/* 云端科技官网 - 默认模板组样式 */
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: "PingFang SC", "Microsoft YaHei", sans-serif; background: #f4f6f9; color: #333; }
a { text-decoration: none; color: inherit; }
.top-nav { background: #1f2d3d; color: #fff; position: sticky; top: 0; z-index: 100; box-shadow: 0 2px 8px rgba(0,0,0,.15); }
.top-nav .nav-inner { max-width: 1100px; margin: 0 auto; padding: 0 20px; height: 60px; display: flex; align-items: center; gap: 28px; }
.top-nav .logo { font-size: 20px; font-weight: 700; color: #fff; }
.top-nav .logo span { color: #4ea1ff; }
.top-nav .nav-links { display: flex; gap: 22px; }
.top-nav .nav-links a { color: #c8d3e0; font-size: 14px; padding: 6px 2px; border-bottom: 2px solid transparent; }
.top-nav .nav-links a:hover { color: #fff; border-bottom-color: #4ea1ff; }
.top-nav .nav-links a { white-space: nowrap; }
.top-nav .nav-toggle { display: none; background: none; border: none; color: #fff; font-size: 22px; cursor: pointer; padding: 0 6px; line-height: 1; }
.nav-drop { display: none; }
.top-nav .nav-user { margin-left: auto; font-size: 13px; color: #c8d3e0; }
.top-nav .nav-user a { color: #4ea1ff; margin-left: 10px; }
.page { max-width: 1100px; margin: 24px auto; padding: 0 20px; }
.banner { background: linear-gradient(135deg, #1f2d3d 0%, #2f5f8f 100%); color: #fff; border-radius: 12px; padding: 56px 40px; margin-bottom: 28px; }
.banner h1 { font-size: 32px; margin-bottom: 12px; }
.banner p { color: #b8c9dc; font-size: 15px; max-width: 640px; line-height: 1.7; }
.banner .btn { display: inline-block; margin-top: 22px; background: #4ea1ff; color: #fff; padding: 10px 26px; border-radius: 6px; font-size: 14px; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 18px; margin-bottom: 28px; }
.card { background: #fff; border-radius: 10px; padding: 20px; box-shadow: 0 1px 4px rgba(0,0,0,.06); transition: transform .15s, box-shadow .15s; }
.card:hover { transform: translateY(-3px); box-shadow: 0 6px 18px rgba(0,0,0,.1); }
.card h3 { font-size: 16px; margin-bottom: 8px; color: #1f2d3d; line-height: 1.5; }
.card .tag { display: inline-block; background: #fff3e0; color: #e6a23c; font-size: 12px; border-radius: 3px; padding: 1px 6px; margin-right: 6px; vertical-align: 2px; }
.card p { color: #8899aa; font-size: 13px; line-height: 1.7; }
.card .meta { margin-top: 12px; color: #aab6c2; font-size: 12px; display: flex; justify-content: space-between; }
.section-title { font-size: 20px; color: #1f2d3d; margin: 26px 0 16px; padding-left: 10px; border-left: 4px solid #4ea1ff; }
.list-card { background: #fff; border-radius: 10px; padding: 4px 22px; box-shadow: 0 1px 4px rgba(0,0,0,.06); }
.list-item { padding: 16px 0; border-bottom: 1px solid #f0f2f5; display: flex; justify-content: space-between; align-items: center; gap: 16px; }
.list-item:last-child { border-bottom: none; }
.list-item a.title { color: #333; font-size: 15px; }
.list-item a.title:hover { color: #4ea1ff; }
.list-item .time { color: #aab6c2; font-size: 13px; white-space: nowrap; }
.article { background: #fff; border-radius: 10px; padding: 32px; box-shadow: 0 1px 4px rgba(0,0,0,.06); }
.article h1 { font-size: 26px; color: #1f2d3d; margin-bottom: 10px; }
.article .crumb { color: #4ea1ff; font-size: 13px; margin-bottom: 8px; }
.article .meta { color: #aab6c2; font-size: 13px; margin-bottom: 24px; padding-bottom: 16px; border-bottom: 1px solid #f0f2f5; }
.article .content { line-height: 1.9; font-size: 15px; color: #444; word-break: break-word; }
.article .content img { max-width: 100%; border-radius: 6px; }
.search-box { display: flex; gap: 10px; margin-bottom: 20px; }
.search-box input { flex: 1; padding: 12px 14px; border: 1px solid #dde3ea; border-radius: 8px; font-size: 14px; outline: none; }
.search-box input:focus { border-color: #4ea1ff; }
.search-box button { padding: 12px 28px; background: #1f2d3d; color: #fff; border: none; border-radius: 8px; cursor: pointer; }
.login-wrap { max-width: 420px; margin: 60px auto; background: #fff; border-radius: 12px; padding: 36px; box-shadow: 0 4px 16px rgba(0,0,0,.08); }
.login-wrap h2 { text-align: center; color: #1f2d3d; margin-bottom: 24px; }
.login-wrap input { width: 100%; padding: 11px 14px; border: 1px solid #dde3ea; border-radius: 8px; margin-bottom: 14px; font-size: 14px; outline: none; }
.login-wrap input:focus { border-color: #4ea1ff; }
.login-wrap button { width: 100%; padding: 11px; background: #1f2d3d; color: #fff; border: none; border-radius: 8px; font-size: 15px; cursor: pointer; }
.login-wrap .err { color: #e05555; text-align: center; margin-bottom: 12px; }
.login-wrap .err:empty { display: none; }
.footer { background: #1f2d3d; color: #8b9bb0; text-align: center; padding: 26px 0; margin-top: 40px; font-size: 13px; }
.footer a { color: #4ea1ff; }
.empty-tip { text-align: center; color: #aab6c2; padding: 48px 0; }
.pager { display: flex; justify-content: center; gap: 8px; margin: 22px 0; }
.pager a, .pager span { padding: 7px 14px; border-radius: 6px; background: #fff; color: #555; font-size: 13px; }
.pager a:hover { background: #4ea1ff; color: #fff; }
@media (max-width: 720px) {
  .banner { padding: 36px 22px; }
  .banner h1 { font-size: 24px; }
  .grid { grid-template-columns: 1fr; }
  /* 移动端导航: 折叠栏目链接, 用按钮展开 */
  .top-nav .nav-links, .top-nav .nav-user { display: none; }
  .top-nav .nav-toggle { display: block; }
  .nav-drop { position: absolute; top: 60px; left: 0; right: 0; background: #1f2d3d; flex-direction: column; padding: 8px 20px 14px; z-index: 99; box-shadow: 0 6px 12px rgba(0,0,0,.2); }
  .nav-drop.open { display: flex; }
  .nav-drop > a { color: #c8d3e0; font-size: 14px; padding: 11px 0; border-bottom: 1px solid rgba(255,255,255,.08); text-decoration: none; }
  .nav-drop > a:active { color: #fff; }
  .nav-drop-user { margin-top: 10px; display: flex; gap: 18px; font-size: 13px; }
  .nav-drop-user a { color: #4ea1ff; text-decoration: none; }
}