html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: #0a0a0a;
  background: #ffffff;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", Roboto, "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.solution-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(229, 231, 235, 0.86);
}

.solution-logo {
  display: block;
  width: auto;
  height: 36px;
}
@media (min-width: 768px) {
  .solution-logo {
    height: 40px;
  }
}

.solution-nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  color: #334155;
  font-size: 16px;
  font-weight: 500;
}

.solution-nav-links a {
  color: inherit;
  text-decoration: none;
}

.solution-nav-links a:hover {
  color: #2468f2;
}

@media (max-width: 767px) {
  .solution-nav-links { display: none; }
}

.solution-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid #dbe5f6;
  background: #f5f8fd;
  color: #174ea6;
  border-radius: 999px;
  padding: 8px 16px;
  font-size: 14px;
  font-weight: 600;
}

.hero-shell {
  background:
    radial-gradient(720px 360px at 18% 0%, rgba(36, 104, 242, 0.12), transparent 64%),
    radial-gradient(520px 280px at 88% 20%, rgba(255, 85, 48, 0.10), transparent 68%),
    linear-gradient(180deg, #f7faff 0%, #ffffff 78%);
}

main > section:not(.hero-shell):not(.related-section) {
  padding-top: 96px;
  padding-bottom: 96px;
}

.bg-slate-50 {
  background-color: #f6f7fc;
}

.solution-hero-grid {
  display: grid;
  gap: 48px;
  align-items: center;
}

@media (min-width: 1024px) {
  .solution-hero-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  }
}

.solution-h1 {
  font-size: 36px;
  line-height: 1.15;
  font-weight: 600;
  letter-spacing: 0;
}

@media (min-width: 768px) {
  .solution-h1 {
    font-size: 54px;
    line-height: 1.1;
  }
}

.section-title {
  font-size: 30px;
  line-height: 1.15;
  font-weight: 600;
  letter-spacing: 0;
}

@media (min-width: 768px) {
  .section-title { font-size: 36px; }
}

.lead {
  color: #45515e;
  font-size: 16px;
  line-height: 1.75;
}

@media (min-width: 768px) {
  .lead {
    font-size: 18px;
    line-height: 32px;
  }
}

.metric-card,
.info-card,
.route-card,
.faq-item {
  border: 1px solid #e5e7eb;
  background: #ffffff;
  border-radius: 20px;
}

.info-card,
.route-card {
  padding: 28px;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.info-card h3,
.route-card h3 {
  font-size: 20px;
  line-height: 1.35;
  font-weight: 600;
}

.info-card:hover,
.route-card:hover {
  transform: translateY(-3px);
  border-color: #cfdcf5;
  box-shadow: 0 18px 42px -28px rgba(31, 45, 68, 0.35);
}

.metric-card {
  padding: 24px;
}

.metric-k {
  display: block;
  color: #2468f2;
  font-size: 22px;
  font-weight: 600;
  line-height: 1.2;
}

.metric-v {
  color: #5f5f5f;
  font-size: 13px;
  line-height: 1.55;
  margin-top: 6px;
}

.check-list {
  display: grid;
  gap: 12px;
}

.check-list li {
  position: relative;
  padding-left: 26px;
  color: #334155;
  line-height: 1.7;
}

.check-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 8px;
  border-radius: 999px;
  background: #ff5530;
}

.blue-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 56px;
  padding: 14px 34px;
  border-radius: 12px;
  background: linear-gradient(135deg, #29acfe 0%, #2468f2 100%);
  color: #ffffff;
  font-size: 17px;
  font-weight: 600;
  box-shadow: 0 14px 32px -16px rgba(36, 104, 242, 0.55);
}

.solution-nav .blue-button {
  min-height: 46px;
  padding: 12px 22px;
  border-radius: 999px;
  font-size: 14px;
}

.ghost-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 56px;
  padding: 14px 28px;
  border-radius: 12px;
  border: 1px solid #d8dee9;
  color: #0f172a;
  font-size: 15px;
  font-weight: 600;
  background: #ffffff;
}

@media (max-width: 767px) {
  .blue-button,
  .ghost-button {
    min-height: 48px;
    padding: 12px 20px;
    font-size: 15px;
    border-radius: 12px;
  }

  .metric-k {
    font-size: 20px;
  }
}

.spec-table {
  width: 100%;
  border-collapse: collapse;
  overflow: hidden;
  border-radius: 16px;
  border: 1px solid #e5e7eb;
}

.spec-table th,
.spec-table td {
  border-bottom: 1px solid #e5e7eb;
  padding: 16px;
  text-align: left;
  vertical-align: top;
  line-height: 1.65;
}

.spec-table th {
  width: 28%;
  color: #0f172a;
  background: #f8fafc;
  font-weight: 600;
}

.spec-table tr:last-child th,
.spec-table tr:last-child td {
  border-bottom: 0;
}

.faq-item summary {
  list-style: none;
  cursor: pointer;
  padding: 20px 24px;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.5;
  display: flex;
  justify-content: space-between;
  gap: 18px;
}

.faq-item summary::-webkit-details-marker { display: none; }

.faq-item summary::after {
  content: "+";
  color: #5f5f5f;
  font-size: 22px;
  line-height: 1;
}

.faq-item[open] summary::after { transform: rotate(45deg); }

.faq-body {
  padding: 0 24px 22px;
  color: #45515e;
  line-height: 1.75;
}

.seo-chip {
  display: inline-flex;
  align-items: center;
  border: 1px solid #e5e7eb;
  border-radius: 999px;
  padding: 7px 12px;
  color: #475569;
  background: #ffffff;
  font-size: 13px;
}

.related-section {
  padding: 72px 0;
  background: #ffffff;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  margin-top: 28px;
}

.related-card {
  position: relative;
  display: block;
  min-height: 118px;
  border: 1px solid #e5e7eb;
  border-radius: 20px;
  background: #ffffff;
  padding: 22px 50px 22px 22px;
  color: #0a0a0a;
  text-decoration: none;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.related-card::after {
  content: "→";
  position: absolute;
  right: 22px;
  top: 22px;
  color: #2468f2;
  font-size: 18px;
  line-height: 1;
}

.related-card:hover {
  transform: translateY(-3px);
  border-color: #cfdcf5;
  box-shadow: 0 18px 42px -30px rgba(31, 45, 68, 0.45);
}

.related-title {
  display: block;
  font-size: 18px;
  line-height: 1.4;
  font-weight: 600;
}

.related-desc {
  display: block;
  margin-top: 10px;
  color: #5f5f5f;
  font-size: 14px;
  line-height: 1.65;
}

@media (max-width: 1023px) {
  .related-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 767px) {
  main > section:not(.hero-shell):not(.related-section) {
    padding-top: 64px;
    padding-bottom: 64px;
  }

  .related-section {
    padding: 56px 0;
  }

  .related-grid {
    grid-template-columns: 1fr;
    gap: 14px;
    margin-top: 22px;
  }

  .related-card {
    min-height: auto;
    padding: 20px 48px 20px 20px;
  }

  .spec-table,
  .spec-table tbody,
  .spec-table tr,
  .spec-table th,
  .spec-table td {
    display: block;
    width: 100%;
  }

  .spec-table th {
    border-bottom: 0;
    padding-bottom: 6px;
  }

  .spec-table td {
    padding-top: 8px;
  }
}