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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
  line-height: 1.6;
  color: #1a1a1a;
  background: #f8fbff;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
.main-header {
  background: #fff;
  box-shadow: 0 2px 10px rgba(66,133,244,.1);
  position: sticky;
  top: 0;
  z-index: 100;
  padding: 15px 0;
}

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

.logo {
  height: 45px;
  width: auto;
}

.main-header nav {
  display: flex;
  gap: 35px;
}

.main-header nav a {
  color: #2c5aa0;
  text-decoration: none;
  font-weight: 500;
  transition: color .3s;
}

.main-header nav a:hover {
  color: #4285f4;
}

/* Hero Banner */
.hero-banner {
  background: linear-gradient(135deg, #4285f4 0%, #2c5aa0 50%, #1e3a8a 100%);
  color: #fff;
  padding: 120px 20px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero-banner::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 120"><path fill="%23ffffff" fill-opacity="0.05" d="M0,0 L1200,0 L1200,50 Q900,100 600,50 T0,50 Z"/></svg>') repeat-x bottom;
  opacity: 0.6;
}

.banner-content {
  position: relative;
  z-index: 1;
  max-width: 900px;
  margin: 0 auto;
}

.hero-banner h1 {
  font-size: 48px;
  font-weight: 700;
  margin-bottom: 20px;
  text-shadow: 0 2px 8px rgba(0,0,0,.2);
  letter-spacing: 1px;
}

.hero-subtitle {
  font-size: 26px;
  margin-bottom: 15px;
  font-weight: 600;
  opacity: 0.95;
}

.hero-desc {
  font-size: 16px;
  line-height: 1.8;
  margin-bottom: 40px;
  opacity: 0.9;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.cta-buttons {
  display: flex;
  gap: 20px;
  justify-content: center;
  margin-bottom: 30px;
}

.btn-primary, .btn-secondary {
  padding: 18px 45px;
  font-size: 18px;
  font-weight: 600;
  border: none;
  border-radius: 50px;
  cursor: pointer;
  transition: all .3s;
}

.btn-primary {
  background: #fff;
  color: #2c5aa0;
  box-shadow: 0 8px 20px rgba(0,0,0,.2);
  animation: pulse 2s infinite;
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 30px rgba(0,0,0,.3);
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

.btn-secondary {
  background: rgba(255,255,255,.15);
  color: #fff;
  border: 2px solid #fff;
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: rgba(255,255,255,.25);
  transform: translateY(-3px);
}

.trust-badges {
  display: flex;
  gap: 30px;
  justify-content: center;
  flex-wrap: wrap;
}

.trust-badges span {
  font-size: 15px;
  font-weight: 500;
  opacity: 0.9;
}

/* Quick Nav */
.quick-nav {
  background: #e3f2fd;
  padding: 15px 0;
  text-align: center;
  position: sticky;
  top: 75px;
  z-index: 99;
  display: flex;
  justify-content: center;
  gap: 40px;
  box-shadow: 0 2px 8px rgba(66,133,244,.1);
}

.quick-nav a {
  color: #2c5aa0;
  text-decoration: none;
  font-weight: 500;
  transition: color .3s;
}

.quick-nav a:hover {
  color: #4285f4;
}

/* Sections */
.section {
  padding: 80px 20px;
}

.section h2 {
  text-align: center;
  font-size: 36px;
  color: #2c5aa0;
  margin-bottom: 15px;
  font-weight: 700;
}

.section-intro {
  text-align: center;
  color: #666;
  font-size: 16px;
  margin-bottom: 50px;
}

/* Features */
.features-section {
  background: #fff;
}

.feature-showcase {
  margin: 0 auto 50px;
  max-width: 1000px;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 8px 30px rgba(66,133,244,.15);
}

.showcase-img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform .5s;
}

.feature-showcase:hover .showcase-img {
  transform: scale(1.05);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 30px;
}

.feature-card {
  background: #f0f7ff;
  padding: 35px 25px;
  border-radius: 12px;
  border-left: 4px solid #4285f4;
  transition: transform .3s;
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 20px rgba(66,133,244,.15);
}

.feature-icon {
  font-size: 48px;
  margin-bottom: 15px;
}

.feature-card h3 {
  color: #2c5aa0;
  margin-bottom: 12px;
  font-size: 20px;
}

.feature-card p {
  color: #555;
  line-height: 1.7;
}

/* Steps */
.steps-section {
  background: linear-gradient(to bottom, #fff, #f0f7ff);
}

.steps-wrapper {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  margin-top: 50px;
}

.step-item {
  background: #fff;
  padding: 35px 30px;
  border-radius: 12px;
  box-shadow: 0 4px 15px rgba(66,133,244,.1);
  flex: 1;
  min-width: 250px;
  max-width: 300px;
  text-align: center;
}

.step-num {
  background: #4285f4;
  color: #fff;
  width: 80px;
  height: 80px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  font-size: 18px;
  font-weight: 700;
}

.step-item h3 {
  color: #2c5aa0;
  margin-bottom: 12px;
  font-size: 20px;
}

.step-arrow {
  font-size: 36px;
  color: #4285f4;
  font-weight: 700;
}

/* Tech */
.tech-section {
  background: #fff;
}

.tech-content {
  display: flex;
  gap: 50px;
  align-items: center;
  margin-top: 40px;
}

.tech-list {
  flex: 1;
}

.tech-item {
  background: #f0f7ff;
  padding: 20px;
  margin-bottom: 15px;
  border-radius: 8px;
  border-left: 3px solid #4285f4;
}

.tech-item strong {
  color: #2c5aa0;
  display: block;
  margin-bottom: 5px;
}

.tech-visual {
  flex-shrink: 0;
}

.tech-visual img {
  max-width: 500px;
  width: 100%;
  height: auto;
  border-radius: 12px;
  box-shadow: 0 8px 25px rgba(66,133,244,.2);
  transition: transform .3s;
}

.tech-visual:hover img {
  transform: translateY(-5px);
}

/* Table */
.table-section {
  background: #f0f7ff;
}

.table-desc {
  text-align: center;
  color: #555;
  margin-bottom: 40px;
  line-height: 1.8;
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
}

.table-wrapper {
  overflow-x: auto;
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 4px 15px rgba(66,133,244,.1);
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 700px;
}

th, td {
  padding: 18px;
  text-align: center;
  border-bottom: 1px solid #e3f2fd;
}

th {
  background: #2c5aa0;
  color: #fff;
  font-weight: 600;
}

.highlight-row {
  background: #e3f2fd;
  font-weight: 600;
}

.highlight-row td {
  color: #2c5aa0;
}

.table-note {
  text-align: center;
  color: #777;
  font-size: 14px;
  margin-top: 15px;
}

/* Cases */
.cases-section {
  background: #fff;
}

.detection-types {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
  margin-bottom: 60px;
}

.detection-item {
  position: relative;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 6px 20px rgba(66,133,244,.12);
  transition: all .3s;
}

.detection-item:hover {
  transform: translateY(-8px);
  box-shadow: 0 12px 35px rgba(66,133,244,.2);
}

.detection-item img {
  width: 100%;
  height: auto;
  display: block;
}

.detection-label {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(to top, rgba(44,90,160,.95), rgba(44,90,160,.7));
  color: #fff;
  padding: 15px;
  text-align: center;
  font-weight: 600;
  font-size: 16px;
}

.cases-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 25px;
  margin-top: 40px;
}

.case-card {
  background: linear-gradient(135deg, #e3f2fd, #bbdefb);
  padding: 30px;
  border-radius: 12px;
  border: 2px solid #4285f4;
}

.case-card h3 {
  color: #2c5aa0;
  margin-bottom: 12px;
  font-size: 18px;
}

.case-card p {
  color: #444;
  line-height: 1.7;
}

/* FAQ */
.faq-section {
  background: #f0f7ff;
}

.faq-list {
  max-width: 900px;
  margin: 40px auto 0;
}

.faq-item {
  background: #fff;
  padding: 25px;
  margin-bottom: 20px;
  border-radius: 10px;
  box-shadow: 0 2px 10px rgba(66,133,244,.08);
}

.faq-item h3 {
  color: #2c5aa0;
  margin-bottom: 10px;
  font-size: 18px;
}

.faq-item p {
  color: #555;
  line-height: 1.8;
}

/* Partners */
.partners-section {
  background: #f0f7ff;
}

.partners-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 40px;
  align-items: center;
  justify-items: center;
  margin-top: 50px;
}

.partner-logo {
  background: #fff;
  padding: 20px;
  border-radius: 12px;
  box-shadow: 0 4px 15px rgba(66,133,244,.08);
  transition: all .3s;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100px;
}

.partner-logo:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 25px rgba(66,133,244,.15);
}

.partner-logo img {
  max-width: 100%;
  height: auto;
  filter: grayscale(30%);
  transition: filter .3s;
}

.partner-logo:hover img {
  filter: grayscale(0%);
}

/* Stats */
.stats-section {
  background: linear-gradient(135deg, #4285f4, #2c5aa0);
  color: #fff;
}

.stats-section h2 {
  color: #fff;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 40px;
  margin-top: 50px;
}

.stat-card {
  text-align: center;
}

.stat-num {
  font-size: 48px;
  font-weight: 700;
  margin-bottom: 10px;
  text-shadow: 0 2px 4px rgba(0,0,0,.2);
}

.stat-label {
  font-size: 16px;
  opacity: 0.9;
}

/* Guide */
.guide-section {
  background: #fff;
}

.guide-content {
  max-width: 900px;
  margin: 40px auto 0;
}

.guide-item {
  background: #fff3cd;
  border-left: 4px solid #ffc107;
  padding: 20px;
  margin-bottom: 15px;
  border-radius: 8px;
}

.guide-item strong {
  color: #e65100;
  margin-right: 8px;
}

/* Types */
.types-section {
  background: #f0f7ff;
}

.types-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 15px;
  justify-content: center;
  margin-top: 40px;
}

.type-tag {
  background: #fff;
  color: #2c5aa0;
  padding: 12px 24px;
  border-radius: 25px;
  border: 2px solid #4285f4;
  font-weight: 500;
  transition: all .3s;
}

.type-tag:hover {
  background: #4285f4;
  color: #fff;
  transform: scale(1.05);
}

/* CTA Section */
.cta-section {
  background: linear-gradient(135deg, #2c5aa0, #1e3a8a);
  color: #fff;
  text-align: center;
}

.cta-section h2 {
  color: #fff;
}

.cta-section p {
  font-size: 18px;
  margin-bottom: 40px;
  opacity: 0.9;
}

/* Action Tools */
.action-tools {
  position: fixed;
  right: 20px;
  bottom: 80px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 100;
}

.tool-btn {
  background: #4285f4;
  color: #fff;
  border: none;
  width: 55px;
  height: 55px;
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(66,133,244,.3);
  transition: all .3s;
  font-size: 14px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.tool-btn:hover {
  background: #2c5aa0;
  transform: scale(1.1);
}

#backTop {
  font-size: 24px;
}

/* Footer */
.main-footer {
  background: #1e3a8a;
  color: #fff;
  padding: 40px 20px;
  text-align: center;
}

.footer-content {
  max-width: 900px;
  margin: 0 auto;
}

.footer-info {
  margin-bottom: 25px;
}

.footer-info p {
  margin-bottom: 8px;
  opacity: 0.9;
}

.footer-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 15px;
  justify-content: center;
}

.footer-actions button {
  background: rgba(255,255,255,.1);
  color: #fff;
  border: 1px solid rgba(255,255,255,.3);
  padding: 8px 20px;
  border-radius: 20px;
  cursor: pointer;
  transition: all .3s;
}

.footer-actions button:hover {
  background: rgba(255,255,255,.2);
}

/* Responsive */
@media (max-width: 768px) {
  .hero-banner h1 { font-size: 32px; }
  .hero-subtitle { font-size: 20px; }
  .hero-desc { font-size: 15px; }
  .cta-buttons { flex-direction: column; }
  .btn-primary, .btn-secondary { width: 100%; }
  .section h2 { font-size: 28px; }
  .tech-content { flex-direction: column; }
  .tech-visual img { max-width: 100%; }
  .step-arrow { display: none; }
  .main-header nav { display: none; }
  .quick-nav { display: none; }
  .stat-num { font-size: 36px; }
  .partners-grid { grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: 20px; }
  .detection-types { grid-template-columns: 1fr; }
}