/* page scaffolding: nav, sections, container, endcap, media-block */

.container {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--pad);
}

/* ---- scroll progress ---- */
.scroll-bar {
  position: fixed;
  top: 0; left: 0;
  height: 2px;
  width: 100%;
  transform: scaleX(0);
  transform-origin: 0 0;
  will-change: transform;
  background: var(--accent);
  z-index: 300;
}

/* ---- nav ---- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  z-index: 200;
  display: flex;
  align-items: stretch;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: border-color var(--d-base) var(--ease), background var(--d-base) var(--ease),
              box-shadow var(--d-base) var(--ease);
}
.nav.is-scrolled {
  background: color-mix(in srgb, var(--paper) 94%, transparent);
  border-bottom-color: var(--hairline);
  box-shadow: 0 10px 30px -24px rgba(16, 32, 48, 0.4);
}

.nav__inner {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--pad);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s5);
}
/* brand: an open-book mark (cobalt spine, one spark) beside a single-deck wordmark */
.nav__brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  white-space: nowrap;
}
.brand__mark {
  width: 25px;
  height: 25px;
  flex: none;
  color: var(--ink);
  overflow: visible;
  transition: transform var(--d-base) var(--ease-out);
}
.nav__brand:hover .brand__mark { transform: translateY(-1px) rotate(-5deg); }
@media (prefers-reduced-motion: reduce) {
  .brand__mark { transition: none; }
  .nav__brand:hover .brand__mark { transform: none; }
}
.brand__title {
  font-family: var(--font-display);
  font-size: 15.5px;
  font-weight: 600;
  letter-spacing: -0.006em;
  line-height: 1;
  color: var(--ink);
}
/* Space Grotesk has no italic — the second word speaks in cornflower instead */
.brand__title em { font-style: normal; font-weight: 500; color: var(--accent); }

.nav__links {
  display: flex;
  align-items: center;
  gap: clamp(12px, 1.8vw, 26px);
  list-style: none;
  padding: 0;
}
/* contents-style entries: a gradient filament sweeps in underneath
   on hover/active */
.nav__link {
  position: relative;
  display: inline-block;
  white-space: nowrap;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: var(--track-wide);
  text-transform: uppercase;
  text-decoration: none;
  color: var(--ink-muted);
  padding-block: 4px;
  background-image: linear-gradient(90deg, var(--accent), var(--accent-spark));
  background-repeat: no-repeat;
  background-position: 0 100%;
  background-size: 0% 1.5px;
  transition: color var(--d-fast) var(--ease), background-size var(--d-base) var(--ease-out);
}
.nav__link:hover,
.nav__link.is-active { color: var(--ink); background-size: 100% 1.5px; }

.nav__cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: var(--track-wide);
  text-transform: uppercase;
  text-decoration: none;
  color: var(--paper);
  background: linear-gradient(150deg, #2c3648, var(--ink) 62%);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.14), 0 8px 18px -10px rgba(16, 32, 48, 0.55);
  padding: 7px 15px;
  border-radius: var(--r-full);
  white-space: nowrap;
  transition: transform var(--d-fast) var(--ease), background var(--d-fast) var(--ease),
              box-shadow var(--d-base) var(--ease-out);
}
.nav__cta .cta__arr { display: inline-block; transition: transform var(--d-base) var(--ease-out); }
.nav__cta:hover {
  transform: translateY(-1px);
  background: linear-gradient(150deg, var(--moss), var(--moss-deep) 70%);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.22), 0 10px 24px -10px rgba(61, 99, 194, 0.6);
}
.nav__cta:hover .cta__arr { transform: translate(1.5px, -1.5px); }

/* ---- sections ---- */
.section { padding-block: var(--section-gap); position: relative; }
.section--flush { padding-top: 0; }
.section--band { background: var(--paper-deep); }
.section--band + .section--band { padding-top: 0; }

/* running head: mono chapter marker in role color */
.chapter {
  display: flex;
  align-items: baseline;
  gap: var(--s3);
  margin-bottom: var(--s6);
}
.chapter__num {
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: var(--track-wider);
  text-transform: uppercase;
  color: var(--role, var(--ink-muted));
}
.chapter__rule { flex: 1; height: 1px; background: var(--hairline); }

.section-title {
  font-family: var(--font-display);
  font-size: var(--fs-h2);
  font-weight: 600;
  letter-spacing: -0.012em;
  margin-bottom: var(--s5);
  max-width: 20ch;
}
.section-lead {
  font-size: var(--fs-lead);
  line-height: 1.6;
  color: var(--ink-soft);
  max-width: 62ch;
}

/* ---- media-block figure component ---- */
.media-block { margin-block: var(--s8); }
.media-block__chrome {
  border: 1px solid var(--hairline);
  border-radius: var(--r-sm);
  overflow: hidden;
  background: var(--paper-elev);
  padding: clamp(8px, 1.2vw, 16px);
}
.media-block__chrome img { width: 100%; height: auto; }
.media-block__meta { display: grid; gap: var(--s2); padding-top: var(--s4); }
.media-block__label {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: var(--track-wider);
  text-transform: uppercase;
  color: var(--role, var(--ink-muted));
}
.media-block__title {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 600;
}
.media-block__caption {
  font-size: var(--fs-small);
  color: var(--ink-muted);
  max-width: 72ch;
}

/* ---- endcap: quiet close of the page, one line of chrome ---- */
.endcap {
  border-top: 1px solid var(--hairline);
  margin-top: var(--section-gap);
  padding-block: var(--s6);
  text-align: center;
}
.endcap__top {
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-muted);
  text-decoration: none;
}
.endcap__top:hover { color: var(--accent); }

/* ---- reveal choreography ---- */
[data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity var(--d-slow) var(--ease) var(--reveal-delay, 0ms),
              transform var(--d-slow) var(--ease) var(--reveal-delay, 0ms);
}
[data-reveal].is-in { opacity: 1; transform: none; }
.no-js [data-reveal] { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  [data-reveal] { opacity: 1; transform: none; transition: none; }
}

@media (max-width: 760px) {
  .nav__links { display: none; }
  .section { padding-block: max(56px, 12vw); }
}