:root {
  --ink: #171615;
  --muted: #605c55;
  --paper: #f7f3ed;
  --surface: #fffdfa;
  --line: #ded6ca;
  --green: #275448;
  --green-2: #17372f;
  --brass: #b58a46;
  --clay: #8d483e;
  --shadow: 0 18px 60px rgba(32, 26, 20, 0.14);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--surface);
  color: var(--ink);
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", Arial, sans-serif;
  line-height: 1.65;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font: inherit;
}

img {
  display: block;
  max-width: 100%;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: minmax(220px, 1fr) auto minmax(160px, auto);
  align-items: center;
  gap: 24px;
  width: 100%;
  min-height: 72px;
  padding: 12px clamp(18px, 4vw, 54px);
  color: #fff;
  background: linear-gradient(180deg, rgba(14, 18, 16, 0.78), rgba(14, 18, 16, 0.16));
  transition: background 180ms ease, box-shadow 180ms ease;
}

.site-header.is-scrolled {
  color: var(--ink);
  background: rgba(255, 253, 250, 0.94);
  box-shadow: 0 1px 0 var(--line);
  backdrop-filter: blur(16px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.brand-logo {
  position: relative;
  display: block;
  flex: 0 0 42px;
  width: 42px;
  height: 46px;
}

.brand-logo img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  transition: opacity 180ms ease;
}

.brand-logo .logo-on-light,
.site-header.is-scrolled .brand-logo .logo-on-dark {
  opacity: 0;
}

.site-header.is-scrolled .brand-logo .logo-on-light {
  opacity: 1;
}

.brand strong,
.brand small {
  display: block;
  white-space: nowrap;
}

.brand strong {
  font-size: 16px;
  line-height: 1.1;
}

.brand small {
  margin-top: 3px;
  color: currentColor;
  font-size: 12px;
  opacity: 0.78;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 6px;
}

.main-nav a {
  padding: 8px 13px;
  border-radius: 4px;
  color: currentColor;
  font-size: 14px;
  opacity: 0.86;
}

.main-nav a:hover,
.main-nav a:focus-visible {
  background: rgba(255, 255, 255, 0.14);
  opacity: 1;
  outline: none;
}

.site-header.is-scrolled .main-nav a:hover,
.site-header.is-scrolled .main-nav a:focus-visible {
  background: rgba(39, 84, 72, 0.08);
}

.header-call,
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: 6px;
}

.header-call {
  min-height: 40px;
  padding: 8px 14px;
  border: 1px solid rgba(255, 255, 255, 0.48);
  font-size: 14px;
  justify-self: end;
}

.site-header.is-scrolled .header-call {
  border-color: rgba(39, 84, 72, 0.28);
  color: var(--green);
}

.lucide {
  width: 18px;
  height: 18px;
  stroke-width: 2;
}

.hero {
  position: relative;
  min-height: 92vh;
  overflow: hidden;
  color: #fff;
  display: grid;
  align-items: end;
}

.hero picture,
.hero img,
.hero-overlay {
  position: absolute;
  inset: 0;
}

.hero img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-overlay {
  background:
    linear-gradient(90deg, rgba(13, 19, 16, 0.86) 0%, rgba(13, 19, 16, 0.62) 35%, rgba(13, 19, 16, 0.12) 72%),
    linear-gradient(180deg, rgba(13, 19, 16, 0.4) 0%, rgba(13, 19, 16, 0) 32%, rgba(13, 19, 16, 0.78) 100%);
}

.hero-content {
  position: relative;
  z-index: 2;
  width: min(1120px, calc(100% - 36px));
  margin: 0 auto;
  padding: 130px 0 42px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--brass);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0;
}

.hero h1 {
  max-width: 760px;
  margin: 0;
  font-size: clamp(42px, 7vw, 84px);
  line-height: 1.02;
  letter-spacing: 0;
}

.hero-lede {
  max-width: 680px;
  margin: 22px 0 0;
  color: rgba(255, 255, 255, 0.88);
  font-size: clamp(17px, 2vw, 22px);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.btn {
  min-height: 48px;
  padding: 12px 18px;
  border: 1px solid transparent;
  cursor: pointer;
  font-weight: 800;
}

.btn.primary {
  background: var(--brass);
  color: #17120a;
}

.btn.secondary {
  border-color: rgba(255, 255, 255, 0.48);
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
}

.trust-strip {
  display: grid;
  grid-template-columns: minmax(220px, 0.7fr) minmax(280px, 1.2fr);
  gap: 12px;
  width: min(880px, 100%);
  margin: 48px 0 0;
}

.trust-strip div {
  border-left: 3px solid var(--brass);
  padding: 12px 16px;
  background: rgba(255, 255, 255, 0.11);
  backdrop-filter: blur(12px);
}

.trust-strip dt {
  color: rgba(255, 255, 255, 0.68);
  font-size: 12px;
}

.trust-strip dd {
  margin: 4px 0 0;
  font-weight: 800;
}

section {
  padding: clamp(64px, 9vw, 112px) clamp(18px, 4vw, 54px);
}

.band {
  background: var(--paper);
}

.section-head,
.service-layout,
.case-grid,
.geo-list,
.topic-list,
.contact {
  width: min(1120px, 100%);
  margin-right: auto;
  margin-left: auto;
}

.section-head {
  margin-bottom: 34px;
}

.section-head.inline {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
}

.section-head h2 {
  max-width: 760px;
  margin: 0;
  font-size: clamp(28px, 4vw, 46px);
  line-height: 1.12;
  letter-spacing: 0;
}

.intro-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  width: min(1120px, 100%);
  margin: 0 auto;
}

.intro-grid article,
.case-grid .case-card,
.geo-list article,
.contact-panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: 0 1px 0 rgba(32, 26, 20, 0.04);
}

.intro-grid article {
  padding: 26px;
}

.intro-grid i {
  color: var(--green);
}

.intro-grid h3,
.geo-list h3,
.case-grid h3 {
  margin: 12px 0 8px;
  line-height: 1.25;
}

.intro-grid p,
.geo-list p,
.service-copy p,
.contact-copy p {
  margin: 0;
  color: var(--muted);
}

.service-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(320px, 1fr);
  gap: 36px;
  align-items: start;
}

.service-copy {
  border-left: 4px solid var(--green);
  padding-left: 24px;
}

.check-list {
  display: grid;
  gap: 10px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.check-list li {
  position: relative;
  padding-left: 26px;
}

.check-list li::before {
  position: absolute;
  left: 0;
  top: 0.15em;
  color: var(--brass);
  content: "✓";
  font-weight: 900;
}

.service-matrix {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.service-matrix span {
  display: grid;
  min-height: 86px;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: linear-gradient(135deg, #fffdfa 0%, #f0ece5 100%);
  color: var(--green-2);
  font-size: 18px;
  font-weight: 800;
  text-align: center;
}

.text-link {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 8px;
  color: var(--green);
  font-weight: 800;
}

.case-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.case-grid .case-card {
  display: block;
  min-height: 178px;
  padding: 20px;
}

.case-grid .case-card:hover,
.case-grid .case-card:focus-visible {
  transform: translateY(-2px);
  border-color: rgba(39, 84, 72, 0.42);
  outline: none;
}

.case-grid .case-feature {
  grid-column: span 2;
  background: var(--green);
  color: #fff;
}

.case-grid p {
  margin: 0;
  color: var(--brass);
  font-weight: 800;
}

.case-grid h3 {
  font-size: 20px;
}

.case-grid span {
  color: var(--muted);
  font-size: 14px;
}

.case-grid .case-feature span {
  color: rgba(255, 255, 255, 0.74);
}

.geo-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.geo-list article {
  padding: 24px;
}

.geo-list span {
  display: inline-grid;
  width: 44px;
  height: 34px;
  place-items: center;
  border-radius: 6px;
  background: rgba(141, 72, 62, 0.11);
  color: var(--clay);
  font-weight: 900;
}

.topic-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.topic-list a {
  min-height: 70px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 18px;
  background: var(--surface);
  font-weight: 800;
}

.topic-list a:hover,
.topic-list a:focus-visible {
  border-color: rgba(39, 84, 72, 0.48);
  color: var(--green);
  outline: none;
}

.contact {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(310px, 420px);
  gap: 36px;
  align-items: start;
}

.contact h2 {
  margin: 0 0 18px;
  font-size: clamp(28px, 4vw, 46px);
  line-height: 1.15;
}

.contact a,
.inline-copy {
  color: var(--green);
  font-weight: 900;
}

.inline-copy {
  border: 0;
  padding: 0;
  background: transparent;
  cursor: pointer;
}

.contact-panel {
  display: grid;
  gap: 0;
  overflow: hidden;
}

.contact-panel div {
  display: grid;
  grid-template-columns: 28px 1fr;
  column-gap: 12px;
  padding: 20px;
  border-bottom: 1px solid var(--line);
}

.contact-panel div:last-child {
  border-bottom: 0;
}

.contact-panel i {
  grid-row: span 2;
  color: var(--green);
}

.contact-panel span {
  color: var(--muted);
  font-size: 13px;
}

.contact-panel strong {
  font-size: 18px;
}

.site-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  padding: 24px clamp(18px, 4vw, 54px);
  border-top: 1px solid var(--line);
  background: var(--green-2);
  color: rgba(255, 255, 255, 0.78);
  font-size: 14px;
}

.site-footer p {
  margin: 0;
}

.toast {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 30;
  transform: translateY(16px);
  opacity: 0;
  pointer-events: none;
  border-radius: 6px;
  padding: 12px 14px;
  background: var(--green-2);
  color: #fff;
  box-shadow: var(--shadow);
  transition: transform 180ms ease, opacity 180ms ease;
}

.toast.is-visible {
  transform: translateY(0);
  opacity: 1;
}

.subpage {
  background: var(--surface);
}

.subpage .site-header {
  position: sticky;
}

.page-hero {
  display: grid;
  width: min(1120px, calc(100% - 36px));
  margin: 0 auto;
  padding-top: 72px;
  gap: 30px;
}

.case-page-hero {
  grid-template-columns: minmax(0, 1fr) minmax(320px, 440px);
  align-items: stretch;
}

.article-page-hero {
  display: block;
  max-width: 880px;
}

.page-hero h1 {
  max-width: 860px;
  margin: 0;
  font-size: clamp(34px, 5vw, 58px);
  line-height: 1.08;
  letter-spacing: 0;
}

.page-hero p {
  max-width: 780px;
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 18px;
}

.case-meta {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
  margin: 30px 0 0;
}

.case-meta div {
  border-left: 3px solid var(--brass);
  padding: 10px 12px;
  background: var(--paper);
}

.case-meta dt {
  color: var(--muted);
  font-size: 12px;
}

.case-meta dd {
  margin: 3px 0 0;
  font-weight: 900;
}

.media-placeholder {
  display: grid;
  min-height: 340px;
  place-content: end start;
  border-radius: 8px;
  padding: 26px;
  background:
    linear-gradient(135deg, rgba(23, 55, 47, 0.86), rgba(181, 138, 70, 0.36)),
    url("assets/hero-interior.png") center / cover;
  color: #fff;
  overflow: hidden;
}

.media-placeholder span {
  color: rgba(255, 255, 255, 0.72);
  font-size: 13px;
  font-weight: 800;
}

.media-placeholder strong {
  display: block;
  margin-top: 6px;
  font-size: 30px;
  line-height: 1.15;
}

.content-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 360px);
  gap: 36px;
  width: min(1120px, calc(100% - 36px));
  margin: 0 auto;
}

.content-layout.single {
  display: block;
  max-width: 880px;
}

.prose {
  max-width: 760px;
}

.prose h2 {
  margin: 34px 0 10px;
  font-size: clamp(24px, 3vw, 34px);
  line-height: 1.18;
}

.prose h2:first-of-type {
  margin-top: 0;
}

.prose p {
  margin: 0 0 16px;
  color: var(--muted);
  font-size: 17px;
}

.detail-panel {
  position: sticky;
  top: 96px;
  align-self: start;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 22px;
  background: var(--paper);
}

.detail-panel h2 {
  margin: 0 0 12px;
  font-size: 22px;
}

.detail-panel ul {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.detail-panel li {
  position: relative;
  padding-left: 22px;
}

.detail-panel li::before {
  position: absolute;
  left: 0;
  color: var(--brass);
  content: "✓";
  font-weight: 900;
}

.detail-panel p {
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.page-cta {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 24px;
  width: min(1120px, calc(100% - 36px));
  margin: 0 auto clamp(64px, 9vw, 112px);
  border-radius: 8px;
  padding: clamp(24px, 4vw, 38px);
  background: var(--green-2);
  color: #fff;
}

.page-cta h2 {
  max-width: 760px;
  margin: 0 0 12px;
  font-size: clamp(24px, 3vw, 36px);
  line-height: 1.16;
}

.page-cta p {
  margin: 0;
  color: rgba(255, 255, 255, 0.76);
}

.page-cta a,
.page-cta .inline-copy {
  color: #fff;
}

@media (max-width: 900px) {
  .site-header {
    grid-template-columns: 1fr auto;
    gap: 12px;
  }

  .main-nav {
    display: none;
  }

  .header-call span {
    display: none;
  }

  .trust-strip,
  .service-layout,
  .case-page-hero,
  .content-layout,
  .page-cta,
  .contact {
    grid-template-columns: 1fr;
  }

  .intro-grid,
  .geo-list,
  .topic-list {
    grid-template-columns: 1fr;
  }

  .case-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .case-meta {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .detail-panel {
    position: static;
  }
}

@media (max-width: 620px) {
  .site-header {
    min-height: 64px;
    padding: 10px 14px;
  }

  .brand-logo {
    flex-basis: 38px;
    width: 38px;
    height: 42px;
  }

  .brand strong {
    font-size: 14px;
  }

  .brand small {
    max-width: 180px;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .hero {
    min-height: 94vh;
  }

  .hero-overlay {
    background:
      linear-gradient(180deg, rgba(13, 19, 16, 0.5), rgba(13, 19, 16, 0.72)),
      linear-gradient(90deg, rgba(13, 19, 16, 0.8), rgba(13, 19, 16, 0.24));
  }

  .hero-content {
    width: min(100% - 28px, 1120px);
    padding-bottom: 28px;
  }

  .hero h1 {
    font-size: 44px;
  }

  .hero-actions,
  .btn {
    width: 100%;
  }

  .trust-strip {
    margin-top: 28px;
  }

  section {
    padding: 58px 14px;
  }

  .section-head.inline {
    display: block;
  }

  .text-link {
    margin-top: 14px;
  }

  .case-grid {
    grid-template-columns: 1fr;
  }

  .case-grid .case-feature {
    grid-column: auto;
  }

  .case-meta {
    grid-template-columns: 1fr;
  }

  .service-matrix {
    grid-template-columns: 1fr;
  }

  .site-footer {
    display: block;
  }

  .site-footer p + p {
    margin-top: 8px;
  }
}