:root {
  --orange: #e76528;
  --green: #143c32;
  --cream: #f5f0e7;
  --paper: #fbf9f5;
  --ink: #282623;
  --muted: #6f6961;
  --line: #d7d0c4;
  --body-size:15px;
  --support-size:13px;
  --note-size:12px;
  --body-leading:1.8;
  --mono: "DM Mono", "SFMono-Regular", Consolas, monospace;
  --sans: "Noto Sans SC", "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scrollbar-color: #8b9d95 var(--cream); scrollbar-width: thin; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: var(--sans); font-size: var(--body-size); line-height: var(--body-leading); }
a { color: inherit; text-decoration: none; }
a:focus-visible, button:focus-visible, summary:focus-visible { outline: 3px solid var(--orange); outline-offset: 4px; }
*::-webkit-scrollbar { width: 10px; height: 10px; }
*::-webkit-scrollbar-track { background: var(--cream); }
*::-webkit-scrollbar-thumb { background: #8b9d95; border: 2px solid var(--cream); }

.site-header { position: fixed; top: 0; z-index: 20; display: flex; align-items: center; justify-content: space-between; width: 100%; height: 72px; padding: 0 max(28px, calc((100% - 1200px) / 2)); color: #fff; background: rgba(20,60,50,.94); backdrop-filter: blur(12px); }
.brand { display: inline-flex; align-items: center; }
.brand img, .footer-brand img { display: block; width: 208px; height: auto; }
.menu-toggle { display: none; border: 0; color: #fff; background: none; font: inherit; }
nav { display: flex; align-items: center; gap: 32px; font-size: var(--support-size); }
nav a { opacity: .88; }
nav a:hover, nav a.active { opacity: 1; color: #f3a071; }
.nav-cta { padding: 9px 16px; border: 1px solid rgba(255,255,255,.65); }

.hero { display: grid; grid-template-columns: 5fr 7fr; min-height: 760px; padding-top: 72px; overflow: hidden; color: #fff; background: var(--green); }
.hero-copy { z-index: 2; width: min(510px, calc(100% - 56px)); margin: 108px 0 76px max(28px, calc((100vw - 1200px) / 2)); }
.eyebrow, .section-index, .case-tag { color: var(--orange); font: 600 var(--note-size) var(--mono); letter-spacing: .08em; }
h1 { margin: 24px 0 26px; font-size: clamp(42px,4.2vw,58px); font-weight: 700; line-height: 1.13; letter-spacing: -.045em; }
h1 em, h2 em { color: var(--orange); font-style: normal; }
.hero-lede { margin: 0 0 12px; font-size: 21px; font-weight: 500; }
.hero-text { max-width: 430px; margin: 0; color: #d4ded7; }
.hero-text strong { color: #fff; font-weight: 500; }
.hero-support { max-width: 430px; margin: 16px 0 0; color: #afc2b7; font-size: var(--support-size); }
.actions { display: flex; align-items: center; gap: 28px; margin-top: 34px; }
.button { display: inline-flex; align-items: center; gap: 28px; padding: 14px 19px; font-size: var(--support-size); font-weight: 700; }
.button-orange { color: #fff; background: var(--orange); box-shadow: 0 8px 22px rgba(231,101,40,.2); }
.text-link { padding-bottom: 4px; border-bottom: 1px solid currentColor; font-size: var(--support-size); }
.text-link span { margin-left: 10px; }
.hero-visual { position: relative; min-height: 688px; overflow: hidden; background: #5e6d66; }
.hero-visual img { display: block; width: 100%; height: 100%; min-height: 688px; object-fit: cover; object-position: 54% center; filter: saturate(.72) contrast(1.03); }
.hero-visual::after { content: ""; position: absolute; inset: 0; background: linear-gradient(100deg,rgba(20,60,50,.44),rgba(20,60,50,.05) 52%,rgba(15,35,30,.12)); }
.hero-place { position: absolute; right: 28px; bottom: 24px; z-index: 1; color: rgba(255,255,255,.78); font: 600 11px var(--mono); letter-spacing: .12em; }

.section { padding: 112px max(28px, calc((100% - 1200px) / 2)); scroll-margin-top: 72px; }
.section-heading { display: flex; justify-content: space-between; align-items: flex-start; gap: 40px; margin-bottom: 60px; }
.section-heading h2, .section-intro h2, .tools h2, .contact h2 { margin: 0; font-size: clamp(30px,4vw,54px); font-weight: 700; line-height: 1.22; letter-spacing: -.045em; }
.problems { background: var(--paper); }
.problem-list { display: grid; grid-template-columns: repeat(4,1fr); border-top: 1px solid var(--line); }
.problem-list > div { min-height: 180px; padding: 26px 22px 0 0; border-right: 1px solid var(--line); }
.problem-list > div:not(:first-child) { padding-left: 22px; }
.problem-list > div:last-child { border-right: 0; }
.problem-list b, .why-grid b { color: var(--orange); font: 600 var(--note-size) var(--mono); }
h3 { margin: 16px 0 10px; font-size: 21px; line-height: 1.4; }
.problem-list p, .why-grid p, .service-list p, .case-grid p, .about p, .tool-panel p, .qa-list p { margin: 0; color: var(--muted); font-size: var(--body-size); line-height: var(--body-leading); }
.section-bottom { margin: 52px 0 0; padding-top: 20px; border-top: 1px solid var(--line); color: var(--muted); }

.method { padding-top: 104px; padding-bottom: 104px; color: #fff; background: var(--green); }
.method-top { display: flex; justify-content: space-between; }
.method-top p { margin: 0; color: #c3d1c9; font-size: var(--support-size); }
.method-title { display: flex; align-items: center; justify-content: center; gap: clamp(12px,3vw,46px); margin: 84px 0; font-size: clamp(42px,8vw,102px); letter-spacing: -.075em; }
.method-title i { color: var(--orange); font-size: .5em; font-style: normal; }
.method-rail { display: grid; grid-template-columns: repeat(4,1fr); border-top: 1px solid #567065; }
.method-rail > div { padding: 20px 18px 0 0; border-right: 1px solid #567065; }
.method-rail > div:not(:first-child) { padding-left: 18px; }
.method-rail > div:last-child { border-right: 0; }
.method-rail b { font-size: var(--body-size); font-weight: 500; }
.method-rail p { margin: 10px 0 0; color: #b6c8bf; font-size: var(--support-size); line-height: 1.75; }
.method-belief { display: grid; grid-template-columns: 120px 1fr; grid-template-areas: "label statement" "label flow"; column-gap: 28px; row-gap: 12px; margin-top: 54px; padding-top: 22px; border-top: 1px solid #567065; }
.method-belief span { grid-area: label; padding-top: 4px; color: var(--orange); font-size: 16px; font-weight: 600; }
.method-belief strong { grid-area: statement; font-size: 19px; font-weight: 500; line-height: 1.55; }
.method-belief p { grid-area: flow; margin: 0; color: #f0a16c; font: 500 16px/1.5 var(--mono); letter-spacing: .04em; }
.method-belief span, .method-belief strong, .method-belief p { white-space: nowrap; }

.services, .about, .qa { background: var(--cream); }
.service-list { border-top: 1px solid var(--line); }
.service-list article { display: grid; grid-template-columns: 72px 1fr; gap: 20px; padding: 30px 0; border-bottom: 1px solid var(--line); }
.service-list article > span { padding-top: 4px; color: var(--orange); font: 600 var(--note-size) var(--mono); }
.service-list h3 { margin: 0 0 8px; font-size: 22px; }
.service-list strong { display: block; margin-bottom: 7px; font-size: 16px; font-weight: 600; }
.service-list p { max-width: 760px; }
.service-list a { display: inline-block; margin-top: 12px; color: var(--green); font-size: var(--support-size); font-weight: 700; }

.why-grid { display: grid; grid-template-columns: repeat(4,1fr); border-top: 1px solid var(--line); }
.why-grid > div { min-height: 178px; padding: 26px 22px 0 0; border-right: 1px solid var(--line); }
.why-grid > div:not(:first-child) { padding-left: 22px; }
.why-grid > div:last-child { border-right: 0; }
.why-grid h3 { margin: 20px 0 8px; }

.metrics { display: grid; grid-template-columns: 3fr 9fr; padding-top: 88px; padding-bottom: 88px; background: var(--cream); }
.section-intro h2 { margin-top: 24px; font-size: 30px; }
.metric-grid { display: grid; grid-template-columns: repeat(4,1fr); align-items: start; }
.metric-grid > div { padding-left: 24px; border-left: 1px solid var(--line); }
.metric-grid strong { display: block; color: var(--green); font-size: 38px; letter-spacing: -.05em; }
.metric-grid sup { font-size: 14px; letter-spacing: 0; }
.metric-grid span { color: var(--muted); font-size: var(--support-size); }
.metric-grid p { margin-top: 10px; color: #817a72; font-size: var(--support-size); line-height: 1.7; }
.data-note { grid-column: 2; margin: 20px 0 0 24px; color: #817a72; font-size: var(--note-size); line-height: 1.7; }

.cases { color: #fff; background: var(--green); }
.case-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 26px; }
.case-grid article { padding-top: 22px; border-top: 1px solid #567065; }
.case-grid h3 { margin: 20px 0 16px; font-size: 25px; }
.case-grid p { margin: 10px 0; color: #c3d1c9; font-size: var(--support-size); line-height: 1.75; }
.case-grid p b { color: #fff; }

.about { display: grid; grid-template-columns: 3fr 9fr; gap: 9%; }
.about h2 { max-width: 570px; margin: 0 0 30px; font-size: 34px; line-height: 1.35; }
.about p { max-width: 730px; margin: 0 0 14px; }
.about strong { display: block; margin-top: 18px; }
.seal { width: 72px; height: 72px; margin-top: 72px; padding-top: 7px; border: 1px solid var(--orange); border-radius: 50%; color: var(--orange); font: 40px/42px Georgia, serif; text-align: center; }
.seal small { display: block; font: 10px/10px var(--sans); }

.tools { display: grid; grid-template-columns: 4fr 8fr; gap: 8%; align-items: start; color: #fff; background: var(--green); }
.tools h2 { margin-top: 24px; }
.tools > div > p { max-width: 420px; color: #c3d1c9; }
.tool-panel { border-top: 1px solid #597268; }
.tool-item-link { display: block; padding: 26px 0; border-bottom: 1px solid #597268; transition: color .2s ease, padding-left .2s ease; }
.tool-item-link:hover { padding-left: 8px; }
.tool-item-link > span { color: #f0a16c; font-size: 21px; font-weight: 700; line-height: 1.55; }
.tool-item-link h3 { margin: 10px 0 4px; font-size: 24px; }
.tool-item-link p { color: #c3d1c9; font-size: var(--support-size); }

.qa-list { width: min(760px,100%); margin-left: auto; }
.qa-list details { padding: 20px 0; border-top: 1px solid var(--line); }
.qa-list details:nth-last-of-type(1) { border-bottom: 1px solid var(--line); }
summary { display: flex; justify-content: space-between; gap: 24px; list-style: none; cursor: pointer; font-size: var(--body-size); font-weight: 600; }
summary::-webkit-details-marker { display: none; }
.qa-list summary span { color: var(--orange); font-size: 22px; font-weight: 400; }
.qa-list p { padding: 14px 34px 0 0; }
.qa-more { display: inline-block; margin-top: 24px; color: var(--green); font-size: var(--support-size); font-weight: 700; }

.contact { display: flex; align-items: end; justify-content: space-between; color: #fff; background: var(--orange); }
.contact .section-index { color: #682d14; }
.contact h2 { margin-top: 24px; }
.contact p { max-width: 720px; }
.contact .button { background: var(--green); }

footer { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 30px; padding: 62px max(28px,calc((100% - 1200px)/2)); color: #c3d1c9; background: var(--green); font-size: var(--support-size); }
footer .footer-brand img { width: 190px; }
.footer-brand p { margin: 14px 0 0; }
.footer-brand + div p:last-child { white-space: nowrap; }
footer > div:last-child { text-align: right; }
footer a { color: #fff; }

@media(max-width:800px) {
  .site-header { height: 64px; }
  .brand img { width: 164px; }
  .menu-toggle { position: relative; z-index: 2; display: block; }
  .site-header nav { display: none; position: absolute; inset: 0; height: 100vh; padding: 78px 28px 34px; background: var(--green); flex-direction: column; justify-content: center; font-size: 18px; }
  .site-header nav.open { display: flex; }
  .hero { display: flex; flex-direction: column; min-height: 0; padding-top: 64px; }
  .hero-copy { order: 1; width: auto; margin: 0; padding: 76px 28px 52px; }
  .hero h1 { font-size: 43px; }
  .hero-visual { position: relative; order: 2; min-height: 290px; height: 48vh; max-height: 390px; }
  .hero-visual img { min-height: 290px; object-position: 54% center; }
  .hero-place { right: 20px; bottom: 16px; }
  .actions { flex-wrap: wrap; }
  .section { padding: 76px 28px; scroll-margin-top: 64px; }
  .section-heading { display: block; margin-bottom: 40px; }
  .section-heading h2 { margin-top: 20px; }
  .problem-list { grid-template-columns: 1fr; }
  .problem-list > div, .problem-list > div:not(:first-child) { display: grid; grid-template-columns: 42px 1fr; min-height: 0; padding: 20px 0; border-top: 1px solid var(--line); border-right: 0; }
  .problem-list > div:first-child { border-top: 0; }
  .problem-list h3 { margin: 0; }
  .problem-list p { grid-column: 2; }
  .section-bottom { margin-top: 36px; }
  .method-top { display: block; }
  .method-top p { margin-top: 18px; }
  .method-title { justify-content: flex-start; gap: 11px; margin: 58px 0 52px; font-size: 38px; }
  .method-rail { grid-template-columns: repeat(2,1fr); }
  .method-rail > div { min-height: 145px; padding: 18px 14px 0 0; }
  .method-rail > div:nth-child(even) { padding-left: 14px; border-right: 0; }
  .method-rail > div:nth-child(n+3) { padding-top: 18px; border-top: 1px solid #567065; }
  .method-belief { display: block; margin-top: 44px; }
  .method-belief span, .method-belief strong, .method-belief p { white-space: normal; }
  .method-belief strong { display: block; margin-top: 14px; font-size: 18px; }
  .method-belief p { margin-top: 14px; font-size: 14px; }
  .service-list article { grid-template-columns: 42px 1fr; gap: 12px; padding: 26px 0; }
  .service-list strong { font-size: 15px; }
  .service-list p { font-size: var(--support-size); }
  .why-grid{grid-template-columns:1fr}
  .why-grid > div, .why-grid > div:not(:first-child) { min-height: 0; padding: 22px 0; border-top: 1px solid var(--line); border-right: 0; }
  .why-grid > div:first-child { border-top: 0; }
  .why-grid h3 { margin: 8px 0 5px; }
  .metrics { display: block; }
  .metric-grid { grid-template-columns: repeat(2,1fr); gap: 28px 0; margin-top: 46px; }
  .metric-grid > div { padding-left: 14px; }
  .metric-grid strong { font-size: 30px; }
  .metric-grid p { display: none; }
  .data-note { margin: 20px 0 0 14px; }
  .case-grid { grid-template-columns: 1fr; }
  .case-grid article:nth-child(n+3){display:none}
  .about { display: block; }
  .about h2 { margin-top: 26px; font-size: 29px; }
  .seal { margin-top: 38px; }
  .tools { display: block; }
  .tool-panel { margin-top: 40px; }
  .tool-item-link > span { font-size: 18px; }
  .tool-item-link h3 { font-size: 21px; }
  .contact { display: block; }
  .contact .button { margin-top: 34px; }
  footer { display: block; padding: 48px 28px; }
  footer > div { margin-top: 30px; }
  footer > div:first-child { margin-top: 0; }
  footer > div:last-child { text-align: left; }
  .footer-brand + div p:last-child { white-space: normal; }
}

@media(prefers-reduced-motion:reduce) { html { scroll-behavior: auto; } .tool-item-link { transition: none; } }
@media(forced-colors:active) { html { scrollbar-color: auto; } }