body { margin:0; font-family:Arial; background:#fff8dc; }
.ad-left, .ad-right { width:10%; position:fixed; top:0; bottom:0; background:#fff8dc; z-index:1; }
.ad-left { left:0; } .ad-right { right:0; }
main, .header-container { width:79%; margin:0 auto; }

.header-top { display:flex; justify-content:space-between; align-items:center; padding:10px 0; }
.logo { font-size:22px; font-weight:bold; cursor:pointer; }
.search input { padding:6px; width:200px; }
.nav { display:flex; gap:20px; background:#fff; padding:10px; position:relative; z-index:10; }
.nav > div { cursor:pointer; }
.dropdown { position:relative; }
.dropdown-content { display:none; position:absolute; top:100%; left:0; background:#fff; padding:10px; width:320px; flex-direction:column; box-shadow:0 2px 8px rgba(0,0,0,0.2); }
.dropdown:hover .dropdown-content, .dropdown-content:hover { display:flex; }
.dropdown-group { margin-bottom:8px; }
.dropdown-row { display:flex; flex-wrap:wrap; gap:10px; }
.dropdown-content span { cursor:pointer; padding:4px 6px; display:inline-block; }
.dropdown-content span:hover { background-color:#f0f0f0; border-radius:4px; }

/* 电影网格 */
.movie-grid { display:grid; grid-template-columns:repeat(6,1fr); gap:12px; width:100%; margin-top:10px; }
.movie-card { background:#fff; border-radius:6px; overflow:hidden; cursor:pointer; display:flex; flex-direction:column; height:auto; }
.movie-card img { width:100%; height:auto; object-fit:cover; display:block; }
.movie-card p { font-size:14px; padding:6px; margin:0; text-align:center; height:40px; overflow:hidden; }

/* ===== 顶部固定（关键需求4）===== */
.header-container{
  position: sticky;
  top: 0;
  z-index: 999;
  background: #fff8dc;
}

/* 导航鼠标手型 */
.nav > div {
  cursor: pointer;
}

/* dropdown 子项手型 */
.dropdown-content span {
  cursor: pointer;
}

/* hover 高亮 */
.dropdown-content span:hover {
  background:#eee;
}

/* ============================= */
/* 导航栏系统 */
/* ============================= */

.nav {
  display: flex;
  gap: 20px;
  padding: 10px;
  background: #a5d6a7;
  font-weight: bold;
}

.nav a {
  text-decoration: none;
  color: black;
}

/* ============================= */
/* 地区下拉 */
/* ============================= */

.dropdown {
  position: relative;
  cursor: pointer;
}

.dropdown-menu {
  display: none;
  position: absolute;
  top: 30px;
  left: 0;
  background: white;
  border: 1px solid #ccc;
  max-height: 300px;
  overflow-y: auto;
  width: 200px;
  z-index: 1000;
}

.dropdown-menu a {
  display: block;
  padding: 6px 10px;
}

.dropdown-menu a:hover {
  background: #eee;
}

/* 广告系统 */

.ad-box {
  background: #dcedc8;
  text-align: center;
  padding: 10px;
  margin: 10px 0;
}

.ad-inline {
  grid-column: span 6;
}

/* 胆小勿入 */

h1 {
  font-size: 28px;
}

#niche-list {
  margin-top: 20px;
}