:root {
  font-family: "Helvetica Neue", Arial, sans-serif;
  color: #2b2b2b;
  background: #f6f8fb;
  line-height: 1.7;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
}

.container {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid #e5e8ef;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 18px 0;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.15rem;
  color: #1f3a70;
  text-decoration: none;
  line-height: 1;
}

.logo-image {
  width: 32px;
  height: 32px;
  object-fit: contain;
  border-radius: 6px;
  flex-shrink: 0;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

.nav a {
  color: #4a5f7a;
  text-decoration: none;
  font-size: 0.95rem;
}

.nav a:hover {
  color: #1f3a70;
}

.hero {
  padding: 96px 0 80px;
  background: linear-gradient(180deg, #1f3a70 0%, #2f5aa8 100%);
  color: #ffffff;
}

.hero-content {
  max-width: 720px;
}

.hero h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  margin: 0 0 18px;
  line-height: 1.05;
}

.hero p {
  font-size: 1.1rem;
  margin: 0 0 28px;
  color: rgba(255, 255, 255, 0.92);
}

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

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 24px;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 600;
}

.button.primary {
  background: #ff8a00;
  color: #fff;
}

.button.secondary {
  background: rgba(255, 255, 255, 0.18);
  color: #fff;
}

.panel {
  padding: 72px 0;
}

.panel.alt {
  background: #ffffff;
}

.section-grid {
  display: grid;
  gap: 32px;
  align-items: center;
}

.section-description {
  max-width: 680px;
  margin: 12px 0 36px;
  color: #585f6b;
}

.card,
.product-card,
.support-card,
.contact-card,
.download-card {
  background: #ffffff;
  border: 1px solid #e2e7ee;
  border-radius: 18px;
  padding: 28px;
  box-shadow: 0 18px 50px rgba(34, 59, 96, 0.08);
}

.card h3,
.product-card h3,
.support-card h3,
.contact-card h3,
.download-card h3 {
  margin-top: 0;
}

.product-grid,
.support-grid {
  display: grid;
  gap: 24px;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.download-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 20px;
}

.download-button {
  display: inline-flex;
  padding: 14px 24px;
  border-radius: 999px;
  border: 1px solid #1f3a70;
  color: #1f3a70;
  text-decoration: none;
  font-weight: 600;
}

.download-button:hover {
  background: #1f3a70;
  color: #fff;
}

.qr-placeholder {
  width: 200px;
  height: 200px;
  border-radius: 20px;
  background: linear-gradient(135deg, #eef2f8 0%, #dfe7f2 100%);
  color: #7a8aa4;
  display: grid;
  place-items: center;
  font-weight: 700;
  margin: 16px 0;
}

.contact-grid {
  grid-template-columns: 1.4fr 0.8fr;
}

.site-footer {
  padding: 24px 0;
  background: #1f3a70;
  color: #ffffff;
}
.site-footer a {
  color: #ffffff;
  text-decoration: underline;
}

.footer-inner {
  display: flex;
  justify-content: center;
  text-align: center;
}

@media (max-width: 880px) {

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

  .header-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .nav {
    width: 100%;
    justify-content: flex-start;
  }
}

@media (max-width: 640px) {
  .hero {
    padding: 64px 0 56px;
  }

  .hero h1 {
    font-size: 2.4rem;
  }

  .hero-content,
  .panel {
    padding: 0 4px;
  }

  .button {
    width: 100%;
  }
}

.center-container {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 15vh;
  /* 使容器垂直居中于视口 */
}

.text-center {
  text-align: center;
  /* 使文本在容器内水平居中 */
}