/* ==========================================================================
   assets/css/blog.css — HexClaw Technical Blog & Editorial Architecture
   Integrates seamlessly with docs-page / content-page system
   Refined editorial layout, provenance badges, and responsive article list
   ========================================================================== */

/* --------------------------------------------------------------------------
   Blog Hub & Article Main Container (aligned with .content-main)
   -------------------------------------------------------------------------- */
.blog-page .blog-main {
  margin: 0 auto;
  padding: 104px 24px 48px;
  max-width: var(--reading-width-wide, 960px);
}

.blog-article-page .blog-main {
  max-width: var(--reading-width, 820px);
  padding-top: 96px;
  padding-bottom: 24px;
}

.blog-hub-page .blog-main {
  max-width: var(--reading-width-wide, 960px);
  padding-top: 104px;
  padding-bottom: 40px;
}

.blog-page .footer {
  margin-top: 24px;
  border-top: 1px solid var(--border);
}

/* --------------------------------------------------------------------------
   Editorial Hub Header
   -------------------------------------------------------------------------- */
.blog-hub-header {
  margin-bottom: 36px;
  text-align: center;
}

.blog-hub-badge {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 5px 14px;
  border-radius: 999px;
  background: rgba(var(--accent-rgb), 0.08);
  border: 1px solid rgba(var(--accent-rgb), 0.22);
  color: var(--blue-deep);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  margin-bottom: 16px;
}

[data-theme="dark"] .blog-hub-badge {
  background: rgba(95, 179, 234, 0.14);
  border-color: rgba(95, 179, 234, 0.28);
  color: var(--blue-light);
}

.blog-hub-title {
  font-size: clamp(30px, 4.5vw, 42px);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 14px;
}

.blog-hub-desc {
  font-size: clamp(15px, 2vw, 17px);
  line-height: 1.75;
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto;
}

/* --------------------------------------------------------------------------
   Editorial Filter Tabs
   -------------------------------------------------------------------------- */
.blog-filter-bar {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin: 28px 0 36px;
}

.blog-filter-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  border-radius: 999px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease, transform 0.2s ease;
}

.blog-filter-btn:hover {
  border-color: var(--blue-deep);
  color: var(--blue-deep);
  transform: translateY(-1px);
}

.blog-filter-btn.is-active {
  background: var(--blue-deep);
  border-color: var(--blue-deep);
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(var(--accent-rgb), 0.25);
}

[data-theme="dark"] .blog-filter-btn.is-active {
  background: var(--blue);
  border-color: var(--blue);
  color: #0f1724;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.4);
}

.blog-filter-count {
  font-size: 12px;
  opacity: 0.85;
  padding: 1px 7px;
  border-radius: 999px;
  background: rgba(0, 0, 0, 0.08);
}

.blog-filter-btn.is-active .blog-filter-count {
  background: rgba(255, 255, 255, 0.25);
}

[data-theme="dark"] .blog-filter-btn.is-active .blog-filter-count {
  background: rgba(0, 0, 0, 0.22);
}

/* --------------------------------------------------------------------------
   Editorial Article Stream Layout (Single Column Rows)
   -------------------------------------------------------------------------- */
.blog-stream {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.blog-row {
  display: flex;
  flex-direction: column;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px 28px;
  text-decoration: none;
  color: inherit;
  transition: border-color 0.22s ease, transform 0.22s ease, box-shadow 0.22s ease;
  position: relative;
  overflow: hidden;
}

.blog-row::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  width: 4px;
  background: var(--blue-deep);
  opacity: 0;
  transition: opacity 0.22s ease;
}

[data-theme="dark"] .blog-row::before {
  background: var(--blue);
}

.blog-row:hover {
  transform: translateY(-2px);
  border-color: rgba(var(--accent-rgb), 0.38);
  box-shadow: 0 8px 24px rgba(var(--accent-rgb), 0.08);
}

[data-theme="dark"] .blog-row:hover {
  border-color: rgba(95, 179, 234, 0.35);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
}

.blog-row:hover::before {
  opacity: 1;
}

.blog-row-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 10px;
}

.blog-row-tags {
  display: flex;
  align-items: center;
  gap: 8px;
}

.blog-badge-series {
  font-size: 12px;
  font-weight: 650;
  padding: 3px 11px;
  border-radius: 999px;
  color: var(--blue-deep);
  background: rgba(var(--accent-rgb), 0.08);
  border: 1px solid rgba(var(--accent-rgb), 0.2);
  letter-spacing: 0.02em;
  line-height: 1.4;
}

[data-theme="dark"] .blog-badge-series {
  background: rgba(95, 179, 234, 0.12);
  border-color: rgba(95, 179, 234, 0.28);
  color: var(--blue-light);
}

.blog-badge-cat {
  font-size: 12px;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 999px;
  color: var(--blue-deep);
  background: rgba(var(--accent-rgb), 0.1);
}

[data-theme="dark"] .blog-badge-cat {
  color: var(--blue-light);
  background: rgba(95, 179, 234, 0.16);
}

.blog-row-date {
  font-size: 13px;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.blog-row-title {
  font-size: clamp(18px, 2.2vw, 21px);
  font-weight: 700;
  line-height: 1.45;
  color: var(--text-primary);
  margin-bottom: 8px;
  transition: color 0.2s ease;
}

.blog-row:hover .blog-row-title {
  color: var(--blue-deep);
}

[data-theme="dark"] .blog-row:hover .blog-row-title {
  color: var(--blue-light);
}

.blog-row-desc {
  font-size: 14.5px;
  line-height: 1.68;
  color: var(--text-secondary);
  margin-bottom: 14px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.blog-row-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
  color: var(--text-muted);
  border-top: 1px solid var(--border-soft);
  padding-top: 10px;
  margin-top: auto;
}

.blog-row-readlink {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-weight: 600;
  color: var(--blue-deep);
}

[data-theme="dark"] .blog-row-readlink {
  color: var(--blue-light);
}

/* --------------------------------------------------------------------------
   Article Reading Page — Refined Editorial Header & Typography
   -------------------------------------------------------------------------- */
.blog-breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 13.5px;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.blog-breadcrumb a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.2s ease;
}

.blog-breadcrumb a:hover {
  color: var(--blue-deep);
}

[data-theme="dark"] .blog-breadcrumb a:hover {
  color: var(--blue-light);
}

.blog-breadcrumb-sep {
  opacity: 0.45;
}

/* Article Hero Header */
.blog-header {
  border-bottom: 1px solid var(--border);
  padding-bottom: 24px;
  margin-bottom: 32px;
}

.blog-header-tags {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
}

.blog-article-title {
  font-size: clamp(22px, 3.2vw, 30px);
  font-weight: 800;
  line-height: 1.38;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-top: 10px;
  margin-bottom: 16px;
  text-wrap: balance;
  word-break: keep-all;
  overflow-wrap: break-word;
}

.u-nobr {
  white-space: nowrap;
}

@media (max-width: 640px) {
  .blog-article-title .u-nobr,
  .blog-row-title .u-nobr {
    white-space: normal;
  }
}

/* 维语正文沿用右至左阅读，代码和技术标识单独隔离。 */
[dir="rtl"] .blog-content :is(pre, code) {
  direction: ltr;
  unicode-bidi: isolate;
}

[dir="rtl"] .blog-content pre {
  text-align: left;
}

[dir="rtl"] .blog-content :is(ul, ol) {
  margin-inline: 1.5em 0;
  padding-inline: 0.5em 0;
}

[dir="rtl"] .blog-content :is(th, td) {
  text-align: start;
}

.blog-article-subtitle {
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--text-secondary);
  margin-bottom: 22px;
  font-weight: 400;
  padding: 12px 18px;
  background: rgba(var(--accent-rgb), 0.035);
  border-left: 3px solid var(--blue-deep);
  border-radius: 0 10px 10px 0;
  max-width: 100%;
}

[data-theme="dark"] .blog-article-subtitle {
  background: rgba(255, 255, 255, 0.03);
  border-left-color: var(--blue-light);
  color: #cbd5e1;
}

/* Provenance Banner (微信官方来源存证栏) */
.article-provenance-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  padding: 12px 18px;
  border-radius: 12px;
  background: rgba(var(--accent-rgb), 0.04);
  border: 1px solid rgba(var(--accent-rgb), 0.16);
  font-size: 13px;
  color: var(--text-secondary);
}

[data-theme="dark"] .article-provenance-banner {
  background: rgba(255, 255, 255, 0.03);
  border-color: rgba(95, 179, 234, 0.18);
}

.provenance-left {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.provenance-origin-badge {
  font-size: 11px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 999px;
  background: rgba(var(--accent-rgb), 0.14);
  color: var(--blue-deep);
}

[data-theme="dark"] .provenance-origin-badge {
  background: rgba(95, 179, 234, 0.2);
  color: var(--blue-light);
}

.provenance-text {
  color: var(--text-secondary);
}

.provenance-link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 12px;
  border-radius: 8px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--blue-deep);
  font-weight: 600;
  font-size: 13px;
  text-decoration: none;
  transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.provenance-link:hover {
  border-color: var(--blue-deep);
  background: rgba(var(--accent-rgb), 0.1);
}

[data-theme="dark"] .provenance-link {
  color: var(--blue-light);
  border-color: rgba(95, 179, 234, 0.25);
}

/* Article Body Typography (inherits from docs-page) */
.blog-content {
  font-size: 17px;
  line-height: 1.85;
  color: var(--text-primary);
  overflow-wrap: anywhere;
}

[data-theme="dark"] .blog-page {
  background: var(--bg);
}

/* 仅供公众号正文的内联色值使用，浅色继续取原稿中的回退值。 */
[data-theme="dark"] .blog-content {
  --article-ink: var(--text-primary);
  --article-secondary: var(--text-secondary);
  --article-muted: var(--text-muted);
  --article-accent: var(--blue-light);
  --article-panel: var(--bg-subtle);
  --article-border: var(--border-strong);
}

.blog-content p {
  margin: 1.35em 0;
  word-break: break-word;
}

.blog-content h2 {
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text-primary);
  margin: 2em 0 0.8em;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

.blog-content h3 {
  font-size: 19.5px;
  font-weight: 700;
  color: var(--text-primary);
  margin: 1.7em 0 0.6em;
}

.blog-content h4 {
  font-size: 16.5px;
  font-weight: 700;
  color: var(--text-primary);
  margin: 1.4em 0 0.5em;
}

.blog-content blockquote {
  border-left: 4px solid var(--blue-deep);
  background: var(--bg-subtle);
  padding: 16px 20px;
  margin: 1.5em 0;
  border-radius: 0 12px 12px 0;
  color: var(--text-secondary);
  font-size: 15px;
  line-height: 1.75;
}

[data-theme="dark"] .blog-content blockquote {
  background: rgba(255, 255, 255, 0.04);
  border-left-color: var(--blue);
}

.blog-content pre {
  background: #141b26;
  color: #e2e8f0;
  padding: 18px 22px;
  border-radius: 12px;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 14px;
  line-height: 1.6;
  margin: 1.6em 0;
  border: 1px solid rgba(255, 255, 255, 0.08);
  max-width: 100%;
  overflow-wrap: normal;
}

/* 公众号原稿以 display:block 标记整块程序，不能套用行内代码底色。 */
.blog-content code:not(pre code):not([style*="display:block"]):not([style*="display: block"]) {
  font-family: var(--mono);
  font-size: 0.88em;
  padding: 2px 6px;
  border-radius: 6px;
  background: var(--bg-subtle);
  color: var(--blue-deep);
  border: 1px solid var(--border-soft);
}

[data-theme="dark"] .blog-content code:not(pre code):not([style*="display:block"]):not([style*="display: block"]) {
  background: rgba(255, 255, 255, 0.08);
  color: var(--blue-light);
}

.blog-content ul, .blog-content ol {
  margin: 1.2em 0 1.2em 1.5em;
  padding-left: 0.5em;
}

.blog-content li {
  margin-bottom: 0.5em;
  line-height: 1.75;
}

.blog-content figure {
  margin: 2em 0;
  text-align: center;
}

.blog-content figure img {
  max-width: 100%;
  height: auto;
  border-radius: 12px;
  border: 1px solid var(--border);
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.05);
}

[data-theme="dark"] .blog-content figure img {
  border-color: rgba(255, 255, 255, 0.1);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.35);
}

.blog-content figcaption {
  margin-top: 10px;
  font-size: 13px;
  color: var(--text-muted);
}

.blog-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.8em 0;
  font-size: 14px;
}

.blog-content th, .blog-content td {
  padding: 10px 14px;
  border: 1px solid var(--border);
  text-align: left;
}

.blog-content th {
  background: var(--bg-subtle);
  font-weight: 700;
  color: var(--text-primary);
}

.blog-content tr:nth-child(even) {
  background: rgba(var(--accent-rgb), 0.02);
}

/* --------------------------------------------------------------------------
   Article Bottom Navigation (Compact, Zero Overlap)
   -------------------------------------------------------------------------- */
.blog-series-nav {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin: 40px 0 0;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

@media (max-width: 640px) {
  .blog-series-nav {
    grid-template-columns: minmax(0, 1fr);
  }
}

.blog-nav-card {
  display: flex;
  flex-direction: column;
  padding: 16px 20px;
  border-radius: 14px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  text-decoration: none;
  color: inherit;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.blog-nav-card:hover {
  transform: translateY(-2px);
  border-color: var(--blue-deep);
  box-shadow: 0 6px 18px rgba(var(--accent-rgb), 0.08);
}

[data-theme="dark"] .blog-nav-card:hover {
  border-color: var(--blue);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.3);
}

.blog-nav-card.prev {
  text-align: left;
}

.blog-nav-card.next {
  text-align: right;
}

.blog-nav-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--blue-deep);
  margin-bottom: 4px;
}

[data-theme="dark"] .blog-nav-label {
  color: var(--blue-light);
}

.blog-nav-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.45;
}

/* --------------------------------------------------------------------------
   Floating Back-to-Top Button
   -------------------------------------------------------------------------- */
.back-to-top {
  position: fixed;
  bottom: 32px;
  inset-inline-end: 32px;
  z-index: 90;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.88);
  border: 1px solid var(--border-strong);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
  color: var(--text-primary);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  opacity: 0;
  transform: translateY(12px);
  pointer-events: none;
  transition: opacity 0.25s ease, transform 0.25s ease, background 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease, color 0.2s ease;
}

.back-to-top.is-visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.back-to-top:hover {
  background: #ffffff;
  border-color: var(--blue-deep);
  color: var(--blue-deep);
  box-shadow: 0 6px 20px rgba(var(--accent-rgb), 0.2);
  transform: translateY(-2px);
}

[data-theme="dark"] .back-to-top {
  background: rgba(21, 30, 45, 0.85);
  border-color: rgba(95, 179, 234, 0.25);
  color: #e2e8f0;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.4);
}

[data-theme="dark"] .back-to-top:hover {
  background: rgba(30, 45, 65, 0.95);
  border-color: var(--blue);
  color: var(--blue-light);
}

@media (max-width: 640px) {
  .back-to-top {
    bottom: 24px;
    inset-inline-end: 20px;
    padding: 7px 12px;
    font-size: 12px;
  }
}