/* WorkTrace landing: cinematic scroll experience.
   Newest-CSS features are used as progressive enhancement behind @supports:
   scroll-driven animations, @property, text-box trimming, view() timelines. */

@property --grad-angle {
  syntax: "<angle>";
  inherits: true;
  initial-value: 120deg;
}

:root {
  --void: oklch(0.14 0.015 260);
  --void-deep: oklch(0.10 0.012 262);
  --ink: oklch(0.95 0.008 250);
  --dim: oklch(0.72 0.02 252);
  --mint: oklch(0.85 0.14 170);
  --violet: oklch(0.75 0.14 305);
  --amber: oklch(0.82 0.12 75);
  --line: oklch(0.32 0.02 258 / 0.7);
  --font-display: "Bricolage Grotesque", system-ui, sans-serif;
  --font-body: "Instrument Sans", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--void);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1.05rem;
  line-height: 1.6;
  overflow-x: hidden;
}

/* fixed WebGL stage */
#gl {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  background: radial-gradient(120% 90% at 50% 10%, oklch(0.18 0.03 280) 0%, var(--void) 55%, var(--void-deep) 100%);
}
body.no-gl #gl { opacity: 0.9; }

/* film grain via repeating conic noise, blended */
.grain {
  position: fixed;
  inset: -50%;
  z-index: 1;
  pointer-events: none;
  opacity: 0.05;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  animation: grain-shift 0.9s steps(4) infinite;
}
@keyframes grain-shift {
  0% { transform: translate(0, 0); }
  25% { transform: translate(-2%, 1%); }
  50% { transform: translate(1%, -2%); }
  75% { transform: translate(-1%, 2%); }
  100% { transform: translate(0, 0); }
}

/* scroll progress hairline: pure CSS scroll-driven animation when supported */
.progress {
  position: fixed;
  top: 0; left: 0;
  height: 2px;
  width: 100%;
  z-index: 40;
  transform-origin: 0 50%;
  transform: scaleX(0);
  background: linear-gradient(90deg, var(--mint), var(--violet));
}
@supports (animation-timeline: scroll()) {
  .progress {
    animation: grow-progress linear both;
    animation-timeline: scroll(root);
  }
  @keyframes grow-progress { from { transform: scaleX(0); } to { transform: scaleX(1); } }
}

/* custom cursor (fine pointers only) */
#cursor { display: none; }
@media (pointer: fine) {
  #cursor { display: block; position: fixed; z-index: 60; pointer-events: none; top: 0; left: 0; }
  #cursor .dot, #cursor .ring {
    position: fixed;
    top: 0; left: 0;
    border-radius: 50%;
    translate: -50% -50%;
  }
  #cursor .dot { width: 6px; height: 6px; background: var(--mint); }
  #cursor .ring {
    width: 34px; height: 34px;
    border: 1px solid oklch(0.85 0.14 170 / 0.5);
    transition: width 200ms ease, height 200ms ease, border-color 200ms ease;
  }
  body.cursor-hover #cursor .ring { width: 56px; height: 56px; border-color: var(--violet); }
}

/* top bar */
.bar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.1rem clamp(1.25rem, 4vw, 3rem);
  mix-blend-mode: normal;
}
.wordmark .tri { color: var(--mint); }
.wordmark {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
  color: var(--ink);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}
.chip {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mint);
  border: 1px solid oklch(0.85 0.14 170 / 0.45);
  padding: 0.2rem 0.55rem;
  border-radius: 99px;
}

/* chapters */
main { position: relative; z-index: 2; }
.chapter {
  position: relative;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 14vh clamp(1.5rem, 6vw, 6rem) 10vh;
  max-width: 1200px;
  margin: 0 auto;
}
/* soft scrim keeps copy legible over the particle stage */
.chapter::before {
  content: "";
  position: absolute;
  inset: 6% 22% 6% -14%;
  z-index: -1;
  background: radial-gradient(65% 60% at 32% 50%, oklch(0.12 0.015 260 / 0.78), transparent 72%);
  pointer-events: none;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--mint);
  margin: 0 0 1.2rem;
}

h1, h2 {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 0.98;
  margin: 0 0 1.6rem;
  text-wrap: balance;
}
h1 { font-size: clamp(3.2rem, 9.5vw, 8.2rem); }
h2 { font-size: clamp(2.6rem, 7vw, 5.6rem); }
@supports (text-box: trim-both cap alphabetic) {
  h1, h2 { text-box: trim-both cap alphabetic; padding-top: 0.1em; }
}

/* animated gradient text via registered @property */
.grad {
  font-style: normal;
  background: linear-gradient(var(--grad-angle), var(--mint), var(--violet) 60%, var(--amber));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
@supports (animation-timeline: scroll()) {
  .grad {
    animation: swing-grad linear both;
    animation-timeline: scroll(root);
  }
  @keyframes swing-grad { from { --grad-angle: 60deg; } to { --grad-angle: 300deg; } }
}

.lede {
  font-size: clamp(1.05rem, 1.6vw, 1.3rem);
  color: var(--dim);
  max-width: 34em;
  margin: 0 0 2.2rem;
  text-wrap: pretty;
}

/* buttons */
.btn {
  display: inline-block;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--ink);
  text-decoration: none;
  padding: 0.85rem 1.6rem;
  border-radius: 99px;
  border: 1px solid var(--line);
  background: oklch(0.2 0.02 258 / 0.5);
  backdrop-filter: blur(10px);
  transition: border-color 200ms ease, background 200ms ease, translate 200ms ease;
  will-change: transform;
}
.btn:hover { border-color: var(--mint); }
.btn-primary {
  background: linear-gradient(120deg, var(--mint), oklch(0.8 0.14 200));
  color: oklch(0.2 0.04 200);
  border-color: transparent;
}
.btn-primary:hover { filter: brightness(1.08); }
.btn-small { padding: 0.5rem 1.05rem; font-size: 0.85rem; }
.btn-big { padding: 1.1rem 2.4rem; font-size: 1.1rem; }
.cta-row { display: flex; gap: 0.9rem; flex-wrap: wrap; }

.scroll-cue {
  position: absolute;
  bottom: 4vh;
  left: 50%;
  translate: -50%;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--dim);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.6rem;
}
.scroll-cue span {
  width: 1px; height: 44px;
  background: linear-gradient(var(--mint), transparent);
  animation: cue 1.8s ease-in-out infinite;
}
@keyframes cue { 0%, 100% { transform: scaleY(0.4); opacity: 0.4; } 50% { transform: scaleY(1); opacity: 1; } }
.hero { position: relative; }

/* figures: editorial display numbers */
.figures {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 2.2rem 2.6rem;
  margin-top: 1.2rem;
}
.figure b {
  display: block;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.2rem, 4.2vw, 3.6rem);
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  background: linear-gradient(120deg, var(--mint), var(--violet));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.figure i {
  font-style: normal;
  color: var(--dim);
  font-size: 0.9rem;
  display: block;
  max-width: 22em;
  margin-top: 0.3rem;
}

/* glass cards */
.glass {
  background: oklch(0.2 0.02 258 / 0.42);
  border: 1px solid oklch(0.35 0.02 258 / 0.5);
  border-radius: 1.1rem;
  backdrop-filter: blur(14px);
}
.steps, .verticals {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.1rem;
  margin-top: 0.8rem;
}
.step, .vertical { padding: 1.5rem 1.5rem 1.3rem; transition: translate 300ms ease, border-color 300ms ease; }
.step:hover, .vertical:hover { translate: 0 -6px; border-color: oklch(0.85 0.14 170 / 0.5); }
.step .num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--mint);
  letter-spacing: 0.2em;
}
.step h3, .vertical h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.5rem;
  letter-spacing: -0.02em;
  margin: 0.55rem 0 0.5rem;
}
.step p, .vertical p { color: var(--dim); font-size: 0.95rem; margin: 0; }

.aside { margin-top: 2rem; color: var(--dim); font-size: 0.95rem; max-width: 44em; }
.aside a { color: var(--mint); text-decoration: none; }
.aside a:hover { text-decoration: underline; }

/* manifest list */
.manifest {
  list-style: none;
  margin: 0.4rem 0 0;
  padding: 0;
  max-width: 620px;
}
.manifest li {
  font-size: clamp(1.05rem, 1.7vw, 1.35rem);
  padding: 1.05rem 0;
  border-bottom: 1px solid var(--line);
  position: relative;
  padding-left: 2rem;
}
.manifest li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.75rem;
  width: 9px; height: 9px;
  border-radius: 50%;
  background: linear-gradient(120deg, var(--mint), var(--violet));
}
.kicker {
  margin-top: 2.4rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.4rem, 2.6vw, 2rem);
  letter-spacing: -0.02em;
}

/* film */
.film-frame {
  padding: 0.8rem;
  max-width: 900px;
}
.film-frame video { width: 100%; display: block; border-radius: 0.6rem; }

/* finale */
.finale { text-align: center; align-items: center; }
.finale .lede { margin-inline: auto; }

.foot {
  position: relative;
  z-index: 2;
  text-align: center;
  color: var(--dim);
  font-size: 0.82rem;
  padding: 2rem 1rem 3rem;
  font-family: var(--font-mono);
}

/* reveal choreography: JS adds .inview; motion-safe only */
@media (prefers-reduced-motion: no-preference) {
  .reveal {
    opacity: 0;
    translate: 0 28px;
    transition: opacity 700ms ease, translate 700ms cubic-bezier(0.2, 0.7, 0.2, 1);
  }
  .reveal.inview { opacity: 1; translate: 0 0; }
  .reveal:nth-child(2) { transition-delay: 60ms; }
  .reveal:nth-child(3) { transition-delay: 120ms; }
  .reveal:nth-child(4) { transition-delay: 180ms; }
}
@media (prefers-reduced-motion: reduce) {
  .grain, .scroll-cue span { animation: none; }
  html { scroll-behavior: auto; }
}

@media (max-width: 900px) {
  /* narrow viewports: text spans the full width, so the scrim must too */
  .chapter::before {
    inset: 4% -10% 4% -10%;
    background: radial-gradient(80% 70% at 50% 50%, oklch(0.12 0.015 260 / 0.85), transparent 78%);
  }
}
@media (max-width: 640px) {
  .chapter { padding-top: 18vh; }
  .cta-row .btn { width: 100%; text-align: center; }
}