/* ==========================================================================
   Fusionex Ivan Teh - Design System
   Palette : Archive Ink / Warm Paper / Burnished Brass / Deep Jade
   Type    : Instrument Serif (display) - Newsreader (body) - IBM Plex Mono (index)
   Motif   : the "record rail" - an archival index column beside every section
   ========================================================================== */

:root {
  /* Colour */
  --ink:        #0E1B2A;
  --ink-2:      #16283C;
  --ink-3:      #22405C;
  --paper:      #FBFAF7;
  --paper-2:    #F2EFE9;
  --paper-3:    #E9E4D8;
  --slate:      #4C5C6B;
  --slate-lt:   #6B7B8A;
  --brass:      #9C7326;
  --brass-lt:   #C9A455;
  --brass-pale: #EFE3C8;
  --jade:       #1B564A;
  --rule:       #DEDACF;
  --rule-dark:  rgba(201, 164, 85, 0.24);

  /* Type */
  --display: "Instrument Serif", "Hoefler Text", Georgia, serif;
  --body:    "Newsreader", Georgia, "Times New Roman", serif;
  --mono:    "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;

  /* Scale */
  --t-hero:  clamp(2.9rem, 6.4vw, 5.4rem);
  --t-h1:    clamp(2.4rem, 5vw, 3.9rem);
  --t-h2:    clamp(1.75rem, 3vw, 2.4rem);
  --t-h3:    clamp(1.25rem, 2vw, 1.5rem);
  --t-body:  clamp(1.06rem, 0.42vw + 1rem, 1.19rem);
  --t-small: 0.9rem;
  --t-idx:   0.7rem;

  /* Space */
  --gut: clamp(1.25rem, 4vw, 3rem);
  --max: 1240px;
  --rail: 11rem;
  --sec-y: clamp(3.5rem, 7vw, 6.5rem);
}

/* ---------- 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; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
}
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--body);
  font-size: var(--t-body);
  line-height: 1.72;
  font-optical-sizing: auto;
  -webkit-font-smoothing: antialiased;
}
img, svg { max-width: 100%; height: auto; display: block; }
a { color: inherit; }

/* ---------- Utility ---------- */
.wrap { width: 100%; max-width: var(--max); margin-inline: auto; padding-inline: var(--gut); }
.skip {
  position: absolute; left: -9999px; top: 0; z-index: 200;
  background: var(--brass-lt); color: var(--ink);
  padding: 0.75rem 1.25rem; font-family: var(--mono); font-size: var(--t-small);
}
.skip:focus { left: 0; }
:focus-visible { outline: 2px solid var(--brass-lt); outline-offset: 3px; }

.idx {
  font-family: var(--mono);
  font-size: var(--t-idx);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  font-weight: 500;
}

/* ==========================================================================
   Masthead
   ========================================================================== */
.masthead {
  background: var(--ink);
  color: var(--paper);
  position: sticky; top: 0; z-index: 100;
  border-bottom: 1px solid var(--rule-dark);
}
.masthead__inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1.5rem; min-height: 76px;
}
.brand { display: flex; align-items: center; gap: 0.85rem; text-decoration: none; padding: 0.6rem 0; }
.brand svg { width: 38px; height: 38px; flex: none; }
.brand__name {
  font-family: var(--display);
  font-size: 1.3rem; line-height: 1.05; letter-spacing: 0.01em; color: var(--paper);
}
.brand__sub {
  display: block; font-family: var(--mono); font-size: 0.58rem;
  letter-spacing: 0.24em; text-transform: uppercase;
  color: var(--brass-lt); margin-top: 0.28rem;
}

.nav__list { display: flex; align-items: center; gap: 0.35rem; list-style: none; margin: 0; padding: 0; }
.nav__list a {
  display: block; text-decoration: none;
  font-family: var(--mono); font-size: 0.73rem; letter-spacing: 0.11em; text-transform: uppercase;
  color: rgba(251, 250, 247, 0.76);
  padding: 0.6rem 0.7rem; border-radius: 2px;
  transition: color 0.18s ease, background 0.18s ease;
}
.nav__list a:hover { color: var(--brass-lt); background: rgba(201, 164, 85, 0.08); }
.nav__list a[aria-current="page"] { color: var(--brass-lt); box-shadow: inset 0 -1px 0 var(--brass-lt); }

.burger {
  display: none; background: none; border: 1px solid var(--rule-dark);
  color: var(--paper); padding: 0.6rem 0.7rem; cursor: pointer; border-radius: 2px;
}
.burger span { display: block; width: 20px; height: 1.5px; background: currentColor; margin: 4px 0; transition: transform .22s ease, opacity .22s ease; }
.burger[aria-expanded="true"] span:nth-child(1) { transform: translateY(5.5px) rotate(45deg); }
.burger[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.burger[aria-expanded="true"] span:nth-child(3) { transform: translateY(-5.5px) rotate(-45deg); }

@media (max-width: 940px) {
  .burger { display: block; }
  .nav {
    position: absolute; inset: 100% 0 auto 0;
    background: var(--ink-2); border-bottom: 1px solid var(--rule-dark);
    max-height: 0; overflow: hidden; transition: max-height 0.28s ease;
  }
  .nav[data-open="true"] { max-height: 70vh; overflow-y: auto; }
  .nav__list { flex-direction: column; align-items: stretch; gap: 0; padding: 0.5rem var(--gut) 1.25rem; }
  .nav__list a { padding: 0.85rem 0; font-size: 0.8rem; border-bottom: 1px solid rgba(255,255,255,0.07); }
}

/* ==========================================================================
   Hero
   ========================================================================== */
.hero {
  background: var(--ink);
  color: var(--paper);
  position: relative;
  overflow: hidden;
  padding-block: clamp(3.5rem, 8vw, 7rem);
}
.hero::before {
  content: ""; position: absolute; inset: 0;
  background-image: url("../img/lattice.svg");
  background-size: 620px; opacity: 0.5; pointer-events: none;
}
.hero__inner { position: relative; display: grid; grid-template-columns: 1fr; gap: clamp(2rem, 4vw, 3.5rem); align-items: center; }
.hero--split .hero__inner { grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.9fr); }
@media (max-width: 900px) { .hero--split .hero__inner { grid-template-columns: 1fr; } }

.hero__eyebrow { color: var(--brass-lt); margin: 0 0 1.4rem; display: flex; align-items: center; gap: 0.8rem; flex-wrap: wrap; }
.hero__eyebrow::after { content: ""; flex: 1; min-width: 2rem; height: 1px; background: var(--rule-dark); }

.hero h1 {
  font-family: var(--display); font-weight: 400;
  font-size: var(--t-hero); line-height: 1.04; letter-spacing: -0.015em;
  margin: 0 0 1.5rem; text-wrap: balance;
}
.hero h1 em { font-style: italic; color: var(--brass-lt); }
.hero__lede {
  font-size: clamp(1.1rem, 1.4vw, 1.32rem); line-height: 1.65;
  color: rgba(251, 250, 247, 0.82); max-width: 62ch; margin: 0 0 2rem;
}
.hero__meta { display: flex; flex-wrap: wrap; gap: 0 2.5rem; padding-top: 1.6rem; border-top: 1px solid var(--rule-dark); }
.hero__meta div { padding-block: 0.4rem; }
.hero__meta dt { color: var(--brass-lt); margin: 0 0 0.3rem; }
.hero__meta dd { margin: 0; font-size: 0.98rem; color: rgba(251,250,247,0.9); }

.portrait-frame { position: relative; padding: 0.9rem; border: 1px solid var(--rule-dark); background: rgba(255,255,255,0.02); }
.portrait-frame img { width: 100%; }
.portrait-frame figcaption { margin-top: 0.9rem; color: rgba(251,250,247,0.6); font-family: var(--mono); font-size: 0.66rem; letter-spacing: 0.1em; text-transform: uppercase; line-height: 1.6; }

/* ==========================================================================
   Breadcrumb
   ========================================================================== */
.crumbs { background: var(--paper-2); border-bottom: 1px solid var(--rule); }
.crumbs ol { display: flex; flex-wrap: wrap; gap: 0.55rem; list-style: none; margin: 0; padding: 0.85rem 0; }
.crumbs li { display: flex; align-items: center; gap: 0.55rem; }
.crumbs li + li::before { content: "/"; color: var(--brass); }
.crumbs a { color: var(--slate); text-decoration: none; }
.crumbs a:hover { color: var(--brass); }
.crumbs [aria-current="page"] { color: var(--ink); }

/* ==========================================================================
   Record sections (the signature)
   ========================================================================== */
.rec { padding-block: var(--sec-y); border-top: 1px solid var(--rule); }
.rec:first-of-type { border-top: 0; }
.rec__grid { display: grid; grid-template-columns: var(--rail) minmax(0, 1fr); gap: clamp(1.5rem, 4vw, 3.5rem); }
@media (max-width: 900px) { .rec__grid { grid-template-columns: 1fr; gap: 1.1rem; } }

.rec__rail { position: sticky; top: 110px; align-self: start; }
@media (max-width: 900px) { .rec__rail { position: static; display: flex; gap: 0.85rem; align-items: baseline; } }
.rec__no { display: block; color: var(--brass); font-family: var(--mono); font-size: 1.05rem; letter-spacing: 0.04em; }
.rec__label { display: block; color: var(--slate-lt); margin-top: 0.5rem; padding-top: 0.5rem; border-top: 1px solid var(--rule); }
@media (max-width: 900px) { .rec__label { margin-top: 0; padding-top: 0; border-top: 0; } }

.rec__body > *:first-child { margin-top: 0; }
.rec__body > *:last-child { margin-bottom: 0; }

/* Section on ink */
.rec--ink { background: var(--ink); color: var(--paper); border-top: 0; }
.rec--ink .rec__no { color: var(--brass-lt); }
.rec--ink .rec__label { color: rgba(251,250,247,0.6); border-top-color: var(--rule-dark); }
.rec--ink h2, .rec--ink h3 { color: var(--paper); }
.rec--ink p { color: rgba(251, 250, 247, 0.82); }
.rec--ink a { color: var(--brass-lt); }

.rec--tint { background: var(--paper-2); border-top: 0; }

/* ==========================================================================
   Prose
   ========================================================================== */
h1, h2, h3, h4 { font-family: var(--display); font-weight: 400; letter-spacing: -0.01em; text-wrap: balance; }
h1 { font-size: var(--t-h1); line-height: 1.06; margin: 0 0 1.4rem; }
h2 { font-size: var(--t-h2); line-height: 1.14; margin: 0 0 1.1rem; }
h3 { font-size: var(--t-h3); line-height: 1.25; margin: 2.2rem 0 0.8rem; font-family: var(--body); font-weight: 600; letter-spacing: 0; }
p { margin: 0 0 1.25rem; }

/* Cap the reading measure on prose only. Figures, cards and data blocks stay full width. */
.rec__body > p,
.rec__body > ul:not(.cards):not(.blocks),
.rec__body > ol,
.rec__body > h2,
.rec__body > h3,
.rec__body > blockquote,
.rec__body > .src { max-width: 68ch; }
.faq summary, .faq__a { max-width: 68ch; }
.rec__body p:last-child { margin-bottom: 0; }
.lede { font-size: 1.2rem; line-height: 1.62; color: var(--slate); }

.rec__body ul, .rec__body ol { margin: 0 0 1.35rem; padding-left: 0; list-style: none; }
.rec__body li { position: relative; padding-left: 1.6rem; margin-bottom: 0.72rem; }
.rec__body ul > li::before {
  content: ""; position: absolute; left: 0; top: 0.72em;
  width: 8px; height: 1px; background: var(--brass);
}
.rec__body ol { counter-reset: n; }
.rec__body ol > li { counter-increment: n; }
.rec__body ol > li::before {
  content: counter(n, decimal-leading-zero); position: absolute; left: 0; top: 0.1em;
  font-family: var(--mono); font-size: 0.72rem; color: var(--brass); letter-spacing: 0.05em;
}
.rec__body a { color: var(--jade); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 3px; }
.rec__body a:hover { color: var(--brass); }
.rec__body a.card,
.rec__body a.btn { text-decoration: none; color: inherit; }
.rec__body a.card:hover { color: inherit; }
.rec--ink .rec__body a { color: var(--brass-lt); }

blockquote {
  margin: 2rem 0; padding: 0 0 0 1.6rem; border-left: 2px solid var(--brass);
  font-size: 1.22rem; line-height: 1.6; font-style: italic; color: var(--ink);
}
blockquote cite { display: block; margin-top: 0.9rem; font-style: normal; font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--slate-lt); }

/* Source note - the AI-SEO / E-E-A-T attribution device */
.src {
  margin: 1.75rem 0; padding: 0.95rem 1.15rem;
  background: var(--paper-2); border-left: 2px solid var(--brass);
  font-size: 0.92rem; line-height: 1.6; color: var(--slate);
}
.rec--ink .src, .rec--tint .src { background: rgba(255,255,255,0.05); }
.rec--tint .src { background: var(--paper); }
.src strong { display: block; font-family: var(--mono); font-size: var(--t-idx); letter-spacing: 0.15em; text-transform: uppercase; color: var(--brass); margin-bottom: 0.35rem; font-weight: 500; }
.src a { color: inherit; }

/* Key-fact callout */
.fact { display: grid; gap: 1px; background: var(--rule); border: 1px solid var(--rule); margin: 2rem 0; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); }
.fact > div { background: var(--paper); padding: 1.25rem 1.15rem; }
.rec--tint .fact > div { background: var(--paper-2); }
.fact dt { color: var(--slate-lt); font-family: var(--mono); font-size: var(--t-idx); letter-spacing: 0.13em; text-transform: uppercase; margin-bottom: 0.55rem; }
.fact dd { margin: 0; font-family: var(--display); font-size: 1.55rem; line-height: 1.15; }

/* Figures */
figure { margin: 2.25rem 0; }
figure img { border: 1px solid var(--rule); background: var(--paper-2); width: 100%; }
.rec--ink figure img { border-color: var(--rule-dark); background: rgba(255,255,255,0.03); }
figcaption { margin-top: 0.75rem; font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--slate-lt); line-height: 1.65; }

/* ==========================================================================
   Cards
   ========================================================================== */
.cards { display: grid; gap: 1.5rem; grid-template-columns: repeat(auto-fit, minmax(272px, 1fr)); margin: 0; padding: 0; list-style: none; }
.cards li { padding: 0; margin: 0; }
.cards li::before { display: none !important; }
.card { display: flex; flex-direction: column; height: 100%; background: var(--paper); border: 1px solid var(--rule); text-decoration: none; transition: border-color .2s ease, transform .2s ease; }
.rec--tint .card { background: var(--paper); }
.card:hover { border-color: var(--brass); transform: translateY(-2px); }
.card__img { border-bottom: 1px solid var(--rule); background: var(--ink); }
.card__img img { width: 100%; }
.card__in { padding: 1.35rem 1.35rem 1.5rem; display: flex; flex-direction: column; flex: 1; }
.card__kicker { color: var(--brass); margin-bottom: 0.7rem; }
.card__t { font-family: var(--display); font-size: 1.32rem; line-height: 1.2; margin: 0 0 0.7rem; color: var(--ink); }
.card__d { font-size: 0.98rem; line-height: 1.6; color: var(--slate); margin: 0 0 1.1rem; }
.card__more { margin-top: auto; font-family: var(--mono); font-size: var(--t-idx); letter-spacing: 0.13em; text-transform: uppercase; color: var(--jade); }
.card:hover .card__more { color: var(--brass); }

/* Case study / value blocks */
.blocks { display: grid; gap: 1px; background: var(--rule); border: 1px solid var(--rule); margin: 2rem 0 0; padding: 0; list-style: none; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); }
.blocks li { background: var(--paper); padding: 1.6rem 1.4rem; margin: 0; }
.blocks li::before { display: none !important; }
.rec--ink .blocks { background: var(--rule-dark); border-color: var(--rule-dark); }
.rec--ink .blocks li { background: var(--ink); }
.blocks h3 { margin: 0.65rem 0 0.6rem; font-size: 1.12rem; }
.blocks p { font-size: 0.97rem; line-height: 1.62; margin: 0; color: var(--slate); }
.rec--ink .blocks p { color: rgba(251,250,247,0.75); }

/* ==========================================================================
   FAQ
   ========================================================================== */
.faq { margin: 0; border-top: 1px solid var(--rule); }
.rec--ink .faq { border-top-color: var(--rule-dark); }
.faq details { border-bottom: 1px solid var(--rule); }
.rec--ink .faq details { border-bottom-color: var(--rule-dark); }
.faq summary {
  cursor: pointer; list-style: none; padding: 1.2rem 2.5rem 1.2rem 0; position: relative;
  font-family: var(--body); font-weight: 600; font-size: 1.08rem; line-height: 1.45;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+"; position: absolute; right: 0.3rem; top: 50%; transform: translateY(-50%);
  font-family: var(--mono); font-size: 1.25rem; color: var(--brass); line-height: 1;
}
.faq details[open] summary::after { content: "\2212"; }
.faq summary:hover { color: var(--brass); }
.faq__a { padding: 0 2.5rem 1.4rem 0; }
.faq__a p { margin: 0 0 0.9rem; color: var(--slate); }
.rec--ink .faq__a p { color: rgba(251,250,247,0.78); }
.faq__a p:last-child { margin-bottom: 0; }

/* ==========================================================================
   Video
   ========================================================================== */
.video { position: relative; padding-top: 56.25%; border: 1px solid var(--rule); background: var(--ink); margin: 2rem 0 0.75rem; }
.rec--ink .video { border-color: var(--rule-dark); }
.video iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }

/* ==========================================================================
   CTA band
   ========================================================================== */
.band { background: var(--jade); color: var(--paper); padding-block: clamp(3rem, 6vw, 4.75rem); }
.band h2 { color: var(--paper); margin-bottom: 1rem; }
.band p { color: rgba(251,250,247,0.86); max-width: 58ch; margin: 0 auto 2rem; }
.band__in { text-align: center; }
.btn {
  display: inline-block; text-decoration: none;
  font-family: var(--mono); font-size: 0.74rem; letter-spacing: 0.14em; text-transform: uppercase;
  padding: 1rem 2rem; border: 1px solid var(--brass-lt); color: var(--paper);
  transition: background .2s ease, color .2s ease;
}
.btn:hover { background: var(--brass-lt); color: var(--ink); }
.btn--solid { background: var(--brass-lt); color: var(--ink); border-color: var(--brass-lt); }
.btn--solid:hover { background: transparent; color: var(--brass-lt); }

/* ==========================================================================
   Forms
   ========================================================================== */
.form { display: grid; gap: 1.15rem; max-width: 560px; margin-top: 1.75rem; }
.form label { font-family: var(--mono); font-size: var(--t-idx); letter-spacing: 0.13em; text-transform: uppercase; color: var(--slate); display: block; margin-bottom: 0.5rem; }
.form input, .form textarea {
  width: 100%; font-family: var(--body); font-size: 1rem; color: var(--ink);
  background: var(--paper); border: 1px solid var(--rule); padding: 0.85rem 1rem; border-radius: 0;
}
.form input:focus, .form textarea:focus { border-color: var(--brass); outline: none; }
.form textarea { min-height: 150px; resize: vertical; }
.form button { justify-self: start; background: var(--ink); color: var(--paper); border: 1px solid var(--ink); cursor: pointer; font-family: var(--mono); font-size: 0.74rem; letter-spacing: 0.14em; text-transform: uppercase; padding: 1rem 2rem; }
.form button:hover { background: var(--brass); border-color: var(--brass); color: var(--ink); }
.form__note { font-size: 0.9rem; color: var(--slate-lt); }

/* ==========================================================================
   Article meta
   ========================================================================== */
.artmeta { display: flex; flex-wrap: wrap; gap: 0.6rem 1.5rem; padding: 1.1rem 0; border-top: 1px solid var(--rule-dark); border-bottom: 1px solid var(--rule-dark); margin-top: 2rem; color: rgba(251,250,247,0.72); }
.artmeta span { display: inline-flex; gap: 0.5rem; }
.artmeta b { color: var(--brass-lt); font-weight: 500; }

/* ==========================================================================
   Footer
   ========================================================================== */
.foot { background: var(--ink); color: rgba(251,250,247,0.72); padding-block: clamp(3rem, 5vw, 4.5rem) 2rem; }
.foot__grid { display: grid; gap: 2.5rem; grid-template-columns: minmax(0, 1.5fr) repeat(auto-fit, minmax(150px, 1fr)); }
.foot h2 { font-family: var(--mono); font-size: var(--t-idx); letter-spacing: 0.15em; text-transform: uppercase; color: var(--brass-lt); margin: 0 0 1.1rem; font-weight: 500; }
.foot ul { list-style: none; margin: 0; padding: 0; }
.foot li { margin-bottom: 0.62rem; }
.foot a { color: rgba(251,250,247,0.72); text-decoration: none; font-size: 0.96rem; }
.foot a:hover { color: var(--brass-lt); }
.foot__blurb { font-size: 0.98rem; line-height: 1.65; max-width: 42ch; margin: 1.1rem 0 0; }
.foot__bar { margin-top: 3rem; padding-top: 1.6rem; border-top: 1px solid var(--rule-dark); display: flex; flex-wrap: wrap; gap: 1rem; justify-content: space-between; align-items: center; }
.foot__bar p { margin: 0; font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.1em; text-transform: uppercase; color: rgba(251,250,247,0.5); }

/* ==========================================================================
   Reveal
   ========================================================================== */
@media (prefers-reduced-motion: no-preference) {
  /* Scoped to html.js so content is never hidden if JavaScript fails to run. */
  html.js .rv { opacity: 0; transform: translateY(14px); transition: opacity .6s ease, transform .6s ease; }
  html.js .rv.is-in { opacity: 1; transform: none; }
}