;
  font-size: 0.76rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-weight: 500;
}
.mast-nav a {
  color: var(--ink);
  text-decoration: none;
  padding-bottom: 0.15rem;
  border-bottom: 2px solid transparent;
}
.mast-nav a:hover, .mast-nav a.is-here { border-bottom-color: var(--ink); }

.wrap {
  display: grid;
  grid-template-columns: minmax(0, 44rem) 14.5rem;
  gap: 3rem;
  max-width: 68rem;
  margin: 0 auto;
  padding: 2.2rem 1.5rem 5rem;
}
.toc {
  position: sticky;
  top: 1.3rem;
  align-self: start;
  font-family: "Source Sans 3", "Segoe UI", sans-serif;
  font-size: 0.8rem;
  line-height: 1.5;
  color: var(--mute);
}
.toc h2 {
  font-size: 0.66rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  margin: 0 0 0.65rem;
  color: var(--ink);
  font-weight: 600;
  font-family: inherit;
}
.toc ol { margin: 0; padding: 0; list-style: none; border-left: 1px solid var(--rule); }
.toc a {
  display: block;
  color: var(--mute);
  text-decoration: none;
  padding: 0.28rem 0 0.28rem 0.85rem;
  border-left: 2px solid transparent;
  margin-left: -1px;
}
.toc a:hover, .toc a.is-read { color: var(--ink); border-left-color: var(--ink); }

h1, h2, h3 {
  font-family: "Source Serif 4", Palatino, Georgia, serif;
  line-height: 1.22;
  letter-spacing: -0.02em;
  color: var(--ink);
}
h1 { font-size: clamp(1.8rem, 4vw, 2.5rem); margin: 0 0 0.8rem; font-weight: 500; }
h1 .rev { font-weight: 700; }
h2 { font-size: 1.38rem; margin: 2.3rem 0 0.6rem; font-weight: 650; }
h3 { font-size: 1.08rem; margin: 1.5rem 0 0.4rem; font-weight: 600; }
p { margin: 0 0 1rem; }

.kicker {
  font-family: "Source Sans 3", "Segoe UI", sans-serif;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 0.55rem;
  font-weight: 600;
}
.kicker b { font-weight: 700; }
.dateline {
  font-family: "Source Sans 3", "Segoe UI", sans-serif;
  font-size: 0.76rem;
  color: var(--mute);
  margin: 0 0 0.85rem;
  letter-spacing: 0.02em;
}
.lede {
  font-size: 1.2rem;
  line-height: 1.55;
  color: var(--ink-2);
  border-left: 3px solid var(--ink);
  padding: 0.05rem 0 0.05rem 1.05rem;
  margin: 0 0 1.35rem;
}
.byline {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.85rem;
  font-family: "Source Sans 3", "Segoe UI", sans-serif;
  font-size: 0.82rem;
  color: var(--mute);
  padding: 0.8rem 0 1.05rem;
  margin: 0 0 1.45rem;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}
.byline strong { color: var(--ink); font-weight: 600; }
.byline a { color: var(--ink); }

.who {
  display: grid;
  grid-template-columns: 58px 1fr;
  gap: 0.95rem;
  background: var(--card);
  border: 1px solid var(--rule);
  padding: 1rem 1.1rem;
  margin: 0 0 1.7rem;
  font-size: 0.98rem;
}
.mono {
  width: 58px; height: 58px;
  background: var(--ink); color: var(--paper);
  display: grid; place-items: center;
  font-family: "Source Sans 3", sans-serif;
  font-size: 0.95rem; letter-spacing: 0.06em; font-weight: 600;
}
.who p { margin: 0.22rem 0 0; color: var(--ink-2); }
.who strong { display: block; }

.sources {
  background: var(--card);
  border: 1px solid var(--rule);
  padding: 1.05rem 1.1rem 1.15rem;
  margin: 0 0 1.8rem;
}
.sources h2 {
  font-family: "Source Sans 3", "Segoe UI", sans-serif;
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin: 0 0 0.5rem;
  font-weight: 650;
}
.sources .lead {
  font-family: "Source Sans 3", "Segoe UI", sans-serif;
  font-size: 0.84rem;
  color: var(--mute);
  margin: 0 0 0.7rem;
}
.sources table { margin: 0; }

.exit { display: flex; gap: 0.7rem; flex-wrap: wrap; margin: 0.35rem 0 1.6rem; }
.exit a {
  font-family: "Source Sans 3", "Segoe UI", sans-serif;
  font-size: 0.84rem;
  color: var(--paper);
  background: var(--ink);
  text-decoration: none;
  padding: 0.55rem 0.95rem;
  border: 1px solid var(--ink);
}
.exit a.ghost { background: transparent; color: var(--ink); border-color: var(--rule-2); }

.pull {
  margin: 1.5rem 0;
  padding: 0.15rem 0 0.15rem 1.1rem;
  border-left: 3px solid var(--ink);
  font-size: 1.16rem;
  line-height: 1.45;
  font-style: italic;
}
.quote {
  margin: 1.15rem 0 1.4rem;
  padding: 0.9rem 1.1rem;
  background: var(--card);
  border: 1px solid var(--rule);
  font-size: 1rem;
}
.quote p { margin: 0; }
.quote cite {
  display: block;
  margin-top: 0.55rem;
  font-family: "Source Sans 3", "Segoe UI", sans-serif;
  font-size: 0.76rem;
  font-style: normal;
  color: var(--mute);
}
.note {
  background: var(--paper-2);
  border: 1px solid var(--rule);
  padding: 0.9rem 1.05rem;
  font-size: 0.96rem;
  margin: 1.1rem 0 1.35rem;
}

.table-wrap { overflow-x: auto; margin: 0.55rem 0 1.25rem; }
table {
  width: 100%;
  border-collapse: collapse;
  font-family: "Source Sans 3", "Segoe UI", sans-serif;
  font-size: 0.86rem;
  line-height: 1.4;
  background: var(--card);
}
caption {
  caption-side: bottom;
  text-align: left;
  font-size: 0.74rem;
  color: var(--mute);
  padding: 0.45rem 0 0.2rem;
}
th, td { border: 1px solid var(--rule); text-align: left; padding: 0.5rem 0.62rem; vertical-align: top; }
th { background: var(--paper-2); font-weight: 600; }
.ph { color: var(--mute); font-style: italic; }
td a { word-break: break-word; }

.faq dt { font-weight: 650; margin: 1.05rem 0 0.22rem; }
.faq dd { margin: 0 0 0.15rem; color: var(--ink-2); }

.related { margin: 2.4rem 0 0; padding-top: 1.15rem; border-top: 1px solid var(--rule); }
.related h2 {
  font-family: "Source Sans 3", "Segoe UI", sans-serif;
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin: 0 0 0.8rem;
}
.related ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.6rem; }
.related a {
  display: block;
  text-decoration: none;
  background: var(--card);
  border: 1px solid var(--rule);
  padding: 0.7rem 0.85rem;
}
.related a strong {
  display: block;
  font-family: "Source Serif 4", Palatino, Georgia, serif;
  font-size: 1.02rem;
  color: var(--ink);
}
.related a span {
  display: block;
  font-family: "Source Sans 3", "Segoe UI", sans-serif;
  font-size: 0.8rem;
  color: var(--mute);
  margin-top: 0.12rem;
}

.foot {
  border-top: 3px double var(--ink);
  background: var(--paper-2);
  padding: 1.7rem 1.5rem 2.6rem;
  font-family: "Source Sans 3", "Segoe UI", sans-serif;
  font-size: 0.8rem;
  line-height: 1.55;
  color: var(--mute);
}
.foot-inner { max-width: 68rem; margin: 0 auto; }
.colophon {
  font-family: "Source Serif 4", Palatino, Georgia, serif;
  font-size: 1.05rem;
  color: var(--ink);
  margin: 0 0 0.5rem;
}
.foot nav { margin: 0.6rem 0; }
.foot a { color: var(--ink); }
.legal { margin: 0.85rem 0 0; max-width: 44rem; }

@media (max-width: 900px) {
  .wrap { grid-template-columns: 1fr; gap: 2rem; padding-top: 1.5rem; }
  .toc { position: static; }
  .mast-row { flex-direction: column; align-items: flex-start; }
  .mast-aside { text-align: left; }
  .mast-nav { flex-wrap: wrap; gap: 0.75rem 1.15rem; }
}