/* ===================================================================
   Praxilogue — design tokens
   Dual type system: Fraunces (serif, human) carries prose and headlines;
   IBM Plex Mono (machine) carries structural chrome — the ∴ mark, indices,
   the rail. The pairing is the argument in miniature.

   The page is a sequence of full-viewport scenes, not a scroll. Each scene
   carries its own color valence (a hue) that the whole page's accent shifts
   toward as you arrive — a quiet nod to the studio's own Valence piece.
=================================================================== */

@property --hue {
  syntax: '<number>';
  inherits: true;
  initial-value: 200;
}

:root {
  --hue: 200;
  --bg: #0e0d0b;
  --bg-raised: #17150f;
  --text: #ede7da;
  --text-dim: #a89f8c;
  --text-faint: #6b6455;
  --accent: hsl(var(--hue) 78% 68%);
  --accent-dim: hsl(var(--hue) 50% 48%);
  --rule: rgba(237, 231, 218, 0.13);
  --rule-strong: rgba(237, 231, 218, 0.22);

  --font-serif: "Fraunces", Georgia, "Times New Roman", serif;
  --font-mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;

  --measure: 38rem;
  --measure-wide: 56rem;
  --edge-pad: clamp(1.5rem, 6vw, 3.25rem);
  --rail-width: 84px;
  color-scheme: dark;
  transition: --hue 0.9s cubic-bezier(0.22, 1, 0.36, 1);
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f6f1e6;
    --bg-raised: #ece3d0;
    --text: #211f19;
    --text-dim: #55503f;
    --text-faint: #8b8570;
    --accent: hsl(var(--hue) 74% 35%);
    --accent-dim: hsl(var(--hue) 50% 46%);
    --rule: rgba(33, 31, 25, 0.14);
    --rule-strong: rgba(33, 31, 25, 0.24);
    color-scheme: light;
  }
}

* { box-sizing: border-box; }

html {
  background: var(--bg);
  scroll-behavior: smooth;
  scroll-snap-type: y proximity;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-serif);
  font-optical-sizing: auto;
  font-size: 1.0625rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

::selection {
  background: var(--accent);
  color: var(--bg);
}

/* ---------------------------------------------------------------
   Grain + ambient glow — the glow's hue tracks the active scene
--------------------------------------------------------------- */

.grain {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  opacity: 0.05;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

.glow {
  position: fixed;
  top: -25%;
  left: 5%;
  width: 65vw;
  height: 65vw;
  max-width: 950px;
  max-height: 950px;
  background: radial-gradient(circle, var(--accent) 0%, transparent 68%);
  opacity: 0.12;
  filter: blur(10px);
  pointer-events: none;
  z-index: 0;
  transition: opacity 0.6s ease;
}

/* ---------------------------------------------------------------
   Rail — persistent left chrome: mark, scene navigator, foot mark.
   Collapses to a top bar on narrow viewports.
--------------------------------------------------------------- */

.rail {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--rail-width);
  height: 100vh;
  z-index: 20;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 1.75rem 0 1.5rem;
  border-right: 1px solid var(--rule);
}

.mark {
  color: var(--accent);
  display: flex;
  align-items: center;
  opacity: 0.9;
  transition: opacity 0.2s ease, transform 0.2s ease, color 0.6s ease;
}
.mark:hover { opacity: 1; transform: scale(1.1); }
.mark svg circle { fill: currentColor; }

.scene-nav {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.35rem;
  margin: auto 0;
}

.scene-nav-item {
  appearance: none;
  background: none;
  border: none;
  padding: 0.15rem 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-variant-numeric: tabular-nums;
  color: var(--text-faint);
  cursor: pointer;
  transition: color 0.4s ease, transform 0.3s ease;
}
.scene-nav-item:hover { color: var(--text-dim); }
.scene-nav-item[aria-current="true"] {
  color: var(--accent);
  transform: scale(1.25);
}
.scene-nav-item:focus-visible {
  outline: 1px solid var(--accent);
  outline-offset: 4px;
}

.rail-foot {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-faint);
  opacity: 0.5;
}

@media (max-width: 720px) {
  :root { --rail-width: 0px; }
  .rail {
    flex-direction: row;
    justify-content: space-between;
    width: 100%;
    height: 48px;
    top: 0; left: 0;
    padding: 0 1.1rem;
    border-right: none;
    border-bottom: 1px solid var(--rule);
    background: color-mix(in srgb, var(--bg) 88%, transparent);
    backdrop-filter: blur(6px);
  }
  .scene-nav {
    flex-direction: row;
    margin: 0;
    gap: 1.1rem;
  }
  .rail-foot { display: none; }
  main { padding-top: 48px; }
}

/* ---------------------------------------------------------------
   Scenes — full-viewport beats, not a scroll. Each carries a hue
   consumed by JS on arrival (see script.js) to shift --hue globally.
--------------------------------------------------------------- */

main {
  position: relative;
  z-index: 2;
  margin-left: var(--rail-width);
}

.scene {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  scroll-snap-align: start;
  scroll-snap-stop: always;
  padding: clamp(2rem, 6vh, 4rem) 0;
}

.scene--hero,
.scene--augmentation,
.scene--governance {
  justify-content: safe center;
}

.scene--methodologies,
.scene--projects {
  justify-content: flex-start;
  padding-top: clamp(5.5rem, 14vh, 8rem);
}

.scene-inner {
  width: 100%;
  max-width: var(--measure);
  margin: 0 auto;
  padding: 0 var(--edge-pad);
}

.scene-inner--wide { max-width: var(--measure-wide); }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.6em;
  transition: color 0.6s ease;
}

.eyebrow-index { display: inline-block; font-variant-numeric: tabular-nums; }

h1, h2 {
  font-family: var(--font-serif);
  font-weight: 500;
  line-height: 1.14;
  letter-spacing: -0.015em;
  margin: 0 0 1.75rem;
  color: var(--text);
}

h1.hero-head {
  font-size: clamp(2.5rem, 7vw, 4.2rem);
  font-weight: 400;
}

h2 {
  font-size: clamp(1.65rem, 3.8vw, 2.3rem);
  font-style: italic;
  font-weight: 400;
}

p { margin: 0 0 1.25rem; }
p:last-child { margin-bottom: 0; }

.lede {
  color: var(--text-dim);
  font-size: 1.13rem;
  max-width: 34rem;
}

.split-body p {
  color: var(--text-dim);
  max-width: 32rem;
}

/* ---------------------------------------------------------------
   Hero mask-reveal — headline lines slide up out of a clipped
   wrapper on load. Pure CSS, not scroll-gated.
--------------------------------------------------------------- */

.line-mask { display: block; overflow: hidden; }
.line-inner {
  display: block;
  transform: translateY(105%);
  animation: rise 0.9s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}
.line-mask:nth-child(1) .line-inner { animation-delay: 0.05s; }
.line-mask:nth-child(2) .line-inner { animation-delay: 0.18s; }

@keyframes rise { to { transform: translateY(0); } }

.scroll-cue {
  appearance: none;
  background: none;
  border: none;
  cursor: pointer;
  margin-top: 3.5rem;
  padding: 0;
  display: flex;
  align-items: center;
  gap: 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--text-faint);
  transition: color 0.3s ease, gap 0.3s ease;
}
.scroll-cue:hover { color: var(--accent); gap: 1rem; }
.scroll-cue-num { font-variant-numeric: tabular-nums; }
.scroll-cue-line {
  width: 34px;
  height: 1px;
  background: linear-gradient(90deg, var(--text-faint), var(--accent));
  position: relative;
  overflow: hidden;
}
.scroll-cue-line::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--accent);
  transform: translateX(-100%);
  animation: sweep 2.2s ease-in-out infinite;
}
@keyframes sweep {
  0% { transform: translateX(-100%); }
  50% { transform: translateX(0); }
  100% { transform: translateX(100%); }
}

/* ---------------------------------------------------------------
   Scene-mark — the recurring ∴, framed as a logical step between
   numbered scenes: 01 ∴ 02. Sits at the base of a scene.
--------------------------------------------------------------- */

.scene-mark {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.9rem;
  margin-top: clamp(2.5rem, 6vh, 4rem);
}
.d-num {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-faint);
  font-variant-numeric: tabular-nums;
}
.d-mark {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--accent-dim);
  transition: color 0.6s ease;
}

.closing-mark {
  text-align: center;
  font-family: var(--font-mono);
  color: var(--accent);
  opacity: 0.5;
  font-size: 1.8rem;
  margin: clamp(2rem, 5vh, 3rem) 0 1.5rem;
  transition: color 0.6s ease;
}

/* ---------------------------------------------------------------
   Methodologies — a triptych, not a bulleted list
--------------------------------------------------------------- */

.triptych {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0 2.75rem;
}

.entry { padding: 0; }
.entry + .entry { border-left: 1px solid var(--rule); padding-left: 2.75rem; margin-left: -2.75rem; }

.entry-name {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  color: var(--text);
  margin: 0 0 0.75rem;
}

.entry-body { color: var(--text-dim); }

@media (max-width: 860px) {
  .triptych { grid-template-columns: 1fr; gap: 2rem 0; }
  .entry + .entry { border-left: none; padding-left: 0; margin-left: 0; border-top: 1px solid var(--rule); padding-top: 1.75rem; }
}

/* ---------------------------------------------------------------
   Split layout — headline | prose, used by Augmentation & Governance
--------------------------------------------------------------- */

.split {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 3rem;
  align-items: start;
}
.split h2 { margin-bottom: 0; }

@media (max-width: 780px) {
  .split { grid-template-columns: 1fr; gap: 1.5rem; }
}

/* ---------------------------------------------------------------
   Projects — an indexed editorial list with a hover sweep
--------------------------------------------------------------- */

.project-list { list-style: none; margin: 2.5rem 0 0; padding: 0; }

.project {
  position: relative;
  display: flex;
  gap: 1.4rem;
  padding: 1.35rem 1.2rem;
  margin: 0 -1.2rem;
  border-top: 1px solid var(--rule);
  border-radius: 4px;
  transition: background-color 0.35s ease;
}
.project:last-child { border-bottom: 1px solid var(--rule); }
.project:hover { background: color-mix(in srgb, var(--accent) 6%, transparent); }

.project-idx {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-faint);
  padding-top: 0.2rem;
  flex-shrink: 0;
  font-variant-numeric: tabular-nums;
}

.project-body { flex: 1; min-width: 0; }

.project-name, .project-name--static {
  display: inline-flex;
  align-items: baseline;
  gap: 0.45em;
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text);
  text-decoration: none;
  margin: 0 0 0.45rem;
}

a.project-name {
  background-image: linear-gradient(var(--accent), var(--accent));
  background-repeat: no-repeat;
  background-position: 0 100%;
  background-size: 0% 1px;
  transition: background-size 0.3s ease, color 0.3s ease, transform 0.3s ease;
}
.project:hover a.project-name { color: var(--accent); background-size: 100% 1px; }

.project-arrow { font-size: 0.8em; opacity: 0.6; transition: transform 0.3s ease, opacity 0.3s ease; }
.project:hover .project-arrow { transform: translate(3px, -3px); opacity: 1; }

.project-tag {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 400;
  color: var(--text-faint);
  border: 1px solid var(--rule-strong);
  border-radius: 3px;
  padding: 0.15em 0.5em;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.project-desc { color: var(--text-dim); max-width: 30rem; margin: 0; font-size: 0.98rem; }

/* ---------------------------------------------------------------
   Colophon
--------------------------------------------------------------- */

.colophon {
  margin-top: clamp(2rem, 6vh, 3.5rem);
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-faint);
}
.mark-inline { color: var(--accent-dim); display: inline-flex; transition: color 0.6s ease; }
.mark-inline svg circle { fill: currentColor; }

/* ---------------------------------------------------------------
   Reveal-on-scroll, staggered
--------------------------------------------------------------- */

.reveal {
  opacity: 0;
  transform: translateY(16px) scale(0.99);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.in-view { opacity: 1; transform: translateY(0) scale(1); }

.triptych .entry:nth-child(1) { transition-delay: 0ms; }
.triptych .entry:nth-child(2) { transition-delay: 90ms; }
.triptych .entry:nth-child(3) { transition-delay: 180ms; }

.project-list .project:nth-child(1) { transition-delay: 0ms; }
.project-list .project:nth-child(2) { transition-delay: 60ms; }
.project-list .project:nth-child(3) { transition-delay: 120ms; }
.project-list .project:nth-child(4) { transition-delay: 180ms; }
.project-list .project:nth-child(5) { transition-delay: 240ms; }

@media (prefers-reduced-motion: reduce) {
  .reveal, .line-inner { opacity: 1; transform: none; transition: none; animation: none; }
  .scroll-cue-line::after { animation: none; }
  html { scroll-behavior: auto; scroll-snap-type: none; }
  :root { transition: none; }
}