/* ==========================================================================
   ZENCOD.RU — Modern Developer Tech Blog & Knowledge Base
   Theme: Blueprint Precision & Modern Minimal
   WCAG 2.2 AA Compliant • Mobile Responsive (320px+) • SEO Ready
   ========================================================================== */

/* --- Root & Theme Variables --- */
:root {
  /* Common / Sizing / Fonts */
  --font-sans: 'Montserrat', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-heading: 'Quicksand', 'Nunito', var(--font-sans);
  --font-mono: 'Fira Code', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  --container-max: 1400px;
  --content-card-max: 1050px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;

  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.4s cubic-bezier(0.16, 1, 0.3, 1);

  --header-height: 64px;
  --touch-target-min: 44px;

  /* LIGHT THEME (WCAG 2.2 AA Contrast Verified) */
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-subtle: #f1f5f9;
  --bg-surface: #ffffff;
  --bg-surface-elevated: rgba(255, 255, 255, 0.95);
  --bg-card-hover: #f8fafc;

  /* High-contrast text colors (>4.5:1 against light backgrounds) */
  --text-primary: #090e17;
  --text-secondary: #27364b;
  --text-muted: #4b5563;
  --text-dim: #6b7280;

  --border-primary: #d1d5db;
  --border-secondary: #9ca3af;
  --border-subtle: #e5e7eb;
  --border-hover: #4b5563;

  --accent-cyan: #0369a1;
  --accent-cyan-subtle: rgba(3, 105, 161, 0.08);
  --accent-cyan-border: rgba(3, 105, 161, 0.3);
  --accent-blue: #1d4ed8;
  --accent-emerald: #4d8e0b;
  --accent-emerald-subtle: rgba(77, 142, 11, 0.05);
  --accent-emerald-border: rgba(77, 142, 11, 0.35);
  --accent-amber: #b45309;
  --accent-rose: #be123c;
  --accent-violet: #6d28d9;

  /* Blueprint Grid & Dimension Elements */
  --grid-line-major: rgba(3, 105, 161, 0.12);
  --grid-line-minor: rgba(3, 105, 161, 0.05);
  --blueprint-line: var(--accent-emerald);
  --blueprint-text: var(--accent-emerald);
  --blueprint-guide: var(--accent-emerald);
  --blueprint-dim: var(--accent-emerald);
  --blueprint-corner: var(--accent-emerald);

  /* UI Elements */
  --card-shadow: 0 2px 10px -1px rgba(15, 23, 42, 0.06), 0 0 0 1px var(--border-primary);
  --card-shadow-hover: 0 10px 25px -3px rgba(3, 105, 161, 0.12), 0 0 0 1px var(--accent-emerald-border);
  --modal-backdrop: rgba(15, 23, 42, 0.6);

  /* Code & kbd */
  --code-inline-bg: #f1f5f9;
  --code-inline-text: #4d8e0b;
  --code-inline-border: #cbd5e1;
  --kbd-bg: #ffffff;
  --kbd-border: #94a3b8;
  --kbd-text: #0f172a;
  --kbd-shadow: 0 1.5px 0 #64748b;

  /* Focus indicator */
  --focus-ring-color: #0284c7;
}

/* DARK THEME (WCAG 2.2 AA Contrast Verified) */
[data-theme="dark"] {
  --bg-primary: #0a0f1d;
  --bg-secondary: #0f172a;
  --bg-subtle: #141f36;
  --bg-surface: #111c33;
  --bg-surface-elevated: rgba(17, 28, 51, 0.95);
  --bg-card-hover: #162442;

  /* High-contrast text colors (>7:1 against dark backgrounds) */
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --text-dim: #64748b;

  --border-primary: rgba(148, 163, 184, 0.22);
  --border-secondary: rgba(148, 163, 184, 0.35);
  --border-subtle: rgba(148, 163, 184, 0.12);
  --border-hover: rgba(56, 189, 248, 0.5);

  --accent-cyan: #38bdf8;
  --accent-cyan-subtle: rgba(56, 189, 248, 0.12);
  --accent-cyan-border: rgba(56, 189, 248, 0.35);
  --accent-blue: #60a5fa;
  --accent-emerald: #98ed42;
  --accent-emerald-subtle: rgba(152, 237, 66, 0.12);
  --accent-emerald-border: rgba(152, 237, 66, 0.35);
  --accent-amber: #fbbf24;
  --accent-rose: #fb7185;
  --accent-violet: #a78bfa;

  /* Blueprint Grid & Dimension Elements */
  --grid-line-major: rgba(56, 189, 248, 0.1);
  --grid-line-minor: rgba(56, 189, 248, 0.035);
  --blueprint-line: var(--accent-emerald);
  --blueprint-text: var(--accent-emerald);
  --blueprint-guide: var(--accent-emerald);
  --blueprint-dim: var(--accent-emerald);
  --blueprint-corner: var(--accent-emerald);

  /* UI Elements */
  --card-shadow: 0 4px 20px -2px rgba(0, 0, 0, 0.4), 0 0 0 1px var(--border-primary);
  --card-shadow-hover: 0 12px 32px -4px rgba(0, 0, 0, 0.6), 0 0 0 1px var(--accent-emerald-border), 0 0 20px rgba(56, 189, 248, 0.08);
  --modal-backdrop: rgba(3, 7, 18, 0.82);

  /* Code & kbd */
  --code-inline-bg: #1e293b;
  --code-inline-text: #98ed42;
  --code-inline-border: rgba(56, 189, 248, 0.25);
  --kbd-bg: #1e293b;
  --kbd-border: rgba(255, 255, 255, 0.25);
  --kbd-text: #f1f5f9;
  --kbd-shadow: 0 1.5px 0 rgba(0, 0, 0, 0.8);

  /* Focus indicator */
  --focus-ring-color: #38bdf8;
}

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

html {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  overflow-x: clip;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: clip;
  position: relative;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

body.menu-open {
  overflow: hidden;
}

/* Accessibility: Visible Focus Indicators (WCAG 2.4.7 / 2.4.11) */
:focus {
  outline: none;
}

:focus-visible {
  outline: 2px solid var(--focus-ring-color);
  outline-offset: 3px;
  }

/* Accessibility: Skip Link (WCAG 2.4.1) */
.skip-link {
  position: absolute;
  top: -120px;
  left: 1rem;
  background-color: var(--accent-emerald);
  color: #ffffff !important;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.9375rem;
  padding: 0.625rem 1.25rem;
  z-index: 99999;
  text-decoration: none;
  transition: top var(--transition-fast);
}

.skip-link:focus-visible {
  top: 1rem;
  outline: 3px solid #ffffff;
  outline-offset: 2px;
}

/* Accessibility: Visually Hidden utility */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Accessibility: Reduced Motion (WCAG 2.3) */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* Blueprint Grid Layer */
.blueprint-bg {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    linear-gradient(to right, var(--grid-line-major) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-line-major) 1px, transparent 1px),
    linear-gradient(to right, var(--grid-line-minor) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-line-minor) 1px, transparent 1px);
  background-size: 80px 80px, 80px 80px, 16px 16px, 16px 16px;
  background-position: center top;
}

/* Blueprint Technical Annotations (X/Y coordinates) */
.blueprint-marker {
  position: absolute;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  color: var(--blueprint-dim);
  user-select: none;
  pointer-events: none;
  letter-spacing: 0.05em;
  display: flex;
  align-items: center;
  gap: 4px;
  z-index: 1;
  opacity: .5;
}

.blueprint-marker::before {
  content: '';
  display: inline-block;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background-color: var(--blueprint-line);
}

/* Hide fixed edge markers on tablets & smartphones to prevent clutter & overflow */
@media (max-width: 1024px) {
  .blueprint-marker {
    display: none;
  }
}

/* Dimension Guide Arrows wrapper (as seen in reference) */
.dimension-guide-horizontal {
  position: relative;
  width: 100%;
  display: flex;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--blueprint-text);
  margin: 0.625rem 0;
  user-select: none;
  pointer-events: none;
  overflow: hidden;
}

.dimension-guide-horizontal::before {
  content: '<';
  padding-left: 2px;
  margin-right: -2px;
  color: var(--blueprint-line);
  flex-shrink: 0;
  font-size: 1rem;
  line-height: 1;
  margin-top: -4px;
  border-left: 1px solid;
}

.dimension-guide-horizontal::after {
  content: '>';
  padding-right: 2px;
  margin-left: -2px;
  color: var(--blueprint-line);
  flex-shrink: 0;
  font-size: 1rem;
  line-height: 1;
  margin-top: -4px;
  border-right: 1px solid;
}

.dimension-guide-horizontal .line {
  flex: 1;
  height: 1px;
  background-color: var(--blueprint-guide);
  min-width: 12px;
  margin-top: -3px;
  margin-left: -6px;
  margin-right: -6px;
}

.dimension-guide-horizontal .text {
  padding: 0 8px;
  font-weight: 500;
  letter-spacing: 0.04em;
  white-space: nowrap;
  font-size: clamp(0.5625rem, 2vw, 0.6875rem);
}

/* Technical Corner Markings for Cards */
.blueprint-corners {
  position: relative;
}

.blueprint-corners::before,
.blueprint-corners::after {
  content: '';
  position: absolute;
  width: 7px;
  height: 7px;
  border-color: var(--blueprint-corner);
  color: var(--blueprint-corner);
  pointer-events: none;
  opacity: 0.75;
  transition: opacity var(--transition-fast);
}

.blueprint-corners::before {
  top: -1px;
  left: -1px;
  border-top: 1.5px solid;
  border-left: 1.5px solid;
}

.blueprint-corners::after {
  bottom: -1px;
  right: -1px;
  border-bottom: 1.5px solid;
  border-right: 1.5px solid;
}

/* --- Container & Layout --- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.25rem;
  position: relative;
  z-index: 2;
}

@media (max-width: 640px) {
  .container {
    padding: 0 1rem;
  }
}

.content-card-container {
  width: 100%;
  max-width: var(--content-card-max);
  margin: 4px auto;
}

/* --- Header / Navigation Bar --- */
.site-header {
  position: sticky;
  top: 0;
  height: var(--header-height);
  background-color: var(--bg-surface-elevated);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-primary);
  z-index: 100;
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: 1rem;
}

/* Logo */
.site-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--text-primary);
  font-family: var(--font-heading);
  font-size: 1.375rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  position: relative;
  min-height: var(--touch-target-min);
  padding: 4px 0;
}

.logo-brand {
  display: flex;
  align-items: center;
  letter-spacing: 0.06em;
}

.logo-brand .logo-glyph {
  position: relative;
  color: var(--text-primary);
  margin-top: -2px;
}

.logo-brand .logo-accent {
  color: var(--accent-emerald);
  display: inline-block;
  position: relative;
}

.logo-brand .logo-badge {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  font-weight: 600;
  padding: 1px 5px;
  background-color: var(--accent-emerald-subtle);
  border: 1px solid var(--accent-emerald-border);
  color: var(--accent-emerald);
  margin-left: 6px;
  vertical-align: middle;
}

/* Navigation Links */
.nav-menu {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 0.375rem;
}

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 0.5rem 0.875rem;
  min-height: var(--touch-target-min);
  color: var(--text-secondary);
  font-size: 0.9375rem;
  font-weight: 500;
  text-decoration: none;
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.nav-link:hover {
  color: var(--text-primary);
  background-color: var(--bg-subtle);
}

.nav-link.active,
.nav-link[aria-current="page"] {
  color: var(--accent-emerald);
  font-weight: 600;
}

.nav-link.active::after,
.nav-link[aria-current="page"]::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 2px;
  background-color: var(--accent-emerald);
  }

/* Header Actions */
.header-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Accessible Interactive Icon Buttons (WCAG 2.5.8 Target Size ≥ 44x44px) */
.btn-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: var(--touch-target-min);
  min-height: var(--touch-target-min);
  width: 44px;
  height: 44px;
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
  text-decoration: none;
}

.btn-icon:hover {
  color: var(--accent-emerald);
  border-color: var(--accent-emerald-border);
  background-color: var(--accent-emerald-subtle);
}

.btn-icon svg {
  pointer-events: none;
  flex-shrink: 0;
}

.btn-search-trigger {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 0.375rem 0.75rem;
  min-height: var(--touch-target-min);
  font-size: 0.875rem;
  color: var(--text-muted);
  background-color: var(--bg-surface);
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-search-trigger:hover {
  border-color: var(--accent-emerald-border);
  color: var(--text-secondary);
  background-color: var(--bg-subtle);
}

.btn-search-trigger .search-kbd {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-secondary);
  padding: 2px 6px;
  color: var(--text-muted);
}

/* Mobile Nav Toggle */
.mobile-nav-toggle {
  display: none;
}

/* --- Hero Section --- */
.hero-section {
  position: relative;
  padding: clamp(1.5rem, 4vw, 3.5rem) 0 2rem;
  overflow: hidden;
}

/* Blueprint Schematic Art in Hero / Article */
.blueprint-schematic-wrapper {
  position: relative;
  width: 100%;
  max-width: var(--content-card-max);
  margin: 0 auto 1.5rem;
  border: 1px solid var(--border-primary);
  background-color: var(--bg-surface);
  overflow: hidden;
}

.blueprint-schematic-canvas {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  height: auto;
  max-height: 20vw;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background-image:
    linear-gradient(to right, var(--grid-line-major) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-line-major) 1px, transparent 1px),
    linear-gradient(to right, var(--grid-line-minor) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-line-minor) 1px, transparent 1px);
  background-size: 40px 40px, 40px 40px, 10px 10px, 10px 10px;
  background-position: center;
}

/* Hide hero schematic preview on smartphones */
@media (max-width: 768px) {
  .blueprint-schematic-wrapper,
  .blueprint-schematic-canvas {
    display: none !important;
  }
}

.schematic-lqip {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: blur(12px);
  transform: scale(1.08);
  pointer-events: none;
  z-index: 1;
  transition: opacity 0.4s ease-out;
}

.blueprint-schematic-canvas.is-loaded .schematic-lqip,
.blueprint-schematic-canvas:has(.schematic-svg.loaded) .schematic-lqip {
  opacity: 0;
}

.schematic-svg {
  position: relative;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0;
  transition: opacity 0.35s ease-in-out;
  z-index: 2;
}

.schematic-svg.loaded {
  opacity: 1;
}

@media (scripting: none) {
  .schematic-svg {
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .schematic-svg {
    transition: none;
  }
}

/* Reference Exact Featured Card (from example.jpg) */
.featured-card {
  position: relative;
  width: 100%;
  max-width: var(--content-card-max);
  margin: 0 auto;
  background-color: var(--bg-surface-elevated);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border-primary);
  padding: clamp(1.25rem, 3.5vw, 2.25rem);
  transition: all var(--transition-normal);
  z-index: 2;
}

.featured-card:hover {
  border-color: var(--accent-emerald-border);
}

.card-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.card-meta-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.hero-title {
  font-family: var(--font-heading);
  font-size: clamp(1.75rem, 3.5vw, 2.75rem);
  text-align: left;
  margin-bottom: 0.75rem;
}

.card-title {
  font-family: var(--font-heading);
  font-size: clamp(1.35rem, 2.75vw, 2.125rem);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 1.25rem;
  text-decoration: none;
  display: block;
}

.card-title a {
  color: inherit;
  text-decoration: none;
}

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

.card-excerpt {
  font-size: clamp(0.9375rem, 1.5vw, 1rem);
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 1.5rem;
  word-break: break-word;
}

/* Keyboard styling matching reference */
kbd, .kbd-key {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: clamp(0.75rem, 1.5vw, 0.8125rem);
  font-weight: 500;
  line-height: 1.2;
  padding: 0.25rem 0.5rem;
  color: var(--kbd-text);
  background-color: var(--kbd-bg);
  border: 1px solid var(--kbd-border);
  vertical-align: baseline;
  white-space: nowrap;
  margin: 0 1px;
}

/* Highlighted keywords as seen in reference body text */
.highlight-term {
  color: var(--accent-amber);
  font-weight: 500;
}

/* --- Section Layouts --- */
.section {
  padding: clamp(2rem, 4vw, 3.5rem) 0;
  position: relative;
  z-index: 2;
}

.section-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: 1.75rem;
  border-bottom: 1px solid var(--border-primary);
  padding-bottom: 0.875rem;
  gap: 1rem;
  flex-wrap: wrap;
}

.section-title-wrap {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.section-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent-emerald);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.section-title {
  font-family: var(--font-heading);
  font-size: clamp(1.35rem, 2.5vw, 1.75rem);
  font-weight: 750;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.section-link {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--accent-emerald);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-weight: 500;
  min-height: var(--touch-target-min);
  padding: 4px 0;
  transition: gap var(--transition-fast);
}

.section-link:hover {
  gap: 8px;
  text-decoration: underline;
}

/* Filter Tags / Tabs (Horizontally scrollable on small screens) */
.filter-tabs {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.75rem;
}

@media (max-width: 640px) {
  .filter-tabs {
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 6px;
    margin-right: -1rem;
    padding-right: 1rem;
  }
}

.filter-btn {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 500;
  padding: 0.4rem 0.875rem;
  min-height: 38px;
  border: 1px solid var(--border-primary);
  background-color: var(--bg-surface);
  color: var(--text-secondary);
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  flex-shrink: 0;
}

.filter-btn:hover {
  color: var(--text-primary);
  border-color: var(--accent-emerald-border);
  background-color: var(--bg-subtle);
}

.filter-btn.active,
.filter-btn[aria-pressed="true"] {
  color: var(--accent-emerald);
  background-color: var(--accent-emerald-subtle);
  border-color: var(--accent-emerald);
  font-weight: 600;
}

/* Articles Grid (Responsive 1-col on mobile, 2-col on tablet, 3-col on desktop) */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 320px), 1fr));
  gap: 1.5rem;
}

@media (max-width: 480px) {
  .articles-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
}

.article-card {
  position: relative;
  display: flex;
  flex-direction: column;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-primary);
  padding: 1.35rem;
  transition: all var(--transition-normal);
  text-decoration: none;
  color: inherit;
  overflow: hidden;
}

.article-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent-emerald-border);
}

.article-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.875rem;
  gap: 0.5rem;
}

.category-tag {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  padding: 3px 8px;
  background-color: var(--bg-subtle);
  color: var(--text-secondary);
  border: 1px solid var(--border-primary);
  display: inline-flex;
  align-items: center;
  text-decoration: none;
}

.category-tag.linux {
  color: #0284c7;
  border-color: rgba(2, 132, 199, 0.35);
  background-color: rgba(2, 132, 199, 0.08);
}
[data-theme="dark"] .category-tag.linux {
  color: #38bdf8;
  border-color: rgba(56, 189, 248, 0.35);
  background-color: rgba(56, 189, 248, 0.12);
}

.category-tag.javascript {
  color: #b45309;
  border-color: rgba(180, 83, 9, 0.35);
  background-color: rgba(180, 83, 9, 0.08);
}
[data-theme="dark"] .category-tag.javascript {
  color: #facc15;
  border-color: rgba(250, 204, 21, 0.35);
  background-color: rgba(250, 204, 21, 0.12);
}

.category-tag.web {
  color: #6d28d9;
  border-color: rgba(109, 40, 217, 0.35);
  background-color: rgba(109, 40, 217, 0.08);
}
[data-theme="dark"] .category-tag.web {
  color: #a78bfa;
  border-color: rgba(167, 139, 250, 0.35);
  background-color: rgba(167, 139, 250, 0.12);
}

.category-tag.tools {
  color: #047857;
  border-color: rgba(4, 120, 87, 0.35);
  background-color: rgba(4, 120, 87, 0.08);
}
[data-theme="dark"] .category-tag.tools {
  color: #34d399;
  border-color: rgba(52, 211, 153, 0.35);
  background-color: rgba(52, 211, 153, 0.12);
}

.article-card-date {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Card Preview Image & LQIP */
.article-card-cover {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-sm);
  overflow: hidden;
  margin-bottom: 0.875rem;
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-primary);
  text-decoration: none;
}

.article-card:hover .article-card-cover {
  border-color: var(--accent-emerald-border);
}

.article-card-lqip {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: blur(10px);
  transform: scale(1.08);
  pointer-events: none;
  z-index: 1;
  transition: opacity 0.4s ease-out;
}

.article-card-cover.is-loaded .article-card-lqip,
.article-card-cover:has(.article-card-img.loaded) .article-card-lqip {
  opacity: 0;
}

.article-card-img {
  position: relative;
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0;
  transition: opacity 0.35s ease-in-out, transform var(--transition-normal);
  z-index: 2;
}

.article-card-img.loaded {
  opacity: 1;
}

.article-card:hover .article-card-img {
  transform: scale(1.03);
}

@media (scripting: none) {
  .article-card-img {
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .article-card-img {
    transition: none;
  }
  .article-card:hover .article-card-img {
    transform: none;
  }
}

.article-card-title {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.35;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
  transition: color var(--transition-fast);
}

.article-card-title a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

.article-card-title a:focus-visible {
  outline: 2px solid var(--focus-ring-color);
  outline-offset: 2px;
  }

.article-card:hover .article-card-title,
.article-card:hover .article-card-title a {
  color: var(--accent-emerald);
}

.article-card-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.55;
  margin-bottom: 1.25rem;
  flex: 1;
}

.article-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 0.875rem;
  border-top: 1px dashed var(--border-primary);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.article-card-stats {
  display: flex;
  align-items: center;
  gap: 12px;
}

.stat-item {
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

/* List / Compact View for Articles */
.articles-list {
  display: flex;
  flex-direction: column;
  gap: 0.875rem;
}

.article-list-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.25rem;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-primary);
  text-decoration: none;
  color: inherit;
  transition: all var(--transition-fast);
}

@media (max-width: 640px) {
  .article-list-item {
    flex-direction: column;
    align-items: flex-start;
  }
}

.article-list-item:hover {
  border-color: var(--accent-emerald-border);
  transform: translateX(3px);
}

.list-item-content {
  flex: 1;
}

.list-item-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 0.375rem;
}

.list-item-title {
  font-family: var(--font-heading);
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--text-primary);
  transition: color var(--transition-fast);
}

.article-list-item:hover .list-item-title {
  color: var(--accent-emerald);
}

/* Grid/List View Switcher Buttons */
.view-mode-toggle {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--border-primary);
  background-color: var(--bg-surface);
  padding: 2px;
}

.view-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: none;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.view-btn.active,
.view-btn[aria-pressed="true"] {
  background-color: var(--bg-subtle);
  color: var(--accent-emerald);
}

/* --- Tools & Gists Section Cards --- */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 260px), 1fr));
  gap: 1.25rem;
}

.tool-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-primary);
  padding: 1.25rem;
  transition: all var(--transition-fast);
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
}

.tool-card:hover {
  border-color: var(--accent-emerald-border);
  transform: translateY(-2px);
}

.tool-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--accent-emerald-subtle);
  color: var(--accent-emerald);
  margin-bottom: 1rem;
}

.tool-title {
  font-family: var(--font-heading);
  font-size: 1.0625rem;
  font-weight: 700;
  margin-bottom: 0.375rem;
}

.tool-desc {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* --- Newsletter Banner --- */
.newsletter-banner {
  position: relative;
  background-color: var(--bg-surface);
  border: 1px dashed var(--blueprint-guide);
  padding: clamp(1.5rem, 4vw, 2.5rem);
  margin: 2rem 0;
  overflow: hidden;
  }

.newsletter-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
  position: relative;
  z-index: 2;
}

.newsletter-text h2,
.newsletter-text h3 {
  font-family: var(--font-heading);
  font-size: clamp(1.25rem, 2.5vw, 1.5rem);
  font-weight: 750;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.newsletter-text p {
  font-size: 0.9375rem;
  color: var(--text-secondary);
}

.newsletter-form {
  display: flex;
  gap: 0.5rem;
  flex: 1;
  max-width: 460px;
}

@media (max-width: 640px) {
  .newsletter-inner {
    flex-direction: column;
    align-items: stretch;
  }
  .newsletter-form {
    flex-direction: column;
    max-width: 100%;
  }
}

.form-input {
  flex: 1;
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  padding: 0.625rem 1rem;
  min-height: var(--touch-target-min);
  background-color: var(--bg-primary);
  border: 1px solid var(--border-secondary);
  color: var(--text-primary);
  outline: none;
  transition: all var(--transition-fast);
}

.form-input:focus-visible {
  border-color: var(--accent-emerald);
  outline: none;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  font-weight: 600;
  padding: 0.625rem 1.25rem;
  min-height: var(--touch-target-min);
  background-color: var(--accent-emerald-subtle);
  color: var(--accent-emerald);
  border: 1px solid var(--accent-emerald-border);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  text-decoration: none;
}

.btn-primary:hover {
  filter: brightness(1.1);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  font-weight: 600;
  padding: 0.625rem 1.25rem;
  min-height: var(--touch-target-min);
  background-color: var(--bg-surface);
  color: var(--text-primary);
  border: 1px solid var(--border-primary);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.btn-secondary:hover {
  border-color: var(--accent-emerald-border);
  background-color: var(--bg-subtle);
}

/* --- Footer (Matching Reference) --- */
.site-footer {
  position: relative;
  margin-top: auto;
  border-top: 1px solid var(--border-primary);
  background-color: var(--bg-surface);
  padding: clamp(2rem, 4vw, 3rem) 0 2rem;
  z-index: 2;
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.footer-intro {
  font-size: clamp(0.875rem, 1.5vw, 0.9375rem);
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 2rem;
  max-width: 800px;
}

.footer-bottom-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.25rem;
  padding-top: 1.5rem;
  border-top: 1px dashed var(--border-primary);
}

.footer-socials {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.social-icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  min-width: 44px;
  min-height: 44px;
  background-color: var(--bg-subtle);
  color: var(--text-secondary);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.social-icon-btn:hover {
  color: var(--accent-emerald);
  background-color: var(--accent-emerald-subtle);
  transform: translateY(-2px);
}

/* Footer Theme Selector Dropdown */
.theme-selector-box {
  position: relative;
  display: inline-flex;
  align-items: center;
}

.theme-dropdown-select {
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 500;
  min-height: var(--touch-target-min);
  padding: 0.4rem 2.25rem 0.4rem 0.875rem;
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-primary);
  color: var(--text-primary);
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
  outline: none;
  transition: all var(--transition-fast);
}

.theme-dropdown-select:hover,
.theme-dropdown-select:focus-visible {
  border-color: var(--accent-emerald-border);
}

.theme-dropdown-icon {
  position: absolute;
  right: 12px;
  pointer-events: none;
  color: var(--text-muted);
}

.footer-copyright {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--text-muted);
  width: 100%;
  margin-top: 1rem;
}

/* --- Search Modal (Cmd+K) --- */
.search-modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--modal-backdrop);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: max(1.5rem, env(safe-area-inset-top)) 1rem 2rem;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.search-modal.active {
  opacity: 1;
  visibility: visible;
}

.search-dialog {
  width: 100%;
  max-width: 620px;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-secondary);
  overflow: hidden;
  transform: translateY(-20px) scale(0.98);
  transition: transform var(--transition-normal);
}

.search-modal.active .search-dialog {
  transform: translateY(0) scale(1);
}

.search-input-header {
  display: flex;
  align-items: center;
  padding: 0.875rem 1.25rem;
  border-bottom: 1px solid var(--border-primary);
  gap: 12px;
}

.search-input-header input {
  flex: 1;
  font-family: var(--font-sans);
  font-size: 1.0625rem;
  background: transparent;
  border: none;
  outline: none;
  color: var(--text-primary);
  min-height: var(--touch-target-min);
}

.search-results-list {
  max-height: clamp(240px, 50vh, 400px);
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  padding: 0.75rem;
  list-style: none;
}

.search-item {
  display: flex;
  flex-direction: column;
  padding: 0.75rem 1rem;
  text-decoration: none;
  color: inherit;
  transition: background-color var(--transition-fast);
}

.search-item:hover,
.search-item.selected,
.search-item:focus-visible {
  background-color: var(--accent-emerald-subtle);
  border-left: 3px solid var(--accent-emerald);
  padding-left: calc(1rem - 3px);
}

.search-item-title {
  font-weight: 600;
  font-size: 0.9375rem;
  color: var(--text-primary);
  margin-bottom: 2px;
}

.search-item-desc {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.search-dialog-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.625rem 1.25rem;
  background-color: var(--bg-subtle);
  border-top: 1px solid var(--border-primary);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* --- Reading Progress Bar --- */
.reading-progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0%;
  background: linear-gradient(to right, var(--bg-surface-elevated), var(--accent-emerald));
  z-index: 1001;
  transition: width 0.1s linear;
}

/* --- Mobile Navigation Drawer (Full Responsive) --- */
@media (max-width: 860px) {
  .nav-menu {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    height: calc(100vh - var(--header-height));
    background-color: var(--bg-surface-elevated);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    flex-direction: column;
    align-items: stretch;
    padding: 1.5rem;
    gap: 0.75rem;
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    z-index: 99;
    overflow-y: auto;
    border-bottom: 1px solid var(--border-primary);
  }

  .nav-menu.mobile-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav-link {
    width: 100%;
    font-size: 1.125rem;
    padding: 0.875rem 1rem;
    background-color: var(--bg-subtle);
  }

  .nav-link.active::after,
  .nav-link[aria-current="page"]::after {
    left: 1rem;
    bottom: 0;
    transform: none;
    width: calc(100% - 2rem);
  }

  .mobile-nav-toggle {
    display: inline-flex;
  }

  .btn-search-trigger .search-label,
  .btn-search-trigger .search-kbd {
    display: none;
  }

  .btn-search-trigger {
    padding: 0;
    width: 44px;
    height: 44px;
    justify-content: center;
  }
}

/* ==========================================================================
   --- Tools Page & Interactive Utilities Styles ---
   ========================================================================== */

.tools-page-header {
  padding: 3rem 0 2rem;
  position: relative;
}

.tools-header-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.tools-page-title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 800;
  line-height: 1.15;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
  letter-spacing: -0.02em;
}

.tools-page-desc {
  font-size: 1.0625rem;
  color: var(--text-secondary);
  max-width: 760px;
  line-height: 1.6;
  margin-bottom: 2rem;
}

/* Tools Filter & Search Bar */
.tools-filter-bar {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-primary);
  padding: 1rem;
  margin-bottom: 2.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  position: sticky;
  top: calc(var(--header-height) + 12px);
  z-index: 30;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.tools-filter-top {
  display: flex;
  gap: 1rem;
  align-items: center;
  flex-wrap: wrap;
}

.tools-search-box {
  flex: 1;
  min-width: 240px;
  position: relative;
}

.tools-search-box svg {
  position: absolute;
  left: 0.875rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
}

.tools-search-input {
  width: 100%;
  padding: 0.625rem 1rem 0.625rem 2.625rem;
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-primary);
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.tools-search-input:focus {
  outline: none;
  border-color: var(--accent-emerald);
  background-color: var(--bg-surface);
}

.tools-cat-tabs {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  align-items: center;
}

.tools-cat-btn {
  padding: 0.5rem 1rem;
  border: 1px solid var(--border-primary);
  background-color: var(--bg-subtle);
  color: var(--text-secondary);
  font-size: 0.8125rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  min-height: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.tools-cat-btn:hover {
  background-color: var(--bg-card-hover);
  border-color: var(--accent-emerald-border);
  color: var(--text-primary);
}

.tools-cat-btn.active,
.tools-cat-btn[aria-pressed="true"] {
  background-color: var(--accent-emerald);
  border-color: var(--accent-emerald);
  color: #ffffff;
}

/* Quick Jump Anchor Pills */
.tools-quick-pills {
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  padding-bottom: 0.25rem;
  scrollbar-width: thin;
}

.tools-quick-link {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 0.35rem 0.65rem;
  background-color: var(--bg-secondary);
  color: var(--text-muted);
  text-decoration: none;
  border: 1px solid var(--border-subtle);
  white-space: nowrap;
  transition: all var(--transition-fast);
}

.tools-quick-link:hover {
  color: var(--accent-emerald);
  border-color: var(--accent-emerald-border);
  background-color: var(--accent-emerald-subtle);
}

/* --- Blueprint Link Cards Grid (Tools & Projects) --- */
.blueprint-section-block {
  margin-bottom: 3.5rem;
}

.blueprint-section-header {
  margin-bottom: 1.5rem;
}

.blueprint-cards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

@media (max-width: 992px) {
  .blueprint-cards-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 600px) {
  .blueprint-cards-grid {
    grid-template-columns: 1fr;
  }
}

.blueprint-link-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-primary);
  padding: 1.35rem 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 145px;
  text-decoration: none;
  color: inherit;
  position: relative;
  overflow: hidden;
  transition: all var(--transition-fast);
}

.blueprint-link-card:hover {
  border-color: var(--accent-emerald);
  transform: translateY(-2px);
  background-color: var(--bg-card-hover);
}

.blueprint-link-card:focus-visible {
  outline: 2px solid var(--focus-ring-color);
  outline-offset: 2px;
}

.blueprint-card-top {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.blueprint-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  margin-bottom: 0.25rem;
}

.blueprint-card-badge {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  padding: 2px 7px;
  background-color: var(--accent-emerald-subtle);
  color: var(--accent-emerald);
  border: 1px solid var(--accent-emerald-border);
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

.blueprint-card-badge.featured {
  background-color: rgba(245, 158, 11, 0.12);
  color: var(--accent-amber);
  border-color: rgba(245, 158, 11, 0.3);
}

.blueprint-card-title {
  font-family: var(--font-heading);
  font-size: 1.0625rem;
  font-weight: 700;
  line-height: 1.45;
  color: var(--text-primary);
  margin: 0;
  transition: color var(--transition-fast);
}

.blueprint-link-card:hover .blueprint-card-title {
  color: var(--accent-emerald);
}

.blueprint-card-url {
  margin-top: auto;
  padding-top: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

.blueprint-link-card:hover .blueprint-card-url {
  color: var(--accent-emerald);
}

.blueprint-card-url svg {
  transition: transform var(--transition-fast);
  flex-shrink: 0;
}

.blueprint-link-card:hover .blueprint-card-url svg {
  transform: translate(2px, -2px);
}

/* Tool Container Section */
.tool-section {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-primary);
  margin-bottom: 2.5rem;
  position: relative;
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.tool-section:target,
.tool-section:focus-within {
  border-color: var(--accent-emerald-border);
}

.tool-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border-primary);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  background-color: var(--bg-secondary);
}

.tool-header-left {
  display: flex;
  align-items: center;
  gap: 0.875rem;
}

.tool-header-icon {
  width: 40px;
  height: 40px;
  background-color: var(--accent-emerald-subtle);
  color: var(--accent-emerald);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.tool-header-title {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
}

.tool-header-meta {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.tool-workbench {
  padding: 1.5rem;
}

.tool-btn-copy {
  padding: 0.375rem 0.75rem;
  font-size: 0.8125rem;
  font-family: var(--font-sans);
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  color: var(--text-secondary);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  transition: all var(--transition-fast);
}

.tool-btn-copy:hover {
  color: var(--accent-emerald);
  border-color: var(--accent-emerald);
  background-color: var(--accent-emerald-subtle);
}

.tool-btn-copy.copied {
  background-color: rgba(4, 120, 87, 0.15);
  border-color: var(--accent-emerald);
  color: var(--accent-emerald);
}

/* Tool Input & Outline Button Styles */
.tool-input {
  width: 100%;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  padding: 0.5rem 0.875rem;
  min-height: 38px;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-primary);
  color: var(--text-primary);
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-fast);
  box-sizing: border-box;
}

.tool-input::placeholder {
  color: var(--text-muted);
}

.tool-input:hover {
  border-color: var(--border-hover);
}

.tool-input:focus,
.tool-input:focus-visible {
  border-color: var(--accent-emerald);
  background-color: var(--bg-surface);
  outline: none;
}

.tool-btn-outline {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  padding: 0.35rem 0.75rem;
  min-height: 32px;
  border: 1px solid var(--border-primary);
  background-color: var(--bg-surface);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  user-select: none;
  touch-action: manipulation;
}

.tool-btn-outline:hover {
  color: var(--text-primary);
  border-color: var(--accent-emerald-border);
  background-color: var(--bg-subtle);
}

.tool-btn-outline:focus-visible {
  outline: 2px solid var(--focus-ring-color);
  outline-offset: 2px;
  border-color: var(--accent-emerald);
}

.tool-btn-outline.active,
.tool-btn-outline[aria-pressed="true"] {
  color: var(--accent-emerald);
  background-color: var(--accent-emerald-subtle);
  border-color: var(--accent-emerald);
  font-weight: 600;
}

.tool-btn-outline:active {
  transform: translateY(1px);
}

/* One-Liners Catalog */
.oneliners-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.oneliner-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  padding: 1rem 1.25rem;
  transition: all var(--transition-fast);
}

.oneliner-card:hover {
  border-color: var(--accent-emerald-border);
}

.oneliner-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
  flex-wrap: wrap;
}

.oneliner-title {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-primary);
}

.oneliner-code-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-subtle);
  padding: 0.5rem 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
}

.oneliner-code {
  color: var(--accent-emerald);
  overflow-x: auto;
  white-space: nowrap;
  font-family: var(--font-mono);
}

.blueprint-param-tag {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  padding: 2px 6px;
  background-color: var(--accent-emerald-subtle);
  color: var(--accent-emerald);
  border: 1px solid var(--accent-emerald-border);
}

/* --- RSS Feed Links & Badges --- */
.section-actions {
  display: inline-flex;
  align-items: center;
  gap: 0.875rem;
  flex-wrap: wrap;
}

.rss-link-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  padding: 0.35rem 0.65rem;
  min-height: 32px;
  background-color: var(--bg-surface);
  color: var(--text-secondary);
  border: 1px solid var(--border-primary);
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  line-height: 1;
}

.rss-link-badge svg {
  color: #ea580c;
  flex-shrink: 0;
  transition: transform var(--transition-fast);
}

[data-theme="dark"] .rss-link-badge svg {
  color: #fb923c;
}

.rss-link-badge:hover {
  color: var(--text-primary);
  border-color: rgba(234, 88, 12, 0.4);
  background-color: rgba(234, 88, 12, 0.06);
}

[data-theme="dark"] .rss-link-badge:hover {
  border-color: rgba(251, 146, 60, 0.4);
  background-color: rgba(251, 146, 60, 0.1);
}

.rss-link-badge:hover svg {
  transform: scale(1.15);
}

.btn-icon.btn-rss svg {
  color: var(--text-secondary);
  transition: color var(--transition-fast), transform var(--transition-fast);
}

.btn-icon.btn-rss:hover svg {
  color: #ea580c;
  transform: scale(1.12);
}

[data-theme="dark"] .btn-icon.btn-rss:hover svg {
  color: #fb923c;
}

.btn-icon.btn-rss:hover {
  border-color: rgba(234, 88, 12, 0.35);
  background-color: rgba(234, 88, 12, 0.08);
}

[data-theme="dark"] .btn-icon.btn-rss:hover {
  border-color: rgba(251, 146, 60, 0.35);
  background-color: rgba(251, 146, 60, 0.12);
}