:root {
  --bg: #ffffff;
  --bg-soft: #fbfbfc;
  --ink: #1f2430;
  --ink-soft: #2b3140;
  --muted: #687082;
  --line: #e6e8ec;
  --accent: #8a6a43;
  --accent-soft: #b69977;
  --focus: #4e6b9c;
  --dark: #1f2024;
  --max: 1220px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font-family: Source Han Sans, Geneva, sans-serif;
  line-height: 1.75;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  font-size: 16px;
}

h1,
h2,
h3,
.logo,
.section-sub {
  font-family: Source Han Sans, Geneva, sans-serif;
  letter-spacing: 0.04em;
  font-weight: 400;
}

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

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

.container {
  width: min(var(--max), calc(100% - 56px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid rgba(31, 37, 48, 0.06);
  backdrop-filter: blur(10px);
}

.header-inner {
  min-height: 58px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  line-height: 1;
  padding: 1px 0 0;
  width: 144px;
}

.logo-cn {
  font-size: 31px;
  font-weight: 400;
  letter-spacing: 0.08em;
  color: #1a2230;
  transform: translateX(0.04em);
  text-align: center;
}

.logo-en {
  font-family: Source Han Sans, Geneva, sans-serif;
  font-size: 11px;
  letter-spacing: 0.32em;
  color: #8991a0;
  padding-top: 6px;
  position: relative;
  text-align: center;
}

.logo-en::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 0;
  width: 66px;
  height: 1px;
  transform: translateX(-50%);
  background: linear-gradient(90deg, #707a8d, transparent);
}

.nav {
  display: flex;
  gap: 24px;
}

.nav a {
  font-size: 13px;
  color: #303646;
  position: relative;
  transition: color 0.2s ease;
}

.nav a:hover {
  color: #1f2430;
}

.nav a::after {
  content: "";
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  bottom: -9px;
  width: 0;
  height: 1px;
  background: var(--accent);
  transition: width 0.25s ease;
}

.nav a:hover::after {
  width: 100%;
}

.nav a.is-active {
  color: #1f2430;
}

.nav a.is-active::after {
  width: 100%;
}

.menu-btn {
  display: none;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  min-width: 56px;
  min-height: 40px;
}

.hero {
  padding-top: 0;
}

.hero-slider {
  position: relative;
  overflow: hidden;
  width: 100%;
}

.slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 0.75s ease;
}

.slide img {
  width: 100%;
  height: clamp(620px, 90vh, 1100px);
  object-fit: cover;
}

.slide.is-active {
  position: relative;
  opacity: 1;
}

.slider-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  border: none;
  background: rgba(19, 24, 31, 0.2);
  color: #fff;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  font-size: 30px;
  cursor: pointer;
}

.slider-btn.prev {
  left: 18px;
}

.slider-btn.next {
  right: 18px;
}

.section {
  padding: 72px 0;
}

.light {
  background: var(--bg-soft);
}

.narrow {
  max-width: 980px;
}

.section-main {
  margin: 0;
  font-size: 28px;
  font-weight: 400;
  color: var(--ink-soft);
}

.section-main.center,
.section-sub.center {
  text-align: center;
}

.section-sub {
  margin: 8px 0 22px;
  color: #7e7a72;
  font-size: 14px;
  letter-spacing: 0.11em;
}

.lead {
  margin: 0 0 14px;
  font-size: 19px;
  line-height: 1.9;
  color: #303642;
}

.text {
  margin: 0;
  color: #596172;
  font-size: 16px;
  line-height: 2;
}

.divider {
  margin-top: 34px;
  width: 132px;
  height: 1px;
  background: linear-gradient(90deg, var(--accent-soft), transparent);
}

.split {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 44px;
  align-items: center;
}

.split-text h2 {
  margin: 0;
  font-size: 28px;
  font-weight: 400;
  color: var(--ink-soft);
}

.split-text p {
  margin: 0 0 12px;
  color: #5b6374;
  font-size: 16px;
  line-height: 1.95;
}

.split-media img {
  border: 1px solid #d8dde4;
  box-shadow: 0 16px 28px rgba(17, 22, 29, 0.08);
}

.cards-3,
.cards-2,
.steps {
  display: grid;
  gap: 20px;
}

.cards-3 {
  grid-template-columns: repeat(3, 1fr);
}

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

.card img,
.step img {
  aspect-ratio: 4 / 5;
  object-fit: cover;
  transition: transform 0.45s ease, filter 0.35s ease;
}

.cards-2 .card img {
  aspect-ratio: 16 / 7;
}

.card h3,
.step h3 {
  margin: 14px 0 0;
  font-size: 19px;
  letter-spacing: 0.03em;
  color: #2b3140;
  font-weight: 400;
}

.card p,
.step p {
  margin: 8px 0 0;
  font-size: 15px;
  color: #5f6775;
  line-height: 1.85;
}

.card {
  transition: transform 0.28s ease;
}

.card:hover {
  transform: translateY(-4px);
}

.card:hover img {
  transform: translateY(-2px) scale(1.012);
  filter: saturate(1.03);
}

.steps {
  grid-template-columns: repeat(3, 1fr);
  gap: 34px;
}

.step {
  text-align: center;
}

.step img {
  width: 128px;
  height: 128px;
  margin: 0 auto;
  border-radius: 4px;
  box-shadow: 0 8px 24px rgba(31, 37, 48, 0.12);
}

.step h3 {
  margin-top: 14px;
  font-size: 20px;
  letter-spacing: 0.04em;
  font-weight: 400;
}

.step p {
  max-width: 290px;
  margin: 8px auto 0;
  line-height: 1.9;
  color: #596171;
  font-size: 15px;
}

.footer {
  background: linear-gradient(90deg, #2b2e34 0%, #262a31 50%, #2b2e34 100%);
  color: #c5cad4;
  padding: 30px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  padding: 6px 0 18px;
}

.footer h3 {
  margin: 0 0 6px;
  color: #f1f4f9;
  font-size: 18px;
  letter-spacing: 0.02em;
  font-weight: 400;
}

.footer p {
  margin: 0 0 11px;
  font-size: 11px;
  color: #b3b9c5;
}

.footer-brand {
  display: flex;
  align-items: flex-start;
  padding-top: 4px;
}

.footer-info-grid {
  display: grid;
  grid-template-columns: 1.45fr 1fr 1fr;
  gap: 28px;
}

.footer-col {
  display: grid;
  gap: 10px;
}

.contact-item {
  display: grid;
  grid-template-columns: 74px 1fr;
  gap: 10px;
  align-items: start;
  line-height: 1.6;
}

.contact-label {
  color: #d2d8e3;
  font-size: 12px;
  letter-spacing: 0.03em;
  font-weight: 400;
}

.contact-text {
  color: #adb5c3;
  font-size: 12px;
}

.copyright {
  text-align: center;
  font-size: 11px;
  margin-top: 0;
  color: #8f97a6;
  background: #191b20;
  min-height: 46px;
  display: flex;
  align-items: center;
  justify-content: center;
  letter-spacing: 0.01em;
}

.copyright a {
  color: #aeb6c5;
  text-decoration: none;
  border-bottom: 1px solid rgba(174, 182, 197, 0.45);
}

.copyright a:hover {
  color: #d7deea;
  border-bottom-color: rgba(215, 222, 234, 0.9);
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

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

@media (max-width: 1024px) {
  .split {
    grid-template-columns: 1fr;
  }

  .cards-3,
  .steps {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-info-grid {
    grid-template-columns: 1fr 1fr;
    gap: 22px;
  }
}

@media (max-width: 760px) {
  .logo-cn {
    font-size: 26px;
    letter-spacing: 0.08em;
  }

  .logo-en {
    font-size: 10px;
    letter-spacing: 0.22em;
    padding-top: 5px;
  }

  .logo-en::before {
    width: 44px;
  }

  .container {
    width: calc(100% - 32px);
  }

  .menu-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 58px;
    display: grid;
    gap: 0;
    background: rgba(245, 245, 245, 0.98);
    border-top: 1px solid #dcdee2;
    border-bottom: 1px solid #dcdee2;
    opacity: 0;
    pointer-events: none;
    transform: translateY(-8px);
    transition: all 0.25s ease;
  }

  .nav a {
    min-height: 44px;
    display: flex;
    align-items: center;
    padding: 0 16px;
    border-top: 1px solid #e6e8ec;
  }

  .nav.is-open {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }

  .slide img {
    height: clamp(500px, 78vh, 820px);
  }

  .section {
    padding: 48px 0;
  }

  .section-main {
    font-size: 32px;
  }

  .cards-3,
  .cards-2,
  .steps,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .step img {
    width: 112px;
    height: 112px;
  }

  .footer-grid {
    gap: 14px;
  }

  .footer h3 {
    font-size: 15px;
  }

  .footer-info-grid {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .contact-item {
    grid-template-columns: 70px 1fr;
  }

  .contact-label,
  .contact-text {
    font-size: 11px;
  }
}

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

  .slide,
  .reveal {
    transition: none;
  }
}