/* ==========================================================================
   FLUXATH — "The Dispatch"
   A trade field-manual / control-room editorial system. Warm paper, ink type,
   one electric signal (FLUXATH cyan). Fraunces (display) · Hanken Grotesk (body)
   · Spline Sans Mono (labels & data). Light, no-JS, mobile-first, WCAG AA.
   ========================================================================== */

:root {
  /* Surfaces */
  --paper: #faf8f3;          /* warm off-white page */
  --surface: #ffffff;
  --surface-2: #f4f1e8;      /* sunk panel */
  --ink: #16130d;            /* primary text — 15.7:1 on paper */
  --ink-2: #4a443a;          /* secondary — 7.9:1 */
  --ink-3: #756b5b;          /* muted — 4.7:1 (AA for body) */
  --rule: #e4dfd2;           /* hairline */
  --rule-2: #d3ccba;

  /* Signal — FLUXATH cyan. Bright is DECORATIVE only (rules/ticks/marks).
     Text uses the AA-safe deep teal. */
  --signal: #00e5ff;         /* decorative bright cyan */
  --signal-ink: #0a6c79;     /* AA text/link cyan-teal — 4.9:1 on paper */
  --signal-deep: #07505a;
  --amber: #9c4a06;          /* objections / cautions — 5.6:1 */
  --ok: #2f6f37;

  /* Inverted (CTA bands, footer) */
  --night: #14110b;
  --night-2: #1d1912;
  --night-rule: #322b1f;
  --night-ink: #f1ece0;
  --night-ink-2: #b8b0a0;

  --maxw: 74rem;
  --measure: 68ch;
  --radius: 4px;

  --sans: "Hanken Grotesk", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --serif: "Fraunces", "Hoefler Text", Georgia, "Times New Roman", serif;
  --mono: "Spline Sans Mono", ui-monospace, "SF Mono", "Cascadia Code", Menlo, monospace;

  --shadow: 0 1px 0 var(--rule), 0 2px 14px -10px rgba(20, 17, 11, 0.22);
}

/* ------------------------------------------------------------------ reset */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } * { animation-duration: .001ms !important; transition-duration: .001ms !important; } }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.65;
  font-feature-settings: "kern", "liga", "calt";
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}
img, svg, video { max-width: 100%; height: auto; display: block; }
a { color: var(--ink); text-decoration: none; }
hr { border: 0; border-top: 1px solid var(--rule); margin: 2.5rem 0; }

/* ------------------------------------------------------------------ type */
h1, h2, h3, h4 { font-family: var(--serif); font-weight: 460; line-height: 1.06; letter-spacing: -0.012em; color: var(--ink); margin: 0 0 .5em; font-optical-sizing: auto; }
h1 { font-size: clamp(2.3rem, 1.4rem + 4.1vw, 4.1rem); font-weight: 480; letter-spacing: -0.02em; }
h2 { font-size: clamp(1.6rem, 1.2rem + 1.7vw, 2.3rem); margin-top: 2.2em; }
h3 { font-size: clamp(1.22rem, 1.05rem + 0.7vw, 1.5rem); margin-top: 1.8em; }
h4 { font-size: 1.08rem; font-family: var(--sans); font-weight: 700; letter-spacing: 0; }
p { margin: 0 0 1.15rem; }
strong, b { font-weight: 680; }
small { font-size: .8125rem; color: var(--ink-3); }

/* ------------------------------------------------------------- dispatch kicker */
.kicker {
  font-family: var(--mono);
  font-size: .72rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--ink-2);
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  margin: 0 0 1rem;
}
.kicker::before {
  content: "";
  width: .55rem; height: .9rem;
  background: var(--signal);
  box-shadow: 0 0 0 1px rgba(7, 80, 90, .25);
  flex: none;
}
.kicker .idx { color: var(--signal-ink); font-weight: 600; }

/* ------------------------------------------------------------------ layout */
.shell { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 clamp(1.1rem, 4vw, 2.5rem); }
.skip { position: absolute; left: -999px; top: 0; background: var(--ink); color: var(--paper); padding: .6rem 1rem; z-index: 100; }
.skip:focus { left: .5rem; top: .5rem; }

:where(a, button, input, summary):focus-visible {
  outline: 2px solid var(--signal-ink);
  outline-offset: 2px;
  border-radius: 2px;
}

/* ------------------------------------------------------------------ masthead */
.masthead { border-bottom: 1px solid var(--rule); background: color-mix(in srgb, var(--paper) 86%, transparent); backdrop-filter: saturate(1.1) blur(6px); position: sticky; top: 0; z-index: 40; }
.masthead__row { display: flex; align-items: center; justify-content: space-between; gap: 1rem; min-height: 4rem; }
.wordmark { display: inline-flex; align-items: baseline; gap: .5rem; }
.wordmark__name { font-family: var(--serif); font-weight: 520; font-size: 1.34rem; letter-spacing: -0.01em; }
.wordmark__pub { font-family: var(--mono); font-size: .64rem; letter-spacing: .22em; text-transform: uppercase; color: var(--ink-3); border-left: 1px solid var(--rule-2); padding-left: .5rem; }
.nav { display: flex; align-items: center; gap: 1.4rem; }
.nav a { font-size: .92rem; color: var(--ink-2); position: relative; padding: .2rem 0; }
.nav a:hover { color: var(--ink); }
.nav a:hover::after { content: ""; position: absolute; left: 0; right: 0; bottom: -2px; height: 2px; background: var(--signal); }
.nav__cta { font-family: var(--mono); font-size: .76rem; letter-spacing: .04em; text-transform: uppercase; border: 1px solid var(--ink); padding: .5rem .8rem; color: var(--ink); }
.nav__cta:hover { background: var(--ink); color: var(--paper); }
.nav__cta::after { display: none !important; }
@media (max-width: 720px) {
  .nav { gap: .9rem; }
  .nav a:not(.nav__cta) { display: none; }
  .wordmark__pub { display: none; }
}

/* ------------------------------------------------------------------ hero */
.hero { padding: clamp(2.5rem, 5vw, 4.5rem) 0 clamp(2rem, 4vw, 3.2rem); border-bottom: 1px solid var(--rule); }
.hero__grid { display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 4fr); gap: clamp(1.5rem, 4vw, 3.2rem); align-items: end; }
.hero__lede { font-size: clamp(1.05rem, 1rem + .5vw, 1.3rem); color: var(--ink-2); max-width: 42ch; margin-top: 1.2rem; }
@media (max-width: 860px) { .hero__grid { grid-template-columns: 1fr; gap: 1.6rem; align-items: start; } }

/* dispatch card — the asymmetric right rail */
.dispatch-card { border: 1px solid var(--ink); background: var(--surface); padding: 1.1rem 1.2rem 1.25rem; box-shadow: var(--shadow); }
.dispatch-card dl { display: grid; grid-template-columns: auto 1fr; gap: .45rem 1rem; margin: 0; font-family: var(--mono); font-size: .8rem; }
.dispatch-card dt { color: var(--ink-3); text-transform: uppercase; letter-spacing: .08em; font-size: .68rem; align-self: center; }
.dispatch-card dd { margin: 0; color: var(--ink); }
.dispatch-card__cta { display: block; margin-top: 1rem; text-align: center; background: var(--ink); color: var(--paper); font-family: var(--mono); text-transform: uppercase; letter-spacing: .06em; font-size: .78rem; padding: .7rem; }
.dispatch-card__cta:hover { background: var(--signal-deep); }

/* ------------------------------------------------------------- article body */
.layout { display: grid; grid-template-columns: minmax(0, 1fr); gap: 0; padding: clamp(2rem, 4vw, 3rem) 0 1rem; }
.article { max-width: var(--measure); }
.article--spined {
  border-left: 1px solid var(--rule-2);
  padding-left: clamp(1.1rem, 3vw, 2.2rem);
  margin-left: 2px;
}
.article > * { max-width: var(--measure); }
.article p, .article li { color: var(--ink); }
.article li { margin: .35rem 0; }
.article ul, .article ol { padding-left: 1.2rem; margin: 0 0 1.2rem; }
.article ul { list-style: none; }
.article ul > li { position: relative; padding-left: 1.1rem; }
.article ul > li::before { content: ""; position: absolute; left: 0; top: .72em; width: .42rem; height: 1px; background: var(--signal-ink); }
.article a:not(.btn):not(.cta-band a) { color: var(--ink); box-shadow: inset 0 -2px 0 var(--signal); transition: background .15s, box-shadow .15s; padding-bottom: 1px; }
.article a:not(.btn):not(.cta-band a):hover { background: color-mix(in srgb, var(--signal) 18%, transparent); box-shadow: inset 0 -2px 0 var(--signal-deep); }
.article h2 { scroll-margin-top: 5rem; }
.article h3 { scroll-margin-top: 5rem; }
.article h2 .header-anchor, .article h3 .header-anchor { color: var(--ink-3); text-decoration: none; box-shadow: none; opacity: 0; padding-left: .3rem; }
.article h2:hover .header-anchor, .article h3:hover .header-anchor { opacity: 1; }
.article blockquote { margin: 1.6rem 0; padding: .2rem 0 .2rem 1.2rem; border-left: 3px solid var(--signal); font-family: var(--serif); font-size: 1.22rem; line-height: 1.4; color: var(--ink); font-weight: 420; }
.article blockquote p:last-child { margin-bottom: 0; }
.article code { font-family: var(--mono); font-size: .86em; background: var(--surface-2); padding: .1em .35em; border-radius: 3px; border: 1px solid var(--rule); }
.article pre { background: var(--night); color: var(--night-ink); padding: 1rem 1.1rem; overflow-x: auto; border-radius: var(--radius); font-family: var(--mono); font-size: .84rem; line-height: 1.5; }
.article pre code { background: none; border: 0; padding: 0; color: inherit; }

/* tables — trade-doc styling */
.article table, .data-table { width: 100%; max-width: var(--measure); border-collapse: collapse; margin: 1.6rem 0; font-size: .94rem; }
.article th, .article td, .data-table th, .data-table td { text-align: left; padding: .6rem .8rem; border-bottom: 1px solid var(--rule); }
.article thead th, .data-table thead th { font-family: var(--mono); font-size: .72rem; text-transform: uppercase; letter-spacing: .08em; color: var(--ink-2); border-bottom: 2px solid var(--ink); }
.article tbody tr:hover, .data-table tbody tr:hover { background: var(--surface-2); }

/* ------------------------------------------------------------- readouts (stats) */
.readouts { display: grid; grid-template-columns: repeat(auto-fit, minmax(8.5rem, 1fr)); gap: 0; border: 1px solid var(--ink); margin: 1.8rem 0; background: var(--surface); }
.readout { padding: 1rem 1.1rem; border-right: 1px solid var(--rule); }
.readout:last-child { border-right: 0; }
.readout__num { font-family: var(--serif); font-size: clamp(1.8rem, 1.4rem + 1.4vw, 2.6rem); font-weight: 500; line-height: 1; letter-spacing: -0.02em; }
.readout__num span { font-family: var(--mono); font-size: .9rem; color: var(--signal-ink); vertical-align: super; }
.readout__label { font-family: var(--mono); font-size: .68rem; text-transform: uppercase; letter-spacing: .09em; color: var(--ink-3); margin-top: .5rem; }
@media (max-width: 560px) { .readouts { grid-template-columns: 1fr 1fr; } .readout:nth-child(even) { border-right: 0; } .readout { border-bottom: 1px solid var(--rule); } }

/* ------------------------------------------------------------- callouts */
.callout { border: 1px solid var(--rule-2); border-left: 3px solid var(--signal-ink); background: var(--surface); padding: 1rem 1.2rem; margin: 1.6rem 0; border-radius: 0 var(--radius) var(--radius) 0; }
.callout__label { font-family: var(--mono); font-size: .7rem; text-transform: uppercase; letter-spacing: .1em; color: var(--signal-ink); margin-bottom: .4rem; }
.callout p:last-child { margin-bottom: 0; }
.callout--objection { border-left-color: var(--amber); }
.callout--objection .callout__label { color: var(--amber); }
.callout--data { border-left-color: var(--ink); background: var(--surface-2); }
.callout--data .callout__label { color: var(--ink-2); }

/* ------------------------------------------------------------- crumbs / meta */
.crumbs { font-family: var(--mono); font-size: .74rem; color: var(--ink-3); margin: 0 0 1.4rem; letter-spacing: .02em; display: flex; flex-wrap: wrap; gap: .35rem; }
.crumbs a { color: var(--ink-2); box-shadow: inset 0 -1px 0 var(--rule-2); }
.crumbs a:hover { color: var(--signal-ink); }
.crumbs .sep { color: var(--rule-2); }
.meta-line { font-family: var(--mono); font-size: .76rem; color: var(--ink-3); display: flex; flex-wrap: wrap; gap: 1rem; margin: 1.1rem 0 0; }
.meta-line .dot { color: var(--signal-ink); }

/* ------------------------------------------------------------- TOC */
.toc { border: 1px solid var(--rule); background: var(--surface-2); padding: 1rem 1.2rem; margin: 0 0 2rem; border-radius: var(--radius); }
.toc__label { font-family: var(--mono); font-size: .68rem; text-transform: uppercase; letter-spacing: .12em; color: var(--ink-3); margin-bottom: .6rem; }
.toc ol { margin: 0; padding-left: 1.1rem; }
.toc li { margin: .3rem 0; font-size: .94rem; }
.toc a { color: var(--ink-2); }
.toc a:hover { color: var(--signal-ink); box-shadow: inset 0 -1px 0 var(--signal); }

/* ------------------------------------------------------------- FAQ */
.faq { margin: 2.5rem 0 1rem; }
.faq h2 { margin-bottom: 1rem; }
.faq details { border-top: 1px solid var(--rule); padding: .2rem 0; }
.faq details:last-child { border-bottom: 1px solid var(--rule); }
.faq summary { cursor: pointer; list-style: none; padding: 1rem 2rem 1rem 0; font-weight: 640; position: relative; font-size: 1.05rem; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; position: absolute; right: .2rem; top: 50%; transform: translateY(-50%); font-family: var(--mono); color: var(--signal-ink); font-size: 1.2rem; }
.faq details[open] summary::after { content: "–"; }
.faq details > div { padding: 0 0 1rem; color: var(--ink-2); }
.faq details > div p:last-child { margin-bottom: 0; }

/* ------------------------------------------------------------- CTA band */
.cta-band { background: var(--night); color: var(--night-ink); border-radius: var(--radius); padding: clamp(1.6rem, 3vw, 2.6rem); margin: 3rem 0; position: relative; overflow: hidden; }
.cta-band::before { content: ""; position: absolute; inset: 0; background: linear-gradient(120deg, transparent 60%, color-mix(in srgb, var(--signal) 14%, transparent)); pointer-events: none; }
.cta-band .kicker { color: var(--night-ink-2); }
.cta-band .kicker::before { background: var(--signal); }
.cta-band h2 { color: var(--night-ink); margin-top: .2rem; max-width: 22ch; }
.cta-band p { color: var(--night-ink-2); max-width: 50ch; }
.cta-actions { display: flex; flex-wrap: wrap; gap: .8rem; margin-top: 1.4rem; position: relative; }
.btn { font-family: var(--mono); font-size: .82rem; text-transform: uppercase; letter-spacing: .05em; padding: .8rem 1.3rem; border: 1px solid transparent; display: inline-flex; align-items: center; gap: .5rem; }
.btn--primary { background: var(--signal); color: var(--night); font-weight: 600; }
.btn--primary:hover { background: #5cf0ff; }
.btn--ghost { border-color: var(--night-rule); color: var(--night-ink); }
.btn--ghost:hover { border-color: var(--signal); color: var(--signal); }

/* ------------------------------------------------------------- related / cards */
.section-head { display: flex; align-items: baseline; justify-content: space-between; gap: 1rem; border-bottom: 2px solid var(--ink); padding-bottom: .6rem; margin: 3rem 0 1.4rem; }
.section-head h2 { margin: 0; font-size: clamp(1.3rem, 1.1rem + 1vw, 1.7rem); }
.section-head a { font-family: var(--mono); font-size: .76rem; text-transform: uppercase; letter-spacing: .05em; color: var(--signal-ink); white-space: nowrap; }
.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 17rem), 1fr)); gap: 1px; background: var(--rule); border: 1px solid var(--rule); }
.card { background: var(--surface); padding: 1.2rem 1.25rem 1.35rem; display: flex; flex-direction: column; gap: .55rem; min-height: 100%; transition: background .15s; }
.card:hover { background: var(--surface-2); }
.card__kicker { font-family: var(--mono); font-size: .66rem; text-transform: uppercase; letter-spacing: .1em; color: var(--signal-ink); }
.card__title { font-family: var(--serif); font-size: 1.16rem; line-height: 1.15; font-weight: 480; letter-spacing: -0.01em; }
.card__title a { box-shadow: none; }
.card:hover .card__title { color: var(--signal-deep); }
.card__excerpt { font-size: .9rem; color: var(--ink-2); margin: 0; }
.card__foot { margin-top: auto; font-family: var(--mono); font-size: .68rem; color: var(--ink-3); display: flex; gap: .8rem; padding-top: .4rem; }

/* tag pills */
.tags { display: flex; flex-wrap: wrap; gap: .4rem; margin: 1.2rem 0; }
.tag { font-family: var(--mono); font-size: .7rem; text-transform: uppercase; letter-spacing: .06em; color: var(--ink-2); border: 1px solid var(--rule-2); padding: .25rem .55rem; border-radius: 100px; }
.tag:hover { border-color: var(--signal-ink); color: var(--signal-ink); }

/* "part of guide" banner */
.in-cluster { border: 1px solid var(--rule-2); background: var(--surface); padding: .9rem 1.1rem; margin: 0 0 2rem; display: flex; align-items: center; gap: .8rem; font-size: .9rem; border-radius: var(--radius); flex-wrap: wrap; }
.in-cluster .lbl { font-family: var(--mono); font-size: .68rem; text-transform: uppercase; letter-spacing: .1em; color: var(--ink-3); }
.in-cluster a { font-weight: 620; box-shadow: inset 0 -2px 0 var(--signal); }

/* ------------------------------------------------------------- index / hubs */
.index-hero { padding: clamp(2.2rem, 4vw, 3.6rem) 0 1.5rem; border-bottom: 1px solid var(--rule); }
.index-hero p { color: var(--ink-2); max-width: 56ch; font-size: 1.1rem; }
.cluster-block { margin: 2.6rem 0; }
.letter-list { columns: 2; column-gap: 2.5rem; }
@media (max-width: 640px) { .letter-list { columns: 1; } }
.letter-list a { display: block; padding: .4rem 0; border-bottom: 1px solid var(--rule); box-shadow: none; break-inside: avoid; }
.letter-list a:hover { color: var(--signal-ink); }

/* ------------------------------------------------------------- footer */
.footer { background: var(--night); color: var(--night-ink-2); margin-top: 4rem; padding: 3rem 0 2.5rem; border-top: 3px solid var(--signal); }
.footer__grid { display: grid; grid-template-columns: 1.4fr repeat(3, 1fr); gap: 2rem; }
@media (max-width: 760px) { .footer__grid { grid-template-columns: 1fr 1fr; gap: 1.6rem; } }
.footer h3 { font-family: var(--mono); font-size: .72rem; text-transform: uppercase; letter-spacing: .12em; color: var(--night-ink); margin-bottom: .9rem; font-weight: 600; }
.footer a { color: var(--night-ink-2); display: block; padding: .25rem 0; font-size: .9rem; }
.footer a:hover { color: var(--signal); }
.footer__brand .wordmark__name { color: var(--night-ink); }
.footer__line { font-size: .86rem; line-height: 1.6; margin-top: .6rem; }
.footer__legal { border-top: 1px solid var(--night-rule); margin-top: 2.2rem; padding-top: 1.4rem; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 1rem; font-family: var(--mono); font-size: .72rem; color: var(--night-ink-2); }

/* ------------------------------------------------------------- utilities */
.lede { font-size: 1.2rem; color: var(--ink-2); line-height: 1.55; margin-bottom: 1.6rem; max-width: var(--measure); }
.eyebrow { font-family: var(--mono); font-size: .72rem; text-transform: uppercase; letter-spacing: .14em; color: var(--ink-3); }
.muted { color: var(--ink-3); }
.center { text-align: center; }
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.updated-flag { font-family: var(--mono); font-size: .68rem; color: var(--ok); text-transform: uppercase; letter-spacing: .08em; }

/* print */
@media print { .masthead, .footer, .cta-band, .dispatch-card__cta, .nav { display: none; } body { background: #fff; } .article { max-width: 100%; } }