/* ==========================================================================
   TzdLang Official Wiki — "From Beginner to Master" (从入门到精通)
   Aesthetic: Apple Developer & HIG Dark Minimalism
   Fluid Physics Motion: cubic-bezier(0.23, 1, 0.32, 1)
   ========================================================================== */

:root {
  /* Canvas & Elevated Surfaces */
  --apple-canvas: #0c0e14;
  --apple-surface: #12151e;
  --apple-surface-elevated: #161a26;
  --apple-surface-card: rgba(20, 24, 35, 0.7);
  --apple-surface-hover: rgba(255, 255, 255, 0.04);
  --apple-surface-active: rgba(41, 151, 255, 0.1);
  --apple-code-bg: #10131c;

  /* Borders */
  --apple-border: rgba(255, 255, 255, 0.07);
  --apple-border-subtle: rgba(255, 255, 255, 0.04);
  --apple-border-elevated: rgba(255, 255, 255, 0.12);
  --apple-border-active: rgba(41, 151, 255, 0.4);

  /* Typography Colors */
  --apple-text-primary: #f5f5f7;
  --apple-text-secondary: #9aa1b0;
  --apple-text-tertiary: #636b7b;
  --apple-text-accent: #2997ff;

  /* Unified Accents */
  --apple-blue: #2997ff;
  --apple-blue-hover: #0077ed;
  --apple-blue-subtle: rgba(41, 151, 255, 0.12);
  --apple-green: #34d399;
  --apple-amber: #f59e0b;
  --apple-purple: #a78bfa;

  /* Fonts & Typographic Hierarchy */
  --apple-font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "SF Pro", "Inter", -apple-system, sans-serif;
  --apple-font-mono: "SF Mono", Menlo, Monaco, "Cascadia Code", "JetBrains Mono", Consolas, monospace;

  /* Easing & Physics */
  --apple-ease: cubic-bezier(0.23, 1, 0.32, 1);
  --apple-ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Dimensions */
  --header-h: 56px;
  --sidebar-w: 280px;
  --toc-w: 240px;
}

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

html {
  scroll-behavior: smooth;
  background-color: var(--apple-canvas);
  color: var(--apple-text-primary);
  font-family: var(--apple-font-sans);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  background-color: var(--apple-canvas);
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  line-height: 1.75;
  color: var(--apple-text-secondary);
}

/* Top Slim Reading Progress Bar */
#reading-progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  width: 0%;
  background: linear-gradient(90deg, #2997ff 0%, #5ac8fa 50%, #34d399 100%);
  z-index: 10000;
  transition: width 0.12s ease-out;
  pointer-events: none;
}

/* ==========================================================================
   Top Sticky Navigation Bar (Apple Frosted Glass)
   ========================================================================== */
.wiki-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-h);
  background: rgba(12, 14, 20, 0.76);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  border-bottom: 1px solid var(--apple-border);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  transition: background-color 0.3s var(--apple-ease);
}

.wiki-header-left {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.brand-wrapper {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  color: inherit;
  transition: opacity 0.2s var(--apple-ease);
}

.brand-wrapper:hover {
  opacity: 0.88;
}

.brand-icon {
  width: 26px;
  height: 26px;
  border-radius: 7px;
  background: linear-gradient(135deg, #0071e3 0%, #0056b3 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  box-shadow: 0 2px 8px rgba(0, 113, 227, 0.35);
}

.brand-name {
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--apple-text-primary);
  letter-spacing: -0.015em;
}

.version-badge {
  font-size: 0.7rem;
  font-family: var(--apple-font-mono);
  padding: 0.15rem 0.55rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--apple-border);
  border-radius: 9999px;
  color: var(--apple-text-tertiary);
  font-weight: 500;
}

.breadcrumb-nav {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.82rem;
  color: var(--apple-text-tertiary);
}

.breadcrumb-nav a {
  color: var(--apple-text-tertiary);
  text-decoration: none;
  transition: color 0.15s var(--apple-ease);
}

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

.breadcrumb-active {
  color: var(--apple-text-secondary);
  font-weight: 500;
}

/* Apple Spotlight Style Search Input */
.wiki-search-box {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--apple-border);
  padding: 0.38rem 0.85rem;
  border-radius: 10px;
  width: 290px;
  transition: width 0.3s var(--apple-ease), background 0.25s var(--apple-ease), border-color 0.25s var(--apple-ease), box-shadow 0.25s var(--apple-ease);
}

.wiki-search-box svg {
  color: var(--apple-text-tertiary);
  flex-shrink: 0;
  transition: color 0.2s var(--apple-ease);
}

.wiki-search-box input {
  background: none;
  border: none;
  outline: none;
  color: var(--apple-text-primary);
  font-family: var(--apple-font-sans);
  font-size: 0.825rem;
  width: 100%;
}

.wiki-search-box input::placeholder {
  color: var(--apple-text-tertiary);
}

.wiki-search-box kbd {
  font-family: var(--apple-font-mono);
  font-size: 0.65rem;
  padding: 0.15rem 0.38rem;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--apple-border);
  border-radius: 5px;
  color: var(--apple-text-tertiary);
  transition: transform 0.2s var(--apple-ease), color 0.2s var(--apple-ease);
}

.wiki-search-box:focus-within {
  width: 350px;
  background: rgba(255, 255, 255, 0.07);
  border-color: rgba(41, 151, 255, 0.45);
  box-shadow: 0 0 0 3px rgba(41, 151, 255, 0.12), 0 4px 16px rgba(0, 0, 0, 0.3);
}

.wiki-search-box:focus-within svg {
  color: var(--apple-blue);
}

.wiki-search-box:focus-within kbd {
  transform: scale(0.92);
  color: var(--apple-text-secondary);
}

/* Header Right Actions */
.wiki-header-right {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.header-link {
  font-size: 0.84rem;
  color: var(--apple-text-secondary);
  text-decoration: none;
  padding: 0.4rem 0.8rem;
  border-radius: 8px;
  font-weight: 500;
  transition: color 0.18s var(--apple-ease), background 0.18s var(--apple-ease);
}

.header-link:hover {
  color: var(--apple-text-primary);
  background: var(--apple-surface-hover);
}

.btn-dl-header {
  background: var(--apple-blue);
  color: #fff;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.4rem 0.95rem;
  border-radius: 8px;
  font-size: 0.82rem;
  text-decoration: none;
  box-shadow: 0 1px 4px rgba(41, 151, 255, 0.3);
  transition: background-color 0.2s var(--apple-ease), transform 0.2s var(--apple-ease), box-shadow 0.2s var(--apple-ease);
}

.btn-dl-header:hover {
  background: var(--apple-blue-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(41, 151, 255, 0.4);
}

/* Hamburger button for mobile */
.btn-mobile-sidebar {
  display: none;
  background: none;
  border: none;
  color: var(--apple-text-primary);
  cursor: pointer;
  padding: 0.35rem;
}

/* ==========================================================================
   Documentation Grid Layout (Apple Negative Space & Precision)
   ========================================================================== */
.wiki-layout {
  display: flex;
  margin-top: var(--header-h);
  min-height: calc(100vh - var(--header-h));
  max-width: 1540px;
  margin-left: auto;
  margin-right: auto;
  position: relative;
}

/* Left Sidebar (Frosted Glass Navigator) */
.wiki-sidebar {
  width: var(--sidebar-w);
  flex-shrink: 0;
  position: sticky;
  top: var(--header-h);
  height: calc(100vh - var(--header-h));
  overflow-y: auto;
  border-right: 1px solid var(--apple-border);
  background: rgba(12, 14, 20, 0.4);
  padding: 2rem 1.15rem 4rem 1.5rem;
  scrollbar-width: thin;
  scrollbar-color: rgba(255, 255, 255, 0.1) transparent;
}

.wiki-sidebar::-webkit-scrollbar {
  width: 4px;
}

.wiki-sidebar::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.12);
  border-radius: 4px;
}

.sidebar-group-title {
  font-family: var(--apple-font-sans);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--apple-text-tertiary);
  text-transform: uppercase;
  margin: 1.75rem 0 0.55rem 0.55rem;
}

.sidebar-group-title:first-child {
  margin-top: 0.2rem;
}

.sidebar-nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.sidebar-link {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.52rem 0.75rem;
  border-radius: 8px;
  color: var(--apple-text-secondary);
  font-size: 0.84rem;
  text-decoration: none;
  transition: all 0.22s var(--apple-ease);
  line-height: 1.4;
  position: relative;
}

.sidebar-link:hover {
  color: var(--apple-text-primary);
  background: var(--apple-surface-hover);
}

.sidebar-link.active {
  color: var(--apple-blue);
  background: var(--apple-blue-subtle);
  font-weight: 600;
}

.sidebar-link.active::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 20%;
  bottom: 20%;
  width: 3px;
  border-radius: 3px;
  background: var(--apple-blue);
  box-shadow: 0 0 8px rgba(41, 151, 255, 0.5);
}

.sidebar-link-num {
  font-family: var(--apple-font-mono);
  font-size: 0.72rem;
  opacity: 0.55;
  flex-shrink: 0;
}

/* ==========================================================================
   Center Article Area (Spacious Breathing Room)
   ========================================================================== */
.wiki-main {
  flex: 1;
  min-width: 0;
  padding: 3.5rem 4.5rem 8rem 4.5rem;
  max-width: 940px;
}

/* Right TOC Navigator */
.wiki-toc-wrapper {
  width: var(--toc-w);
  flex-shrink: 0;
  position: sticky;
  top: var(--header-h);
  height: calc(100vh - var(--header-h));
  overflow-y: auto;
  padding: 2.75rem 1.5rem 2rem 1.5rem;
  border-left: 1px solid var(--apple-border);
}

.toc-title {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--apple-text-tertiary);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.toc-nav-container {
  position: relative;
}

/* Apple Fluid Active Sliding Track Indicator */
.toc-track-line {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: rgba(255, 255, 255, 0.06);
  border-radius: 2px;
}

.toc-active-pill {
  position: absolute;
  left: 0;
  width: 2px;
  height: 24px;
  background: var(--apple-blue);
  border-radius: 2px;
  box-shadow: 0 0 10px rgba(41, 151, 255, 0.6);
  transition: transform 0.3s var(--apple-ease), opacity 0.2s var(--apple-ease);
  opacity: 0;
  pointer-events: none;
}

.toc-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding-left: 0.85rem;
}

.toc-item a {
  font-size: 0.81rem;
  color: var(--apple-text-tertiary);
  text-decoration: none;
  display: block;
  padding: 0.25rem 0.5rem;
  border-radius: 6px;
  transition: color 0.2s var(--apple-ease), background 0.2s var(--apple-ease);
  line-height: 1.45;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.toc-item a:hover {
  color: var(--apple-text-primary);
}

.toc-item.active a {
  color: var(--apple-blue);
  font-weight: 500;
}

/* ==========================================================================
   Article Hierarchy & Typographic Detail
   ========================================================================== */
.wiki-article {
  margin-bottom: 5.5rem;
  padding-bottom: 4.5rem;
  border-bottom: 1px solid var(--apple-border-subtle);
  position: relative;
}

.wiki-article:last-child {
  border-bottom: none;
  margin-bottom: 2rem;
}

.wiki-ch-header {
  margin-bottom: 2rem;
}

.wiki-ch-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.25rem 0.75rem;
  background: rgba(41, 151, 255, 0.08);
  border: 1px solid rgba(41, 151, 255, 0.2);
  border-radius: 9999px;
  font-size: 0.72rem;
  font-family: var(--apple-font-mono);
  color: var(--apple-blue);
  font-weight: 600;
  letter-spacing: 0.04em;
  margin-bottom: 1rem;
}

.wiki-article h1 {
  font-size: 2.35rem;
  font-weight: 700;
  color: var(--apple-text-primary);
  letter-spacing: -0.025em;
  line-height: 1.22;
  margin-bottom: 0.95rem;
}

.wiki-article-meta {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  font-size: 0.8rem;
  color: var(--apple-text-tertiary);
  margin-bottom: 2.25rem;
}

.wiki-article h2 {
  font-size: 1.45rem;
  font-weight: 600;
  color: var(--apple-text-primary);
  margin: 3.25rem 0 1.15rem 0;
  letter-spacing: -0.015em;
  line-height: 1.35;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.wiki-article h3 {
  font-size: 1.12rem;
  font-weight: 600;
  color: #e5e7eb;
  margin: 2.25rem 0 0.85rem 0;
  letter-spacing: -0.01em;
}

.wiki-article p {
  color: var(--apple-text-secondary);
  font-size: 0.975rem;
  margin-bottom: 1.35rem;
  line-height: 1.78;
}

.wiki-article ul, .wiki-article ol {
  margin: 1rem 0 1.5rem 1.65rem;
  color: var(--apple-text-secondary);
  font-size: 0.96rem;
}

.wiki-article li {
  margin-bottom: 0.55rem;
  line-height: 1.72;
}

.wiki-article strong {
  color: var(--apple-text-primary);
  font-weight: 600;
}

.wiki-article code:not(pre code) {
  font-family: var(--apple-font-mono);
  font-size: 0.84em;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--apple-border);
  padding: 0.15em 0.45em;
  border-radius: 5px;
  color: #e2e8f0;
}

/* ==========================================================================
   Apple Admonition Callout Boxes
   ========================================================================== */
.callout {
  padding: 1.25rem 1.5rem;
  border-radius: 12px;
  margin: 2rem 0;
  border: 1px solid;
  position: relative;
  background: var(--apple-surface);
}

.callout-title {
  font-weight: 600;
  font-size: 0.88rem;
  margin-bottom: 0.45rem;
  display: flex;
  align-items: center;
  gap: 0.55rem;
}

.callout p {
  font-size: 0.91rem;
  margin-bottom: 0;
  color: #cbd5e1;
  line-height: 1.68;
}

.callout-note {
  border-color: rgba(41, 151, 255, 0.25);
  background: rgba(41, 151, 255, 0.05);
}
.callout-note .callout-title { color: var(--apple-blue); }

.callout-tip {
  border-color: rgba(52, 211, 153, 0.25);
  background: rgba(52, 211, 153, 0.05);
}
.callout-tip .callout-title { color: var(--apple-green); }

.callout-warning {
  border-color: rgba(245, 158, 11, 0.25);
  background: rgba(245, 158, 11, 0.05);
}
.callout-warning .callout-title { color: var(--apple-amber); }

.callout-important {
  border-color: rgba(167, 139, 250, 0.25);
  background: rgba(167, 139, 250, 0.05);
}
.callout-important .callout-title { color: var(--apple-purple); }

/* ==========================================================================
   Apple Cardified Code Blocks (macOS Header + Subtle Highlighting)
   ========================================================================== */
.code-block-wrapper {
  position: relative;
  background: var(--apple-code-bg);
  border: 1px solid var(--apple-border);
  border-radius: 14px;
  margin: 1.85rem 0;
  overflow: hidden;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.35);
  transition: border-color 0.25s var(--apple-ease);
}

.code-block-wrapper:hover {
  border-color: var(--apple-border-elevated);
}

.code-block-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.65rem 1rem;
  background: rgba(255, 255, 255, 0.025);
  border-bottom: 1px solid var(--apple-border);
}

.code-header-left {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* macOS Window Dots (Muted, Sophisticated) */
.macos-dots {
  display: flex;
  align-items: center;
  gap: 6px;
}

.macos-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  opacity: 0.65;
  transition: opacity 0.2s var(--apple-ease);
}

.code-block-wrapper:hover .macos-dot {
  opacity: 0.9;
}

.dot-red { background: #ff5f56; }
.dot-yellow { background: #ffbd2e; }
.dot-green { background: #27c93f; }

.code-lang-tag {
  font-family: var(--apple-font-mono);
  font-size: 0.72rem;
  color: var(--apple-text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
}

/* Subtle Copy Button (Hover Fade-in + Physics Feedback) */
.btn-copy-snippet {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.74rem;
  font-family: var(--apple-font-sans);
  color: var(--apple-text-tertiary);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--apple-border);
  padding: 0.25rem 0.65rem;
  border-radius: 6px;
  cursor: pointer;
  opacity: 0.6;
  transition: all 0.22s var(--apple-ease);
}

.code-block-wrapper:hover .btn-copy-snippet {
  opacity: 1;
}

.btn-copy-snippet:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--apple-text-primary);
  border-color: rgba(255, 255, 255, 0.15);
}

.btn-copy-snippet.copied {
  color: var(--apple-green);
  border-color: rgba(52, 211, 153, 0.35);
  background: rgba(52, 211, 153, 0.08);
}

pre.code-pre {
  margin: 0;
  padding: 1.35rem 1.45rem;
  overflow-x: auto;
  font-family: var(--apple-font-mono);
  font-size: 0.88rem;
  line-height: 1.72;
  color: #e2e8f0;
}

/* ==========================================================================
   Syntax Highlighting Palette (Xcode Dark / Solarized Fusion)
   Harmonious, Soft, Balanced & Zero Eye-Strain
   ========================================================================== */
.kw { color: #c792ea; font-weight: 500; }  /* Soft Lilac / Violet */
.tp { color: #7dd3fc; font-weight: 500; }  /* Gentle Sky / Cyan */
.fn { color: #82aaff; }                   /* Calm Periwinkle Blue */
.st { color: #c3e88d; }                   /* Soft Sage / Cream Green */
.num { color: #ffcb6b; }                  /* Warm Champagne Gold */
.cm { color: #6272a4; font-style: italic; } /* Muted Slate Gray */
.op { color: #89ddff; }                   /* Pale Ice Slate */

/* ==========================================================================
   Minimalist Apple Spec Tables
   ========================================================================== */
.wiki-table-wrap {
  overflow-x: auto;
  margin: 2rem 0;
  border-radius: 12px;
  border: 1px solid var(--apple-border);
  background: var(--apple-surface);
}

.wiki-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  text-align: left;
}

.wiki-table th {
  background: rgba(255, 255, 255, 0.02);
  padding: 0.85rem 1.25rem;
  color: var(--apple-text-primary);
  font-weight: 600;
  font-size: 0.82rem;
  letter-spacing: 0.02em;
  border-bottom: 1px solid var(--apple-border);
}

.wiki-table td {
  padding: 0.95rem 1.25rem;
  border-bottom: 1px solid var(--apple-border-subtle);
  color: var(--apple-text-secondary);
}

.wiki-table tr:last-child td {
  border-bottom: none;
}

.wiki-table tr:hover td {
  background: rgba(255, 255, 255, 0.02);
}

/* ==========================================================================
   Chapter Pager (Apple Fluid Transition Cards)
   ========================================================================== */
.chapter-pager {
  display: flex;
  justify-content: space-between;
  margin-top: 3.5rem;
  gap: 1.25rem;
}

.pager-btn {
  display: flex;
  flex-direction: column;
  padding: 1rem 1.35rem;
  border-radius: 12px;
  background: var(--apple-surface);
  border: 1px solid var(--apple-border);
  text-decoration: none;
  min-width: 230px;
  transition: all 0.25s var(--apple-ease);
}

.pager-btn:hover {
  background: var(--apple-surface-hover);
  border-color: var(--apple-border-elevated);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
}

.pager-btn.next {
  text-align: right;
  margin-left: auto;
}

.pager-label {
  font-size: 0.72rem;
  font-family: var(--apple-font-mono);
  color: var(--apple-text-tertiary);
  margin-bottom: 0.35rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.pager-title {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--apple-text-primary);
}

/* ==========================================================================
   Responsive Adaptations
   ========================================================================== */
@media (max-width: 1240px) {
  .wiki-toc-wrapper {
    display: none;
  }
  .wiki-main {
    padding: 3rem 2.5rem 6rem 2.5rem;
  }
}

@media (max-width: 860px) {
  .wiki-search-box {
    display: none;
  }
  .btn-mobile-sidebar {
    display: block;
  }
  .wiki-sidebar {
    position: fixed;
    left: -100%;
    top: var(--header-h);
    z-index: 999;
    background: var(--apple-canvas);
    width: 280px;
    transition: left 0.3s var(--apple-ease);
    box-shadow: 10px 0 30px rgba(0, 0, 0, 0.5);
  }
  .wiki-sidebar.open {
    left: 0;
  }
  .wiki-main {
    padding: 2rem 1.25rem 4rem 1.25rem;
  }
  .chapter-pager {
    flex-direction: column;
  }
  .pager-btn.next {
    text-align: left;
    margin-left: 0;
  }
}