:root {
  --blue: #1F55A5;
  --blue-dark: #163E7A;
  --blue-light: #EAF1FB;
  --gold: #F7C454;
  --ink: #1B2534;
  --muted: #5B6B80;
  --bg: #F6F8FB;
  --line: #DFE6EF;
  --white: #FFFFFF;
  --radius: 8px;
  --shadow: 0 10px 28px rgba(27, 37, 52, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Microsoft YaHei", "PingFang SC", "Segoe UI", Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
}

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

a:hover {
  color: var(--blue-dark);
}

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

.container {
  width: min(1120px, calc(100% - 48px));
  margin: 0 auto;
}

.narrow {
  width: min(860px, calc(100% - 48px));
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid var(--line);
}

.site-header.scrolled {
  box-shadow: var(--shadow);
}

.header-inner {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

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

.brand-logo {
  height: 44px;
  width: auto;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 22px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-list a {
  color: var(--ink);
  font-weight: 600;
  padding: 8px 2px;
}

.nav-list a:hover {
  color: var(--blue);
}

.has-dropdown {
  position: relative;
}

.dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 180px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  list-style: none;
  margin: 8px 0 0;
  padding: 8px;
  display: none;
}

.has-dropdown.open .dropdown {
  display: block;
}

.dropdown a {
  display: block;
  padding: 8px 10px;
  border-radius: 6px;
}

.dropdown a:hover {
  background: var(--blue-light);
}

.header-phone {
  font-weight: 700;
  color: var(--blue);
  white-space: nowrap;
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
  cursor: pointer;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 4px;
}

.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--ink);
  border-radius: 2px;
}

.hero {
  position: relative;
  overflow: hidden;
  background: var(--blue-dark);
  color: var(--white);
  padding: 96px 0 88px;
}

.hero-3d-bg {
  position: absolute;
  inset: 0;
  width: 200%;
  left: -50%;
  height: 200%;
  border: 0;
  top: -30%;
  pointer-events: none;
  z-index: 0;
  opacity: 0.7;
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.08) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.9), rgba(0, 0, 0, 0.2));
}

.hero-inner {
  position: relative;
  z-index: 1;
  max-width: 860px;
}
 
 


.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-size: 13px;
  font-weight: 700;
  color: var(--blue);
  margin: 0 0 12px;
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  background: var(--gold);
}

.hero h1 {
  font-size: clamp(34px, 5vw, 56px);
  line-height: 1.15;
  margin: 0 0 18px;
}

.hero-lead {
  font-size: 18px;
  color: rgba(255, 255, 255, 0.88);
  max-width: 720px;
  margin: 0 0 30px;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 22px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  font-weight: 700;
  cursor: pointer;
}

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

.btn-primary:hover {
  background: #F5B72E;
  color: var(--blue-dark);
}

.btn-ghost {
  border-color: rgba(255, 255, 255, 0.55);
  color: var(--white);
  background: transparent;
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.12);
  color: var(--white);
}

.section {
  padding: 72px 0;
}

.band {
  background: var(--white);
}

.band-alt {
  background: var(--bg);
}

.section-head {
  margin-bottom: 34px;
}

.section-head h2 {
  font-size: 30px;
  line-height: 1.3;
  margin: 0;
}

.article-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 22px;
}

.article-card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
  display: flex;
  flex-direction: column;
  box-shadow: 0 4px 14px rgba(27, 37, 52, 0.04);
}

.card-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--muted);
  font-size: 13px;
  margin-bottom: 12px;
}

.category-label {
  color: var(--blue);
  font-weight: 700;
}

.article-card h2,
.article-card h3 {
  font-size: 19px;
  line-height: 1.4;
  margin: 0 0 10px;
}

.article-card p {
  color: var(--muted);
  margin: 0 0 16px;
  flex: 1;
}

.card-link {
  font-weight: 700;
}

.empty-state {
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  padding: 42px;
  text-align: center;
  color: var(--muted);
  background: var(--white);
}

.topic-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 22px;
}

.topic-card {
  display: block;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
  color: var(--ink);
  box-shadow: 0 4px 14px rgba(27, 37, 52, 0.04);
}

.topic-card h3 {
  margin: 0 0 8px;
  font-size: 20px;
  color: var(--blue);
}

.topic-card p {
  color: var(--muted);
  margin: 0 0 14px;
}

.topic-count {
  color: var(--blue);
  font-weight: 700;
}

.faq-list {
  display: grid;
  gap: 14px;
}

.faq-item {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 22px;
}

.faq-item h3 {
  margin: 0 0 8px;
  font-size: 17px;
}

.faq-item p {
  color: var(--muted);
  margin: 0;
}

.lead {
  color: var(--muted);
  margin: 10px 0 0;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
  max-width: 780px;
  margin-top: 44px;
  padding-top: 28px;
  border-top: 1px solid rgba(255, 255, 255, 0.18);
}

.stat strong {
  display: block;
  font-size: 34px;
  line-height: 1.15;
  color: var(--gold);
}

.stat span {
  color: rgba(255, 255, 255, 0.84);
  font-size: 14px;
}

.about-preview p {
  color: var(--muted);
  font-size: 17px;
  max-width: 840px;
  margin: 0 0 26px;
}

.product-grid,
.advantage-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px;
}

.case-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 20px;
}

.product-card,
.advantage-card,
.case-card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: 0 4px 14px rgba(27, 37, 52, 0.04);
}

.icon-box {
  width: 52px;
  height: 52px;
  border-radius: var(--radius);
  background: var(--blue);
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  font-weight: 800;
  margin-bottom: 16px;
}

.product-card h3,
.advantage-card h3,
.case-card h3 {
  margin: 0 0 8px;
  font-size: 20px;
}

.product-tagline {
  color: var(--blue);
  font-weight: 700;
  margin: 0 0 14px;
}

.feature-list {
  list-style: none;
  padding: 0;
  margin: 0 0 18px;
  display: grid;
  gap: 8px;
}

.feature-list li {
  position: relative;
  padding-left: 22px;
  color: var(--muted);
}

.feature-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--gold);
  font-weight: 800;
}

.advantage-card p,
.case-card p {
  color: var(--muted);
  margin: 0;
}

.case-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.case-tag {
  background: var(--blue-light);
  color: var(--blue);
  border-radius: 999px;
  padding: 4px 10px;
  font-size: 13px;
  font-weight: 700;
  white-space: nowrap;
}

.case-meta {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}

.case-meta span {
  display: flex;
  flex-direction: column;
}

.case-meta strong {
  font-size: 22px;
  line-height: 1.2;
  color: var(--blue);
}

.case-meta em {
  font-style: normal;
  color: var(--muted);
  font-size: 13px;
}

.page-main {
  padding: 40px 0 72px;
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  list-style: none;
  margin: 0 0 26px;
  padding: 0;
  color: var(--muted);
  font-size: 14px;
}

.breadcrumb li + li::before {
  content: "/";
  margin-right: 6px;
  color: var(--line);
}

.article-header {
  margin-bottom: 26px;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  color: var(--muted);
  font-size: 14px;
  margin-bottom: 14px;
}

.article-header h1 {
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1.25;
  margin: 0 0 14px;
}

.article-summary {
  color: var(--muted);
  font-size: 17px;
  margin: 0;
}

.article-cover {
  display: block;
  width: 100%;
  border-radius: var(--radius);
  margin: 0 0 30px;
  border: 1px solid var(--line);
}

.article-body {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 34px 38px;
  box-shadow: 0 4px 14px rgba(27, 37, 52, 0.04);
}

.article-body section {
  margin-bottom: 26px;
}

.article-body h2 {
  font-size: 24px;
  line-height: 1.35;
  margin: 0 0 12px;
}

.article-body h3 {
  font-size: 18px;
  margin: 18px 0 8px;
}

.article-body p {
  margin: 0 0 14px;
  color: #33404F;
}

.article-body ul,
.article-body ol {
  padding-left: 22px;
}

.article-body blockquote {
  margin: 18px 0;
  padding: 12px 18px;
  border-left: 4px solid var(--gold);
  background: var(--blue-light);
  color: #33404F;
}

.article-body code {
  background: var(--blue-light);
  border-radius: 4px;
  padding: 2px 6px;
  font-family: Consolas, monospace;
}

.article-body img {
  border-radius: var(--radius);
  margin: 12px 0;
}

.howto-steps,
.article-faq {
  margin-top: 30px;
}

.howto-steps ol {
  counter-reset: step;
  list-style: none;
  padding: 0;
  display: grid;
  gap: 12px;
}

.howto-steps li {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 20px;
  counter-increment: step;
}

.howto-steps li h3::before {
  content: "步骤 " counter(step) "：";
  color: var(--gold);
  margin-right: 4px;
}

.howto-steps h3 {
  margin: 0 0 6px;
  font-size: 17px;
}

.howto-steps p {
  margin: 0;
  color: var(--muted);
}

.author-box {
  display: flex;
  gap: 16px;
  align-items: center;
  background: var(--blue-light);
  border-radius: var(--radius);
  padding: 20px 22px;
  margin-top: 30px;
}

.author-avatar {
  width: 48px;
  height: 48px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--blue);
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 20px;
}

.author-box h3 {
  margin: 0 0 4px;
  font-size: 17px;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 24px;
}

.tag-list a {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 5px 12px;
  font-size: 13px;
  color: var(--blue);
}

.citation-box {
  margin-top: 30px;
  background: var(--white);
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  padding: 20px 22px;
}

.citation-box h2 {
  font-size: 17px;
  margin: 0 0 8px;
}

.citation-box p {
  color: var(--muted);
  margin: 6px 0;
  font-size: 14px;
}

.first-published {
  font-weight: 700;
  color: var(--blue) !important;
}

.list-header {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 30px 32px;
  margin-bottom: 28px;
}

.list-header h1 {
  font-size: 32px;
  margin: 0 0 10px;
}

.list-header p {
  color: var(--muted);
  margin: 0;
}

.concept-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  padding: 0;
  margin: 16px 0 0;
}

.concept-list li {
  background: var(--blue-light);
  color: var(--blue);
  border-radius: 999px;
  padding: 5px 12px;
  font-size: 13px;
  font-weight: 600;
}

.author-header {
  display: flex;
  gap: 24px;
  align-items: flex-start;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 30px 32px;
  margin-bottom: 28px;
}

.author-avatar-lg {
  width: 72px;
  height: 72px;
  font-size: 30px;
}

.author-header h1 {
  margin: 0 0 8px;
  font-size: 30px;
}

.author-header p {
  color: var(--muted);
  margin: 0 0 12px;
}

.author-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  color: var(--blue);
  font-weight: 700;
  margin-bottom: 8px;
}

.notfound {
  text-align: center;
  padding: 60px 0;
}

.notfound-code {
  font-size: 80px;
  font-weight: 800;
  color: var(--blue-light);
  line-height: 1;
  margin: 0;
}

.notfound h1 {
  margin: 8px 0;
}

.notfound p {
  color: var(--muted);
  margin: 0 0 24px;
}

.site-footer {
  background: #122F5C;
  color: rgba(255, 255, 255, 0.82);
}

.footer-inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 40px;
  padding: 48px 0 36px;
}

.footer-brand-link {
  color: var(--white);
  gap: 10px;
  margin-bottom: 12px;
}

.footer-brand-link img {
  height: 34px;
  width: auto;
}

.footer-brand p {
  max-width: 420px;
  margin: 0;
}

.footer-links h4,
.footer-contact h4 {
  color: var(--white);
  margin: 0 0 12px;
}

.footer-links ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-links a,
.footer-contact a {
  color: rgba(255, 255, 255, 0.82);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.18);
  padding: 18px 0;
  font-size: 13px;
}

.footer-bottom .container {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.footer-legal {
  width: 100%;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px 20px;
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid rgba(255, 255, 255, 0.18);
}

.footer-legal a,
.footer-legal span {
  color: rgba(255, 255, 255, 0.82);
}

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

.contact-section {
  background: #163F7A;
  color: var(--white);
  margin-top: 40px;
}

.contact-inner {
  max-width: 820px;
  text-align: center;
}

.contact-eyebrow {
  color: var(--gold);
}

.contact-eyebrow::before {
  background: var(--gold);
}

.contact-section h2 {
  font-size: 34px;
  line-height: 1.3;
  margin: 20px 0 12px;
  color: var(--white);
}

.contact-phone {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  margin: 10px 0 8px;
  font-size: 44px;
  font-weight: 700;
  color: var(--white);
}

.contact-phone svg {
  width: 34px;
  height: 34px;
  color: var(--gold);
}

.contact-note {
  font-size: 15px;
  color: rgba(255, 255, 255, 0.72);
  margin: 0;
}

@media (max-width: 860px) {
  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--white);
    border-bottom: 1px solid var(--line);
    padding: 16px 24px 24px;
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
    display: none;
  }

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

  .nav-list {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
    width: 100%;
  }

  .dropdown {
    position: static;
    box-shadow: none;
    border: 0;
    padding: 8px 0 0 12px;
    display: none;
  }

  .has-dropdown.open .dropdown {
    display: block;
  }

  .hero {
    padding: 64px 0 60px;
  }

  .section {
    padding: 52px 0;
  }

  .article-body {
    padding: 24px 20px;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 28px;
  }
}

@media (max-width: 560px) {
  .container,
  .narrow {
    width: calc(100% - 32px);
  }

  .article-grid,
  .topic-grid {
    grid-template-columns: 1fr;
  }

  .author-header {
    flex-direction: column;
    gap: 14px;
  }

  .hero-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .contact-section h2 {
    font-size: 28px;
  }

  .contact-phone {
    font-size: 30px;
  }
}