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

:root {
  --color-bg: #f5f5f7;
  --color-bg-white: #ffffff;
  --color-text: #1d1d1f;
  --color-text-secondary: #86868b;
  --color-blue: #0071e3;
  --color-blue-hover: #0077ed;
  --color-border: #d2d2d7;
  --font-stack: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-stack);
  line-height: 1.47059;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--color-blue);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.container {
  max-width: 980px;
  margin: 0 auto;
  padding: 0 22px;
}

.header {
  background-color: rgba(255, 255, 255, 0.8);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 52px;
}

.logo {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: -0.022em;
}

.nav a {
  margin-left: 28px;
  color: var(--color-text);
  text-decoration: none;
  font-size: 12px;
  opacity: 0.8;
  transition: opacity 0.2s;
}

.nav a:hover {
  opacity: 1;
  text-decoration: none;
}

.hero {
  background-color: var(--color-bg);
  padding: 140px 0 160px;
  text-align: center;
}

.eyebrow {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-blue);
  letter-spacing: 0.05em;
  margin-bottom: 16px;
}

.hero h1 {
  font-size: 80px;
  line-height: 1.05;
  font-weight: 700;
  letter-spacing: -0.015em;
  margin-bottom: 24px;
}

.hero .subtitle {
  font-size: 21px;
  line-height: 1.381;
  color: var(--color-text-secondary);
  max-width: 680px;
  margin: 0 auto 40px;
  font-weight: 400;
}

.hero-links {
  display: flex;
  justify-content: center;
  gap: 20px;
}

.btn-primary {
  display: inline-block;
  padding: 12px 24px;
  background-color: var(--color-blue);
  color: #fff;
  border-radius: 980px;
  font-size: 17px;
  font-weight: 400;
  transition: background-color 0.2s;
}

.btn-primary:hover {
  background-color: var(--color-blue-hover);
  text-decoration: none;
}

.btn-secondary {
  display: inline-block;
  padding: 12px 24px;
  color: var(--color-blue);
  font-size: 17px;
  font-weight: 400;
}

.btn-secondary:hover {
  text-decoration: underline;
}

section {
  padding: 120px 0;
}

section:nth-child(odd) {
  background-color: var(--color-bg-white);
}

.section-eyebrow {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-blue);
  letter-spacing: 0.08em;
  text-align: center;
  margin-bottom: 12px;
}

h2 {
  font-size: 48px;
  line-height: 1.08349;
  font-weight: 700;
  letter-spacing: -0.003em;
  text-align: center;
  margin-bottom: 16px;
}

.section-desc {
  text-align: center;
  font-size: 21px;
  line-height: 1.381;
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto 60px;
  font-weight: 400;
}

.service-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.service-card {
  background-color: var(--color-bg);
  border-radius: 18px;
  padding: 40px 30px;
  text-align: center;
  transition: transform 0.3s, box-shadow 0.3s;
}

.service-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.08);
}

.service-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto 20px;
  color: var(--color-blue);
}

.service-card h3 {
  font-size: 21px;
  font-weight: 600;
  margin-bottom: 10px;
  letter-spacing: -0.021em;
}

.service-card p {
  font-size: 15px;
  line-height: 1.4;
  color: var(--color-text-secondary);
}

.case-card {
  display: flex;
  align-items: center;
  gap: 80px;
  background: linear-gradient(135deg, #f5f5f7 0%, #ffffff 100%);
  border-radius: 28px;
  padding: 80px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.06);
}

.case-content {
  flex: 1;
}

.case-content h3 {
  font-size: 40px;
  font-weight: 700;
  letter-spacing: -0.015em;
  margin-bottom: 8px;
}

.case-tag {
  font-size: 17px;
  color: var(--color-blue);
  font-weight: 600;
  margin-bottom: 24px;
}

.case-content > p {
  font-size: 17px;
  line-height: 1.6;
  color: var(--color-text-secondary);
  margin-bottom: 24px;
}

.case-features {
  list-style: none;
}

.case-features li {
  position: relative;
  padding-left: 24px;
  margin-bottom: 12px;
  font-size: 15px;
  color: var(--color-text);
}

.case-features li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 8px;
  height: 8px;
  background-color: var(--color-blue);
  border-radius: 50%;
}

.case-image {
  flex: 0 0 300px;
}

.case-image img {
  border-radius: 32px;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.15);
}

.about-lead {
  font-size: 24px;
  line-height: 1.33341;
  font-weight: 600;
  text-align: center;
  max-width: 760px;
  margin: 0 auto 24px;
  letter-spacing: -0.016em;
}

.about-text {
  font-size: 17px;
  line-height: 1.6;
  color: var(--color-text-secondary);
  text-align: center;
  max-width: 760px;
  margin: 0 auto 60px;
}

.info-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  max-width: 900px;
  margin: 0 auto;
}

.info-item {
  background-color: var(--color-bg);
  border-radius: 18px;
  padding: 28px 20px;
  text-align: center;
}

.info-label {
  display: block;
  font-size: 13px;
  color: var(--color-text-secondary);
  margin-bottom: 8px;
}

.info-value {
  display: block;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
}

.contact-card {
  max-width: 720px;
  margin: 0 auto;
  background-color: var(--color-bg);
  border-radius: 24px;
  padding: 48px;
}

.contact-item {
  display: flex;
  justify-content: space-between;
  padding: 20px 0;
  border-bottom: 1px solid var(--color-border);
}

.contact-item:last-child {
  border-bottom: none;
}

.contact-label {
  font-size: 15px;
  color: var(--color-text-secondary);
}

.contact-value {
  font-size: 15px;
  color: var(--color-text);
  font-weight: 500;
  text-align: right;
}

.page-content {
  padding: 100px 0 120px;
  background-color: var(--color-bg-white);
  min-height: calc(100vh - 52px - 120px);
}

.page-content h1 {
  font-size: 40px;
  font-weight: 700;
  margin-bottom: 12px;
  letter-spacing: -0.015em;
}

.page-content .update-time {
  color: var(--color-text-secondary);
  font-size: 14px;
  margin-bottom: 40px;
}

.page-content h2 {
  text-align: left;
  font-size: 24px;
  margin: 40px 0 16px;
  letter-spacing: -0.015em;
}

.page-content p,
.page-content li {
  color: var(--color-text-secondary);
  font-size: 16px;
  line-height: 1.6;
  margin-bottom: 14px;
}

.page-content ol,
.page-content ul {
  padding-left: 24px;
  margin-bottom: 20px;
}

.page-content li {
  margin-bottom: 10px;
}

.footer {
  background-color: var(--color-bg);
  color: var(--color-text-secondary);
  padding: 40px 0;
  text-align: center;
  font-size: 12px;
  border-top: 1px solid var(--color-border);
}

.footer p {
  margin-bottom: 8px;
}

.footer a {
  color: var(--color-text-secondary);
}

.footer a:hover {
  color: var(--color-text);
}

@media (max-width: 900px) {
  .service-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .case-card {
    flex-direction: column;
    padding: 50px;
    gap: 50px;
  }

  .case-image {
    flex: 0 0 auto;
    max-width: 280px;
  }

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

@media (max-width: 768px) {
  .header .container {
    flex-direction: column;
    height: auto;
    padding: 12px 20px;
  }

  .nav {
    margin-top: 10px;
  }

  .nav a {
    margin-left: 14px;
    margin-right: 0;
    font-size: 12px;
  }

  .hero {
    padding: 100px 0 120px;
  }

  .hero h1 {
    font-size: 42px;
  }

  .hero .subtitle {
    font-size: 18px;
  }

  h2 {
    font-size: 32px;
  }

  .section-desc {
    font-size: 18px;
  }

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

  .case-card {
    padding: 32px;
  }

  .case-content h3 {
    font-size: 28px;
  }

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

  .contact-card {
    padding: 28px;
  }

  .contact-item {
    flex-direction: column;
    gap: 4px;
  }

  .contact-value {
    text-align: left;
  }
}