body {
  margin: 0;
  font-family: 'Segoe UI', 'PingFang SC', sans-serif;
  background-color: #0f1116;
  color: #fff;
}

/* ===== 顶部导航栏 ===== */
.navbar {
  background: #12141c;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px 40px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.5);
  position: sticky;
  top: 0;
  z-index: 1000;
}
.navbar .logo {
  font-size: 1.3rem;
  font-weight: bold;
  color: #3ea6ff;
}
.navbar ul {
  list-style: none;
  display: flex;
  gap: 30px;
  margin: 0;
  padding: 0;
}
.navbar li a {
  color: #fff;
  text-decoration: none;
  transition: 0.3s;
  font-weight: 500;
}
.navbar li a:hover {
  color: #3ea6ff;
}
.navbar .active a {
  color: #3ea6ff;
}

/* ===== 搜索栏 ===== */
.search-section {
  text-align: center;
  margin: 50px 0 30px;
}
.search-box {
  display: inline-flex;
  align-items: center;
  background: #1c1f26;
  border-radius: 50px;
  overflow: hidden;
  box-shadow: 0 0 10px rgba(0,0,0,0.5);
}
.engine-select {
  background: #2a2f3a;
  border: none;
  color: #fff;
  padding: 12px 15px;
  font-size: 0.95rem;
  outline: none;
  cursor: pointer;
}
.search-input {
  border: none;
  padding: 12px 20px;
  width: 240px;
  background: transparent;
  color: #fff;
  font-size: 1rem;
  outline: none;
}
.search-btn {
  background: #3ea6ff;
  border: none;
  color: #fff;
  padding: 12px 20px;
  cursor: pointer;
  font-size: 1rem;
  transition: 0.3s;
}
.search-btn:hover {
  background: #2e8ad8;
}

/* ===== 卡片布局 ===== */
.card-container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 20px;
  max-width: 1100px;
  margin: 0 auto;
  padding: 20px;
}
.card {
  background: linear-gradient(135deg, #4a90e2, #9013fe);
  padding: 25px 15px;
  text-align: center;
  font-size: 1rem;
  border-radius: 15px;
  cursor: pointer;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.card:hover {
  transform: translateY(-6px);
  box-shadow: 0 8px 20px rgba(0,0,0,0.4);
}

/* 不同渐变色 */
.card:nth-child(6n+1){background: linear-gradient(135deg,#00c6ff,#0072ff);}
.card:nth-child(6n+2){background: linear-gradient(135deg,#ff416c,#ff4b2b);}
.card:nth-child(6n+3){background: linear-gradient(135deg,#43e97b,#38f9d7);}
.card:nth-child(6n+4){background: linear-gradient(135deg,#fa709a,#fee140);}
.card:nth-child(6n+5){background: linear-gradient(135deg,#a18cd1,#fbc2eb);}
.card:nth-child(6n+6){background: linear-gradient(135deg,#f7971e,#ffd200);}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
  .navbar {flex-direction: column; padding: 10px 15px;}
  .navbar ul {gap: 15px;}
  .search-input {width: 160px;}
  .card-container {grid-template-columns: repeat(2, 1fr); gap: 15px;}
  .card {font-size: 0.95rem; padding: 20px;}
}