:root {
  --paper: #efe9dd;
  --paper-deep: #e6dfd0;
  --ink: #161310;
  --ink-soft: #6b6259;
  --line: #d6cfc1;
  --signal: #d24a1f;

  --display: "Instrument Serif", "Times New Roman", serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}

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

html, body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--mono);
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

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

a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
em { font-style: italic; }

/* paper grain + vignette */
body::before,
body::after {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
}
body::before {
  z-index: 1;
  opacity: 0.07;
  mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml;utf8,<svg viewBox='0 0 240 240' xmlns='http://www.w3.org/2000/svg'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/></filter><rect width='100%25' height='100%25' filter='url(%23n)'/></svg>");
}
body::after {
  z-index: 0;
  background: radial-gradient(120% 80% at 50% 0%, transparent 55%, rgba(40, 28, 16, 0.08) 100%);
}

main {
  position: relative;
  z-index: 2;
  padding: 32px 24px;
  max-width: 100vw;
}

@media (min-width: 640px)  { main { padding: 40px 40px; } }
@media (min-width: 900px)  { main { padding: 40px 56px; } }
@media (min-width: 1200px) { main { padding: 40px 80px; } }

.wrap { max-width: 1180px; }

/* masthead */
.masthead {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: 0.22em;
  color: var(--ink-soft);
}
.masthead .brand { color: var(--ink); font-weight: 500; }
.masthead .dim { display: none; }
@media (min-width: 640px) { .masthead .dim { display: inline; } }
.masthead-right { display: flex; align-items: center; gap: 20px; }
.masthead-right .vol { display: none; }
@media (min-width: 900px) { .masthead-right .vol { display: inline; } }
.masthead a { color: var(--ink); transition: color 200ms ease; }
.masthead a:hover { color: var(--signal); }

.rule { height: 1px; background: var(--line); width: 100%; margin: 20px 0 0; }

/* section header */
.sec-label {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: 0.26em;
  color: var(--ink-soft);
}
.sec-label .num { color: var(--signal); }
.sec-label .dash { height: 1px; width: 32px; background: var(--line); }

/* hero */
.hero { margin-top: 80px; }
@media (min-width: 900px) { .hero { margin-top: 112px; } }

.hero h1 {
  font-family: var(--display);
  font-weight: 400;
  font-size: clamp(2.75rem, 9vw, 8.75rem);
  line-height: 0.94;
  letter-spacing: -0.02em;
  margin-top: 24px;
}
.hero h1 em { color: var(--signal); }

.lede {
  margin-top: 40px;
  max-width: 640px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink);
}
@media (min-width: 900px) { .lede { margin-top: 56px; } }
.lede .slash { color: var(--ink-soft); user-select: none; }
.lede .dot {
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--signal);
  margin: 0 10px;
  vertical-align: middle;
  animation: pulse-dot 1.9s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

/* split */
.split {
  margin-top: 112px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
}
@media (min-width: 900px) {
  .split { margin-top: 176px; grid-template-columns: 1fr 1fr; gap: 80px; }
}

.split .col-label {
  display: flex;
  align-items: baseline;
  gap: 12px;
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: 0.26em;
  color: var(--ink-soft);
  margin-bottom: 24px;
}
.split .col-label .name { color: var(--ink); display: inline-flex; align-items: center; gap: 8px; }
.split .col-label .line { height: 1px; flex: 1; background: var(--line); }
.split .col-label .dot-sm {
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--signal);
  animation: pulse-dot 1.9s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

.list-human li {
  font-family: var(--display);
  font-size: 1.65rem;
  line-height: 1.25;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(214, 207, 193, 0.7);
  margin-bottom: 8px;
}
@media (min-width: 900px) { .list-human li { font-size: 2rem; } }

.list-agentic li {
  display: flex;
  gap: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(214, 207, 193, 0.7);
  margin-bottom: 10px;
  font-size: 15px;
  line-height: 1.6;
}
.list-agentic .idx {
  color: var(--signal);
  font-size: 11px;
  letter-spacing: 0.18em;
  padding-top: 6px;
  flex-shrink: 0;
}

/* truths */
.truths { margin-top: 112px; }
@media (min-width: 900px) { .truths { margin-top: 176px; } }

.truths-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 56px 80px;
  margin-top: 48px;
}
@media (min-width: 900px) { .truths-grid { grid-template-columns: 1fr 1fr; } }

.truth { display: flex; gap: 24px; }
.truth .idx {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--signal);
  padding-top: 8px;
  flex-shrink: 0;
}
.truth h3 {
  font-family: var(--display);
  font-weight: 400;
  font-size: 1.7rem;
  line-height: 1.15;
  letter-spacing: -0.01em;
  margin-bottom: 12px;
}
@media (min-width: 900px) { .truth h3 { font-size: 2rem; } }
.truth p {
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--ink-soft);
  max-width: 28rem;
}

/* CTA */
.cta { margin-top: 128px; }
@media (min-width: 900px) { .cta { margin-top: 192px; } }

.cta h2 {
  font-family: var(--display);
  font-weight: 400;
  font-size: clamp(2rem, 6vw, 5rem);
  line-height: 1.02;
  letter-spacing: -0.015em;
  max-width: 56rem;
  margin-top: 32px;
}
.cta h2 em { color: var(--signal); }

.cta-row {
  margin-top: 40px;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 16px 40px;
}
.cta-mail {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  font-size: 18px;
}
.cta-mail .label {
  border-bottom: 1px solid var(--ink);
  padding-bottom: 2px;
  transition: color 200ms ease, border-color 200ms ease;
}
.cta-mail .arrow {
  color: var(--signal);
  transition: transform 200ms ease;
  display: inline-block;
}
.cta-mail:hover .label { color: var(--signal); border-color: var(--signal); }
.cta-mail:hover .arrow { transform: translate(2px, -2px); }
.cta-aside {
  color: var(--ink-soft);
  font-size: 14px;
  display: inline-flex;
  align-items: baseline;
}
.cursor {
  display: inline-block;
  width: 0.55em;
  height: 1em;
  background: var(--ink-soft);
  margin-left: 6px;
  transform: translateY(2px);
  animation: blink 1.05s steps(1, end) infinite;
}

/* footer */
footer {
  margin: 160px 0 32px;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: 0.22em;
  color: var(--ink-soft);
}
@media (min-width: 900px) { footer { margin-top: 224px; } }
footer .right { display: inline-flex; align-items: center; gap: 8px; }
footer .dot-foot {
  display: inline-block;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--signal);
  animation: pulse-dot 1.9s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

/* animations */
@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%      { opacity: 0.35; transform: scale(0.78); }
}
@keyframes blink {
  0%, 55% { opacity: 1; }
  60%, 100% { opacity: 0; }
}
@keyframes fade-up {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: translateY(0); }
}
.fade-up { animation: fade-up 0.85s cubic-bezier(0.2, 0.7, 0.2, 1) both; }

@media (prefers-reduced-motion: reduce) {
  .fade-up, .cursor, .dot, .dot-sm, .dot-foot { animation: none; }
}