:root {
  --bg: #f4f7fb;
  --surface: #ffffff;
  --surface-alt: #f8fafc;
  --text: #0f172a;
  --muted: #5f6b7a;
  --line: #dbe3ed;
  --line-strong: #cbd5e1;
  --accent: #1d4ed8;
  --accent-soft: #e7efff;
  --shadow: 0 12px 32px rgba(15, 23, 42, 0.05);
  --radius-lg: 20px;
  --radius-md: 14px;
  --radius-sm: 10px;
  --container: min(1140px, calc(100vw - 48px));
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
}

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

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

button {
  font: inherit;
}

.container {
  width: var(--container);
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(255, 255, 255, 0.9);
  border-bottom: 1px solid rgba(15, 23, 42, 0.06);
  backdrop-filter: blur(12px);
}

.header-inner,
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.header-inner {
  min-height: 72px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
}

.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: #0f172a;
  color: #fff;
  font-family: "Manrope", sans-serif;
  font-weight: 800;
  letter-spacing: 0.12em;
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.brand-text strong,
.site-nav a,
.button,
.section-label,
.step-badge {
  font-family: "Manrope", sans-serif;
}

.brand-text strong {
  font-size: 1rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.brand-text small {
  font-size: 0.8rem;
  color: var(--muted);
}

.site-nav {
  display: inline-flex;
  align-items: center;
  gap: 22px;
}

.site-nav a {
  color: #334155;
  font-size: 0.94rem;
  transition: color 180ms ease;
}

.site-nav a:hover,
.site-nav a:focus-visible,
.footer-back:hover,
.footer-back:focus-visible {
  color: var(--accent);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  border: 1px solid transparent;
  border-radius: 12px;
  font-weight: 700;
  transition: background 180ms ease, border-color 180ms ease, color 180ms ease, transform 180ms ease;
}

.button:hover,
.button:focus-visible,
.contact-card:hover,
.contact-card:focus-visible {
  transform: translateY(-1px);
}

.button-primary {
  background: var(--accent);
  color: #fff;
}

.button-secondary {
  background: var(--surface);
  color: var(--text);
  border-color: var(--line);
}

.header-action {
  min-height: 40px;
}

.masthead {
  padding: 36px 0 18px;
}

.section {
  padding: 18px 0;
}

.section-shell {
  padding: 28px;
  border-radius: var(--radius-lg);
  background: var(--surface);
  border: 1px solid rgba(15, 23, 42, 0.06);
  box-shadow: var(--shadow);
}

.masthead-shell {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(280px, 0.85fr);
  gap: 18px;
  align-items: start;
}

.masthead-copy,
.masthead-facts,
.about-grid,
.contact-grid {
  min-width: 0;
}

.section-label {
  display: inline-block;
  margin: 0 0 12px;
  color: var(--accent);
  font-size: 0.82rem;
  letter-spacing: 0.06em;
}

.masthead h1,
.section-heading h2 {
  margin: 0;
  font-family: "Manrope", sans-serif;
  font-weight: 800;
  line-height: 1.18;
}

.masthead h1 {
  font-size: clamp(1.9rem, 3vw, 2.8rem);
  max-width: 640px;
}

.lead,
.section-heading p,
.simple-card p,
.about-copy p {
  color: var(--muted);
}

.lead {
  margin: 16px 0 0;
  max-width: 620px;
}

.masthead-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.masthead-facts {
  display: grid;
  gap: 14px;
}

.masthead-facts div,
.about-facts div {
  display: grid;
  gap: 6px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.masthead-facts div:last-child,
.about-facts div:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.masthead-facts span,
.about-facts span,
.contact-card span {
  font-size: 0.84rem;
  color: var(--muted);
}

.masthead-facts strong,
.masthead-facts a,
.about-facts strong,
.contact-card strong {
  font-family: "Manrope", sans-serif;
  font-size: 1rem;
  line-height: 1.45;
}

.capability-strip {
  padding: 0 0 18px;
}

.uniform-grid,
.capability-grid {
  display: grid;
  gap: 16px;
}

.capability-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.services-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.process-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.advantages-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.contact-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.simple-card {
  padding: 22px;
  border-radius: var(--radius-md);
  background: var(--surface-alt);
  border: 1px solid var(--line);
}

.simple-card h2,
.simple-card h3 {
  margin: 0 0 10px;
  font-family: "Manrope", sans-serif;
  font-size: 1.05rem;
}

.section-heading {
  max-width: 720px;
  margin-bottom: 20px;
}

.section-heading.narrow {
  max-width: 560px;
}

.section-heading p,
.about-copy p,
.simple-card p {
  margin: 0;
}

.step-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  min-height: 28px;
  padding: 0 10px;
  margin-bottom: 14px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.84rem;
  font-weight: 800;
}

.about-shell,
.contact-shell {
  display: grid;
  gap: 20px;
}

.about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, 0.9fr);
  gap: 16px;
}

.about-copy,
.about-facts {
  height: 100%;
}

.about-copy p + p {
  margin-top: 12px;
}

.contact-card {
  display: grid;
  gap: 6px;
}

.contact-card-static {
  cursor: default;
}

.contact-card-static:hover,
.contact-card-static:focus-visible {
  transform: none;
}

.site-footer {
  padding: 24px 0 32px;
}

.footer-inner {
  padding: 20px 24px;
  border-radius: var(--radius-lg);
  background: var(--surface);
  border: 1px solid rgba(15, 23, 42, 0.06);
  box-shadow: var(--shadow);
}

.footer-meta {
  display: grid;
  gap: 6px;
}

.footer-meta p,
.footer-meta a {
  margin: 0;
  color: var(--muted);
}

.footer-back {
  color: var(--muted);
}

@media (max-width: 1080px) {
  .masthead-shell,
  .about-grid {
    grid-template-columns: 1fr;
  }

  .capability-grid,
  .process-grid,
  .contact-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .services-grid,
  .advantages-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 820px) {
  .site-nav,
  .header-action {
    display: none;
  }

  .header-inner {
    min-height: 66px;
  }

  .section-shell {
    padding: 24px;
  }
}

@media (max-width: 640px) {
  :root {
    --container: min(100vw - 32px, 1140px);
  }

  .brand-text small {
    display: none;
  }

  .masthead h1 {
    font-size: clamp(1.7rem, 7vw, 2.2rem);
  }

  .masthead-actions,
  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .capability-grid,
  .services-grid,
  .process-grid,
  .advantages-grid,
  .contact-grid {
    grid-template-columns: 1fr;
  }

  .section-shell,
  .simple-card {
    padding: 20px;
  }
}