:root {
  --color-blue: #2563eb;
  --color-blue-dark: #1d4ed8;
  --color-text: #1e293b;
  --color-text-secondary: #64748b;
  --color-text-muted: #94a3b8;
  --color-bg: #f8fafc;
  --color-bg-blue: #eff6ff;
  --color-bg-subtle: #f1f5f9;
  --color-border: #e2e8f0;
  --radius-card: 16px;
  --radius-button: 8px;
  --section-py: 96px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--color-text);
  line-height: 1.6;
  background: #fff;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

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

/* Header */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 20px;
  color: var(--color-text);
}

.logo-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--color-blue);
  color: white;
  border-radius: 10px;
}

.desktop-nav {
  display: flex;
  gap: 28px;
}

.nav-link {
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color 0.2s;
}

.nav-link:hover,
.nav-link-active {
  color: var(--color-blue);
}

.header-cta {
  display: inline-flex;
  align-items: center;
  padding: 10px 20px;
  background: var(--color-blue);
  color: white;
  border-radius: var(--radius-button);
  font-size: 14px;
  font-weight: 600;
}

.header-cta:hover { background: var(--color-blue-dark); }

.mobile-menu-toggle { display: none; }

/* Hero */
.hero {
  padding: 110px 0 90px;
  background: linear-gradient(180deg, #eff6ff 0%, #ffffff 100%);
}

.hero-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.hero-title {
  font-size: 48px;
  line-height: 58px;
  margin-bottom: 18px;
}

.hero-title span {
  color: var(--color-blue);
}

.hero-desc {
  font-size: 18px;
  line-height: 28px;
  color: var(--color-text-secondary);
  margin-bottom: 32px;
  max-width: 520px;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  border-radius: var(--radius-button);
  font-size: 15px;
  font-weight: 600;
  transition: all 0.2s;
}

.btn-primary {
  background: var(--color-blue);
  color: white;
  border: none;
}

.btn-primary:hover { background: var(--color-blue-dark); }

.btn-secondary {
  background: white;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover { border-color: var(--color-blue); color: var(--color-blue); }

.hero-image {
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-image img {
  max-width: 100%;
  border-radius: var(--radius-card);
  box-shadow: 0 20px 40px -12px rgba(37, 99, 235, 0.18);
}

/* Sections */
.section-title {
  font-size: 36px;
  line-height: 44px;
  text-align: center;
  margin-bottom: 12px;
}

.section-subtitle {
  font-size: 17px;
  line-height: 26px;
  color: var(--color-text-secondary);
  text-align: center;
  max-width: 560px;
  margin: 0 auto 56px;
}

.services {
  padding: var(--section-py) 0;
}

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

.service-card {
  background: white;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 32px;
  transition: all 0.2s;
}

.service-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 24px -8px rgba(0, 0, 0, 0.08);
  border-color: transparent;
}

.service-icon-wrap {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background: var(--color-bg-blue);
  color: var(--color-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
}

.service-title {
  font-size: 18px;
  margin-bottom: 8px;
}

.service-desc {
  font-size: 15px;
  line-height: 24px;
  color: var(--color-text-secondary);
  margin-bottom: 16px;
}

.service-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-blue);
}

.service-link:hover { color: var(--color-blue-dark); }

/* Process */
.process {
  padding: var(--section-py) 0;
  background: var(--color-bg);
}

.process-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.process-card {
  text-align: center;
  padding: 32px 24px;
  background: white;
  border-radius: var(--radius-card);
}

.process-step {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--color-blue);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  margin: 0 auto 16px;
}

.process-card h3 {
  font-size: 17px;
  margin-bottom: 8px;
}

.process-card p {
  font-size: 14px;
  color: var(--color-text-secondary);
}

/* Trust */
.trust {
  padding: var(--section-py) 0;
}

.trust-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.trust-card {
  text-align: center;
  padding: 32px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
}

.trust-card .icon {
  color: var(--color-blue);
  margin-bottom: 14px;
}

.trust-card h3 {
  font-size: 17px;
  margin-bottom: 8px;
}

.trust-card p {
  font-size: 14px;
  color: var(--color-text-secondary);
}

/* Pricing */
.pricing {
  padding: var(--section-py) 0;
  background: var(--color-bg);
}

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

.pricing-card {
  background: white;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 36px 28px;
  text-align: center;
}

.pricing-card.featured {
  border-color: var(--color-blue);
  box-shadow: 0 12px 30px -10px rgba(37, 99, 235, 0.12);
}

.pricing-card h3 {
  font-size: 18px;
  margin-bottom: 12px;
}

.pricing-price {
  font-size: 40px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 24px;
}

.pricing-price span {
  font-size: 15px;
  font-weight: 400;
  color: var(--color-text-muted);
}

.pricing-features {
  list-style: none;
  margin-bottom: 28px;
}

.pricing-features li {
  padding: 10px 0;
  font-size: 15px;
  color: var(--color-text-secondary);
  border-bottom: 1px solid var(--color-bg-subtle);
}

/* FAQ */
.faq {
  padding: var(--section-py) 0;
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  border: 1px solid var(--color-border);
  border-radius: 12px;
  overflow: hidden;
}

.faq-question {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 22px;
  background: white;
  border: none;
  font-size: 16px;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
}

.faq-answer {
  display: none;
  padding: 0 22px 18px;
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 24px;
}

.faq-item.open .faq-answer { display: block; }
.faq-item.open .faq-icon { transform: rotate(180deg); }

/* CTA */
.cta {
  padding: 90px 0;
  background: linear-gradient(135deg, #1d4ed8 0%, #2563eb 100%);
  color: white;
  text-align: center;
}

.cta h2 {
  font-size: 34px;
  line-height: 42px;
  margin-bottom: 16px;
}

.cta p {
  font-size: 17px;
  opacity: 0.9;
  margin-bottom: 28px;
}

.cta .btn-primary {
  background: white;
  color: var(--color-blue);
}

.cta .btn-primary:hover { background: #f1f5f9; }

/* Footer */
.footer {
  background: #0f172a;
  color: #cbd5e1;
  padding: 64px 0 0;
}

.footer-inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
  gap: 32px;
  padding-bottom: 48px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: white;
  font-weight: 700;
  font-size: 18px;
  margin-bottom: 12px;
}

.footer-tagline {
  font-size: 14px;
  color: #94a3b8;
}

.footer-heading {
  color: white;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 16px;
}

.footer-links,
.footer-contact {
  list-style: none;
}

.footer-links li,
.footer-contact li {
  margin-bottom: 10px;
  font-size: 14px;
}

.footer-links a:hover,
.footer-contact li:hover {
  color: white;
}

.footer-contact li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.footer-bottom {
  border-top: 1px solid #1e293b;
  padding: 24px 0;
  text-align: center;
  font-size: 14px;
  color: #64748b;
}

/* Page styles (cases/wiki list & detail) */
.page-main {
  min-height: calc(100vh - 72px - 300px);
}

.page-hero {
  padding: 64px 0 48px;
  background: linear-gradient(180deg, #f8fafc 0%, #ffffff 100%);
}

.page-back {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-blue);
  margin-bottom: 20px;
}

.page-title {
  font-size: 40px;
  line-height: 48px;
  margin-bottom: 12px;
}

.page-desc {
  font-size: 17px;
  line-height: 26px;
  color: var(--color-text-secondary);
  max-width: 560px;
}

.cases-list-section,
.wiki-list-section {
  padding-bottom: var(--section-py);
}

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

.case-card,
.wiki-card {
  background: white;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 28px;
  transition: all 0.2s;
}

.case-card:hover,
.wiki-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 20px -6px rgba(0, 0, 0, 0.06);
  border-color: transparent;
}

.case-card-meta,
.wiki-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.case-category {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-blue);
  background: var(--color-bg-blue);
  padding: 6px 12px;
  border-radius: var(--radius-button);
}

.case-date,
.wiki-date {
  font-size: 13px;
  color: var(--color-text-muted);
}

.case-card-title,
.wiki-card-title {
  font-size: 19px;
  line-height: 27px;
  margin-bottom: 8px;
}

.case-card-device {
  font-size: 14px;
  color: var(--color-text-muted);
  margin-bottom: 12px;
}

.case-card-summary,
.wiki-card-excerpt {
  font-size: 15px;
  line-height: 24px;
  color: var(--color-text-secondary);
  margin-bottom: 20px;
}

.case-card-footer,
.wiki-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.case-duration,
.wiki-readtime {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--color-text-muted);
}

.case-card-link,
.wiki-card-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-blue);
}

.case-card-link:hover,
.wiki-card-link:hover {
  color: var(--color-blue-dark);
}

.wiki-category {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-blue);
}

.wiki-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}

.wiki-tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 12px;
  color: var(--color-text-secondary);
  background: var(--color-bg-subtle);
  padding: 5px 10px;
  border-radius: var(--radius-button);
}

/* Detail */
.detail-article {
  padding: 48px 0 var(--section-py);
}

.detail-container {
  max-width: 800px;
}

.detail-header {
  margin-bottom: 40px;
}

.detail-category {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-blue);
  background: var(--color-bg-blue);
  padding: 6px 14px;
  border-radius: var(--radius-button);
  margin-bottom: 16px;
}

.detail-title {
  font-size: 34px;
  line-height: 42px;
  margin-bottom: 16px;
}

.detail-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 14px;
  color: var(--color-text-muted);
}

.detail-meta span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.detail-body {
  margin-bottom: 40px;
}

.detail-lead {
  font-size: 17px;
  line-height: 28px;
  color: var(--color-text-secondary);
  margin-bottom: 32px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--color-border);
}

.detail-section {
  margin-bottom: 32px;
}

.detail-section h2 {
  font-size: 22px;
  line-height: 30px;
  margin-bottom: 12px;
}

.detail-section p {
  font-size: 16px;
  line-height: 26px;
  color: var(--color-text-secondary);
}

.detail-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.detail-list li {
  display: flex;
  gap: 12px;
  font-size: 15px;
  line-height: 24px;
  color: var(--color-text-secondary);
}

.detail-list svg {
  color: var(--color-blue);
  flex-shrink: 0;
  margin-top: 2px;
}

.detail-result {
  background: var(--color-bg-blue);
  border-radius: var(--radius-card);
  padding: 24px;
}

.detail-result h2 {
  color: var(--color-blue-dark);
}

.detail-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 32px;
}

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

.not-found {
  text-align: center;
  padding: 120px 0;
}

.not-found h1 {
  font-size: 28px;
  margin-bottom: 24px;
}

/* Responsive */
@media (max-width: 1024px) {
  .services-grid { grid-template-columns: repeat(2, 1fr); }
  .process-grid,
  .trust-grid,
  .pricing-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-inner { grid-template-columns: repeat(3, 1fr); }
  .hero-inner { grid-template-columns: 1fr; }
  .hero-image { order: -1; }
}

@media (max-width: 768px) {
  .desktop-nav,
  .header-cta { display: none; }
  .mobile-menu-toggle {
    display: flex;
    background: none;
    border: none;
    cursor: pointer;
  }
  .hero-title { font-size: 34px; line-height: 42px; }
  .section-title { font-size: 28px; }
  .services-grid,
  .process-grid,
  .trust-grid,
  .pricing-grid,
  .cases-grid,
  .wiki-grid { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; }
  .detail-title { font-size: 26px; line-height: 34px; }
  .detail-actions .btn { width: 100%; }
}