/* Framemark — Film Leader Countdown
   Signature: sprocket strip, countdown glyph, SMPTE footer timecode.
   Acetate black + emulsion cream + leader amber.
   Archivo Black + Source Serif 4 + IBM Plex Mono.
   Distinct from: split-flap (FlapIndex), thermal receipt, NCR, tractor, parchment. */

:root {
  color-scheme: dark light;
  --acetate: #0B0B0C;
  --emulsion: #F2EDE3;
  --amber: #E8A317;
  --amber-dim: #C47A0A;
  --sprocket: #8A8A86;
  --safe: #B83A2F;
  --muted: #A8A49A;
  --rule: rgba(232, 163, 23, 0.28);
  --display: "Archivo Black", Impact, sans-serif;
  --text: "Source Serif 4", "Iowan Old Style", Georgia, serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
  --shell: 44rem;
  --gutter: clamp(1rem, 4vw, 1.75rem);
  --band: clamp(2rem, 5vw, 3.5rem);
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(ellipse 90% 50% at 50% -20%, rgba(232, 163, 23, 0.12), transparent 60%),
    linear-gradient(180deg, #141414 0%, var(--acetate) 40%, #101010 100%);
  color: var(--emulsion);
  font-family: var(--text);
  font-size: clamp(1.05rem, 1rem + 0.22vw, 1.14rem);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

img, svg { max-width: 100%; display: block; }

a {
  color: var(--amber);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.22em;
}
a:hover { color: var(--emulsion); }

:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 3px;
}

.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--amber);
  color: var(--acetate);
  padding: 0.65rem 1rem;
  z-index: 40;
  font-family: var(--mono);
  font-size: 0.85rem;
}
.skip:focus { left: var(--gutter); top: 0.5rem; }

.shell {
  width: min(100% - 2 * var(--gutter), var(--shell));
  margin-inline: auto;
}

/* Film chassis with sprocket rails */
.film {
  position: relative;
  width: min(100% - 0.8rem, 48rem);
  margin: 1.1rem auto 3rem;
  background: var(--acetate);
  border: 1px solid rgba(138, 138, 134, 0.35);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.45);
  overflow: clip;
}
.film::before,
.film::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  width: 1.35rem;
  background:
    repeating-linear-gradient(
      180deg,
      transparent 0 1.1rem,
      var(--sprocket) 1.1rem 1.15rem,
      transparent 1.15rem 1.55rem,
      var(--acetate) 1.55rem 2.35rem,
      transparent 2.35rem 2.4rem
    );
  opacity: 0.55;
  pointer-events: none;
  z-index: 2;
}
.film::before { left: 0; border-right: 1px solid rgba(138, 138, 134, 0.4); }
.film::after { right: 0; border-left: 1px solid rgba(138, 138, 134, 0.4); }
.film__inner {
  padding: 0 clamp(1.6rem, 5vw, 2.4rem);
  position: relative;
  z-index: 1;
}

.top {
  padding-top: 1.25rem;
  border-bottom: 1px solid var(--rule);
  margin-bottom: 0;
}
.top__row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  flex-wrap: wrap;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}
.brand {
  font-family: var(--display);
  font-size: 1.35rem;
  letter-spacing: 0.04em;
  color: var(--emulsion);
  text-decoration: none;
  text-transform: uppercase;
}
.brand:hover { color: var(--amber); }
.nav {
  display: flex;
  gap: 1.25rem;
  padding: 0.85rem 0 1rem;
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.nav a {
  color: var(--muted);
  text-decoration: none;
}
.nav a[aria-current="page"],
.nav a:hover { color: var(--amber); }

/* Hero — brand first, countdown signature */
.hero {
  position: relative;
  padding: var(--band) 0 2.2rem;
  isolation: isolate;
}
.hero__count {
  position: absolute;
  right: 0;
  top: 0.4rem;
  font-family: var(--display);
  font-size: clamp(5rem, 18vw, 9rem);
  line-height: 0.85;
  color: rgba(232, 163, 23, 0.12);
  letter-spacing: -0.04em;
  pointer-events: none;
  user-select: none;
  animation: leader-fade 6s ease-in-out infinite;
}
@keyframes leader-fade {
  0%, 100% { opacity: 0.35; }
  50% { opacity: 0.9; }
}
.hero__brand {
  font-family: var(--display);
  font-size: clamp(2.4rem, 7vw, 3.6rem);
  letter-spacing: 0.02em;
  text-transform: uppercase;
  margin: 0 0 0.75rem;
  color: var(--emulsion);
  position: relative;
}
.hero h1 {
  font-family: var(--text);
  font-weight: 600;
  font-size: clamp(1.25rem, 1.1rem + 0.8vw, 1.65rem);
  line-height: 1.35;
  max-width: 28ch;
  margin: 0 0 0.9rem;
  color: var(--emulsion);
}
.hero__stand {
  max-width: 38ch;
  color: var(--muted);
  margin: 0;
  font-size: 1.02rem;
}
.timecode {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-top: 1.5rem;
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--amber);
}
.timecode span {
  border: 1px solid var(--rule);
  padding: 0.35rem 0.55rem;
}

.block {
  padding: 2rem 0;
  border-top: 1px solid var(--rule);
}
.eyebrow {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--amber);
  margin: 0 0 0.5rem;
}
.block h2 {
  font-family: var(--display);
  font-size: clamp(1.3rem, 1rem + 1.2vw, 1.8rem);
  letter-spacing: 0.03em;
  text-transform: uppercase;
  margin: 0 0 1rem;
  font-weight: 400;
}

.library { display: grid; gap: 1.25rem; }
.entry {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1rem;
  align-items: start;
  padding: 1rem 0;
  border-bottom: 1px dashed rgba(138, 138, 134, 0.35);
}
.entry:last-child { border-bottom: 0; }
.entry__id {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--safe);
  margin: 0.35rem 0 0;
  white-space: nowrap;
}
.entry h3 {
  font-family: var(--text);
  font-size: 1.15rem;
  font-weight: 600;
  margin: 0 0 0.35rem;
  line-height: 1.35;
}
.entry h3 a {
  color: var(--emulsion);
  text-decoration: none;
}
.entry h3 a:hover { color: var(--amber); }
.entry p { margin: 0; color: var(--muted); font-size: 0.98rem; }

.standards {
  display: grid;
  gap: 1rem;
}
.standards li {
  list-style: none;
  padding-left: 1rem;
  border-left: 3px solid var(--amber-dim);
  color: var(--muted);
}
.standards ul { margin: 0; padding: 0; display: grid; gap: 0.9rem; }

.not-list {
  display: grid;
  gap: 0.55rem;
  margin: 0;
  padding: 0;
  list-style: none;
}
.not-list li {
  font-family: var(--mono);
  font-size: 0.82rem;
  padding: 0.55rem 0.7rem;
  border: 1px solid rgba(184, 58, 47, 0.35);
  color: var(--muted);
}

.faq details {
  border-bottom: 1px solid var(--rule);
  padding: 0.85rem 0;
}
.faq summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--emulsion);
}
.faq p { color: var(--muted); margin: 0.55rem 0 0; }

.foot {
  padding: 1.5rem 0 2rem;
  border-top: 1px solid var(--rule);
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--sprocket);
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  justify-content: space-between;
}
.foot a { color: var(--muted); text-decoration: none; }
.foot a:hover { color: var(--amber); }
.smpte {
  width: 100%;
  height: 0.55rem;
  margin-top: 1rem;
  background: linear-gradient(
    90deg,
    #fff 0 12.5%,
    #E8A317 12.5% 25%,
    #2a7 25% 37.5%,
    #48f 37.5% 50%,
    #c4a 50% 62.5%,
    #B83A2F 62.5% 75%,
    #222 75% 87.5%,
    #000 87.5% 100%
  );
  opacity: 0.55;
}

.article__head { padding: 2rem 0 0.5rem; }
.article__head h1 {
  font-family: var(--display);
  font-size: clamp(1.5rem, 1.2rem + 1.5vw, 2.2rem);
  text-transform: uppercase;
  letter-spacing: 0.02em;
  margin: 0 0 0.6rem;
  line-height: 1.15;
}
.article__meta {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.prose h2 {
  font-family: var(--display);
  font-size: 1.15rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin: 1.8rem 0 0.6rem;
}
.prose p { color: var(--muted); }
.prose p strong, .prose b { color: var(--emulsion); font-weight: 600; }
.prose ul { color: var(--muted); padding-left: 1.2rem; }
.prose li { margin: 0.35rem 0; }

.ghost { opacity: 0.95; }

@media (prefers-reduced-motion: reduce) {
  .hero__count { animation: none; }
}