:root {
  --bg: #ffffff;
  --bg-alt: #f7f7f5;
  --ink: #141414;
  --muted: #6e6e69;
  --muted-dark: #bdbdb7;
  --red: #a32f1f;
  --red-hover: #8a2818;
  --line: #e3e1da;
  --button-line: #d8d5cc;
  --ease: cubic-bezier(.4, 0, .2, 1);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Helvetica Neue", Arial, sans-serif;
  --font-serif: "Songti SC", "Noto Serif SC", "STSong", "SimSun", serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; text-rendering: optimizeLegibility; }
body { margin: 0; background: var(--bg); color: var(--ink); font-family: var(--font-sans); }
body, h1, h2, h3, p { word-break: normal; overflow-wrap: break-word; line-break: strict; }
h1, h2 { text-wrap: balance; }
a { color: inherit; text-decoration: none; }
.container { width: min(1200px, calc(100% - 80px)); margin-inline: auto; }
.skip-link { position: fixed; left: 16px; top: -80px; z-index: 1000; padding: 12px 16px; background: var(--ink); color: #fff; border-radius: 8px; }
.skip-link:focus { top: 16px; }

.site-header { position: sticky; top: 0; z-index: 100; height: 80px; display: flex; align-items: center; background: rgba(255,255,255,.98); border-bottom: 1px solid var(--line); transition: box-shadow 200ms var(--ease), background 200ms var(--ease); }
.site-header.is-scrolled { background: rgba(255,255,255,.92); backdrop-filter: blur(12px); box-shadow: 0 4px 16px rgba(20,20,20,.06); }
.header-inner { display: flex; align-items: center; justify-content: space-between; }
.brand { display: inline-flex; align-items: baseline; gap: 8px; min-height: 44px; }
.brand-en { font-size: 19px; font-weight: 600; }
.brand-cn { color: var(--muted); font-size: 15px; }
.desktop-nav { display: flex; align-items: center; gap: 30px; }
.desktop-nav > a:not(.button) { min-height: 44px; padding: 14px 4px 12px; border-bottom: 2px solid transparent; font-size: 14px; font-weight: 500; transition: border-color 160ms var(--ease); }
.desktop-nav > a:not(.button):hover { border-bottom-color: var(--red); }
.desktop-nav > a:focus-visible, .text-link:focus-visible { outline: 2px solid var(--ink); outline-offset: 3px; }
.menu-button { display: none; width: 44px; height: 44px; padding: 0; border: 1px solid var(--line); border-radius: 8px; background: #fff; cursor: pointer; }
.menu-button span { display: block; width: 22px; height: 2px; margin: 4px auto; background: var(--ink); }

.button { display: inline-flex; align-items: center; justify-content: center; gap: 8px; height: 48px; padding-inline: 24px; border: 1px solid transparent; border-radius: 8px; font: 600 15px/1 var(--font-sans); transition: background 160ms var(--ease), border-color 160ms var(--ease), box-shadow 160ms var(--ease), transform 80ms var(--ease); }
.button-compact { height: 44px; padding-inline: 18px; }
.button-primary { background: var(--ink); color: #fff; }
.button-primary:hover { background: #262626; box-shadow: 0 2px 8px rgba(20,20,20,.18); }
.button-primary:active { background: #000; transform: scale(.98); }
.button-secondary { border-color: var(--button-line); background: transparent; }
.button-secondary:hover { border-color: var(--ink); background: var(--bg-alt); }
.button-secondary:active { background: #edebe6; transform: scale(.98); }
.button:focus-visible { outline: 0; box-shadow: 0 0 0 2px #fff, 0 0 0 4px var(--ink); }

.hero { padding-block: 116px 104px; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 7fr) minmax(360px, 5fr); gap: 70px; align-items: center; }
.kicker, .eyebrow { margin: 0; font-size: 12px; line-height: 1.6; letter-spacing: .08em; font-weight: 600; }
.kicker { display: flex; align-items: center; gap: 10px; color: var(--muted); }
.kicker span { width: 8px; height: 8px; border-radius: 4px; background: var(--red); }
.eyebrow { color: var(--red); }
h1 { max-width: 760px; margin: 24px 0; font-size: 54px; line-height: 1.28; font-weight: 600; letter-spacing: 0; }
.hero-lede { max-width: 640px; margin: 0; color: var(--muted); font-size: 18px; line-height: 1.8; }
.hero-actions { display: flex; gap: 16px; margin-top: 38px; }
.legal-note { max-width: 650px; margin: 26px 0 0; color: var(--muted); font-size: 13px; line-height: 1.7; }

.intent-visual { min-width: 0; }
.intent-visual svg { display: block; width: 100%; height: auto; }
.visual-frame, .visual-line, .visual-path { fill: none; stroke: var(--line); vector-effect: non-scaling-stroke; }
.visual-frame { stroke: var(--ink); }
.visual-path { stroke: var(--ink); stroke-width: 1.5; stroke-dasharray: 4 7; animation: path-flow 8s linear infinite; }
.visual-label, .visual-index, .visual-caption, .visual-step { font-family: var(--font-sans); fill: var(--ink); }
.visual-label, .visual-index, .visual-caption { font-size: 11px; letter-spacing: 1.6px; }
.visual-index { fill: var(--muted); }
.visual-step { font-size: 15px; }
.visual-node { fill: var(--red); transform-box: fill-box; transform-origin: center; animation: node-pulse 3.2s var(--ease) infinite; }
.node-two { animation-delay: .4s; }.node-three { animation-delay: .8s; }.node-four { animation-delay: 1.2s; }
@keyframes path-flow { to { stroke-dashoffset: -88; } }
@keyframes node-pulse { 0%, 70%, 100% { transform: scale(1); } 35% { transform: scale(1.5); } }

.industry-strip { border-block: 1px solid var(--line); padding-block: 24px; }
.industry-strip-inner { display: flex; flex-wrap: wrap; gap: 12px 32px; color: var(--muted); font-size: 14px; }
.industry-strip-inner strong { color: var(--ink); }
.industry-strip-inner span::before { content: "/"; margin-right: 32px; color: #c4c2bc; }
.statement { padding-block: 110px; background: var(--bg-alt); }
.statement blockquote { max-width: 900px; margin: 0; font: 400 44px/1.5 var(--font-serif); }
.statement p { margin: 28px 0 0; color: var(--muted); font-size: 14px; }
.section { padding-block: 94px; }
.section h2, .contact h2 { margin: 12px 0 42px; font-size: 36px; line-height: 1.35; font-weight: 600; }

.industry-grid { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.industry-card { min-height: 300px; padding: 38px 34px 42px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.industry-card > span { color: var(--muted); font-size: 12px; letter-spacing: .04em; }
.industry-card h3 { margin: 32px 0 14px; font-size: 22px; line-height: 1.45; font-weight: 600; }
.industry-card p, .process-grid p, .evidence-grid p { margin: 0; color: var(--muted); font-size: 15px; line-height: 1.75; }
.text-link { display: inline-flex; align-items: center; gap: 8px; margin-top: 28px; font-size: 15px; font-weight: 600; }
.text-link i { color: var(--red); font-style: normal; transition: transform 160ms var(--ease), color 160ms var(--ease); }
.text-link:hover { text-decoration: underline; text-underline-offset: 3px; }
.text-link:hover i { color: var(--red-hover); transform: translateX(2px); }

.process { background: var(--bg-alt); }
.process-grid { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 2px solid var(--ink); }
.process-grid article { position: relative; padding: 30px 26px 0 0; }
.process-grid article::before { content: ""; position: absolute; left: 0; top: -5px; width: 8px; height: 8px; border: 1px solid var(--ink); background: #fff; }
.process-grid article > span { display: block; margin-bottom: 10px; color: var(--muted); font-size: 12px; font-weight: 600; }
.process-grid h3 { margin: 0 0 8px; font-size: 16px; }
.evidence { border-top: 1px solid var(--line); }
.evidence-grid { display: grid; grid-template-columns: 1.2fr 1fr 1fr; border-top: 1px solid var(--line); }
.evidence-grid article { min-height: 150px; padding: 28px 28px 14px 0; border-bottom: 1px solid var(--line); }
.evidence-grid article + article { padding-left: 28px; border-left: 1px solid var(--line); }
.evidence-grid h3 { margin: 0 0 10px; font-size: 16px; }

.faq { background: var(--bg-alt); }
.faq-layout { display: grid; grid-template-columns: 1fr 2fr; gap: 80px; }
.faq-list { border-top: 1px solid var(--line); }
.faq-list details { border-bottom: 1px solid var(--line); }
.faq-list summary { position: relative; padding: 25px 44px 25px 0; font-size: 17px; font-weight: 600; cursor: pointer; list-style: none; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after { content: "+"; position: absolute; right: 4px; top: 21px; font-size: 24px; font-weight: 400; }
.faq-list details[open] summary::after { content: "−"; }
.faq-list p { margin: -4px 0 24px; color: var(--muted); font-size: 15px; line-height: 1.8; }

.contact { padding-block: 114px; text-align: center; border-top: 1px solid var(--line); }
.contact-inner { max-width: 760px; }
.contact h2 { margin-bottom: 20px; }
.contact > .container > p:not(.eyebrow) { max-width: 580px; margin: 0 auto; color: var(--muted); font-size: 16px; line-height: 1.8; }
.contact-actions { display: flex; justify-content: center; align-items: center; gap: 18px; margin-top: 36px; }

.site-footer { padding-block: 62px; background: var(--ink); color: var(--muted-dark); }
.footer-main { display: flex; justify-content: space-between; gap: 40px; }
.footer-main strong { display: block; margin-bottom: 12px; color: #fff; font-size: 16px; }
.footer-main p, .footer-compliance { margin: 0; font-size: 13px; line-height: 1.9; }
.footer-main nav { display: grid; gap: 10px; color: #fff; font-size: 13px; font-weight: 500; }
.footer-compliance { text-align: right; }
.footer-bottom { display: flex; justify-content: space-between; margin-top: 40px; padding-top: 24px; border-top: 1px solid rgba(255,255,255,.12); color: #8c8c87; font-size: 12px; }
.footer-bottom a:hover { color: #fff; }
.mobile-sticky, .mobile-menu { display: none; }

@media (max-width: 1239px) {
  .container { width: auto; margin-inline: 64px; }
  .site-header .header-inner { flex: 1; }
  .site-header { height: 72px; }
  .desktop-nav { display: none; }
  .menu-button { display: block; }
  .hero { padding-block: 92px 84px; }
  .hero-grid { grid-template-columns: minmax(0, 1.1fr) minmax(320px, .9fr); gap: 42px; }
  h1 { font-size: 44px; line-height: 1.32; }
  .hero-lede { font-size: 16px; line-height: 1.75; }
  .statement { padding-block: 94px; }
  .statement blockquote { font-size: 36px; }
  .section { padding-block: 78px; }
  .section h2, .contact h2 { font-size: 30px; margin-bottom: 36px; }
  .industry-card { padding: 32px 28px 36px; }
  .industry-card h3 { font-size: 20px; }
  .process-grid article { padding-right: 20px; }
  .faq-layout { gap: 54px; }
  .contact { padding-block: 94px; }
  .site-footer { padding-block: 56px; }
  .mobile-menu { position: fixed; inset: 0; z-index: 200; display: flex; flex-direction: column; padding: 20px 64px 40px; background: var(--ink); color: #fff; opacity: 0; visibility: hidden; transform: translateY(-12px); transition: opacity 240ms var(--ease), transform 240ms var(--ease), visibility 240ms; }
  .menu-open .mobile-menu { opacity: 1; visibility: visible; transform: translateY(0); }
  .mobile-menu-head { display: flex; align-items: center; justify-content: space-between; height: 52px; }
  .mobile-brand { font-size: 19px; font-weight: 600; }
  .menu-close { position: relative; width: 44px; height: 44px; border: 0; background: transparent; }
  .menu-close span { position: absolute; left: 11px; top: 21px; width: 22px; height: 2px; background: #fff; transform: rotate(45deg); }
  .menu-close span + span { transform: rotate(-45deg); }
  .mobile-menu nav { display: grid; margin-top: 38px; }
  .mobile-menu nav a { display: flex; align-items: center; min-height: 58px; border-bottom: 1px solid rgba(255,255,255,.12); font-size: 22px; font-weight: 600; }
  .mobile-menu-cta { width: 100%; margin-top: auto; background: #fff; color: var(--ink); }
  .menu-open { overflow: hidden; }
}

@media (max-width: 767px) {
  .container { margin-inline: 20px; }
  .site-header { height: 60px; }
  .brand-cn { display: none; }
  .mobile-menu { padding: 8px 20px 28px; }
  .hero { padding-block: 66px 54px; }
  .hero-grid { grid-template-columns: 1fr; gap: 34px; }
  h1 { margin-block: 20px 16px; font-size: 32px; line-height: 1.35; }
  .hero-lede { font-size: 16px; line-height: 1.7; }
  .hero-actions { flex-direction: column; gap: 12px; margin-top: 28px; }
  .hero-actions .button { width: 100%; }
  .legal-note { margin-top: 20px; }
  .intent-visual { margin-inline: -4px; }
  .intent-visual svg { max-height: 220px; margin-inline: auto; }
  .industry-strip { padding-block: 20px; }
  .industry-strip-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 16px 12px; font-size: 13px; }
  .industry-strip-inner strong { grid-column: 1 / -1; }
  .industry-strip-inner span::before { display: none; }
  .statement { padding-block: 62px; }
  .statement blockquote { font-size: 28px; line-height: 1.55; }
  .statement p { margin-top: 20px; font-size: 13px; }
  .section { padding-block: 62px; }
  .section h2, .contact h2 { margin-bottom: 28px; font-size: 26px; line-height: 1.4; }
  .industry-grid { grid-template-columns: 1fr; border: 0; }
  .industry-card { min-height: 0; padding: 32px 24px 36px; border-right: 0; }
  .industry-card h3 { margin-top: 24px; font-size: 19px; }
  .process-grid { grid-template-columns: 1fr; border-top: 0; }
  .process-grid article { display: grid; grid-template-columns: 40px 1fr; gap: 0 16px; padding: 28px 0; border-bottom: 1px solid var(--line); }
  .process-grid article::before { display: none; }
  .process-grid article > span { grid-column: 1; grid-row: 1 / 3; color: var(--red); font-size: 16px; }
  .process-grid article > div { grid-column: 2; }
  .evidence-grid { grid-template-columns: 1fr; }
  .evidence-grid article, .evidence-grid article + article { min-height: 0; padding: 24px 0 20px; border-left: 0; }
  .faq-layout { grid-template-columns: 1fr; gap: 8px; }
  .faq-list summary { font-size: 16px; }
  .contact { padding-block: 70px; }
  .contact-actions { flex-direction: column; gap: 12px; }
  .contact-actions .button { width: 100%; }
  .site-footer { padding-block: 40px 82px; }
  .footer-main { flex-direction: column; gap: 32px; }
  .footer-compliance { text-align: left; }
  .footer-bottom { flex-direction: column; gap: 8px; margin-top: 32px; padding-top: 20px; }
  .mobile-sticky { position: fixed; left: 0; right: 0; bottom: 0; z-index: 90; display: block; height: 56px; padding: 6px 20px; border-top: 1px solid var(--line); background: #fff; transform: translateY(100%); transition: transform 200ms var(--ease); }
  .mobile-sticky.is-visible { transform: translateY(0); }
  .mobile-sticky .button { width: 100%; height: 44px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 1ms !important; animation-iteration-count: 1 !important; transition-duration: 1ms !important; }
  .visual-path, .visual-node { animation: none; }
  .button:active { transform: none; }
}