/* ===== 案例详情页（博客两栏布局） ===== */
.article-layout {
  width: min(1100px, 92%);
  margin: 0 auto;
  padding: 110px 0 80px;
  display: grid;
  grid-template-columns: 250px 1fr;
  gap: 44px;
  align-items: start;
}

/* 左侧案例目录 */
.article-sidebar {
  position: sticky;
  top: 90px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 18px;
}
.sidebar-title {
  font-size: 13px;
  letter-spacing: 2px;
  color: var(--text-dim);
  text-transform: uppercase;
  margin-bottom: 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}

/* 搜索框 */
.sidebar-search {
  width: 100%;
  box-sizing: border-box;
  margin-bottom: 14px;
  padding: 9px 12px;
  font-size: 13.5px;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  outline: none;
  transition: border-color 0.2s;
}
.sidebar-search:focus { border-color: var(--primary); }
.sidebar-search::placeholder { color: var(--text-dim); }

/* 列表项 */
.article-list {
  list-style: none;
  padding: 0;
  margin: 0 0 16px;
  display: grid;
  gap: 4px;
}
.list-empty {
  color: var(--text-dim);
  font-size: 13.5px;
  padding: 10px 12px;
}
.article-list a {
  display: block;
  color: var(--text-dim);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.5;
  padding: 9px 12px;
  border-radius: 8px;
  border-left: 2px solid transparent;
  transition: all 0.2s;
}
.article-list a:hover {
  color: var(--primary);
  background: rgba(34, 211, 238, 0.06);
}
.article-list li.active a {
  color: var(--primary);
  background: rgba(34, 211, 238, 0.08);
  border-left-color: var(--primary);
  font-weight: 600;
}
.sidebar-back {
  display: block;
  padding-top: 14px;
  border-top: 1px solid var(--border);
  color: var(--text-dim);
  text-decoration: none;
  font-size: 14px;
  transition: color 0.2s;
}
.sidebar-back:hover { color: var(--primary); }

/* 右侧正文 */
.article-main {
  min-width: 0;
}

.back-link {
  display: inline-block;
  color: var(--text-dim);
  text-decoration: none;
  font-size: 14.5px;
  margin-bottom: 24px;
  transition: color 0.2s;
}
.back-link:hover { color: var(--primary); }

.article-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 16px;
}
.article-meta time { color: var(--text-dim); font-size: 13.5px; }

.article-main h1 {
  font-size: clamp(26px, 4vw, 36px);
  margin-bottom: 14px;
}

.article-intro {
  color: var(--text-dim);
  font-size: 16px;
  border-left: 3px solid var(--primary);
  padding-left: 14px;
  margin-bottom: 28px;
}

.article-cover {
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  margin-bottom: 34px;
}

/* 章节内插图 */
.article-img {
  width: 100%;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  margin: 6px 0 22px;
  display: block;
}

.article-content h2 {
  font-size: 21px;
  margin: 36px 0 14px;
  padding-left: 12px;
  border-left: 4px solid var(--primary);
}
.article-content p {
  color: var(--text-dim);
  font-size: 15.5px;
  margin-bottom: 12px;
}
.article-content ul {
  color: var(--text-dim);
  font-size: 15.5px;
  padding-left: 22px;
  margin-bottom: 12px;
  display: grid;
  gap: 8px;
}
.article-content li::marker { color: var(--primary); }

/* 相关服务内链 */
.article-related {
  margin-top: 40px;
  padding: 20px 24px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.article-related h3 { font-size: 17px; margin-bottom: 8px; }
.article-related p { font-size: 14.5px; }
.article-related a { color: var(--primary); text-decoration: none; }
.article-related a:hover { text-decoration: underline; }

/* 上一篇 / 下一篇 */
.article-nav {
  margin-top: 50px;
  padding-top: 26px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  gap: 16px;
}
.art-link {
  color: var(--text);
  text-decoration: none;
  font-size: 14.5px;
  max-width: 46%;
  transition: color 0.2s;
}
.art-link:hover { color: var(--primary); }
.art-next { text-align: right; margin-left: auto; }

/* 案例不存在 */
.article-notfound {
  text-align: center;
  padding: 80px 20px;
}
.article-notfound h1 { margin-bottom: 12px; }
.article-notfound p { color: var(--text-dim); margin-bottom: 24px; }

@media (max-width: 860px) {
  .article-layout {
    grid-template-columns: 1fr;
    gap: 28px;
    padding-top: 100px;
  }
  .article-sidebar {
    position: static;
  }
}

@media (max-width: 600px) {
  .article-nav { flex-direction: column; }
  .art-link { max-width: 100%; }
  .art-next { text-align: left; }
}