/* ============================================
   文章详情页 - 现代化设计系统
   设计原则: 排版优先 / 极简现代 / 暗色完整覆盖
   ============================================ */

/* ===== CSS Custom Properties ===== */
:root {
  /* Colors - Light */
  --article-bg: #fefefe;
  --article-bg-hero: #fafaf9;
  --article-ink: #1a1a2e;
  --article-ink-soft: #4a4a5a;
  --article-ink-muted: #8a8a9a;
  --article-accent: #ff6b35;
  --article-accent-hover: #e55a2b;
  --article-accent-soft: rgba(255, 107, 53, 0.10);
  --article-line: rgba(26, 26, 46, 0.08);
  --article-line-strong: rgba(26, 26, 46, 0.15);
  --article-radius: 8px;
  --article-radius-sm: 4px;
  --article-radius-lg: 12px;
  --article-radius-xl: 16px;
  --article-shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --article-shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --article-shadow-lg: 0 10px 30px rgba(0,0,0,0.10);
  --article-code-bg: #f4f4f5;
  --article-code-ink: #1a1a2e;
  --article-code-comment: #6a737d;
  --article-code-keyword: #d73a49;
  --article-code-string: #032f62;
  --article-code-number: #005cc5;
  --article-code-function: #6f42c1;
  --article-code-tag: #22863a;
  --article-code-attr: #6f42c1;
  --article-code-punctuation: #24292e;
  --article-blockquote-bg: #f9fafb;
  --article-tag-bg: rgba(255, 107, 53, 0.08);
  --article-tag-ink: #ff6b35;
  --article-font-serif: "Noto Serif SC", "Source Han Serif SC", Georgia, "Times New Roman", serif;
  --article-font-mono: "JetBrains Mono", "Fira Code", "Cascadia Code", Consolas, "Courier New", monospace;
  --article-content-width: 720px;
  --article-toc-width: 220px;
  --article-hero-gradient: linear-gradient(135deg, #f8f7f4 0%, #f0ede6 50%, #faf8f5 100%);
  --article-card-bg: #ffffff;
  --article-card-border: rgba(26, 26, 46, 0.06);
}

/* ===== Dark Mode Overrides ===== */
[data-theme="dark"] {
  --article-bg: #111118;
  --article-bg-hero: #15151e;
  --article-ink: #e4e4eb;
  --article-ink-soft: #b0b0ba;
  --article-ink-muted: #6e6e7a;
  --article-accent: #ff9060;
  --article-accent-hover: #ffa880;
  --article-accent-soft: rgba(255, 144, 96, 0.10);
  --article-line: rgba(228, 228, 235, 0.08);
  --article-line-strong: rgba(228, 228, 235, 0.15);
  --article-shadow: 0 1px 3px rgba(0,0,0,0.20), 0 1px 2px rgba(0,0,0,0.15);
  --article-shadow-md: 0 4px 12px rgba(0,0,0,0.30);
  --article-shadow-lg: 0 10px 30px rgba(0,0,0,0.40);
  --article-code-bg: #1e1e2e;
  --article-code-ink: #e4e4eb;
  --article-code-comment: #8b949e;
  --article-code-keyword: #ff7b72;
  --article-code-string: #a5d6ff;
  --article-code-number: #79c0ff;
  --article-code-function: #d2a8ff;
  --article-code-tag: #7ee787;
  --article-code-attr: #d2a8ff;
  --article-code-punctuation: #c9d1d9;
  --article-blockquote-bg: #181825;
  --article-tag-bg: rgba(255, 144, 96, 0.10);
  --article-tag-ink: #ff9060;
  --article-hero-gradient: linear-gradient(135deg, #111118 0%, #181825 50%, #15151e 100%);
  --article-card-bg: #1a1a24;
  --article-card-border: rgba(228, 228, 235, 0.06);
}

/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; }

body {
  margin: 0;
  padding: 0;
  background: var(--article-bg);
  color: var(--article-ink);
  font-family: var(--article-font-serif);
  font-size: 18px;
  line-height: 1.8;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ===== Reading Progress Bar ===== */
.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  background: var(--article-accent);
  z-index: 1000;
  transition: width 80ms linear;
  border-radius: 0 2px 2px 0;
}

/* ===== Sticky Topbar ===== */
.article-topbar {
  position: sticky;
  top: 0;
  z-index: 500;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
  padding: 0 24px;
  background: rgba(254, 254, 254, 0.85);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border-bottom: 1px solid var(--article-line);
  transition: background 0.3s ease, border-color 0.3s ease;
}

[data-theme="dark"] .article-topbar {
  background: rgba(17, 17, 24, 0.85);
}

.topbar-back {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--article-ink-soft);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  transition: color 0.2s ease;
  white-space: nowrap;
}

.topbar-back:hover { color: var(--article-accent); }

.topbar-back svg {
  transition: transform 0.2s ease;
}

.topbar-back:hover svg {
  transform: translateX(-3px);
}

.topbar-center {
  flex: 1;
  text-align: center;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 13px;
  color: var(--article-ink-muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  padding: 0 16px;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.topbar-center.visible { opacity: 1; }

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  padding: 0;
  background: transparent;
  border: 1px solid var(--article-line-strong);
  border-radius: 50%;
  cursor: pointer;
  color: var(--article-ink-soft);
  transition: all 0.2s ease;
}

.theme-toggle:hover {
  background: var(--article-accent-soft);
  border-color: var(--article-accent);
  color: var(--article-accent);
}

.theme-toggle svg { width: 18px; height: 18px; }

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

/* ===== Hero Section ===== */
.article-hero {
  position: relative;
  background: var(--article-hero-gradient);
  border-bottom: 1px solid var(--article-line);
  overflow: hidden;
}

.article-hero.has-cover {
  min-height: 400px;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: calc(var(--article-content-width) + 64px);
  margin: 0 auto;
  padding: 80px 32px 64px;
  text-align: center;
}

.article-hero.has-cover .hero-content {
  color: #ffffff;
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.article-title {
  font-family: var(--article-font-serif);
  font-size: clamp(28px, 5vw, 42px);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.01em;
  margin: 0 0 32px;
  color: var(--article-ink);
}

[data-theme="dark"] .article-title { color: #f0f0f5; }

.article-hero.has-cover .article-title {
  color: #ffffff;
}

/* ===== Metadata Card ===== */
.article-meta-card {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 12px 24px;
  padding: 20px 32px;
  background: var(--article-card-bg);
  border: 1px solid var(--article-card-border);
  border-radius: var(--article-radius-lg);
  box-shadow: var(--article-shadow);
}

[data-theme="dark"] .article-meta-card {
  background: #1a1a24;
  border-color: rgba(228, 228, 235, 0.06);
}

.meta-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 14px;
  color: var(--article-ink-soft);
  white-space: nowrap;
}

.meta-item svg {
  width: 15px;
  height: 15px;
  color: var(--article-ink-muted);
  flex-shrink: 0;
}

.meta-divider {
  width: 1px;
  height: 16px;
  background: var(--article-line-strong);
  flex-shrink: 0;
}

.meta-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.article-tag {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  background: var(--article-tag-bg);
  color: var(--article-tag-ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 12px;
  font-weight: 600;
  border-radius: 100px;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

/* ===== Hero Cover Image ===== */
.hero-cover {
  position: absolute;
  inset: 0;
  z-index: 1;
}

.hero-cover::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(0,0,0,0.35) 0%, rgba(0,0,0,0.55) 100%);
}

.hero-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* ===== Main Layout (Content + TOC) ===== */
.article-main {
  display: flex;
  max-width: calc(var(--article-content-width) + var(--article-toc-width) + 120px);
  margin: 0 auto;
  padding: 48px 24px;
  gap: 48px;
}

/* ===== TOC Sidebar ===== */
.toc-sidebar {
  width: var(--article-toc-width);
  flex-shrink: 0;
  position: sticky;
  top: 80px;
  align-self: flex-start;
  max-height: calc(100vh - 120px);
  overflow-y: auto;
  padding-right: 12px;
  scrollbar-width: thin;
  scrollbar-color: var(--article-line-strong) transparent;
}

.toc-sidebar::-webkit-scrollbar { width: 4px; }
.toc-sidebar::-webkit-scrollbar-track { background: transparent; }
.toc-sidebar::-webkit-scrollbar-thumb {
  background: var(--article-line-strong);
  border-radius: 2px;
}

.toc-title {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--article-ink-muted);
  margin: 0 0 16px;
}

.toc-nav {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.toc-link {
  display: block;
  padding: 5px 12px;
  color: var(--article-ink-muted);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 13px;
  text-decoration: none;
  border-radius: 4px;
  border-left: 2px solid transparent;
  transition: all 0.2s ease;
  line-height: 1.5;
}

.toc-link:hover {
  color: var(--article-ink-soft);
  background: var(--article-accent-soft);
}

.toc-link.active {
  color: var(--article-accent);
  background: var(--article-accent-soft);
  border-left-color: var(--article-accent);
  font-weight: 600;
}

.toc-link.toc-h3 {
  padding-left: 28px;
  font-size: 12px;
}

/* ===== Article Body Wrapper ===== */
.article-body-wrap {
  flex: 1;
  min-width: 0;
}

/* ===== Article Content Typography ===== */
.article-content {
  font-family: var(--article-font-serif);
  font-size: 18px;
  line-height: 1.8;
  color: var(--article-ink);
  word-break: break-word;
}

.article-content > *:first-child { margin-top: 0 !important; }

/* Headings */
.article-content h1,
.article-content h2,
.article-content h3,
.article-content h4 {
  font-family: var(--article-font-serif);
  font-weight: 700;
  line-height: 1.3;
  margin: 2.5em 0 0.75em;
  color: var(--article-ink);
  scroll-margin-top: 80px;
}

.article-content h1 { font-size: 1.75em; }
.article-content h2 { font-size: 1.5em; }
.article-content h3 { font-size: 1.25em; }
.article-content h4 { font-size: 1.1em; }

/* Paragraphs */
.article-content p {
  margin: 0 0 1.5em;
  text-align: justify;
  hyphens: none;
}

/* Links */
.article-content a {
  color: var(--article-accent);
  text-decoration: none;
  border-bottom: 1px solid var(--article-accent-soft);
  transition: all 0.2s ease;
}

.article-content a:hover {
  color: var(--article-accent-hover);
  border-bottom-color: var(--article-accent-hover);
}

/* Bold / Strong */
.article-content strong {
  font-weight: 700;
  color: var(--article-ink);
}

/* Lists */
.article-content ul, .article-content ol {
  margin: 1em 0 1.5em;
  padding-left: 1.5em;
}

.article-content li {
  margin: 0.35em 0;
}

.article-content li::marker {
  color: var(--article-accent);
}

/* Blockquote */
.article-content blockquote {
  margin: 2em 0;
  padding: 20px 28px;
  background: var(--article-blockquote-bg);
  border-left: 4px solid var(--article-accent);
  border-radius: 0 var(--article-radius) var(--article-radius) 0;
  font-style: italic;
  color: var(--article-ink-soft);
}

.article-content blockquote p {
  margin: 0;
}

.article-content blockquote p + p {
  margin-top: 1em;
}

/* Horizontal Rule */
.article-content hr {
  margin: 3em 0;
  border: none;
  height: 1px;
  background: var(--article-line);
}

/* Images */
.article-content img {
  max-width: 100%;
  height: auto;
  margin: 2em auto;
  display: block;
  border-radius: var(--article-radius-lg);
  box-shadow: var(--article-shadow-md);
}

.article-content figure {
  margin: 2em 0;
}

.article-content figcaption {
  margin-top: 0.75em;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 13px;
  color: var(--article-ink-muted);
  text-align: center;
  font-style: italic;
}

/* ===== Custom Code Blocks ===== */

/* Inline code */
.article-content code:not([class*="language-"]) {
  padding: 0.15em 0.45em;
  margin: 0 0.1em;
  background: var(--article-code-bg);
  border-radius: var(--article-radius-sm);
  font-family: var(--article-font-mono);
  font-size: 0.85em;
  color: var(--article-accent);
  font-weight: 500;
}

/* Code blocks container */
.article-content pre[class*="language-"] {
  position: relative;
  margin: 2em 0;
  padding: 0;
  background: var(--article-code-bg);
  border-radius: var(--article-radius-lg);
  overflow: hidden;
  box-shadow: var(--article-shadow);
}

.article-content pre[class*="language-"] code[class*="language-"] {
  display: block;
  padding: 24px;
  overflow-x: auto;
  font-family: var(--article-font-mono);
  font-size: 14px;
  line-height: 1.7;
  color: var(--article-code-ink);
  background: transparent;
  tab-size: 4;
}

.article-content pre[class*="language-"] code[class*="language-"]::-webkit-scrollbar { height: 6px; }
.article-content pre[class*="language-"] code[class*="language-"]::-webkit-scrollbar-track { background: transparent; }
.article-content pre[class*="language-"] code[class*="language-"]::-webkit-scrollbar-thumb {
  background: var(--article-line-strong);
  border-radius: 3px;
}

/* Code block header bar */
.code-block-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 16px;
  background: rgba(0, 0, 0, 0.04);
  border-bottom: 1px solid var(--article-line);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

[data-theme="dark"] .code-block-header {
  background: rgba(255, 255, 255, 0.04);
}

.code-lang-label {
  font-size: 11px;
  font-weight: 600;
  color: var(--article-ink-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.code-copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  background: transparent;
  border: 1px solid var(--article-line-strong);
  border-radius: var(--article-radius-sm);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 11px;
  color: var(--article-ink-muted);
  cursor: pointer;
  transition: all 0.2s ease;
}

.code-copy-btn:hover {
  background: var(--article-accent-soft);
  border-color: var(--article-accent);
  color: var(--article-accent);
}

.code-copy-btn svg {
  width: 13px;
  height: 13px;
}

/* Syntax highlighting tokens */
.token.comment,
.token.prolog,
.token.doctype,
.token.cdata { color: var(--article-code-comment); font-style: italic; }

.token.punctuation { color: var(--article-code-punctuation); }

.token.namespace { opacity: 0.7; }

.token.property,
.token.tag,
.token.boolean,
.token.number,
.token.constant,
.token.symbol,
.token.deleted { color: var(--article-code-number); }

.token.selector,
.token.attr-name,
.token.string,
.token.char,
.token.builtin,
.token.inserted { color: var(--article-code-string); }

.token.operator,
.token.entity,
.token.url { color: var(--article-code-punctuation); }

.token.atrule,
.token.attr-value,
.token.keyword { color: var(--article-code-keyword); }

.token.function,
.token.class-name { color: var(--article-code-function); }

.token.regex,
.token.important,
.token.variable { color: var(--article-code-tag); }

.token.important,
.token.bold { font-weight: bold; }
.token.italic { font-style: italic; }

/* ===== Table Styles ===== */
.article-content table {
  width: 100%;
  margin: 2em 0;
  border-collapse: collapse;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 14px;
  border-radius: var(--article-radius-lg);
  overflow: hidden;
  box-shadow: var(--article-shadow);
}

.article-content thead {
  background: var(--article-accent-soft);
}

.article-content th {
  padding: 12px 16px;
  text-align: left;
  font-weight: 600;
  color: var(--article-ink);
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.article-content td {
  padding: 12px 16px;
  border-top: 1px solid var(--article-line);
  color: var(--article-ink-soft);
}

.article-content tr:nth-child(even) td {
  background: rgba(0, 0, 0, 0.015);
}

[data-theme="dark"] .article-content tr:nth-child(even) td {
  background: rgba(255, 255, 255, 0.02);
}

/* ===== Article Footer ===== */
.article-footer {
  margin-top: 64px;
  padding-top: 32px;
  border-top: 1px solid var(--article-line);
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 24px;
}

.footer-back-home {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--article-ink-muted);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  transition: color 0.2s ease;
}

.footer-back-home:hover { color: var(--article-accent); }
.footer-back-home svg { transition: transform 0.2s ease; }
.footer-back-home:hover svg { transform: translateX(-3px); }

.footer-share {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 13px;
  color: var(--article-ink-muted);
  display: flex;
  align-items: center;
  gap: 8px;
}

.footer-share-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border: 1px solid var(--article-line-strong);
  border-radius: 50%;
  cursor: pointer;
  color: var(--article-ink-muted);
  background: transparent;
  transition: all 0.2s ease;
}

.footer-share-btn:hover {
  background: var(--article-accent-soft);
  border-color: var(--article-accent);
  color: var(--article-accent);
}

.footer-share-btn svg { width: 14px; height: 14px; }

/* ===== Back to Top FAB ===== */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  z-index: 400;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--article-card-bg);
  border: 1px solid var(--article-line-strong);
  border-radius: 50%;
  box-shadow: var(--article-shadow-md);
  cursor: pointer;
  color: var(--article-ink-muted);
  opacity: 0;
  transform: translateY(16px) scale(0.9);
  pointer-events: none;
  transition: all 0.3s ease;
}

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

.back-to-top:hover {
  background: var(--article-accent);
  border-color: var(--article-accent);
  color: #ffffff;
  box-shadow: 0 4px 16px rgba(255, 107, 53, 0.35);
  transform: translateY(-2px) scale(1);
}

[data-theme="dark"] .back-to-top:hover {
  box-shadow: 0 4px 16px rgba(255, 144, 96, 0.25);
}

.back-to-top svg { width: 20px; height: 20px; }

/* ===== Fade-in Animations ===== */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-in-delay-1 { transition-delay: 100ms; }
.fade-in-delay-2 { transition-delay: 200ms; }
.fade-in-delay-3 { transition-delay: 300ms; }

/* ===== Loading & Error States ===== */
.article-loading {
  text-align: center;
  padding: 80px 32px;
  color: var(--article-ink-muted);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 15px;
}

.article-loading .loading-dots {
  display: inline-flex;
  gap: 4px;
  margin-top: 16px;
}

.article-loading .loading-dots span {
  width: 6px;
  height: 6px;
  background: var(--article-accent);
  border-radius: 50%;
  animation: dotPulse 1.4s infinite ease-in-out;
}

.article-loading .loading-dots span:nth-child(2) { animation-delay: 0.16s; }
.article-loading .loading-dots span:nth-child(3) { animation-delay: 0.32s; }

@keyframes dotPulse {
  0%, 80%, 100% { opacity: 0.3; transform: scale(0.8); }
  40% { opacity: 1; transform: scale(1); }
}

.article-error {
  text-align: center;
  padding: 80px 32px;
  color: var(--article-ink-muted);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

.article-error .error-emoji {
  font-size: 64px;
  margin-bottom: 16px;
  display: block;
}

.article-error .error-message {
  font-size: 16px;
  margin-bottom: 24px;
  color: var(--article-ink-soft);
}

.article-error a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 24px;
  background: var(--article-accent);
  color: #ffffff;
  border-radius: 100px;
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
  transition: all 0.2s ease;
}

.article-error a:hover {
  background: var(--article-accent-hover);
  transform: translateY(-1px);
}

/* ===== Toast Notifications ===== */
.toast-container {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2000;
  display: flex;
  flex-direction: column-reverse;
  gap: 8px;
}

.toast {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 18px;
  background: var(--article-card-bg);
  border: 1px solid var(--article-line);
  border-radius: 100px;
  box-shadow: var(--article-shadow-lg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 13px;
  color: var(--article-ink-soft);
  animation: toastIn 0.3s ease;
}

@keyframes toastIn {
  from { opacity: 0; transform: translateY(12px) scale(0.95); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

/* ===== Responsive ===== */

/* Hide TOC on smaller screens */
@media (max-width: 1024px) {
  .toc-sidebar { display: none; }

  .article-main {
    max-width: var(--article-content-width);
    padding: 40px 20px;
  }

  .hero-content {
    padding: 60px 24px 48px;
  }

  .article-meta-card {
    padding: 16px 24px;
    gap: 8px 16px;
  }

  .meta-divider {
    display: none;
  }
}

/* Mobile adjustments */
@media (max-width: 640px) {
  body { font-size: 16px; }

  .reading-progress { height: 2px; }

  .article-topbar {
    padding: 0 16px;
    height: 48px;
  }

  .topbar-center { display: none; }

  .hero-content {
    padding: 48px 16px 36px;
  }

  .article-title {
    font-size: 24px;
    margin-bottom: 24px;
  }

  .article-meta-card {
    padding: 14px 18px;
    border-radius: var(--article-radius);
    gap: 6px 12px;
  }

  .meta-item { font-size: 12px; }
  .meta-item svg { width: 13px; height: 13px; }

  .article-main {
    padding: 32px 16px;
    gap: 0;
  }

  .article-content { font-size: 16px; }

  .article-content pre[class*="language-"] code[class*="language-"] {
    padding: 16px;
    font-size: 12px;
  }

  .code-block-header { padding: 6px 12px; }

  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
  }

  .footer-nav {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* Print styles */
@media print {
  .article-topbar,
  .toc-sidebar,
  .reading-progress,
  .back-to-top,
  .toast-container { display: none !important; }

  body { background: #fff; color: #000; font-size: 14px; }
  .article-hero { background: none; border-bottom: 1px solid #ccc; }
  .hero-content { padding: 20px 0; }
}