/* ==========================================================================
   ImmTelecom (immtelecom.site) - 文章与专栏核心样式表
   规范：纯原生 CSS · 零外部重型库 · 极致排版与全端秒开
   ========================================================================== */

/* 文章专栏主容器 */
.article-container {
  width: 100%;
  max-width: 940px;
  margin: 0 auto;
  padding: 40px 24px 80px;
  position: relative;
  z-index: 2;
}

/* 面包屑导航 */
.breadcrumb-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 28px;
  flex-wrap: wrap;
}

.breadcrumb-nav a {
  color: var(--text-muted);
}

.breadcrumb-nav a:hover {
  color: var(--primary);
}

.breadcrumb-separator {
  color: rgba(255, 255, 255, 0.2);
}

.breadcrumb-current {
  color: var(--text-sub);
  font-weight: 500;
}

/* 文章头部 */
.article-header {
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 28px;
  margin-bottom: 36px;
}

.article-header .badge {
  margin-bottom: 16px;
}

.article-main-title {
  font-size: clamp(1.9rem, 3.6vw, 2.7rem);
  font-weight: 800;
  line-height: 1.32;
  letter-spacing: -0.015em;
  color: #ffffff;
  margin-bottom: 18px;
}

.article-meta-bar {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 0.86rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

.article-meta-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

/* 顶部导读提示盒 */
.lead-box {
  background: rgba(14, 21, 41, 0.85);
  border-left: 4px solid var(--primary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 20px 24px;
  margin-bottom: 36px;
  font-size: 1.02rem;
  line-height: 1.75;
  color: #e2e8f0;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

/* 目录引导 (TOC) */
.toc-box {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 22px 26px;
  margin-bottom: 40px;
}

.toc-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.toc-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 0.92rem;
}

.toc-list a {
  color: var(--accent-cyan);
  display: inline-block;
  transition: var(--transition);
}

.toc-list a:hover {
  color: #fff;
  transform: translateX(4px);
}

/* 文章正文排版 */
.article-body {
  font-size: 1.05rem;
  line-height: 1.85;
  color: #cbd5e1;
}

.article-body h2 {
  font-size: 1.68rem;
  font-weight: 800;
  color: #ffffff;
  margin: 44px 0 18px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  gap: 10px;
}

.article-body h2::before {
  content: "";
  display: inline-block;
  width: 4px;
  height: 24px;
  background: linear-gradient(180deg, #00f2fe, #38bdf8);
  border-radius: 2px;
}

.article-body h3 {
  font-size: 1.3rem;
  font-weight: 700;
  color: #f1f5f9;
  margin: 32px 0 14px;
}

.article-body p {
  margin-bottom: 22px;
}

.article-body strong {
  color: #ffffff;
  font-weight: 700;
}

.article-body ul, .article-body ol {
  margin: 18px 0 24px 22px;
}

.article-body ul li {
  list-style-type: disc;
  margin-bottom: 10px;
  padding-left: 6px;
}

.article-body ol li {
  list-style-type: decimal;
  margin-bottom: 10px;
  padding-left: 6px;
}

/* 警示与高亮框 */
.alert-box {
  background: rgba(14, 21, 41, 0.7);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  margin: 28px 0;
  border: 1px solid transparent;
}

.alert-tip {
  border-color: rgba(16, 185, 129, 0.35);
  background: rgba(16, 185, 129, 0.08);
}

.alert-warning {
  border-color: rgba(245, 158, 11, 0.35);
  background: rgba(245, 158, 11, 0.08);
}

.alert-info {
  border-color: rgba(56, 189, 248, 0.35);
  background: rgba(56, 189, 248, 0.08);
}

.alert-title {
  font-weight: 700;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
  color: #fff;
}

/* 对比表格样式 */
.comparison-table-wrapper {
  overflow-x: auto;
  margin: 32px 0;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.94rem;
}

.comparison-table th {
  background: rgba(14, 21, 41, 0.95);
  padding: 14px 18px;
  font-weight: 700;
  color: var(--text-main);
  border-bottom: 1px solid var(--border-subtle);
}

.comparison-table td {
  padding: 14px 18px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  color: var(--text-sub);
}

.comparison-table tr:hover td {
  background: rgba(255, 255, 255, 0.03);
}

/* 代码与配置高亮块 */
.code-block {
  background: #080d1a;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-md);
  padding: 18px 22px;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  color: #38bdf8;
  overflow-x: auto;
  margin: 24px 0;
  line-height: 1.6;
}

/* 文末 CTA 促销呼召卡片 (严格规范 rel="nofollow" target="_blank") */
.article-cta-box {
  background: linear-gradient(135deg, rgba(14, 26, 56, 0.95) 0%, rgba(20, 36, 76, 0.95) 100%);
  border: 1.5px solid var(--border-glow);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  margin: 48px 0;
  text-align: center;
  box-shadow: 0 0 35px rgba(0, 242, 254, 0.15);
}

.article-cta-title {
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 10px;
}

.article-cta-desc {
  font-size: 0.96rem;
  color: var(--text-sub);
  max-width: 600px;
  margin: 0 auto 24px;
}

/* 相关文章互联互通推荐区 (内部跳转) */
.related-articles-section {
  border-top: 1px solid var(--border-subtle);
  padding-top: 40px;
  margin-top: 60px;
}

.related-title {
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: 24px;
  color: #fff;
  display: flex;
  align-items: center;
  gap: 8px;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}

.related-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 20px;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.related-card:hover {
  border-color: var(--border-glow);
  transform: translateY(-4px);
  background: var(--bg-card-hover);
}

.related-card-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 8px;
  line-height: 1.45;
}

.related-card-link {
  font-size: 0.84rem;
  color: var(--primary);
  font-weight: 600;
  margin-top: 10px;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

@media (max-width: 768px) {
  .related-grid {
    grid-template-columns: 1fr;
  }
  .article-container {
    padding: 24px 16px 60px;
  }
  .article-main-title {
    font-size: 1.7rem;
  }
}