:root {
  --onyx: #121212;
  --linen: #f3eee4;
  --paper: #fbf8f1;
  --pine: #2f4738;
  --silver: #aca39d;
  --blue: #244253;
  --flame: #f15a29;
  --max: 1440px;
  --gutter: clamp(1.25rem, 4vw, 4.5rem);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--linen);
  color: var(--onyx);
  font-family: "Roboto", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.55;
}
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: .28em; }
a:hover { text-decoration-color: var(--flame); }
h1, h2, h3, p { margin-top: 0; }
h1, h2, h3 { font-family: "Roboto Slab", Georgia, serif; line-height: 1.05; }
h1 { font-size: clamp(3rem, 10vw, 9.5rem); letter-spacing: -.055em; }
h2 { font-size: clamp(2.15rem, 5vw, 5.4rem); letter-spacing: -.04em; }
h3 { font-size: clamp(1.35rem, 2.2vw, 2rem); letter-spacing: -.02em; }
p { max-width: 42rem; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 2rem;
  min-height: 76px;
  padding: .8rem var(--gutter);
  background: color-mix(in srgb, var(--onyx) 94%, transparent);
  color: var(--linen);
  border-bottom: 1px solid color-mix(in srgb, var(--linen) 18%, transparent);
  backdrop-filter: blur(12px);
}
.brand-link { display: inline-flex; align-items: center; }
.brand-link img { width: clamp(130px, 14vw, 205px); height: auto; }
.main-nav { display: flex; justify-content: flex-end; gap: clamp(1rem, 2.4vw, 2.7rem); }
.main-nav a, .minor-link, .menu-toggle {
  font-size: .78rem;
  font-weight: 500;
  letter-spacing: .09em;
  text-transform: uppercase;
  text-decoration: none;
}
.main-nav a[aria-current="page"] { text-decoration: underline; text-decoration-color: var(--flame); }
.minor-link { color: var(--flame); }
.menu-toggle { display: none; border: 0; background: none; color: inherit; padding: .7rem; }

.hero, .section, .page-intro, .page-section { padding-inline: var(--gutter); }
.hero, .page-intro { min-height: calc(100svh - 76px); }
.hero {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  align-items: end;
  gap: 1rem;
  padding-block: clamp(4rem, 9vw, 9rem) clamp(2rem, 5vw, 5rem);
}
.hero-mark { grid-column: 1 / 10; width: min(100%, 920px); }
.hero-copy { grid-column: 8 / 13; align-self: end; }
.home-page main { background: var(--onyx); color: var(--linen); }
.home-page .section { border-color: color-mix(in srgb, var(--linen) 18%, transparent); }
.home-page .system-grid { background: color-mix(in srgb, var(--linen) 18%, transparent); }
.home-page .system-card { background: var(--onyx); color: var(--linen); }
.home-page .system-card:hover { background: var(--pine); }
.home-hero {
  grid-template-columns: minmax(0, .92fr) minmax(0, 1.08fr);
  gap: 0;
  align-items: stretch;
  padding: 0;
  min-height: calc(100svh - 76px);
}
.hero-panel {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 4rem;
  padding: clamp(3rem, 7vw, 7rem) var(--gutter) clamp(2.5rem, 5vw, 5rem);
}
.home-hero .hero-mark { width: min(100%, 650px); }
.home-hero .hero-copy { align-self: auto; max-width: 34rem; }
.hero-visual { min-height: calc(100svh - 76px); margin: 0; overflow: hidden; }
.hero-visual img { width: 100%; height: 100%; object-fit: cover; object-position: 50% 42%; }
.eyebrow { font-size: .76rem; font-weight: 500; letter-spacing: .12em; text-transform: uppercase; }
.lede { font-family: "Roboto Slab", Georgia, serif; font-size: clamp(1.35rem, 2.8vw, 2.35rem); line-height: 1.25; }
.cta { display: inline-flex; align-items: center; gap: .75rem; margin-top: 1.25rem; font-weight: 500; }
.cta::after { content: "→"; color: var(--flame); }

.section { padding-block: clamp(5rem, 11vw, 11rem); border-top: 1px solid color-mix(in srgb, var(--onyx) 18%, transparent); }
.section-grid { display: grid; grid-template-columns: repeat(12, 1fr); gap: 1rem; max-width: var(--max); margin: 0 auto; }
.section-title { grid-column: 1 / 7; }
.section-copy { grid-column: 8 / 13; padding-top: .7rem; }
.statement { font-family: "Roboto Slab", Georgia, serif; font-size: clamp(2.3rem, 6vw, 7rem); line-height: 1.04; letter-spacing: -.045em; }

.system-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; margin-top: clamp(3rem, 6vw, 6rem); background: color-mix(in srgb, var(--onyx) 18%, transparent); }
.system-card { min-height: 360px; padding: clamp(1.5rem, 3vw, 3rem); background: var(--linen); text-decoration: none; }
.system-card:hover { background: var(--onyx); color: var(--linen); }
.system-card .number { color: var(--flame); font-size: .75rem; letter-spacing: .12em; }
.system-card h3 { margin-top: 4rem; }

.episode-feature { padding: 0; background: var(--onyx); color: var(--linen); }
.episode-feature-grid { display: grid; grid-template-columns: 1.05fr .95fr; min-height: 88svh; }
.episode-image { width: 100%; height: 100%; min-height: 600px; object-fit: cover; filter: grayscale(1) contrast(1.05); }
.episode-image.is-key-visual { object-fit: contain; object-position: center; background: #000; filter: none; }
.episode-copy { display: flex; flex-direction: column; justify-content: space-between; padding: var(--gutter); }
.episode-copy .cta::after { color: var(--flame); }

.episode-rail-section {
  overflow: hidden;
  padding: clamp(4rem, 8vw, 7rem) 0 clamp(5rem, 9vw, 8rem);
  background: var(--onyx);
  color: var(--linen);
  border-top: 1px solid #343434;
}
.episode-rail-head { padding-inline: var(--gutter); }
.episode-rail-head h2 { margin-bottom: clamp(2rem, 4vw, 3.5rem); font-size: clamp(2.15rem, 5vw, 4.8rem); }
.episode-rail {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(280px, 1fr);
  gap: clamp(.8rem, 1.4vw, 1.4rem);
  max-width: var(--max);
  margin: 0 auto;
  padding-inline: var(--gutter);
  overflow-x: auto;
  overscroll-behavior-inline: contain;
  scroll-snap-type: inline mandatory;
  scrollbar-color: var(--flame) #2b2b2b;
  scrollbar-width: thin;
}
.episode-card {
  display: flex;
  min-width: 0;
  flex-direction: column;
  color: var(--linen);
  text-decoration: none;
  scroll-snap-align: start;
}
.episode-card-visual {
  position: relative;
  display: block;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: #000;
  border: 1px solid #3c3c3c;
}
.episode-card-visual img { width: 100%; height: 100%; object-fit: contain; }
.episode-card.is-active:hover .episode-card-visual { border-color: var(--flame); }
.episode-card-meta { display: grid; grid-template-columns: 1fr auto; gap: .35rem 1rem; padding-top: 1rem; }
.episode-card-code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .78rem; color: var(--flame); letter-spacing: .08em; }
.episode-card-meta strong { grid-column: 1 / -1; font-family: "Roboto Slab", Georgia, serif; font-size: clamp(1.1rem, 1.8vw, 1.45rem); letter-spacing: .01em; }
.episode-card-status { grid-column: 2; grid-row: 1; color: var(--silver); font-size: .72rem; letter-spacing: .08em; text-transform: uppercase; }
.test-pattern {
  background:
    linear-gradient(0deg, rgba(0,0,0,.95) 0 17%, transparent 17% 100%),
    linear-gradient(90deg,
      #d8d8d8 0 14.285%,
      #d5d31c 14.285% 28.57%,
      #20c6c4 28.57% 42.855%,
      #26bd37 42.855% 57.14%,
      #c82ab9 57.14% 71.425%,
      #c92727 71.425% 85.71%,
      #243ac5 85.71% 100%);
}
.test-pattern::after {
  content: "";
  position: absolute;
  inset: auto 0 0;
  height: 17%;
  background: linear-gradient(90deg, #1c1c1c 0 18%, #eee 18% 34%, #1c1c1c 34% 50%, #777 50% 66%, #1c1c1c 66% 100%);
}
.episode-card.is-unknown .test-pattern { filter: grayscale(1) brightness(.48); }
.episode-card.is-unknown .episode-card-code,
.episode-card.is-unknown .episode-card-meta strong { color: var(--silver); }

.kdex-strip { background: var(--blue); color: var(--linen); }
.code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: clamp(1.8rem, 5vw, 5rem); letter-spacing: -.045em; white-space: nowrap; }
.code-structure { font-size: clamp(1.55rem, 4.4vw, 4rem); }
.kdex-anatomy { overflow: hidden; }
.kdex-anatomy-inner { width: 100%; max-width: var(--max); margin: 0 auto; }
.kdex-anatomy-inner > .eyebrow { margin-bottom: clamp(3rem, 7vw, 7rem); }
.kdex-anatomy-code {
  display: grid;
  grid-template-columns: 3ch 3ch 1ch 3ch 1ch 2ch;
  align-items: start;
  width: 13ch;
  max-width: 100%;
  font-size: clamp(2.5rem, 10.7vw, 9rem);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}
.kdex-segment { display: flex; min-width: 0; flex-direction: column; }
.kdex-token,
.kdex-separator {
  display: block;
  font-size: 1em;
  font-weight: 500;
  line-height: .86;
  letter-spacing: 0;
  white-space: nowrap;
}
.kdex-label {
  margin-top: clamp(1.2rem, 2vw, 2rem);
  font-family: "Roboto", Arial, sans-serif;
  font-size: clamp(.72rem, 1.15vw, .95rem);
  font-weight: 500;
  letter-spacing: .1em;
  text-transform: uppercase;
}
.kdex-special {
  display: flex;
  flex-direction: column;
  gap: .2rem;
  max-width: 11rem;
  margin-top: 1rem;
  font-family: "Roboto", Arial, sans-serif;
  font-size: clamp(.68rem, 1vw, .88rem);
  line-height: 1.3;
}
.kdex-special strong {
  color: var(--flame);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 1.05em;
  letter-spacing: .06em;
}
.kdex-example { padding-block: clamp(2.75rem, 5vw, 5rem); }
.kdex-example .section-grid > h2 { font-size: clamp(1.35rem, 2.5vw, 2.3rem); }
.code-example { font-size: clamp(1.2rem, 2.2vw, 2rem); letter-spacing: -.025em; }
.kdex-example .list-lines { margin-top: 1.25rem; }
.kdex-example .list-lines li { padding-block: .8rem; }
.kdex-bible-visual { margin: 0; padding: clamp(1rem, 4vw, 4rem) var(--gutter); background: var(--onyx); }
.kdex-bible-visual img { width: min(100%, 980px); margin: 0 auto; }
.kdex-public { padding-inline: var(--gutter); }
.kdex-public-head { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; align-items: end; max-width: var(--max); margin: 0 auto clamp(3rem, 7vw, 7rem); }
.kdex-public-head h2 { margin-bottom: 0; }
.kdex-public-head .lede { justify-self: end; margin-bottom: .5rem; }
.kdex-table { max-width: var(--max); margin: 0 auto; border-bottom: 1px solid #3f3f3f; }
.kdex-row { display: grid; grid-template-columns: minmax(7rem, 1.1fr) minmax(11rem, 1.5fr) 2fr; gap: 1rem; padding: 1rem 0; border-top: 1px solid #3f3f3f; font-size: .92rem; }
.kdex-row strong { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-weight: 500; color: var(--flame); }
.kdex-row span:nth-child(2) { font-weight: 500; letter-spacing: .035em; }
.kdex-table-head { color: var(--silver); font-size: .72rem; font-weight: 500; letter-spacing: .1em; text-transform: uppercase; }
.kdex-table-head span:nth-child(2) { font-weight: 500; }
.kdex-row.is-masked span { color: var(--silver); letter-spacing: .14em; }

.signature { padding-block: clamp(7rem, 18vw, 18rem); text-align: center; }
.signature p { max-width: none; margin: 0; font-family: "Roboto Slab", Georgia, serif; font-size: clamp(2.2rem, 7vw, 8rem); line-height: 1.04; letter-spacing: -.045em; }

.site-footer { display: grid; grid-template-columns: 1fr auto; gap: 3rem; padding: 3rem var(--gutter); background: var(--onyx); color: var(--linen); }
.site-footer img { width: clamp(190px, 20vw, 240px); }
.footer-links { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 1rem 2rem; font-size: .76rem; letter-spacing: .08em; text-transform: uppercase; }
.footer-links a { text-decoration: none; }
.copyright { grid-column: 1 / -1; color: var(--silver); font-size: .75rem; }

.page-intro {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  align-items: end;
  gap: 1rem;
  padding-block: clamp(6rem, 12vw, 12rem) clamp(3rem, 7vw, 7rem);
}
.page-intro .eyebrow { grid-column: 1 / 4; align-self: start; }
.page-intro h1 { grid-column: 1 / 13; margin-bottom: 1rem; }
.page-intro .lede { grid-column: 7 / 13; }
.page-section { padding-block: clamp(4rem, 9vw, 9rem); border-top: 1px solid color-mix(in srgb, var(--onyx) 18%, transparent); }
.page-section .section-grid > h2 { grid-column: 1 / 7; }
.page-section .section-grid > .copy { grid-column: 8 / 13; }
.dark { background: var(--onyx); color: var(--linen); }
.pine { background: var(--pine); color: var(--linen); }
.blue { background: var(--blue); color: var(--linen); }
.flame { background: var(--flame); color: var(--onyx); }
.split-points { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; background: color-mix(in srgb, currentColor 25%, transparent); }
.split-points > div { min-height: 300px; padding: clamp(1.5rem, 3vw, 3rem); background: var(--linen); color: var(--onyx); }
.list-lines { margin: 2rem 0 0; padding: 0; list-style: none; }
.list-lines li { display: grid; grid-template-columns: minmax(110px, 1fr) 3fr; gap: 1.5rem; padding: 1.2rem 0; border-top: 1px solid currentColor; }
.list-lines strong { font-family: "Roboto Slab", Georgia, serif; }

.episode-hero { min-height: auto; padding-bottom: 0; }
.key-visual { width: 100%; height: min(88svh, 1100px); object-fit: contain; background: #000; filter: none; }
.product-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; margin-top: 3rem; background: color-mix(in srgb, currentColor 25%, transparent); }
.product { display: flex; align-items: flex-end; min-height: 180px; padding: 2rem; background: var(--linen); color: var(--onyx); }
.product code { display: block; font-size: clamp(1rem, 2vw, 1.4rem); }

.rule-page { background: var(--onyx); color: var(--linen); }
.rule-page .site-header { position: static; background: var(--onyx); border-color: #343434; }
.rule-page .main-nav, .rule-page .minor-link { display: none; }
.rule-page .page-intro { min-height: 70svh; }
.rule-page .page-section { border-color: #343434; }
.rule-page .list-lines li { border-color: #3f3f3f; }
.rule-status { color: var(--flame); }
.notice { padding: 1rem 1.25rem; border: 1px solid var(--flame); color: var(--flame); }

@media (max-width: 900px) {
  .site-header { grid-template-columns: 1fr auto; }
  .minor-link { display: none; }
  .menu-toggle { display: inline-block; }
  .main-nav {
    display: none;
    grid-column: 1 / -1;
    flex-direction: column;
    align-items: flex-start;
    padding: 1.5rem 0 1rem;
  }
  .main-nav.is-open { display: flex; }
  .hero-mark { grid-column: 1 / 13; }
  .hero-copy, .section-title, .section-copy, .page-intro .lede, .page-section .section-grid > h2, .page-section .section-grid > .copy { grid-column: 1 / 13; }
  .home-hero { position: relative; display: block; min-height: calc(100svh - 76px); }
  .home-hero .hero-panel { position: relative; z-index: 1; min-height: calc(100svh - 76px); padding-block: 2.5rem 3rem; background: linear-gradient(90deg, rgba(18,18,18,.94) 0%, rgba(18,18,18,.62) 55%, rgba(18,18,18,.12) 100%); }
  .home-hero .hero-mark { width: min(76vw, 420px); margin-inline: auto; }
  .home-hero .hero-copy { max-width: 25rem; }
  .hero-visual { position: absolute; inset: 0; min-height: 0; }
  .hero-visual img { object-position: 52% 40%; }
  .system-grid { grid-template-columns: 1fr; }
  .system-card { min-height: 260px; }
  .episode-feature-grid { grid-template-columns: 1fr; }
  .episode-image { min-height: 70svh; }
  .episode-copy { min-height: 520px; }
  .episode-rail { grid-auto-columns: min(78vw, 540px); max-width: none; }
  .page-intro .eyebrow { grid-column: 1 / 13; }
  .split-points, .product-list { grid-template-columns: 1fr; }
  .kdex-public-head { grid-template-columns: 1fr; }
  .kdex-public-head .lede { justify-self: start; }
  .site-footer { grid-template-columns: 1fr; }
  .footer-links { justify-content: flex-start; }
  .copyright { grid-column: auto; }
}

@media (max-width: 560px) {
  .hero { min-height: 78svh; }
  .home-hero, .home-hero .hero-panel { min-height: calc(100svh - 76px); }
  .home-hero .hero-panel { background: linear-gradient(180deg, rgba(18,18,18,.9) 0%, rgba(18,18,18,.16) 46%, rgba(18,18,18,.9) 100%); }
  .section, .page-section { padding-block: 4.5rem; }
  .episode-image { min-height: 56svh; }
  .episode-rail { grid-auto-columns: 82vw; padding-right: var(--gutter); }
  .code { font-size: 1.55rem; }
  .kdex-anatomy { padding-block: 4rem 5rem; }
  .kdex-anatomy-inner > .eyebrow { margin-bottom: 3rem; }
  .kdex-label { margin-top: 1rem; font-size: .58rem; letter-spacing: .07em; }
  .kdex-special { margin-top: .75rem; font-size: .58rem; line-height: 1.25; }
  .list-lines li { grid-template-columns: 1fr; gap: .35rem; }
  .kdex-row { grid-template-columns: 6.7rem 1fr; gap: .35rem 1rem; }
  .kdex-row > :nth-child(3) { grid-column: 2; color: var(--silver); }
  .kdex-table-head > :nth-child(3) { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}