/* ═══════════════════════════════════════════
   HUMAN LAYER · styles.css
   ═══════════════════════════════════════════ */

/* ── TOKENS ──────────────────────────────── */
:root {
  --white:   #fafaf8;
  --off:     #f2f0eb;
  --light:   #e5e2da;
  --mid:     #a8a39a;
  --dark:    #3d3b35;
  --ink:     #191812;
  --blue:    #4A6FFF;
  --blue-dk: #3558e8;
  --blue-lt: rgba(74,111,255,.07);
  --line:    rgba(25,24,18,.09);
  --line2:   rgba(25,24,18,.05);
  --sans:   'Syne', sans-serif;
  --mono:   'Syne Mono', monospace;
  --ease:    cubic-bezier(.22,.68,0,1.2);
}

/* ── RESET ───────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--sans);
  background: var(--white);
  color: var(--ink);
  line-height: 1.65;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
a { text-decoration: none; color: inherit; }
strong { color: var(--ink); }

/* ── CANVAS BG ───────────────────────────── */
#bg {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}

/* ── TYPOGRAPHY ──────────────────────────── */
.mono {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--mid);
  font-weight: 400;
}

h1 {
  font-family: var(--sans);
  font-size: clamp(54px, 9.5vw, 108px);
  font-weight: 700;
  line-height: .95;
  letter-spacing: -.04em;
  color: var(--ink);
}

h2 {
  font-family: var(--sans);
  font-size: clamp(34px, 5.5vw, 62px);
  font-weight: 600;
  line-height: 1.05;
  letter-spacing: -.025em;
  color: var(--ink);
}

h3 {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--blue);
  font-weight: 400;
  margin-bottom: 16px;
}

p {
  font-size: 17px;
  line-height: 1.78;
  color: var(--dark);
  max-width: 620px;
}

.em { color: var(--ink) !important; font-weight: 600; }
.blue { color: var(--blue); }

/* ── LAYOUT ──────────────────────────────── */
.wrap {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 52px;
  position: relative;
  z-index: 1;
}
@media (max-width: 768px) { .wrap { padding: 0 22px; } }

/* ── SCROLL REVEAL ───────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity .72s ease, transform .72s ease;
}
.reveal.in { opacity: 1; transform: none; }
.d1 { transition-delay: .08s; }
.d2 { transition-delay: .20s; }
.d3 { transition-delay: .35s; }
.d4 { transition-delay: .50s; }

/* ── NAV ─────────────────────────────────── */
#nav {
  position: fixed;
  inset: 0 0 auto;
  z-index: 300;
  border-bottom: 1px solid transparent;
  transition: background .35s, border-color .35s, backdrop-filter .35s;
}
#nav.scrolled {
  background: rgba(250,250,248,.93);
  backdrop-filter: blur(16px);
  border-bottom-color: var(--line2);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 52px;
}
@media (max-width: 768px) { .nav-inner { padding: 0 22px; } }

/* Logo */
.logo { display: flex; align-items: center; gap: 10px; }
.logo-dots { display: flex; flex-direction: column; gap: 5px; }
.ld {
  display: block;
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--blue);
  animation: ldp 2.8s ease-in-out infinite;
}
.ld:nth-child(2) { animation-delay: .55s; }
@keyframes ldp {
  0%,100% { opacity: .4; transform: scale(1); }
  50%     { opacity: 1;  transform: scale(1.4); }
}
.logo-name {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--ink);
}

/* Links */
.nav-links { display: flex; gap: 40px; list-style: none; }
.nav-links a {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--mid);
  position: relative;
  transition: color .2s;
}
.nav-links a::after {
  content: '';
  position: absolute;
  left: 0; bottom: -3px;
  width: 0; height: 1px;
  background: var(--blue);
  transition: width .25s;
}
.nav-links a:hover,
.nav-links a.active { color: var(--ink); }
.nav-links a:hover::after,
.nav-links a.active::after { width: 100%; }

/* Burger */
.burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 5px;
}
.burger span {
  display: block;
  width: 22px; height: 1.5px;
  background: var(--ink);
  transition: transform .25s, opacity .25s;
}
.burger.open span:first-child { transform: rotate(45deg) translate(4.5px, 4.5px); }
.burger.open span:last-child  { transform: rotate(-45deg) translate(4.5px, -4.5px); }
@media (max-width: 768px) { .nav-links { display: none; } .burger { display: flex; } }

/* Mobile menu */
.mob-menu {
  position: fixed;
  top: 70px; inset-inline: 0;
  background: var(--white);
  border-bottom: 1px solid var(--line2);
  display: flex;
  flex-direction: column;
  gap: 0;
  z-index: 290;
  transform: translateY(-110%);
  opacity: 0;
  pointer-events: none;
  transition: transform .35s ease, opacity .35s ease;
}
.mob-menu.open { transform: none; opacity: 1; pointer-events: auto; }
.mob-link {
  display: block;
  padding: 16px 22px;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--ink);
  border-bottom: 1px solid var(--line2);
}
.mob-link:last-child { border-bottom: none; }

/* ── CTA ─────────────────────────────────── */
.cta {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--blue);
  border-bottom: 1px solid rgba(74,111,255,.35);
  padding-bottom: 3px;
  transition: gap .3s var(--ease), border-color .2s;
}
.cta:hover { gap: 18px; border-color: var(--blue); }
.arr { font-family: var(--sans); font-size: 15px; font-weight: 400; }

/* ═══════════════════════════════════════════
   SECTION 1 · HOME
   ═══════════════════════════════════════════ */
.s-home {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 108px 0 80px;
}

.home-grid {
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: 80px;
  align-items: center;
}
@media (max-width: 900px) {
  .home-grid { grid-template-columns: 1fr; gap: 56px; }
  .arch-diagram { max-width: 320px; }
}

.kicker { margin-bottom: 26px; }
.lead {
  font-size: 18px;
  line-height: 1.75;
  max-width: 460px;
  margin: 28px 0 42px;
}

/* Arch diagram */
.arch-diagram {
  border: 1px solid var(--line);
  background: var(--off);
  overflow: hidden;
}
.ad-node {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 28px 32px;
  text-align: center;
  transition: background .25s;
}
.ad-node:hover { background: rgba(74,111,255,.04); }
.ad-hl {
  background: var(--blue-lt);
  border-block: 1px solid rgba(74,111,255,.12);
}
.ad-hl .ad-tag { color: rgba(74,111,255,.65); }
.ad-hl .ad-name { color: var(--blue); font-weight: 600; font-size: 17px; }
.ad-tag { /* .mono already applied in HTML */ }
.ad-name { font-size: 16px; font-weight: 500; color: var(--ink); }
.ad-bridge {
  display: flex;
  flex-direction: column;
  align-items: center;
}
.adb-dot {
  display: block;
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--blue);
  opacity: .3;
}
.adb-line {
  display: block;
  width: 1px; height: 20px;
  background: linear-gradient(180deg,
    rgba(74,111,255,.15),
    rgba(74,111,255,.5),
    rgba(74,111,255,.15));
}

/* Scroll cue */
.scroll-cue {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 64px;
}
.sc-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--mid);
  animation: scbounce 1.8s ease-in-out infinite;
}
@keyframes scbounce {
  0%,100% { transform: translateY(0); opacity: .5; }
  50%     { transform: translateY(5px); opacity: 1; }
}

/* ═══════════════════════════════════════════
   SECTION 2 · THE IDEA
   ═══════════════════════════════════════════ */
.s-idea {
  padding: 140px 0;
  border-top: 1px solid var(--line2);
}

/* Section header shared */
.sec-head { margin-bottom: 80px; }
.sec-n { margin-bottom: 18px; }
.sec-head h2 { margin-bottom: 12px; }
.sec-sub { font-size: 17px; color: var(--mid); font-style: italic; }

/* Idea rows */
.idea-row {
  display: grid;
  grid-template-columns: 210px 1fr;
  gap: 64px;
  padding: 60px 0;
  border-top: 1px solid var(--line2);
  align-items: start;
}
.idea-row:last-of-type { border-bottom: 1px solid var(--line2); }
@media (max-width: 768px) {
  .idea-row { grid-template-columns: 1fr; gap: 22px; padding: 40px 0; }
}

.ir-label { display: flex; flex-direction: column; gap: 13px; padding-top: 2px; }
.ir-n { color: var(--mid); }
.ir-body { display: flex; flex-direction: column; gap: 16px; }
.ir-body p { max-width: 580px; }

.idea-list {
  list-style: none;
  padding: 14px 0 14px 22px;
  border-left: 2px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.idea-list li {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--dark);
}

/* HL separator */
.hl-sep {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  padding: 12px 0;
  opacity: .28;
}
.sp-d {
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--blue);
  animation: seppulse 2.5s ease-in-out infinite;
}
.sp-d:last-child { animation-delay: .5s; }
@keyframes seppulse { 0%,100% { transform: scale(1); } 50% { transform: scale(1.7); } }
.sp-l { display: block; width: 40px; height: 1px; background: var(--line); }

/* ═══════════════════════════════════════════
   SECTION 3 · WHITE PAPER
   ═══════════════════════════════════════════ */
.s-wp {
  padding: 140px 0;
  background: var(--off);
  border-top: 1px solid var(--line2);
}

.wp-grid {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 100px;
  align-items: start;
}
@media (max-width: 900px) { .wp-grid { grid-template-columns: 1fr; gap: 60px; } }

.wp-left { display: flex; flex-direction: column; gap: 22px; }

/* TOC */
.toc {
  list-style: none;
  border-top: 1px solid var(--line2);
  margin-top: 10px;
}
.toc li {
  display: flex;
  align-items: baseline;
  gap: 18px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line2);
  font-size: 15.5px;
  color: var(--dark);
  cursor: default;
  transition: color .2s, padding-left .25s;
}
.toc li:hover { color: var(--ink); padding-left: 10px; }
.tn { min-width: 18px; flex-shrink: 0; }

/* WP Card */
.wp-card {
  position: sticky;
  top: 92px;
  background: var(--white);
  border: 1px solid var(--line);
  padding: 36px;
  display: flex;
  flex-direction: column;
  gap: 32px;
}
@media (max-width: 900px) { .wp-card { position: static; } }

/* Vertical diagram */
.vdiag { display: flex; flex-direction: column; align-items: center; }
.vd-node {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
  padding: 14px 20px;
  width: 100%;
  text-align: center;
  transition: background .2s;
}
.vd-node:hover { background: var(--blue-lt); }
.vd-hl {
  background: var(--blue-lt);
  border: 1px solid rgba(74,111,255,.13);
}
.vd-tag { /* .mono */ }
.vd-hl .vd-tag { color: rgba(74,111,255,.65); }
.vd-name { font-size: 15px; font-weight: 500; color: var(--ink); }
.vd-hl .vd-name { color: var(--blue); font-size: 16px; }
.vd-bridge { display: flex; flex-direction: column; align-items: center; }
.vdb-d { width: 5px; height: 5px; border-radius: 50%; background: var(--blue); opacity: .3; }
.vdb-l { width: 1px; height: 22px; background: linear-gradient(180deg,rgba(74,111,255,.15),rgba(74,111,255,.5),rgba(74,111,255,.15)); }

/* Download */
.wp-dl { display: flex; flex-direction: column; align-items: center; gap: 9px; }
.btn-dl {
  width: 100%;
  padding: 14px;
  background: var(--blue);
  color: #fff;
  border: none;
  cursor: pointer;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  transition: background .2s, transform .2s, box-shadow .2s;
}
.btn-dl:hover {
  background: var(--blue-dk);
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(74,111,255,.25);
}
.dl-sub { color: var(--mid); }

.wp-meta {
  border-top: 1px solid var(--line2);
  padding-top: 18px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

/* ═══════════════════════════════════════════
   SECTION 4 · APPLICATIONS
   ═══════════════════════════════════════════ */
.s-apps {
  padding: 140px 0;
  border-top: 1px solid var(--line2);
}

.apps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line2);
  border: 1px solid var(--line2);
  margin-top: 64px;
}
@media (max-width: 900px) { .apps-grid { grid-template-columns: repeat(2,1fr); } }
@media (max-width: 580px) { .apps-grid { grid-template-columns: 1fr; } }

.app-card {
  background: var(--white);
  padding: 44px 38px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  cursor: default;
  transition: background .25s;
}
.app-card:hover { background: var(--blue-lt); }
.app-card:hover .ac-pip { opacity: .5; transform: scale(1.5); }
.ac-n { display: block; }
.app-card h3 { margin-bottom: 0; }
.app-card p { font-size: 15px; max-width: 100%; }
.ac-pip {
  display: block;
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--blue);
  opacity: 0;
  margin-top: auto;
  transition: opacity .25s, transform .25s;
}

/* ═══════════════════════════════════════════
   SECTION 5 · ABOUT
   ═══════════════════════════════════════════ */
.s-about {
  padding: 140px 0;
  background: var(--off);
  border-top: 1px solid var(--line2);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 72px 96px;
}
@media (max-width: 768px) { .about-grid { grid-template-columns: 1fr; gap: 56px; } }

.about-block { display: flex; flex-direction: column; gap: 14px; }
.about-block p { font-size: 16px; max-width: 100%; }

.ext-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--blue);
  border-bottom: 1px solid rgba(74,111,255,.3);
  padding-bottom: 2px;
  width: fit-content;
  margin-top: 4px;
  transition: gap .25s var(--ease), border-color .2s;
}
.ext-link:hover { gap: 14px; border-color: var(--blue); }

/* Closing symbol */
.about-close {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
  margin-top: 80px;
  opacity: .25;
}
.acd {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--blue);
  animation: ldp 3s ease-in-out infinite;
}
.acd:last-child { animation-delay: .7s; }
.acl { width: 1px; height: 36px; background: linear-gradient(180deg,rgba(74,111,255,.2),rgba(74,111,255,.6),rgba(74,111,255,.2)); }

/* ═══════════════════════════════════════════
   FOOTER
   ═══════════════════════════════════════════ */
footer {
  background: var(--ink);
  color: var(--light);
  padding: 60px 0 0;
}

.ft-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
  padding-bottom: 48px;
}

.ft-brand { display: flex; flex-direction: column; gap: 6px; }
.ft-name {
  font-family: var(--mono);
  font-size: 14px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: #fff;
}
.ft-desc { color: var(--mid); }

.ft-dots { display: flex; gap: 9px; align-items: center; }
.ftd {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--blue);
  animation: ldp 3s ease-in-out infinite;
}
.ftd:nth-child(2) { animation-delay: .7s; }

.ft-nav { display: flex; gap: 28px; flex-wrap: wrap; }
.ft-nav a {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--mid);
  transition: color .2s;
}
.ft-nav a:hover { color: #fff; }

.ft-copy {
  border-top: 1px solid rgba(255,255,255,.06);
  padding: 20px 52px;
}
.ft-copy .mono { color: rgba(168,163,154,.5); }
@media (max-width: 768px) { .ft-copy { padding: 20px 22px; } }