:root {
  --cream: #f3efe5;
  --paper: #faf8f2;
  --gold: #d8a52f;
  --amber: #a64b1e;
  --ink: #171614;
  --muted: #6e685f;
  --steel: #c9c5bb;
  --line: rgba(23, 22, 20, 0.2);
  --pad: clamp(24px, 5vw, 78px);
  --serif: "Songti SC", "STSong", "Noto Serif CJK SC", Georgia, serif;
  --sans: "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", Arial, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--cream); font-family: var(--sans); overflow-x: hidden; }
body.menu-open { overflow: hidden; }
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button, input, textarea { font: inherit; }

.skip-link { position: fixed; z-index: 200; top: 12px; left: 12px; padding: 10px 14px; color: #fff; background: var(--ink); transform: translateY(-150%); }
.skip-link:focus { transform: translateY(0); }
.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; }

.site-header { position: fixed; z-index: 100; inset: 0 0 auto; display: flex; align-items: center; justify-content: space-between; min-height: 84px; padding: 14px var(--pad); color: var(--ink); background: rgba(243, 239, 229, 0.9); border-bottom: 1px solid var(--line); backdrop-filter: blur(16px); }
.brand { display: inline-flex; align-items: center; gap: 12px; min-width: 0; }
.brand-mark { width: 46px; height: 46px; flex: 0 0 auto; }
.mark-outline { fill: none; stroke: var(--amber); stroke-width: 5; }
.mark-flow { fill: var(--gold); stroke: var(--amber); stroke-width: 3; stroke-linejoin: round; }
.brand span { display: grid; gap: 3px; }
.brand strong { font-size: 16px; letter-spacing: 0.04em; }
.brand small { color: var(--muted); font-size: 11px; letter-spacing: 0.12em; }
.site-nav { display: flex; align-items: center; gap: clamp(24px, 3vw, 48px); font-size: 13px; letter-spacing: 0.08em; }
.site-nav a { position: relative; padding: 8px 0; }
.site-nav a::after { content: ""; position: absolute; right: 0; bottom: 2px; left: 0; height: 1px; background: var(--amber); transform: scaleX(0); transform-origin: right; transition: transform 220ms ease; }
.site-nav a:hover::after, .site-nav a:focus-visible::after { transform: scaleX(1); transform-origin: left; }
.menu-toggle { display: none; width: 44px; height: 44px; border: 0; background: transparent; cursor: pointer; }
.menu-toggle i { display: block; width: 24px; height: 1px; margin: 7px auto; background: currentColor; transition: transform 220ms ease; }

.section-pad { padding-inline: var(--pad); }
.section-label { font-size: 11px; letter-spacing: 0.18em; text-transform: uppercase; }
.section-label::before { content: ""; display: inline-block; width: 26px; height: 1px; margin-right: 10px; vertical-align: middle; background: var(--amber); }
.section-label-light { color: rgba(255,255,255,.68); }
.eyebrow { margin: 0 0 20px; font-size: 11px; letter-spacing: 0.18em; text-transform: uppercase; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: 0 24px; border: 1px solid currentColor; cursor: pointer; transition: color 180ms ease, background 180ms ease, transform 180ms ease; }
.button:hover { transform: translateY(-2px); }
.button-ink { color: #fff; background: var(--ink); border-color: var(--ink); }
.button-ink:hover { color: var(--ink); background: transparent; }
.button-amber { color: var(--ink); background: var(--gold); border-color: var(--gold); }
.button-amber:hover { color: #fff; background: var(--amber); border-color: var(--amber); }
.line-link { display: inline-flex; align-items: center; justify-content: space-between; gap: 32px; padding: 12px 0; border-bottom: 1px solid currentColor; font-size: 13px; letter-spacing: 0.06em; }

.hero { position: relative; min-height: 100svh; padding-top: 84px; background: var(--cream); overflow: hidden; }
.hero > img { position: absolute; inset: 84px 0 0; width: 100%; height: calc(100% - 84px); object-fit: cover; }
.hero::after { content: ""; position: absolute; inset: 84px 0 0; background: linear-gradient(90deg, rgba(243,239,229,.98) 0%, rgba(243,239,229,.92) 28%, rgba(243,239,229,.2) 58%, rgba(23,22,20,.05) 100%); }
.hero-copy { position: relative; z-index: 2; width: min(700px, 68vw); padding: clamp(150px, 22vh, 240px) var(--pad) 120px; animation: rise .7s ease-out both; }
.hero h1 { margin: 0; font: 400 clamp(48px, 7.1vw, 108px)/.98 var(--serif); letter-spacing: -.055em; }
.hero-lead { max-width: 550px; margin: 34px 0 0; color: #4f4a43; font-size: clamp(15px, 1.3vw, 19px); line-height: 1.9; }
.hero-actions { display: flex; align-items: center; gap: 30px; margin-top: 42px; }
.hero-caption { position: absolute; z-index: 2; right: var(--pad); bottom: 38px; display: grid; gap: 6px; min-width: 220px; padding-top: 12px; color: #fff; border-top: 1px solid rgba(255,255,255,.7); text-shadow: 0 1px 12px rgba(0,0,0,.3); }
.hero-caption span { font-size: 10px; letter-spacing: .16em; }
.hero-caption strong { font-size: 13px; letter-spacing: .08em; }

.origin { padding-block: 110px 126px; }
.origin-heading { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(300px, .7fr); gap: clamp(50px, 10vw, 160px); align-items: end; margin-top: 46px; }
.origin-heading h2, .atlas-head h2, .process-copy > h2, .observation h2, .development h2, .contact h2 { margin: 0; font: 400 clamp(42px, 6vw, 86px)/1.03 var(--serif); letter-spacing: -.05em; }
.origin-heading p, .atlas-head > p, .development-heading > p { margin: 0; color: var(--muted); font-size: 15px; line-height: 1.9; }
.origin-figure { display: grid; grid-template-columns: minmax(0, 1fr) 330px; gap: 28px; align-items: end; margin: 86px 0 0; }
.origin-figure img { width: 100%; aspect-ratio: 16/7.8; object-fit: cover; }
.origin-figure figcaption { display: grid; gap: 22px; padding: 20px 0; border-block: 1px solid var(--line); }
.origin-figure figcaption span { font-size: 11px; letter-spacing: .15em; }
.origin-figure figcaption p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.75; }

.product-atlas { background: var(--paper); border-top: 1px solid var(--line); }
.atlas-head { display: grid; grid-template-columns: .45fr 1fr .7fr; gap: 40px; align-items: end; padding-block: 104px 90px; }
.atlas-head h2 { font-size: clamp(42px, 5.5vw, 78px); }
.atlas-row { border-top: 1px solid var(--line); }
.atlas-starch { display: grid; grid-template-columns: 110px minmax(320px, 620px) 1fr; min-height: 330px; padding: 54px var(--pad); }
.atlas-index { color: var(--amber); font: 400 64px/1 var(--serif); }
.atlas-copy { align-self: center; max-width: 500px; }
.atlas-copy > span { font-size: 10px; letter-spacing: .18em; text-transform: uppercase; }
.atlas-copy h3 { margin: 20px 0 18px; font: 400 clamp(42px, 5vw, 72px)/1 var(--serif); letter-spacing: -.04em; }
.atlas-copy p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.85; }
.atlas-rule { align-self: center; height: 1px; background: linear-gradient(90deg, var(--gold), transparent); }
.atlas-image-row { position: relative; display: grid; grid-template-columns: 1.28fr .72fr; min-height: 650px; overflow: hidden; }
.atlas-image-row > img { width: 100%; height: 100%; min-height: 650px; object-fit: cover; }
.atlas-image-row .atlas-copy { padding: clamp(48px, 7vw, 110px) var(--pad); }
.atlas-copy-over { color: var(--paper); background: var(--ink); }
.atlas-copy-over p { color: rgba(255,255,255,.66); }
.atlas-reverse { grid-template-columns: .72fr 1.28fr; }
.atlas-lactic { border-bottom: 1px solid var(--line); }

.process { display: grid; grid-template-columns: 1.13fr .87fr; min-height: 880px; color: #fff; background: var(--ink); }
.process-visual { margin: 0; min-height: 780px; }
.process-visual img { width: 100%; height: 100%; object-fit: cover; }
.process-copy { display: flex; flex-direction: column; justify-content: center; padding-block: 110px; }
.process-copy > p { max-width: 560px; margin: 34px 0 52px; color: rgba(255,255,255,.65); font-size: 14px; line-height: 1.9; }
.process-steps { margin: 0; padding: 0; list-style: none; border-top: 1px solid rgba(255,255,255,.18); }
.process-steps li { display: grid; grid-template-columns: 54px 1fr; gap: 20px; padding: 25px 0; border-bottom: 1px solid rgba(255,255,255,.18); }
.process-steps li > span { color: var(--gold); font-size: 11px; }
.process-steps h3 { margin: 0 0 8px; font-size: 14px; letter-spacing: .05em; }
.process-steps p { margin: 0; color: rgba(255,255,255,.58); font-size: 12px; line-height: 1.7; }

.observation { padding-block: 120px 132px; }
.observation-grid { display: grid; grid-template-columns: .78fr 1.22fr; gap: clamp(60px, 10vw, 150px); align-items: center; margin-top: 62px; }
.observation-copy p { max-width: 510px; margin: 32px 0; color: var(--muted); font-size: 15px; line-height: 1.9; }
.observation figure { margin: 0; }
.observation img { width: 100%; aspect-ratio: 4/3; object-fit: cover; }

.development { padding-block: 110px 128px; color: var(--paper); background: #2a211c; }
.development-heading { display: grid; grid-template-columns: 1fr .55fr; gap: 60px; align-items: end; margin-top: 42px; }
.development-heading > p { color: rgba(255,255,255,.6); }
.timeline { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; margin: 90px 0 0; padding: 0; list-style: none; border-top: 1px solid rgba(255,255,255,.28); }
.timeline li { position: relative; padding: 38px clamp(24px, 3vw, 48px) 0 0; }
.timeline li::before { content: ""; position: absolute; top: -6px; left: 0; width: 11px; height: 11px; background: var(--gold); border-radius: 50%; }
.timeline time { color: var(--gold); font: 400 42px/1 var(--serif); }
.timeline h3 { margin: 26px 0 14px; font-size: 15px; }
.timeline p { margin: 0; color: rgba(255,255,255,.58); font-size: 13px; line-height: 1.8; }

.contact { position: relative; min-height: 920px; color: #fff; overflow: hidden; }
.contact > img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.contact-shade { position: absolute; inset: 0; background: linear-gradient(90deg, rgba(23,22,20,.9), rgba(23,22,20,.64) 50%, rgba(23,22,20,.3)); }
.contact-inner { position: relative; display: grid; grid-template-columns: .82fr 1.18fr; gap: clamp(60px, 11vw, 170px); align-items: center; min-height: 920px; padding-block: 120px; }
.contact-copy p:last-child { max-width: 520px; margin: 30px 0 0; color: rgba(255,255,255,.68); font-size: 14px; line-height: 1.9; }
.inquiry-form { display: grid; grid-template-columns: 1fr 1fr; gap: 28px 24px; padding: clamp(32px, 4vw, 58px); color: var(--ink); background: rgba(250,248,242,.95); backdrop-filter: blur(12px); }
.inquiry-form label { display: grid; gap: 9px; }
.inquiry-form label span { font-size: 11px; letter-spacing: .12em; }
.inquiry-form input, .inquiry-form textarea { width: 100%; padding: 12px 0; color: var(--ink); background: transparent; border: 0; border-bottom: 1px solid rgba(23,22,20,.35); border-radius: 0; outline: none; }
.inquiry-form textarea { resize: vertical; }
.inquiry-form input:focus, .inquiry-form textarea:focus { border-color: var(--amber); box-shadow: 0 1px 0 var(--amber); }
.field-wide { grid-column: 1 / -1; }
.form-actions { display: flex; align-items: center; gap: 24px; }
.form-status { margin: 0; color: var(--amber); font-size: 12px; line-height: 1.6; }

.site-footer { display: grid; grid-template-columns: 1.25fr .9fr .55fr; gap: 40px; align-items: center; padding: 50px var(--pad); color: var(--paper); background: var(--ink); border-top: 1px solid rgba(255,255,255,.14); }
.brand-footer .mark-outline { stroke: var(--gold); }
.brand-footer .mark-flow { fill: var(--amber); stroke: var(--gold); }
.brand-footer small { color: rgba(255,255,255,.52); }
.site-footer nav { display: flex; flex-wrap: wrap; gap: 14px 26px; font-size: 12px; }
.creative-note, .copyright { margin: 0; color: rgba(255,255,255,.5); font-size: 10px; line-height: 1.7; text-align: right; }
.copyright { grid-column: 3; }

@keyframes rise { from { opacity: 0; transform: translateY(24px); } to { opacity: 1; transform: translateY(0); } }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; } }

@media (max-width: 980px) {
  .site-header { min-height: 76px; }
  .hero { padding-top: 76px; }
  .hero > img, .hero::after { inset-block-start: 76px; height: calc(100% - 76px); }
  .origin-heading, .development-heading { grid-template-columns: 1fr; }
  .origin-figure { grid-template-columns: 1fr; }
  .origin-figure figcaption { grid-template-columns: 120px 1fr; }
  .atlas-head { grid-template-columns: 1fr 1.2fr; }
  .atlas-head > p { grid-column: 2; }
  .atlas-image-row, .atlas-reverse { grid-template-columns: 1fr 1fr; min-height: 540px; }
  .atlas-image-row > img { min-height: 540px; }
  .process { grid-template-columns: 1fr; }
  .process-visual { height: 540px; min-height: 0; }
  .observation-grid { grid-template-columns: 1fr; }
  .observation figure { width: min(760px, 100%); margin-left: auto; }
  .contact-inner { grid-template-columns: 1fr; gap: 56px; }
  .site-footer { grid-template-columns: 1fr 1fr; }
  .creative-note, .copyright { text-align: left; }
  .copyright { grid-column: 2; }
}

@media (max-width: 720px) {
  :root { --pad: 20px; }
  .site-header { min-height: 70px; padding-block: 10px; background: rgba(243, 239, 229, .98); backdrop-filter: none; }
  .brand-mark { width: 40px; height: 40px; }
  .brand strong { font-size: 14px; }
  .brand small { font-size: 9px; }
  .menu-toggle { display: block; }
  .menu-toggle[aria-expanded="true"] i:first-of-type { transform: translateY(4px) rotate(45deg); }
  .menu-toggle[aria-expanded="true"] i:last-of-type { transform: translateY(-4px) rotate(-45deg); }
  .site-nav { position: fixed; inset: 70px 0 0; display: flex; flex-direction: column; align-items: stretch; justify-content: center; gap: 0; padding: 36px var(--pad); color: var(--paper); background: rgba(23,22,20,.98); transform: translateX(100%); visibility: hidden; transition: transform 240ms ease, visibility 240ms ease; }
  .site-nav.is-open { transform: translateX(0); visibility: visible; }
  .site-nav a { padding: 22px 0; font: 400 32px/1.2 var(--serif); border-bottom: 1px solid rgba(255,255,255,.18); }
  .hero { min-height: 860px; padding-top: 70px; }
  .hero > img { inset: 70px 0 0; height: calc(100% - 70px); object-position: 62% center; }
  .hero::after { inset: 70px 0 0; height: calc(100% - 70px); background: linear-gradient(180deg, rgba(243,239,229,.98) 0%, rgba(243,239,229,.84) 48%, rgba(23,22,20,.08) 100%); }
  .hero-copy { width: 100%; padding: 110px var(--pad) 220px; }
  .hero h1 { font-size: clamp(48px, 15vw, 66px); }
  .hero-lead { font-size: 14px; line-height: 1.8; }
  .hero-actions { align-items: flex-start; flex-direction: column; gap: 16px; }
  .hero-caption { right: var(--pad); bottom: 28px; left: var(--pad); }
  .origin { padding-block: 82px 90px; }
  .origin-heading { gap: 28px; margin-top: 34px; }
  .origin-heading h2, .atlas-head h2, .process-copy > h2, .observation h2, .development h2, .contact h2 { font-size: clamp(40px, 12vw, 56px); }
  .origin-figure { margin-top: 52px; }
  .origin-figure img { aspect-ratio: 4/3; }
  .origin-figure figcaption { grid-template-columns: 1fr; gap: 10px; }
  .atlas-head { grid-template-columns: 1fr; gap: 26px; padding-block: 78px 64px; }
  .atlas-head > p { grid-column: auto; }
  .atlas-starch { grid-template-columns: 58px 1fr; min-height: 0; padding-block: 54px; }
  .atlas-rule { display: none; }
  .atlas-index { font-size: 44px; }
  .atlas-image-row, .atlas-reverse { grid-template-columns: 1fr; min-height: 0; }
  .atlas-image-row > img { min-height: 0; aspect-ratio: 4/3; }
  .atlas-reverse .atlas-copy { order: 2; }
  .atlas-image-row .atlas-copy { max-width: none; padding-block: 54px; }
  .process-visual { height: 390px; }
  .process-copy { padding-block: 84px; }
  .observation { padding-block: 82px 92px; }
  .observation-grid { gap: 48px; margin-top: 40px; }
  .development { padding-block: 82px 94px; }
  .timeline { grid-template-columns: 1fr; margin-top: 64px; border-top: 0; border-left: 1px solid rgba(255,255,255,.28); }
  .timeline li { padding: 0 0 50px 28px; }
  .timeline li::before { top: 4px; left: -6px; }
  .timeline time { font-size: 34px; }
  .contact, .contact-inner { min-height: 0; }
  .contact > img { object-position: 58% center; }
  .contact-inner { padding-block: 84px; }
  .inquiry-form { grid-template-columns: 1fr; padding: 28px 20px; }
  .field-wide { grid-column: auto; }
  .form-actions { align-items: flex-start; flex-direction: column; }
  .site-footer { grid-template-columns: 1fr; padding-block: 44px; }
  .site-footer nav { padding-block: 18px; border-block: 1px solid rgba(255,255,255,.14); }
  .creative-note, .copyright { grid-column: auto; }
}