:root {
  --color-primary: #1a56db;
  --color-primary-dark: #1542a6;
  --color-text: #1f2937;
  --color-text-light: #6b7280;
  --color-bg-alt: #f7f9fc;
  --color-border: #e5e7eb;
  --max-width: 1140px;
  --radius: 12px;
  --shadow: 0 8px 24px rgba(17, 24, 39, 0.06);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei",
    "Helvetica Neue", Arial, sans-serif;
  color: var(--color-text);
  line-height: 1.7;
  background: #fff;
  -webkit-font-smoothing: antialiased;
}

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

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

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Navbar ===== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--color-border);
}

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

.brand {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.brand-mark {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 1px;
}

.brand-sub {
  font-size: 11px;
  color: var(--color-text-light);
  letter-spacing: 2px;
}

.nav-links {
  display: flex;
  gap: 32px;
}

.nav-links a {
  font-size: 15px;
  color: var(--color-text);
  font-weight: 500;
  transition: color 0.2s ease;
}

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

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  background: none;
  border: none;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
}

/* ===== Hero ===== */
.hero {
  background:
    radial-gradient(circle at 80% -10%, rgba(26, 86, 219, 0.12), transparent 45%),
    linear-gradient(180deg, #f7f9fc 0%, #ffffff 100%);
  padding: 110px 0 96px;
}

.hero-inner { max-width: 760px; }

.hero-eyebrow {
  display: inline-block;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
  letter-spacing: 1px;
  margin-bottom: 18px;
}

.hero-title {
  font-size: 44px;
  font-weight: 800;
  line-height: 1.35;
  margin-bottom: 24px;
  color: #111827;
}

.hero-desc {
  font-size: 16px;
  color: var(--color-text-light);
  max-width: 620px;
  margin-bottom: 36px;
}

.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 30px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  transition: all 0.2s ease;
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
}
.btn-primary:hover { background: var(--color-primary-dark); }

.btn-ghost {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}
.btn-ghost:hover { background: rgba(26, 86, 219, 0.08); }

/* ===== Section common ===== */
.section { padding: 88px 0; }
.section-alt { background: var(--color-bg-alt); }

.section-head {
  max-width: 640px;
  margin: 0 auto 48px;
  text-align: center;
}

.section-tag {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--color-primary);
  margin-bottom: 10px;
}

.section-title {
  font-size: 30px;
  font-weight: 800;
  color: #111827;
  margin-bottom: 14px;
}

.section-desc {
  color: var(--color-text-light);
  font-size: 15px;
}

/* ===== About ===== */
.about-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 56px;
  align-items: start;
}

.about-text p {
  color: var(--color-text-light);
  margin-bottom: 18px;
  font-size: 15px;
}

.about-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.stat-card {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 26px 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.stat-num {
  font-size: 26px;
  font-weight: 800;
  color: var(--color-primary);
}

.stat-label {
  font-size: 13px;
  color: var(--color-text-light);
}

/* ===== Services ===== */
.service-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.service-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: var(--shadow);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.service-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 36px rgba(17, 24, 39, 0.1);
}

.service-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  margin-bottom: 20px;
  background: linear-gradient(135deg, var(--color-primary), #4f8cff);
  position: relative;
}

.service-icon::after {
  content: "";
  position: absolute;
  inset: 14px;
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.85);
}

.service-card h3 {
  font-size: 19px;
  font-weight: 700;
  margin-bottom: 12px;
  color: #111827;
}

.service-card p {
  color: var(--color-text-light);
  font-size: 14.5px;
}

.service-footnote {
  margin-top: 36px;
  font-size: 13px;
  color: var(--color-text-light);
  text-align: center;
  border-top: 1px dashed var(--color-border);
  padding-top: 24px;
}

/* ===== Advantages ===== */
.adv-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.adv-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px 22px;
  background: #fff;
}

.adv-card h3 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--color-primary);
}

.adv-card p {
  font-size: 14px;
  color: var(--color-text-light);
}

/* ===== Contact ===== */
.section-contact { background: var(--color-bg-alt); }

.contact-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.contact-item {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 26px 22px;
  text-align: center;
}

.contact-item h4 {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 8px;
  color: #111827;
}

.contact-item p {
  font-size: 13.5px;
  color: var(--color-text-light);
}

/* ===== Footer ===== */
.footer {
  background: #101828;
  color: #cbd5e1;
  padding: 36px 0;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  gap: 8px;
  text-align: center;
  font-size: 13px;
}

.footer-note { color: #8b97a8; max-width: 720px; margin: 0 auto; }

/* ===== Responsive ===== */
@media (max-width: 960px) {
  .about-grid { grid-template-columns: 1fr; }
  .service-grid { grid-template-columns: 1fr; }
  .adv-grid { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr 1fr; }
  .hero-title { font-size: 34px; }
}

@media (max-width: 720px) {
  .nav-links {
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: #fff;
    flex-direction: column;
    padding: 16px 24px;
    border-bottom: 1px solid var(--color-border);
    display: none;
    gap: 16px;
  }
  .nav-links.open { display: flex; }
  .nav-toggle { display: flex; }
  .adv-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .hero { padding: 80px 0 64px; }
  .hero-title { font-size: 28px; }
  .section { padding: 64px 0; }
}