/* ================================================================
   Pure Theme — Main Stylesheet
   ================================================================ */

/* ----------------------------------------------------------------
   1. CSS Variables (Design Tokens)
   ---------------------------------------------------------------- */
:root {
  --color-primary:        #2563eb;
  --color-primary-hover:  #1d4ed8;
  --color-primary-light:  #eff6ff;

  --color-text:           #1a1a1a;
  --color-text-secondary: #4b5563;
  --color-text-muted:     #9ca3af;

  --color-bg:             #ffffff;
  --color-bg-secondary:   #f9fafb;
  --color-bg-tertiary:    #f3f4f6;

  --color-border:         #e5e7eb;
  --color-border-light:   #f3f4f6;

  --color-code-bg:        #f3f4f6;
  --color-code-text:      #d63384;

  --hl-comment:  #999;
  --hl-keyword:  #c9c;
  --hl-string:   #9c9;
  --hl-number:   #f99157;
  --hl-title:    #f2777a;
  --hl-symbol:   #6cc;
  --hl-function: #69c;
  --hl-operator: #ccc;

  --font-sans:   -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
                 "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-serif:  "Georgia", "Noto Serif SC", "Source Han Serif SC", serif;
  --font-mono:   "JetBrains Mono", "Fira Code", "Cascadia Code", "Source Code Pro",
                 ui-monospace, monospace;

  --text-base:   1rem;
  --text-sm:     0.875rem;
  --text-xs:     0.75rem;
  --text-lg:     1.125rem;
  --text-xl:     1.25rem;
  --text-2xl:    1.5rem;
  --text-3xl:    1.875rem;
  --text-4xl:    2.25rem;

  --leading-tight:  1.35;
  --leading-normal: 1.75;
  --leading-loose:  2;

  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.25rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;

  --container-max:  1200px;
  --content-max:    740px;
  --sidebar-width:  280px;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;

  --shadow-sm: 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.06);
  --shadow-md: 0 4px 6px rgba(0,0,0,.06), 0 2px 4px rgba(0,0,0,.05);
  --shadow-lg: 0 10px 25px rgba(0,0,0,.08), 0 4px 10px rgba(0,0,0,.05);

  --header-height: 64px;
  --transition:    200ms ease;
  --transition-slow: 350ms ease;
}

/* Dark mode */
[data-theme="dark"] {
  --color-primary:        #3b82f6;
  --color-primary-hover:  #60a5fa;
  --color-primary-light:  #1e3a5f;

  --color-text:           #f1f5f9;
  --color-text-secondary: #94a3b8;
  --color-text-muted:     #64748b;

  --color-bg:             #0f172a;
  --color-bg-secondary:   #1e293b;
  --color-bg-tertiary:    #334155;

  --color-border:         #334155;
  --color-border-light:   #1e293b;

  --color-code-bg:        #1e293b;
  --color-code-text:      #f472b6;

  --hl-comment:  #8a8a8a;
  --hl-keyword:  #c9c;
  --hl-string:   #9c9;
  --hl-number:   #f99157;
  --hl-title:    #f2777a;
  --hl-symbol:   #6cc;
  --hl-function: #69c;
  --hl-operator: #ccc;

  --shadow-sm: 0 1px 3px rgba(0,0,0,.3);
  --shadow-md: 0 4px 6px rgba(0,0,0,.25);
  --shadow-lg: 0 10px 25px rgba(0,0,0,.3);
}

/* ----------------------------------------------------------------
   2. Reset & Base
   ---------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-text);
  background: var(--color-bg);
  transition: background var(--transition), color var(--transition);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover { color: var(--color-primary-hover); text-decoration: underline; }

img { max-width: 100%; height: auto; display: block; }

ul, ol { padding-left: var(--space-6); }

hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: var(--space-8) 0;
}

/* 桌面端：内容区宽度与 .container 一致，不在容器内再缩一层 */
@media (min-width: 1024px) {
  :root { --content-max: var(--container-max); }
}

/* ----------------------------------------------------------------
   3. Layout
   ---------------------------------------------------------------- */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.main-content {
  flex: 1;
  padding: var(--space-10) 0 var(--space-16);
}

/* ----------------------------------------------------------------
   4. Header
   ---------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  background: rgba(255,255,255,.85);
  transition: background var(--transition), border-color var(--transition);
}
[data-theme="dark"] .site-header {
  background: rgba(15,23,42,.85);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  height: var(--header-height);
}

.brand-link {
  text-decoration: none;
  flex-shrink: 0;
}
.brand-title {
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -.02em;
}
.brand-logo { height: 32px; width: auto; }

.site-nav { margin-left: auto; }
.nav-list {
  display: flex;
  list-style: none;
  padding: 0;
  gap: var(--space-1);
}
.nav-link {
  display: block;
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: color var(--transition), background var(--transition);
}
.nav-link:hover, .nav-link.active {
  color: var(--color-primary);
  background: var(--color-primary-light);
  text-decoration: none;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.icon-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: none;
  background: transparent;
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: color var(--transition), background var(--transition);
}
.icon-btn:hover {
  color: var(--color-text);
  background: var(--color-bg-tertiary);
}

/* Theme toggle icons */
[data-theme="light"] .icon-moon { display: block; }
[data-theme="light"] .icon-sun  { display: none; }
[data-theme="dark"]  .icon-sun  { display: block; }
[data-theme="dark"]  .icon-moon { display: none; }

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
}
.hamburger span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ----------------------------------------------------------------
   5. Footer
   ---------------------------------------------------------------- */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-8) 0;
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}
.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-4);
  text-align: center;
}
.footer-links {
  display: flex;
  gap: var(--space-4);
}
.footer-links a {
  color: var(--color-text-muted);
  transition: color var(--transition);
}
.footer-links a:hover { color: var(--color-primary); text-decoration: none; }
.footer-info { display: flex; flex-wrap: wrap; justify-content: center; gap: var(--space-2); }
.footer-info a { color: var(--color-text-muted); }
.footer-info a:hover { color: var(--color-primary); }
.footer-sep { color: var(--color-border); }
.footer-last-updated {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

/* ----------------------------------------------------------------
   6. 文章列表（首页 / 标签 / 分类页）
   ---------------------------------------------------------------- */
.post-list {
  display: flex;
  flex-direction: column;
  max-width: var(--content-max);
  margin: 0 auto;
}

.post-item {
  position: relative;
  padding: var(--space-5) var(--space-5);
  border-bottom: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  transition: background var(--transition), padding-left var(--transition);
}
.post-item:first-child { border-top: 1px solid var(--color-border-light); }

.post-item:hover {
  background: var(--color-bg-secondary);
  padding-left: calc(var(--space-5) + 8px);
}

/* 左侧渐入色条 */
.post-item::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 0;
  background: var(--color-primary);
  border-radius: 0 2px 2px 0;
  transition: height var(--transition);
}
.post-item:hover::before {
  height: 60%;
}

.post-item-title {
  font-size: var(--text-lg);
  font-weight: 600;
  line-height: var(--leading-tight);
  margin-bottom: var(--space-2);
}
.post-item-title a {
  color: var(--color-text);
  text-decoration: none;
  transition: color var(--transition);
}
.post-item-title a:hover { color: var(--color-primary); text-decoration: none; }

.post-item-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.meta-sep { color: var(--color-border); }
.meta-category {
  color: var(--color-primary);
  font-weight: 500;
}
.meta-category:hover { text-decoration: none; opacity: .8; }

.post-tags { display: flex; flex-wrap: wrap; gap: var(--space-2); }
.tag {
  display: inline-block;
  padding: 2px var(--space-3);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-primary);
  background: var(--color-primary-light);
  border-radius: var(--radius-full);
  text-decoration: none;
  transition: background var(--transition), color var(--transition);
}
.tag:hover {
  background: var(--color-primary);
  color: #fff;
  text-decoration: none;
}

/* ----------------------------------------------------------------
   7. Pagination
   ---------------------------------------------------------------- */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  margin-top: var(--space-10);
  flex-wrap: wrap;
}
.page-btn {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: all var(--transition);
}
.page-btn:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
  text-decoration: none;
}
.page-numbers { display: flex; gap: var(--space-1); }
.page-num {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 36px;
  height: 36px;
  padding: 0 var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: all var(--transition);
}
.page-num:hover, .page-num.active {
  color: #fff;
  background: var(--color-primary);
  border-color: var(--color-primary);
  text-decoration: none;
}
.page-ellipsis {
  display: flex;
  align-items: center;
  padding: 0 var(--space-2);
  color: var(--color-text-muted);
}

/* ----------------------------------------------------------------
   8. Post Article
   ---------------------------------------------------------------- */
.post-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  max-width: var(--content-max);
  margin: 0 auto;
}

/* When TOC is present, use sidebar layout on wide screens */
@media (min-width: 1100px) {
  /* 只有确实存在目录时才分两列，否则正文独占整行 */
  .post-layout:not(.no-toc) {
    max-width: min(calc(var(--content-max) + var(--sidebar-width) + var(--space-8)), var(--container-max));
    grid-template-columns: var(--sidebar-width) 1fr;
    align-items: start;
  }
  .toc-wrap { position: sticky; top: calc(var(--header-height) + var(--space-6)); }
}

/* 防止 grid 子项被宽代码块撑出容器 */
.post-article { min-width: 0; }

.post-header { margin-bottom: var(--space-8); }
.post-title {
  font-size: var(--text-3xl);
  font-weight: 800;
  line-height: var(--leading-tight);
  letter-spacing: -.02em;
  margin-bottom: var(--space-4);
}
.post-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}
.post-cover {
  margin-top: var(--space-6);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.post-cover img { width: 100%; object-fit: cover; max-height: 480px; }

.post-outdated {
  margin-bottom: var(--space-8);
  padding: var(--space-4) var(--space-5);
  border: 1px solid #f59e0b;
  border-left-width: 4px;
  border-radius: var(--radius-md);
  background: #fffbeb;
  color: #78350f;
}
.post-outdated strong {
  display: block;
  margin-bottom: var(--space-1);
  font-size: var(--text-sm);
}
.post-outdated p {
  margin: 0;
  font-size: var(--text-sm);
  line-height: 1.7;
}
[data-theme="dark"] .post-outdated {
  background: rgba(245, 158, 11, .12);
  color: #fcd34d;
}

/* ----------------------------------------------------------------
   9. Post Content (Markdown rendering)
   ---------------------------------------------------------------- */
.post-content {
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-text);
}
.post-content > * + * { margin-top: var(--space-5); }

.post-content h1,
.post-content h2,
.post-content h3,
.post-content h4,
.post-content h5,
.post-content h6 {
  font-weight: 700;
  line-height: var(--leading-tight);
  letter-spacing: -.01em;
  margin-top: var(--space-10);
  margin-bottom: var(--space-4);
  scroll-margin-top: calc(var(--header-height) + var(--space-4));
}
.post-content h1 { font-size: var(--text-3xl); }
.post-content h2 {
  font-size: var(--text-2xl);
  padding-bottom: var(--space-2);
  border-bottom: 2px solid var(--color-border);
}
.post-content h3 { font-size: var(--text-xl); }
.post-content h4 { font-size: var(--text-lg); }
.post-content h5, .post-content h6 { font-size: var(--text-base); }

.post-content p { margin: var(--space-5) 0; }

.post-content a { color: var(--color-primary); text-decoration: underline; text-underline-offset: 3px; }
.post-content a:hover { color: var(--color-primary-hover); }

.post-content strong { font-weight: 700; }
.post-content em { font-style: italic; }

.post-content ul, .post-content ol {
  padding-left: var(--space-6);
  margin: var(--space-5) 0;
}
.post-content li { margin: var(--space-2) 0; }
.post-content li > ul, .post-content li > ol { margin: var(--space-2) 0; }

.post-content blockquote {
  border-left: 4px solid var(--color-primary);
  padding: var(--space-4) var(--space-6);
  margin: var(--space-6) 0;
  background: var(--color-bg-secondary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  color: var(--color-text-secondary);
  font-style: italic;
}
.post-content blockquote > * + * { margin-top: var(--space-3); }

/* Admonition blocks */
.admonition {
  margin: var(--space-6) 0;
  padding: var(--space-4) var(--space-5);
  border: 1px solid var(--color-border);
  border-left-width: 4px;
  border-radius: var(--radius-md);
  background: var(--color-bg-secondary);
}
.admonition-title {
  margin-bottom: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-text);
}
.admonition-content > *:first-child { margin-top: 0; }
.admonition-content > *:last-child { margin-bottom: 0; }
.admonition-note,
.admonition-info { border-left-color: #2563eb; }
.admonition-tip,
.admonition-success { border-left-color: #16a34a; }
.admonition-warning { border-left-color: #f59e0b; }
.admonition-danger { border-left-color: #dc2626; }
.admonition-note .admonition-title,
.admonition-info .admonition-title { color: #2563eb; }
.admonition-tip .admonition-title,
.admonition-success .admonition-title { color: #15803d; }
.admonition-warning .admonition-title { color: #b45309; }
.admonition-danger .admonition-title { color: #dc2626; }
[data-theme="dark"] .admonition-note .admonition-title,
[data-theme="dark"] .admonition-info .admonition-title { color: #60a5fa; }
[data-theme="dark"] .admonition-tip .admonition-title,
[data-theme="dark"] .admonition-success .admonition-title { color: #4ade80; }
[data-theme="dark"] .admonition-warning .admonition-title { color: #fbbf24; }
[data-theme="dark"] .admonition-danger .admonition-title { color: #f87171; }

/* Inline code */
.post-content code:not([class]) {
  font-family: var(--font-mono);
  font-size: .875em;
  padding: 2px 6px;
  background: var(--color-code-bg);
  color: var(--color-code-text);
  border-radius: var(--radius-sm);
}

/* Code blocks */
.post-content pre {
  position: relative;
  margin: var(--space-6) 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.post-content pre code {
  display: block;
  padding: var(--space-5) var(--space-6);
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  line-height: 1.7;
  background: transparent;
  color: inherit;
}

/* Copy button */
.code-copy-btn {
  position: absolute;
  top: var(--space-3);
  right: var(--space-3);
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  font-family: var(--font-sans);
  color: #aaa;
  background: rgba(255,255,255,.1);
  border: 1px solid rgba(255,255,255,.15);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
  opacity: 0;
}
.post-content pre:hover .code-copy-btn { opacity: 1; }
.code-copy-btn:hover { color: #fff; background: rgba(255,255,255,.2); }

/* Tables */
.post-content table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-6) 0;
  font-size: var(--text-sm);
  overflow-x: auto;
  display: block;
}
.post-content th, .post-content td {
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-border);
  text-align: left;
}
.post-content th {
  background: var(--color-bg-secondary);
  font-weight: 600;
}
.post-content tr:nth-child(even) td { background: var(--color-bg-secondary); }

/* Images */
.post-content img {
  max-width: 100%;
  border-radius: var(--radius-md);
  margin: var(--space-6) auto;
  cursor: zoom-in;
}
.post-content figure { margin: var(--space-6) 0; text-align: center; }
.post-content figcaption {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-top: var(--space-2);
}

/* ----------------------------------------------------------------
   10. Post Footer
   ---------------------------------------------------------------- */
.post-footer {
  margin-top: var(--space-10);
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.post-copyright {
  padding: var(--space-5) var(--space-6);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.8;
}
.post-copyright p + p { margin-top: var(--space-2); }
.post-copyright a { color: var(--color-primary); }

/* Series navigation */
.post-series {
  margin-top: var(--space-10);
  padding: var(--space-5) var(--space-6);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg-secondary);
}
.post-series-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-4);
  margin-bottom: var(--space-4);
}
.post-series-kicker {
  display: block;
  margin-bottom: 2px;
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--color-primary);
}
.post-series-title {
  font-size: var(--text-lg);
  line-height: var(--leading-tight);
  margin: 0;
}
.post-series-count {
  flex-shrink: 0;
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  padding: 2px var(--space-3);
}
.post-series-list {
  list-style: none;
  padding: 0;
  margin: 0;
}
.post-series-item + .post-series-item { margin-top: var(--space-2); }
.post-series-item a {
  display: grid;
  grid-template-columns: 28px 1fr;
  gap: var(--space-3);
  align-items: center;
  padding: var(--space-2) var(--space-3);
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
  text-decoration: none;
}
.post-series-item a:hover {
  color: var(--color-primary);
  background: var(--color-bg);
  text-decoration: none;
}
.post-series-item.active a {
  color: var(--color-primary);
  background: var(--color-primary-light);
  font-weight: 600;
}
.post-series-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  background: var(--color-bg-tertiary);
  border-radius: var(--radius-full);
}
.post-series-item.active .post-series-index {
  color: #fff;
  background: var(--color-primary);
}
.post-series-link-title {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.post-series-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3);
  margin-top: var(--space-5);
}
.post-series-nav-item {
  min-width: 0;
  padding: var(--space-3) var(--space-4);
  color: var(--color-text-secondary);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  text-decoration: none;
}
.post-series-nav-item:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
  text-decoration: none;
}
.post-series-nav-item span {
  display: block;
  margin-bottom: 2px;
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}
.post-series-nav-item strong {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  font-size: var(--text-sm);
  line-height: var(--leading-tight);
  color: var(--color-text);
}
.post-series-nav-next { text-align: right; }

/* Share */
.share-section {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-3);
}
.share-label { font-size: var(--text-sm); color: var(--color-text-muted); }
.share-buttons { display: flex; flex-wrap: wrap; gap: var(--space-2); }
.share-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition);
}
.share-btn:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
  text-decoration: none;
}

/* Post nav */
.post-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
  margin-top: var(--space-8);
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-border);
}
.post-nav-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: all var(--transition);
}
.post-nav-item:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-sm);
  text-decoration: none;
}
.post-nav-next { text-align: right; }
.post-nav-label {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: .05em;
}
.post-nav-title {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ----------------------------------------------------------------
   11. TOC
   ---------------------------------------------------------------- */
.toc-wrap {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  font-size: var(--text-sm);
  max-height: calc(100vh - var(--header-height) - var(--space-12));
  overflow-y: auto;
  overflow-x: hidden;
}
.toc-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-weight: 600;
  margin-bottom: var(--space-3);
  color: var(--color-text);
}
.toc-toggle {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-text-muted);
  padding: 2px;
  transition: transform var(--transition);
}
.toc-toggle.collapsed { transform: rotate(180deg); }
.toc-nav { transition: all var(--transition); }
.toc-nav.hidden { display: none; }
.toc-nav ol, .toc-nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.toc-nav li { margin: 0; }
.toc-nav a {
  display: block;
  padding: 4px var(--space-3) 4px var(--space-3);
  color: var(--color-text-secondary);
  border-left: 2px solid transparent;
  text-decoration: none;
  transition: all var(--transition);
  line-height: 1.6;
  word-break: break-word;
  overflow-wrap: break-word;
  hyphens: auto;
}
.toc-nav a:hover { color: var(--color-primary); border-left-color: var(--color-primary); }
.toc-nav a.active {
  color: var(--color-primary);
  border-left-color: var(--color-primary);
  background: var(--color-primary-light);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}
/* Indent nested levels — each level indents ~1.5rem further */
.toc-nav ol ol a { padding-left: calc(var(--space-3) + 1.25rem); }
.toc-nav ol ol ol a { padding-left: calc(var(--space-3) + 2.5rem); }
.toc-nav ol ol ol ol a { padding-left: calc(var(--space-3) + 3.75rem); }
.toc-nav ol ol ol ol ol a { padding-left: calc(var(--space-3) + 5rem); }

/* ----------------------------------------------------------------
   12. Archive
   ---------------------------------------------------------------- */
.archive-page { max-width: var(--content-max); margin: 0 auto; }
.page-heading {
  font-size: var(--text-2xl);
  font-weight: 800;
  margin-bottom: var(--space-8);
  display: flex;
  align-items: baseline;
  gap: var(--space-3);
}
.page-heading-count {
  font-size: var(--text-base);
  font-weight: 400;
  color: var(--color-text-muted);
}
.archive-year { margin-bottom: var(--space-8); }
.archive-year-title {
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-2);
  border-bottom: 2px solid var(--color-border);
}
.archive-month-title {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: .08em;
  margin: var(--space-4) 0 var(--space-2);
}
.archive-list { list-style: none; padding: 0; }
.archive-item {
  display: flex;
  align-items: baseline;
  gap: var(--space-4);
  padding: var(--space-2) 0;
  border-bottom: 1px dashed var(--color-border-light);
}
.archive-date {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  font-variant-numeric: tabular-nums;
  flex-shrink: 0;
  width: 2ch;
}
.archive-title {
  color: var(--color-text);
  font-size: var(--text-base);
  text-decoration: none;
  transition: color var(--transition);
}
.archive-title:hover { color: var(--color-primary); text-decoration: none; }

/* ----------------------------------------------------------------
   13. Tags Cloud
   ---------------------------------------------------------------- */
.tags-page, .tag-page { max-width: var(--content-max); margin: 0 auto; }
.tags-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-6);
}
.tag-cloud-item {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  text-decoration: none;
  transition: all var(--transition);
}
.tag-cloud-item:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
  background: var(--color-primary-light);
  text-decoration: none;
}
.tag-count {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  background: var(--color-bg-tertiary);
  padding: 1px 6px;
  border-radius: var(--radius-full);
}
.tag-name { color: var(--color-primary); }

/* ----------------------------------------------------------------
   14. Categories
   ---------------------------------------------------------------- */
.categories-page, .category-page { max-width: var(--content-max); margin: 0 auto; }
.categories-list { list-style: none; padding: 0; margin-top: var(--space-6); }
.category-item { border-bottom: 1px solid var(--color-border-light); }
.category-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-2);
  color: var(--color-text);
  text-decoration: none;
  transition: color var(--transition);
}
.category-link:hover { color: var(--color-primary); text-decoration: none; }
.category-name { font-weight: 500; }
.category-count {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  background: var(--color-bg-tertiary);
  padding: 2px 10px;
  border-radius: var(--radius-full);
}

/* ----------------------------------------------------------------
   15. Page (about, custom)
   ---------------------------------------------------------------- */
.page-article { max-width: var(--content-max); margin: 0 auto; }
.page-header { margin-bottom: var(--space-8); }
.page-title {
  font-size: var(--text-3xl);
  font-weight: 800;
  letter-spacing: -.02em;
}

/* ----------------------------------------------------------------
   16. Search Modal
   ---------------------------------------------------------------- */
.search-overlay {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(0,0,0,.5);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 10vh;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
}
.search-overlay.open {
  opacity: 1;
  pointer-events: all;
}
.search-modal {
  width: 100%;
  max-width: 600px;
  margin: 0 var(--space-4);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  transform: translateY(-20px);
  transition: transform var(--transition);
}
.search-overlay.open .search-modal { transform: translateY(0); }
.search-header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--color-border);
}
.search-input-wrap {
  flex: 1;
  display: flex;
  align-items: center;
  gap: var(--space-3);
}
.search-icon { color: var(--color-text-muted); flex-shrink: 0; }
.search-input {
  flex: 1;
  border: none;
  background: transparent;
  font-size: var(--text-base);
  color: var(--color-text);
  outline: none;
  font-family: var(--font-sans);
}
.search-input::placeholder { color: var(--color-text-muted); }
.search-close {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-text-muted);
  padding: var(--space-1);
  border-radius: var(--radius-sm);
  transition: color var(--transition);
}
.search-close:hover { color: var(--color-text); }
.search-results {
  max-height: 60vh;
  overflow-y: auto;
  padding: var(--space-4) var(--space-5);
}
.search-hint {
  text-align: center;
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  padding: var(--space-6) 0;
}
.search-result-item {
  display: block;
  padding: var(--space-4);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: background var(--transition);
  margin-bottom: var(--space-2);
}
.search-result-item:hover { background: var(--color-bg-secondary); text-decoration: none; }
.search-result-title {
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-1);
}
.search-result-title mark {
  background: transparent;
  color: var(--color-primary);
  font-weight: 700;
}
.search-result-excerpt {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.search-result-excerpt mark {
  background: rgba(37,99,235,.15);
  color: var(--color-primary);
  border-radius: 2px;
}
.search-no-result {
  text-align: center;
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  padding: var(--space-6) 0;
}

/* ----------------------------------------------------------------
   17. Lightbox
   ---------------------------------------------------------------- */
.lightbox-overlay {
  position: fixed;
  inset: 0;
  z-index: 300;
  background: rgba(0,0,0,.9);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: zoom-out;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-slow);
}
.lightbox-overlay.open { opacity: 1; pointer-events: all; }
.lightbox-img {
  max-width: 90vw;
  max-height: 90vh;
  object-fit: contain;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  transform: scale(.95);
  transition: transform var(--transition-slow);
}
.lightbox-overlay.open .lightbox-img { transform: scale(1); }
.lightbox-close {
  position: absolute;
  top: var(--space-5);
  right: var(--space-5);
  background: rgba(255,255,255,.15);
  border: none;
  color: #fff;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition);
}
.lightbox-close:hover { background: rgba(255,255,255,.25); }

/* ----------------------------------------------------------------
   18. Back to Top
   ---------------------------------------------------------------- */
.back-to-top {
  position: fixed;
  bottom: var(--space-8);
  right: var(--space-8);
  z-index: 50;
  width: 44px;
  height: 44px;
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  opacity: 0;
  transform: translateY(16px);
  pointer-events: none;
  transition: opacity var(--transition), transform var(--transition), background var(--transition);
}
.back-to-top.visible { opacity: 1; transform: translateY(0); pointer-events: all; }
.back-to-top:hover { background: var(--color-primary-hover); }

/* ----------------------------------------------------------------
   19. 404
   ---------------------------------------------------------------- */
.not-found {
  text-align: center;
  padding: var(--space-20) 0;
}
.not-found-code {
  font-size: 8rem;
  font-weight: 900;
  color: var(--color-border);
  line-height: 1;
  margin-bottom: var(--space-4);
}
.not-found-title {
  font-size: var(--text-3xl);
  font-weight: 700;
  margin-bottom: var(--space-4);
}
.not-found-desc {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-8);
}
.btn {
  display: inline-flex;
  align-items: center;
  padding: var(--space-3) var(--space-6);
  font-size: var(--text-base);
  font-weight: 600;
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: all var(--transition);
  cursor: pointer;
  border: none;
}
.btn-primary {
  background: var(--color-primary);
  color: #fff;
}
.btn-primary:hover {
  background: var(--color-primary-hover);
  color: #fff;
  text-decoration: none;
}

/* ----------------------------------------------------------------
   20. Comments
   ---------------------------------------------------------------- */
.comments-section { margin-top: var(--space-10); }
.comments-title {
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-3);
  border-bottom: 2px solid var(--color-border);
}

/* ----------------------------------------------------------------
   21. Responsive
   ---------------------------------------------------------------- */
@media (max-width: 768px) {
  :root { --header-height: 56px; }

  .container { padding: 0 var(--space-4); }
  .main-content { padding: var(--space-6) 0 var(--space-10); }

  /* Mobile nav */
  .hamburger { display: flex; }
  .site-nav {
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-4);
    display: none;
    box-shadow: var(--shadow-md);
  }
  .site-nav.open { display: block; }
  .nav-list { flex-direction: column; gap: var(--space-1); }
  .nav-link { padding: var(--space-3) var(--space-4); }

  .post-title { font-size: var(--text-2xl); }
  .post-nav { grid-template-columns: 1fr; }
  .post-series-header { flex-direction: column; }
  .post-series-nav { grid-template-columns: 1fr; }
  .post-series-nav-next { text-align: left; }
  .post-series-link-title { white-space: normal; }
  .back-to-top { bottom: var(--space-5); right: var(--space-5); }
  .pagination { gap: var(--space-2); }
  .page-numbers { display: none; }
}

@media (max-width: 480px) {
  .hero { grid-template-columns: minmax(0, 1fr) 84px; }
  .hero-photo { width: 84px; height: 84px; }
  .hero-greeting { font-size: 1.5rem; }
  .share-section { flex-direction: column; align-items: flex-start; }
  .not-found-code { font-size: 5rem; }
  .about-profile { flex-direction: column; align-items: center; text-align: center; }
  .about-links { justify-content: center; }
}

/* ----------------------------------------------------------------
   22. Utilities
   ---------------------------------------------------------------- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border-width: 0;
}

/* Scrollbar styling */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--color-border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--color-text-muted); }

/* Selection */
::selection { background: var(--color-primary); color: #fff; }

/* Focus visible */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  html { scroll-behavior: auto; }
}

/* Print */
@media print {
  .site-header, .site-footer, .back-to-top, .toc-wrap,
  .post-nav, .share-section, .comments-section { display: none !important; }
  body { font-size: 12pt; }
  .post-content a::after { content: " (" attr(href) ")"; font-size: .8em; }
}

/* ================================================================
   23. Hexo Native Code Highlight
   Hexo generates: figure.highlight.lang > table > tr > td.gutter + td.code
   ================================================================ */

figure.highlight {
  position: relative;
  margin: var(--space-6) 0;
  border-radius: 6px;
  overflow: hidden;
  max-width: 100%;
  background: #2d2d2d;
  font-size: var(--text-sm);
  line-height: 1.6;
}

/* Filename bar（仅在代码块指定文件名时出现） */
figure.highlight figcaption {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 5px var(--space-4);
  background: #1b1b1b;
  font-size: var(--text-xs);
  font-family: var(--font-mono);
  color: #999;
}
figure.highlight figcaption a { color: #999; }

figure.highlight table {
  width: 100%;
  border-collapse: collapse;
  display: block;
  overflow-x: auto;
  margin: 0;
  border: none;
}
figure.highlight table tr { background: transparent !important; }
figure.highlight table td { padding: 0; border: none; }

/* Gutter (line numbers) */
figure.highlight td.gutter {
  width: 1%;
  min-width: 40px;
  padding: var(--space-4) var(--space-3) var(--space-4) var(--space-4);
  background: #1b1b1b;
  border-right: 1px solid #3a3a3a;
  text-align: right;
  user-select: none;
  vertical-align: top;
}
figure.highlight td.gutter pre {
  background: transparent;
  padding: 0;
  margin: 0;
  border: none;
  box-shadow: none;
  border-radius: 0;
  overflow: visible;
}
figure.highlight .gutter .line {
  color: #666;
  font-family: var(--font-mono);
  font-size: .85em;
  line-height: calc(1.6 / 0.85);
  font-weight: 400;
}

/* Code area */
figure.highlight td.code {
  padding: var(--space-4) var(--space-5);
  vertical-align: top;
}
figure.highlight td.code pre {
  background: transparent;
  padding: 0;
  margin: 0;
  border: none;
  box-shadow: none;
  border-radius: 0;
  overflow: visible;
}
figure.highlight .code .line {
  color: #ccc;
  font-family: var(--font-mono);
  font-weight: 400;
  white-space: pre;
}
figure.highlight.code-wrap table { overflow-x: visible; }
figure.highlight.code-wrap .code .line {
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

/* Code toolbar */
figure.highlight .code-toolbar {
  position: absolute;
  top: var(--space-3);
  right: var(--space-3);
  display: flex;
  gap: var(--space-2);
  opacity: 0;
  z-index: 1;
  transition: opacity var(--transition);
}
figure.highlight:hover .code-toolbar,
figure.highlight:focus-within .code-toolbar { opacity: 1; }
figure.highlight .code-copy-btn,
figure.highlight .code-wrap-btn {
  position: static;
  opacity: 1;
  padding: 3px var(--space-3);
  font-size: var(--text-xs);
  font-family: var(--font-sans);
  color: #999;
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.12);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}
figure.highlight .code-copy-btn:hover,
figure.highlight .code-wrap-btn:hover { color: #fff; background: rgba(255,255,255,.15); }

/* ── Syntax token colors ── */
figure.highlight .comment,
figure.highlight .quote          { color: var(--hl-comment); font-style: italic; }

figure.highlight .keyword,
figure.highlight .selector-tag,
figure.highlight .addition       { color: var(--hl-keyword); }

figure.highlight .string,
figure.highlight .value,
figure.highlight .meta .meta-string,
figure.highlight .literal,
figure.highlight .doctag,
figure.highlight .regexp         { color: var(--hl-string); }

figure.highlight .number         { color: var(--hl-number); }

figure.highlight .title,
figure.highlight .section,
figure.highlight .name,
figure.highlight .selector-id,
figure.highlight .selector-class,
figure.highlight .variable,
figure.highlight .attribute,
figure.highlight .tag            { color: var(--hl-title); }

figure.highlight .class .title,
figure.highlight .type,
figure.highlight .template-variable,
figure.highlight .attr           { color: var(--hl-number); }

figure.highlight .symbol,
figure.highlight .bullet,
figure.highlight .subst,
figure.highlight .meta,
figure.highlight .meta .keyword,
figure.highlight .selector-attr,
figure.highlight .selector-pseudo,
figure.highlight .link           { color: var(--hl-symbol); }

figure.highlight .built_in,
figure.highlight .deletion       { color: var(--hl-number); }

figure.highlight .function,
figure.highlight .params         { color: var(--hl-function); }

figure.highlight .tag .name      { color: var(--hl-title); }
figure.highlight .tag .attr      { color: var(--hl-number); }

figure.highlight .operator,
figure.highlight .punctuation    { color: var(--hl-operator); }

/* No-gutter variant (when line_number: false) */
figure.highlight td.code:only-child {
  padding: var(--space-4) var(--space-5);
}

/* ----------------------------------------------------------------
   24. About Page
   ---------------------------------------------------------------- */
.about-profile {
  display: flex;
  align-items: flex-start;
  gap: var(--space-8);
  margin-bottom: var(--space-10);
  padding-bottom: var(--space-8);
  border-bottom: 1px solid var(--color-border);
}
.about-avatar-wrap { flex-shrink: 0; }
.about-avatar {
  width: 100px;
  height: 100px;
  border-radius: var(--radius-full);
  object-fit: cover;
  border: 3px solid var(--color-border);
}
.about-info { flex: 1; }
.about-name {
  font-size: var(--text-2xl);
  font-weight: 800;
  letter-spacing: -.02em;
  margin-bottom: var(--space-3);
}
.about-bio {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-5);
  line-height: var(--leading-normal);
}
.about-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}
.about-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: all var(--transition);
}
.about-link:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
  text-decoration: none;
}
.about-content { margin-top: var(--space-8); }

/* ----------------------------------------------------------------
   文章条目：左侧标题 + 两行摘要，右侧缩略图
   ---------------------------------------------------------------- */
.post-item {
  display: flex;
  align-items: center;
  gap: var(--space-5);
}

.post-item-body {
  flex: 1 1 auto;
  min-width: 0;
}

.post-item-excerpt {
  margin: 0 0 var(--space-2);
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  line-height: var(--leading-normal);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  word-break: break-word;
}

.post-item-thumb {
  flex: 0 0 168px;
  width: 168px;
  height: 112px;
  display: block;
  overflow: hidden;
  border-radius: var(--radius-md);
  background: var(--color-bg-tertiary);
}

.post-item-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform .4s ease;
}

.post-item:hover .post-item-thumb img { transform: scale(1.04); }

@media (max-width: 768px) {
  .post-item { gap: var(--space-4); }
  .post-item-thumb { flex-basis: 116px; width: 116px; height: 82px; }
}

@media (max-width: 480px) {
  .post-item-thumb { flex-basis: 92px; width: 92px; height: 68px; }
  .post-item-title { font-size: var(--text-base); }
}

/* ----------------------------------------------------------------
   首页 Hero：左侧问候语 + 简介 + 社交图标，右侧照片
   ---------------------------------------------------------------- */
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  align-items: center;
  gap: var(--space-10);
  max-width: var(--content-max);
  margin: 0 auto var(--space-10);
}

.hero-greeting {
  margin: 0 0 var(--space-4);
  font-size: clamp(2.4rem, 5.5vw, 3.6rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--color-text);
}

.hero-tagline {
  margin: 0 0 var(--space-4);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text);
}

.hero-bio {
  margin: 0 0 var(--space-6);
  max-width: 48ch;
  font-size: var(--text-base);
  line-height: var(--leading-loose);
  color: var(--color-text-secondary);
  white-space: pre-line;
}

.hero-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-4);
}

.hero-link {
  display: inline-flex;
  color: var(--color-text-secondary);
  transition: transform var(--transition), opacity var(--transition);
  opacity: .9;
}
.hero-link:hover { transform: translateY(-2px); opacity: 1; }
.hero-link-rss     { color: #f26522; }
.hero-link-x       { color: #111111; }
.hero-link-github  { color: #181717; }
.hero-link-email   { color: #ea4335; }
.hero-link-website { color: #2563eb; }

/* 桌面端照片固定 300×300 */
.hero-photo {
  width: 300px;
  height: 300px;
}

.hero-photo img,
.hero-photo-fallback {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 20px;
  background: var(--color-bg-tertiary);
}

.hero-photo-fallback {
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #f8fafc 0%, #e5e7eb 100%);
}

.hero-photo-fallback span {
  font-size: var(--text-2xl);
  font-weight: 800;
  letter-spacing: .12em;
  color: #b6bcc6;
}

/* 深色模式下的图标与占位底色 */
[data-theme="dark"] .hero-link-x,
[data-theme="dark"] .hero-link-github { color: #e5e7eb; }

[data-theme="dark"] .hero-photo-fallback {
  background: linear-gradient(135deg, #1f2430 0%, #2b303b 100%);
}
[data-theme="dark"] .hero-photo-fallback span { color: #4b5563; }

@media (max-width: 900px) {
  .hero { grid-template-columns: minmax(0, 1fr) 260px; gap: var(--space-6); }
  .hero-photo { width: 260px; height: 260px; }
}

@media (max-width: 768px) {
  /* 头部操作按钮靠右（移动端导航被收进抽屉，nav 的 margin-left:auto 失效） */
  .header-actions { margin-left: auto; }
  .brand-title { font-size: var(--text-base); }

  /* Hero：小头像放右侧，与文字同排，不再单独占一行 */
  .hero { grid-template-columns: minmax(0, 1fr) 104px; align-items: start; gap: var(--space-4); }
  .hero-photo { width: 104px; height: 104px; }
  .hero-photo img,
  .hero-photo-fallback { height: 100%; }
  .hero-greeting { font-size: 1.75rem; margin-bottom: var(--space-2); }
  .hero-tagline { font-size: var(--text-base); margin-bottom: var(--space-2); }
  .hero-bio { font-size: var(--text-sm); line-height: 1.7; margin-bottom: var(--space-3); }
  .hero-links { gap: var(--space-3); }
}