:root {
  --ink: #19201f;
  --body: #46514e;
  --muted: #6b7773;
  --red: #c31f2d;
  --red-dark: #981521;
  --red-soft: #f7e8e9;
  --paper: #fbfaf7;
  --mist: #eef1ed;
  --sand: #f3efe6;
  --line: #d8ddd8;
  --white: #fff;
  --max: 1240px;
  --shadow: 0 24px 70px rgba(24, 32, 31, .12);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 16px/1.7 "Segoe UI", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; }
button, input, select, textarea { font: inherit; }
.skip-link {
  position: fixed;
  top: -100px;
  left: 20px;
  z-index: 100;
  background: var(--ink);
  color: white;
  padding: 10px 16px;
}
.skip-link:focus { top: 10px; }
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(251, 250, 247, .94);
  border-bottom: 1px solid rgba(216, 221, 216, .9);
  backdrop-filter: blur(16px);
}
.header-inner {
  max-width: var(--max);
  height: 82px;
  margin: auto;
  padding: 0 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}
.logo-link { display: inline-flex; align-items: center; flex: 0 0 auto; }
.logo-link img { width: 238px; }
.site-nav { display: flex; align-items: center; gap: 26px; }
.site-nav > a,
.nav-dropdown > button {
  border: 0;
  background: transparent;
  padding: 8px 0;
  color: var(--ink);
  text-decoration: none;
  font-size: 14px;
  font-weight: 650;
  cursor: pointer;
}
.site-nav > a:hover,
.site-nav > a:focus-visible,
.nav-dropdown > button:hover { color: var(--red); }
.nav-dropdown { position: relative; }
.nav-dropdown > button { display: flex; align-items: center; gap: 6px; }
.nav-dropdown-panel {
  position: absolute;
  top: calc(100% + 14px);
  left: -22px;
  min-width: 230px;
  background: var(--white);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  padding: 10px;
  display: none;
}
.nav-dropdown-panel a { display: block; padding: 11px 12px; text-decoration: none; font-size: 14px; }
.nav-dropdown-panel a:hover { background: var(--mist); color: var(--red); }
.nav-dropdown:hover .nav-dropdown-panel,
.nav-dropdown:focus-within .nav-dropdown-panel,
.nav-dropdown.is-open .nav-dropdown-panel { display: block; }
.nav-cta { background: var(--red) !important; color: white !important; padding: 10px 17px !important; border-radius: 2px; }
.nav-cta:hover { background: var(--red-dark) !important; }
.language-link { color: var(--muted) !important; }
.nav-toggle { display: none; border: 1px solid var(--line); background: transparent; padding: 9px 13px; }
.hero {
  position: relative;
  max-width: var(--max);
  min-height: calc(100svh - 82px);
  margin: 0 auto;
  padding: 90px 28px 100px;
  display: grid;
  grid-template-columns: minmax(0, 1.12fr) minmax(360px, .88fr);
  gap: 70px;
  align-items: center;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  width: 580px;
  height: 580px;
  top: 2%;
  right: -160px;
  border-radius: 50%;
  background: var(--red-soft);
  z-index: -1;
}
.hero-content { position: relative; z-index: 2; }
.eyebrow {
  margin: 0 0 18px;
  color: var(--red);
  font-size: 11px;
  line-height: 1.4;
  font-weight: 800;
  letter-spacing: .16em;
  text-transform: uppercase;
}
.eyebrow.light { color: #ffc7cc; }
.hero h1, .article-hero h1 {
  margin: 0;
  max-width: 900px;
  font-size: clamp(52px, 7vw, 102px);
  line-height: 1.06;
  letter-spacing: 0;
  overflow-wrap: anywhere;
}
html[lang="zh-CN"] .hero h1,
html[lang="zh-CN"] .article-hero h1 { line-height: 1.18; }
.hero-lead { max-width: 730px; margin: 32px 0 0; color: var(--body); font-size: clamp(19px, 2vw, 24px); line-height: 1.55; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 22px; align-items: center; margin-top: 32px; }
.button {
  display: inline-block;
  border: 0;
  border-radius: 2px;
  background: var(--red);
  color: white;
  padding: 14px 22px;
  font-weight: 750;
  text-decoration: none;
  cursor: pointer;
}
.button:hover, .button:focus-visible { background: var(--red-dark); }
.button-white { background: white; color: var(--red); }
.button-white:hover { background: var(--sand); color: var(--red-dark); }
.text-link { color: var(--ink); text-decoration: none; font-weight: 700; border-bottom: 1px solid var(--ink); padding-bottom: 3px; }
.text-link:hover { color: var(--red); border-color: var(--red); }
.hero-note { margin: 26px 0 0; max-width: 620px; color: var(--muted); font-size: 13px; }
.hero-visual { position: relative; min-height: 480px; align-self: stretch; display: flex; align-items: center; justify-content: center; }
.hero-visual::before, .hero-visual::after {
  content: "";
  position: absolute;
  border: 2px solid var(--red);
  border-radius: 28px;
  width: 270px;
  height: 270px;
  transform: rotate(-8deg);
}
.hero-visual::before { left: 7%; bottom: 15%; }
.hero-visual::after { right: 8%; top: 12%; transform: rotate(9deg); }
.search-window {
  position: relative;
  z-index: 2;
  width: min(100%, 410px);
  min-height: 330px;
  padding: 30px 30px 26px;
  background: white;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  transform: rotate(-2deg);
}
.search-window span { color: var(--red); font-size: 12px; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
.search-window b { display: block; margin: 20px 0 34px; font-size: 26px; line-height: 1.2; letter-spacing: 0; }
.search-window i { display: block; height: 9px; margin: 12px 0; background: var(--mist); }
.search-window i:nth-of-type(2) { width: 84%; }
.search-window i:nth-of-type(3) { width: 62%; }
.signal { position: absolute; z-index: 3; background: var(--ink); color: white; font-size: 10px; font-weight: 800; letter-spacing: .14em; padding: 10px 13px; }
.signal-a { top: 18%; left: 3%; }
.signal-b { right: 0; top: 52%; background: var(--red); }
.signal-c { bottom: 16%; left: 14%; }
.audience-grid {
  max-width: var(--max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.audience-grid article { padding: 38px 36px; }
.audience-grid article + article { border-left: 1px solid var(--line); }
.audience-grid span, .card-kicker, .case-meta {
  color: var(--muted);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: .14em;
  text-transform: uppercase;
}
.audience-grid h2 { margin: 12px 0 20px; font-size: 24px; line-height: 1.25; letter-spacing: 0; }
.arrow-link { color: var(--ink); text-decoration: none; font-size: 14px; font-weight: 750; }
.arrow-link:hover { color: var(--red); }
.section { padding: 110px max(28px, calc((100vw - var(--max)) / 2 + 28px)); }
.section-heading { max-width: 840px; margin-bottom: 52px; }
.section-heading.narrow { max-width: 620px; }
.section-heading h2, .split-section h2, .contact-band h2, .contact-details h2 {
  margin: 0;
  font-size: clamp(36px, 5vw, 64px);
  line-height: 1.06;
  letter-spacing: 0;
}
html[lang="zh-CN"] .section-heading h2,
html[lang="zh-CN"] .split-section h2,
html[lang="zh-CN"] .contact-band h2,
html[lang="zh-CN"] .contact-details h2 { line-height: 1.16; }
.section-heading > p:last-child:not(.eyebrow) { color: var(--body); font-size: 18px; max-width: 700px; }
.problem-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.problem-grid article, .why-grid article, .scope-grid article, .case-list article {
  padding: 32px;
  border: 1px solid var(--line);
  background: white;
}
.problem-grid span, .why-grid span, .scope-grid span, .case-list span {
  color: var(--red);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: .12em;
}
.problem-grid h3, .why-grid h3, .scope-grid h3, .case-list h3 { margin: 16px 0 10px; font-size: 22px; line-height: 1.25; letter-spacing: 0; }
.problem-grid p, .why-grid p, .scope-grid p, .case-list p { margin: 0; color: var(--body); font-size: 15px; }
.services-section { background: var(--mist); }
.service-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; align-items: stretch; }
.service-card {
  min-height: 500px;
  padding: 34px;
  background: var(--paper);
  border-top: 4px solid var(--red);
  display: flex;
  flex-direction: column;
}
.card-number { color: var(--red); font-size: 42px; line-height: 1; font-weight: 300; }
.service-card h3 { margin: 10px 0 14px; font-size: 26px; line-height: 1.16; letter-spacing: 0; }
.service-card > p:not(.card-kicker) { color: var(--body); }
.checklist { list-style: none; padding: 0; margin: 8px 0 28px; }
.checklist li { position: relative; padding: 8px 0 8px 22px; border-bottom: 1px solid var(--line); font-size: 14px; }
.checklist li::before { content: ""; position: absolute; left: 0; top: 17px; width: 8px; height: 8px; background: var(--red); }
.service-card .arrow-link { margin-top: auto; }
.why-section { background: var(--sand); }
.why-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.why-grid article { background: transparent; padding: 28px 0 0; border: 0; border-top: 1px solid #cfd2ca; }
.process-list { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(5, 1fr); gap: 18px; }
.process-list li { border-top: 3px solid var(--red); padding-top: 20px; }
.process-list span { color: var(--red); font-size: 12px; font-weight: 800; }
.process-list h3 { margin: 14px 0 8px; font-size: 19px; line-height: 1.25; }
.process-list p { color: var(--body); font-size: 14px; margin: 0; }
.fine-print { color: var(--muted); font-size: 12px; line-height: 1.65; }
.process-section > .fine-print { max-width: 900px; margin-top: 32px; }
.evidence-section { background: var(--mist); }
.featured-case { display: grid; grid-template-columns: .72fr 1.28fr; gap: 70px; padding: 36px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.featured-case h3 { margin: 10px 0 24px; font-size: 34px; letter-spacing: 0; }
.featured-case p { color: var(--body); }
.experience-tags { display: flex; flex-wrap: wrap; gap: 10px; margin: 26px 0; }
.experience-tags span { border: 1px solid var(--line); padding: 8px 13px; font-size: 13px; border-radius: 99px; }
.guide-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.guide-card { min-height: 260px; padding: 30px; border: 1px solid var(--line); background: white; display: flex; flex-direction: column; }
.guide-card > p { margin: 0 0 18px; color: var(--red); font-size: 10px; font-weight: 800; letter-spacing: .15em; }
.guide-card h3 { margin: 0 0 14px; font-size: 24px; line-height: 1.25; letter-spacing: 0; }
.guide-card h3 a { text-decoration: none; }
.guide-card h3 a:hover { color: var(--red); }
.guide-card > span { color: var(--body); font-size: 14px; }
.guide-card .arrow-link { margin-top: auto; padding-top: 24px; }
.faq-list { max-width: 920px; }
.faq-list details { border-top: 1px solid var(--line); }
.faq-list details:last-child { border-bottom: 1px solid var(--line); }
.faq-list summary { list-style: none; display: flex; gap: 20px; align-items: center; justify-content: space-between; cursor: pointer; padding: 24px 0; font-size: 18px; font-weight: 750; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary span { color: var(--red); font-size: 24px; font-weight: 400; }
.faq-list details[open] summary span { transform: rotate(45deg); }
.faq-list details > div p { max-width: 800px; margin: 0 0 24px; color: var(--body); }
.contact-band { padding: 90px max(28px, calc((100vw - var(--max)) / 2 + 28px)); display: grid; grid-template-columns: 1.35fr .65fr; gap: 70px; background: var(--red); color: white; }
.contact-band h2 { max-width: 760px; }
.contact-band p:not(.eyebrow) { max-width: 650px; color: #ffe8e9; }
.contact-actions { display: flex; flex-direction: column; align-items: flex-start; justify-content: center; gap: 14px; }
.contact-actions a:not(.button), .contact-actions span { color: white; text-decoration: none; }
.light-link { color: white !important; border-color: white; }
.site-footer { background: #17201d; color: white; padding: 74px max(28px, calc((100vw - var(--max)) / 2 + 28px)) 26px; }
.footer-main { display: grid; grid-template-columns: 2fr repeat(3, 1fr); gap: 48px; }
.footer-brand img { width: 235px; filter: brightness(0) invert(1); }
.footer-brand p { max-width: 360px; color: #b8c2bd; font-size: 14px; }
.footer-contact a { color: #d9e1dd; }
.footer-main h2 { margin: 0 0 14px; color: #f1f4f2; font-size: 12px; text-transform: uppercase; letter-spacing: .12em; }
.footer-main > div > a { display: block; margin: 8px 0; color: #b8c2bd; text-decoration: none; font-size: 14px; }
.footer-main > div > a:hover { color: white; }
.footer-bottom { margin-top: 52px; padding-top: 20px; border-top: 1px solid #35413d; display: flex; justify-content: space-between; gap: 30px; color: #91a09a; font-size: 11px; }
.split-section { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: start; }
.prose { color: var(--body); font-size: 18px; }
.prose p:first-child { margin-top: 0; }
.scope-section, .experience-section, .method-section { background: var(--mist); }
.scope-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.scope-grid article { border: 0; }
.method-section .prose { max-width: 720px; }
.wide-copy { max-width: 900px; color: var(--body); font-size: 18px; }
.boundary-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.boundary-grid article { padding: 32px; background: white; border: 1px solid var(--line); }
.boundary-grid h3 { margin: 0 0 18px; font-size: 22px; }
.boundary-grid .checklist { margin-bottom: 0; }
.article-hero { padding: 110px max(28px, calc((100vw - var(--max)) / 2 + 28px)) 82px; background: var(--red-soft); }
.article-hero.compact { min-height: 430px; display: flex; flex-direction: column; justify-content: flex-end; }
.article-hero h1 { max-width: 1000px; font-size: clamp(46px, 6.5vw, 84px); }
.article-intro { max-width: 760px; margin: 28px 0 0; color: var(--body); font-size: 20px; line-height: 1.6; }
.article-meta { display: flex; flex-wrap: wrap; gap: 12px 24px; margin-top: 24px; color: var(--muted); font-size: 12px; font-weight: 650; }
.breadcrumbs { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 46px; color: var(--red); font-size: 12px; font-weight: 750; }
.breadcrumbs a { text-decoration: none; }
.article-layout { max-width: var(--max); margin: 0 auto; padding: 80px 28px 110px; display: grid; grid-template-columns: 250px minmax(0, 760px); gap: 80px; align-items: start; }
.article-aside { position: sticky; top: 112px; }
.article-aside ol { padding-left: 18px; color: var(--body); font-size: 13px; }
.article-aside li { margin: 8px 0; }
.article-aside a { text-decoration: none; }
.article-aside a.is-active { color: var(--red); font-weight: 750; }
.aside-cta { margin-top: 28px; padding-top: 20px; border-top: 1px solid var(--line); }
.aside-cta a { color: var(--red); font-weight: 750; text-decoration: none; }
.article-body { font-size: 18px; color: #303a37; }
.article-body h2 { margin: 70px 0 20px; color: var(--ink); font-size: 36px; line-height: 1.15; letter-spacing: 0; }
section[id], h2[id], h3[id] { scroll-margin-top: 112px; }
.article-body h2:first-child { margin-top: 0; }
.article-body h3 { margin: 42px 0 10px; color: var(--ink); font-size: 23px; line-height: 1.3; }
.article-body a { color: var(--red); font-weight: 650; }
.article-body .checklist { margin: 22px 0; }
.article-body .checklist li { font-size: 16px; }
.callout { margin: 34px 0; padding: 25px 28px; border-left: 4px solid var(--red); background: var(--sand); }
.callout strong { display: block; margin-bottom: 6px; color: var(--ink); }
.callout span { display: block; color: var(--body); }
.source-list { margin-top: 44px; padding-top: 6px; border-top: 1px solid var(--line); }
.source-list h2 { margin-top: 28px; }
.source-list ul { padding-left: 20px; }
.source-list li { margin: 8px 0; }
.guide-grid-wide { grid-template-columns: repeat(2, 1fr); }
.case-card-feature { display: grid; grid-template-columns: 100px 1fr; gap: 34px; padding: 34px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.case-index { color: var(--red); font-size: 44px; font-weight: 300; }
.case-card-feature h2 { margin: 8px 0 14px; font-size: 34px; line-height: 1.2; letter-spacing: 0; }
.case-card-feature p { max-width: 720px; color: var(--body); }
.case-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.case-page-layout { max-width: var(--max); margin: 0 auto; padding: 80px 28px 110px; display: grid; grid-template-columns: 260px minmax(0, 720px); gap: 80px; align-items: start; }
.case-page-layout aside { border-top: 3px solid var(--red); }
.case-page-layout dt { margin-top: 22px; color: var(--red); font-size: 11px; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; }
.case-page-layout dd { margin: 3px 0 16px; color: var(--body); font-size: 14px; }
.result-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin: 28px 0; }
.result-grid article { min-height: 150px; padding: 22px; background: var(--mist); }
.result-grid strong { display: block; color: var(--red); font-size: 22px; line-height: 1.2; }
.result-grid span { display: block; margin-top: 10px; color: var(--body); font-size: 13px; }
.contact-page-grid { display: grid; grid-template-columns: .8fr 1.2fr; gap: 80px; }
.contact-details { border-top: 3px solid var(--red); }
.contact-major { display: block; margin: 18px 0; font-size: clamp(22px, 3vw, 34px); color: var(--ink); text-decoration: none; font-weight: 750; letter-spacing: 0; }
.contact-major:hover { color: var(--red); }
.copy-email { margin: -8px 0 24px; padding: 0; border: 0; background: transparent; color: var(--red); font-size: 13px; font-weight: 750; text-decoration: underline; cursor: pointer; }
.contact-form { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; padding: 36px; background: var(--mist); }
.contact-form > div { display: flex; flex-direction: column; }
.contact-form label { margin-bottom: 7px; font-size: 13px; font-weight: 750; }
.contact-form input, .contact-form select, .contact-form textarea { width: 100%; border: 1px solid #c8ceca; background: white; padding: 12px 13px; color: var(--ink); }
.contact-form input:focus, .contact-form select:focus, .contact-form textarea:focus { outline: 2px solid var(--red); outline-offset: 1px; }
.form-wide { grid-column: 1 / -1; }
.contact-form .button { align-self: flex-start; }
.legal-copy { max-width: 800px; margin: 0 auto; }

@media (max-width: 980px) {
  .header-inner { height: 74px; }
  .logo-link img { width: 205px; }
  .nav-toggle { display: block; }
  .site-nav {
    display: none;
    position: absolute;
    top: 74px;
    left: 0;
    right: 0;
    padding: 20px 28px 28px;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
  }
  .site-nav.is-open { display: flex; }
  .site-nav > a, .nav-dropdown > button { display: flex; width: 100%; justify-content: space-between; padding: 12px 0; }
  .nav-dropdown-panel { position: static; display: block; margin: 0 0 8px 12px; padding: 0 0 0 12px; border: 0; box-shadow: none; border-left: 2px solid var(--line); }
  .nav-cta { justify-content: center !important; margin-top: 8px; }
  .hero { grid-template-columns: 1fr; min-height: auto; padding-top: 72px; }
  .hero-visual { min-height: 400px; }
  .audience-grid, .service-grid, .problem-grid, .why-grid, .case-list { grid-template-columns: 1fr; }
  .audience-grid article + article { border-left: 0; border-top: 1px solid var(--line); }
  .service-card { min-height: auto; }
  .process-list { grid-template-columns: repeat(2, 1fr); }
  .featured-case, .split-section, .contact-band, .contact-page-grid { grid-template-columns: 1fr; gap: 38px; }
  .footer-main { grid-template-columns: 1.5fr 1fr 1fr; }
  .footer-main > div:last-child { grid-column: 1 / -1; }
  .article-layout, .case-page-layout { grid-template-columns: 1fr; gap: 44px; }
  .article-aside { display: none; }
}

@media (max-width: 640px) {
  .header-inner, .section, .article-hero, .article-layout, .case-page-layout, .contact-band, .site-footer { padding-left: 20px; padding-right: 20px; }
  .logo-link img { width: 180px; }
  .nav-toggle { padding: 7px 10px; font-size: 13px; }
  .hero { padding: 58px 20px 70px; gap: 30px; }
  .hero h1, .article-hero h1 { font-size: clamp(44px, 14vw, 66px); }
  html[lang="zh-CN"] .hero h1,
  html[lang="zh-CN"] .article-hero h1 { line-height: 1.16; }
  .hero-lead { font-size: 18px; }
  .hero-visual { min-height: 310px; transform: scale(.88); margin: -10px -24px; }
  .signal-a { left: 0; }
  .audience-grid { padding: 0 20px; }
  .audience-grid article { padding: 30px 0; }
  .section { padding-top: 76px; padding-bottom: 76px; }
  .section-heading { margin-bottom: 36px; }
  .section-heading h2, .split-section h2, .contact-band h2, .contact-details h2 { font-size: 38px; }
  .problem-grid, .why-grid, .scope-grid, .guide-grid, .guide-grid-wide, .boundary-grid, .case-list, .result-grid { grid-template-columns: 1fr; }
  .process-list { grid-template-columns: 1fr; }
  .featured-case { gap: 16px; }
  .article-hero { padding-top: 70px; padding-bottom: 58px; }
  .article-hero.compact { min-height: 380px; }
  .article-intro { font-size: 18px; }
  .article-layout, .case-page-layout { padding-top: 58px; padding-bottom: 76px; }
  .article-body { font-size: 17px; }
  .article-body h2 { font-size: 30px; margin-top: 56px; }
  .contact-form { grid-template-columns: 1fr; padding: 24px; }
  .form-wide { grid-column: auto; }
  .footer-main { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
  .footer-main > div:last-child { grid-column: auto; }
  .footer-bottom { flex-direction: column; gap: 10px; }
  .case-card-feature { grid-template-columns: 1fr; gap: 8px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
}