:root {
  --c-primary: #1f3a5f;
  --c-primary-600: #2a4c78;
  --c-accent: #3e8e8e;
  --c-bg: #f7f9fb;
  --c-surface: #ffffff;
  --c-text: #22303c;
  --c-body: #3a4a58;
  --c-muted: #5b6b7a;
  --c-border: #e3e9f0;
  --radius: 12px;
  --shadow-sm: 0 1px 2px rgba(31, 58, 95, 0.06);
  --shadow-md: 0 10px 28px rgba(31, 58, 95, 0.09);
  --container: 1120px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.75;
  color: var(--c-text);
  background: var(--c-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: var(--c-primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--c-accent);
}

h1,
h2,
h3,
h4 {
  margin: 0 0 0.6em;
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: 0.01em;
}

h1 {
  font-size: clamp(26px, 3.6vw, 40px);
}

h2 {
  font-size: clamp(21px, 2.4vw, 28px);
}

h3 {
  font-size: 18px;
}

p {
  margin: 0 0 1em;
}

ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  padding: 10px 16px;
  background: var(--c-primary);
  color: #fff;
  border-radius: 0 0 8px 0;
}

.skip-link:focus {
  left: 0;
  color: #fff;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: saturate(180%) blur(10px);
  -webkit-backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--c-border);
  transition: box-shadow 0.2s ease;
}

.site-header.is-scrolled {
  box-shadow: var(--shadow-sm);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 20px;
  height: 72px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
  color: var(--c-text);
}

.brand:hover {
  color: var(--c-text);
}

.brand-mark {
  width: 40px;
  height: 40px;
  flex: none;
}

.brand-text {
  display: flex;
  flex-direction: column;
  min-width: 0;
  line-height: 1.25;
}

.brand-text strong {
  font-size: 16px;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.brand-text small {
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--c-muted);
}

.site-nav {
  margin-left: auto;
}

.site-nav ul {
  display: flex;
  gap: 4px;
}

.site-nav a {
  display: block;
  padding: 9px 14px;
  border-radius: 8px;
  font-size: 15px;
  color: var(--c-text);
  white-space: nowrap;
}

.site-nav a:hover {
  background: #edf2f7;
  color: var(--c-primary);
}

.site-nav a.active {
  background: #edf2f7;
  color: var(--c-primary);
  font-weight: 600;
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  margin-left: auto;
  padding: 0;
  border: 0;
  background: none;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  margin: 5px auto;
  background: var(--c-text);
  border-radius: 2px;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.hero {
  padding: 84px 0 76px;
  background: linear-gradient(180deg, #ffffff 0%, var(--c-bg) 100%);
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: center;
}

.eyebrow {
  display: inline-block;
  margin: 0 0 20px;
  padding: 5px 13px;
  border-radius: 999px;
  background: #e9f1f7;
  color: var(--c-primary);
  font-size: 13px;
  letter-spacing: 0.04em;
}

.hero h1 {
  margin-bottom: 20px;
}

.hero .lead {
  max-width: 34em;
  font-size: 17px;
  color: var(--c-muted);
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 26px;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 500;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease,
    border-color 0.2s ease, color 0.2s ease;
}

.btn-primary {
  background: var(--c-primary);
  color: #fff;
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  background: var(--c-primary-600);
  color: #fff;
  transform: translateY(-1px);
}

.btn-ghost {
  border: 1px solid var(--c-border);
  background: #fff;
  color: var(--c-text);
}

.btn-ghost:hover {
  border-color: var(--c-primary);
  color: var(--c-primary);
}

.hero-art {
  width: 100%;
  max-width: 420px;
  justify-self: end;
}

.section {
  padding: 72px 0;
}

.section--surface {
  background: var(--c-surface);
  border-top: 1px solid var(--c-border);
  border-bottom: 1px solid var(--c-border);
}

.section-head {
  max-width: 660px;
  margin-bottom: 40px;
}

.section-head p {
  margin: 0;
  color: var(--c-muted);
}

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

.card {
  padding: 26px 22px;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.card:hover {
  transform: translateY(-3px);
  border-color: #cfdde9;
  box-shadow: var(--shadow-md);
}

.card-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  margin-bottom: 16px;
  border-radius: 10px;
  background: #edf4f8;
  color: var(--c-primary);
}

.card h3 {
  margin-bottom: 8px;
  font-size: 17px;
}

.card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--c-muted);
}

.facts {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 32px;
}

.fact {
  padding: 20px 22px;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-left: 3px solid var(--c-accent);
  border-radius: 10px;
}

.fact-label {
  display: block;
  margin-bottom: 6px;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--c-muted);
}

.fact strong {
  font-size: 15.5px;
  font-weight: 600;
  line-height: 1.6;
}

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 15px;
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.contact-item {
  display: flex;
  gap: 14px;
  padding: 22px;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: 10px;
}

.ci-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  flex: none;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: #edf4f8;
  color: var(--c-primary);
}

.contact-item dl {
  margin: 0;
  min-width: 0;
}

.contact-item dt {
  margin-bottom: 2px;
  font-size: 13px;
  color: var(--c-muted);
}

.contact-item dd {
  margin: 0;
  font-size: 15.5px;
  word-break: break-word;
}

.page-hero {
  padding: 56px 0 44px;
  background: linear-gradient(180deg, #ffffff 0%, var(--c-bg) 100%);
  border-bottom: 1px solid var(--c-border);
}

.page-hero h1 {
  margin-bottom: 14px;
}

.page-hero p {
  max-width: 52em;
  margin: 0;
  color: var(--c-muted);
}

.breadcrumb {
  margin-bottom: 14px;
  font-size: 13px;
  color: var(--c-muted);
}

.breadcrumb a {
  color: var(--c-muted);
}

.breadcrumb a:hover {
  color: var(--c-primary);
}

.service-block {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 26px;
  padding: 38px 0;
  border-bottom: 1px solid var(--c-border);
}

.service-block:last-child {
  border-bottom: 0;
}

.sb-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 64px;
  height: 64px;
  border-radius: 14px;
  background: #edf4f8;
  color: var(--c-primary);
}

.service-block h2 {
  margin-bottom: 10px;
  font-size: 20px;
}

.sb-desc {
  margin-bottom: 20px;
  color: var(--c-body);
}

.sb-meta {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px 20px;
}

.sb-meta > div {
  padding: 16px 18px;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: 10px;
}

.sb-meta span {
  display: block;
  margin-bottom: 6px;
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--c-muted);
}

.sb-meta p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--c-body);
}

.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  counter-reset: step;
}

.step {
  position: relative;
  padding: 24px 20px 20px;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: 10px;
}

.step::before {
  counter-increment: step;
  content: "0" counter(step);
  position: absolute;
  top: 14px;
  right: 18px;
  font-size: 22px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: #dbe6ef;
}

.step h3 {
  margin-bottom: 6px;
  font-size: 16px;
}

.step p {
  margin: 0;
  font-size: 14px;
  color: var(--c-muted);
}

.prose {
  max-width: 840px;
}

.prose h2 {
  margin-top: 40px;
  font-size: 20px;
}

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

.prose p,
.prose li {
  color: var(--c-body);
}

.prose ul li {
  position: relative;
  margin-bottom: 10px;
  padding-left: 18px;
}

.prose ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.7em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c-accent);
}

.info-list {
  display: grid;
  grid-template-columns: 190px 1fr;
  margin: 0;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  overflow: hidden;
}

.info-list dt,
.info-list dd {
  margin: 0;
  padding: 16px 22px;
  font-size: 15px;
  border-bottom: 1px solid var(--c-border);
}

.info-list dt {
  background: #f4f8fb;
  font-weight: 500;
  color: var(--c-muted);
}

.info-list dd {
  color: var(--c-text);
  word-break: break-word;
}

.info-list > :nth-last-child(1),
.info-list > :nth-last-child(2) {
  border-bottom: 0;
}

.callout {
  margin: 28px 0 0;
  padding: 20px 24px;
  background: #f2f7fa;
  border-left: 3px solid var(--c-accent);
  border-radius: 0 10px 10px 0;
}

.callout p:last-child {
  margin: 0;
}

.site-footer {
  padding: 52px 0 32px;
  background: var(--c-primary);
  color: #cfdbe7;
}

.footer-inner {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1.3fr;
  gap: 32px;
}

.site-footer h4 {
  margin-bottom: 14px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: #fff;
}

.site-footer a {
  color: #cfdbe7;
}

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

.footer-brand {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.footer-mark {
  width: 40px;
  height: 40px;
  flex: none;
}

.footer-brand strong {
  display: block;
  margin-bottom: 8px;
  font-size: 16px;
  color: #fff;
}

.footer-brand p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.85;
}

.footer-links li {
  margin-bottom: 9px;
  font-size: 14px;
  line-height: 1.7;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px 24px;
  margin-top: 38px;
  padding-top: 22px;
  border-top: 1px solid rgba(255, 255, 255, 0.14);
  font-size: 13px;
  color: #a9bccf;
}

.footer-icp a {
  color: #a9bccf;
}

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

@media (max-width: 1000px) {
  .cards {
    grid-template-columns: repeat(2, 1fr);
  }

  .steps {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 900px) {
  .brand-text small {
    display: none;
  }

  .nav-toggle {
    display: block;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    margin: 0;
    padding: 8px 24px 16px;
    background: #fff;
    border-bottom: 1px solid var(--c-border);
    box-shadow: var(--shadow-md);
  }

  .site-nav.is-open {
    display: block;
  }

  .site-nav ul {
    flex-direction: column;
    gap: 0;
  }

  .site-nav a {
    padding: 13px 8px;
    border-radius: 0;
  }

  .hero {
    padding: 56px 0 52px;
  }

  .hero-inner {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .hero-art {
    max-width: 340px;
    justify-self: start;
  }

  .section {
    padding: 52px 0;
  }

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

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

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .service-block {
    grid-template-columns: 1fr;
    gap: 18px;
    padding: 30px 0;
  }
}

@media (max-width: 620px) {
  .container {
    padding: 0 18px;
  }

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

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

  .sb-meta {
    grid-template-columns: 1fr;
  }

  .info-list {
    grid-template-columns: 1fr;
  }

  .info-list dt {
    border-bottom: 0;
    padding-bottom: 4px;
  }

  .info-list dd {
    padding-top: 0;
  }
}