:root {
  --green-900: #152a21;
  --green: #1f3a2e;
  --green-600: #2f5443;
  --moss: #6b8f5e;
  --bark: #8a6a4a;
  --paper: #f4f1ea;
  --paper-2: #ebe6db;
  --ink: #1c2420;
  --ink-soft: #55605a;
  --line: rgba(31, 58, 46, .16);

  --serif: "Noto Serif TC", serif;
  --sans: "Noto Sans TC", system-ui, sans-serif;
  --latin: "Cormorant Garamond", "Noto Serif TC", serif;

  --gutter: clamp(16px, 5vw, 64px);
  --header-h: 72px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: var(--header-h); }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 16px/1.9 var(--sans);
  letter-spacing: .04em;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3, h4, p, ol, ul, dl, dd { margin: 0; }
ol, ul { padding: 0; list-style: none; }
a { color: inherit; }
address { font-style: normal; }

.skip-link { position: absolute; left: 8px; top: -48px; z-index: 100; padding: 8px 16px; background: var(--green); color: var(--paper); }
.skip-link:focus { top: 8px; }
:focus-visible { outline: 2px solid var(--moss); outline-offset: 3px; }

.container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 var(--gutter); }
.sp-only { display: none; }

/* ---------- Header ---------- */
.header {
  position: fixed; inset: 0 0 auto; z-index: 50;
  height: var(--header-h);
  color: var(--paper);
  transition: background-color .3s, color .3s, box-shadow .3s;
}
.header.is-scrolled {
  background: rgba(244, 241, 234, .92);
  backdrop-filter: blur(10px);
  color: var(--green);
  box-shadow: 0 1px 0 var(--line);
}
.header__inner { height: 100%; display: flex; align-items: center; justify-content: space-between; padding: 0 var(--gutter); }
.logo { position: relative; z-index: 2; display: flex; align-items: center; gap: 12px; text-decoration: none; }
.logo__mark { width: 32px; height: 32px; fill: none; stroke: currentColor; stroke-width: 1.4; }
.logo__text { display: flex; flex-direction: column; line-height: 1.2; }
.logo__zh { font: 700 17px/1.3 var(--serif); letter-spacing: .12em; }
.logo__en { font: 500 13px/1.3 var(--latin); letter-spacing: .08em; opacity: .8; }

.nav ul { display: flex; gap: clamp(16px, 2vw, 32px); align-items: center; }
.nav a { font: 500 17px/1 var(--latin); letter-spacing: .06em; text-decoration: none; position: relative; padding: 6px 0; }
.nav a:not(.nav__cta)::after { content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 1px; background: currentColor; transform: scaleX(0); transform-origin: left; transition: transform .3s; }
.nav a:hover::after, .nav a[aria-current="true"]::after { transform: scaleX(1); }
.nav__cta { border: 1px solid currentColor; border-radius: 999px; padding: 8px 18px !important; transition: background-color .2s, color .2s; }
.nav__cta:hover { color: var(--paper); background: var(--green); border-color: var(--green); }
.header:not(.is-scrolled) .nav__cta:hover { color: var(--green); background: var(--paper); border-color: var(--paper); }

.menu-toggle { display: none; }

/* ---------- KV ---------- */
.kv {
  position: relative; overflow: hidden;
  min-height: 100vh; min-height: 100svh;
  display: flex; align-items: center;
  background: radial-gradient(ellipse at 70% 50%, var(--green-600) 0%, var(--green) 45%, var(--green-900) 100%);
  color: var(--paper);
}
.kv__rings { position: absolute; top: 50%; left: 68%; width: min(140vh, 150vw); height: min(140vh, 150vw); transform: translate(-50%, -50%); pointer-events: none; }
.kv__rings circle { fill: none; stroke: var(--paper); vector-effect: non-scaling-stroke; }
.kv__inner { position: relative; width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 var(--gutter); }
.kv__eyebrow { font: italic 500 clamp(15px, 1.6vw, 20px)/1.4 var(--latin); letter-spacing: .08em; opacity: .75; margin-bottom: 24px; }
.kv__title { font: 700 clamp(56px, 10vw, 128px)/1.15 var(--serif); letter-spacing: .14em; }
.kv__lead { margin-top: 32px; font-size: clamp(15px, 1.4vw, 18px); opacity: .85; }
.kv__scroll {
  position: absolute; left: var(--gutter); bottom: 32px; z-index: 1;
  font: 500 14px/1 var(--latin); letter-spacing: .2em; text-decoration: none; text-transform: uppercase;
  writing-mode: vertical-rl; padding-bottom: 64px;
}
.kv__scroll::after { content: ""; position: absolute; left: 50%; bottom: 0; width: 1px; height: 52px; background: currentColor; transform-origin: top; animation: scrollLine 2.4s ease-in-out infinite; }
@keyframes scrollLine { 0% { transform: scaleY(0); } 50% { transform: scaleY(1); transform-origin: top; } 51% { transform-origin: bottom; } 100% { transform: scaleY(0); transform-origin: bottom; } }

/* ---------- Section common ---------- */
.section { padding: clamp(88px, 12vw, 160px) 0; }
.section__head { display: flex; align-items: baseline; gap: 20px; margin-bottom: clamp(32px, 5vw, 56px); }
.section__title { font: 500 clamp(44px, 6vw, 80px)/1 var(--latin); letter-spacing: .02em; color: var(--green); }
.section__sub { font: 500 15px/1 var(--serif); letter-spacing: .2em; color: var(--ink-soft); }
.section__sub::before { content: ""; display: inline-block; width: 28px; height: 1px; background: currentColor; vertical-align: middle; margin-right: 12px; }
.section__desc { max-width: 720px; color: var(--ink-soft); margin-bottom: clamp(40px, 5vw, 64px); }
.subhead { font: 700 22px/1.5 var(--serif); letter-spacing: .12em; color: var(--green); margin: clamp(64px, 8vw, 96px) 0 32px; }

/* ---------- Milestones ---------- */
.timeline { display: grid; grid-template-columns: repeat(4, 1fr); position: relative; }
.timeline::before { content: ""; position: absolute; left: 0; right: 0; top: 7px; height: 1px; background: var(--green); opacity: .3; }
.timeline__item { position: relative; padding: 40px 24px 0 0; }
.timeline__item::before { content: ""; position: absolute; left: 0; top: 0; width: 15px; height: 15px; border-radius: 50%; background: var(--green); box-shadow: 0 0 0 5px var(--paper); }
.timeline__item--goal::before { background: var(--paper); border: 1px dashed var(--green); }
.timeline__date { display: block; font: 600 26px/1.2 var(--latin); color: var(--green); letter-spacing: .04em; }
.timeline__title { font: 700 18px/1.5 var(--serif); margin: 10px 0 8px; letter-spacing: .08em; }
.timeline__item p { font-size: 14px; color: var(--ink-soft); }

/* ---------- Vision ---------- */
.vision { background: var(--paper-2); }
.vision__intro { max-width: 760px; }
.vision__intro p + p { margin-top: 20px; color: var(--ink-soft); }
.vision__lead { font: 700 clamp(22px, 2.6vw, 32px)/1.7 var(--serif); letter-spacing: .1em; color: var(--green); }

.compare { display: grid; grid-template-columns: 1fr 1fr; margin-top: clamp(48px, 6vw, 72px); border: 1px solid var(--line); }
.compare__col { padding: clamp(28px, 4vw, 48px); }
.compare__col p:last-child { font-size: 15px; color: var(--ink-soft); }
.compare__col--ours { background: var(--green); color: var(--paper); }
.compare__col--ours p:last-child { color: rgba(244, 241, 234, .8); }
.compare__label { font: 500 14px/1.4 var(--sans); letter-spacing: .12em; opacity: .8; }
.compare__value { font: 700 clamp(32px, 4vw, 48px)/1.3 var(--serif); letter-spacing: .06em; margin: 12px 0 16px; }

.principles { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 1px; background: var(--line); border: 1px solid var(--line); }
.principle { background: var(--paper-2); padding: 32px 28px 36px; }
.principle__no { font: italic 500 32px/1 var(--latin); color: var(--moss); }
.principle__title { font: 700 18px/1.5 var(--serif); letter-spacing: .08em; color: var(--green); margin: 16px 0 12px; }
.principle p { font-size: 14px; color: var(--ink-soft); }

/* ---------- Ecosystem ---------- */
.ecosystem { background: var(--green); color: var(--paper); }
.ecosystem .section__title { color: var(--paper); }
.ecosystem .section__sub, .ecosystem .section__desc { color: rgba(244, 241, 234, .7); }
.flow { display: grid; grid-template-columns: repeat(5, 1fr); gap: 16px; counter-reset: flow; }
.flow__step { position: relative; padding: 28px 24px 32px; border: 1px solid rgba(244, 241, 234, .2); border-radius: 4px; transition: background-color .3s, border-color .3s; }
.flow__step:hover { background: rgba(244, 241, 234, .06); border-color: rgba(244, 241, 234, .45); }
.flow__step:not(:last-child)::after { content: "→"; position: absolute; right: -14px; top: 28px; font: 18px/1 var(--latin); color: var(--moss); }
.flow__no { font: italic 500 28px/1 var(--latin); color: #a9c79a; }
.flow__role { font-size: 13px; letter-spacing: .12em; opacity: .7; margin-top: 16px; }
.flow__name { font: 700 17px/1.5 var(--serif); letter-spacing: .06em; margin: 4px 0 12px; }
.flow__step > p:last-child { font-size: 14px; opacity: .8; }

/* ---------- Portfolio ---------- */
.barbell { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(20px, 3vw, 40px); position: relative; }
.barbell__label { font: 700 14px/1 var(--sans); letter-spacing: .16em; color: var(--moss); margin-bottom: 16px; display: flex; align-items: center; gap: 12px; }
.barbell__label::after { content: ""; flex: 1; height: 1px; background: var(--line); }
.card { background: #fff; padding: clamp(28px, 3.5vw, 44px); border-radius: 4px; box-shadow: 0 1px 2px rgba(31, 58, 46, .06); transition: transform .3s, box-shadow .3s; }
.card:hover { transform: translateY(-4px); box-shadow: 0 16px 40px -16px rgba(31, 58, 46, .25); }
.card > p:not([class]) { font-size: 15px; color: var(--ink-soft); }
.card__company { font-size: 13px; letter-spacing: .14em; color: var(--bark); }
.card__title { font: 700 clamp(24px, 2.6vw, 30px)/1.4 var(--serif); letter-spacing: .08em; color: var(--green); margin: 8px 0 4px; }
.card__title span { display: block; font: italic 500 18px/1.4 var(--latin); letter-spacing: .04em; color: var(--ink-soft); }
.card__team { font-size: 13px; color: var(--ink-soft); margin-bottom: 16px; padding-bottom: 16px; border-bottom: 1px solid var(--line); }
.tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 20px; }
.tags li { font: 500 13px/1 var(--sans); letter-spacing: .04em; padding: 7px 12px; border: 1px solid var(--line); border-radius: 999px; color: var(--green); }
.undisclosed { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(20px, 3vw, 40px); margin-top: clamp(20px, 3vw, 40px); }
.card--muted { background: transparent; border: 1px dashed rgba(31, 58, 46, .3); box-shadow: none; }
.card--muted:hover { transform: none; box-shadow: none; }
.card--muted .card__title { font-size: 20px; color: var(--ink-soft); margin-bottom: 12px; }

/* ---------- Team ---------- */
.team { background: var(--paper-2); }
.members { display: grid; grid-template-columns: repeat(4, 1fr); gap: clamp(16px, 2vw, 28px); }
.member { background: var(--paper); padding: 32px 28px; border-radius: 4px; }
.member__avatar {
  display: grid; place-items: center; width: 72px; height: 72px; border-radius: 50%;
  background: var(--green); color: var(--paper);
  font: 700 30px/1 var(--serif); margin-bottom: 24px;
  box-shadow: 0 0 0 6px var(--paper), 0 0 0 7px var(--line);
}
.member__role { font-size: 13px; letter-spacing: .16em; color: var(--moss); font-weight: 700; }
.member__name { font: 700 24px/1.5 var(--serif); letter-spacing: .14em; color: var(--green); }
.member__org { font-size: 14px; color: var(--bark); margin: 4px 0 12px; }
.member > p:last-child { font-size: 14px; color: var(--ink-soft); }

/* ---------- Partnership ---------- */
.partnership__grid { display: grid; grid-template-columns: 5fr 7fr; gap: clamp(40px, 6vw, 96px); align-items: start; }
.stats { display: grid; gap: 32px; }
.stat { border-left: 2px solid var(--green); padding-left: 24px; }
.stat__num { font: 600 clamp(56px, 7vw, 88px)/1 var(--latin); color: var(--green); }
.stat__num span { font-size: .5em; margin-left: 4px; }
.stat:nth-child(2) { border-color: var(--moss); }
.stat:nth-child(2) .stat__num { color: var(--moss); }
.stat__label { font-size: 15px; color: var(--ink-soft); margin-top: 8px; }
.stats__note { font-size: 12px; color: var(--ink-soft); opacity: .8; }
.partnership__body > p + p { margin-top: 20px; color: var(--ink-soft); }
.partnership__body .vision__lead { margin-bottom: 28px; }
.duo { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; margin-top: 40px; background: var(--line); border: 1px solid var(--line); }
.duo > div { background: var(--paper); padding: 20px 24px; }
.duo dt { font: 700 18px/1.5 var(--serif); letter-spacing: .1em; color: var(--green); }
.duo dd { font-size: 14px; color: var(--ink-soft); margin-top: 4px; }

/* ---------- Contact ---------- */
.contact { position: relative; overflow: hidden; background: var(--green-900); color: var(--paper); text-align: center; }
.contact::before { content: ""; position: absolute; inset: 50% auto auto 50%; width: 900px; height: 900px; transform: translate(-50%, -50%); border-radius: 50%;
  background: repeating-radial-gradient(circle, transparent 0 58px, rgba(244, 241, 234, .06) 58px 59px); pointer-events: none; }
.contact__inner { position: relative; }
.contact .section__title { color: var(--paper); }
.contact__lead { margin: 24px 0 40px; font: 500 clamp(17px, 1.8vw, 21px)/1.8 var(--serif); letter-spacing: .1em; opacity: .9; }
.contact__mail {
  display: inline-block; font: 500 clamp(24px, 4vw, 44px)/1.3 var(--latin); letter-spacing: .02em;
  text-decoration: none; padding-bottom: 6px; border-bottom: 1px solid rgba(244, 241, 234, .4);
  transition: border-color .3s, color .3s; word-break: break-all;
}
.contact__mail:hover { color: #a9c79a; border-color: #a9c79a; }
.contact__addr { margin-top: 32px; font-size: 14px; opacity: .7; }

/* ---------- Footer ---------- */
.footer { background: var(--green-900); color: rgba(244, 241, 234, .75); border-top: 1px solid rgba(244, 241, 234, .12); padding: 48px 0; font-size: 13px; }
.footer__inner { display: grid; grid-template-columns: auto 1fr; gap: 24px 48px; align-items: start; }
.footer__brand .logo__zh { color: var(--paper); font-size: 15px; }
.footer__info { display: flex; flex-wrap: wrap; gap: 8px 32px; justify-self: end; }
.footer__info div { display: flex; gap: 10px; }
.footer__info dt { opacity: .6; }
.footer__copy { grid-column: 1 / -1; opacity: .6; font-family: var(--latin); font-size: 14px; letter-spacing: .06em; }

/* ---------- Reveal ---------- */
.js .reveal { opacity: 0; transform: translateY(28px); transition: opacity .9s cubic-bezier(.2, .7, .2, 1), transform .9s cubic-bezier(.2, .7, .2, 1); }
.js .reveal.is-in { opacity: 1; transform: none; }

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .flow { grid-template-columns: repeat(2, 1fr); }
  .flow__step:not(:last-child)::after { display: none; }
  .members { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 900px) {
  :root { --header-h: 64px; }
  .menu-toggle {
    display: grid; place-content: center; gap: 7px; width: 44px; height: 44px;
    background: none; border: 0; color: inherit; cursor: pointer; position: relative; z-index: 2;
  }
  .menu-toggle span { display: block; width: 26px; height: 1.5px; background: currentColor; transition: transform .3s; }
  .menu-toggle[aria-expanded="true"] span:first-child { transform: translateY(4.25px) rotate(45deg); }
  .menu-toggle[aria-expanded="true"] span:last-child { transform: translateY(-4.25px) rotate(-45deg); }
  .nav {
    position: fixed; inset: 0; background: var(--green); color: var(--paper);
    display: grid; place-items: center; opacity: 0; visibility: hidden; transition: opacity .3s, visibility .3s;
  }
  .nav.is-open { opacity: 1; visibility: visible; }
  .nav ul { flex-direction: column; gap: 28px; }
  .nav a { font-size: 28px; }
  .header:has(.nav.is-open) { color: var(--paper); background: transparent; box-shadow: none; backdrop-filter: none; }
  .nav__cta:hover, .header:not(.is-scrolled) .nav__cta:hover { color: var(--green); background: var(--paper); border-color: var(--paper); }

  .timeline { grid-template-columns: 1fr; gap: 36px; padding-left: 36px; }
  .timeline::before { left: 7px; right: auto; top: 8px; bottom: 8px; width: 1px; height: auto; }
  .timeline__item { padding: 0; }
  .timeline__item::before { left: -36px; top: 6px; }

  .compare, .barbell, .undisclosed, .partnership__grid { grid-template-columns: 1fr; }
  .footer__inner { grid-template-columns: 1fr; }
  .footer__info { justify-self: start; }
}

@media (max-width: 600px) {
  .sp-only { display: inline; }
  .kv__rings { left: 80%; top: 32%; }
  .kv__title { letter-spacing: .08em; }
  .flow, .members, .duo { grid-template-columns: 1fr; }
  .section__head { flex-direction: column; gap: 12px; }
}

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