/* ─────────────────────────────────────────────
   addisonwbrown.com — design system
   paper / ink / one vermilion, borrowed from the truck
   ───────────────────────────────────────────── */

:root {
  --paper: #f2eee6;
  --paper-2: #e8e3d8;
  --ink: #151412;
  --ink-2: #4a4742;
  --ink-3: #8b877f;
  --line: rgba(21, 20, 18, 0.16);
  --accent: #c43e2a;

  --bg: var(--paper);
  --fg: var(--ink);
  --fg-2: var(--ink-2);
  --fg-3: var(--ink-3);

  --serif: 'Fraunces', 'Iowan Old Style', 'Palatino Linotype', Georgia, serif;
  --sans: 'Instrument Sans', 'Helvetica Neue', Helvetica, Arial, sans-serif;
  --mono: 'DM Mono', ui-monospace, 'SF Mono', Menlo, monospace;

  --gutter: clamp(1.25rem, 4.5vw, 4.5rem);
  --col: minmax(0, 1fr);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.77, 0, 0.175, 1);
  --head-h: 4.25rem;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: auto; }
html.lenis, html.lenis body { height: auto; }
.lenis.lenis-smooth { scroll-behavior: auto !important; }
.lenis.lenis-stopped { overflow: hidden; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.6;
  font-feature-settings: 'kern', 'liga', 'ss01';
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: clip;
}

img, picture { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
em { font-style: italic; }
::selection { background: var(--accent); color: var(--paper); }

/* grain */
.grain-src { position: absolute; width: 0; height: 0; }
.grain {
  position: fixed; inset: -50%; width: 200%; height: 200%;
  pointer-events: none; z-index: 9000;
  filter: url(#grain);
  opacity: 0.045;
  mix-blend-mode: multiply;
  animation: grain 0.9s steps(4) infinite;
}
@keyframes grain {
  0% { transform: translate(0, 0); }
  25% { transform: translate(-2%, 1%); }
  50% { transform: translate(1%, -2%); }
  75% { transform: translate(-1%, 2%); }
  100% { transform: translate(2%, -1%); }
}

/* ── type ── */
.meta {
  font-family: var(--mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  line-height: 1.4;
  color: var(--fg-3);
}

/* ── header ── */
.head {
  position: fixed; inset: 0 0 auto 0; z-index: 1000;
  height: var(--head-h);
  padding: 0 var(--gutter);
  display: grid; grid-template-columns: 1fr auto 1fr; align-items: center;
  mix-blend-mode: difference; color: #fff;
  transition: transform 0.6s var(--ease-out);
}
.head.is-hidden { transform: translateY(-100%); }
.head__name {
  font-family: var(--serif); font-weight: 400; font-size: 1.05rem; letter-spacing: -0.005em;
  font-variation-settings: 'opsz' 32;
}
.head__now {
  display: flex; gap: 0.9em; align-items: baseline; justify-content: center;
  font-family: var(--mono); font-size: 0.6875rem; letter-spacing: 0.12em; text-transform: uppercase;
  opacity: 0; transform: translateY(0.4em);
  transition: opacity 0.6s var(--ease-out), transform 0.6s var(--ease-out);
}
.head__now.is-on { opacity: 0.75; transform: none; }
.head__now-num::after { content: ''; display: inline-block; width: 1.5em; height: 1px; background: currentColor; vertical-align: middle; margin-left: 0.9em; opacity: 0.6; }
.head__index {
  justify-self: end;
  font-family: var(--mono); font-size: 0.6875rem; letter-spacing: 0.12em; text-transform: uppercase;
  position: relative; padding-bottom: 2px;
}
.head__index::after { content: ''; position: absolute; left: 0; right: 0; bottom: 0; height: 1px; background: currentColor; transform: scaleX(0); transform-origin: right; transition: transform 0.5s var(--ease-out); }
.head__index:hover::after { transform: scaleX(1); transform-origin: left; }

/* ── rail ── */
.rail {
  position: fixed; left: calc(var(--gutter) * 0.3); top: 50%; transform: translateY(-50%);
  z-index: 900; height: 32vh; display: flex; gap: 0.9rem; align-items: stretch;
  mix-blend-mode: difference; color: #fff;
  opacity: 0; transition: opacity 0.8s var(--ease-out);
}
.rail.is-on { opacity: 1; }
.rail__line { width: 1px; background: rgba(255,255,255,0.22); position: relative; }
.rail__fill { position: absolute; left: 0; top: 0; width: 100%; height: 100%; background: currentColor; transform-origin: top; transform: scaleY(0); }
.rail__year { writing-mode: vertical-rl; font-family: var(--mono); font-size: 0.6875rem; letter-spacing: 0.14em; text-transform: uppercase; opacity: 0.75; display: flex; align-items: flex-start; }
.rail__year span { display: block; }
@media (max-width: 1200px) { .rail { display: none; } }
@media (max-width: 700px) { .head { grid-template-columns: 1fr auto; } .head__now { display: none; } .hero__meta .meta:last-child { display: none; } }

/* ── hero ── */
.hero {
  min-height: 100svh; padding: calc(var(--head-h) + 1rem) var(--gutter) clamp(1.5rem, 4vh, 3rem);
  display: grid; grid-template-rows: auto 1fr auto;
}
.hero__meta { display: flex; justify-content: space-between; }
.hero__name {
  margin: 0; align-self: center;
  font-family: var(--serif); font-weight: 300;
  font-size: clamp(3.75rem, 14.5vw, 14rem);
  line-height: 0.88; letter-spacing: -0.035em;
  font-variation-settings: 'opsz' 144;
}
.hero__name .line { display: block; overflow: hidden; padding: 0.04em 0.03em; margin: -0.04em -0.03em; }
.hero__name .line > span { display: block; }
.hero__name .line:nth-child(2) { padding-left: clamp(0px, 12vw, 14rem); }
.hero__foot { display: grid; grid-template-columns: minmax(0, 28rem) 1fr; align-items: end; gap: 2rem; }
.hero__dek { margin: 0; font-family: var(--serif); font-weight: 300; font-style: italic; font-size: clamp(1.2rem, 1.9vw, 1.6rem); line-height: 1.3; letter-spacing: -0.01em; font-variation-settings: 'opsz' 40; color: var(--fg-2); }
.hero__cue { justify-self: end; display: flex; align-items: center; gap: 1rem; }
.hero__cue-line { width: 3.5rem; height: 1px; background: var(--fg); transform-origin: left; transition: transform 0.6s var(--ease-out); }
.hero__cue:hover .hero__cue-line { transform: scaleX(1.4); }
@media (max-width: 700px) {
  .hero__foot { grid-template-columns: 1fr; }
  .hero__cue { justify-self: start; }
  .hero__name .line:nth-child(2) { padding-left: 0.9em; }
}

/* ── chapter opener ── */
.chapter { position: relative; }
.ch-open { padding: clamp(6rem, 18vh, 12rem) var(--gutter) clamp(3rem, 8vh, 5rem); display: grid; grid-template-columns: repeat(12, var(--col)); column-gap: 1.5rem; row-gap: 2.5rem; border-top: 1px solid var(--line); }
.ch-open__meta { grid-column: 1 / -1; display: flex; gap: 2.5rem; flex-wrap: wrap; }
.ch-open__title { grid-column: 1 / span 10; margin: 0; font-family: var(--serif); font-weight: 300; font-size: clamp(3rem, 9vw, 8.5rem); line-height: 0.92; letter-spacing: -0.035em; font-variation-settings: 'opsz' 144; }
.ch-open__dek { grid-column: 7 / span 6; margin: 0; font-family: var(--serif); font-style: italic; font-weight: 300; font-size: clamp(1.3rem, 2.1vw, 1.85rem); line-height: 1.3; letter-spacing: -0.01em; font-variation-settings: 'opsz' 40; color: var(--fg-2); }
@media (max-width: 900px) { .ch-open__dek { grid-column: 1 / -1; } }

/* ── figures ── */
.fig { margin: 0; }
.fig__frame { position: relative; aspect-ratio: var(--ar, 4/3); overflow: hidden; background: var(--tint, var(--paper-2)); clip-path: inset(0 0 0 0); }
.fig__frame picture { height: 100%; }
.fig__frame img { width: 100%; height: 100%; object-fit: cover; will-change: transform; }
.fig__cap { display: flex; gap: 1.5rem; align-items: baseline; padding: 0.9rem var(--gutter) 0; font-size: 0.875rem; color: var(--fg-2); max-width: 44rem; }
.fig__cap .meta { flex: none; }
.fig--bleed { padding: 0; }
.fig--bleed .fig__frame { aspect-ratio: auto; height: clamp(60vh, 110vw, 92vh); }

/* reveal states (JS removes) */
.js .fig__frame[data-reveal] { clip-path: inset(100% 0 0 0); }
.js .fig__frame[data-reveal] img { transform: scale(1.18); }

/* ── prose ── */
.prose { padding: clamp(4rem, 10vh, 8rem) var(--gutter); display: grid; grid-template-columns: repeat(12, var(--col)); column-gap: 1.5rem; }
.prose > p { grid-column: 5 / span 6; margin: 0 0 1.5em; font-size: clamp(1.0625rem, 1.35vw, 1.25rem); line-height: 1.55; color: var(--fg-2); }
.prose > p:last-child { margin-bottom: 0; }
.prose__lead { font-family: var(--serif); font-weight: 300; font-size: clamp(1.5rem, 2.6vw, 2.4rem) !important; line-height: 1.2 !important; letter-spacing: -0.02em; color: var(--fg) !important; font-variation-settings: 'opsz' 72; grid-column: 3 / span 9 !important; margin-bottom: 1em !important; }
.prose > p em { font-style: italic; color: var(--fg); }
@media (max-width: 900px) { .prose > p, .prose__lead { grid-column: 1 / -1 !important; } }

/* ── strip ── */
.strip { padding: 0 var(--gutter); display: grid; grid-template-columns: repeat(12, var(--col)); column-gap: 1.5rem; row-gap: 1rem; align-items: start; }
.strip__item { grid-column: span 4; }
.strip__item:nth-child(1) { margin-top: 8vh; }
.strip__item:nth-child(3) { margin-top: 14vh; }
.strip__cap { grid-column: 1 / -1; padding-left: 0; padding-right: 0; }
@media (max-width: 800px) {
  .strip { grid-template-columns: 1fr; row-gap: 1.5rem; }
  .strip__item { grid-column: 1 / -1; margin-top: 0 !important; }
  .strip__item:nth-child(2) { width: 80%; justify-self: end; }
  .strip__item:nth-child(3) { width: 80%; }
}

/* ── ledger ── */
.ledger { margin: clamp(3rem, 8vh, 6rem) var(--gutter) 0; padding: 2.5rem 0 0; border-top: 1px solid var(--line); display: grid; grid-template-columns: repeat(12, var(--col)); column-gap: 1.5rem; row-gap: 2.5rem; }
.ledger__item { grid-column: span 4; display: grid; grid-template-columns: auto auto 1fr; grid-template-rows: auto auto; align-items: baseline; column-gap: 0.25em; }
.ledger__num { font-family: var(--serif); font-weight: 300; font-size: clamp(3rem, 6vw, 5.5rem); line-height: 1; letter-spacing: -0.035em; font-variation-settings: 'opsz' 144; font-variant-numeric: tabular-nums; }
.ledger__num--text { font-style: italic; }
.ledger__unit { font-family: var(--serif); font-weight: 300; font-style: italic; font-size: clamp(1.4rem, 2.4vw, 2.2rem); letter-spacing: -0.01em; color: var(--fg-2); }
.ledger__unit--pre { order: -1; }
.ledger__label { grid-column: 1 / -1; margin-top: 0.6rem; font-size: 0.9375rem; color: var(--fg-2); max-width: 16em; }
.ledger--dark .ledger__item { grid-column: span 3; }
@media (max-width: 900px) { .ledger__item, .ledger--dark .ledger__item { grid-column: span 6; } }
@media (max-width: 560px) { .ledger__item, .ledger--dark .ledger__item { grid-column: 1 / -1; } }

/* ── project (inverted) ── */
.project {
  --bg: var(--ink); --fg: var(--paper); --fg-2: rgba(242,238,230,0.72); --fg-3: rgba(242,238,230,0.5); --line: rgba(242,238,230,0.18);
  background: var(--bg); color: var(--fg);
  margin-top: clamp(5rem, 14vh, 10rem);
  padding: clamp(5rem, 14vh, 10rem) 0 clamp(5rem, 12vh, 9rem);
}
.project__head { padding: 0 var(--gutter); display: grid; grid-template-columns: repeat(12, var(--col)); column-gap: 1.5rem; row-gap: 2rem; }
.project__head .meta { grid-column: 1 / -1; }
.project__title { grid-column: 1 / span 8; margin: 0; font-family: var(--serif); font-weight: 300; font-style: italic; font-size: clamp(3rem, 8vw, 7.5rem); line-height: 0.95; letter-spacing: -0.03em; font-variation-settings: 'opsz' 144; }
.project__dek { grid-column: 6 / span 6; margin: 0; font-size: clamp(1.0625rem, 1.35vw, 1.25rem); line-height: 1.55; color: var(--fg-2); }
.project__dek em { color: var(--fg); }
@media (max-width: 900px) { .project__dek { grid-column: 1 / -1; } }

/* scrollytelling */
.story { margin-top: clamp(4rem, 10vh, 8rem); padding: 0 var(--gutter); display: grid; grid-template-columns: repeat(12, var(--col)); column-gap: 1.5rem; }
.story__stage { grid-column: 1 / span 7; position: sticky; top: 0; height: 100svh; display: grid; align-content: center; padding: 4rem 0; }
.story__stack { position: relative; aspect-ratio: 4/5; max-height: calc(100svh - 8rem); width: 100%; overflow: hidden; background: var(--tint, #222); }
.story__img { position: absolute; inset: 0; background: var(--tint); opacity: 0; transition: opacity 0.9s var(--ease-in-out); }
.story__img picture { height: 100%; }
.story__img img { width: 100%; height: 100%; object-fit: cover; transform: scale(1.06); transition: transform 1.6s var(--ease-out); }
.story__img.is-active { opacity: 1; z-index: 2; }
.story__img.is-active img { transform: scale(1); }
.story__counter { position: absolute; left: 0; bottom: 1.5rem; display: flex; gap: 0.5em; font-family: var(--mono); font-size: 0.6875rem; letter-spacing: 0.14em; color: var(--fg-3); }
.story__counter-cur { color: var(--fg); }
.story__steps { grid-column: 9 / span 4; list-style: none; margin: 0; padding: 0; }
.story__step { min-height: 100svh; display: grid; align-content: center; gap: 1.25rem; }
.story__step p { margin: 0; font-family: var(--serif); font-weight: 300; font-size: clamp(1.4rem, 2.1vw, 1.9rem); line-height: 1.25; letter-spacing: -0.015em; font-variation-settings: 'opsz' 48; opacity: 0.3; transition: opacity 0.6s var(--ease-out); }
.story__step.is-active p { opacity: 1; }
@media (max-width: 900px) {
  .story { display: block; }
  .story__stage { position: sticky; top: 0; height: auto; padding: 0 0 1.5rem; background: var(--bg); z-index: 1; }
  .story__stack { aspect-ratio: 4/3; max-height: 56svh; }
  .story__counter { position: static; padding-top: 0.75rem; }
  .story__step { min-height: 48svh; padding: 0.5rem 0; }
  .story__step:last-child { min-height: 40svh; }
}

.statement { margin: clamp(5rem, 14vh, 10rem) var(--gutter) 0; max-width: 22ch; font-family: var(--serif); font-weight: 300; font-style: italic; font-size: clamp(1.9rem, 4.2vw, 3.9rem); line-height: 1.12; letter-spacing: -0.02em; font-variation-settings: 'opsz' 96; }

/* ── lesson ── */
.lesson { padding: clamp(6rem, 16vh, 11rem) var(--gutter); display: grid; grid-template-columns: repeat(12, var(--col)); column-gap: 1.5rem; row-gap: 2rem; }
.lesson .meta { grid-column: 1 / -1; }
.lesson__main { grid-column: 1 / span 10; margin: 0; font-family: var(--serif); font-weight: 300; font-size: clamp(2.2rem, 5.4vw, 5rem); line-height: 1.04; letter-spacing: -0.03em; font-variation-settings: 'opsz' 144; }
.lesson__sub { grid-column: 5 / span 7; margin: 0; font-family: var(--serif); font-style: italic; font-weight: 300; font-size: clamp(1.3rem, 2.1vw, 1.85rem); line-height: 1.3; letter-spacing: -0.01em; color: var(--fg-2); font-variation-settings: 'opsz' 40; }
@media (max-width: 900px) { .lesson__sub { grid-column: 1 / -1; } }

/* ── next / foot ── */
.next { border-top: 1px solid var(--line); padding: clamp(4rem, 10vh, 7rem) var(--gutter); display: grid; gap: 1.5rem; }
.next__meta { display: flex; gap: 2.5rem; }
.next__title { margin: 0; font-family: var(--serif); font-weight: 300; font-style: italic; font-size: clamp(2rem, 5vw, 4.5rem); letter-spacing: -0.03em; line-height: 1; color: var(--fg-3); font-variation-settings: 'opsz' 144; }
.foot { padding: 2rem var(--gutter) 2.5rem; display: flex; justify-content: space-between; border-top: 1px solid var(--line); }

/* ── index overlay ── */
.index { position: fixed; inset: 0; z-index: 1100; background: var(--ink); color: var(--paper); --fg-3: rgba(242,238,230,0.5); --line: rgba(242,238,230,0.18); clip-path: inset(0 0 100% 0); transition: clip-path 0.9s var(--ease-in-out); visibility: hidden; }
.index.is-open { clip-path: inset(0 0 0 0); visibility: visible; }
.index__inner { height: 100%; padding: 0 var(--gutter) 3rem; display: grid; grid-template-rows: var(--head-h) 1fr; }
.index__head { display: flex; justify-content: space-between; align-items: center; }
.index__close { font-family: var(--mono); font-size: 0.6875rem; letter-spacing: 0.12em; text-transform: uppercase; }
.index__list { list-style: none; margin: 0; padding: 0; align-self: center; }
.index__list li { border-top: 1px solid var(--line); }
.index__list li:last-child { border-bottom: 1px solid var(--line); }
.index__list a, .index__list li.is-soon { display: grid; grid-template-columns: 4rem 1fr auto; align-items: baseline; gap: 2rem; padding: 1.5rem 0; transition: padding-left 0.5s var(--ease-out); }
.index__list a:hover { padding-left: 1rem; }
.index__title { font-family: var(--serif); font-weight: 300; font-size: clamp(1.8rem, 4.5vw, 3.8rem); letter-spacing: -0.03em; line-height: 1; font-variation-settings: 'opsz' 144; }
.index__list li.is-soon .index__title { font-style: italic; color: var(--fg-3); }

/* ── text reveal primitives ── */
.js .hero__name, .js .hero__meta, .js .hero__dek, .js .hero__cue { visibility: hidden; }
.js [data-reveal-text] { visibility: hidden; }
.js [data-rise] { opacity: 0; transform: translateY(1.2rem); }

@media (prefers-reduced-motion: reduce) {
  .grain { animation: none; }
  .js .fig__frame[data-reveal] { clip-path: none; }
  .js .fig__frame[data-reveal] img { transform: none; }
  .js [data-reveal-text] { visibility: visible; }
  .js [data-rise] { opacity: 1; transform: none; }
  .js .hero__name, .js .hero__meta, .js .hero__dek, .js .hero__cue { visibility: visible; }
}