:root {
  --bg: #f4f7f7;
  --ink: #152027;
  --muted: #64737b;
  --panel: #ffffff;
  --line: #d9e2e3;
  --teal: #14746f;
  --teal-dark: #0e4f4d;
  --blue: #275d86;
  --amber: #9a5d12;
  --steel: #7b8b95;
  --shadow: 0 18px 50px rgba(21, 32, 39, 0.11);
  font-family:
    Inter, "Segoe UI", "Helvetica Neue", Arial, "PingFang SC",
    "Microsoft YaHei", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-padding-top: 106px;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  background: var(--bg);
  color: var(--ink);
}

body.nav-open {
  overflow: hidden;
}

body,
button,
input,
textarea {
  font: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

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

:where(a, button, input, textarea, [tabindex]):focus-visible {
  outline: 3px solid rgba(154, 93, 18, 0.9);
  outline-offset: 3px;
}

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

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.hp-field {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: minmax(210px, 1fr) auto minmax(210px, 1fr);
  align-items: center;
  gap: 20px;
  width: 100%;
  padding: 18px clamp(18px, 4vw, 64px);
  color: #fff;
  transition:
    background 180ms ease,
    color 180ms ease,
    box-shadow 180ms ease,
    padding 180ms ease;
}

.site-header.is-scrolled {
  padding-top: 12px;
  padding-bottom: 12px;
  background: rgba(248, 251, 251, 0.94);
  color: var(--ink);
  box-shadow: 0 10px 30px rgba(21, 32, 39, 0.08);
  backdrop-filter: blur(16px);
}

.brand,
.brand-copy,
.nav-links,
.header-actions,
.hero-actions,
.proof-strip,
.intro-band,
.trust-strip,
.section-heading,
.solution-tabs,
.site-footer,
.site-footer div {
  display: flex;
}

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

.brand-mark {
  display: inline-grid;
  width: 42px;
  height: 42px;
  place-items: center;
  border: 1px solid rgba(255, 255, 255, 0.36);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.14);
  color: #fff;
  font-size: 13px;
  font-weight: 800;
}

.site-header.is-scrolled .brand-mark {
  border-color: rgba(20, 116, 111, 0.24);
  background: #e8f3f1;
  color: var(--teal-dark);
}

.brand-copy {
  min-width: 0;
  flex-direction: column;
  line-height: 1.1;
}

.brand-copy strong,
.brand-copy small {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.brand-copy strong {
  font-size: 15px;
}

.brand-copy small {
  margin-top: 4px;
  color: rgba(255, 255, 255, 0.72);
  font-size: 12px;
}

.site-header.is-scrolled .brand-copy small {
  color: var(--muted);
}

.nav-links {
  align-items: center;
  justify-content: center;
  gap: clamp(14px, 3vw, 34px);
  font-size: 14px;
  font-weight: 700;
}

.nav-links a {
  opacity: 0.86;
}

.nav-links a:hover {
  opacity: 1;
}

.header-actions {
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
}

.menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  place-items: center;
  border: 1px solid rgba(255, 255, 255, 0.32);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.12);
  color: inherit;
  cursor: pointer;
}

.site-header.is-scrolled .menu-toggle {
  border-color: var(--line);
  background: #eef5f4;
}

.menu-bars,
.menu-bars::before,
.menu-bars::after {
  display: block;
  width: 18px;
  height: 2px;
  border-radius: 999px;
  background: currentColor;
  transition:
    transform 180ms ease,
    opacity 180ms ease;
  content: "";
}

.menu-bars {
  position: relative;
}

.menu-bars::before,
.menu-bars::after {
  position: absolute;
  left: 0;
}

.menu-bars::before {
  top: -6px;
}

.menu-bars::after {
  top: 6px;
}

body.nav-open .menu-bars {
  background: transparent;
}

body.nav-open .menu-bars::before {
  transform: translateY(6px) rotate(45deg);
}

body.nav-open .menu-bars::after {
  transform: translateY(-6px) rotate(-45deg);
}

.nav-backdrop {
  position: fixed;
  inset: 0;
  z-index: 18;
  background: rgba(10, 18, 24, 0.38);
  backdrop-filter: blur(2px);
}

.nav-backdrop[hidden] {
  display: none;
}

.language-toggle {
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-width: 94px;
  min-height: 38px;
  padding: 3px;
  border: 1px solid rgba(255, 255, 255, 0.32);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.12);
  color: inherit;
  cursor: pointer;
}

.language-toggle span {
  display: grid;
  min-width: 38px;
  place-items: center;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 800;
}

html:not([lang="zh-CN"]) .language-toggle span:first-child,
html[lang="zh-CN"] .language-toggle span:last-child {
  background: #fff;
  color: var(--teal-dark);
}

.site-header.is-scrolled .language-toggle {
  border-color: var(--line);
  background: #eef5f4;
}

.header-cta,
.primary-action,
.secondary-action,
.contact-form button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  border-radius: 8px;
  font-weight: 800;
}

.header-cta {
  padding: 0 16px;
  background: #fff;
  color: var(--teal-dark);
}

.site-header.is-scrolled .header-cta,
.primary-action,
.contact-form button {
  background: var(--teal);
  color: #fff;
}

.hero {
  position: relative;
  min-height: min(760px, 88vh);
  overflow: hidden;
  isolation: isolate;
}

.hero-media,
.hero-shade {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.hero-media {
  object-fit: cover;
}

.hero-shade {
  z-index: 1;
  background:
    linear-gradient(90deg, rgba(8, 15, 20, 0.88) 0%, rgba(8, 15, 20, 0.72) 37%, rgba(8, 15, 20, 0.18) 77%),
    linear-gradient(180deg, rgba(8, 15, 20, 0.42), rgba(8, 15, 20, 0.08) 42%, rgba(8, 15, 20, 0.38));
}

.hero-content {
  position: relative;
  z-index: 2;
  width: min(720px, calc(100vw - 36px));
  padding: clamp(124px, 18vh, 178px) 0 64px clamp(18px, 5vw, 72px);
  color: #fff;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--amber);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.section-kicker {
  margin: 0 0 14px;
  color: var(--amber);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.06em;
  line-height: 1.35;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1,
h2,
h3 {
  letter-spacing: 0;
}

h1 {
  max-width: 680px;
  margin-bottom: 18px;
  font-size: clamp(40px, 7vw, 78px);
  line-height: 0.96;
}

.hero-lede {
  max-width: 610px;
  margin-bottom: 30px;
  color: rgba(255, 255, 255, 0.82);
  font-size: clamp(17px, 2vw, 21px);
  line-height: 1.55;
}

.hero-actions {
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 42px;
}

.primary-action,
.secondary-action {
  min-width: 172px;
  padding: 0 20px;
}

.secondary-action {
  border: 1px solid rgba(255, 255, 255, 0.36);
  color: #fff;
}

.proof-strip {
  width: min(660px, 100%);
  gap: 1px;
  margin: 0;
}

.proof-strip div {
  flex: 1;
  min-width: 0;
  padding: 15px 17px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(10px);
}

.proof-strip div:first-child {
  border-radius: 8px 0 0 8px;
}

.proof-strip div:last-child {
  border-radius: 0 8px 8px 0;
}

.proof-strip dt {
  margin-bottom: 5px;
  font-size: 18px;
  font-weight: 800;
}

.proof-strip dd {
  margin: 0;
  color: rgba(255, 255, 255, 0.68);
  font-size: 13px;
}

.intro-band,
.trust-strip,
.section,
.site-footer {
  width: min(1180px, calc(100vw - 36px));
  margin: 0 auto;
}

.intro-band {
  align-items: center;
  justify-content: space-between;
  gap: 42px;
  padding: 34px 0 26px;
}

.intro-band h2,
.section-heading h2,
.cta-section h2 {
  margin-bottom: 0;
  font-size: clamp(28px, 4vw, 48px);
  line-height: 1.05;
}

.intro-band > div,
.intro-band > p {
  flex: 1;
}

.intro-band > p,
.section-heading p:not(.section-kicker),
.sticky-copy p:not(.section-kicker),
.cta-section p:not(.section-kicker) {
  color: var(--muted);
  font-size: 17px;
  line-height: 1.7;
}

.trust-strip {
  align-items: stretch;
  gap: 1px;
  padding: 0 0 24px;
}

.trust-strip div {
  flex: 1;
  min-width: 0;
  padding: 18px 20px;
  border: 1px solid var(--line);
  background: #fff;
}

.trust-strip div:first-child {
  border-radius: 8px 0 0 8px;
}

.trust-strip div:last-child {
  border-radius: 0 8px 8px 0;
}

.trust-strip strong {
  display: block;
  margin-bottom: 6px;
  color: var(--teal-dark);
  font-size: clamp(24px, 3vw, 36px);
  line-height: 1;
}

.trust-strip span {
  color: var(--muted);
  font-size: 14px;
  line-height: 1.45;
}

.section {
  padding: 68px 0;
  scroll-margin-top: 96px;
}

.section-heading {
  max-width: 780px;
  flex-direction: column;
  align-items: flex-start;
  margin-bottom: 28px;
}

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

.service-card,
.evidence-card,
.solution-detail,
.process-list li,
.contact-form {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: 0 10px 28px rgba(21, 32, 39, 0.05);
}

.service-card,
.evidence-card {
  min-height: 222px;
  padding: 24px;
}

.service-icon {
  display: inline-grid;
  width: 42px;
  height: 32px;
  place-items: center;
  margin-bottom: 26px;
  border-radius: 7px;
  background: #e7f2f1;
  color: var(--teal-dark);
  font-size: 12px;
  font-weight: 800;
}

.service-card h3,
.evidence-card h3,
.solution-detail h3,
.process-list h3 {
  margin-bottom: 10px;
  font-size: 20px;
  line-height: 1.25;
}

.service-card p,
.evidence-card p,
.solution-detail p,
.process-list p {
  margin-bottom: 0;
  color: var(--muted);
  line-height: 1.62;
}

.split-section {
  display: grid;
  grid-template-columns: minmax(280px, 0.82fr) minmax(0, 1.18fr);
  gap: 44px;
  align-items: start;
}

.sticky-copy {
  position: sticky;
  top: 104px;
  margin-bottom: 0;
}

.solution-panel {
  min-width: 0;
}

.solution-tabs {
  gap: 8px;
  margin-bottom: 12px;
}

.solution-tab {
  min-height: 42px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: #33444d;
  font-weight: 800;
  cursor: pointer;
}

.solution-tab.is-active {
  border-color: rgba(20, 116, 111, 0.28);
  background: var(--teal);
  color: #fff;
}

.solution-detail {
  min-height: 420px;
  padding: clamp(24px, 4vw, 42px);
}

.solution-label {
  margin-bottom: 12px;
  color: var(--amber);
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
}

.solution-detail h3 {
  max-width: 620px;
  font-size: clamp(26px, 4vw, 42px);
}

.solution-detail ul {
  display: grid;
  gap: 12px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.solution-detail li {
  position: relative;
  padding-left: 24px;
  color: #33444d;
  line-height: 1.55;
}

.solution-detail li::before {
  position: absolute;
  top: 0.68em;
  left: 0;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--amber);
  content: "";
}

.evidence-section {
  padding-top: 30px;
}

.case-section {
  padding-top: 34px;
}

.case-showcase {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(320px, 0.92fr);
  gap: 18px;
  align-items: stretch;
}

.case-showcase + .case-showcase {
  margin-top: 18px;
}

.case-showcase:nth-of-type(even) .case-media {
  order: 2;
}

.case-showcase:nth-of-type(even) .case-copy {
  order: 1;
}

.case-media,
.case-copy {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: 0 10px 28px rgba(21, 32, 39, 0.05);
}

.case-media {
  display: grid;
  place-items: center;
  min-height: 420px;
  margin: 0;
  overflow: hidden;
  padding: clamp(12px, 2vw, 20px);
  background:
    radial-gradient(circle at 22% 18%, rgba(20, 116, 111, 0.12), transparent 34%),
    linear-gradient(135deg, #f9fbfb, #eef4f3);
}

.case-media img {
  width: 100%;
  height: 100%;
  border-radius: 6px;
  background: #fff;
  object-fit: contain;
}

.case-media--cover img {
  background: transparent;
  object-fit: cover;
}

.case-copy {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: clamp(24px, 4vw, 42px);
}

.case-badge {
  align-self: flex-start;
  margin-bottom: 18px;
  padding: 7px 10px;
  border-radius: 7px;
  background: #e7f2f1;
  color: var(--teal-dark);
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
}

.case-copy h3 {
  margin-bottom: 14px;
  font-size: clamp(26px, 4vw, 40px);
  line-height: 1.08;
}

.case-copy p:not(.case-badge) {
  color: var(--muted);
  line-height: 1.7;
}

.case-facts {
  display: grid;
  gap: 1px;
  margin: 28px 0 0;
}

.case-facts div {
  display: grid;
  grid-template-columns: minmax(96px, 0.32fr) minmax(0, 1fr);
  gap: 16px;
  padding: 14px 0;
  border-top: 1px solid var(--line);
}

.case-facts dt {
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}

.case-facts dd {
  margin: 0;
  color: #33444d;
  font-weight: 700;
  line-height: 1.45;
}

.evidence-card {
  min-height: 188px;
}

.process-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: step;
}

.process-list li {
  min-height: 260px;
  padding: 22px;
}

.process-list span {
  display: grid;
  width: 38px;
  height: 38px;
  place-items: center;
  margin-bottom: 34px;
  border-radius: 8px;
  background: #f5eadc;
  color: #7d4d13;
  font-weight: 800;
}

.cta-section {
  display: grid;
  grid-template-columns: minmax(280px, 0.92fr) minmax(320px, 1.08fr);
  gap: 46px;
  align-items: start;
  padding-bottom: 88px;
}

.contact-form {
  display: grid;
  gap: 15px;
  padding: clamp(20px, 4vw, 30px);
}

.contact-form label {
  display: grid;
  gap: 7px;
}

.contact-form span {
  color: #33444d;
  font-size: 13px;
  font-weight: 800;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 12px 13px;
  color: var(--ink);
  background: #fbfdfd;
  outline: none;
}

.contact-form input {
  height: 46px;
}

.contact-form textarea {
  min-height: 142px;
  resize: vertical;
}

.contact-form input:focus,
.contact-form textarea:focus {
  border-color: rgba(20, 116, 111, 0.72);
  box-shadow: 0 0 0 3px rgba(20, 116, 111, 0.12);
}

.contact-form button {
  min-height: 48px;
  border: 0;
  cursor: pointer;
}

.contact-form button:disabled {
  cursor: wait;
  opacity: 0.68;
}

.form-note {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.5;
}

.form-status {
  margin: 0;
  padding: 11px 12px;
  border: 1px solid rgba(20, 116, 111, 0.22);
  border-radius: 7px;
  background: #e9f5f3;
  color: var(--teal-dark);
  font-size: 13px;
  line-height: 1.5;
}

.form-status.is-error {
  border-color: rgba(154, 93, 18, 0.34);
  background: #fff4e6;
  color: #75450d;
}

.site-footer {
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 24px 0 36px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

.site-footer p {
  margin-bottom: 0;
}

.site-footer div {
  gap: 18px;
}

.site-footer a {
  color: var(--teal-dark);
  font-weight: 700;
}

@media (max-width: 980px) {
  .site-header {
    grid-template-columns: 1fr auto;
  }

  .menu-toggle {
    display: grid;
  }

  .nav-links {
    position: fixed;
    top: 76px;
    right: 16px;
    z-index: 21;
    align-items: stretch;
    flex-direction: column;
    width: min(320px, calc(100vw - 32px));
    padding: 12px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.98);
    color: var(--ink);
    box-shadow: var(--shadow);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition:
      opacity 180ms ease,
      transform 180ms ease,
      visibility 180ms ease;
  }

  .nav-links a {
    padding: 13px 12px;
    border-radius: 7px;
  }

  .nav-links a:hover {
    background: #eef5f4;
  }

  body.nav-open .nav-links {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .hero {
    min-height: min(760px, 86vh);
  }

  .service-grid,
  .evidence-grid,
  .process-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .intro-band,
  .trust-strip,
  .split-section,
  .cta-section,
  .case-showcase {
    grid-template-columns: 1fr;
  }

  .case-showcase:nth-of-type(even) .case-media,
  .case-showcase:nth-of-type(even) .case-copy {
    order: initial;
  }

  .sticky-copy {
    position: static;
  }
}

@media (max-width: 680px) {
  html {
    scroll-padding-top: 150px;
  }

  .site-header {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 10px;
    padding: 12px 16px;
  }

  .header-actions {
    justify-content: flex-end;
  }

  .nav-links {
    top: 72px;
  }

  .hero {
    min-height: 720px;
  }

  .hero-media {
    object-position: 63% center;
  }

  .hero-shade {
    background:
      linear-gradient(90deg, rgba(8, 15, 20, 0.9), rgba(8, 15, 20, 0.72)),
      linear-gradient(180deg, rgba(8, 15, 20, 0.44), rgba(8, 15, 20, 0.34));
  }

  .hero-content {
    width: min(100vw - 32px, 560px);
    padding: 150px 16px 42px;
  }

  h1 {
    font-size: 43px;
  }

  .proof-strip {
    display: grid;
    grid-template-columns: 1fr;
  }

  .trust-strip {
    display: grid;
    grid-template-columns: 1fr;
  }

  .proof-strip div,
  .proof-strip div:first-child,
  .proof-strip div:last-child,
  .trust-strip div,
  .trust-strip div:first-child,
  .trust-strip div:last-child {
    border-radius: 8px;
  }

  .section {
    padding: 48px 0;
  }

  .service-grid,
  .evidence-grid,
  .process-list {
    grid-template-columns: 1fr;
  }

  .case-media {
    min-height: 320px;
  }

  .case-facts div {
    grid-template-columns: 1fr;
    gap: 5px;
  }

  .solution-tabs {
    overflow-x: auto;
    padding-bottom: 2px;
  }

  .solution-tab {
    flex: 0 0 auto;
  }

  .site-footer,
  .site-footer div {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 430px) {
  .brand-copy strong {
    max-width: 220px;
  }

  .header-cta {
    display: none;
  }

  .primary-action,
  .secondary-action {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}