/* ==========================================================
   13101401 Inc. — A Contemporary Corporation
   Editorial single-scroll layout · monochrome palette
   ========================================================== */

:root {
  /* 131 palette (from original site theme) */
  --paper: hsl(0, 0%, 98%);
  --ink: hsl(0, 0%, 0%);
  --dark: hsl(0, 0%, 11%);
  --hairline: hsl(0, 0%, 74%);
  --grey: hsl(0, 0%, 86.3%);
  --mid: hsl(0, 0%, 42%);

  /* type */
  --font-display: "Anton", "Helvetica Neue", Arial, sans-serif;
  --font-body: "Inter Tight", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "Space Mono", "Courier New", monospace;

  --rail: 76px;
  --content-max: 1180px;
  --pad-x: clamp(20px, 4vw, 56px);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

/* content kept in the DOM, deliberately hidden from the homepage nav/flow */
.is-hidden { display: none !important; }

html { scroll-behavior: smooth; }

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

::selection { background: var(--ink); color: var(--paper); }

a { color: inherit; text-decoration: none; }

img { display: block; max-width: 100%; height: auto; }

/* ---------- left rail ---------- */

.rail {
  position: fixed;
  top: 0; left: 0; bottom: 0;
  width: var(--rail);
  border-right: 1px solid var(--ink);
  background: var(--paper);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  padding: 18px 0;
  z-index: 100;
}

.rail .mark {
  font-size: 44px;
  line-height: 1;
  font-family: var(--font-body);
  font-weight: 300;
}

.rail .rail-title {
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .22em;
  text-transform: uppercase;
  white-space: nowrap;
}

.rail .rail-year {
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  white-space: nowrap;
}

/* ---------- main column ---------- */

main {
  margin-left: var(--rail);
}

.inner {
  max-width: var(--content-max);
  padding-left: var(--pad-x);
  padding-right: var(--pad-x);
  margin: 0 auto;
}

/* ---------- hero ---------- */

.hero {
  display: flex;
  flex-direction: column;
  border-bottom: 1px solid var(--ink);
}

.hero-top {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 18px var(--pad-x);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
  border-bottom: 1px solid var(--hairline);
}

.hero-top a:hover { background: var(--ink); color: var(--paper); }

.hero-headline {
  padding: clamp(28px, 6vh, 72px) var(--pad-x);
}

.hero-headline h1 {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(64px, 14.5vw, 220px);
  line-height: .92;
  letter-spacing: .005em;
  text-transform: uppercase;
}

.hero-headline .sub {
  margin-top: 20px;
  font-family: var(--font-mono);
  font-size: clamp(13px, 1.4vw, 16px);
  letter-spacing: .3em;
  text-transform: uppercase;
  color: var(--dark);
}

/* index / table of contents */
.toc {
  padding: 0 var(--pad-x) 26px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  border-top: 1px solid var(--ink);
  margin-top: clamp(28px, 6vh, 64px);
}

.toc a {
  display: flex;
  align-items: baseline;
  padding: 18px 4px;
  border-bottom: 1px solid var(--hairline);
  font-family: var(--font-display);
  font-size: clamp(18px, 2vw, 26px);
  text-transform: uppercase;
  letter-spacing: .02em;
  transition: background .15s, color .15s;
}

.toc a:hover { background: var(--ink); color: var(--paper); }

/* ---------- section band headers ---------- */

.band {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--paper);
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
}

.band h2 {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(22px, 3.2vw, 40px);
  line-height: 1;
  text-transform: uppercase;
  letter-spacing: .015em;
  padding: 14px var(--pad-x);
}

.band .band-meta {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--mid);
  padding: 14px var(--pad-x);
}

/* ---------- reading sections ---------- */

section.reading { border-bottom: 1px solid var(--ink); }

.reading-body {
  padding-top: clamp(36px, 7vh, 84px);
  padding-bottom: clamp(48px, 9vh, 110px);
}

.lede {
  font-size: clamp(22px, 2.6vw, 34px);
  line-height: 1.3;
  font-weight: 450;
  letter-spacing: -.01em;
  max-width: 21em;
}

.lede em { font-style: normal; border-bottom: 2px solid var(--ink); }

.body-copy {
  margin-top: 32px;
  max-width: 34em;
  color: var(--dark);
}

.body-copy p + p { margin-top: 1em; }

/* === divider === */
.rule-break {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .5em;
  text-align: center;
  color: var(--mid);
  padding: 34px 0;
  user-select: none;
}

/* ---------- hero cover figure ---------- */

.cover-figure {
  margin-top: clamp(36px, 7vh, 80px);
  border: 1px solid var(--ink);
}

.cover-figure img { width: 100%; filter: grayscale(1); }

.cover-figure figcaption {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  padding: 10px 14px;
  border-top: 1px solid var(--ink);
  display: flex;
  justify-content: space-between;
  color: var(--dark);
}

/* ---------- projects list ---------- */

.projects-list { border-top: 1px solid var(--hairline); }

.project-row { border-bottom: 1px solid var(--hairline); }

.project-row a {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 24px;
  padding: 26px 4px;
  transition: color .15s;
}

.pr-title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(26px, 4vw, 56px);
  text-transform: uppercase;
  letter-spacing: .015em;
  line-height: 1;
}

.pr-meta {
  display: flex;
  align-items: baseline;
  gap: 20px;
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--mid);
}

.project-row a:hover { color: var(--mid); }
.project-row a:hover .pr-title { color: var(--ink); }
.project-row a:hover .pr-arrow { color: var(--ink); }

/* floating cursor-follow preview */

.hover-preview {
  position: fixed;
  top: 0;
  left: 0;
  width: clamp(220px, 22vw, 320px);
  aspect-ratio: 4 / 3;
  border: 1px solid var(--ink);
  background: var(--grey);
  overflow: hidden;
  pointer-events: none;
  opacity: 0;
  z-index: 200;
  transition: opacity .2s ease;
  will-change: transform;
}

.hover-preview.is-visible { opacity: 1; }

.hover-preview img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(1);
}

@media (max-width: 760px) {
  .hover-preview { display: none; }
}

/* ---------- manifesto ---------- */

.principles { counter-reset: principle; border-top: 1px solid var(--hairline); }

.principle {
  counter-increment: principle;
  display: grid;
  grid-template-columns: 90px 1fr;
  align-items: baseline;
  gap: 10px;
  padding: 22px 0;
  border-bottom: 1px solid var(--hairline);
}

.principle::before {
  content: counter(principle, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--mid);
}

.principle p {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(24px, 3.6vw, 52px);
  line-height: 1.02;
  text-transform: uppercase;
  letter-spacing: .01em;
  transition: -webkit-text-stroke .15s, color .15s;
}

.principle:hover p {
  color: var(--paper);
  -webkit-text-stroke: 1.5px var(--ink);
}

/* ---------- research list ---------- */

.research-list { border-top: 1px solid var(--hairline); }

.research-item {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: clamp(16px, 3vw, 48px);
  padding: 30px 0;
  border-bottom: 1px solid var(--hairline);
}

.research-item .r-date {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--mid);
  padding-top: 8px;
}

.research-item h3 {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(26px, 3.4vw, 46px);
  line-height: 1;
  text-transform: uppercase;
  letter-spacing: .015em;
}

.research-item a:hover h3 {
  color: var(--paper);
  -webkit-text-stroke: 1.5px var(--ink);
}

.research-item .r-desc {
  margin-top: 12px;
  max-width: 36em;
  color: var(--dark);
}

.research-item .r-read {
  display: inline-block;
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
  border-bottom: 1px solid var(--ink);
  padding-bottom: 2px;
}

.research-item .r-read:hover { background: var(--ink); color: var(--paper); }

/* ---------- contact ---------- */

.newsletter .reading-body { text-align: left; }

.contact-cta {
  display: inline-block;
  margin-top: 36px;
  padding: 20px 28px;
  border: 1px solid var(--ink);
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(22px, 3vw, 34px);
  letter-spacing: .01em;
  transition: background .15s, color .15s;
}

.contact-cta:hover { background: var(--ink); color: var(--paper); }

/* ---------- footer ---------- */

footer {
  background: var(--ink);
  color: var(--paper);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 24px;
  align-items: end;
  padding: clamp(40px, 8vh, 90px) var(--pad-x) 28px;
}

.footer-wordmark {
  font-family: var(--font-display);
  font-size: clamp(40px, 8vw, 120px);
  line-height: .95;
  text-transform: uppercase;
}

.footer-links {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .12em;
  text-transform: uppercase;
  display: flex;
  flex-direction: column;
  gap: 10px;
  text-align: right;
}

.footer-links a:hover { background: var(--paper); color: var(--ink); }

.footer-bottom {
  display: flex;
  justify-content: space-between;
  padding: 16px var(--pad-x) 22px;
  border-top: 1px solid hsl(0, 0%, 30%);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--grey);
  flex-wrap: wrap;
  gap: 8px;
}

/* ---------- responsive ---------- */

@media (max-width: 760px) {
  :root { --rail: 0px; }

  .rail {
    position: sticky;
    top: 0;
    width: auto;
    height: 48px;
    flex-direction: row;
    padding: 0 16px;
    border-right: 0;
    border-bottom: 1px solid var(--ink);
  }

  .rail .mark { font-size: 26px; }

  .rail .rail-title,
  .rail .rail-year {
    writing-mode: horizontal-tb;
    font-size: 11px;
  }

  main { margin-left: 0; }

  .band { grid-template-columns: 1fr; }
  .band .band-meta { display: none; }

  .principle { grid-template-columns: 48px 1fr; }
  .research-item { grid-template-columns: 1fr; gap: 8px; }
  .footer-grid { grid-template-columns: 1fr; align-items: start; }
  .footer-links { text-align: left; }
}