/* ===========================================================================
   blog.ipcloak.ai - 页面专属样式（Cyber Shield 子集）
   全局视觉走 cdn.ipcloak.ai/brand/cyber-shield.css
   =========================================================================== */

/* ----- 站内 Nav ----- */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  padding: 0.85rem 0;
  background: rgba(6, 8, 13, 0.7);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--ipcloak-border);
}
.site-nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.site-nav-brand {
  display: flex; align-items: center; gap: 0.6rem;
  text-decoration: none; color: var(--ipcloak-text);
  font-family: var(--ipcloak-font-display);
  font-weight: 700; font-size: 1.1rem;
  letter-spacing: -0.02em;
}
.site-nav-icon {
  width: 32px; height: 32px;
  border-radius: var(--ipcloak-radius-sm);
  background: linear-gradient(135deg, #6366f1 0%, #0f172a 100%);
  display: grid; place-items: center;
  color: #fff; font-weight: 800; font-size: 14px;
  box-shadow: 0 0 20px rgba(99, 102, 241, 0.4);
  border: 1px solid rgba(99, 102, 241, 0.3);
}
.site-nav ul {
  list-style: none; margin: 0; padding: 0;
  display: flex; gap: 1.75rem; align-items: center;
}
.site-nav ul a {
  color: var(--ipcloak-text-muted);
  font-size: 0.95rem; font-weight: 500;
  text-decoration: none; transition: color 0.2s;
}
.site-nav ul a:hover { color: var(--ipcloak-cyan); }
@media (max-width: 768px) {
  .site-nav ul li:not(.always-show) { display: none; }
}

/* ----- 文章卡片网格 ----- */
.article-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}
@media (max-width: 900px) { .article-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 600px) { .article-grid { grid-template-columns: 1fr; } }

.article-card {
  display: block;
  text-decoration: none;
  color: inherit;
  background: linear-gradient(135deg, rgba(255,255,255,0.03), rgba(255,255,255,0.01));
  backdrop-filter: blur(24px);
  border: 1px solid var(--ipcloak-border);
  border-radius: var(--ipcloak-radius-lg);
  padding: 1.5rem;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}
.article-card:hover {
  transform: translateY(-3px);
  border-color: rgba(99, 102, 241, 0.3);
  box-shadow: 0 12px 30px -8px rgba(0,0,0,0.5), 0 0 30px rgba(99, 102, 241, 0.1);
  color: inherit;
}

.article-tag {
  display: inline-block;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 700;
  padding: 0.22rem 0.6rem;
  border-radius: var(--ipcloak-radius-sm);
  border: 1px solid;
  margin-bottom: 0.85rem;
  font-family: var(--ipcloak-font-mono);
}
.article-tag.concept { background: rgba(99,102,241,0.1);  color: #818cf8; border-color: rgba(99,102,241,0.3); }
.article-tag.guide   { background: rgba(34,211,238,0.1);  color: #22d3ee; border-color: rgba(34,211,238,0.3); }
.article-tag.compare { background: rgba(245,158,11,0.1);  color: #fbbf24; border-color: rgba(245,158,11,0.3); }
.article-tag.case    { background: rgba(139,92,246,0.1);  color: #a78bfa; border-color: rgba(139,92,246,0.3); }

.article-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin: 0 0 0.5rem;
  line-height: 1.45;
  font-family: var(--ipcloak-font-display);
  color: var(--ipcloak-text);
  letter-spacing: -0.015em;
}
.article-card p {
  color: var(--ipcloak-text-muted);
  font-size: 0.92rem;
  margin: 0 0 0.6rem;
  line-height: 1.6;
}
.article-meta {
  font-size: 0.8rem;
  color: var(--ipcloak-text-subtle);
  font-family: var(--ipcloak-font-mono);
}

/* ----- 类目区块 ----- */
.category-block {
  margin: 3.5rem 0;
}
.category-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 1.5rem;
  border-bottom: 1px solid var(--ipcloak-border);
  padding-bottom: 0.75rem;
}
.category-header h2 {
  font-size: 1.4rem;
  font-weight: 700;
  margin: 0;
  font-family: var(--ipcloak-font-display);
  letter-spacing: -0.02em;
}
.category-header a {
  font-size: 0.9rem;
  color: var(--ipcloak-cyan);
  text-decoration: none;
  font-family: var(--ipcloak-font-mono);
}
.category-header a:hover { color: var(--ipcloak-blue); }

/* ----- 文章详情页 ----- */
.article-hero {
  padding: 4rem 0 1.5rem;
  position: relative;
}
.article-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 60% 50% at 50% 0%, rgba(99, 102, 241, 0.1), transparent 60%);
  pointer-events: none;
}
.article-hero .breadcrumb {
  font-size: 0.9rem;
  color: var(--ipcloak-text-muted);
  margin-bottom: 1rem;
  font-family: var(--ipcloak-font-mono);
}
.article-hero .breadcrumb a {
  color: var(--ipcloak-text-muted);
  text-decoration: none;
}
.article-hero .breadcrumb a:hover { color: var(--ipcloak-cyan); }
.article-hero h1 {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  max-width: 900px;
  margin: 0 0 0.75rem;
  line-height: 1.2;
}
.article-hero .meta {
  font-size: 0.9rem;
  color: var(--ipcloak-text-muted);
  font-family: var(--ipcloak-font-mono);
}

/* ----- 文章正文 ----- */
.article-body {
  padding: 3rem 0;
}
.article-body h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 2rem 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--ipcloak-border);
  font-family: var(--ipcloak-font-display);
}
.article-body h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin: 1.5rem 0 0.75rem;
  font-family: var(--ipcloak-font-display);
}
.article-body p { margin: 1rem 0; line-height: 1.75; }
.article-body ul, .article-body ol { margin: 1rem 0 1rem 1.5rem; }
.article-body li { margin: 0.4rem 0; }
.article-body a {
  color: var(--ipcloak-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(34,211,238,0.3);
}
.article-body a:hover {
  color: var(--ipcloak-blue);
  border-bottom-color: var(--ipcloak-blue);
}
.article-body code {
  font-family: var(--ipcloak-font-mono);
  background: rgba(255,255,255,0.05);
  padding: 2px 6px;
  border-radius: var(--ipcloak-radius-sm);
  font-size: 0.9em;
  color: var(--ipcloak-cyan);
}
.article-body pre {
  background: rgba(0,0,0,0.5);
  border: 1px solid var(--ipcloak-border);
  color: #e2e8f0;
  padding: 1.25rem;
  border-radius: var(--ipcloak-radius);
  overflow-x: auto;
  font-family: var(--ipcloak-font-mono);
  font-size: 0.85rem;
  line-height: 1.7;
  margin: 1.5rem 0;
}
.article-body pre code { background: none; padding: 0; color: inherit; }

.article-body blockquote {
  border-left: 4px solid var(--ipcloak-cyan);
  padding: 0.5rem 1.25rem;
  background: rgba(34, 211, 238, 0.04);
  color: var(--ipcloak-text);
  margin: 1.5rem 0;
  border-radius: 0 var(--ipcloak-radius) var(--ipcloak-radius) 0;
}
.article-body blockquote p { margin: 0.5rem 0; }

.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.95rem;
  background: rgba(15, 23, 42, 0.4);
  border: 1px solid var(--ipcloak-border);
  border-radius: var(--ipcloak-radius);
  overflow: hidden;
}
.article-body table th,
.article-body table td {
  text-align: left;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--ipcloak-border);
}
.article-body table th {
  background: rgba(255,255,255,0.03);
  font-weight: 700;
}

/* TOC sidebar */
.toc {
  background: rgba(15,23,42,0.5);
  border: 1px solid var(--ipcloak-border);
  padding: 1rem 1.25rem;
  border-radius: var(--ipcloak-radius);
  margin: 2rem 0;
  font-size: 0.92rem;
}
.toc-title {
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--ipcloak-cyan);
  font-family: var(--ipcloak-font-display);
  text-transform: uppercase;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
}
.toc ul { margin: 0; padding-left: 1.25rem; }
.toc li { margin: 0.3rem 0; }
.toc a {
  color: var(--ipcloak-text-muted);
  text-decoration: none;
}
.toc a:hover { color: var(--ipcloak-cyan); }

/* Related */
.related {
  margin: 3rem 0;
  padding-top: 2rem;
  border-top: 1px solid var(--ipcloak-border);
}
.related h2 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 1rem;
  border: none;
  padding: 0;
}