:root {
  --ink: #172121;
  --ink-soft: #4b5956;
  --paper: #f5f3ed;
  --paper-deep: #eae8e0;
  --line: rgba(23, 33, 33, .16);
  --teal: #2c7770;
  --teal-dark: #1e5e5a;
  --orange: #df6b3f;
  --serif: Georgia, "Noto Serif SC", "Songti SC", serif;
  --sans: Inter, "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --max: 1240px;
  --gutter: clamp(20px, 5vw, 76px);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: var(--sans); line-height: 1.6; }
body, button, a { -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration: none; }
button, a { -webkit-tap-highlight-color: transparent; }
:focus-visible { outline: 3px solid var(--orange); outline-offset: 4px; }
.container { width: min(var(--max), calc(100% - (var(--gutter) * 2))); margin-inline: auto; }
.skip-link { position: fixed; top: 12px; left: 12px; z-index: 20; padding: 8px 14px; background: var(--ink); color: var(--paper); transform: translateY(-160%); }
.skip-link:focus { transform: translateY(0); }

.site-header { position: absolute; inset: 0 0 auto; z-index: 10; }
.header-inner { min-height: 86px; display: flex; align-items: center; justify-content: space-between; border-bottom: 1px solid var(--line); }
.brand { display: inline-flex; align-items: center; gap: 10px; font-size: 17px; font-weight: 700; letter-spacing: .04em; }
.brand-mark { display: grid; width: 31px; height: 31px; place-items: center; border: 1px solid var(--ink); color: var(--teal); font-family: var(--serif); font-size: 19px; }
.site-nav { display: flex; align-items: center; gap: clamp(20px, 3vw, 46px); font-size: 13px; color: var(--ink-soft); }
.site-nav a { transition: color .2s ease; }
.site-nav a:hover { color: var(--teal-dark); }
.nav-system-link { color: var(--teal-dark) !important; }
.nav-system-link span { margin-left: 4px; font-size: 15px; }
.menu-toggle { display: none; border: 0; background: none; color: var(--ink); font: inherit; }
.menu-icon { display: inline-flex; flex-direction: column; gap: 4px; margin-right: 7px; vertical-align: middle; }
.menu-icon i { display: block; width: 18px; height: 1px; background: currentColor; }

.section-band { padding: clamp(88px, 10vw, 150px) 0; }
.hero { position: relative; min-height: 790px; padding-top: 180px; padding-bottom: 96px; overflow: hidden; }
.hero::before { position: absolute; width: 44vw; height: 44vw; min-width: 400px; min-height: 400px; max-width: 710px; max-height: 710px; right: -12vw; top: 6%; border: 1px solid rgba(44, 119, 112, .14); border-radius: 50%; content: ""; }
.hero-grid { position: relative; z-index: 1; display: grid; grid-template-columns: minmax(0, .88fr) minmax(420px, 1.12fr); gap: clamp(42px, 8vw, 130px); align-items: center; }
.eyebrow, .section-kicker { margin: 0 0 24px; color: var(--teal-dark); font-size: 11px; font-weight: 700; letter-spacing: .14em; text-transform: uppercase; }
.eyebrow-line { display: inline-block; width: 34px; height: 1px; margin: 0 10px 3px 0; background: var(--orange); }
h1, h2, h3, p { margin-top: 0; }
h1, h2 { letter-spacing: -.03em; line-height: 1.1; }
h1 { max-width: 660px; margin-bottom: 28px; font-size: clamp(48px, 6vw, 90px); font-weight: 500; }
h1 em { color: var(--teal); font-family: var(--serif); font-style: italic; font-weight: 400; }
.hero-lead { max-width: 500px; margin-bottom: 36px; color: var(--ink-soft); font-size: 16px; }
.hero-actions { display: flex; align-items: center; gap: 26px; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: 0 18px; font-size: 13px; font-weight: 700; transition: background .2s ease, color .2s ease, transform .2s ease; }
.button:hover { transform: translateY(-2px); }
.button-primary { gap: 22px; background: var(--ink); color: var(--paper); }
.button-primary:hover { background: var(--teal-dark); }
.button-text { gap: 10px; padding-inline: 0; color: var(--teal-dark); }
.hero-visual { position: relative; }
.visual-frame { position: relative; padding: 15px 15px 12px; background: var(--teal-dark); color: var(--paper); transform: rotate(1.3deg); box-shadow: 26px 26px 0 rgba(23, 33, 33, .08); }
.visual-topline, .visual-bottomline { display: flex; justify-content: space-between; font-size: 8px; letter-spacing: .18em; opacity: .75; }
.visual-topline { padding: 2px 5px 13px; }
.visual-bottomline { padding: 12px 5px 1px; }
.visual-scene { position: relative; height: clamp(360px, 39vw, 530px); overflow: hidden; background: #c6b9a0; }
.visual-scene::after { position: absolute; inset: 0; background: linear-gradient(125deg, rgba(255,255,255,.18), transparent 45%, rgba(25,35,30,.16)); content: ""; pointer-events: none; }
.scene-paper { position: absolute; display: flex; flex-direction: column; color: var(--ink); background: #eee7d5; box-shadow: 8px 13px 20px rgba(44, 39, 27, .18); }
.scene-paper span, .scene-paper small { font-size: 8px; letter-spacing: .18em; }
.scene-paper b { font-family: var(--serif); font-size: clamp(23px, 3vw, 39px); font-weight: 400; }
.paper-back { top: 10%; left: 9%; width: 33%; height: 37%; padding: 18px; transform: rotate(-7deg); }
.paper-back b { margin-top: auto; }
.paper-front { z-index: 2; right: 16%; bottom: 10%; width: 32%; height: 38%; padding: 16px; transform: rotate(5deg); }
.paper-front b { margin: 15px 0 20px; font-size: clamp(17px, 2vw, 27px); }
.paper-front i { display: block; width: 74%; height: 2px; margin-bottom: 7px; background: #a7a89b; }
.scene-product { position: absolute; z-index: 3; top: 31%; left: 41%; width: 19%; height: 29%; transform: rotate(9deg); filter: drop-shadow(12px 16px 9px rgba(44,39,27,.28)); }
.product-top { position: absolute; top: 0; left: 7%; width: 81%; height: 13%; border-radius: 4px 8px 0 0; background: #83928b; transform: skew(-25deg); }
.product-body { position: absolute; top: 10%; left: 2%; width: 82%; height: 82%; border-radius: 3px; background: #d8d6c9; transform: skewY(-10deg); }
.product-side { position: absolute; top: 13%; right: 0; width: 15%; height: 80%; background: #8b958d; transform: skewY(-10deg); }
.scene-phone { position: absolute; z-index: 4; right: 4%; bottom: 5%; width: 22%; height: 43%; padding: 7px; border: 2px solid #252f2c; border-radius: 15px; background: #252f2c; transform: rotate(-10deg); box-shadow: 11px 16px 11px rgba(44,39,27,.28); }
.phone-screen { display: flex; height: 100%; padding: 16px 10px 10px; flex-direction: column; color: var(--paper); background: #385a53; }
.phone-dot { width: 5px; height: 5px; margin-bottom: 24px; border-radius: 50%; background: var(--orange); }
.phone-screen strong { font-family: var(--serif); font-size: clamp(13px, 1.7vw, 23px); font-weight: 400; line-height: 1.1; }
.phone-screen small { margin-top: auto; font-size: 7px; opacity: .72; }
.phone-chart { display: flex; height: 50px; align-items: end; gap: 4px; margin-top: 13px; }
.phone-chart i { display: block; width: 7px; background: var(--orange); }
.phone-chart i:nth-child(1) { height: 32%; }.phone-chart i:nth-child(2) { height: 52%; }.phone-chart i:nth-child(3) { height: 41%; }.phone-chart i:nth-child(4) { height: 74%; }.phone-chart i:nth-child(5) { height: 90%; }
.scene-line { position: absolute; z-index: 5; height: 1px; background: var(--orange); transform-origin: left; }
.line-one { top: 26%; left: 57%; width: 24%; transform: rotate(-28deg); }.line-two { left: 19%; bottom: 27%; width: 19%; transform: rotate(35deg); }
.scene-label { position: absolute; z-index: 6; color: var(--ink); font-size: 8px; font-weight: 700; letter-spacing: .15em; }.label-a { top: 19%; right: 8%; }.label-b { bottom: 21%; left: 9%; }
.hero-scroll { position: absolute; z-index: 2; bottom: 34px; left: var(--gutter); display: flex; align-items: center; gap: 15px; color: var(--ink-soft); font-size: 10px; letter-spacing: .12em; writing-mode: vertical-rl; }.hero-scroll i { display: block; width: 1px; height: 45px; background: var(--orange); }

.business { background: var(--paper-deep); }
.section-intro { margin-bottom: 70px; }.split-intro { display: grid; grid-template-columns: 1fr 1fr; gap: 10%; align-items: end; }
h2 { margin-bottom: 0; font-size: clamp(36px, 4.2vw, 64px); font-weight: 500; }.section-intro h2 span, .cooperation h2 span, .about h2 span, .contact h2 span { color: var(--teal); font-family: var(--serif); font-weight: 400; }.section-summary { max-width: 450px; margin: 0; color: var(--ink-soft); font-size: 15px; }
.business-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }.business-card { min-height: 490px; display: flex; flex-direction: column; padding: 30px; border: 1px solid var(--line); }.business-cps { background: var(--paper); }.business-commerce { background: var(--teal); color: var(--paper); border-color: var(--teal); }.card-head { display: flex; justify-content: space-between; align-items: center; }.card-number { font-family: var(--serif); font-size: 42px; line-height: 1; }.card-tag { font-size: 9px; letter-spacing: .16em; opacity: .65; }.card-body { max-width: 420px; margin: auto 0 40px; }.card-body h3 { margin-bottom: 15px; font-family: var(--serif); font-size: clamp(27px, 3vw, 42px); font-weight: 400; }.card-body p { max-width: 370px; margin-bottom: 23px; color: var(--ink-soft); font-size: 14px; }.business-commerce .card-body p { color: rgba(245,243,237,.75); }.card-link { display: inline-flex; gap: 15px; color: var(--teal-dark); font-size: 12px; font-weight: 700; }.business-commerce .card-link { color: #d5e8d9; }.feature-list { display: grid; grid-template-columns: 1fr 1fr; gap: 10px 20px; padding: 20px 0 0; margin: 0; border-top: 1px solid var(--line); list-style: none; color: var(--ink-soft); font-size: 12px; }.business-commerce .feature-list { border-color: rgba(245,243,237,.25); color: rgba(245,243,237,.8); }.feature-list li::before { margin-right: 8px; color: var(--orange); content: "+"; }

.method { background: var(--ink); color: var(--paper); }.method .section-kicker { color: #9bcac0; }.method .section-summary { color: rgba(245,243,237,.65); }.method-list { border-top: 1px solid rgba(245,243,237,.25); }.method-item { display: grid; grid-template-columns: 100px 1fr 30px; gap: 22px; align-items: center; padding: 25px 0; border-bottom: 1px solid rgba(245,243,237,.25); }.method-number { color: var(--orange); font-family: var(--serif); font-size: 25px; }.method-item h3 { display: flex; align-items: baseline; gap: 15px; margin: 0 0 5px; font-family: var(--serif); font-size: clamp(23px, 2.5vw, 34px); font-weight: 400; }.method-item h3 small { color: rgba(245,243,237,.45); font-family: var(--sans); font-size: 9px; letter-spacing: .15em; }.method-item p { margin: 0; color: rgba(245,243,237,.6); font-size: 13px; }.method-arrow { color: #9bcac0; font-size: 24px; }

.cooperation { background: #d8e4dd; }.cooperation-grid, .about-grid, .contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10%; }.cooperation-lead, .contact-copy { max-width: 360px; margin-top: 30px; color: var(--ink-soft); font-size: 15px; }.cooperation-items { border-top: 1px solid var(--line); }.cooperation-items article { display: grid; grid-template-columns: 52px 1fr; gap: 20px; padding: 23px 0; border-bottom: 1px solid var(--line); }.cooperation-items article > span { color: var(--orange); font-family: var(--serif); font-size: 20px; }.cooperation-items h3 { margin-bottom: 5px; font-family: var(--serif); font-size: 24px; font-weight: 400; }.cooperation-items p { max-width: 410px; margin: 0; color: var(--ink-soft); font-size: 13px; }
.about { background: var(--paper); }.about-copy { padding-top: 58px; }.about-copy > p:first-child { max-width: 510px; margin-bottom: 42px; font-family: var(--serif); font-size: clamp(22px, 2.5vw, 32px); line-height: 1.45; }.about-note { max-width: 430px; padding-left: 18px; border-left: 2px solid var(--orange); color: var(--ink-soft); font-size: 13px; }
.contact { background: var(--orange); color: var(--ink); }.contact .section-kicker { color: var(--ink); }.contact h2 span { color: #f6eadb; }.contact-copy { color: rgba(23,33,33,.75); }.contact-panel { align-self: end; padding: 29px; background: var(--paper); }.contact-status { margin-bottom: 12px; color: var(--teal-dark); font-size: 12px; font-weight: 700; letter-spacing: .08em; }.contact-panel > p:not(.contact-status) { max-width: 420px; color: var(--ink-soft); font-size: 14px; }.contact-panel .button { margin-top: 12px; }.contact-hint { margin: 18px 0 0 !important; color: var(--ink-soft); font-size: 12px !important; }
.site-footer { background: var(--ink); color: var(--paper); }.footer-top { display: grid; grid-template-columns: 1fr 1fr 1fr; align-items: center; min-height: 116px; border-bottom: 1px solid rgba(245,243,237,.2); }.footer-top .brand-mark { border-color: var(--paper); color: #9bcac0; }.footer-top p { margin: 0; color: rgba(245,243,237,.6); font-family: var(--serif); font-size: 17px; }.back-top { justify-self: end; color: #9bcac0; font-size: 12px; }.footer-bottom { display: flex; justify-content: space-between; gap: 20px; padding: 20px 0 24px; color: rgba(245,243,237,.45); font-size: 10px; letter-spacing: .04em; }.footer-bottom a { color: #9bcac0; text-decoration: underline; text-underline-offset: 3px; }.footer-bottom a:hover { color: var(--paper); }

@media (max-width: 820px) { .hero-grid, .split-intro, .cooperation-grid, .about-grid, .contact-grid { grid-template-columns: 1fr; gap: 45px; }.hero { min-height: auto; padding-top: 150px; }.hero-visual { max-width: 680px; }.about-copy { padding-top: 0; }.contact-panel { max-width: 560px; }.hero-scroll { display: none; } }
@media (max-width: 700px) { :root { --gutter: 20px; }.header-inner { min-height: 72px; }.menu-toggle { display: flex; align-items: center; }.site-nav { position: absolute; top: 72px; right: var(--gutter); left: var(--gutter); display: none; padding: 15px; flex-direction: column; align-items: stretch; gap: 0; border: 1px solid var(--line); background: var(--paper); box-shadow: 10px 12px 0 rgba(23,33,33,.08); }.site-nav.is-open { display: flex; }.site-nav a { padding: 12px 8px; border-bottom: 1px solid var(--line); }.site-nav a:last-child { border-bottom: 0; }.hero { padding-top: 125px; }.hero-grid { gap: 52px; }.hero-visual { width: calc(100% + 8px); margin-left: -4px; }.visual-frame { box-shadow: 12px 14px 0 rgba(23,33,33,.08); }.visual-scene { height: min(105vw, 440px); }.hero-actions { gap: 20px; }.button { min-height: 45px; }.section-band { padding: 85px 0; }.section-intro { margin-bottom: 45px; }.business-grid { grid-template-columns: 1fr; }.business-card { min-height: 460px; padding: 23px; }.method-item { grid-template-columns: 48px 1fr 20px; gap: 12px; }.method-item h3 { display: block; }.method-item h3 small { display: block; margin-top: 4px; }.footer-top { grid-template-columns: 1fr auto; gap: 20px; }.footer-top p { display: none; }.footer-bottom { flex-wrap: wrap; gap: 8px 18px; } }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; } }