* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: #f7f8fa;
  color: #111;
}

.hero {
  background: linear-gradient(135deg, #111827, #1f2933);
  color: white;
  padding: 60px 20px;
  text-align: center;
}

.hero h1 { margin: 0 0 10px; font-size: 32px; }
.tagline { font-size: 18px; margin: 0 0 10px; }
.hero-desc { 
  font-size: 16px; 
  opacity: .85; 
  margin-top: 16px;
  padding: 10px 20px;
  background: rgba(255,255,255,0.1);
  border-radius: 8px;
  display: inline-block;
}
.hero p { opacity: .9; }

.intro {
  max-width: 900px;
  margin: 40px auto;
  padding: 0 20px;
  font-size: 18px;
  line-height: 1.8;
  text-align: center;
}

.intro-box {
  background: white;
  padding: 24px 30px;
  border-radius: 12px;
  box-shadow: 0 4px 15px rgba(0,0,0,0.06);
}

.intro-box p {
  margin: 0;
}

/* 团队背景区域 */
.team-bg {
  max-width: 1100px;
  margin: 0 auto 50px;
  padding: 0 20px;
}

.team-bg h2 {
  text-align: center;
  margin-bottom: 30px;
}

.team-highlights {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}

.highlight-item {
  background: white;
  border-radius: 12px;
  padding: 20px;
  display: flex;
  gap: 14px;
  align-items: flex-start;
  box-shadow: 0 4px 15px rgba(0,0,0,0.06);
  border-left: 3px solid #2563eb;
}

.highlight-icon {
  font-size: 24px;
  flex-shrink: 0;
}

.highlight-content h3 {
  margin: 0 0 6px;
  font-size: 16px;
  color: #111;
}

.highlight-content p {
  margin: 0;
  font-size: 14px;
  color: #555;
  line-height: 1.5;
}

.projects {
  max-width: 1200px;
  margin: 0 auto 60px;
  padding: 0 20px;
}

.projects h2 {
  text-align: center;
  margin-bottom: 16px;
}

.projects-claim {
  text-align: center;
  font-size: 15px;
  color: #2563eb;
  margin-bottom: 30px;
  padding: 12px 20px;
  background: #eef4ff;
  border-radius: 8px;
  display: inline-block;
  width: 100%;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.card {
  background: white;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 12px 30px rgba(0,0,0,0.08);
  display: flex;
  flex-direction: column;
}

.card img {
  width: 100%;
  height: 180px;
  object-fit: cover;
}

.card-body {
  padding: 16px 18px 20px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.card-tag {
  display: inline-block;
  background: #f0f4f8;
  color: #475569;
  font-size: 12px;
  padding: 4px 10px;
  border-radius: 20px;
  margin-bottom: 10px;
}

.card-body h3 {
  margin: 0 0 12px;
  font-size: 18px;
}

.card-tech {
  flex: 1;
}

.card-tech p {
  margin: 0 0 8px;
  font-size: 14px;
  line-height: 1.6;
  color: #333;
}

.card-tech .what {
  color: #111;
  font-weight: 500;
}

.card-tech .scope {
  color: #444;
}

.card-tech .level {
  color: #666;
  font-size: 13px;
}

.card-body a {
  margin-top: 12px;
  align-self: flex-start;
  text-decoration: none;
  color: #2563eb;
  font-size: 14px;
}

.card-body a:hover {
  text-decoration: underline;
}

.card-links {
  display: flex;
  gap: 16px;
  margin-top: 12px;
}

.card-links a {
  margin-top: 0;
}

/* 合作方式区域 */
.cooperation {
  max-width: 900px;
  margin: 0 auto 60px;
  padding: 0 20px;
}

.cooperation h2 {
  text-align: center;
  margin-bottom: 30px;
}

.coop-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  margin-bottom: 30px;
}

.coop-item {
  background: white;
  border-radius: 12px;
  padding: 24px 20px;
  text-align: center;
  box-shadow: 0 4px 15px rgba(0,0,0,0.06);
}

.coop-icon {
  font-size: 32px;
  margin-bottom: 12px;
}

.coop-item h3 {
  margin: 0 0 8px;
  font-size: 16px;
}

.coop-item p {
  margin: 0;
  font-size: 14px;
  color: #666;
}

.payment-note {
  background: #f8fafc;
  border-radius: 12px;
  padding: 24px;
  text-align: center;
}

.payment-note > p {
  margin: 0 0 16px;
  font-size: 15px;
  color: #333;
}

.payment-flow {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.payment-flow span {
  background: white;
  padding: 8px 16px;
  border-radius: 6px;
  font-size: 14px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}

.payment-flow .arrow {
  background: none;
  box-shadow: none;
  padding: 0;
  color: #999;
}

/* 联系方式区域 */
.contact {
  max-width: 600px;
  margin: 0 auto 60px;
  padding: 40px 20px;
  text-align: center;
  background: linear-gradient(135deg, #111827, #1f2933);
  border-radius: 16px;
  color: white;
}

.contact h2 {
  margin: 0 0 20px;
}

.contact-email {
  font-size: 20px;
  margin: 0 0 12px;
}

.contact-note {
  font-size: 14px;
  opacity: .8;
  margin: 0;
}

footer {
  text-align: center;
  padding: 40px 10px;
  color: #666;
}

/* 响应式调整 */
@media (max-width: 600px) {
  .hero h1 { font-size: 24px; }
  .hero-desc { font-size: 14px; padding: 8px 16px; }
  .intro { font-size: 16px; }
  .team-highlights { grid-template-columns: 1fr; }
  .highlight-item { flex-direction: column; text-align: center; }
  .payment-flow { flex-direction: column; gap: 8px; }
  .payment-flow .arrow { transform: rotate(90deg); }
}