:root {
  --color-primary: #1E5FBF;
  --color-primary-dark: #174A99;
  --color-primary-light: #E8F0FB;
  --color-text: #1A1A1A;
  --color-text-muted: #5A6271;
  --color-bg: #FFFFFF;
  --color-bg-alt: #F5F7FA;
  --color-border: #E5E7EB;
  --color-footer-bg: #0E2A4D;
  --color-footer-text: #C9D6E8;
  --max-width: 1140px;
  --space-xs: 8px;
  --space-sm: 16px;
  --space-md: 24px;
  --space-lg: 48px;
  --space-xl: 80px;
  --radius: 8px;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--color-text);
}

.logo-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  background: var(--color-primary);
  color: #fff;
  font-weight: 700;
  font-size: 18px;
  border-radius: 6px;
  letter-spacing: -0.5px;
}

.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.logo-text .cn {
  font-size: 16px;
  font-weight: 600;
}

.logo-text .en {
  font-size: 12px;
  color: var(--color-text-muted);
  letter-spacing: 0.5px;
}

.site-nav {
  display: flex;
  gap: 28px;
}

.site-nav a {
  font-size: 14px;
  color: var(--color-text);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.15s;
}

.site-nav a:hover {
  color: var(--color-primary);
}

/* ---------- Hero ---------- */
.hero {
  padding: 96px 0 80px;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: #fff;
  text-align: center;
}

.hero h1 {
  font-size: 40px;
  line-height: 1.3;
  margin-bottom: 18px;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.hero-title-en {
  display: block;
  font-size: 22px;
  font-weight: 400;
  opacity: 0.88;
  margin-top: 10px;
  letter-spacing: 0.3px;
}

.hero-subtitle {
  font-size: 17px;
  max-width: 720px;
  margin: 0 auto 36px;
  opacity: 0.92;
}

.hero-subtitle .cn {
  display: block;
}

.hero-subtitle .en {
  display: block;
  font-size: 15px;
  opacity: 0.82;
  margin-top: 6px;
}

.btn-primary {
  display: inline-block;
  padding: 14px 38px;
  background: #fff;
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 600;
  font-size: 15px;
  border-radius: var(--radius);
  transition: transform 0.15s, box-shadow 0.15s;
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

/* ---------- Sections ---------- */
.section {
  padding: var(--space-xl) 0;
}

.section-alt {
  background: var(--color-bg-alt);
}

.section-title {
  font-size: 30px;
  text-align: center;
  margin-bottom: var(--space-lg);
  font-weight: 700;
  letter-spacing: -0.3px;
}

.section-title .en {
  display: block;
  font-size: 15px;
  font-weight: 400;
  color: var(--color-text-muted);
  margin-top: 8px;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

/* ---------- About ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: var(--space-lg);
  align-items: center;
}

.about-text p {
  margin-bottom: var(--space-md);
}

.about-text p.en {
  color: var(--color-text-muted);
  font-size: 14.5px;
  line-height: 1.7;
}

.about-facts {
  list-style: none;
  background: var(--color-primary-light);
  padding: 8px var(--space-md);
  border-radius: var(--radius);
}

.about-facts li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 0;
  border-bottom: 1px solid rgba(30, 95, 191, 0.12);
}

.about-facts li:last-child {
  border-bottom: none;
}

.fact-label {
  color: var(--color-text-muted);
  font-size: 13.5px;
}

.fact-value {
  color: var(--color-primary-dark);
  font-weight: 600;
  font-size: 14.5px;
}

/* ---------- Services ---------- */
.services-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-md);
}

.service-card {
  background: #fff;
  padding: 28px 22px;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
}

.service-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary);
}

.service-icon {
  width: 48px;
  height: 48px;
  background: var(--color-primary-light);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
  color: var(--color-primary);
}

.service-icon svg {
  width: 24px;
  height: 24px;
  stroke: currentColor;
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.service-card h3 {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 10px;
  line-height: 1.4;
}

.service-card h3 .en {
  display: block;
  font-size: 12.5px;
  color: var(--color-text-muted);
  font-weight: 400;
  margin-top: 4px;
  letter-spacing: 0.3px;
}

.service-card p {
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.65;
}

.service-card p .en {
  display: block;
  margin-top: 8px;
  font-size: 12.5px;
  line-height: 1.6;
}

/* ---------- Advantages ---------- */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}

.advantage-item {
  text-align: center;
  padding: var(--space-md) var(--space-sm);
}

.advantage-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  background: var(--color-primary);
  color: #fff;
  font-size: 22px;
  font-weight: 700;
  border-radius: 50%;
  margin-bottom: 18px;
}

.advantage-item h3 {
  font-size: 18px;
  margin-bottom: 8px;
  font-weight: 600;
}

.advantage-item h3 .en {
  display: block;
  font-size: 12.5px;
  color: var(--color-text-muted);
  font-weight: 400;
  margin-top: 4px;
  letter-spacing: 0.3px;
}

.advantage-item p {
  color: var(--color-text-muted);
  font-size: 14.5px;
  line-height: 1.65;
}

/* ---------- Contact ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}

.contact-card {
  background: var(--color-bg-alt);
  padding: var(--space-lg);
  border-radius: var(--radius);
}

.contact-card.highlight {
  background: var(--color-primary-light);
}

.contact-card h3 {
  font-size: 17px;
  color: var(--color-primary-dark);
  margin-bottom: var(--space-md);
  font-weight: 600;
}

.contact-card dl {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 14px 20px;
}

.contact-card dt {
  font-weight: 600;
  color: var(--color-text);
  font-size: 14px;
  white-space: nowrap;
}

.contact-card dd {
  color: var(--color-text-muted);
  font-size: 14px;
  line-height: 1.6;
}

.contact-card dd a {
  color: var(--color-primary);
  text-decoration: none;
}

.contact-card dd a:hover {
  text-decoration: underline;
}

.contact-card .address-en {
  display: block;
  color: var(--color-text-muted);
  font-size: 12.5px;
  margin-top: 4px;
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--color-footer-bg);
  color: var(--color-footer-text);
  padding: var(--space-lg) 0 var(--space-md);
  font-size: 14px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--space-lg);
  margin-bottom: var(--space-md);
}

.footer-brand h4 {
  color: #fff;
  margin-bottom: 12px;
  font-size: 16px;
  font-weight: 600;
}

.footer-brand p {
  line-height: 1.75;
  font-size: 13.5px;
  color: var(--color-footer-text);
}

.footer-brand .credit-code {
  display: inline-block;
  margin-top: 8px;
  padding: 4px 10px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 4px;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 12px;
  letter-spacing: 0.5px;
}

.footer-col h5 {
  color: #fff;
  margin-bottom: 14px;
  font-size: 14px;
  font-weight: 600;
}

.footer-col ul {
  list-style: none;
}

.footer-col li {
  margin-bottom: 10px;
}

.footer-col a {
  color: var(--color-footer-text);
  text-decoration: none;
  font-size: 13.5px;
  transition: color 0.15s;
}

.footer-col a:hover {
  color: #fff;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--space-md);
  text-align: center;
  font-size: 13px;
  color: rgba(201, 214, 232, 0.7);
  line-height: 1.7;
}

.footer-bottom a {
  color: rgba(201, 214, 232, 0.85);
  text-decoration: none;
}

.footer-bottom a:hover {
  color: #fff;
}

/* ---------- Legal pages ---------- */
.legal-hero {
  background: var(--color-primary-light);
  padding: var(--space-lg) 0 var(--space-md);
  border-bottom: 1px solid var(--color-border);
}

.legal-hero h1 {
  font-size: 28px;
  color: var(--color-primary-dark);
  margin-bottom: 6px;
}

.legal-hero .en-title {
  font-size: 15px;
  color: var(--color-text-muted);
  margin-bottom: 12px;
}

.legal-hero .meta {
  color: var(--color-text-muted);
  font-size: 13.5px;
}

.legal-body {
  max-width: 820px;
  margin: 0 auto;
  padding: var(--space-lg) var(--space-md) var(--space-xl);
}

.legal-body h2 {
  font-size: 20px;
  margin: var(--space-lg) 0 var(--space-sm);
  color: var(--color-primary-dark);
  font-weight: 600;
}

.legal-body h2:first-child {
  margin-top: 0;
}

.legal-body h2 .en {
  display: block;
  font-size: 13px;
  color: var(--color-text-muted);
  font-weight: 400;
  margin-top: 2px;
  letter-spacing: 0.3px;
}

.legal-body p,
.legal-body li {
  color: var(--color-text);
  margin-bottom: 12px;
  font-size: 15px;
  line-height: 1.8;
}

.legal-body .en-block {
  color: var(--color-text-muted);
  font-size: 13.5px;
  line-height: 1.75;
  margin-top: -6px;
  margin-bottom: var(--space-sm);
}

.legal-body ul {
  padding-left: 24px;
  margin-bottom: var(--space-sm);
}

.legal-body ul li {
  margin-bottom: 8px;
}

.legal-back {
  display: inline-block;
  margin-bottom: var(--space-md);
  color: var(--color-primary);
  text-decoration: none;
  font-size: 14px;
}

.legal-back:hover {
  text-decoration: underline;
}

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .about-grid {
    grid-template-columns: 1fr;
  }
  .contact-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }
  .hero h1 {
    font-size: 30px;
  }
  .hero-title-en {
    font-size: 18px;
  }
  .section {
    padding: 56px 0;
  }
}

@media (max-width: 640px) {
  .site-nav {
    display: none;
  }
  .services-grid {
    grid-template-columns: 1fr;
  }
  .advantages-grid {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }
  .hero {
    padding: 56px 0 48px;
  }
  .hero h1 {
    font-size: 24px;
  }
  .hero-title-en {
    font-size: 16px;
  }
  .section-title {
    font-size: 22px;
  }
  .contact-card {
    padding: var(--space-md);
  }
  .contact-card dl {
    grid-template-columns: 1fr;
    gap: 4px 0;
  }
  .contact-card dt {
    margin-top: 10px;
  }
  .contact-card dt:first-child {
    margin-top: 0;
  }
  .legal-hero h1 {
    font-size: 22px;
  }
  .legal-body h2 {
    font-size: 18px;
  }
}