:root {
  --navy: #07162f;
  --navy-2: #0d2447;
  --blue: #0876e8;
  --cyan: #18d4f7;
  --amber: #ffae20;
  --ink: #172338;
  --muted: #5d6d83;
  --line: #dce5ef;
  --surface: #ffffff;
  --soft: #f4f8fb;
  --shadow: 0 18px 42px rgba(7, 22, 47, 0.16);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

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

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

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 30;
  display: flex;
  width: 100%;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 16px clamp(18px, 5vw, 72px);
  color: #fff;
  transition:
    background 180ms ease,
    color 180ms ease,
    box-shadow 180ms ease;
}

.site-header.is-scrolled {
  background: rgba(255, 255, 255, 0.95);
  color: var(--navy);
  box-shadow: 0 1px 0 rgba(7, 22, 47, 0.1);
  backdrop-filter: blur(14px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
  font-size: 1.05rem;
  font-weight: 800;
  white-space: nowrap;
}

.brand img {
  width: 48px;
  height: 40px;
  object-fit: contain;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  order: 3;
}

.lang-toggle {
  min-width: 58px;
  height: 40px;
  border: 1px solid currentColor;
  border-radius: 8px;
  background: transparent;
  color: inherit;
  font: inherit;
  font-size: 0.84rem;
  font-weight: 850;
  cursor: pointer;
}

.lang-toggle:hover {
  background: rgba(255, 255, 255, 0.14);
}

.site-header.is-scrolled .lang-toggle:hover {
  background: rgba(8, 118, 232, 0.08);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 0.94rem;
  font-weight: 700;
}

.site-nav a {
  border-radius: 7px;
  padding: 10px 12px;
}

.site-nav a:hover {
  background: rgba(255, 255, 255, 0.14);
}

.site-header.is-scrolled .site-nav a:hover {
  background: rgba(8, 118, 232, 0.08);
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid currentColor;
  border-radius: 8px;
  background: transparent;
  color: inherit;
}

.nav-toggle span:not(.sr-only) {
  display: block;
  width: 18px;
  height: 2px;
  margin: 4px auto;
  background: currentColor;
}

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

.hero {
  position: relative;
  min-height: 94vh;
  overflow: hidden;
  background: var(--navy);
  color: #fff;
}

.hero-image {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-shade {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(7, 22, 47, 0.96) 0%, rgba(7, 22, 47, 0.78) 44%, rgba(7, 22, 47, 0.22) 100%),
    linear-gradient(0deg, rgba(7, 22, 47, 0.64) 0%, transparent 52%);
}

.hero-content {
  position: relative;
  z-index: 1;
  width: min(760px, 100%);
  padding: 22vh clamp(18px, 6vw, 84px) 154px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--blue);
  font-size: 0.78rem;
  font-weight: 850;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero .eyebrow,
.dark-band .eyebrow {
  color: var(--cyan);
}

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

h1 {
  margin-bottom: 20px;
  max-width: 720px;
  font-size: clamp(3.2rem, 7.6vw, 6.8rem);
  line-height: 1.05;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 18px;
  font-size: clamp(2rem, 4.6vw, 4.2rem);
  line-height: 1.12;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 10px;
  font-size: 1.18rem;
  line-height: 1.35;
}

.hero-content p {
  max-width: 660px;
  color: rgba(255, 255, 255, 0.88);
  font-size: clamp(1.05rem, 1.8vw, 1.28rem);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  padding: 12px 18px;
  font-weight: 800;
  transition:
    transform 160ms ease,
    box-shadow 160ms ease,
    background 160ms ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button.primary {
  background: var(--amber);
  color: #151b27;
  box-shadow: var(--shadow);
}

.button.secondary {
  border: 1px solid rgba(255, 255, 255, 0.62);
  color: #fff;
}

.hero-strip {
  position: absolute;
  right: clamp(18px, 5vw, 72px);
  bottom: 28px;
  left: clamp(18px, 5vw, 72px);
  z-index: 2;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(12px);
}

.hero-strip span {
  min-height: 72px;
  padding: 22px;
  color: rgba(255, 255, 255, 0.82);
  font-size: 0.88rem;
  font-weight: 760;
}

.section {
  padding: clamp(72px, 10vw, 132px) clamp(18px, 5vw, 72px);
}

.section-title {
  max-width: 900px;
  margin-bottom: 36px;
}

.section-title.compact {
  margin-bottom: 26px;
}

.intro {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(320px, 1.05fr);
  gap: clamp(32px, 6vw, 92px);
  align-items: start;
}

.intro-copy {
  display: grid;
  gap: 16px;
  color: var(--muted);
  font-size: 1.05rem;
}

.capabilities {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--line);
  gap: 1px;
}

.capabilities article {
  min-height: 260px;
  background: #fff;
  padding: clamp(28px, 4vw, 48px);
}

.cap-index {
  display: inline-flex;
  margin-bottom: 28px;
  color: var(--blue);
  font-size: 2.1rem;
  font-weight: 900;
}

.capabilities p,
.solution-grid p,
.industry-grid p,
.advantage-grid p,
.case-copy p,
.case-card p,
.contact-section p,
.process-list p {
  color: var(--muted);
}

.dark-band {
  background: var(--navy);
  color: #fff;
}

.solution-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.solution-grid article {
  min-height: 224px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.06);
  padding: 26px;
}

.solution-grid p,
.dark-band .section-title {
  color: rgba(255, 255, 255, 0.76);
}

.solution-grid h3 {
  color: #fff;
}

.product-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.product-list span {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--soft);
  padding: 12px 16px;
  color: var(--navy-2);
  font-weight: 760;
}

.industry-section {
  background: var(--soft);
}

.industry-grid,
.advantage-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 14px;
}

.industry-grid article,
.advantage-grid article {
  border-top: 4px solid var(--cyan);
  border-radius: 0 0 8px 8px;
  background: #fff;
  padding: 24px;
  box-shadow: 0 8px 24px rgba(7, 22, 47, 0.06);
}

.process-section {
  background: #fff;
}

.process-list {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  background: var(--line);
  list-style: none;
}

.process-list li {
  min-height: 190px;
  background: var(--soft);
  padding: 24px;
}

.process-list span {
  display: block;
  margin-bottom: 10px;
  color: var(--navy);
  font-weight: 900;
}

.cases-section {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, 420px);
  gap: clamp(28px, 6vw, 84px);
  align-items: center;
  background:
    linear-gradient(90deg, rgba(7, 22, 47, 0.94), rgba(13, 36, 71, 0.9)),
    url("hero-av-meeting.png") center / cover;
  color: #fff;
}

.case-copy p {
  color: rgba(255, 255, 255, 0.76);
}

.case-card {
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.08);
  padding: 28px;
  box-shadow: var(--shadow);
}

.case-card span {
  display: inline-flex;
  margin-bottom: 18px;
  color: var(--amber);
  font-weight: 850;
}

.case-card p {
  color: rgba(255, 255, 255, 0.75);
}

.advantage-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.advantage-grid article {
  border-top-color: var(--amber);
}

.contact-section {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, 430px);
  gap: clamp(28px, 6vw, 84px);
  align-items: center;
  padding: clamp(72px, 10vw, 124px) clamp(18px, 5vw, 72px);
  background: linear-gradient(135deg, #edf8ff, #f7fbfd 48%, #fff7e6);
}

.contact-panel {
  display: grid;
  gap: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  padding: 28px;
  box-shadow: var(--shadow);
}

.contact-panel a,
.contact-panel span {
  color: var(--navy-2);
  font-weight: 780;
}

.site-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  padding: 26px clamp(18px, 5vw, 72px);
  background: var(--navy);
  color: rgba(255, 255, 255, 0.78);
  font-size: 0.92rem;
}

.error-page {
  min-height: 100vh;
  background: var(--soft);
}

.error-shell {
  display: grid;
  min-height: 100vh;
  align-content: center;
  gap: 16px;
  padding: 40px clamp(18px, 5vw, 72px);
}

.error-brand {
  color: var(--navy);
}

.error-shell h1 {
  margin-bottom: 0;
  color: var(--navy);
  font-size: clamp(3rem, 8vw, 6rem);
}

@media (max-width: 1100px) {
  .solution-grid,
  .industry-grid,
  .advantage-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .process-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 820px) {
  .site-header {
    padding: 12px 18px;
  }

  .header-actions {
    gap: 8px;
  }

  .brand img {
    width: 42px;
    height: 36px;
  }

  .brand span {
    max-width: 142px;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .nav-toggle {
    display: inline-block;
  }

  .site-nav {
    position: absolute;
    top: 66px;
    right: 18px;
    display: none;
    width: min(310px, calc(100vw - 36px));
    border: 1px solid rgba(7, 22, 47, 0.12);
    border-radius: 8px;
    background: #fff;
    color: var(--navy);
    box-shadow: var(--shadow);
  }

  .site-nav.is-open {
    display: grid;
    padding: 8px;
  }

  .hero {
    min-height: 92vh;
  }

  .hero-content {
    padding-top: 20vh;
    padding-bottom: 220px;
  }

  .hero-shade {
    background:
      linear-gradient(90deg, rgba(7, 22, 47, 0.95), rgba(7, 22, 47, 0.76)),
      linear-gradient(0deg, rgba(7, 22, 47, 0.66), transparent 48%);
  }

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

  .hero-strip span {
    min-height: 58px;
    padding: 15px;
  }

  .intro,
  .capabilities,
  .cases-section,
  .contact-section {
    grid-template-columns: 1fr;
  }

  .capabilities article {
    min-height: auto;
  }
}

@media (max-width: 620px) {
  .site-header {
    gap: 10px;
  }

  .brand {
    gap: 8px;
    font-size: 0.95rem;
  }

  .lang-toggle {
    min-width: 52px;
    height: 38px;
    font-size: 0.78rem;
  }

  .nav-toggle {
    width: 40px;
    height: 38px;
  }

  h1 {
    font-size: 3rem;
  }

  h2 {
    font-size: 2rem;
  }

  .solution-grid,
  .industry-grid,
  .advantage-grid,
  .process-list {
    grid-template-columns: 1fr;
  }

  .hero-actions .button {
    width: 100%;
  }

  .product-list span {
    width: 100%;
  }
}