/**
 * Buddypia AI & Tech - Main Stylesheet
 * Architectural Rigor meets Technical Editorial Authority
 * Spec: google-labs-code/design.md
 */

/* ==========================================================================
   Design Tokens (Dark Mode Default)
   ========================================================================== */
:root {
  --bg-primary: #0d0e12;
  --bg-secondary: #14161e;
  --bg-tertiary: #1b1e2b;
  --bg-card: #14161e;
  --bg-card-hover: #191c28;
  --bg-input: #1b1e2b;
  
  --border-hairline: #232634;
  --border-subtle: #2e3346;
  --border-focus: #e5a853;
  
  --text-primary: #f4f4f6;
  --text-secondary: #a1a1aa;
  --text-muted: #71717a;
  
  --accent: #e5a853;
  --accent-hover: #f59e0b;
  --accent-subtle: rgba(229, 168, 83, 0.1);
  
  --code-bg: #0a0b0e;
  --code-header: #121319;
  --code-border: #1e202b;
  --code-text: #e4e4e7;

  /* Terminal Window Tokens (Dark Mode - Matte Obsidian) */
  --term-bg: #090a0f;
  --term-header: #12141c;
  --term-border: #232738;
  --term-title: #f8fafc;
  --term-tagline: #e5a853;
  --term-text: #e2e8f0;
  --term-muted: #94a3b8;
  --term-dim: #7b889b;
  --term-ascii: #242938;
  --term-input-bg: #0e1017;
  --term-input-border: #272c3d;
  --term-input-text: #ffffff;
  --term-pill-bg: #141722;
  --term-pill-border: #262c3e;
  --term-pill-text: #cbd5e1;
  --term-ps1: #98c379;
  --term-error: #f87171;
  
  --container-max: 1180px;
  --container-article: 760px;
  --header-height: 64px;
  
  --font-sans: 'Plus Jakarta Sans', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans JP', sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

/* Light Theme Variables */
[data-theme="light"] {
  --bg-primary: #fafaf9;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f4f4f5;
  --bg-card: #ffffff;
  --bg-card-hover: #fafafa;
  --bg-input: #f4f4f5;
  
  --border-hairline: #e4e4e7;
  --border-subtle: #d4d4d8;
  --border-focus: #d97706;
  
  --text-primary: #09090b;
  --text-secondary: #52525b;
  --text-muted: #71717a;
  
  --accent: #d97706;
  --accent-hover: #b45309;
  --accent-subtle: rgba(217, 119, 6, 0.08);
  
  --code-bg: #14161f;
  --code-header: #1a1d29;
  --code-border: #272a38;
  --code-text: #f4f4f5;

  /* Terminal Window Tokens (Light Mode - Crisp High-Contrast) */
  --term-bg: #f8fafc;
  --term-header: #edf2f7;
  --term-border: #cbd5e1;
  --term-title: #0f172a;
  --term-tagline: #b45309;
  --term-text: #1e293b;
  --term-muted: #475569;
  --term-dim: #64748b;
  --term-ascii: #cbd5e1;
  --term-input-bg: #ffffff;
  --term-input-border: #94a3b8;
  --term-input-text: #0f172a;
  --term-pill-bg: #ffffff;
  --term-pill-border: #cbd5e1;
  --term-pill-text: #1e293b;
  --term-ps1: #15803d;
  --term-error: #dc2626;
}

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

html {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background-color: var(--bg-primary);
  background-image: radial-gradient(circle, rgba(255, 255, 255, 0.045) 1px, transparent 1px);
  background-size: 24px 24px;
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color 0.2s ease, color 0.2s ease;
}

[data-theme="light"] body {
  background-image: radial-gradient(circle, rgba(0, 0, 0, 0.035) 1px, transparent 1px);
}

a {
  color: var(--text-primary);
  text-decoration: none;
  transition: color 0.15s ease;
}

a:hover {
  color: var(--accent);
}

/* Layout Containers */
.bp-container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

.bp-container-article {
  width: 100%;
  max-width: var(--container-article);
  margin: 0 auto;
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.bp-header {
  position: sticky;
  top: 0;
  width: 100%;
  height: var(--header-height);
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-hairline);
  z-index: 500;
}

.bp-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.bp-brand {
  display: flex;
  align-items: center;
}

.bp-brand-logo svg {
  height: 36px;
  width: auto;
  display: block;
}

.bp-logo-text {
  fill: var(--text-primary);
  transition: fill 0.2s ease;
}

.bp-logo-sub {
  fill: var(--text-muted);
}

/* Navigation Links */
.bp-nav-desktop {
  display: flex;
  align-items: center;
  gap: 4px;
}

.bp-nav-link {
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  padding: 6px 12px;
  border-radius: 4px;
  transition: all 0.15s ease;
}

.bp-nav-link:hover,
.bp-nav-link.active {
  color: var(--text-primary);
  background: var(--bg-tertiary);
}

/* Header Right Actions */
.bp-header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* Official 𝕏 Button */
.bp-btn-x {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-hairline);
  color: var(--text-primary) !important;
  font-size: 0.8125rem;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: 4px;
  transition: all 0.15s ease;
}

.bp-btn-x svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
  flex-shrink: 0;
}

.bp-btn-x:hover {
  background: var(--bg-tertiary);
  border-color: var(--border-subtle);
  color: var(--accent) !important;
}

/* Theme Mode Toggle */
.bp-theme-toggle {
  background: var(--bg-secondary);
  border: 1px solid var(--border-hairline);
  color: var(--text-secondary);
  width: 34px;
  height: 34px;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.15s ease;
}

.bp-theme-toggle:hover {
  color: var(--text-primary);
  border-color: var(--border-subtle);
}

.bp-theme-toggle svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
}

/* Mobile Toggle */
.bp-menu-btn {
  display: none;
  background: transparent;
  border: none;
  color: var(--text-primary);
  width: 34px;
  height: 34px;
  cursor: pointer;
  align-items: center;
  justify-content: center;
}

.bp-menu-btn svg {
  width: 20px;
  height: 20px;
}

/* Mobile Drawer */
.bp-mobile-drawer {
  display: none;
  position: fixed;
  top: var(--header-height);
  left: 0;
  width: 100%;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-hairline);
  padding: 16px 24px;
  z-index: 490;
  flex-direction: column;
  gap: 12px;
}

.bp-mobile-drawer.open {
  display: flex;
}

/* ==========================================================================
   Homepage: Clean Technical Hero & Category Filter
   ========================================================================== */
.bp-hero {
  padding: 48px 0 40px;
  border-bottom: 1px solid var(--border-hairline);
}

.bp-hero-bottom-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
  margin-top: 28px;
}

.bp-hero-ctas {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.bp-btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--text-primary);
  color: var(--bg-primary) !important;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  padding: 9px 18px;
  border-radius: 4px;
  transition: opacity 0.15s ease;
  letter-spacing: 0.02em;
}

.bp-btn-primary:hover {
  opacity: 0.88;
}

/* Category Filter Bar (CLI Flags) */
.bp-category-filter {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.bp-filter-label {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 700;
  color: var(--text-muted);
  letter-spacing: 0.06em;
  margin-right: 4px;
}

.bp-filter-pill {
  padding: 5px 11px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  background: var(--bg-secondary);
  border: 1px solid var(--border-hairline);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.15s ease;
}

.bp-filter-pill:hover,
.bp-filter-pill.active {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border-color: var(--border-subtle);
}

.bp-filter-pill.active {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-subtle);
}

/* ==========================================================================
   Featured Article Card
   ========================================================================== */
.bp-featured-section {
  padding: 40px 0;
  border-bottom: 1px solid var(--border-hairline);
}

.bp-featured-card {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 36px;
  align-items: center;
  background: var(--bg-secondary);
  border: 1px solid var(--border-hairline);
  border-radius: 8px;
  overflow: hidden;
  padding: 24px;
  transition: border-color 0.2s ease;
}

.bp-featured-card:hover {
  border-color: var(--border-subtle);
}

.bp-featured-thumb {
  border-radius: 6px;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: var(--bg-tertiary);
}

.bp-featured-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.bp-featured-label {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 10px;
}

.bp-featured-title {
  font-size: 1.625rem;
  font-weight: 700;
  line-height: 1.35;
  margin-bottom: 12px;
}

.bp-featured-title a {
  color: var(--text-primary);
}

.bp-featured-title a:hover {
  color: var(--accent);
}

.bp-featured-excerpt {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  line-height: 1.65;
  margin-bottom: 18px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ==========================================================================
   Article Grid & Cards
   ========================================================================== */
.bp-posts-section {
  padding: 48px 0 64px;
}

.bp-section-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 24px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-hairline);
}

.bp-section-title {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.015em;
  color: var(--text-primary);
}

.bp-posts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
}

.bp-post-card {
  background: var(--bg-card);
  border: 1px solid var(--border-hairline);
  border-radius: 8px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: border-color 0.2s ease;
}

.bp-post-card:hover {
  border-color: var(--border-subtle);
}

.bp-card-thumb-wrap {
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--bg-tertiary);
  border-bottom: 1px solid var(--border-hairline);
}

.bp-card-thumb-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.bp-card-body {
  padding: 20px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.bp-card-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 10px;
}

.bp-card-meta .cat-label {
  color: var(--accent);
  font-weight: 600;
  text-transform: uppercase;
}

.bp-card-title {
  font-size: 1.125rem;
  font-weight: 700;
  line-height: 1.45;
  margin-bottom: 10px;
}

.bp-card-title a {
  color: var(--text-primary);
}

.bp-card-title a:hover {
  color: var(--accent);
}

.bp-card-excerpt {
  color: var(--text-secondary);
  font-size: 0.875rem;
  line-height: 1.6;
  margin-bottom: 16px;
  flex-grow: 1;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.bp-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 12px;
  border-top: 1px solid var(--border-hairline);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* ==========================================================================
   Single Post Layout & Typography
   ========================================================================== */
.bp-single-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 48px;
  padding: 48px 0 80px;
}

@media (max-width: 1024px) {
  .bp-single-layout {
    grid-template-columns: 1fr;
  }
  .bp-sidebar {
    display: none;
  }
}

.bp-article-header {
  margin-bottom: 36px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-hairline);
}

.bp-breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.bp-breadcrumbs a {
  color: var(--text-secondary);
}

.bp-breadcrumbs span.sep {
  opacity: 0.5;
}

.bp-article-title {
  font-size: clamp(1.85rem, 3.5vw, 2.5rem);
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 18px;
}

.bp-article-meta-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.bp-meta-items {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.bp-article-featured-img {
  margin: 28px 0 36px;
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--border-hairline);
}

.bp-article-featured-img img {
  width: 100%;
  height: auto;
  display: block;
}

/* ==========================================================================
   Table of Contents (目次) - Clean Editorial Index
   ========================================================================== */
.bp-toc-card,
div#ez-toc-container,
div#ez-toc-container.ez-toc-grey {
  background: var(--bg-secondary) !important;
  border: 1px solid var(--border-hairline) !important;
  border-radius: 8px !important;
  padding: 20px 24px !important;
  margin: 32px 0 !important;
  box-shadow: none !important;
  width: 100% !important;
}

.bp-toc-header,
div#ez-toc-container .ez-toc-title-container {
  display: flex !important;
  align-items: center !important;
  justify-content: space-between !important;
  margin-bottom: 14px !important;
  padding-bottom: 10px !important;
  border-bottom: 1px solid var(--border-hairline) !important;
}

.bp-toc-title,
div#ez-toc-container p.ez-toc-title {
  font-family: var(--font-mono) !important;
  font-size: 0.8125rem !important;
  font-weight: 700 !important;
  text-transform: uppercase !important;
  letter-spacing: 0.06em !important;
  color: var(--text-primary) !important;
  margin: 0 !important;
}

.bp-toc-toggle,
div#ez-toc-container .ez-toc-title-toggle a {
  background: var(--bg-tertiary) !important;
  border: 1px solid var(--border-hairline) !important;
  color: var(--text-secondary) !important;
  padding: 3px 10px !important;
  border-radius: 4px !important;
  font-family: var(--font-mono) !important;
  font-size: 0.6875rem !important;
  font-weight: 600 !important;
  text-decoration: none !important;
  transition: all 0.15s ease !important;
}

.bp-toc-toggle:hover,
div#ez-toc-container .ez-toc-title-toggle a:hover {
  color: var(--text-primary) !important;
  border-color: var(--border-subtle) !important;
}

/* TOC Links */
.bp-toc-list,
div#ez-toc-container ul.ez-toc-list {
  list-style: none !important;
  margin: 0 !important;
  padding: 0 !important;
}

.bp-toc-list li,
div#ez-toc-container ul.ez-toc-list li {
  margin-bottom: 6px !important;
  line-height: 1.5 !important;
}

.bp-toc-list li a,
div#ez-toc-container ul.ez-toc-list li a {
  color: var(--text-secondary) !important;
  font-size: 0.875rem !important;
  font-weight: 400 !important;
  text-decoration: none !important;
  transition: color 0.15s ease !important;
}

.bp-toc-list li a:hover,
div#ez-toc-container ul.ez-toc-list li a:hover {
  color: var(--accent) !important;
}

div#ez-toc-container.ez-toc-counter nav ul li a::before {
  color: var(--text-muted) !important;
  font-family: var(--font-mono) !important;
  font-size: 0.8em !important;
  margin-right: 0.5em !important;
}

div#ez-toc-container ul.ez-toc-list ul {
  padding-left: 18px !important;
  margin-top: 4px !important;
}

div#ez-toc-container ul.ez-toc-list ul li a {
  font-size: 0.8125rem !important;
  color: var(--text-muted) !important;
}

/* Sticky Sidebar TOC */
.bp-sticky-toc {
  position: sticky;
  top: calc(var(--header-height) + 24px);
  background: var(--bg-secondary);
  border: 1px solid var(--border-hairline);
  border-radius: 8px;
  padding: 20px;
  max-height: calc(100vh - var(--header-height) - 48px);
  overflow-y: auto;
}

.bp-sticky-toc-header {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: 14px;
}

.bp-sticky-toc-nav a {
  display: block;
  font-size: 0.8125rem;
  color: var(--text-muted);
  padding: 5px 10px;
  border-left: 2px solid transparent;
  transition: all 0.15s ease;
  line-height: 1.45;
}

.bp-sticky-toc-nav a:hover {
  color: var(--text-primary);
}

.bp-sticky-toc-nav a.active {
  color: var(--accent);
  border-left-color: var(--accent);
  font-weight: 600;
}

/* ==========================================================================
   Article Content & Typography
   ========================================================================== */
.bp-article-content {
  font-size: 1.0625rem;
  line-height: 1.75;
  color: var(--text-secondary);
}

.bp-article-content p {
  margin-bottom: 24px;
}

/* Solid Headings */
.bp-article-content h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.35;
  margin: 48px 0 18px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-hairline);
  scroll-margin-top: 80px;
}

.bp-article-content h3 {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.4;
  margin: 36px 0 14px;
  scroll-margin-top: 80px;
}

.bp-article-content h4 {
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 28px 0 12px;
}

/* Developer-Grade Code Blocks */
.bp-article-content pre {
  background: var(--code-bg);
  border: 1px solid var(--code-border);
  border-radius: 8px;
  margin: 28px 0;
  overflow: hidden;
  font-family: var(--font-mono);
}

.bp-code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 14px;
  background: var(--code-header);
  border-bottom: 1px solid var(--code-border);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: #94a3b8;
}

.bp-code-info {
  display: flex;
  align-items: center;
  gap: 8px;
}

.bp-code-lang {
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  font-size: 0.6875rem;
}

.bp-code-controls {
  display: flex;
  align-items: center;
  gap: 6px;
}

.bp-code-tool-btn,
.bp-code-copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: #cbd5e1;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  padding: 3px 8px;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.bp-code-tool-btn:hover,
.bp-code-copy-btn:hover {
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.35);
  background: rgba(255, 255, 255, 0.12);
}

.bp-code-tool-btn.active {
  background: var(--accent-subtle);
  color: var(--accent);
  border-color: var(--accent);
}

.bp-code-copy-btn svg {
  width: 12px;
  height: 12px;
  fill: currentColor;
}

.bp-article-content pre code {
  display: block;
  padding: 16px;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.65;
  color: var(--code-text);
  overflow-x: auto;
  background: transparent;
  border: none;
}

/* Code wrap mode */
.bp-article-content pre.is-wrapped code {
  white-space: pre-wrap !important;
  word-break: break-all !important;
}

/* Code line numbers mode */
.bp-article-content pre.has-line-numbers code {
  position: relative;
  padding-left: 54px;
}

.bp-article-content pre.has-line-numbers code::before {
  content: "01\A 02\A 03\A 04\A 05\A 06\A 07\A 08\A 09\A 10\A 11\A 12\A 13\A 14\A 15\A 16\A 17\A 18\A 19\A 20\A 21\A 22\A 23\A 24\A 25\A 26\A 27\A 28\A 29\A 30";
  position: absolute;
  top: 16px;
  left: 12px;
  width: 32px;
  text-align: right;
  color: var(--text-muted);
  opacity: 0.5;
  white-space: pre;
  font-size: 0.875rem;
  line-height: 1.65;
  pointer-events: none;
  border-right: 1px solid var(--code-border);
  padding-right: 8px;
}

/* Inline Code */
.bp-article-content :not(pre) > code {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-hairline);
  padding: 2px 5px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.875em;
}

/* Technical Callout / Executive Summary (Clean, 1px Border) */
.bp-tldr-card,
.bp-callout {
  background: var(--bg-secondary) !important;
  border: 1px solid var(--border-hairline) !important;
  border-left: 3px solid var(--accent) !important;
  border-radius: 6px !important;
  padding: 20px 24px !important;
  margin: 32px 0 !important;
}

.bp-callout-title {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 12px;
}

/* Technical Comparison Tables */
.bp-table-wrapper {
  overflow-x: auto;
  border: 1px solid var(--border-hairline);
  border-radius: 6px;
  margin: 32px 0;
  background: var(--bg-secondary);
}

.bp-article-content table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.875rem;
}

.bp-article-content th,
.bp-article-content td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-hairline);
}

.bp-article-content th {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.bp-article-content tr:last-child td {
  border-bottom: none;
}

.bp-article-content tr:hover td {
  background: var(--bg-tertiary);
}

/* Blockquotes */
.bp-article-content blockquote {
  border-left: 3px solid var(--border-subtle);
  padding: 12px 20px;
  margin: 28px 0;
  color: var(--text-secondary);
  font-style: normal;
}

/* Lists */
.bp-article-content ul,
.bp-article-content ol {
  padding-left: 24px;
  margin-bottom: 24px;
}

.bp-article-content li {
  margin-bottom: 6px;
}

/* Images & Figures */
.bp-article-content img {
  border-radius: 6px;
  border: 1px solid var(--border-hairline);
  margin: 28px auto;
}

/* ==========================================================================
   Social Share Bar & Author Box
   ========================================================================== */
.bp-share-bar {
  margin: 48px 0;
  padding: 18px 24px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-hairline);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.bp-share-title {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-muted);
}

.bp-share-buttons {
  display: flex;
  align-items: center;
  gap: 10px;
}

.bp-author-box {
  background: var(--bg-secondary);
  border: 1px solid var(--border-hairline);
  border-radius: 8px;
  padding: 24px;
  margin: 48px 0;
  display: flex;
  align-items: center;
  gap: 20px;
}

.bp-author-avatar {
  width: 60px;
  height: 60px;
  border-radius: 6px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-hairline);
  overflow: hidden;
  flex-shrink: 0;
}

.bp-author-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.bp-author-info {
  flex-grow: 1;
}

.bp-author-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 6px;
}

.bp-author-name {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--text-primary);
}

.bp-author-bio {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Previous / Next Article Navigation */
.bp-post-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 48px 0;
}

.bp-post-nav-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-hairline);
  border-radius: 6px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  transition: border-color 0.15s ease;
}

.bp-post-nav-card:hover {
  border-color: var(--border-subtle);
}

.bp-post-nav-dir {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.bp-post-nav-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.4;
}

/* Toast */
.bp-toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(80px);
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  padding: 10px 20px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
  z-index: 1000;
  transition: transform 0.2s ease;
}

.bp-toast.show {
  transform: translateX(-50%) translateY(0);
}

/* ==========================================================================
   Footer
   ========================================================================== */
.bp-footer {
  margin-top: auto;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-hairline);
  padding: 48px 0 24px;
}

.bp-footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.bp-footer-brand p {
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin: 12px 0 16px;
  max-width: 360px;
  line-height: 1.6;
}

.bp-footer-heading {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-primary);
  margin-bottom: 14px;
}

.bp-footer-links {
  list-style: none;
}

.bp-footer-links li {
  margin-bottom: 8px;
}

.bp-footer-links a {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.bp-footer-links a:hover {
  color: var(--text-primary);
}

.bp-footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 20px;
  border-top: 1px solid var(--border-hairline);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* ==========================================================================
   Geek Technical Aesthetics & Interactive Components (v2.0)
   ========================================================================== */

/* HUD Corner Crosshair Accent */
.bp-hud-box {
  position: relative;
}

.bp-hud-box::before,
.bp-hud-box::after {
  content: "+";
  position: absolute;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  line-height: 1;
  color: var(--border-subtle);
  pointer-events: none;
  transition: color 0.15s ease;
  z-index: 2;
  opacity: 0.65;
}

.bp-hud-box::before {
  top: 6px;
  left: 6px;
}

.bp-hud-box::after {
  bottom: 6px;
  right: 6px;
}

.bp-hud-box:hover::before,
.bp-hud-box:hover::after {
  color: var(--accent);
  opacity: 1;
}

/* Post Monospace Index */
.bp-geek-idx {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.05em;
  margin-right: 4px;
}

/* ==========================================================================
   Geek Tech Editorial Hero (Mobile-First AI Intelligence Platform)
   ========================================================================== */
.bp-hero-grid {
  display: grid;
  grid-template-columns: 1.65fr 1fr;
  gap: 36px;
  align-items: start;
}

/* Editorial Content Column */
.bp-hero-content {
  display: flex;
  flex-direction: column;
}

/* Live Telemetry Status Ticker */
.bp-hero-telemetry-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-hairline);
  padding: 4px 12px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 16px;
  align-self: flex-start;
  max-width: 100%;
  flex-wrap: wrap;
}

.bp-hero-telemetry-status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--term-ps1);
  font-weight: 700;
}

.bp-hero-pulse-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--term-ps1);
  box-shadow: 0 0 6px var(--term-ps1);
}

.bp-hero-badge-sep {
  color: var(--border-subtle);
  user-select: none;
}

.bp-hero-telemetry-ping {
  color: var(--accent);
  font-weight: 700;
}

/* Section Identity / Mission Chip */
.bp-hero-sys-label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--accent);
  margin-bottom: 12px;
}

.bp-sys-prefix {
  font-weight: 800;
  user-select: none;
}

/* Main Impactful Headline */
.bp-hero-h1 {
  font-family: var(--font-sans);
  font-size: clamp(1.85rem, 3.8vw, 2.75rem);
  font-weight: 800;
  line-height: 1.24;
  letter-spacing: -0.025em;
  color: var(--text-primary);
  margin-bottom: 14px;
}

.bp-break-mobile {
  display: none;
}

/* Concise Technical Subtitle */
.bp-hero-desc {
  font-size: 1rem;
  line-height: 1.68;
  color: var(--text-secondary);
  max-width: 580px;
  margin-bottom: 22px;
}

/* Sleek Geek Command / Search Bar */
.bp-geek-prompt-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: 6px;
  padding: 10px 16px;
  max-width: 580px;
  margin-bottom: 22px;
  cursor: pointer;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
  user-select: none;
}

.bp-geek-prompt-bar:hover {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent-subtle);
}

.bp-geek-ps1 {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--term-ps1);
  white-space: nowrap;
  flex-shrink: 0;
}

.bp-geek-prompt-input-wrap {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 4px;
  overflow: hidden;
}

.bp-geek-prompt-placeholder {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.bp-geek-cursor {
  color: var(--accent);
  animation: bp-blink 1s step-end infinite;
  font-weight: 700;
  font-size: 0.875rem;
}

.bp-geek-prompt-kbd {
  display: inline-flex;
  align-items: center;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-hairline);
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: 4px;
  flex-shrink: 0;
}

/* Category Filter Bar & Mini CTA */
.bp-hero-meta-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 14px;
}

.bp-btn-x-mini {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 4px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-hairline);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: all 0.15s ease;
}

.bp-btn-x-mini:hover {
  color: var(--accent);
  border-color: var(--accent);
}

/* Right Side: Developer Specs / Manifest Card */
.bp-hero-specs-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-hairline);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

.bp-specs-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  background: var(--code-header);
  border-bottom: 1px solid var(--border-hairline);
  font-family: var(--font-mono);
}

.bp-specs-title {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--accent);
}

.bp-specs-tag {
  font-size: 0.625rem;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 3px;
  background: var(--accent-subtle);
  color: var(--accent);
}

.bp-specs-body {
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.bp-spec-row {
  display: flex;
  flex-direction: column;
  gap: 3px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding-bottom: 10px;
  border-bottom: 1px dashed var(--border-hairline);
}

.bp-spec-row:last-child {
  padding-bottom: 0;
  border-bottom: none;
}

.bp-spec-key {
  font-weight: 700;
  color: var(--accent);
  font-size: 0.6875rem;
  letter-spacing: 0.04em;
}

.bp-spec-val {
  color: var(--text-secondary);
  line-height: 1.45;
}

.bp-spec-val code {
  background: var(--bg-tertiary);
  padding: 1px 5px;
  border-radius: 3px;
  color: var(--text-primary);
  font-size: 0.6875rem;
}

/* Technical Card Chips & Metadata */
.bp-card-thumb-wrap {
  position: relative;
}

.bp-card-chip {
  position: absolute;
  top: 8px;
  left: 8px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(10, 11, 14, 0.85);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  border: 1px solid var(--border-hairline);
  padding: 2px 8px;
  border-radius: 3px;
  font-family: var(--font-mono);
  font-size: 0.625rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  z-index: 2;
}

.bp-chip-id {
  color: var(--accent);
}

.bp-chip-cat {
  color: var(--text-primary);
}

.bp-card-exec-link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent) !important;
  transition: gap 0.15s ease;
}

.bp-card-exec-link:hover {
  gap: 8px;
}

.bp-section-title-wrap {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.bp-sec-prefix {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 700;
  color: var(--accent);
}

.bp-section-meta-telemetry {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--text-muted);
  display: flex;
  gap: 8px;
}

.bp-featured-meta-row {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

/* Single Post System Manifest Header */
.bp-post-sys-header {
  margin: 18px 0 20px;
  padding: 10px 14px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-hairline);
  border-radius: 4px;
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.bp-sys-tag {
  color: var(--term-ps1);
  font-weight: 700;
  letter-spacing: 0.05em;
  display: flex;
  align-items: center;
  gap: 6px;
}

.bp-sys-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--term-ps1);
  box-shadow: 0 0 5px var(--term-ps1);
}

.bp-sys-grid {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  color: var(--text-muted);
}

.bp-sys-k {
  color: var(--text-secondary);
  font-weight: 600;
}

/* Developer Shortcuts Bar */
.bp-shortcuts-hint {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  padding: 14px 18px;
  margin: 36px 0 16px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-hairline);
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--text-muted);
}

.bp-hint-title {
  color: var(--accent);
  font-weight: 700;
}

.bp-shortcuts-hint kbd {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-hairline);
  padding: 1px 5px;
  border-radius: 3px;
  color: var(--text-primary);
}

/* Header Command Palette Trigger */
.bp-cmd-trigger {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-hairline);
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  padding: 6px 12px;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.bp-cmd-trigger:hover {
  background: var(--bg-tertiary);
  border-color: var(--border-subtle);
  color: var(--text-primary);
}

.bp-cmd-kbd {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  background: var(--bg-primary);
  border: 1px solid var(--border-hairline);
  color: var(--text-muted);
  padding: 1px 5px;
  border-radius: 3px;
  line-height: 1.2;
}

.bp-cmd-trigger:hover .bp-cmd-kbd {
  color: var(--accent);
  border-color: var(--border-focus);
}

/* Reading Progress Bar (Single Posts) */
.bp-reading-progress {
  position: sticky;
  top: var(--header-height);
  left: 0;
  height: 2px;
  background: var(--accent);
  z-index: 501;
  pointer-events: none;
  transition: width 0.08s ease-out;
}

/* Command Palette Modal */
.bp-cmd-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(10, 11, 14, 0.78);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 2000;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 80px 20px 20px;
  opacity: 0;
  transition: opacity 0.15s ease;
}

.bp-cmd-backdrop.open {
  opacity: 1;
}

.bp-cmd-modal {
  width: 100%;
  max-width: 600px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  box-shadow: 0 20px 48px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(255, 255, 255, 0.05);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transform: translateY(-8px) scale(0.99);
  transition: transform 0.15s ease;
}

.bp-cmd-backdrop.open .bp-cmd-modal {
  transform: translateY(0) scale(1);
}

.bp-cmd-search-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border-hairline);
  background: var(--bg-card);
}

.bp-cmd-search-icon {
  color: var(--text-muted);
  flex-shrink: 0;
}

.bp-cmd-search-bar input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  color: var(--text-primary);
}

.bp-cmd-search-bar input::placeholder {
  color: var(--text-muted);
}

.bp-cmd-esc {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  color: var(--text-muted);
  padding: 2px 6px;
  border-radius: 4px;
  cursor: pointer;
}

.bp-cmd-results {
  max-height: 360px;
  overflow-y: auto;
  padding: 8px;
}

.bp-cmd-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.1s ease;
}

.bp-cmd-item:hover,
.bp-cmd-item.selected {
  background: var(--bg-tertiary);
}

.bp-cmd-item-left {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.bp-cmd-badge {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 4px;
  letter-spacing: 0.05em;
  flex-shrink: 0;
}
.bp-cmd-badge.nav { background: rgba(56, 189, 248, 0.12); color: #38bdf8; }
.bp-cmd-badge.post { background: rgba(229, 168, 83, 0.15); color: var(--accent); }
.bp-cmd-badge.action { background: rgba(168, 85, 247, 0.15); color: #c084fc; }

.bp-cmd-item-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.bp-cmd-item-sub {
  font-size: 0.75rem;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.bp-cmd-item-enter {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--text-muted);
  opacity: 0;
  transition: opacity 0.1s ease;
}

.bp-cmd-item:hover .bp-cmd-item-enter,
.bp-cmd-item.selected .bp-cmd-item-enter {
  opacity: 1;
  color: var(--accent);
}

.bp-cmd-empty {
  padding: 32px 16px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.bp-cmd-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 18px;
  background: var(--bg-card);
  border-top: 1px solid var(--border-hairline);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--text-muted);
}

.bp-cmd-hints {
  display: flex;
  gap: 12px;
}

.bp-cmd-hints kbd {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-hairline);
  padding: 1px 4px;
  border-radius: 3px;
}

.bp-cmd-telemetry {
  letter-spacing: 0.06em;
  color: var(--accent);
  font-weight: 600;
}

/* Mobile Floating TOC Button */
.bp-mobile-toc-btn {
  display: none;
  position: fixed;
  bottom: 24px;
  right: 20px;
  z-index: 600;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  padding: 10px 16px;
  border-radius: 20px;
  cursor: pointer;
  align-items: center;
  gap: 8px;
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.2s ease, transform 0.2s ease, border-color 0.15s ease;
}

.bp-mobile-toc-btn.visible {
  opacity: 1;
  transform: translateY(0);
}

.bp-mobile-toc-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* Mobile TOC Bottom Sheet */
.bp-mobile-toc-sheet {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 2500;
}

.bp-mobile-toc-backdrop {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(2px);
  opacity: 0;
  transition: opacity 0.2s ease;
}

.bp-mobile-toc-panel {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  max-height: 78vh;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-subtle);
  border-radius: 16px 16px 0 0;
  box-shadow: 0 -8px 32px rgba(0, 0, 0, 0.5);
  display: flex;
  flex-direction: column;
  transform: translateY(100%);
  transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  padding-bottom: 24px;
}

.bp-mobile-toc-sheet.open .bp-mobile-toc-backdrop {
  opacity: 1;
}

.bp-mobile-toc-sheet.open .bp-mobile-toc-panel {
  transform: translateY(0);
}

.bp-mobile-toc-handle {
  width: 36px;
  height: 4px;
  background: var(--border-subtle);
  border-radius: 2px;
  margin: 10px auto 4px;
}

.bp-mobile-toc-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px 10px;
  border-bottom: 1px solid var(--border-hairline);
}

.bp-mobile-toc-title {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.06em;
}

.bp-mobile-toc-close {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
}

.bp-mobile-toc-content {
  overflow-y: auto;
  padding: 12px 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.bp-mobile-toc-content a {
  font-size: 0.875rem;
  color: var(--text-secondary);
  padding: 8px 12px;
  border-radius: 4px;
  border-left: 2px solid transparent;
  transition: all 0.15s ease;
}

.bp-mobile-toc-content a.active {
  color: var(--accent);
  background: var(--accent-subtle);
  border-left-color: var(--accent);
  font-weight: 600;
}

/* Footer Telemetry Bar */
.bp-footer-telemetry {
  padding: 16px 0;
  border-top: 1px solid var(--border-hairline);
  margin-bottom: 24px;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--text-muted);
}

.bp-telemetry-inner {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}

.bp-telemetry-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

.bp-telemetry-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--term-ps1);
  box-shadow: 0 0 6px var(--term-ps1);
}

.bp-telemetry-sep {
  color: var(--border-subtle);
}

#bp-telemetry-ping {
  color: var(--accent);
  font-weight: 600;
}

/* ==========================================================================
   Responsive Refinements (Mobile & Tablet)
   ========================================================================== */
@media (max-width: 768px) {
  .bp-container {
    padding: 0 16px;
  }

  .bp-nav-desktop {
    display: none;
  }
  .bp-header-btn-x {
    display: none;
  }
  .bp-menu-btn {
    display: flex;
  }
  .bp-mobile-toc-btn {
    display: flex;
  }
  .bp-posts-grid {
    grid-template-columns: 1fr;
  }
  .bp-featured-card {
    grid-template-columns: 1fr;
  }
  .bp-footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }
  .bp-post-nav {
    grid-template-columns: 1fr;
  }
  .bp-author-box {
    flex-direction: column;
    text-align: left;
  }

  /* Geek Tech Hero Mobile Layout */
  .bp-hero {
    padding: 28px 0 32px;
  }

  .bp-hero-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .bp-break-mobile {
    display: inline;
  }

  .bp-hero-telemetry-badge {
    font-size: 0.625rem;
    padding: 3px 10px;
    gap: 6px;
    margin-bottom: 12px;
  }

  .bp-hero-sys-label {
    font-size: 0.6875rem;
    margin-bottom: 10px;
  }

  .bp-hero-h1 {
    font-size: clamp(1.5rem, 6.5vw, 2rem);
    line-height: 1.25;
    margin-bottom: 12px;
  }

  .bp-hero-desc {
    font-size: 0.875rem;
    line-height: 1.6;
    margin-bottom: 18px;
  }

  .bp-geek-prompt-bar {
    padding: 9px 12px;
    margin-bottom: 18px;
    width: 100%;
    gap: 8px;
  }

  .bp-geek-ps1 {
    font-size: 0.75rem;
  }

  .bp-geek-prompt-placeholder {
    font-size: 0.75rem;
  }

  .bp-hero-meta-nav {
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
  }

  .bp-category-filter {
    width: 100%;
    overflow-x: auto;
    flex-wrap: nowrap;
    padding-bottom: 6px;
    gap: 6px;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }

  .bp-category-filter::-webkit-scrollbar {
    display: none;
  }

  .bp-filter-pill {
    flex-shrink: 0;
    white-space: nowrap;
    min-height: 38px;
    padding: 6px 13px;
    font-size: 0.75rem;
    display: inline-flex;
    align-items: center;
    touch-action: manipulation;
  }

  .bp-hero-quick-links {
    display: flex;
    width: 100%;
  }

  .bp-btn-x-mini {
    width: 100%;
    justify-content: center;
    min-height: 38px;
  }

  .bp-hero-specs-card {
    margin-top: 4px;
  }

  .bp-specs-body {
    padding: 12px 14px;
    gap: 10px;
  }

  .bp-spec-row {
    padding-bottom: 8px;
  }
}

/* Extra small screen adjustments (<= 380px) */
@media (max-width: 380px) {
  .bp-container {
    padding: 0 12px;
  }

  .bp-hero-h1 {
    font-size: 1.45rem;
  }

  .bp-hero-telemetry-host {
    display: none;
  }
}