:root {
  color-scheme: light;
  --ink: #0d1726;
  --muted: #5e6b7f;
  --soft: #edf3f8;
  --line: #d9e3ee;
  --blue: #1456d9;
  --blue-deep: #0a2d6f;
  --cyan: #24b9c7;
  --orange: #f28a2e;
  --white: #ffffff;
  --shadow: 0 22px 70px rgba(13, 23, 38, 0.13);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Arial, "Microsoft YaHei", "PingFang SC", sans-serif;
  color: var(--ink);
  background: #f7fafc;
  line-height: 1.65;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 20;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 clamp(20px, 5vw, 72px);
  background: rgba(247, 250, 252, 0.82);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(217, 227, 238, 0.7);
  transition: box-shadow 0.2s ease, background 0.2s ease;
}
.site-header.is-scrolled,
.site-header.solid {
  background: rgba(255, 255, 255, 0.94);
  box-shadow: 0 10px 35px rgba(13, 23, 38, 0.08);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}
.brand img {
  width: 42px;
  height: 42px;
  object-fit: cover;
  border-radius: 8px;
  border: 1px solid rgba(20, 86, 217, 0.16);
}
.brand span { display: grid; line-height: 1.1; }
.brand strong { font-size: 17px; letter-spacing: 0; }
.brand small { color: var(--muted); font-size: 12px; margin-top: 4px; }
.wordmark-latin {
  font-family: Georgia, "Times New Roman", Times, serif;
  font-weight: 700;
  letter-spacing: 0;
}

.nav {
  display: flex;
  align-items: center;
  gap: clamp(18px, 3vw, 34px);
  font-size: 15px;
  color: #223149;
}
.nav a { position: relative; padding: 8px 0; }
.nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 2px;
  height: 2px;
  background: var(--blue);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.2s ease;
}
.nav a:hover::after { transform: scaleX(1); }

.menu-button {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  background: var(--white);
  border-radius: 8px;
  padding: 10px;
}
.menu-button span {
  display: block;
  height: 2px;
  background: var(--ink);
  margin: 5px 0;
}

.hero {
  position: relative;
  min-height: 92vh;
  overflow: hidden;
  padding-top: 72px;
  background: radial-gradient(circle at 75% 30%, rgba(36, 185, 199, 0.18), transparent 34%), linear-gradient(135deg, #f8fbff 0%, #eef5fb 47%, #ffffff 100%);
}
.hero-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0.7;
}
.hero-inner {
  position: relative;
  z-index: 1;
  width: min(1180px, calc(100% - 40px));
  min-height: calc(92vh - 72px);
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(340px, 0.95fr);
  align-items: center;
  gap: clamp(34px, 6vw, 86px);
  padding: 46px 0 78px;
}
.eyebrow,
.section-kicker {
  margin: 0 0 14px;
  color: var(--blue);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}
.hero h1 {
  margin: 0;
  font-size: clamp(48px, 8vw, 96px);
  line-height: 0.98;
  letter-spacing: 0;
  color: #071525;
}
.hero-lead {
  max-width: 650px;
  margin: 24px 0 0;
  color: #324157;
  font-size: clamp(18px, 2vw, 22px);
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 22px;
  border-radius: 8px;
  font-weight: 700;
  border: 1px solid transparent;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}
.button:hover { transform: translateY(-2px); }
.button.primary { background: var(--blue); color: var(--white); box-shadow: 0 16px 40px rgba(20, 86, 217, 0.23); }
.button.secondary { background: rgba(255, 255, 255, 0.78); border-color: var(--line); color: #1d2a3d; }

.hero-panel {
  position: relative;
  min-height: 520px;
  border: 1px solid rgba(20, 86, 217, 0.14);
  border-radius: 8px;
  background: #eef7ff;
  box-shadow: var(--shadow);
  overflow: hidden;
}
.hero-product-image {
  width: 100%;
  height: 100%;
  min-height: 520px;
  object-fit: cover;
  object-position: center;
}
.hero-panel::after {
  content: "";
  position: absolute;
  inset: auto 0 0;
  height: 48%;
  background: linear-gradient(180deg, rgba(238, 247, 255, 0), rgba(7, 21, 37, 0.16) 48%, rgba(7, 21, 37, 0.24));
  pointer-events: none;
}
.metrics {
  position: absolute;
  left: 22px;
  right: 22px;
  bottom: 22px;
  z-index: 2;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin: 0;
}
.metrics div {
  padding: 14px;
  border-radius: 8px;
  background: rgba(7, 21, 37, 0.86);
  color: var(--white);
}
.metrics dt { color: #a9bfda; font-size: 12px; }
.metrics dd { margin: 4px 0 0; font-size: 18px; font-weight: 700; }

.section { padding: 92px 0; }
.section-inner { width: min(1180px, calc(100% - 40px)); margin: 0 auto; }
.intro { background: var(--white); padding: 54px 0; }
.intro-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(300px, 0.9fr);
  gap: 60px;
  align-items: start;
}
.intro h2,
.section-heading h2,
.about-grid h2,
.contact-grid h2 {
  margin: 0;
  font-size: clamp(30px, 4vw, 48px);
  line-height: 1.12;
  letter-spacing: 0;
}
.single-line-title {
  max-width: none;
  white-space: nowrap;
}
.intro p:last-child,
.section-heading p,
.contact-grid p,
.about-copy p {
  color: var(--muted);
  font-size: 17px;
}
.section-heading {
  max-width: 800px;
  margin-bottom: 38px;
}
.section-heading.compact { max-width: 680px; }
.product-section { background: #f7fafc; }
.product-layout {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}
.product-card,
.feature-grid article,
.scenario-grid article {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
  padding: 28px;
}
.product-card.wide { grid-column: 1 / -1; }
.product-card h3,
.feature-grid h3,
.scenario-grid h3 { margin: 0 0 12px; font-size: 22px; }
.product-card p,
.feature-grid p,
.scenario-grid p { margin: 0; color: var(--muted); }
.check-list { margin: 0; padding: 0; list-style: none; color: var(--muted); }
.check-list li { position: relative; padding-left: 24px; margin: 9px 0; }
.check-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--cyan);
}
.tags { display: flex; flex-wrap: wrap; gap: 10px; }
.tags span {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  padding: 0 14px;
  border-radius: 8px;
  background: var(--soft);
  color: #1c3659;
  font-weight: 700;
}
.tech-band { background: #071525; color: var(--white); }
.tech-band .section-kicker { color: #6ee5ef; }
.tech-band .section-heading p,
.tech-band .feature-grid p { color: #aebdd2; }
.feature-grid,
.scenario-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}
.feature-grid article {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.14);
}
.feature-grid span {
  display: inline-flex;
  color: #6ee5ef;
  font-weight: 700;
  margin-bottom: 20px;
}
.about-section { background: var(--white); }
.about-grid,
.contact-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(320px, 1.2fr);
  gap: 70px;
}
.about-copy p { margin-top: 0; }
.contact-section { background: #eef5fb; }
.contact-list {
  display: grid;
  gap: 12px;
  font-style: normal;
}
.contact-list div {
  display: grid;
  grid-template-columns: 78px minmax(0, 1fr);
  gap: 18px;
  align-items: start;
  padding: 18px 0;
  border-bottom: 1px solid rgba(13, 23, 38, 0.12);
}
.contact-list span { color: var(--muted); }
.contact-list strong { font-size: 17px; overflow-wrap: anywhere; }

.site-footer {
  background: #071525;
  color: var(--white);
  padding: 34px 0;
}
.footer-inner {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}
.footer-inner p { margin: 6px 0 0; color: #aebdd2; }
.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 16px;
  color: #dbe7f5;
}
.footer-links a:hover { color: #6ee5ef; }

.plain-page { background: #f7fafc; }
.policy-main {
  min-height: 72vh;
  padding: 132px 20px 70px;
}
.policy-content {
  width: min(860px, 100%);
  margin: 0 auto;
  padding: clamp(28px, 5vw, 52px);
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
}
.policy-content h1 { margin: 0 0 24px; font-size: clamp(34px, 5vw, 54px); line-height: 1.1; }
.policy-content h2 { margin: 34px 0 10px; font-size: 22px; }
.policy-content p { color: var(--muted); }
.policy-date { margin-top: 34px; }

@media (max-width: 980px) {
  .hero-inner,
  .intro-grid,
  .about-grid,
  .contact-grid {
    grid-template-columns: 1fr;
  }
  .hero-inner { padding-top: 40px; }
  .hero-panel,
  .hero-product-image { min-height: 430px; }
  .feature-grid,
  .scenario-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 760px) {
  .site-header { height: 66px; padding: 0 18px; }
  .brand img { width: 38px; height: 38px; }
  .brand strong { font-size: 16px; }
  .menu-button { display: block; }
  .nav {
    position: fixed;
    top: 66px;
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 18px 18px;
    background: rgba(255, 255, 255, 0.97);
    border-bottom: 1px solid var(--line);
  }
  .nav.is-open { display: flex; }
  .nav a { padding: 13px 0; }
  .hero { min-height: auto; padding-top: 66px; }
  .hero-inner { min-height: auto; width: min(100% - 32px, 1180px); padding: 38px 0 48px; gap: 28px; }
  .hero h1 { font-size: clamp(42px, 15vw, 64px); }
  .hero-lead { font-size: 17px; }
  .hero-panel,
  .hero-product-image { min-height: 360px; }
  .hero-product-image { object-position: 52% center; }
  .metrics { grid-template-columns: 1fr 1fr 1fr; left: 12px; right: 12px; bottom: 12px; }
  .metrics div { padding: 10px; }
  .metrics dd { font-size: 15px; }
  .section { padding: 66px 0; }
  .intro { padding: 44px 0; }
  .section-inner { width: min(100% - 32px, 1180px); }
  .single-line-title { white-space: normal; }
  .product-layout,
  .feature-grid,
  .scenario-grid { grid-template-columns: 1fr; }
  .product-card.wide { grid-column: auto; }
  .product-card,
  .feature-grid article,
  .scenario-grid article { padding: 22px; }
  .contact-list div { grid-template-columns: 1fr; gap: 4px; }
  .footer-inner { flex-direction: column; align-items: flex-start; width: min(100% - 32px, 1180px); }
  .footer-links { justify-content: flex-start; }
}

@media (max-width: 420px) {
  .hero-actions { flex-direction: column; align-items: stretch; }
  .button { width: 100%; }
  .hero-panel,
  .hero-product-image { min-height: 320px; }
  .hero-product-image { object-position: 55% center; }
  .metrics { gap: 6px; }
  .metrics dt { font-size: 11px; }
  .metrics dd { font-size: 13px; }
}