:root {
  --ink: #15221b;
  --muted: #5d6b63;
  --paper: #f4f0e7;
  --paper-deep: #e9e2d4;
  --green: #154734;
  --green-soft: #dbe6db;
  --sun: #eea83b;
  --line: rgba(21, 34, 27, 0.16);
  --max: 1240px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
.skip-link { position: fixed; left: 1rem; top: -5rem; z-index: 100; padding: .75rem 1rem; color: #fff; background: var(--green); }
.skip-link:focus { top: 1rem; }

.site-header {
  width: min(calc(100% - 48px), var(--max));
  height: 92px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
}
.brand { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; }
.brand-mark { width: 46px; height: 42px; object-fit: contain; }
.brand-copy { display: grid; line-height: 1.05; letter-spacing: .08em; }
.brand-copy strong { font-size: .94rem; }
.brand-copy small { margin-top: 5px; color: var(--muted); font-size: .68rem; letter-spacing: .18em; }
.site-nav { display: flex; gap: 34px; align-items: center; }
.site-nav a { position: relative; color: var(--muted); text-decoration: none; font-size: .9rem; }
.site-nav a::after { content: ""; position: absolute; left: 0; right: 100%; bottom: -6px; height: 1px; background: var(--green); transition: right .25s ease; }
.site-nav a:hover::after, .site-nav a:focus-visible::after { right: 0; }
.nav-toggle { display: none; border: 0; background: transparent; }

main { overflow: hidden; }
.hero {
  width: min(calc(100% - 48px), var(--max));
  min-height: 700px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.18fr .82fr;
  gap: clamp(36px, 5vw, 68px);
  align-items: center;
  padding: 80px 0 96px;
}
.eyebrow { margin: 0 0 22px; color: var(--green); font-size: .72rem; font-weight: 700; letter-spacing: .19em; }
.hero h1 { margin: 0; max-width: 760px; font-size: clamp(3rem, 4.2vw, 4.35rem); font-weight: 580; line-height: 1.08; letter-spacing: -.055em; }
.hero h1 span { display: block; color: var(--green); }
.hero-lead { max-width: 650px; margin: 30px 0 0; color: var(--muted); font-size: clamp(1rem, 1.4vw, 1.17rem); }
.hero-actions { display: flex; align-items: center; gap: 30px; margin-top: 42px; }
.button { display: inline-flex; min-height: 52px; align-items: center; justify-content: center; padding: 0 25px; border-radius: 2px; text-decoration: none; font-weight: 650; }
.button-primary { color: #fff; background: var(--green); box-shadow: 0 14px 32px rgba(21,71,52,.16); transition: transform .2s ease, box-shadow .2s ease; }
.button-primary:hover { transform: translateY(-2px); box-shadow: 0 18px 34px rgba(21,71,52,.24); }
.text-link { text-underline-offset: 5px; text-decoration-thickness: 1px; }

.hero-visual { position: relative; min-height: 570px; border: 1px solid var(--line); background: #eee8dc; isolation: isolate; }
.hero-visual svg { position: absolute; inset: 0; width: 100%; height: 100%; }
.visual-grid { position: absolute; inset: 0; opacity: .45; background-image: linear-gradient(var(--line) 1px, transparent 1px), linear-gradient(90deg, var(--line) 1px, transparent 1px); background-size: 48px 48px; mask-image: linear-gradient(to bottom, #000, transparent 88%); }
.sun { fill: var(--sun); }
.ridge-back { fill: var(--green-soft); }
.ridge-front { opacity: .96; }
.valley-line { fill: none; stroke: #fff; stroke-width: 2; stroke-dasharray: 8 10; opacity: .75; }
.nodes circle { fill: var(--paper); stroke: var(--green); stroke-width: 3; }
.visual-note { position: absolute; z-index: 2; padding: 9px 12px; border: 1px solid var(--line); background: rgba(244,240,231,.92); font-size: .76rem; letter-spacing: .06em; backdrop-filter: blur(8px); }
.visual-note span { color: var(--green); font-weight: 700; margin-right: 7px; }
.note-a { left: 4%; bottom: 20%; }
.note-b { left: 41%; top: 9%; }
.note-c { right: 4%; bottom: 15%; }

.section { width: min(calc(100% - 48px), var(--max)); margin: 0 auto; padding: 120px 0; }
.directions { border-top: 1px solid var(--line); }
.section-heading { display: grid; grid-template-columns: 1fr 1fr; column-gap: 60px; align-items: end; margin-bottom: 58px; }
.section-heading .eyebrow { grid-column: 1 / -1; }
.section-heading h2, .method h2, .manifesto h2 { margin: 0; font-size: clamp(2.35rem, 4.4vw, 4rem); font-weight: 560; line-height: 1.12; letter-spacing: -.045em; }
.section-heading > p:last-child { max-width: 480px; margin: 0; color: var(--muted); }
.direction-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.direction-card { min-height: 430px; padding: 34px; border: 1px solid var(--line); background: rgba(255,255,255,.18); display: flex; flex-direction: column; }
.direction-card.featured { color: #f8f4eb; background: var(--green); border-color: var(--green); }
.card-index { color: var(--muted); font-size: .72rem; font-weight: 700; letter-spacing: .15em; }
.featured .card-index { color: #a8c1af; }
.card-topline { display: flex; align-items: center; justify-content: space-between; }
.card-status { padding: 4px 7px; border: 1px solid currentColor; color: var(--muted); font-size: .6rem; font-weight: 700; letter-spacing: .13em; opacity: .78; }
.featured .card-status { color: #cfe0d4; }
.card-kicker { margin-top: 56px !important; color: var(--green) !important; font-size: .67rem; font-weight: 750; letter-spacing: .14em; }
.featured .card-kicker { color: #b9d1c1 !important; }
.direction-card h3 { margin: 7px 0 15px; font-size: 1.75rem; font-weight: 620; }
.direction-card p { margin: 0; color: var(--muted); }
.featured p { color: #d5e1d9; }
.direction-card ul { list-style: none; margin: auto 0 0; padding: 25px 0 0; border-top: 1px solid var(--line); }
.featured ul { border-color: rgba(255,255,255,.2); }
.direction-card li { padding: 4px 0; font-size: .88rem; }
.direction-card li::before { content: "—"; margin-right: 10px; opacity: .55; }

.method { display: grid; grid-template-columns: .92fr 1.08fr; gap: clamp(60px, 9vw, 130px); border-top: 1px solid var(--line); }
.method-intro > p:last-child { max-width: 470px; margin-top: 28px; color: var(--muted); }
.method-list { list-style: none; margin: 0; padding: 0; }
.method-list li { display: grid; grid-template-columns: 50px 1fr; gap: 24px; padding: 26px 0 30px; border-bottom: 1px solid var(--line); }
.method-list li:first-child { border-top: 1px solid var(--line); }
.method-list span { color: var(--green); font-size: .72rem; font-weight: 700; letter-spacing: .12em; }
.method-list h3 { margin: -5px 0 7px; font-size: 1.25rem; font-weight: 620; }
.method-list p { margin: 0; color: var(--muted); font-size: .92rem; }

.manifesto { position: relative; display: grid; grid-template-columns: .7fr 1.3fr; gap: 70px; min-height: 590px; align-items: center; border-top: 1px solid var(--line); }
.manifesto-mark { margin: 0; display: grid; place-items: center; user-select: none; }
.manifesto-mark img { width: min(100%, 330px); height: auto; opacity: .14; }
.manifesto-copy > p:not(.eyebrow):not(.status) { max-width: 680px; margin: 30px 0; color: var(--muted); font-size: 1.05rem; }
.status { display: inline-flex; align-items: center; gap: 10px; margin-top: 25px; font-size: .84rem; font-weight: 600; }
.status span { width: 9px; height: 9px; border-radius: 50%; background: var(--sun); box-shadow: 0 0 0 6px rgba(238,168,59,.14); }

.site-footer { width: min(calc(100% - 48px), var(--max)); margin: 0 auto; padding: 44px 0 52px; border-top: 1px solid var(--line); display: flex; justify-content: space-between; align-items: end; }
.site-footer strong { letter-spacing: .12em; }
.site-footer p { margin: 7px 0 0; color: var(--muted); font-size: .82rem; }
.footer-meta { display: flex; gap: 24px; color: var(--muted); font-size: .78rem; }
.footer-meta a { text-underline-offset: 4px; }

.reveal { opacity: 0; transform: translateY(18px); transition: opacity .65s ease, transform .65s ease; }
.reveal.is-visible { opacity: 1; transform: none; }

@media (max-width: 900px) {
  .site-header { height: 76px; }
  .nav-toggle { display: grid; gap: 6px; width: 44px; height: 44px; place-content: center; cursor: pointer; }
  .nav-toggle span:not(.sr-only) { width: 22px; height: 1px; background: var(--ink); transition: transform .2s ease; }
  .site-nav { position: absolute; z-index: 20; top: 75px; left: 24px; right: 24px; display: none; padding: 20px; flex-direction: column; align-items: flex-start; gap: 18px; background: var(--paper); border: 1px solid var(--line); box-shadow: 0 16px 40px rgba(21,34,27,.12); }
  .site-nav.is-open { display: flex; }
  .hero { grid-template-columns: 1fr; padding-top: 62px; }
  .hero-visual { min-height: 500px; }
  .section-heading { grid-template-columns: 1fr; gap: 24px; }
  .direction-grid { grid-template-columns: 1fr; }
  .direction-card { min-height: 350px; }
  .method { grid-template-columns: 1fr; }
  .manifesto { grid-template-columns: .45fr 1.55fr; gap: 25px; }
}

@media (max-width: 580px) {
  .site-header, .hero, .section, .site-footer { width: min(calc(100% - 32px), var(--max)); }
  .brand-mark { width: 37px; height: 37px; }
  .hero { min-height: auto; padding: 56px 0 72px; }
  .hero h1 { font-size: clamp(2.55rem, 12vw, 3.5rem); }
  .hero-actions { align-items: flex-start; flex-direction: column; gap: 20px; }
  .hero-visual { min-height: 410px; }
  .visual-note { font-size: .66rem; padding: 7px 9px; }
  .section { padding: 86px 0; }
  .direction-card { padding: 27px; }
  .manifesto { grid-template-columns: 1fr; }
  .manifesto-mark { position: absolute; right: -28px; top: 112px; width: 220px; }
  .manifesto-mark img { opacity: .08; }
  .manifesto-copy { position: relative; z-index: 1; }
  .site-footer { align-items: flex-start; flex-direction: column; gap: 28px; }
  .footer-meta { width: 100%; justify-content: space-between; }
}

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