:root {
  --brand: #1aa260;
  --brand-dark: #138043;
}
body { background: #f5f6f8; color: #333; }
a { color: inherit; }

/* 顶部条 */
.topbar { background: #222; color: #ccc; font-size: 13px; }
.topbar a { color: #ccc; }

/* 站点头部 */
.site-header { background: #fff; border-bottom: 3px solid var(--brand); }
.brand-badge {
  width: 44px; height: 44px; border-radius: 8px;
  background: var(--brand); color: #fff; font-size: 24px; font-weight: bold;
  display: inline-flex; align-items: center; justify-content: center;
}
.brand-name { font-size: 26px; font-weight: 700; color: var(--brand-dark); }
.search-box .form-control:focus { box-shadow: none; border-color: var(--brand); }

/* 导航 */
.navbar-main { background: var(--brand); }
.nav-link-main {
  color: #fff !important; padding: 12px 18px; font-weight: 500;
  text-decoration: none; display: inline-block;
}
.nav-link-main:hover { background: var(--brand-dark); }

/* 分类入口 */
.cat-entry {
  background: #fff; border: 1px solid #eee; border-radius: 10px;
  transition: .2s; color: #444 !important;
}
.cat-entry:hover { box-shadow: 0 4px 14px rgba(0,0,0,.08); transform: translateY(-2px); }
.cat-icon {
  width: 46px; height: 46px; margin: 0 auto; border-radius: 50%;
  background: linear-gradient(135deg, var(--brand), #2bc07d); color: #fff;
  display: flex; align-items: center; justify-content: center; font-size: 20px; font-weight: bold;
}

/* 区块标题 */
.section-title {
  border-left: 4px solid var(--brand); padding-left: 10px; margin: 18px 0 14px;
  font-weight: 700;
}

/* 资源卡片 */
.resource-card { border: 1px solid #eee; transition: .2s; }
.resource-card:hover { box-shadow: 0 6px 18px rgba(0,0,0,.1); }
.resource-card .card-img-top { height: 150px; object-fit: cover; }
.card-img-placeholder {
  height: 150px; background: linear-gradient(135deg, #1aa260, #2bc07d);
  font-size: 48px; font-weight: bold;
}
.card-title { font-size: 15px; line-height: 1.4; }

/* 下载框 */
.download-box { border-color: var(--brand) !important; }

/* 页脚 */
.site-footer { background: #2b2f33; color: #bbb; margin-top: 30px; }
.site-footer a { color: #bbb; }

/* 内容排版 */
.post-content { font-size: 15px; }