/*
  Three2Four IT Consulting
  Editorial technical broadsheet — warm paper, ink, single vermillion accent.
*/

/* ---------------------------------------------------------------
   Tokens
   --------------------------------------------------------------- */
:root {
  --paper:      #f4f1e9;
  --paper-sunk: #ebe7db;
  --paper-rise: #fbf9f4;
  --ink:        #15130e;
  --ink-soft:   #4d4739;
  --ink-faint:  #8a8271;
  --rule:       #d8d2c1;
  --rule-soft:  #e4dfd1;
  --accent:     #c1440e;
  --accent-dim: #a03a0c;
  --pine:       #1f4a47;

  --font-display: "Instrument Serif", "Iowan Old Style", Georgia, serif;
  --font-body: "Karla", "Helvetica Neue", Helvetica, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;

  --gutter: clamp(1.25rem, 5vw, 4rem);
  --rhythm: clamp(4.5rem, 9vw, 8.5rem);
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper:      #14130f;
    --paper-sunk: #1c1a15;
    --paper-rise: #201e18;
    --ink:        #f2eee2;
    --ink-soft:   #b3ac9a;
    --ink-faint:  #7d7666;
    --rule:       #322e26;
    --rule-soft:  #272419;
    --accent:     #f2683a;
    --accent-dim: #d9552a;
    --pine:       #7fb3ad;
  }
}

/* ---------------------------------------------------------------
   Base
   --------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: clamp(1rem, 0.3vw + 0.95rem, 1.0625rem);
  line-height: 1.65;
  font-feature-settings: "kern" 1;
  -webkit-font-smoothing: antialiased;
  /* `clip`, not `hidden` — `hidden` makes body a scroll container and
     breaks `position: sticky` on the masthead. */
  overflow-x: clip;
}

/* Paper grain — sits above the background, below content. */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)'/%3E%3C/svg%3E");
}

@media (prefers-color-scheme: dark) {
  body::before { opacity: 0.06; }
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }

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

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.shell {
  width: min(1240px, 100% - (var(--gutter) * 2));
  margin-inline: auto;
  position: relative;
  z-index: 1;
}

.skip-link {
  position: absolute;
  left: -9999px;
}
.skip-link:focus {
  left: 1rem;
  top: 1rem;
  z-index: 100;
  padding: 0.75rem 1rem;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 0.8rem;
}

/* ---------------------------------------------------------------
   Typography primitives
   --------------------------------------------------------------- */
h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 400;
  letter-spacing: -0.015em;
  margin: 0;
}

.label {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.rule {
  border: 0;
  border-top: 1px solid var(--rule);
  margin: 0;
}

/* ---------------------------------------------------------------
   Header
   --------------------------------------------------------------- */
.masthead {
  position: sticky;
  top: 0;
  z-index: 40;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(12px) saturate(140%);
  border-bottom: 1px solid var(--rule);
}

.masthead-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding-block: 0.9rem;
  min-width: 0;
}

/* Contact lives in the CTA on desktop; it only joins the list on mobile,
   where the CTA is hidden. */
.nav-contact { display: none; }

.wordmark {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(1.05rem, 1.4vw, 1.35rem);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  line-height: 1;
  white-space: nowrap;
}
.wordmark em {
  font-style: normal;
  color: var(--accent);
}

.nav {
  display: flex;
  align-items: center;
  gap: clamp(1.25rem, 2.5vw, 2.25rem);
}

.nav-links {
  display: flex;
  gap: clamp(1.25rem, 2.5vw, 2.25rem);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-soft);
  padding-block: 0.35rem;
  position: relative;
  transition: color 0.25s var(--ease);
}
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.35s var(--ease);
}
.nav-links a:hover { color: var(--ink); }
.nav-links a:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--rule);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 0.5rem 0.75rem;
  cursor: pointer;
}

/* ---------------------------------------------------------------
   Buttons
   --------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 0.85rem 1.35rem;
  border: 1px solid var(--ink);
  background: var(--ink);
  color: var(--paper);
  cursor: pointer;
  transition: background 0.3s var(--ease), color 0.3s var(--ease),
              border-color 0.3s var(--ease), transform 0.3s var(--ease);
}
.btn .arrow {
  transition: transform 0.35s var(--ease);
}
.btn:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.btn:hover .arrow { transform: translateX(4px); }

.btn-quiet {
  background: transparent;
  color: var(--ink);
  border-color: var(--rule);
}
.btn-quiet:hover {
  background: transparent;
  color: var(--accent);
  border-color: var(--accent);
}

.btn-invert {
  background: var(--paper);
  border-color: var(--paper);
  color: var(--ink);
}
.btn-invert:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

/* ---------------------------------------------------------------
   Hero
   --------------------------------------------------------------- */
.hero {
  padding-block: clamp(3.5rem, 8vw, 7rem) clamp(3rem, 6vw, 5rem);
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.85fr);
  gap: clamp(2.5rem, 5vw, 5rem);
  align-items: end;
}

.hero-eyebrow {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  margin-bottom: clamp(1.5rem, 3vw, 2.25rem);
}
.hero-eyebrow::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--rule);
}

.hero h1 {
  font-size: clamp(3rem, 8.5vw, 6.75rem);
  line-height: 0.94;
  letter-spacing: -0.025em;
  margin-bottom: clamp(1.5rem, 3vw, 2rem);
}
.hero h1 .em {
  font-style: italic;
  color: var(--accent);
}

.hero-lead {
  font-size: clamp(1.0625rem, 0.6vw + 0.95rem, 1.25rem);
  line-height: 1.6;
  color: var(--ink-soft);
  max-width: 46ch;
  margin: 0 0 clamp(2rem, 4vw, 2.75rem);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
}

/* Spec panel — the "dossier" block */
.spec {
  border-top: 2px solid var(--ink);
  padding-top: 1.25rem;
}
.spec dl {
  margin: 0;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0;
}
.spec dt {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-faint);
  padding: 0.7rem 1.25rem 0.7rem 0;
  border-bottom: 1px solid var(--rule-soft);
  white-space: nowrap;
}
.spec dd {
  margin: 0;
  padding: 0.7rem 0;
  font-size: 0.9375rem;
  color: var(--ink);
  border-bottom: 1px solid var(--rule-soft);
  text-align: right;
}
.spec dd a { border-bottom: 1px solid var(--accent); }
.spec dd a:hover { color: var(--accent); }

/* Marquee of disciplines */
.ticker {
  border-block: 1px solid var(--rule);
  padding-block: 1rem;
  overflow: hidden;
  white-space: nowrap;
}
.ticker-track {
  display: inline-flex;
  gap: 3rem;
  animation: slide 38s linear infinite;
  will-change: transform;
}
.ticker-track > span {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-faint);
  display: inline-flex;
  align-items: center;
  gap: 3rem;
}
.ticker-track > span::after {
  content: "◆";
  font-size: 0.5rem;
  color: var(--accent);
}
@keyframes slide {
  from { transform: translateX(0); }
  to   { transform: translateX(-50%); }
}
.ticker:hover .ticker-track { animation-play-state: paused; }

/* ---------------------------------------------------------------
   Section scaffolding
   --------------------------------------------------------------- */
.section {
  padding-block: var(--rhythm);
}
.section-sunk {
  background: var(--paper-sunk);
  border-block: 1px solid var(--rule);
}

.section-head {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: clamp(1.5rem, 4vw, 4rem);
  align-items: baseline;
  margin-bottom: clamp(2.5rem, 5vw, 4rem);
}
.section-head h2 {
  font-size: clamp(2.1rem, 4.5vw, 3.5rem);
  line-height: 1.02;
}
.section-head p {
  margin: 0;
  color: var(--ink-soft);
  max-width: 52ch;
}
.section-mark {
  display: block;
  margin-bottom: 1rem;
}
.section-mark::before {
  content: "";
  display: inline-block;
  width: 1.75rem;
  height: 1px;
  background: var(--accent);
  vertical-align: middle;
  margin-right: 0.75rem;
}

/* ---------------------------------------------------------------
   Capabilities — numbered index
   --------------------------------------------------------------- */
.index {
  border-top: 1px solid var(--rule);
}

.entry {
  display: grid;
  grid-template-columns: 4.5rem minmax(0, 1fr) minmax(0, 1.15fr) 2rem;
  gap: clamp(1rem, 3vw, 2.5rem);
  align-items: start;
  padding-block: clamp(1.75rem, 3vw, 2.5rem);
  border-bottom: 1px solid var(--rule);
  position: relative;
  transition: background 0.4s var(--ease);
}
.entry::before {
  content: "";
  position: absolute;
  inset: 0 calc(var(--gutter) * -0.5);
  background: var(--paper-rise);
  opacity: 0;
  transition: opacity 0.4s var(--ease);
  z-index: -1;
}
.entry:hover::before { opacity: 1; }

.entry-num {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.1em;
  color: var(--ink-faint);
  padding-top: 0.5rem;
  transition: color 0.3s var(--ease);
}
.entry:hover .entry-num { color: var(--accent); }

.entry h3 {
  font-size: clamp(1.5rem, 2.2vw, 2rem);
  line-height: 1.1;
}

.entry-body p {
  margin: 0 0 1rem;
  color: var(--ink-soft);
}

.entry-tags {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 0.5rem;
}
.entry-tags li {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-faint);
  border: 1px solid var(--rule);
  padding: 0.25rem 0.6rem;
  border-radius: 999px;
}

.entry-arrow {
  font-family: var(--font-mono);
  color: var(--accent);
  opacity: 0;
  transform: translateX(-6px);
  transition: opacity 0.35s var(--ease), transform 0.35s var(--ease);
  padding-top: 0.4rem;
  text-align: right;
}
.entry:hover .entry-arrow {
  opacity: 1;
  transform: translateX(0);
}

/* ---------------------------------------------------------------
   Approach — timeline
   --------------------------------------------------------------- */
.track {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: clamp(1.25rem, 3vw, 2.5rem);
  position: relative;
  padding-top: 3rem;
}
.track::before {
  content: "";
  position: absolute;
  top: 0.5rem;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--rule);
}

.stage { position: relative; }
.stage::before {
  content: "";
  position: absolute;
  top: -2.5rem;
  left: 0;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--paper-sunk);
  border: 2px solid var(--accent);
}
.stage-num {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.18em;
  color: var(--ink-faint);
  display: block;
  margin-bottom: 0.75rem;
}
.stage h3 {
  font-size: clamp(1.375rem, 1.8vw, 1.75rem);
  margin-bottom: 0.5rem;
}
.stage p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.9375rem;
}

/* ---------------------------------------------------------------
   Selected work
   --------------------------------------------------------------- */
.dossiers {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border-top: 1px solid var(--rule);
}

.dossier {
  padding: clamp(2rem, 3.5vw, 2.75rem) clamp(1.5rem, 2.5vw, 2.25rem);
  border-right: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  display: flex;
  flex-direction: column;
  gap: 1rem;
  transition: background 0.4s var(--ease);
}
.dossier:last-child { border-right: 0; }
.dossier:hover { background: var(--paper-rise); }

.metric {
  font-family: var(--font-display);
  font-size: clamp(2rem, 3.4vw, 2.875rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--accent);
  margin: 0;
  text-wrap: balance;
}
.metric small {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-top: 0.85rem;
}

.dossier h3 {
  font-size: 1.3125rem;
  line-height: 1.2;
}
.dossier .desc {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.9375rem;
  flex: 1;
}

/* ---------------------------------------------------------------
   About
   --------------------------------------------------------------- */
.about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: clamp(2.5rem, 6vw, 6rem);
  align-items: start;
}
.statement {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 2.6vw, 2.25rem);
  line-height: 1.25;
  letter-spacing: -0.01em;
  margin: 0;
  text-wrap: balance;
}
.statement + p {
  margin: 1.75rem 0 0;
  color: var(--ink-soft);
  max-width: 54ch;
}

.principles {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--rule);
}
.principles li {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  padding-block: 1rem;
  border-bottom: 1px solid var(--rule);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.principles li::before {
  content: "→";
  color: var(--accent);
}

/* ---------------------------------------------------------------
   Contact — inverted close
   --------------------------------------------------------------- */
.close {
  background: var(--ink);
  color: var(--paper);
  padding-block: var(--rhythm);
}
.close .label { color: color-mix(in srgb, var(--paper) 55%, transparent); }
.close .section-mark::before { background: var(--accent); }

.close h2 {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  line-height: 1;
  margin-bottom: 1.5rem;
}
.close p {
  color: color-mix(in srgb, var(--paper) 72%, transparent);
  max-width: 48ch;
  margin: 0 0 clamp(2rem, 4vw, 3rem);
}

.mail {
  display: inline-block;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 4vw, 2.75rem);
  letter-spacing: -0.02em;
  padding-bottom: 0.35rem;
  background-image: linear-gradient(var(--accent), var(--accent));
  background-repeat: no-repeat;
  background-position: 0 100%;
  background-size: 100% 1px;
  transition: background-size 0.45s var(--ease), color 0.3s var(--ease);
}
.mail:hover {
  color: var(--accent);
  background-size: 100% 2px;
}

/* ---------------------------------------------------------------
   Footer
   --------------------------------------------------------------- */
.colophon {
  padding-block: 2rem;
  border-top: 1px solid var(--rule);
}
.colophon-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 2rem;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-faint);
}
.colophon a:hover { color: var(--accent); }

/* ---------------------------------------------------------------
   Reveal on scroll
   --------------------------------------------------------------- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.9s var(--ease), transform 0.9s var(--ease);
}
.reveal.is-visible {
  opacity: 1;
  transform: none;
}
.reveal[data-delay="1"] { transition-delay: 0.09s; }
.reveal[data-delay="2"] { transition-delay: 0.18s; }
.reveal[data-delay="3"] { transition-delay: 0.27s; }
.reveal[data-delay="4"] { transition-delay: 0.36s; }

/* ---------------------------------------------------------------
   Responsive
   --------------------------------------------------------------- */
@media (max-width: 1040px) {
  .hero-grid { grid-template-columns: 1fr; align-items: start; }
  .section-head { grid-template-columns: 1fr; }
  .about-grid { grid-template-columns: 1fr; }
  .dossiers { grid-template-columns: 1fr 1fr; }
  .dossier:nth-child(2) { border-right: 0; }
  .track { grid-template-columns: 1fr 1fr; row-gap: 2.5rem; }
}

@media (max-width: 760px) {
  .nav-links {
    position: absolute;
    top: 100%;
    right: 0;
    left: 0;
    flex-direction: column;
    gap: 0;
    background: var(--paper);
    border-bottom: 1px solid var(--rule);
    padding: 0.5rem var(--gutter) 1.25rem;
    display: none;
  }
  .nav-links.is-open { display: flex; }
  .nav-links li { border-top: 1px solid var(--rule-soft); }
  .nav-links a { display: block; padding-block: 0.85rem; }
  .nav-toggle { display: inline-flex; }
  .masthead-inner { position: relative; }
  .nav-contact { display: list-item; }

  /* The header CTA cannot shrink below its min-content width; left in place
     it widens <body> and clips every section. Contact moves into the menu. */
  .masthead .nav > .btn { display: none; }

  .entry {
    grid-template-columns: 2.5rem minmax(0, 1fr);
    gap: 0.75rem 1rem;
  }
  .entry-body { grid-column: 2; }
  .entry-arrow { display: none; }

  .dossiers { grid-template-columns: 1fr; }
  .dossier { border-right: 0; }

  .track { grid-template-columns: 1fr; }
  .track::before { display: none; }
  .stage {
    padding-left: 1.5rem;
    border-left: 1px solid var(--rule);
  }
  .stage::before { top: 0.4rem; left: -5px; }
  .track { padding-top: 0; }

  .spec dd { font-size: 0.875rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .reveal { opacity: 1; transform: none; }
  .ticker-track { animation: none; }
}