:root {
  --bg: #eff3f6;
  --ink: #102538;
  --ink-soft: #3e5a72;
  --brand: #0f3557;
  --brand-2: #1f4f75;
  --accent: #d98a3a;
  --panel: #ffffff;
  --line: #d7e0e8;
  --radius: 16px;
  --shadow: 0 12px 30px rgba(16, 37, 56, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
}

/* Focus styles for accessibility */
a:focus,
button:focus,
.btn:focus {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

a:focus-visible,
button:focus-visible,
.btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.bg-mesh {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(circle at 5% 0%, rgba(31, 79, 117, 0.22), transparent 28%),
    radial-gradient(circle at 85% 15%, rgba(217, 138, 58, 0.2), transparent 26%),
    linear-gradient(150deg, #f6f9fb 0%, #e8eef3 44%, #dfe7ee 100%);
}

.hero {
  min-height: clamp(440px, 68vh, 760px);
  padding: 0 1rem 2.4rem;
}

.nav {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  position: sticky;
  top: 0;
  background: rgba(239, 243, 246, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  z-index: 100;
  padding: 0.8rem 1rem;
  margin: 0 auto;
  border-radius: 0 0 12px 12px;
  box-shadow: 0 2px 12px rgba(16, 37, 56, 0.08);
  transition: box-shadow 0.3s ease;
}

.brand {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
}

.brand img {
  height: 2.5rem;
  max-width: 12rem;
  width: auto;
  display: block;
}

.nav-links {
  display: flex;
  gap: 1rem;
  align-items: center;
}

.nav-links a {
  color: var(--ink);
  text-decoration: none;
  font-size: 0.92rem;
  transition: color 0.2s ease;
}

.nav-links a:hover {
  color: var(--brand);
}

.nav-cta {
  padding: 0.44rem 0.85rem;
  border-radius: 999px;
  border: 1px solid var(--brand);
  transition: all 0.2s ease;
}

.nav-cta:hover {
  background: var(--brand);
  color: #fff;
}

.hero-content {
  max-width: 1100px;
  margin: 2.2rem auto 1rem;
  padding: 2.2rem;
  background: linear-gradient(120deg, rgba(15, 53, 87, 0.9), rgba(31, 79, 117, 0.88));
  color: #fff;
  border-radius: calc(var(--radius) + 4px);
  box-shadow: var(--shadow);
}

.tag {
  margin: 0;
  letter-spacing: 0.1em;
  font-size: 0.75rem;
  opacity: 0.9;
}

h1 {
  margin: 0.65rem 0;
  font-size: clamp(1.55rem, 4vw, 2.7rem);
  line-height: 1.25;
}

.subtitle {
  margin: 0;
  opacity: 0.94;
}

.hero-actions {
  margin-top: 1.4rem;
  display: flex;
  gap: 0.8rem;
  flex-wrap: wrap;
}

.btn {
  text-decoration: none;
  border-radius: 999px;
  padding: 0.58rem 1.1rem;
  font-weight: 600;
  border: 1px solid transparent;
  transition: all 0.25s ease;
  display: inline-block;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(16, 37, 56, 0.2);
}

.btn:active {
  transform: translateY(0);
  box-shadow: 0 2px 8px rgba(16, 37, 56, 0.15);
}

.btn-primary {
  background: var(--accent);
  color: #1f1204;
}

.btn-primary:hover {
  background: #e59847;
}

.btn-ghost {
  border-color: rgba(255, 255, 255, 0.72);
  color: #fff;
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: rgba(255, 255, 255, 0.9);
}

.section {
  max-width: 1100px;
  margin: 0 auto 1.1rem;
  padding: 1.1rem 1rem 2.2rem;
}

.section-head {
  margin-bottom: 1rem;
}

.kicker {
  margin: 0;
  color: var(--ink-soft);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.74rem;
}

h2 {
  margin: 0.22rem 0 0;
  font-size: clamp(1.3rem, 2.4vw, 1.9rem);
}

.lead {
  margin: 0;
  max-width: 860px;
}

.profile-points,
.product-list {
  margin: 0.85rem 0 0;
  padding-left: 1.15rem;
}

.profile-points li,
.product-list li {
  margin-bottom: 0.5rem;
}

.product-list li:last-child,
.profile-points li:last-child {
  margin-bottom: 0;
}

.section-note {
  margin-top: 0.9rem;
  color: var(--ink-soft);
  max-width: 100%;
}

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

.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.05rem;
  box-shadow: 0 6px 18px rgba(16, 37, 56, 0.06);
}

.card h3 {
  margin-top: 0;
  margin-bottom: 0.5rem;
  color: var(--brand);
}

.card p {
  margin: 0;
}


.client-showcase {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 2.5rem 3rem;
  padding: 2rem 1rem;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.6), rgba(239, 243, 246, 0.4));
  border-radius: var(--radius);
  margin-bottom: 1.5rem;
}

.client-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 120px;
  min-height: 56px;
  transition: transform 0.3s ease, opacity 0.3s ease;
  opacity: 0.75;
}

.client-logo:hover {
  transform: scale(1.08);
  opacity: 1;
}

.client-logo img {
  max-height: 56px;
  max-width: 160px;
  width: auto;
  height: auto;
  object-fit: contain;
  filter: grayscale(0.4);
  transition: filter 0.3s ease;
}

.client-logo:hover img {
  filter: grayscale(0);
}


.footer {
  padding-bottom: 2.8rem;
}

.contact-grid {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: 0 6px 18px rgba(16, 37, 56, 0.06);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
}

.contact-grid p {
  margin: 0.6rem 0;
  line-height: 1.8;
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
}

.contact-grid strong {
  color: var(--brand);
  min-width: 90px;
  display: inline-block;
}

.contact-details a {
  color: var(--brand-2);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease;
}

.contact-details a:hover {
  border-bottom-color: var(--brand-2);
}


.copyright {
  margin: 1rem 0 0;
  color: var(--ink-soft);
  font-size: 0.86rem;
  text-align: center;
}

.copyright .separator {
  margin: 0 0.5rem;
  opacity: 0.5;
}

.copyright .icp-link {
  color: var(--ink-soft);
  text-decoration: none;
  transition: color 0.2s ease;
}

.copyright .icp-link:hover {
  color: var(--brand);
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

/* Back to Top Button */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--brand);
  color: #fff;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 16px rgba(15, 53, 87, 0.3);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all 0.3s ease;
  z-index: 99;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--brand-2);
  transform: translateY(-4px);
  box-shadow: 0 6px 20px rgba(15, 53, 87, 0.4);
}

.back-to-top:active {
  transform: translateY(-2px);
}

@media (max-width: 880px) {
  .nav {
    flex-direction: column;
    align-items: flex-start;
  }

  .nav-links {
    flex-wrap: wrap;
  }

  .hero-content {
    margin-top: 1.2rem;
    padding: 1.35rem;
  }

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

  .client-showcase {
    gap: 1.8rem 2rem;
  }

  .client-logo img {
    max-height: 46px;
    max-width: 130px;
  }

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

@media (max-width: 600px) {
  .client-showcase {
    gap: 1.5rem;
    padding: 1.5rem 0.8rem;
  }

  .client-logo img {
    max-height: 40px;
    max-width: 110px;
  }

  .back-to-top {
    bottom: 1.5rem;
    right: 1.5rem;
    width: 44px;
    height: 44px;
  }

  .contact-grid {
    padding: 1rem;
  }

  .contact-grid strong {
    min-width: 70px;
    font-size: 0.9rem;
  }
}