/* =============================================================================
   page.css — catalog layout · Soft Structuralism + Z-Axis Cascade
   Grammar from extract.sys High-end: nav pill, grain, plates, bezel, invert.
   ============================================================================= */

/* --- skip ----------------------------------------------------------------- */
.skip {
  position: absolute;
  left: var(--space-2);
  top: var(--space-2);
  z-index: var(--z-skip);
  padding: 8px 14px;
  border-radius: 999px;
  background: var(--acid);
  color: var(--on-acid);
  font: 500 11px/1 var(--font-mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transform: translateY(-180%);
  transition: transform var(--duration) var(--ease);
}
.skip:focus { transform: none; }

/* --- film grain (fixed overlay, never on a scroller) ---------------------- */
.grain {
  position: fixed;
  inset: 0;
  z-index: var(--z-grain);
  pointer-events: none;
  opacity: 0.03;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='180' height='180'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");
  background-size: 180px 180px;
}

/* --- floating glass pill nav ---------------------------------------------- */
.nav-slot {
  position: sticky;
  top: 0;
  z-index: var(--z-nav);
  display: flex;
  justify-content: center;
  padding-top: 1.5rem;
  pointer-events: none;
}
.nav-pill {
  pointer-events: auto;
  width: max-content;
  max-width: calc(100vw - 32px);
  display: flex;
  align-items: center;
  gap: 1.1rem;
  padding: 0.4rem 0.45rem 0.4rem 1.2rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.58);
  backdrop-filter: blur(22px);
  -webkit-backdrop-filter: blur(22px);
  box-shadow:
    0 0 0 1px var(--hair),
    0 18px 48px -18px rgba(var(--ambient), 0.18),
    0 4px 12px -6px rgba(var(--ambient), 0.08);
}
.nav-pill .wordmark { font-size: 18px; }
.nav-label {
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-soft);
  padding: 6px 10px;
  border-radius: 999px;
  background: rgba(22, 23, 28, 0.045);
}
.nav-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 999px;
  color: var(--ink-page);
  transition: transform var(--duration) var(--ease), opacity var(--duration) var(--ease);
}
.nav-link svg { width: 14px; height: 14px; }
.nav-link:hover { transform: translateY(-1px); }
.nav-link:active { transform: scale(0.98); }

/* --- double-bezel --------------------------------------------------------- */
.bezel {
  background: rgba(22, 23, 28, 0.045);
  padding: var(--bezel-pad);
  border-radius: var(--radius-bezel);
  box-shadow:
    0 0 0 1px var(--hair),
    0 28px 80px -28px rgba(var(--ambient), 0.16),
    0 8px 24px -12px rgba(var(--ambient), 0.07);
}
.bezel-core {
  background: var(--plate);
  border-radius: var(--radius-core);
  box-shadow: inset 0 1px 1px rgba(255, 255, 255, 0.72);
}
.bezel-machine {
  padding: 0.625rem;
  background:
    linear-gradient(165deg, #fbfbfc 0%, #cfd0d6 46%, #ececf1 100%);
  box-shadow:
    0 0 0 1px rgba(22, 23, 28, 0.1),
    0 44px 110px -36px rgba(var(--ambient), 0.22),
    0 12px 32px -16px rgba(var(--ambient), 0.1),
    inset 0 1px 0 rgba(255, 255, 255, 0.88),
    inset 0 -1px 0 rgba(22, 23, 28, 0.06);
}
.bezel-core-acid {
  position: relative;
  overflow: hidden;
  background: var(--acid);
  color: var(--on-acid);
  box-shadow:
    inset 0 1px 1px rgba(255, 255, 255, 0.38),
    inset 0 -1px 0 rgba(16, 17, 13, 0.08);
}
.bezel-core-acid::after {
  content: "";
  position: absolute;
  right: -80px;
  bottom: -160px;
  width: 380px;
  height: 380px;
  border: 72px solid var(--ring-on-acid);
  border-radius: 50%;
  pointer-events: none;
}

.hover-lift {
  transition: transform var(--duration) var(--ease);
}
.hover-lift:hover { transform: translateY(-6px); }
.hover-lift:active { transform: scale(0.98); }

/* --- z-axis cascade ------------------------------------------------------- */
.tilt-neg { transform: rotate(-1.4deg); }
.tilt-pos { transform: rotate(1.8deg); }

/* --- hero ----------------------------------------------------------------- */
.hero {
  padding: 6.5rem 0 5.5rem;
}
.hero-cascade {
  position: relative;
}
.plate-title {
  width: min(78%, 920px);
  position: relative;
  z-index: 2;
}
.plate-title .bezel-core { padding: 3.1rem 3.3rem 2.9rem; }
.hero-badge {
  display: inline-flex;
  align-items: center;
  width: max-content;
  margin: 0 0 1.5rem;
  padding: 0.28rem 0.75rem;
  border-radius: 999px;
  background: rgba(22, 23, 28, 0.05);
  color: var(--ink-soft);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}
.hero-display {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(56px, 8.4vw, 128px);
  font-weight: 800;
  line-height: 0.88;
  letter-spacing: -0.075em;
}

.plate-artifact {
  width: min(340px, 88%);
  margin: -7.5rem 3% 0 auto;
  position: relative;
  z-index: 3;
}

.plate-lede {
  width: min(62%, 680px);
  margin: -2.6rem 0 0 6%;
  position: relative;
  z-index: 1;
}
.plate-lede .bezel-core { padding: 2.3rem 2.5rem 2.4rem; }
.plate-lede .type-lede { margin-bottom: 1.25rem; }
.note p { margin: 0; color: var(--ink-soft); font-size: 17px; line-height: 1.7; }
.note strong { color: var(--ink-page); font-weight: 700; }
.note .aside {
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-soft);
}

/* --- artifact (acid object, CSS-mask notches) ----------------------------- */
.artifact {
  --notch-r: 14px;
  --notch-y: 72%;
  position: relative;
  padding: var(--space-3);
  color: var(--on-acid);
  background: var(--acid);
  border-radius: var(--radius-core);
  box-shadow: inset 0 1px 1px rgba(255, 255, 255, 0.35);
  -webkit-mask-image:
    radial-gradient(circle var(--notch-r) at 0 var(--notch-y), transparent 98%, #000),
    radial-gradient(circle var(--notch-r) at 100% var(--notch-y), transparent 98%, #000);
  -webkit-mask-size: 51% 100%, 51% 100%;
  -webkit-mask-position: 0 0, 100% 0;
  -webkit-mask-repeat: no-repeat;
  mask-image:
    radial-gradient(circle var(--notch-r) at 0 var(--notch-y), transparent 98%, #000),
    radial-gradient(circle var(--notch-r) at 100% var(--notch-y), transparent 98%, #000);
  mask-size: 51% 100%, 51% 100%;
  mask-position: 0 0, 100% 0;
  mask-repeat: no-repeat;
}
.artifact-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font: 500 10px/1 var(--font-mono);
  letter-spacing: 0.16em;
  text-transform: uppercase;
}
.artifact-top svg { width: 22px; height: 22px; }
.artifact-title {
  margin: 36px 0 28px;
  font-size: 48px;
  font-weight: 800;
  letter-spacing: -0.08em;
}
.artifact-meta {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3);
  padding-block: 17px;
  box-shadow:
    inset 0 1px 0 var(--dash-on-acid),
    inset 0 -1px 0 var(--dash-on-acid);
}
.artifact-meta div { display: grid; gap: 5px; }
.artifact-meta small {
  font: 400 9px/1 var(--font-mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.artifact-meta strong {
  font: 800 13px/1 var(--font-display);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* --- catalog -------------------------------------------------------------- */
.catalog {
  display: grid;
  grid-template-columns: 228px minmax(0, 1fr);
  gap: 48px;
  align-items: start;
  padding: 1rem 0 5rem;
}

.toc {
  position: sticky;
  top: 6.25rem;
  padding: 1.15rem 1rem 1.2rem;
  border-radius: var(--radius-core);
  background: rgba(255, 255, 255, 0.48);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  box-shadow:
    0 0 0 1px var(--hair),
    0 18px 40px -24px rgba(var(--ambient), 0.16);
}
.toc-kicker {
  margin: 0 0 0.85rem 0.35rem;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-soft);
}
.toc ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}
.toc a {
  display: grid;
  grid-template-columns: 2.1rem 1fr;
  gap: 0.35rem;
  align-items: baseline;
  padding: 0.42rem 0.55rem;
  border-radius: 10px;
  color: var(--ink-soft);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1.25;
  transition: background var(--duration) var(--ease), color var(--duration) var(--ease), transform var(--duration) var(--ease);
}
.toc a .n {
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
}
.toc a:hover {
  color: var(--ink-page);
  background: rgba(22, 23, 28, 0.04);
}
.toc a.is-active {
  color: var(--ink-page);
  background: var(--plate);
  box-shadow: 0 0 0 1px var(--hair);
  transform: translateX(2px);
}
.toc a.is-active .n { color: var(--ink-page); }

.stack {
  display: grid;
  gap: 2.4rem;
  min-width: 0;
}

.specimen { position: relative; }
.specimen.is-overlap {
  width: 94%;
  margin: -1.4rem 0 0 auto;
  z-index: 2;
}
.specimen.is-inset {
  width: 92%;
  margin-left: 0;
  z-index: 1;
}

.specimen-core {
  padding: 2.15rem 2.25rem 2.2rem;
}
.specimen-head {
  display: grid;
  gap: 0.55rem;
  margin-bottom: 1.55rem;
  max-width: 46ch;
}
.specimen-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.045em;
}
.specimen-head .type-kicker { color: var(--ink-soft); }
.specimen-lede {
  margin: 0;
  color: var(--ink-soft);
  font-size: 16px;
  line-height: 1.55;
}

.demo {
  padding: 1.15rem 1.2rem 1.2rem;
  border-radius: 18px;
  background: var(--plate-recess);
  box-shadow: inset 0 0 0 1px var(--hair);
}

/* invert specimen (approval) */
.specimen-invert .specimen-core {
  padding: 2.3rem 2.4rem 2.35rem;
  position: relative;
  z-index: 1;
}
.specimen-invert .type-kicker,
.specimen-invert .invert-kicker {
  color: var(--eyebrow-on-acid);
}
.specimen-invert h2 { color: var(--on-acid); }
.specimen-invert .specimen-lede { color: var(--contact-muted); }
.specimen-invert .demo {
  background: rgba(16, 17, 13, 0.06);
  box-shadow: inset 0 0 0 1px var(--line-on-acid);
  position: relative;
  z-index: 1;
}

/* --- license / footer ----------------------------------------------------- */
.license {
  padding: 3rem 0 2rem;
}
.license-core { padding: 2.4rem 2.6rem 2.5rem; }
.license-core h2 {
  margin: 0 0 0.85rem;
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.04em;
}
.license-core .type-kicker { margin-bottom: 1.1rem; }
.license-body {
  max-width: 62ch;
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 1.7;
}
.license-body p { margin: 0 0 0.9rem; }
.license-body p:last-child { margin-bottom: 0; }
.license pre {
  margin: 1.25rem 0 0;
  padding: 1.1rem 1.2rem;
  overflow: auto;
  border-radius: 14px;
  background: var(--plate-recess);
  box-shadow: inset 0 0 0 1px var(--hair);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  line-height: 1.55;
  color: var(--ink-soft);
  white-space: pre-wrap;
}

.page-footer {
  padding: 4.5rem 0 4.5rem;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  color: var(--ink-soft);
  font: 400 10px/1.5 var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.page-footer .wordmark {
  text-transform: none;
  letter-spacing: -0.06em;
}
.page-footer p { margin: 0; }
.page-footer p:nth-of-type(1) { text-align: center; }
.page-footer p:last-child { text-align: right; }

/* --- scroll entry --------------------------------------------------------- */
@keyframes rise {
  from { opacity: 0; transform: translateY(4rem); }
  to { opacity: 1; transform: translateY(0); }
}

@media (prefers-reduced-motion: no-preference) {
  .rise-load {
    animation: rise var(--duration-slow) var(--ease) both;
  }
  .rise-load:nth-child(1) { animation-delay: 80ms; }
  .rise-load:nth-child(2) { animation-delay: 180ms; }
  .rise-load:nth-child(3) { animation-delay: 280ms; }

  .rise {
    animation: rise var(--duration-slow) var(--ease) both;
    animation-timeline: view();
    animation-range: entry 0% entry 42%;
  }
}

@supports not (animation-timeline: view()) {
  @media (prefers-reduced-motion: no-preference) {
    .rise {
      opacity: 0;
      transform: translateY(4rem);
      animation: none;
    }
    .rise.is-in {
      animation: rise var(--duration-slow) var(--ease) both;
    }
  }
}

@media (prefers-reduced-motion: reduce) {
  .skip,
  .nav-link,
  .hover-lift,
  .toc a { transition: none; }
  .rise,
  .rise-load { animation: none; }
}

/* --- 980 ----------------------------------------------------------------- */
@media (max-width: 980px) {
  .catalog {
    grid-template-columns: 1fr;
    gap: 1.4rem;
  }
  .toc {
    position: relative;
    top: 0;
    padding: 0.85rem;
  }
  .toc ol {
    display: flex;
    gap: 4px;
    overflow-x: auto;
    padding-bottom: 4px;
    scrollbar-width: none;
  }
  .toc ol::-webkit-scrollbar { display: none; }
  .toc a {
    grid-template-columns: auto;
    white-space: nowrap;
    padding: 0.45rem 0.75rem;
    background: var(--plate);
    box-shadow: 0 0 0 1px var(--hair);
    border-radius: 999px;
    font-size: 12px;
  }
  .toc a .n { display: none; }
}

/* --- 768 ----------------------------------------------------------------- */
@media (max-width: 767px) {
  .hero { padding: 5rem 0 3.5rem; }
  .plate-title,
  .plate-artifact,
  .plate-lede { width: 100%; }
  .plate-title .bezel-core,
  .plate-lede .bezel-core,
  .specimen-core,
  .license-core { padding: 1.55rem 1.3rem; }
  .hero-display { font-size: clamp(44px, 14vw, 72px); }
  .plate-artifact,
  .plate-lede { margin: 1.15rem 0 0; }
  .tilt-neg,
  .tilt-pos { transform: none; }
  .specimen.is-overlap,
  .specimen.is-inset { width: 100%; margin: 0; }
  .nav-pill { gap: 0.65rem; padding-left: 1rem; }
  .nav-label { letter-spacing: 0.1em; font-size: 8px; }
  .page-footer {
    grid-template-columns: 1fr auto;
    gap: 1.2rem;
    padding: 3.2rem 0 3rem;
  }
  .page-footer p:nth-of-type(1) { grid-area: 2 / 1 / auto / 3; text-align: left; }
  .artifact-title { font-size: 40px; }
}