:root {
  --paper: #f6f2e9;
  --paper-deep: #eee8dc;
  --ink: #231f1b;
  --muted: #6d665d;
  --line: #d9d0c2;
  --wine: #6e1f2a;
  --wine-dark: #50151e;
  --signal: #b44350;
  --blue: #315f73;
  --white: #fffdf8;
  --green: #426a51;
  --shadow: 0 18px 50px rgba(64, 45, 31, .08);
  --radius: 22px;
  --max: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  padding-top: 76px;
  color: var(--ink);
  background:
    radial-gradient(circle at 5% 8%, rgba(110,31,42,.07), transparent 28rem),
    radial-gradient(circle at 94% 28%, rgba(49,95,115,.055), transparent 30rem),
    var(--paper);
  font-family: "PingFang SC", "Noto Sans CJK SC", "Microsoft YaHei", system-ui, sans-serif;
  line-height: 1.7;
}

a { color: inherit; }
img { max-width: 100%; }
button, input, textarea, select { font: inherit; }
.wrap { width: min(calc(100% - 40px), var(--max)); margin: 0 auto; }
.skip { position: fixed; left: 14px; top: -60px; z-index: 100; padding: 9px 14px; background: var(--ink); color: white; }
.skip:focus { top: 14px; }

.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  background: rgba(246,242,233,.9);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(110,31,42,.1);
}
.site-header.scrolled { box-shadow: 0 8px 30px rgba(45,31,24,.09); }
.nav-shell { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 13px; text-decoration: none; }
.brand-mark { width: 38px; height: 38px; position: relative; border: 1px solid var(--wine); border-radius: 50%; }
.brand-mark::before { content: ""; position: absolute; width: 6px; height: 6px; background: var(--wine); border-radius: 50%; left: 7px; top: 15px; box-shadow: 15px -8px 0 -1px rgba(110,31,42,.65), 19px 8px 0 -2px rgba(49,95,115,.65); }
.brand-mark::after { content: ""; position: absolute; width: 21px; height: 1px; background: var(--wine); left: 8px; top: 18px; transform: rotate(-18deg); box-shadow: 2px 6px 0 rgba(49,95,115,.55); }
.brand-zh { font-family: "Songti SC", "STSong", serif; font-size: 25px; letter-spacing: .22em; font-weight: 700; }
.brand-en { display: block; margin-top: -5px; color: var(--wine); font-size: 9px; letter-spacing: .34em; }
.desktop-nav { display: flex; align-items: center; gap: 26px; }
.desktop-nav a { color: var(--muted); text-decoration: none; font-size: 14px; }
.desktop-nav a:hover, .desktop-nav a[aria-current="page"] { color: var(--wine); }
.nav-actions { display: flex; align-items: center; gap: 10px; }
.btn { display: inline-flex; justify-content: center; align-items: center; gap: 8px; min-height: 46px; padding: 0 19px; border: 1px solid var(--wine); border-radius: 999px; background: var(--wine); color: white; font-weight: 650; text-decoration: none; cursor: pointer; transition: .2s ease; }
.btn:hover { background: var(--wine-dark); border-color: var(--wine-dark); transform: translateY(-1px); }
.btn.ghost { color: var(--wine); background: transparent; }
.btn.ghost:hover { color: white; background: var(--wine); }
.btn.text { border: 0; background: transparent; color: var(--muted); padding-inline: 10px; font-weight: 500; }
.btn.text:hover { color: var(--wine); background: transparent; transform: none; }
.menu-btn { display: none; border: 0; background: none; width: 44px; height: 44px; font-size: 23px; }

.eyebrow { margin: 0 0 14px; color: var(--wine); font-size: 12px; font-weight: 700; letter-spacing: .22em; text-transform: uppercase; }
.hero { min-height: 700px; display: grid; grid-template-columns: 1.03fr .97fr; align-items: center; gap: 68px; padding: 80px 0 70px; }
.hero h1, .page-hero h1 { margin: 0; font-family: "Songti SC", "STSong", serif; font-weight: 700; line-height: 1.12; letter-spacing: -.035em; }
.hero h1 { font-size: clamp(48px, 5.2vw, 66px); }
.hero h1 em { display: block; color: var(--wine); font-style: normal; }
.lead { max-width: 680px; margin: 24px 0 0; color: var(--muted); font-size: 18px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 34px; }
.proof-line { display: flex; flex-wrap: wrap; gap: 18px; margin-top: 38px; padding-top: 25px; border-top: 1px solid var(--line); color: var(--muted); font-size: 13px; }
.proof-line span::before { content: "·"; margin-right: 9px; color: var(--wine); font-size: 18px; }
.hero-note { max-width: 600px; margin: 18px 0 0; color: var(--muted); font-size: 12px; }

.signal-map { position: relative; min-height: 490px; border: 1px solid var(--line); border-radius: 34px; background: rgba(255,253,248,.72); box-shadow: var(--shadow); overflow: hidden; }
.signal-map::before { content: ""; position: absolute; inset: 0; background-image: linear-gradient(rgba(110,31,42,.05) 1px, transparent 1px), linear-gradient(90deg, rgba(110,31,42,.05) 1px, transparent 1px); background-size: 34px 34px; mask-image: linear-gradient(to bottom, black, transparent); }
.map-caption { position: absolute; left: 28px; top: 24px; color: var(--muted); font-size: 11px; letter-spacing: .15em; }
.map-line { position: absolute; left: 73px; right: 72px; top: 50%; height: 1px; background: linear-gradient(90deg, var(--wine), var(--blue)); }
.map-node { position: absolute; width: 104px; min-height: 78px; padding: 13px 11px; text-align: center; border: 1px solid var(--line); border-radius: 15px; background: var(--white); box-shadow: 0 8px 24px rgba(60,40,25,.08); transform: translate(-50%,-50%); }
.map-node strong { display: block; font-size: 15px; }
.map-node small { color: var(--muted); font-size: 10px; }
.map-node::before { content: ""; display: block; width: 8px; height: 8px; margin: -18px auto 10px; border: 4px solid var(--paper); border-radius: 50%; background: var(--wine); }
.map-node.n1 { left: 16%; top: 50%; }
.map-node.n2 { left: 38%; top: 50%; }
.map-node.n3 { left: 61%; top: 50%; }
.map-node.n4 { left: 84%; top: 50%; }
.map-node.n4::before { background: var(--blue); }
.map-result { position: absolute; left: 50%; bottom: 38px; transform: translateX(-50%); width: 72%; padding: 17px; border-left: 3px solid var(--wine); background: var(--paper-deep); font-family: "Songti SC", serif; font-size: 17px; }
.pulse { position: absolute; z-index: 2; left: 15%; top: calc(50% - 4px); width: 9px; height: 9px; border-radius: 50%; background: var(--signal); box-shadow: 0 0 0 7px rgba(180,67,80,.15); animation: travel 7s ease-in-out infinite; }
@keyframes travel { 0%,8% { left: 15%; } 28% { left: 38%; } 52% { left: 61%; } 76%,100% { left: 84%; } }

.section { padding: 105px 0; }
.section.tight { padding: 74px 0; }
.section.alt { background: rgba(255,253,248,.58); border-block: 1px solid rgba(110,31,42,.08); }
.section-head { display: grid; grid-template-columns: .8fr 1.2fr; gap: 50px; align-items: end; margin-bottom: 50px; }
.section-head h2 { margin: 0; font-family: "Songti SC", serif; font-size: clamp(34px, 4vw, 52px); line-height: 1.2; }
.section-head p { margin: 0; color: var(--muted); font-size: 17px; }
.cards { display: grid; grid-template-columns: repeat(3,1fr); gap: 18px; }
.offer-grid { display: grid; grid-template-columns: 1.25fr .875fr .875fr; gap: 18px; }
.offer { padding: 30px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--white); }
.offer.primary { border-color: var(--wine); background: linear-gradient(145deg, #fffdf8, #f2e9e3); }
.offer > span { color: var(--wine); font-size: 12px; font-weight: 700; letter-spacing: .08em; }
.offer h3 { margin: 24px 0 12px; font-size: 25px; }
.offer p, .offer li { color: var(--muted); }
.offer .btn { margin-top: 16px; }
.team-grid { display: grid; grid-template-columns: repeat(2,1fr); gap: 15px; }
.team-card { padding: 24px; border: 1px solid var(--line); border-radius: 14px; background: var(--white); }
.team-card h3 { margin: 0 0 5px; }
.team-card small { color: var(--wine); font-weight: 700; }
.team-card p { margin-bottom: 0; }
.evidence-chain { display: grid; grid-template-columns: repeat(3,1fr); gap: 14px; }
.evidence-chain article { padding: 24px; border-top: 2px solid var(--wine); background: var(--white); }
.evidence-chain small { color: var(--wine); font-weight: 700; }
.service-grid { display: grid; grid-template-columns: repeat(5,1fr); gap: 12px; }
.service-grid article { min-height: 260px; padding: 24px 20px; border-top: 2px solid var(--wine); background: rgba(255,253,248,.7); }
.service-grid b { color: var(--wine); font-size: 12px; }
.service-grid h3 { margin: 48px 0 10px; font-size: 20px; }
.service-grid p { margin: 0; color: var(--muted); font-size: 14px; }
.industry-grid { display: grid; grid-template-columns: repeat(6,1fr); gap: 14px; }
.industry-grid a { grid-column: span 2; min-height: 240px; padding: 26px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--white); text-decoration: none; transition: .2s ease; }
.industry-grid a:nth-child(4), .industry-grid a:nth-child(5) { grid-column: span 3; }
.industry-grid a:hover { transform: translateY(-3px); border-color: rgba(110,31,42,.4); box-shadow: var(--shadow); }
.industry-grid h3 { margin: 48px 0 9px; font-size: 22px; }
.industry-grid p { margin: 0; color: var(--muted); }
.status { display: inline-flex; padding: 4px 9px; border-radius: 999px; font-size: 11px; font-weight: 700; }
.status.live { color: var(--green); background: rgba(66,106,81,.1); }
.status.pilot { color: var(--wine); background: rgba(110,31,42,.1); }
.status.research { color: var(--blue); background: rgba(49,95,115,.1); }
.card { position: relative; padding: 28px; border: 1px solid var(--line); border-radius: var(--radius); background: rgba(255,253,248,.72); }
.card-num { display: block; margin-bottom: 34px; color: var(--wine); font-size: 11px; letter-spacing: .2em; }
.card h3 { margin: 0 0 10px; font-size: 21px; }
.card p { margin: 0; color: var(--muted); }
.card a { display: inline-block; margin-top: 18px; color: var(--wine); text-decoration: none; font-weight: 650; }
.card.signal { border-color: rgba(110,31,42,.35); background: linear-gradient(145deg, #fffdf8, #f2e9e3); }
.problem-grid { display: grid; grid-template-columns: repeat(2,1fr); gap: 18px; }
.problem { padding: 26px 28px; border-top: 1px solid var(--line); }
.problem strong { display: block; margin-bottom: 7px; font-size: 19px; }
.problem span { color: var(--muted); }
.problem::before { content: ""; display: block; width: 7px; height: 7px; margin-bottom: 18px; border-radius: 50%; background: var(--wine); }

.loop { display: grid; grid-template-columns: repeat(6,1fr); gap: 8px; }
.loop-step { min-height: 142px; padding: 19px 16px; border: 1px solid var(--line); background: var(--white); }
.loop-step:first-child { border-radius: 18px 0 0 18px; }
.loop-step:last-child { border-radius: 0 18px 18px 0; }
.loop-step small { color: var(--wine); }
.loop-step strong { display: block; margin-top: 28px; }
.principle { margin-top: 28px; padding: 22px 26px; border-left: 3px solid var(--blue); background: rgba(49,95,115,.07); color: var(--muted); }

.origin { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.origin-visual { min-height: 450px; padding: 38px; border-radius: 28px; background: var(--ink); color: var(--paper); box-shadow: var(--shadow); }
.origin-visual .stamp { display: inline-block; padding: 6px 10px; border: 1px solid rgba(255,255,255,.35); border-radius: 999px; color: #dcbac0; font-size: 11px; letter-spacing: .14em; }
.origin-visual blockquote { margin: 85px 0 55px; font-family: "Songti SC", serif; font-size: 32px; line-height: 1.45; }
.origin-visual p { color: #beb7ae; }
.origin-copy h2 { margin: 0 0 20px; font-family: "Songti SC", serif; font-size: 48px; line-height: 1.2; }
.origin-copy p { color: var(--muted); font-size: 17px; }
.origin-list { display: grid; gap: 16px; margin-top: 30px; }
.origin-list div { display: grid; grid-template-columns: 44px 1fr; gap: 14px; }
.origin-list b { color: var(--wine); font-size: 12px; }

.pilot-band { padding: 70px 0; background: var(--wine); color: white; }
.pilot-inner { display: grid; grid-template-columns: 1fr auto; gap: 40px; align-items: center; }
.pilot-inner h2 { margin: 0; font-family: "Songti SC", serif; font-size: 42px; }
.pilot-inner p { margin: 10px 0 0; color: #e1cbd0; }
.pilot-band .btn { border-color: white; background: white; color: var(--wine); }

.page-hero { padding: 110px 0 80px; border-bottom: 1px solid var(--line); }
.page-hero h1 { max-width: 900px; font-size: clamp(46px, 6vw, 72px); }
.page-hero .lead { max-width: 760px; }
.breadcrumb { margin-bottom: 34px; color: var(--muted); font-size: 12px; }
.breadcrumb a { text-decoration: none; }
.content-grid { display: grid; grid-template-columns: 280px 1fr; gap: 70px; }
.side-note { position: sticky; top: 110px; align-self: start; padding: 24px; border-left: 2px solid var(--wine); background: rgba(255,253,248,.58); color: var(--muted); }
.article h2 { margin: 0 0 16px; font-family: "Songti SC", serif; font-size: 36px; }
.article h3 { margin-top: 42px; font-size: 23px; }
.article p, .article li { color: var(--muted); font-size: 16px; }
.article section + section { margin-top: 76px; padding-top: 65px; border-top: 1px solid var(--line); }
.result-list { display: grid; grid-template-columns: repeat(3,1fr); gap: 14px; margin: 28px 0; }
.result { padding: 20px; border: 1px solid var(--line); border-radius: 14px; background: var(--white); }
.result b { color: var(--wine); }

.timeline { position: relative; margin-top: 45px; }
.service-detail { display: grid; gap: 0; }
.service-detail article { display: grid; grid-template-columns: 140px 1fr 1.2fr; gap: 35px; padding: 54px 0; border-top: 1px solid var(--line); }
.service-detail article > span { color: var(--wine); font-size: 11px; letter-spacing: .12em; }
.service-detail h2 { margin: 0; font-family: "Songti SC", serif; font-size: 32px; }
.service-detail p, .service-detail li { color: var(--muted); }
.service-detail p, .service-detail ul { margin-top: 0; }
.industry-sections { display: grid; gap: 90px; }
.industry-sections article { scroll-margin-top: 110px; display: grid; grid-template-columns: .9fr 1.1fr; gap: 70px; padding-top: 30px; border-top: 1px solid var(--line); }
.industry-title h2 { margin: 15px 0; font-family: "Songti SC", serif; font-size: 45px; }
.industry-title p { color: var(--muted); }
.industry-title .eyebrow { margin-top: 25px; }
.industry-use { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; align-content: start; }
.industry-use b { grid-column: 1/-1; margin-bottom: 10px; }
.industry-use span { padding: 16px; border: 1px solid var(--line); border-radius: 10px; background: var(--white); color: var(--muted); }
.product-stack { display: grid; gap: 35px; }
.product-main { display: grid; grid-template-columns: 1.3fr .7fr; gap: 60px; padding: 50px; border-radius: 28px; background: var(--ink); color: var(--paper); }
.product-main h2 { margin: 8px 0 18px; font-family: "Songti SC", serif; font-size: 48px; }
.product-main p { color: #c0b8af; }
.product-main .eyebrow { margin-top: 28px; color: #dcbac0; }
.product-main .btn.ghost { color: white; border-color: rgba(255,255,255,.5); }
.product-cap { display: grid; gap: 10px; align-content: center; }
.product-cap b { margin-bottom: 10px; }
.product-cap span { padding: 13px 15px; border: 1px solid #49423d; border-radius: 9px; color: #c0b8af; }
.timeline::before { content: ""; position: absolute; left: 15px; top: 8px; bottom: 8px; width: 1px; background: var(--line); }
.time-item { position: relative; padding: 0 0 42px 55px; }
.time-item::before { content: ""; position: absolute; left: 9px; top: 7px; width: 13px; height: 13px; border-radius: 50%; border: 3px solid var(--paper); background: var(--wine); box-shadow: 0 0 0 1px var(--wine); }
.time-item h3 { margin: 0 0 7px; }
.time-item p { margin: 0; color: var(--muted); }

.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 17px; }
.field { display: grid; gap: 7px; }
.field.full { grid-column: 1 / -1; }
.field label { color: var(--muted); font-size: 13px; }
.field input, .field select, .field textarea { width: 100%; padding: 13px 14px; color: var(--ink); border: 1px solid var(--line); border-radius: 10px; background: var(--white); }
.field textarea { min-height: 130px; resize: vertical; }
#form-output { width: 100%; min-height: 220px; margin-top: 18px; padding: 15px; border: 1px solid var(--line); border-radius: 10px; background: var(--paper-deep); color: var(--ink); }
.field input:focus, .field select:focus, .field textarea:focus { outline: 2px solid rgba(110,31,42,.15); border-color: var(--wine); }
.form-status { margin-top: 15px; color: var(--green); }
.honeypot { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }
.form-status.error { color: var(--wine); }

.site-footer { padding: 65px 0 30px; background: #211d1a; color: #eee7dc; }
.footer-grid { display: grid; grid-template-columns: 1.4fr .8fr .8fr; gap: 60px; }
.footer-grid h3 { margin: 0 0 13px; font-family: "Songti SC", serif; font-size: 25px; }
.footer-grid p, .footer-grid a { color: #aaa198; font-size: 13px; }
.footer-grid a { display: block; margin: 8px 0; text-decoration: none; }
.footer-bottom { display: flex; justify-content: space-between; gap: 20px; margin-top: 48px; padding-top: 22px; border-top: 1px solid #3d3732; color: #867e76; font-size: 11px; }
.footer-bottom .footer-inline { display: inline; margin: 0; color: #aaa198; }
.footer-legal { display: flex; flex-wrap: wrap; gap: 18px; margin-top: 36px; }
.footer-legal a { color: #aaa198; font-size: 12px; text-decoration: none; }
.trust-grid { display: grid; grid-template-columns: repeat(2,1fr); gap: 16px; }
.trust-item { padding: 24px; border: 1px solid var(--line); border-radius: 14px; background: var(--white); }
.trust-item b { display: block; margin-bottom: 8px; color: var(--wine); }
.trust-item p { margin: 0; color: var(--muted); }
.disclosure { padding: 20px 24px; border-left: 3px solid var(--blue); background: rgba(49,95,115,.07); color: var(--muted); }

:focus-visible { outline: 3px solid rgba(49,95,115,.55); outline-offset: 3px; }
::selection { color: white; background: var(--wine); }

@media (max-width: 940px) {
  .offer-grid, .team-grid, .evidence-chain { grid-template-columns: 1fr; }
  .desktop-nav, .nav-actions .btn.text { display: none; }
  .menu-btn { display: block; }
  .desktop-nav.open { display: flex; position: absolute; left: 0; right: 0; top: 76px; padding: 20px; flex-direction: column; align-items: flex-start; background: var(--paper); border-bottom: 1px solid var(--line); }
  .desktop-nav.open { max-height: calc(100dvh - 76px); overflow-y: auto; }
  body.menu-open { overflow: hidden; }
  .hero { grid-template-columns: 1fr; min-height: auto; }
  .signal-map { min-height: 430px; }
  .section-head, .origin, .content-grid { grid-template-columns: 1fr; }
  .cards { grid-template-columns: 1fr 1fr; }
  .service-grid { grid-template-columns: 1fr 1fr; }
  .industry-grid { grid-template-columns: 1fr 1fr; }
  .industry-grid a, .industry-grid a:nth-child(4), .industry-grid a:nth-child(5) { grid-column: auto; }
  .service-detail article { grid-template-columns: 100px 1fr; }
  .service-detail article ul { grid-column: 2; }
  .industry-sections article, .product-main { grid-template-columns: 1fr; }
  .loop { grid-template-columns: repeat(3,1fr); }
  .loop-step:first-child, .loop-step:last-child { border-radius: 0; }
  .side-note { position: static; }
}

@media (max-width: 650px) {
  body { padding-top: 68px; }
  .wrap { width: min(calc(100% - 28px), var(--max)); }
  .nav-shell { min-height: 68px; }
  .desktop-nav.open { top: 68px; }
  .desktop-nav.open { max-height: calc(100dvh - 68px); }
  .nav-actions > .btn { min-height: 39px; padding-inline: 13px; font-size: 12px; }
  .brand-en { display: none; }
  .hero { padding-top: 65px; gap: 42px; }
  .hero h1 { font-size: 44px; }
  .lead { font-size: 16px; }
  .signal-map { min-height: 510px; }
  .map-line { top: 60px; bottom: 100px; left: 50%; width: 1px; height: auto; background: linear-gradient(var(--wine), var(--blue)); }
  .map-node { left: 50% !important; width: 150px; min-height: 70px; }
  .map-node.n1 { top: 18%; } .map-node.n2 { top: 36%; } .map-node.n3 { top: 54%; } .map-node.n4 { top: 72%; }
  .map-node::before { margin: -18px auto 8px; }
  .pulse { display: none; }
  .map-result { bottom: 18px; width: 86%; font-size: 14px; padding: 12px; }
  .section { padding: 75px 0; }
  .section-head { gap: 18px; margin-bottom: 34px; }
  .cards, .problem-grid, .result-list, .form-grid { grid-template-columns: 1fr; }
  .service-grid, .industry-grid { grid-template-columns: 1fr; }
  .service-detail article { grid-template-columns: 1fr; gap: 14px; }
  .service-detail article ul { grid-column: auto; }
  .industry-sections article { gap: 25px; }
  .industry-use { grid-template-columns: 1fr; }
  .industry-use b { grid-column: auto; }
  .product-main { padding: 28px; gap: 30px; }
  .product-main h2 { font-size: 37px; }
  .field.full { grid-column: auto; }
  .loop { grid-template-columns: 1fr 1fr; }
  .origin-visual { min-height: 370px; padding: 25px; }
  .origin-visual blockquote { margin: 65px 0 45px; font-size: 26px; }
  .origin-copy h2 { font-size: 38px; }
  .pilot-inner { grid-template-columns: 1fr; }
  .pilot-inner h2 { font-size: 34px; }
  .page-hero { padding: 75px 0 58px; }
  .footer-grid { grid-template-columns: 1fr; gap: 30px; }
  .trust-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; }
}