:root {
  color-scheme: dark;
  --field: #0b1510;
  --field-soft: #102219;
  --leaf: #173f2a;
  --leaf-light: #2f6745;
  --sun: #f3b91b;
  --cream: #f3edda;
  --cream-deep: #ded5bd;
  --ink: #111713;
  --muted: #a9b2aa;
  --line-dark: rgba(243, 237, 218, .19);
  --line-light: rgba(17, 23, 19, .18);
  --shell: min(1320px, calc(100vw - 96px));
  --header-height: 88px;
  --ease: cubic-bezier(.16, 1, .3, 1);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: var(--header-height); }
body {
  margin: 0;
  min-width: 320px;
  color: var(--cream);
  background: var(--field);
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.75;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
body.nav-open { overflow: hidden; }
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; }
button { color: inherit; }
h1, h2, h3, p { margin-top: 0; }
h1, h2, h3 { text-wrap: balance; }
:focus-visible { outline: 3px solid var(--sun); outline-offset: 4px; }

.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: 20px;
  top: 14px;
  z-index: 1000;
  padding: 10px 16px;
  background: var(--sun);
  color: var(--ink);
  transform: translateY(-160%);
}
.skip-link:focus { transform: translateY(0); }
.page-shell { width: var(--shell); margin-inline: auto; }
.section-dark { background: var(--field); }
.section-green { background: var(--leaf); }
.section-cream { background: var(--cream); color: var(--ink); }

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  min-height: var(--header-height);
  padding: 0 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid transparent;
  transition: background .35s ease, border-color .35s ease, min-height .35s ease;
}
.site-header.is-scrolled {
  min-height: 72px;
  background: rgba(11, 21, 16, .94);
  border-color: var(--line-dark);
  backdrop-filter: blur(12px);
}
.brand { display: inline-flex; align-items: center; gap: 12px; min-height: 48px; }
.brand-mark { width: 42px; height: 42px; fill: none; stroke: var(--sun); stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; flex: none; }
.brand-copy { display: grid; line-height: 1.2; }
.brand-copy strong { font-size: 18px; letter-spacing: .08em; }
.brand-copy small { margin-top: 5px; color: rgba(243, 237, 218, .64); font-size: 9px; letter-spacing: .16em; }
.site-nav { display: flex; align-items: center; gap: 34px; }
.site-nav a { position: relative; font-size: 14px; letter-spacing: .08em; }
.site-nav a:not(.nav-contact)::after {
  content: "";
  position: absolute;
  inset: auto 0 -8px;
  height: 1px;
  background: var(--sun);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform .35s var(--ease);
}
.site-nav a:hover::after, .site-nav a:focus-visible::after { transform: scaleX(1); transform-origin: left; }
.nav-contact { padding: 10px 18px; border: 1px solid rgba(243, 185, 27, .7); }
.nav-contact:hover { background: var(--sun); color: var(--ink); }
.menu-toggle { display: none; border: 0; background: transparent; width: 48px; height: 48px; padding: 12px; }
.menu-toggle span:not(.sr-only) { display: block; width: 24px; height: 1px; margin: 7px auto; background: currentColor; transition: transform .3s ease; }

.hero { position: relative; min-height: 100svh; display: grid; align-items: end; isolation: isolate; overflow: hidden; }
.hero-image, .hero-shade { position: absolute; inset: 0; width: 100%; height: 100%; }
.hero-image { z-index: -3; object-fit: cover; object-position: 56% center; }
.hero-shade {
  z-index: -2;
  background:
    linear-gradient(90deg, rgba(5, 11, 8, .94) 0%, rgba(5, 11, 8, .72) 43%, rgba(5, 11, 8, .08) 76%),
    linear-gradient(0deg, rgba(5, 11, 8, .78), transparent 46%);
}
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  opacity: .16;
  background-image: radial-gradient(rgba(255,255,255,.32) .6px, transparent .6px);
  background-size: 5px 5px;
  pointer-events: none;
}
.hero-grid { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 80px; align-items: end; padding: 180px 0 120px; }
.hero-content { max-width: 900px; }
.eyebrow, .overline { margin-bottom: 24px; color: var(--sun); font-size: 12px; font-weight: 700; letter-spacing: .2em; text-transform: uppercase; }
.hero h1 { margin-bottom: 34px; font-size: clamp(54px, 7vw, 116px); line-height: .98; letter-spacing: -.065em; font-weight: 760; }
.hero h1 em, .contact h2 em, .intro h2 em { color: var(--sun); font-family: Georgia, "Songti SC", serif; font-weight: 500; }
.hero-lead { max-width: 650px; color: rgba(243, 237, 218, .8); font-size: clamp(17px, 1.35vw, 21px); line-height: 1.85; }
.hero-actions { margin-top: 46px; display: flex; align-items: center; gap: 34px; }
.button { min-height: 50px; padding: 12px 24px; display: inline-flex; align-items: center; justify-content: center; border: 1px solid transparent; cursor: pointer; font-weight: 700; letter-spacing: .08em; transition: transform .25s ease, background .25s ease, color .25s ease; }
.button:hover { transform: translateY(-2px); }
.button-primary { background: var(--sun); color: var(--ink); }
.button-primary:hover { background: var(--cream); }
.button-dark { background: var(--field); color: var(--cream); }
.button-dark:hover { background: var(--sun); color: var(--ink); }
.text-link { padding-block: 12px; border-bottom: 1px solid rgba(243,237,218,.45); }
.text-link span { margin-left: 8px; color: var(--sun); }
.hero-index { display: grid; justify-items: center; gap: 10px; color: rgba(243,237,218,.55); font-size: 9px; letter-spacing: .18em; writing-mode: vertical-rl; }
.hero-index i { display: block; width: 1px; height: 38px; background: var(--sun); opacity: .58; }
.scroll-cue { position: absolute; left: 48px; bottom: 28px; display: flex; align-items: center; gap: 14px; color: rgba(243,237,218,.6); font-size: 11px; letter-spacing: .16em; }
.scroll-cue i { display: block; width: 64px; height: 1px; background: var(--sun); transform-origin: left; animation: cue 2.2s ease-in-out infinite; }
@keyframes cue { 0%,100% { transform: scaleX(.35); opacity: .45; } 50% { transform: scaleX(1); opacity: 1; } }

.section-kicker { display: flex; align-items: center; gap: 12px; color: rgba(243,237,218,.62); font-size: 12px; letter-spacing: .16em; }
.section-kicker span { color: var(--sun); font-weight: 800; }
.section-kicker p { margin: 0; }
.section-kicker-dark { color: rgba(17,23,19,.6); }
.intro { padding: 150px 0; border-bottom: 1px solid var(--line-dark); }
.intro-grid { display: grid; grid-template-columns: 180px minmax(0, 1fr) 280px; gap: 70px; align-items: start; }
.intro-copy h2 { margin-bottom: 42px; font-size: clamp(42px, 5vw, 74px); line-height: 1.12; letter-spacing: -.055em; }
.intro-copy > p { max-width: 720px; color: rgba(243,237,218,.68); font-size: 17px; }
.intro-species { border-top: 1px solid var(--line-dark); }
.intro-species p { margin: 0; padding: 20px 0; display: flex; gap: 24px; border-bottom: 1px solid var(--line-dark); font-size: 18px; }
.intro-species span { color: var(--sun); font-size: 11px; }

.varieties { padding: 150px 0 0; }
.section-heading { display: grid; grid-template-columns: 180px minmax(0, 1fr); gap: 70px; margin-bottom: 90px; }
.section-heading h2, .service h2, .development h2 { margin-bottom: 0; font-size: clamp(42px, 5.5vw, 82px); line-height: 1.05; letter-spacing: -.055em; }
.section-heading .overline, .service .overline, .development .overline { color: var(--leaf); }
.variety-chapter { display: grid; grid-template-columns: minmax(0, 1.42fr) minmax(360px, .58fr); min-height: 720px; border-top: 1px solid var(--line-light); }
.variety-chapter:last-child { border-bottom: 1px solid var(--line-light); }
.variety-reverse .variety-media { order: 2; }
.variety-reverse .variety-copy { order: 1; }
.variety-media { min-height: 620px; overflow: hidden; }
.variety-media img { width: 100%; height: 100%; object-fit: cover; transition: transform 1.1s var(--ease); }
.variety-chapter:hover .variety-media img { transform: scale(1.025); }
.variety-copy { padding: 92px clamp(48px, 7vw, 120px); display: flex; flex-direction: column; justify-content: center; }
.chapter-no { color: var(--leaf); font-size: 12px; font-weight: 800; letter-spacing: .18em; }
.variety-copy h3 { margin: 12px 0 30px; font-size: clamp(44px, 5vw, 72px); line-height: 1; letter-spacing: -.05em; }
.variety-copy > p { color: rgba(17,23,19,.7); }
.variety-copy dl { margin: 40px 0 0; border-top: 1px solid var(--line-light); }
.variety-copy dl div { padding: 20px 0; display: grid; grid-template-columns: 90px 1fr; gap: 22px; border-bottom: 1px solid var(--line-light); }
.variety-copy dt { color: var(--leaf); font-size: 12px; font-weight: 800; }
.variety-copy dd { margin: 0; font-size: 14px; }

.research { position: relative; min-height: 970px; padding: 150px 0; overflow: hidden; }
.research-media { position: absolute; inset: 0 0 0 48%; }
.research-media::after { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, var(--leaf), transparent 32%); }
.research-media img { width: 100%; height: 100%; object-fit: cover; }
.research-grid { position: relative; display: grid; grid-template-columns: 180px minmax(0, 520px); gap: 70px; }
.research-copy h2 { margin-bottom: 36px; font-size: clamp(45px, 5vw, 78px); line-height: 1.05; letter-spacing: -.055em; }
.research-copy > p:last-child { color: rgba(243,237,218,.72); font-size: 17px; }
.research-notes { position: relative; grid-column: 2; list-style: none; margin: 70px 0 0; padding: 0; border-top: 1px solid var(--line-dark); }
.research-notes li { padding: 24px 0; display: grid; grid-template-columns: 50px 120px 1fr; gap: 20px; border-bottom: 1px solid var(--line-dark); }
.research-notes span { color: var(--sun); font-size: 11px; }
.research-notes strong { font-size: 15px; }
.research-notes p { margin: 0; color: rgba(243,237,218,.64); font-size: 14px; }

.quality { padding: 150px 0; }
.section-heading-light .overline { color: var(--sun); }
.quality-image { width: calc(100% - 96px); height: min(58vw, 720px); margin: 0 auto; overflow: hidden; }
.quality-image img { width: 100%; height: 100%; object-fit: cover; }
.quality-steps { position: relative; display: grid; grid-template-columns: repeat(4, 1fr); margin-top: 72px; }
.quality-steps::before { content: ""; position: absolute; top: 10px; left: 0; right: 0; height: 1px; background: linear-gradient(90deg, var(--sun), rgba(243,185,27,.18)); }
.quality-steps div { padding: 40px 44px 0 0; }
.quality-steps span { position: relative; z-index: 1; display: block; width: 20px; height: 20px; margin-top: -40px; margin-bottom: 34px; border: 5px solid var(--field); border-radius: 50%; background: var(--sun); }
.quality-steps strong { display: block; margin-bottom: 10px; font-size: 21px; }
.quality-steps p { color: rgba(243,237,218,.6); font-size: 14px; }

.seasons { position: relative; min-height: 780px; display: flex; align-items: end; overflow: hidden; }
.seasons > img, .seasons-overlay { position: absolute; inset: 0; width: 100%; height: 100%; }
.seasons > img { object-fit: cover; }
.seasons-overlay { background: linear-gradient(90deg, rgba(8,16,11,.92), rgba(8,16,11,.38) 58%, transparent), linear-gradient(0deg, rgba(8,16,11,.58), transparent 55%); }
.seasons-copy { position: relative; padding-bottom: 110px; }
.seasons-copy h2 { max-width: 760px; margin-bottom: 30px; font-size: clamp(48px, 6vw, 90px); line-height: 1; letter-spacing: -.06em; }
.seasons-copy > p:last-child { max-width: 620px; color: rgba(243,237,218,.74); font-size: 17px; }

.service { padding: 150px 0; }
.service-grid { display: grid; grid-template-columns: 180px minmax(380px, .75fr) minmax(0, 1.25fr); gap: 70px; align-items: center; }
.service-copy p:not(.overline) { max-width: 580px; margin: 34px 0; color: rgba(17,23,19,.7); }
.service-media { min-height: 620px; }
.service-media img { width: 100%; height: 100%; object-fit: cover; }

.development { padding: 40px 0 150px; }
.development-grid { display: grid; grid-template-columns: 180px minmax(0, 1fr); gap: 70px; }
.development-copy { max-width: 850px; }
.timeline { grid-column: 2; list-style: none; margin: 80px 0 0; padding: 0; border-top: 1px solid var(--line-light); }
.timeline li { display: grid; grid-template-columns: 180px 1fr; gap: 40px; padding: 34px 0; border-bottom: 1px solid var(--line-light); }
.timeline time { color: var(--leaf); font-size: 34px; font-weight: 800; letter-spacing: -.04em; }
.timeline strong { display: block; margin-bottom: 7px; font-size: 18px; }
.timeline p { margin: 0; color: rgba(17,23,19,.65); }

.contact { padding: 150px 0 120px; }
.contact-grid { display: grid; grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr); gap: 70px 110px; }
.contact-lead h2 { font-size: clamp(44px, 5.5vw, 82px); line-height: 1.06; letter-spacing: -.055em; }
.contact-lead > p:last-child { max-width: 640px; color: rgba(243,237,218,.67); }
.contact-details { align-self: end; font-style: normal; border-top: 1px solid var(--line-dark); }
.contact-details p { margin: 0; padding: 18px 0; display: grid; grid-template-columns: 80px 1fr; gap: 24px; border-bottom: 1px solid var(--line-dark); }
.contact-details span { color: rgba(243,237,218,.76); font-size: 12px; }
.contact-details a, .contact-details b { font-weight: 500; }
.contact-details a:hover { color: var(--sun); }
.contact-form { grid-column: 2; margin-top: 20px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 30px; }
.contact-form label { display: grid; gap: 8px; margin-bottom: 24px; color: rgba(243,237,218,.8); font-size: 12px; letter-spacing: .08em; }
.contact-form input, .contact-form select, .contact-form textarea {
  width: 100%;
  min-height: 50px;
  padding: 10px 0;
  border: 0;
  border-bottom: 1px solid rgba(243,237,218,.42);
  border-radius: 0;
  background: transparent;
  color: var(--cream);
  outline: 0;
}
.contact-form select option { color: var(--ink); }
.contact-form textarea { resize: vertical; }
.contact-form input:focus, .contact-form select:focus, .contact-form textarea:focus { border-bottom-color: var(--sun); box-shadow: 0 1px 0 var(--sun); }
.form-submit { display: flex; align-items: center; gap: 24px; min-height: 64px; }
.form-status { margin: 0; color: var(--sun); font-size: 14px; }

.site-footer { padding: 54px 0; background: #070d09; border-top: 1px solid var(--line-dark); }
.footer-grid { display: grid; grid-template-columns: 1.2fr .8fr .8fr; gap: 60px; align-items: end; }
.footer-brand { display: flex; align-items: center; gap: 16px; }
.footer-brand div { display: grid; }
.footer-brand strong { font-size: 16px; }
.footer-brand span { margin-top: 4px; color: rgba(243,237,218,.72); font-size: 9px; letter-spacing: .13em; }
.site-footer nav { display: grid; grid-template-columns: 1fr 1fr; gap: 8px 28px; font-size: 13px; }
.site-footer nav a:hover { color: var(--sun); }
.footer-meta { text-align: right; color: rgba(243,237,218,.72); font-size: 11px; letter-spacing: .08em; }
.footer-meta p { margin: 4px 0; }

.js .reveal { opacity: 0; transform: translateY(34px); transition: opacity .9s var(--ease), transform .9s var(--ease); }
.js .reveal.is-visible { opacity: 1; transform: translateY(0); }

@media (max-width: 1100px) {
  :root { --shell: min(100% - 64px, 1000px); }
  .site-header { padding-inline: 32px; }
  .site-nav { gap: 22px; }
  .brand-copy small { display: none; }
  .intro-grid, .section-heading, .research-grid, .development-grid { grid-template-columns: 130px minmax(0, 1fr); gap: 44px; }
  .intro-species { grid-column: 2; }
  .variety-chapter { grid-template-columns: 1.15fr .85fr; }
  .variety-copy { padding-inline: 48px; }
  .service-grid { grid-template-columns: 130px minmax(0, .8fr) minmax(0, 1.2fr); gap: 40px; }
  .contact-grid { gap: 60px; }
}

@media (max-width: 900px) {
  :root { --header-height: 72px; }
  .site-header { min-height: 72px; }
  .menu-toggle { display: block; position: relative; z-index: 2; }
  .menu-toggle[aria-expanded="true"] span:nth-of-type(2) { transform: translateY(4px) rotate(45deg); }
  .menu-toggle[aria-expanded="true"] span:nth-of-type(3) { transform: translateY(-4px) rotate(-45deg); }
  .site-nav {
    position: fixed;
    inset: 0;
    padding: 130px 32px 48px;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--field);
    visibility: hidden;
    opacity: 0;
    transform: translateY(-18px);
    transition: opacity .3s ease, transform .3s ease, visibility .3s;
  }
  .site-nav.is-open { visibility: visible; opacity: 1; transform: translateY(0); }
  .site-nav a { padding: 18px 0; border-bottom: 1px solid var(--line-dark); font-size: 22px; }
  .nav-contact { margin-top: 28px; padding: 14px 18px !important; text-align: center; border: 1px solid var(--sun) !important; }
  .hero-grid { grid-template-columns: 1fr; padding-bottom: 100px; }
  .hero-content { max-width: 680px; }
  .hero-index { display: none; }
  .hero-image { object-position: 62% center; }
  .intro, .varieties, .quality, .service, .contact { padding-top: 110px; }
  .intro-grid, .section-heading, .research-grid, .development-grid, .service-grid { grid-template-columns: 1fr; gap: 34px; }
  .section-heading { margin-bottom: 64px; }
  .intro-species, .research-notes, .timeline { grid-column: 1; }
  .intro-species { max-width: 520px; }
  .variety-chapter { grid-template-columns: 1fr; min-height: 0; }
  .variety-reverse .variety-media, .variety-reverse .variety-copy { order: initial; }
  .variety-media { min-height: 0; aspect-ratio: 4 / 3; }
  .variety-copy { padding: 70px 32px 80px; }
  .research { min-height: auto; padding: 110px 0 0; }
  .research-media { position: relative; inset: auto; height: 560px; margin-top: 80px; }
  .research-media::after { background: linear-gradient(0deg, var(--leaf), transparent 30%); }
  .research-grid { display: contents; }
  .research-grid > * { width: var(--shell); margin-inline: auto; }
  .research-notes { margin-top: 50px; }
  .quality-steps { grid-template-columns: 1fr 1fr; gap: 0 28px; }
  .quality-steps::before { display: none; }
  .quality-steps div { padding: 26px 0; border-top: 1px solid var(--line-dark); }
  .quality-steps span { width: auto; height: auto; margin: 0 0 10px; border: 0; background: transparent; border-radius: 0; color: var(--sun); }
  .service-media { grid-row: auto; min-height: 0; aspect-ratio: 16 / 10; }
  .contact-grid { grid-template-columns: 1fr; }
  .contact-form { grid-column: 1; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-meta { grid-column: 1 / -1; text-align: left; }
}

@media (max-width: 600px) {
  :root { --shell: calc(100% - 40px); }
  body { font-size: 15px; }
  .site-header { padding-inline: 20px; }
  .brand-mark { width: 36px; height: 36px; }
  .brand-copy strong { font-size: 15px; }
  .hero { min-height: 820px; }
  .hero-shade { background: linear-gradient(0deg, rgba(5,11,8,.96) 0%, rgba(5,11,8,.72) 64%, rgba(5,11,8,.18)); }
  .hero-image { object-position: 61% center; }
  .hero-grid { padding: 150px 0 92px; }
  .hero h1 { font-size: clamp(48px, 14vw, 62px); }
  .hero-actions { align-items: flex-start; flex-direction: column; gap: 14px; }
  .scroll-cue { left: 20px; bottom: 20px; }
  .intro, .varieties, .quality, .service, .contact { padding-top: 88px; }
  .intro { padding-bottom: 88px; }
  .intro-copy h2, .section-heading h2, .service h2, .development h2 { font-size: 42px; }
  .section-kicker { margin-bottom: 8px; }
  .variety-copy { padding: 52px 20px 68px; }
  .variety-copy h3 { font-size: 46px; }
  .variety-copy dl div { grid-template-columns: 76px 1fr; gap: 14px; }
  .research { padding-top: 88px; }
  .research-copy h2, .seasons-copy h2, .contact-lead h2 { font-size: 44px; }
  .research-notes li { grid-template-columns: 34px 1fr; }
  .research-notes p { grid-column: 2; }
  .research-media { height: 430px; margin-top: 58px; }
  .quality-image { width: 100%; height: 420px; }
  .quality-steps { grid-template-columns: 1fr; margin-top: 52px; }
  .seasons { min-height: 680px; }
  .seasons > img { object-position: 62% center; }
  .seasons-copy { padding-bottom: 74px; }
  .service { padding-bottom: 88px; }
  .service-media { width: calc(100% + 40px); margin-left: -20px; }
  .development { padding: 20px 0 100px; }
  .timeline { margin-top: 52px; }
  .timeline li { grid-template-columns: 88px 1fr; gap: 20px; }
  .timeline time { font-size: 26px; }
  .contact { padding-bottom: 90px; }
  .form-row { grid-template-columns: 1fr; gap: 0; }
  .form-submit { align-items: flex-start; flex-direction: column; }
  .footer-grid { grid-template-columns: 1fr; gap: 34px; }
  .footer-meta { grid-column: auto; }
  .site-footer nav { max-width: 280px; }
}

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