:root {
  --ink: #10201d;
  --muted: #66736f;
  --paper: #f6f8f4;
  --white: #ffffff;
  --forest: #0c3b32;
  --moss: #5f7c47;
  --cyan: #2fc5d8;
  --line: rgba(16, 32, 29, 0.14);
  --shadow: 0 24px 70px rgba(16, 32, 29, 0.18);
  font-family: "Microsoft YaHei", "Noto Sans SC", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(90deg, rgba(12, 59, 50, 0.05) 1px, transparent 1px),
    linear-gradient(0deg, rgba(12, 59, 50, 0.05) 1px, transparent 1px),
    var(--paper);
  background-size: 44px 44px;
}

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

.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 20;
  display: grid;
  grid-template-columns: 1fr auto auto auto;
  align-items: center;
  gap: 22px;
  padding: 18px clamp(18px, 4vw, 54px);
  color: var(--white);
  transition: background 0.25s ease, box-shadow 0.25s ease, color 0.25s ease;
}

.site-header.is-scrolled,
.site-header.is-open {
  color: var(--ink);
  background: rgba(246, 248, 244, 0.94);
  box-shadow: 0 10px 30px rgba(16, 32, 29, 0.1);
  backdrop-filter: blur(18px);
}

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

.brand-mark {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  border: 1px solid currentColor;
  border-radius: 8px;
  font-family: Georgia, serif;
  font-size: 24px;
}

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

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

.brand small {
  margin-top: 2px;
  font-size: 11px;
  opacity: 0.72;
}

.nav {
  display: flex;
  align-items: center;
  gap: 28px;
  font-size: 14px;
}

.language-switch {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  padding: 3px;
  border: 1px solid currentColor;
  border-radius: 8px;
}

.language-switch button {
  min-width: 34px;
  height: 30px;
  border: 0;
  border-radius: 6px;
  color: inherit;
  background: transparent;
  cursor: pointer;
  font: inherit;
  font-size: 12px;
  font-weight: 800;
}

.language-switch button[aria-pressed="true"] {
  color: var(--forest);
  background: var(--white);
}

.site-header.is-scrolled .language-switch button[aria-pressed="true"],
.site-header.is-open .language-switch button[aria-pressed="true"] {
  color: var(--white);
  background: var(--forest);
}

.header-cta,
.primary-button,
.secondary-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  border-radius: 8px;
  font-weight: 700;
}

.header-cta {
  padding: 0 18px;
  border: 1px solid currentColor;
}

.primary-button {
  padding: 0 24px;
  color: var(--white);
  background: var(--forest);
  box-shadow: 0 14px 30px rgba(12, 59, 50, 0.24);
}

.secondary-button {
  padding: 0 22px;
  border: 1px solid rgba(255, 255, 255, 0.55);
  color: var(--white);
}

.menu-button {
  display: none;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid currentColor;
  border-radius: 8px;
  color: inherit;
  background: transparent;
}

.menu-button span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 5px auto;
  background: currentColor;
}

.hero {
  position: relative;
  min-height: 100svh;
  overflow: hidden;
  color: var(--white);
}

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

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

.hero-shade {
  background:
    linear-gradient(90deg, rgba(3, 23, 29, 0.9) 0%, rgba(3, 23, 29, 0.56) 38%, rgba(3, 23, 29, 0.08) 72%),
    linear-gradient(0deg, rgba(3, 23, 29, 0.5), transparent 38%);
}

.hero-content {
  position: relative;
  z-index: 2;
  width: min(760px, calc(100% - 36px));
  padding: 20vh 0 18vh clamp(18px, 7vw, 96px);
}

.eyebrow,
.section-kicker {
  margin: 0 0 16px;
  color: var(--cyan);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

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

h1 {
  max-width: 12em;
  margin-bottom: 24px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(42px, 7vw, 92px);
  line-height: 0.98;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 18px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(34px, 5vw, 62px);
  line-height: 1.04;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 12px;
  font-size: 22px;
}

.hero-copy {
  max-width: 650px;
  margin-bottom: 30px;
  color: rgba(255, 255, 255, 0.82);
  font-size: clamp(17px, 2vw, 21px);
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.hero-panel {
  position: absolute;
  right: clamp(18px, 5vw, 76px);
  bottom: clamp(18px, 5vw, 56px);
  z-index: 2;
  display: grid;
  grid-template-columns: repeat(4, minmax(104px, 1fr));
  width: min(620px, calc(100% - 36px));
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 8px;
  background: rgba(4, 24, 25, 0.48);
  backdrop-filter: blur(18px);
}

.hero-panel div {
  padding: 20px;
}

.hero-panel div + div {
  border-left: 1px solid rgba(255, 255, 255, 0.2);
}

.hero-panel strong,
.hero-panel span {
  display: block;
}

.hero-panel strong {
  margin-bottom: 8px;
  color: var(--cyan);
  font-family: Georgia, serif;
  font-size: 27px;
}

.hero-panel span {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.76);
}

.section {
  padding: clamp(72px, 9vw, 132px) clamp(18px, 5vw, 76px);
}

.intro-grid {
  display: grid;
  grid-template-columns: minmax(280px, 0.95fr) minmax(280px, 1fr);
  gap: clamp(26px, 6vw, 96px);
  align-items: end;
}

.intro-grid p,
.section-heading p,
.method-copy p,
.capability-main p,
.contact p {
  color: var(--muted);
  font-size: 17px;
  line-height: 1.9;
}

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 30px;
  margin-bottom: 34px;
}

.section-heading p {
  max-width: 520px;
}

.service-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.62);
  box-shadow: var(--shadow);
}

.service-card {
  min-height: 310px;
  padding: 28px;
  background: rgba(255, 255, 255, 0.42);
}

.service-card + .service-card {
  border-left: 1px solid var(--line);
}

.service-card:hover {
  background: var(--forest);
  color: var(--white);
}

.service-card:hover p,
.service-card:hover .card-index {
  color: rgba(255, 255, 255, 0.72);
}

.card-index {
  display: block;
  margin-bottom: 92px;
  color: var(--moss);
  font-family: Georgia, serif;
  font-size: 42px;
}

.service-card p {
  color: var(--muted);
  line-height: 1.85;
}

.ai-industry {
  color: var(--white);
  background:
    linear-gradient(135deg, rgba(47, 197, 216, 0.18), transparent 34%),
    radial-gradient(circle at 88% 20%, rgba(95, 124, 71, 0.34), transparent 28%),
    #0a1816;
}

.ai-layout {
  display: grid;
  grid-template-columns: minmax(280px, 0.75fr) minmax(420px, 1.25fr);
  gap: clamp(28px, 6vw, 88px);
  align-items: start;
}

.ai-copy {
  position: sticky;
  top: 110px;
}

.ai-copy p {
  color: rgba(255, 255, 255, 0.74);
  font-size: 17px;
  line-height: 1.9;
}

.ai-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  margin-top: 12px;
  padding: 0 20px;
  border: 1px solid rgba(255, 255, 255, 0.42);
  border-radius: 8px;
  color: var(--white);
  font-weight: 800;
}

.ai-card-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.ai-card-grid article {
  min-height: 260px;
  padding: 26px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.06);
  backdrop-filter: blur(12px);
}

.ai-card-grid span {
  display: block;
  margin-bottom: 54px;
  color: var(--cyan);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 34px;
}

.ai-card-grid p {
  margin-bottom: 0;
  color: rgba(255, 255, 255, 0.68);
  line-height: 1.8;
}

.method {
  display: grid;
  grid-template-columns: minmax(260px, 0.8fr) minmax(320px, 1.2fr);
  gap: clamp(28px, 7vw, 104px);
  background: #10201d;
  color: var(--white);
}

.method-copy p {
  color: rgba(255, 255, 255, 0.72);
}

.timeline {
  display: grid;
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: step;
}

.timeline li {
  position: relative;
  padding: 24px 26px 24px 74px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.05);
  counter-increment: step;
}

.timeline li::before {
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: 24px;
  top: 24px;
  color: var(--cyan);
  font-family: Georgia, serif;
  font-size: 22px;
}

.timeline span {
  display: block;
  margin-bottom: 8px;
  font-weight: 800;
}

.timeline p {
  margin-bottom: 0;
  color: rgba(255, 255, 255, 0.68);
  line-height: 1.75;
}

.capability-layout {
  display: grid;
  grid-template-columns: minmax(300px, 0.9fr) minmax(320px, 1.1fr);
  gap: 28px;
}

.capability-main {
  padding: clamp(28px, 5vw, 54px);
  border-radius: 8px;
  color: var(--white);
  background:
    radial-gradient(circle at 80% 20%, rgba(47, 197, 216, 0.26), transparent 28%),
    linear-gradient(135deg, #0b3a32, #101917);
}

.capability-main h3 {
  font-family: Georgia, serif;
  font-size: clamp(28px, 4vw, 46px);
  line-height: 1.08;
}

.capability-main p {
  color: rgba(255, 255, 255, 0.76);
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.metric-grid div {
  min-height: 158px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.72);
}

.metric-grid strong,
.metric-grid span {
  display: block;
}

.metric-grid strong {
  margin-bottom: 14px;
  font-size: 22px;
}

.metric-grid span {
  color: var(--muted);
  line-height: 1.7;
}

.search-summary {
  background: #fdfefb;
}

.summary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 14px;
}

.summary-grid article,
.faq-list details {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.72);
}

.summary-grid article {
  min-height: 230px;
  padding: 24px;
}

.summary-grid p,
.faq-list p {
  margin-bottom: 0;
  color: var(--muted);
  line-height: 1.8;
}

.faq {
  padding-top: 0;
}

.faq-list {
  display: grid;
  gap: 12px;
}

.faq-list details {
  padding: 0 22px;
}

.faq-list summary {
  cursor: pointer;
  padding: 20px 0;
  font-weight: 800;
}

.faq-list details[open] {
  background: var(--white);
  box-shadow: 0 16px 40px rgba(16, 32, 29, 0.08);
}

.faq-list details[open] p {
  padding-bottom: 20px;
}

.contact {
  padding: clamp(72px, 9vw, 124px) clamp(18px, 5vw, 76px);
  background: #e8eee4;
}

.contact-inner {
  display: grid;
  grid-template-columns: minmax(280px, 0.9fr) minmax(300px, 520px);
  gap: clamp(28px, 7vw, 92px);
  align-items: start;
}

address {
  display: grid;
  gap: 10px;
  margin-top: 28px;
  font-style: normal;
  color: var(--ink);
}

.contact-card {
  display: grid;
  gap: 14px;
  padding: clamp(22px, 4vw, 34px);
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
  box-shadow: var(--shadow);
}

.contact-label {
  color: var(--muted);
  font-size: 14px;
  font-weight: 800;
}

.contact-phone {
  color: var(--forest);
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(34px, 6vw, 58px);
  line-height: 1;
}

.contact-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.contact-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--forest);
  font-weight: 800;
}

.contact-action-wechat {
  color: var(--white);
  background: var(--forest);
  box-shadow: 0 12px 24px rgba(12, 59, 50, 0.18);
}

.wechat-note {
  min-height: 20px;
  font-size: 13px;
}

.contact-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.8;
}

.footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 14px;
  padding: 24px clamp(18px, 5vw, 76px);
  color: rgba(255, 255, 255, 0.66);
  background: #08110f;
  font-size: 14px;
}

.mobile-call {
  display: none;
}

@media (max-width: 980px) {
  .site-header {
    grid-template-columns: 1fr auto auto;
    gap: 10px;
  }

  .nav,
  .header-cta {
    display: none;
  }

  .menu-button {
    display: block;
  }

  .language-switch {
    order: 2;
  }

  .menu-button {
    order: 3;
  }

  .site-header.is-open .nav {
    position: absolute;
    top: 78px;
    left: 18px;
    right: 18px;
    display: grid;
    gap: 0;
    padding: 8px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--white);
    box-shadow: var(--shadow);
  }

  .site-header.is-open .nav a {
    padding: 16px;
  }

  .intro-grid,
  .ai-layout,
  .method,
  .capability-layout,
  .contact-inner {
    grid-template-columns: 1fr;
  }

  .ai-copy {
    position: static;
  }

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

  .service-card:nth-child(3) {
    border-left: 0;
    border-top: 1px solid var(--line);
  }

  .service-card:nth-child(4) {
    border-top: 1px solid var(--line);
  }
}

@media (max-width: 680px) {
  body {
    padding-bottom: 76px;
    background-size: 28px 28px;
  }

  .site-header {
    padding: 12px 14px;
  }

  .site-header.is-open .nav {
    top: 66px;
    left: 14px;
    right: 14px;
  }

  .brand {
    gap: 9px;
  }

  .brand-mark {
    width: 36px;
    height: 36px;
    font-size: 20px;
  }

  .brand strong {
    max-width: 9em;
    overflow: hidden;
    font-size: 14px;
    text-overflow: ellipsis;
  }

  .brand small {
    display: none;
  }

  .menu-button {
    width: 40px;
    height: 40px;
  }

  .hero {
    min-height: 100svh;
  }

  .hero-image {
    object-position: 61% center;
  }

  .hero-shade {
    background:
      linear-gradient(90deg, rgba(3, 23, 29, 0.88) 0%, rgba(3, 23, 29, 0.58) 58%, rgba(3, 23, 29, 0.18) 100%),
      linear-gradient(0deg, rgba(3, 23, 29, 0.78), transparent 48%);
  }

  .hero-content {
    width: calc(100% - 28px);
    padding: 112px 0 280px 14px;
  }

  .eyebrow,
  .section-kicker {
    margin-bottom: 12px;
    font-size: 12px;
  }

  h1 {
    max-width: 9em;
    margin-bottom: 18px;
    font-size: clamp(34px, 11vw, 46px);
    line-height: 1.08;
  }

  h2 {
    font-size: clamp(28px, 9vw, 38px);
    line-height: 1.12;
  }

  h3 {
    font-size: 20px;
  }

  .hero-copy {
    margin-bottom: 22px;
    font-size: 16px;
    line-height: 1.75;
  }

  .hero-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
  }

  .primary-button,
  .secondary-button {
    min-height: 44px;
    padding: 0 14px;
    font-size: 14px;
  }

  .hero-panel,
  .service-grid,
  .ai-card-grid,
  .metric-grid,
  .summary-grid {
    grid-template-columns: 1fr;
  }

  .hero-panel {
    right: 14px;
    bottom: 24px;
    width: calc(100% - 28px);
  }

  .hero-panel div {
    display: grid;
    grid-template-columns: 70px 1fr;
    align-items: center;
    padding: 12px 16px;
  }

  .hero-panel strong {
    margin-bottom: 0;
    font-size: 22px;
  }

  .hero-panel div + div,
  .service-card + .service-card {
    border-left: 0;
    border-top: 1px solid rgba(255, 255, 255, 0.2);
  }

  .section,
  .contact {
    padding: 56px 16px;
  }

  .intro-grid p,
  .section-heading p,
  .method-copy p,
  .capability-main p,
  .contact p {
    font-size: 15px;
    line-height: 1.78;
  }

  .section-heading {
    margin-bottom: 22px;
  }

  .service-grid {
    border-radius: 8px;
  }

  .service-card {
    min-height: auto;
    padding: 22px;
  }

  .ai-card-grid article {
    min-height: auto;
    padding: 22px;
  }

  .ai-card-grid span {
    margin-bottom: 28px;
    font-size: 30px;
  }

  .card-index {
    margin-bottom: 28px;
    font-size: 34px;
  }

  .section-heading {
    display: block;
  }

  .method {
    gap: 24px;
  }

  .timeline {
    gap: 12px;
  }

  .timeline li {
    padding: 20px 18px 20px 58px;
  }

  .timeline li::before {
    left: 18px;
    top: 20px;
    font-size: 18px;
  }

  .capability-main {
    padding: 26px 22px;
  }

  .metric-grid div {
    min-height: auto;
    padding: 20px;
  }

  .summary-grid article {
    min-height: auto;
    padding: 20px;
  }

  .faq-list details {
    padding: 0 18px;
  }

  .faq-list summary {
    padding: 18px 0;
  }

  .contact-inner {
    gap: 22px;
  }

  address {
    gap: 8px;
    margin-top: 22px;
    font-size: 14px;
    line-height: 1.7;
  }

  .contact-card {
    gap: 12px;
    padding: 22px;
  }

  .contact-actions {
    grid-template-columns: 1fr;
  }

  .contact-phone {
    font-size: clamp(34px, 11vw, 44px);
  }

  .footer {
    display: grid;
    padding: 20px 16px;
    font-size: 12px;
    line-height: 1.6;
  }

  .mobile-call {
    position: fixed;
    right: 14px;
    bottom: 12px;
    left: 14px;
    z-index: 30;
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 56px;
    padding: 0 18px;
    border-radius: 8px;
    color: var(--white);
    background: #0c3b32;
    box-shadow: 0 16px 36px rgba(7, 23, 21, 0.28);
  }

  .mobile-call span {
    font-size: 14px;
    opacity: 0.82;
  }

  .mobile-call strong {
    font-family: Georgia, "Times New Roman", serif;
    font-size: 22px;
  }
}

@media (max-width: 380px) {
  .hero-actions {
    grid-template-columns: 1fr;
  }

  h1 {
    font-size: 32px;
  }

  .contact-phone,
  .mobile-call strong {
    font-size: 28px;
  }
}