:root {
  --ink: #08110f;
  --ink-soft: #17211e;
  --paper: #f1efe8;
  --paper-deep: #e4e0d5;
  --acid: #c8ff33;
  --mint: #89c9b5;
  --line: rgba(8, 17, 15, 0.16);
  --line-dark: rgba(241, 239, 232, 0.19);
  --muted: #66706b;
  --display: "Newsreader", Georgia, serif;
  --sans: "Archivo", "Helvetica Neue", sans-serif;
  --max: 1480px;
  --gutter: clamp(1.25rem, 4vw, 4.5rem);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; background: var(--ink); }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
button { color: inherit; font: inherit; }
::selection { background: var(--acid); color: var(--ink); }
[data-zh] { display: none !important; }
html[data-lang="zh"] [data-en] { display: none !important; }
html[data-lang="zh"] [data-zh] { display: revert !important; }

.skip-link {
  position: fixed;
  left: 1rem;
  top: -5rem;
  z-index: 999;
  padding: .75rem 1rem;
  background: var(--acid);
  color: var(--ink);
  transition: top .2s ease;
}
.skip-link:focus { top: 1rem; }

.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  height: 76px;
  padding: 0 var(--gutter);
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  color: var(--paper);
  border-bottom: 1px solid rgba(241, 239, 232, .12);
  background: rgba(8, 17, 15, .74);
  backdrop-filter: blur(18px);
  transition: height .25s ease, background .25s ease;
}
.site-header.scrolled { height: 64px; background: rgba(8, 17, 15, .94); }
.brand { display: inline-flex; align-items: center; gap: .72rem; width: max-content; }
.brand-mark {
  width: 35px;
  height: 35px;
  display: grid;
  place-items: center;
  border: 1px solid currentColor;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -.1em;
}
.brand-mark span { color: var(--acid); }
.brand-word { font-size: .8rem; font-weight: 750; letter-spacing: .18em; }
.nav { display: flex; align-items: center; gap: clamp(1.25rem, 2.6vw, 2.8rem); }
.nav a {
  position: relative;
  font-size: .72rem;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: rgba(241, 239, 232, .74);
  transition: color .2s ease;
}
.nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: -.45rem;
  height: 1px;
  background: var(--acid);
  transition: right .25s ease;
}
.nav a:hover, .nav a:focus-visible { color: var(--paper); }
.nav a:hover::after, .nav a:focus-visible::after { right: 0; }
.header-actions { justify-self: end; display: flex; align-items: center; gap: .75rem; }
.lang-toggle {
  min-width: 58px;
  min-height: 44px;
  border: 1px solid rgba(241, 239, 232, .34);
  background: transparent;
  color: var(--paper);
  cursor: pointer;
  font-size: .72rem;
  font-weight: 650;
  letter-spacing: .08em;
  transition: background .2s ease, color .2s ease, border-color .2s ease;
}
.lang-toggle:hover, .lang-toggle:focus-visible { background: var(--acid); color: var(--ink); border-color: var(--acid); }
.menu-toggle { display: none; width: 44px; height: 44px; border: 0; background: transparent; cursor: pointer; }
.menu-toggle span { display: block; width: 24px; height: 1px; margin: 6px auto; background: var(--paper); transition: transform .2s ease; }

.hero {
  min-height: 100svh;
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(9rem, 14vh, 11.5rem) var(--gutter) 2.3rem;
  color: var(--paper);
  background: var(--ink);
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(330px, .6fr);
  column-gap: clamp(3rem, 7vw, 8rem);
  row-gap: 3rem;
  align-items: center;
}
.hero-grid, .finale-grid {
  position: absolute;
  inset: 0;
  z-index: -2;
  opacity: .4;
  background-image: linear-gradient(rgba(241,239,232,.055) 1px, transparent 1px), linear-gradient(90deg, rgba(241,239,232,.055) 1px, transparent 1px);
  background-size: 76px 76px;
  mask-image: linear-gradient(to bottom, black 0%, transparent 88%);
}
.hero-glow {
  position: absolute;
  z-index: -1;
  width: min(55vw, 850px);
  aspect-ratio: 1;
  top: -30%;
  right: -10%;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(84, 163, 137, .25), transparent 67%);
  filter: blur(30px);
}
.eyebrow, .section-index {
  display: flex;
  align-items: center;
  gap: .7rem;
  color: var(--mint);
  font-size: .68rem;
  font-weight: 700;
  letter-spacing: .18em;
  text-transform: uppercase;
}
.status-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--acid); box-shadow: 0 0 0 6px rgba(200,255,51,.08), 0 0 18px rgba(200,255,51,.75); }
.hero h1 {
  margin: 1.4rem 0 1.7rem;
  font-family: var(--display);
  font-size: clamp(4rem, 8.3vw, 9.1rem);
  font-weight: 350;
  line-height: .83;
  letter-spacing: -.063em;
}
.hero h1 em, .display-title em, .finale h2 em { color: var(--acid); font-weight: 350; }
.hero-intro { max-width: 720px; margin: 0; font-size: clamp(1rem, 1.4vw, 1.25rem); line-height: 1.7; color: rgba(241,239,232,.69); }
.hero-actions, .finale-actions { display: flex; flex-wrap: wrap; gap: .85rem; margin-top: 2.2rem; }
.button {
  min-height: 52px;
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  padding: .85rem 1.15rem;
  border: 1px solid transparent;
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .04em;
  transition: transform .2s ease, background .2s ease, color .2s ease, border-color .2s ease;
}
.button:hover, .button:focus-visible { transform: translateY(-3px); }
.button-primary { min-width: 250px; color: var(--ink); background: var(--acid); border-color: var(--acid); }
.button-primary:hover, .button-primary:focus-visible { background: var(--paper); border-color: var(--paper); }
.button-quiet { color: var(--paper); border-color: rgba(241,239,232,.25); }
.button-quiet:hover, .button-quiet:focus-visible { border-color: var(--paper); background: rgba(241,239,232,.06); }

.hero-system {
  align-self: stretch;
  min-height: 500px;
  border: 1px solid var(--line-dark);
  background: rgba(241, 239, 232, .025);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 1.3rem;
  box-shadow: 0 30px 100px rgba(0,0,0,.25);
}
.system-head { display: flex; justify-content: space-between; color: rgba(241,239,232,.48); font-size: .62rem; font-weight: 650; letter-spacing: .14em; }
.live { color: var(--acid); }
.live i { display: inline-block; width: 5px; height: 5px; margin-right: .35rem; border-radius: 50%; background: var(--acid); animation: pulse 1.7s ease infinite; }
.system-orbit { position: relative; width: min(28vw, 360px); aspect-ratio: 1; margin: 1rem auto; display: grid; place-items: center; }
.orbit { position: absolute; border: 1px solid rgba(241,239,232,.19); border-radius: 50%; }
.orbit-a { inset: 3%; animation: spin 18s linear infinite; }
.orbit-a::before { content: ""; position: absolute; width: 9px; height: 9px; top: 13%; left: 14%; border-radius: 50%; background: var(--acid); box-shadow: 0 0 20px var(--acid); }
.orbit-b { inset: 20%; border-style: dashed; animation: spin 12s linear infinite reverse; }
.orbit-core { width: 37%; aspect-ratio: 1; display: grid; place-items: center; align-content: center; border: 1px solid var(--acid); border-radius: 50%; background: rgba(200,255,51,.04); box-shadow: inset 0 0 45px rgba(200,255,51,.06), 0 0 55px rgba(200,255,51,.05); }
.orbit-core span { font-family: var(--display); font-size: clamp(2rem, 4vw, 3.7rem); line-height: 1; }
.orbit-core small { margin-top: .4rem; font-size: .48rem; letter-spacing: .12em; color: var(--acid); }
.orbit-label { position: absolute; padding: .25rem .45rem; background: var(--ink); color: rgba(241,239,232,.56); font-size: .52rem; letter-spacing: .1em; }
.label-signal { top: 5%; right: 12%; }
.label-context { bottom: 12%; left: 4%; }
.label-action { bottom: 4%; right: 21%; }
.system-flow { display: flex; align-items: center; justify-content: space-between; color: rgba(241,239,232,.58); font-size: .5rem; letter-spacing: .05em; }
.system-flow i { height: 1px; flex: 1; margin: 0 .3rem; background: rgba(241,239,232,.19); }
.hero-system > p { margin: 0; padding-top: 1rem; border-top: 1px solid var(--line-dark); color: rgba(241,239,232,.67); font-family: var(--display); font-size: 1rem; font-style: italic; }
.hero-foot { grid-column: 1 / -1; display: flex; align-items: center; gap: 1rem; color: rgba(241,239,232,.39); font-size: .58rem; font-weight: 650; letter-spacing: .17em; }
.hero-foot i { width: 34px; height: 1px; background: rgba(241,239,232,.2); }

.section { max-width: var(--max); margin: 0 auto; padding: clamp(5.5rem, 10vw, 10rem) var(--gutter); }
.statement { border-bottom: 1px solid var(--line); }
.statement-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: clamp(3rem, 9vw, 10rem); margin-top: 4rem; align-items: start; }
.display-title { margin: 0; font-family: var(--display); font-size: clamp(3.2rem, 6.8vw, 7.4rem); font-weight: 350; line-height: .93; letter-spacing: -.05em; }
.display-title em { color: #467c69; }
.statement-copy { padding-top: .6rem; }
.statement-copy p { color: var(--muted); }
.statement-copy .lead { margin-top: 0; color: var(--ink); font-family: var(--display); font-size: clamp(1.45rem, 2.2vw, 2.25rem); line-height: 1.25; }
blockquote { margin: 2.8rem 0 0; padding: 1.6rem 0 1.6rem 1.6rem; border-left: 2px solid #467c69; color: var(--ink); font-family: var(--display); font-size: 1.2rem; font-style: italic; }

.section-head { display: grid; grid-template-columns: 1.25fr .75fr; gap: 4rem; align-items: end; margin-bottom: clamp(3.5rem, 7vw, 6rem); }
.section-head .section-index { margin-bottom: 1.7rem; }
.section-head > p { max-width: 520px; margin: 0 0 .5rem; justify-self: end; color: var(--muted); font-size: 1rem; }
.challenge { max-width: none; background: var(--paper-deep); }
.challenge .section-head, .challenge-list, .challenge-note { max-width: calc(var(--max) - 2 * var(--gutter)); margin-left: auto; margin-right: auto; }
.challenge-list { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--ink); border-bottom: 1px solid var(--ink); }
.challenge-card { position: relative; min-height: 540px; padding: 1.4rem clamp(1.25rem, 2.2vw, 2.3rem) 1.6rem; display: flex; flex-direction: column; border-right: 1px solid var(--ink); overflow: hidden; transition: color .35s ease, background .35s ease; }
.challenge-card:last-child { border-right: 0; }
.challenge-card::before { content: ""; position: absolute; inset: auto 0 0; height: 0; z-index: -1; background: var(--ink); transition: height .4s cubic-bezier(.2,.8,.2,1); }
.challenge-card:hover { color: var(--paper); }
.challenge-card:hover::before { height: 100%; }
.card-number { font-family: var(--display); font-size: 1.1rem; color: #356654; transition: color .35s ease; }
.card-theme { margin-top: 4.5rem; font-size: .65rem; font-weight: 700; letter-spacing: .16em; }
.challenge-card h3 { margin: 1.2rem 0; font-family: var(--display); font-size: clamp(2rem, 3.1vw, 3.45rem); font-weight: 400; line-height: .98; letter-spacing: -.035em; }
.challenge-card > p { color: #58625d; font-size: .9rem; transition: color .35s ease; }
.challenge-card:hover > p { color: rgba(241,239,232,.65); }
.card-outcome { margin-top: auto; padding-top: 1rem; border-top: 1px solid currentColor; display: grid; gap: .45rem; }
.card-outcome span { color: #356654; font-size: .56rem; font-weight: 750; letter-spacing: .16em; transition: color .35s ease; }
.card-outcome strong { font-family: var(--display); font-size: 1.15rem; font-weight: 500; }
.challenge-card:hover .card-number, .challenge-card:hover .card-outcome span { color: var(--acid); }
.challenge-note { padding-top: 1.45rem; display: flex; align-items: baseline; justify-content: space-between; gap: 2rem; color: #58625d; font-size: .72rem; }
.challenge-note p { max-width: 680px; margin: 0; }
.challenge-note a { flex: 0 0 auto; padding: .4rem 0; color: var(--ink); font-weight: 700; letter-spacing: .08em; border-bottom: 1px solid currentColor; }
.challenge-note a:hover, .challenge-note a:focus-visible { color: #356654; }

.decision-pipeline { padding: 1.3rem; border: 1px solid var(--line); display: flex; align-items: stretch; margin-bottom: 5rem; background: rgba(255,255,255,.22); }
.pipeline-step { flex: 1; min-height: 132px; padding: .9rem; display: grid; align-content: space-between; border: 1px solid transparent; }
.pipeline-step.active { color: var(--paper); background: var(--ink); }
.pipeline-step > span { color: #467c69; font-size: .55rem; font-weight: 700; letter-spacing: .1em; }
.pipeline-step strong { font-size: .72rem; letter-spacing: .1em; }
.pipeline-step small { color: var(--muted); font-size: .68rem; }
.pipeline-step.active small { color: rgba(241,239,232,.56); }
.pipeline-arrow { display: grid; place-items: center; color: #8c948f; font-size: 1.1rem; }
.capability-grid { display: grid; grid-template-columns: 1fr 1fr; border-top: 1px solid var(--line); }
.capability { min-height: 360px; padding: clamp(1.5rem, 3vw, 3rem); border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.capability:nth-child(2n) { border-right: 0; }
.capability-icon { width: 50px; height: 50px; display: grid; place-items: center; border: 1px solid var(--ink); font-family: var(--display); font-size: 1rem; }
.capability h3 { margin: 3.8rem 0 1rem; font-family: var(--display); font-size: clamp(1.8rem, 3.1vw, 3rem); font-weight: 400; letter-spacing: -.025em; }
.capability p { max-width: 560px; color: var(--muted); }
.capability-tags { display: flex; flex-wrap: wrap; gap: .45rem; margin-top: 2rem; }
.capability-tags span { padding: .3rem .55rem; border: 1px solid var(--line); color: #467c69; font-size: .55rem; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; }

.principles { max-width: none; color: var(--paper); background: var(--ink-soft); }
.principles > .section-index, .principles-grid { max-width: calc(var(--max) - 2 * var(--gutter)); margin-left: auto; margin-right: auto; }
.principles-grid { display: grid; grid-template-columns: .95fr 1.05fr; gap: clamp(4rem, 9vw, 10rem); margin-top: 4rem; }
.principles .display-title em { color: var(--acid); }
.kicker { color: var(--mint); font-size: .65rem; font-weight: 700; letter-spacing: .18em; }
.principle-list { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--line-dark); }
.principle-list li { display: grid; grid-template-columns: 48px 1fr; gap: 1rem; padding: 1.7rem 0; border-bottom: 1px solid var(--line-dark); }
.principle-list li > span { color: var(--acid); font-family: var(--display); }
.principle-list strong { display: block; margin-bottom: .4rem; font-family: var(--display); font-size: 1.45rem; font-weight: 450; }
.principle-list p { margin: 0; color: rgba(241,239,232,.58); font-size: .88rem; }

.finale { min-height: 82svh; position: relative; isolation: isolate; padding: clamp(6rem, 11vw, 11rem) var(--gutter); display: grid; grid-template-columns: 1.25fr .75fr; align-items: center; overflow: hidden; color: var(--paper); background: #0a1512; }
.finale-grid { mask-image: linear-gradient(to right, black, transparent); }
.finale-copy { position: relative; z-index: 1; }
.finale-label { margin: 2.5rem 0 1.4rem; color: var(--mint); font-size: .7rem; font-weight: 700; letter-spacing: .16em; }
.finale h2 { margin: 0; font-family: var(--display); font-size: clamp(3.4rem, 7vw, 7.8rem); font-weight: 350; line-height: .88; letter-spacing: -.055em; }
.button-quiet.light { color: var(--paper); }
.finale-mark { justify-self: center; font-family: var(--display); font-size: clamp(10rem, 25vw, 30rem); font-weight: 500; line-height: .8; letter-spacing: -.13em; color: transparent; -webkit-text-stroke: 1px rgba(241,239,232,.16); }
.finale-mark span { color: var(--acid); -webkit-text-stroke: 0; }

.footer { min-height: 120px; padding: 2rem var(--gutter); display: grid; grid-template-columns: 1fr 1fr 1fr; align-items: center; gap: 2rem; color: rgba(241,239,232,.48); background: var(--ink); border-top: 1px solid var(--line-dark); font-size: .68rem; }
.footer-brand { color: var(--paper); }
.footer p:nth-of-type(1) { text-align: center; }
.footer p:last-child { text-align: right; }

.reveal { opacity: 0; transform: translateY(24px); transition: opacity .75s ease, transform .75s cubic-bezier(.2,.8,.2,1); }
.reveal.visible { opacity: 1; transform: translateY(0); }
.reveal-delay-1 { transition-delay: .09s; }
.reveal-delay-2 { transition-delay: .18s; }
.reveal-delay-3 { transition-delay: .27s; }
@keyframes spin { to { transform: rotate(360deg); } }
@keyframes pulse { 50% { opacity: .35; box-shadow: 0 0 0 6px rgba(200,255,51,.18); } }

:focus-visible { outline: 2px solid var(--acid); outline-offset: 4px; }

@media (max-width: 1000px) {
  .site-header { grid-template-columns: 1fr auto; }
  .nav {
    position: fixed;
    inset: 64px 0 auto;
    padding: 2rem var(--gutter) 2.5rem;
    display: grid;
    gap: 1.4rem;
    background: rgba(8,17,15,.98);
    border-bottom: 1px solid var(--line-dark);
    transform: translateY(-120%);
    transition: transform .3s ease;
  }
  .nav.open { transform: translateY(0); }
  .nav a { font-size: .9rem; }
  .menu-toggle { display: block; }
  .menu-toggle.open span:first-child { transform: translateY(3.5px) rotate(45deg); }
  .menu-toggle.open span:last-child { transform: translateY(-3.5px) rotate(-45deg); }
  .hero { grid-template-columns: 1fr; min-height: auto; }
  .hero-system { min-height: 470px; }
  .system-orbit { width: min(68vw, 380px); }
  .statement-grid, .section-head, .principles-grid { grid-template-columns: 1fr; }
  .section-head > p { justify-self: start; }
  .challenge-list { grid-template-columns: 1fr; }
  .challenge-card { min-height: 450px; border-right: 0; border-bottom: 1px solid var(--ink); }
  .challenge-card:last-child { border-bottom: 0; }
  .challenge-note { align-items: flex-start; }
  .decision-pipeline { overflow-x: auto; }
  .pipeline-step { min-width: 150px; }
  .finale { grid-template-columns: 1fr; }
  .finale-mark { position: absolute; right: -5vw; bottom: 5rem; opacity: .45; }
}

@media (max-width: 640px) {
  .site-header { height: 64px; }
  .brand-word { display: none; }
  .hero { padding-top: 7.7rem; }
  .hero h1 { font-size: clamp(3.65rem, 17vw, 5.2rem); }
  .hero-actions, .finale-actions { display: grid; }
  .button, .button-primary { width: 100%; min-width: 0; }
  .hero-foot { align-items: flex-start; flex-direction: column; }
  .hero-foot i { display: none; }
  .hero-system { min-height: 420px; padding: 1rem; }
  .system-flow span { font-size: .44rem; }
  .statement-grid { margin-top: 2.5rem; }
  .challenge-note { flex-direction: column; gap: .8rem; }
  .capability-grid { grid-template-columns: 1fr; }
  .capability, .capability:nth-child(2n) { min-height: 320px; border-right: 0; }
  .principle-list li { grid-template-columns: 34px 1fr; }
  .finale { min-height: 92svh; }
  .finale h2 { font-size: clamp(3.25rem, 15vw, 5rem); }
  .footer { grid-template-columns: 1fr; text-align: left; }
  .footer p:nth-of-type(1), .footer p:last-child { text-align: left; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  .reveal { opacity: 1; transform: none; }
}