:root {
  --ink: #171915;
  --muted: #666b61;
  --paper: #f3f0e8;
  --paper-deep: #e7e1d4;
  --copper: #a7653f;
  --copper-dark: #75442b;
  --line: rgba(23, 25, 21, 0.18);
  --white: #fffdf8;
  font-family: Inter, "IBM Plex Sans", "Noto Sans SC", "Microsoft YaHei", system-ui, sans-serif;
  color: var(--ink);
  background: var(--paper);
  font-synthesis: none;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; min-width: 320px; background: var(--paper); }
a { color: inherit; }
p { line-height: 1.7; }

.skip-link {
  position: fixed;
  left: 1rem;
  top: -5rem;
  z-index: 10;
  background: var(--white);
  padding: 0.8rem 1rem;
}
.skip-link:focus { top: 1rem; }

.site-header {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1440px;
  margin: 0 auto;
  padding: 1.4rem clamp(1.25rem, 4vw, 4.5rem);
  border-bottom: 1px solid var(--line);
}
.brand { display: inline-flex; align-items: center; gap: 0.8rem; text-decoration: none; }
.brand-mark {
  display: grid;
  place-items: center;
  width: 2.6rem;
  height: 2.6rem;
  color: var(--paper);
  background: var(--ink);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  clip-path: polygon(18% 0, 100% 12%, 86% 88%, 8% 100%, 0 22%);
}
.brand-name { font-size: 0.92rem; font-weight: 800; letter-spacing: 0.2em; }
nav { display: flex; align-items: center; gap: clamp(1rem, 2.6vw, 2.8rem); }
nav a { color: #393d37; font-size: 0.82rem; font-weight: 650; text-decoration: none; }
nav a:hover, nav a:focus-visible { color: var(--copper-dark); }
.language-link { padding-left: 1.4rem; border-left: 1px solid var(--line); }

main, footer { max-width: 1440px; margin: 0 auto; }
.hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) minmax(18rem, 0.75fr);
  min-height: 700px;
  padding: clamp(4.5rem, 10vw, 9rem) clamp(1.25rem, 4vw, 4.5rem) 5rem;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.34;
  background-image: linear-gradient(var(--line) 1px, transparent 1px), linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 6.25rem 6.25rem;
  mask-image: linear-gradient(to bottom, black, transparent 82%);
}
.hero-copy, .signal-panel { position: relative; }
.eyebrow {
  margin: 0 0 1.4rem;
  color: var(--copper-dark);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}
.status-dot { display: inline-block; width: 0.5rem; height: 0.5rem; margin-right: 0.6rem; border-radius: 50%; background: var(--copper); box-shadow: 0 0 0 5px rgba(167, 101, 63, 0.12); }
h1, h2, h3, p { text-wrap: balance; }
h1 { max-width: 13ch; margin: 0; font-size: clamp(3.2rem, 7.3vw, 7.4rem); line-height: 0.92; letter-spacing: -0.065em; }
h1 span { color: var(--copper); }
.hero-intro { max-width: 48rem; margin: 2.2rem 0 0; color: #4c5149; font-size: clamp(1.05rem, 1.55vw, 1.3rem); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 0.8rem; margin-top: 2.2rem; }
.button { display: inline-flex; justify-content: center; padding: 0.95rem 1.25rem; border: 1px solid var(--ink); font-size: 0.82rem; font-weight: 750; text-decoration: none; }
.button-primary { color: var(--paper); background: var(--ink); }
.button-primary:hover { background: var(--copper-dark); border-color: var(--copper-dark); }
.button-secondary:hover { background: var(--white); }
.signal-panel { align-self: end; margin-left: clamp(0rem, 3vw, 4rem); padding: 1.6rem; color: var(--paper); background: var(--ink); box-shadow: 1.2rem 1.2rem 0 var(--copper); }
.panel-label { margin: 0 0 1.6rem; color: #b9bdb3; font-size: 0.7rem; font-weight: 750; letter-spacing: 0.15em; text-transform: uppercase; }
.signal-panel dl { margin: 0; }
.signal-panel dl div { display: grid; grid-template-columns: 3rem 1fr; align-items: baseline; padding: 0.9rem 0; border-top: 1px solid rgba(255,255,255,0.16); }
.signal-panel dt { color: #c97c4d; font-variant-numeric: tabular-nums; }
.signal-panel dd { margin: 0; font-weight: 700; }
.panel-note { margin: 1.5rem 0 0; color: #b9bdb3; font-size: 0.83rem; }

.principle-bar { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.principle-bar p { margin: 0; padding: 1.25rem; border-right: 1px solid var(--line); font-size: 0.72rem; font-weight: 750; letter-spacing: 0.08em; text-align: center; text-transform: uppercase; }
.principle-bar p:last-child { border-right: 0; }

.section { padding: clamp(5rem, 9vw, 9rem) clamp(1.25rem, 4vw, 4.5rem); }
.section-heading { display: grid; grid-template-columns: minmax(12rem, 0.55fr) minmax(18rem, 1.15fr); column-gap: 4rem; align-items: start; margin-bottom: 3.5rem; }
.section-heading .eyebrow { margin-top: 0.55rem; }
.section-heading h2 { margin: 0; font-size: clamp(2.25rem, 4vw, 4.4rem); line-height: 1; letter-spacing: -0.045em; }
.section-heading > p:last-child { grid-column: 2; max-width: 44rem; color: var(--muted); font-size: 1.05rem; }
.card-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; background: var(--line); border: 1px solid var(--line); }
.audience-card { padding: clamp(2rem, 4vw, 4rem); background: var(--white); }
.copper-card { color: var(--paper); background: var(--copper-dark); }
.card-index { margin: 0 0 3.5rem; font-size: 0.72rem; font-weight: 800; letter-spacing: 0.12em; text-transform: uppercase; }
.audience-card h3 { max-width: 14ch; margin: 0; font-size: clamp(1.8rem, 3vw, 3rem); line-height: 1.05; }
.audience-card > p:not(.card-index) { max-width: 38rem; margin-top: 1.4rem; color: var(--muted); }
.copper-card > p:not(.card-index) { color: #e7d8ce; }
.audience-card ul { margin: 2rem 0 0; padding: 0; list-style: none; }
.audience-card li { padding: 0.8rem 0; border-top: 1px solid var(--line); font-size: 0.88rem; }
.copper-card li { border-color: rgba(255,255,255,0.22); }

.verification-section { color: var(--paper); background: var(--ink); }
.verification-section .eyebrow { color: #c97c4d; }
.verification-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: rgba(255,255,255,0.17); }
.verification-grid > div { min-height: 19rem; padding: 2rem; background: var(--ink); }
.large-number { color: #c97c4d; font-size: 0.75rem; font-weight: 750; }
.verification-grid h3 { margin: 5rem 0 0.8rem; font-size: 1.35rem; }
.verification-grid p { color: #b9bdb3; font-size: 0.92rem; }
.verification-note { max-width: 68rem; margin: 2.5rem 0 0 auto; padding-left: 1.5rem; color: #b9bdb3; border-left: 2px solid var(--copper); font-size: 0.86rem; }

.process-list { margin: 0; padding: 0; border-top: 1px solid var(--line); list-style: none; }
.process-list li { display: grid; grid-template-columns: 5rem 0.7fr 1.3fr; gap: 1rem; align-items: baseline; padding: 1.5rem 0; border-bottom: 1px solid var(--line); }
.process-list li > span { color: var(--copper-dark); font-size: 0.74rem; font-weight: 800; }
.process-list strong { font-size: 1.2rem; }
.process-list p { margin: 0; color: var(--muted); }

.closing-panel { margin: 0 clamp(1.25rem, 4vw, 4.5rem) clamp(1.25rem, 4vw, 4.5rem); padding: clamp(2.5rem, 6vw, 6rem); border: 1px solid var(--line); background: var(--paper-deep); }
.closing-panel h2 { max-width: 15ch; margin: 0; font-size: clamp(2.5rem, 5vw, 5.2rem); line-height: 0.98; letter-spacing: -0.05em; }
.closing-panel > p:not(.eyebrow) { max-width: 45rem; margin-top: 1.5rem; color: var(--muted); }
.launch-tags { display: flex; flex-wrap: wrap; gap: 0.55rem; margin-top: 2rem; }
.launch-tags span { padding: 0.5rem 0.7rem; border: 1px solid var(--line); background: rgba(255,255,255,0.25); font-size: 0.74rem; font-weight: 700; }

footer { display: flex; justify-content: space-between; gap: 2rem; padding: 2.6rem clamp(1.25rem, 4vw, 4.5rem); border-top: 1px solid var(--line); }
footer strong { letter-spacing: 0.12em; }
footer p { max-width: 34rem; margin: 0.4rem 0 0; color: var(--muted); font-size: 0.76rem; }

@media (max-width: 850px) {
  .site-header { align-items: flex-start; }
  nav { gap: 1rem; }
  nav a:not(.language-link) { display: none; }
  .hero { grid-template-columns: 1fr; min-height: auto; }
  .signal-panel { margin: 4rem 1rem 0 0; }
  .principle-bar { grid-template-columns: 1fr 1fr; }
  .principle-bar p:nth-child(2) { border-right: 0; }
  .principle-bar p:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .section-heading { grid-template-columns: 1fr; gap: 1rem; }
  .section-heading > p:last-child { grid-column: 1; }
  .card-grid, .verification-grid { grid-template-columns: 1fr; }
  .process-list li { grid-template-columns: 3rem 1fr; }
  .process-list p { grid-column: 2; }
  footer { flex-direction: column; }
}

@media (max-width: 520px) {
  .hero { padding-top: 4rem; }
  h1 { font-size: clamp(3rem, 15vw, 4.6rem); }
  .hero-actions { flex-direction: column; }
  .button { width: 100%; }
  .principle-bar { grid-template-columns: 1fr; }
  .principle-bar p { border-right: 0; border-bottom: 1px solid var(--line); }
  .principle-bar p:last-child { border-bottom: 0; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}