:root {
  --color-primary: #0f2745;
  --color-primary-soft: #1d497e;
  --color-accent: #2c6bb3;
  --color-text: #1c2430;
  --color-text-muted: #5d6775;
  --color-bg: #f3f5f8;
  --color-surface: #ffffff;
  --color-border: #d9e0e8;
  --color-footer: #0b1b31;
  --shadow-soft: 0 18px 40px rgba(15, 39, 69, 0.08);
  --radius-lg: 24px;
  --radius-md: 16px;
  --radius-sm: 10px;
  --container-width: 1180px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Inter", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--color-text);
  background: linear-gradient(180deg, #eef2f7 0%, #f8fafc 100%);
  line-height: 1.7;
}

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

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

button,
input,
textarea {
  font: inherit;
}

.container {
  width: min(calc(100% - 48px), var(--container-width));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(14px);
  background: rgba(243, 245, 248, 0.88);
  border-bottom: 1px solid rgba(217, 224, 232, 0.9);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 84px;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
}

.brand-logo {
  display: block;
  width: 86px;
  height: auto;
  flex: 0 0 auto;
}

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

.brand-text strong {
  font-size: 1rem;
}

.brand-text small {
  color: var(--color-text-muted);
  font-size: 0.78rem;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 26px;
}

.site-nav a {
  position: relative;
  color: var(--color-text-muted);
  font-size: 0.96rem;
  transition: color 0.2s ease;
}

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

.site-nav a.is-active::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -10px;
  width: 100%;
  height: 2px;
  border-radius: 999px;
  background: var(--color-accent);
}

.nav-toggle {
  display: none;
  border: 0;
  background: transparent;
  padding: 0;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-primary);
  margin: 5px 0;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.hero-section,
.page-hero {
  padding: 88px 0 48px;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(300px, 0.75fr);
  gap: 32px;
  align-items: stretch;
}

.hero-copy h1,
.page-hero h1 {
  margin: 0 0 18px;
  color: var(--color-primary);
  font-size: clamp(2.3rem, 4vw, 4.2rem);
  line-height: 1.15;
  letter-spacing: -0.03em;
}

.hero-text,
.page-hero p,
.section-heading p {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 1.02rem;
}

.eyebrow {
  margin: 0 0 16px;
  color: var(--color-accent);
  font-size: 0.88rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.hero-actions {
  display: flex;
  gap: 14px;
  margin-top: 30px;
  flex-wrap: wrap;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 24px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 600;
  transition: transform 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button-primary {
  background: var(--color-primary);
  color: var(--color-surface);
}

.button-primary:hover {
  background: var(--color-primary-soft);
}

.button-secondary {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-border);
}

.button-secondary:hover {
  border-color: var(--color-accent);
}

.hero-panel,
.hero-card,
.highlight-card,
.info-card,
.advantage-item,
.service-card,
.process-item,
.contact-card,
.form-card,
.cta-panel {
  background: var(--color-surface);
  border: 1px solid rgba(217, 224, 232, 0.85);
  box-shadow: var(--shadow-soft);
}

.hero-card,
.highlight-card,
.info-card,
.advantage-item,
.contact-card,
.form-card,
.process-item {
  border-radius: var(--radius-lg);
  padding: 28px;
}

.hero-card {
  height: 100%;
  background:
    radial-gradient(circle at top right, rgba(44, 107, 179, 0.18), transparent 30%),
    linear-gradient(180deg, #102849 0%, #0d1d34 100%);
  color: var(--color-surface);
}

.hero-card h2,
.highlight-card h3,
.info-card h3,
.advantage-item h3,
.service-card h2,
.process-item h3,
.contact-card h2,
.contact-card h3,
.form-card h2,
.site-footer h3,
.site-footer h4 {
  margin-top: 0;
}

.feature-list,
.footer-list,
.contact-list {
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.feature-list li,
.footer-list li,
.contact-list li {
  position: relative;
  padding-left: 18px;
  margin-bottom: 12px;
}

.feature-list li::before,
.footer-list li::before,
.contact-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--color-accent);
}

.section {
  padding: 48px 0 88px;
}

.section-alt {
  background: rgba(255, 255, 255, 0.62);
  border-top: 1px solid rgba(217, 224, 232, 0.7);
  border-bottom: 1px solid rgba(217, 224, 232, 0.7);
}

.section-heading {
  max-width: 760px;
  margin: 0 auto 36px;
  text-align: center;
}

.section-heading.left {
  margin-left: 0;
  text-align: left;
}

.section-heading h2 {
  margin: 0 0 14px;
  color: var(--color-primary);
  font-size: clamp(1.8rem, 3vw, 2.8rem);
  line-height: 1.2;
}

.card-grid {
  display: grid;
  gap: 24px;
}

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

.info-card p,
.advantage-item p,
.process-item p,
.service-card p,
.highlight-card p,
.contact-card p {
  margin-bottom: 0;
  color: var(--color-text-muted);
}

.advantage-grid,
.process-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
}

.advantage-item strong,
.service-index {
  display: inline-block;
  margin-bottom: 12px;
  color: var(--color-accent);
  font-size: 1.15rem;
  font-weight: 700;
}

.cta-panel {
  border-radius: calc(var(--radius-lg) + 4px);
  padding: 34px 36px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.cta-panel h2 {
  margin: 8px 0 0;
  color: var(--color-primary);
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  line-height: 1.25;
}

.split-layout,
.contact-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 420px);
  gap: 28px;
  align-items: start;
}

.highlight-card {
  background: linear-gradient(180deg, rgba(15, 39, 69, 0.96), rgba(14, 30, 52, 0.98));
  color: var(--color-surface);
}

.highlight-card p,
.highlight-card .feature-list li {
  color: rgba(255, 255, 255, 0.82);
}

.service-list {
  display: grid;
  gap: 18px;
}

.service-card {
  border-radius: var(--radius-lg);
  padding: 28px 30px;
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr);
  gap: 16px;
  align-items: start;
}

.contact-info {
  display: grid;
  gap: 18px;
}

.contact-list span {
  display: block;
  color: var(--color-text-muted);
  font-size: 0.92rem;
  margin-bottom: 6px;
}

.contact-list strong {
  font-size: 1rem;
  color: var(--color-primary);
}

.contact-form {
  display: grid;
  gap: 16px;
}

.contact-form label {
  display: grid;
  gap: 8px;
}

.contact-form span {
  color: var(--color-primary);
  font-weight: 600;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  color: var(--color-text);
  background: #fbfcfe;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 4px rgba(44, 107, 179, 0.14);
}

.form-feedback {
  min-height: 24px;
  margin: 4px 0 0;
  color: var(--color-accent);
}

.site-footer {
  background: var(--color-footer);
  color: rgba(255, 255, 255, 0.84);
  padding: 34px 0 42px;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.site-footer p,
.site-footer a,
.site-footer li {
  color: rgba(255, 255, 255, 0.72);
}

.footer-brand-row {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 10px;
}

.footer-brand-logo {
  width: 92px;
  height: auto;
  flex: 0 0 auto;
}

.footer-brand-row h3 {
  margin: 0;
}

@media (max-width: 980px) {
  .hero-grid,
  .split-layout,
  .contact-grid,
  .card-grid-3,
  .advantage-grid,
  .process-grid,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .cta-panel,
  .service-card {
    grid-template-columns: 1fr;
  }

  .cta-panel {
    align-items: flex-start;
  }

  .service-card {
    gap: 10px;
  }
}

@media (max-width: 760px) {
  .container {
    width: min(calc(100% - 32px), var(--container-width));
  }

  .header-inner {
    position: relative;
    min-height: 74px;
  }

  .nav-toggle {
    display: inline-block;
  }

  .site-nav {
    position: absolute;
    top: calc(100% + 12px);
    right: 0;
    left: 0;
    display: none;
    flex-direction: column;
    align-items: flex-start;
    gap: 18px;
    padding: 22px;
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.96);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-soft);
  }

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

  .site-nav a.is-active::after {
    bottom: -5px;
  }

  .hero-section,
  .page-hero {
    padding-top: 64px;
  }

  .hero-copy h1,
  .page-hero h1 {
    font-size: 2.2rem;
  }

  .brand-logo {
    width: 72px;
  }

  .footer-brand-row {
    align-items: flex-start;
  }

  .footer-brand-logo {
    width: 76px;
  }

  .hero-card,
  .highlight-card,
  .info-card,
  .advantage-item,
  .contact-card,
  .form-card,
  .process-item,
  .service-card {
    padding: 22px;
  }

  .section {
    padding: 36px 0 68px;
  }
}