/* ============================================================
   Maxi's Computers Corporation — Engineering Wiki
   style.css | Version 1.0.0
   Design: Futuristic Dark Mode · Glassmorphism · Neon Accents
   ============================================================ */

/* ── Google Fonts ────────────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500;700&family=Orbitron:wght@400;500;700;900&display=swap');

/* ── CSS Custom Properties ───────────────────────────────── */
:root {
  /* Color Palette */
  --clr-bg-deep:       #020408;
  --clr-bg-primary:    #050c14;
  --clr-bg-secondary:  #080f1a;
  --clr-bg-card:       #0a1628;
  --clr-surface:       rgba(10, 22, 40, 0.85);
  --clr-surface-alt:   rgba(14, 28, 52, 0.75);

  --clr-neon-cyan:     #00d4ff;
  --clr-neon-green:    #00ff88;
  --clr-neon-purple:   #7c3aed;
  --clr-neon-pink:     #f472b6;
  --clr-neon-orange:   #ff7a00;

  --clr-accent:        #00d4ff;
  --clr-accent-dim:    rgba(0, 212, 255, 0.15);
  --clr-accent-glow:   rgba(0, 212, 255, 0.4);

  --clr-text-primary:  #e2eaf4;
  --clr-text-secondary:#8fa8c8;
  --clr-text-muted:    #4a6680;
  --clr-text-inverse:  #020408;

  --clr-border:        rgba(0, 212, 255, 0.12);
  --clr-border-hover:  rgba(0, 212, 255, 0.35);
  --clr-border-strong: rgba(0, 212, 255, 0.6);

  --clr-glass-bg:      rgba(5, 15, 30, 0.7);
  --clr-glass-border:  rgba(0, 212, 255, 0.15);

  /* Category Colors */
  --cat-devops:    #00d4ff;
  --cat-cloud:     #7c3aed;
  --cat-k8s:       #326ce5;
  --cat-linux:     #00ff88;
  --cat-infra:     #ff7a00;
  --cat-ai:        #f472b6;
  --cat-music:     #fbbf24;
  --cat-internal:  #64748b;

  /* Typography */
  --font-body:     'Inter', system-ui, sans-serif;
  --font-mono:     'JetBrains Mono', 'Fira Code', monospace;
  --font-display:  'Orbitron', 'Inter', sans-serif;

  /* Spacing */
  --space-xs:   0.25rem;
  --space-sm:   0.5rem;
  --space-md:   1rem;
  --space-lg:   1.5rem;
  --space-xl:   2rem;
  --space-2xl:  3rem;
  --space-3xl:  4rem;

  /* Sizes */
  --sidebar-width: 280px;
  --header-height: 64px;
  --border-radius: 12px;
  --border-radius-sm: 6px;
  --border-radius-lg: 20px;

  /* Shadows & Glows */
  --shadow-card:    0 4px 24px rgba(0,0,0,0.6);
  --shadow-glow:    0 0 20px rgba(0,212,255,0.25);
  --shadow-glow-lg: 0 0 40px rgba(0,212,255,0.35);
  --shadow-inset:   inset 0 1px 0 rgba(0,212,255,0.1);

  /* Transitions */
  --transition-fast:   150ms ease;
  --transition-base:   250ms ease;
  --transition-slow:   400ms ease;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 1rem);
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  background-color: var(--clr-bg-deep);
  color: var(--clr-text-primary);
  line-height: 1.7;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ── Animated Background ─────────────────────────────────── */
.bg-canvas {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

.bg-canvas::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 20% 10%, rgba(0,212,255,0.06) 0%, transparent 60%),
    radial-gradient(ellipse 60% 80% at 80% 90%, rgba(124,58,237,0.06) 0%, transparent 60%),
    radial-gradient(ellipse 50% 50% at 50% 50%, rgba(0,255,136,0.03) 0%, transparent 70%);
  animation: bgPulse 8s ease-in-out infinite alternate;
}

.bg-canvas::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0,212,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,212,255,0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 70% 70% at 50% 50%, black 30%, transparent 100%);
}

@keyframes bgPulse {
  from { opacity: 0.6; transform: scale(1); }
  to   { opacity: 1;   transform: scale(1.05); }
}

.bg-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  animation: orbFloat 12s ease-in-out infinite;
}
.bg-orb-1 {
  width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(0,212,255,0.12) 0%, transparent 70%);
  top: -200px; left: -200px;
  animation-delay: 0s;
}
.bg-orb-2 {
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(124,58,237,0.1) 0%, transparent 70%);
  bottom: -300px; right: -200px;
  animation-delay: -4s;
}
.bg-orb-3 {
  width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(0,255,136,0.07) 0%, transparent 70%);
  top: 50%; right: 20%;
  animation-delay: -8s;
}

@keyframes orbFloat {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33%       { transform: translate(30px, -20px) scale(1.05); }
  66%       { transform: translate(-20px, 30px) scale(0.95); }
}

/* ── Layout Wrapper ──────────────────────────────────────── */
.page-wrapper {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ── Header / Navigation ─────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  display: flex;
  align-items: center;
  padding: 0 var(--space-xl);
  background: rgba(2, 4, 8, 0.85);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--clr-border);
  box-shadow: 0 1px 0 var(--clr-border), 0 4px 20px rgba(0,0,0,0.5);
}

.site-header nav {
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  text-decoration: none;
  flex-shrink: 0;
}

.nav-brand-icon {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  object-fit: cover;
  box-shadow: 0 0 12px var(--clr-accent-glow);
}

.nav-brand-text {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--clr-accent);
  text-shadow: 0 0 15px var(--clr-accent-glow);
  line-height: 1.2;
}

.nav-brand-sub {
  font-family: var(--font-body);
  font-size: 0.65rem;
  font-weight: 400;
  letter-spacing: 0.15em;
  color: var(--clr-text-muted);
  text-transform: uppercase;
}

.nav-search {
  flex: 1;
  max-width: 480px;
  margin: 0 auto;
  position: relative;
}

.nav-search-input {
  width: 100%;
  padding: 0.5rem 1rem 0.5rem 2.75rem;
  background: var(--clr-glass-bg);
  border: 1px solid var(--clr-border);
  border-radius: 50px;
  color: var(--clr-text-primary);
  font-family: var(--font-body);
  font-size: 0.875rem;
  outline: none;
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.nav-search-input::placeholder { color: var(--clr-text-muted); }

.nav-search-input:focus {
  border-color: var(--clr-border-hover);
  box-shadow: 0 0 0 3px var(--clr-accent-dim), var(--shadow-glow);
}

.nav-search-icon {
  position: absolute;
  left: 0.9rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--clr-text-muted);
  pointer-events: none;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  list-style: none;
  flex-shrink: 0;
}

.nav-links a {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.4rem 0.8rem;
  color: var(--clr-text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: var(--border-radius-sm);
  transition: color var(--transition-fast), background var(--transition-fast);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--clr-accent);
  background: var(--clr-accent-dim);
}

.nav-pwa-btn {
  display: none;
  align-items: center;
  gap: 0.35rem;
  padding: 0.4rem 0.9rem;
  background: linear-gradient(135deg, var(--clr-accent), #0099bb);
  color: var(--clr-text-inverse);
  border: none;
  border-radius: 50px;
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.nav-pwa-btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-glow);
}

.nav-pwa-btn.visible { display: flex; }

.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  border-radius: var(--border-radius-sm);
  transition: background var(--transition-fast);
  margin-left: auto;
}

.nav-hamburger:hover { background: var(--clr-accent-dim); }

.nav-hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--clr-text-secondary);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.nav-hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-hamburger.open span:nth-child(2) { opacity: 0; }
.nav-hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ── Search Results Overlay ──────────────────────────────── */
#search-results {
  position: absolute;
  top: calc(100% + 0.5rem);
  left: 0; right: 0;
  background: var(--clr-bg-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-card), var(--shadow-glow);
  z-index: 200;
  max-height: 420px;
  overflow-y: auto;
  display: none;
}

#search-results.visible { display: block; }

#search-results .result-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
  padding: 0.75rem 1rem;
  text-decoration: none;
  border-bottom: 1px solid var(--clr-border);
  transition: background var(--transition-fast);
}

#search-results .result-item:last-child { border-bottom: none; }
#search-results .result-item:hover { background: var(--clr-accent-dim); }

#search-results .result-icon {
  width: 32px; height: 32px;
  border-radius: var(--border-radius-sm);
  display: flex; align-items: center; justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
  margin-top: 2px;
}

#search-results .result-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--clr-text-primary);
}

#search-results .result-desc {
  font-size: 0.75rem;
  color: var(--clr-text-muted);
  margin-top: 2px;
}

#search-results .result-category {
  font-size: 0.7rem;
  color: var(--clr-accent);
  margin-top: 2px;
}

#search-results .no-results {
  padding: 1.5rem;
  text-align: center;
  color: var(--clr-text-muted);
  font-size: 0.875rem;
}

/* ── Main Layout (Sidebar + Content) ─────────────────────── */
.main-layout {
  display: flex;
  flex: 1;
  max-width: 1400px;
  width: 100%;
  margin: 0 auto;
  padding: var(--space-xl);
  gap: var(--space-xl);
  align-items: flex-start;
}

/* ── Sidebar ─────────────────────────────────────────────── */
.sidebar {
  width: var(--sidebar-width);
  flex-shrink: 0;
  position: sticky;
  top: calc(var(--header-height) + var(--space-xl));
  max-height: calc(100vh - var(--header-height) - 3rem);
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--clr-border) transparent;
}

.sidebar::-webkit-scrollbar { width: 4px; }
.sidebar::-webkit-scrollbar-thumb { background: var(--clr-border); border-radius: 2px; }

.sidebar-section { margin-bottom: var(--space-xl); }

.sidebar-title {
  font-family: var(--font-display);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--clr-text-muted);
  text-transform: uppercase;
  padding: 0 var(--space-sm) var(--space-sm);
  border-bottom: 1px solid var(--clr-border);
  margin-bottom: var(--space-sm);
}

.sidebar-nav { list-style: none; }

.sidebar-nav li a {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.5rem var(--space-sm);
  color: var(--clr-text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: var(--border-radius-sm);
  transition: color var(--transition-fast), background var(--transition-fast), padding-left var(--transition-fast);
  border-left: 2px solid transparent;
}

.sidebar-nav li a:hover {
  color: var(--clr-text-primary);
  background: var(--clr-accent-dim);
  padding-left: calc(var(--space-sm) + 4px);
  border-left-color: var(--clr-accent);
}

.sidebar-nav li a.active {
  color: var(--clr-accent);
  background: var(--clr-accent-dim);
  border-left-color: var(--clr-accent);
}

.sidebar-nav .nav-icon { font-size: 1rem; width: 20px; text-align: center; }

.sidebar-badge {
  margin-left: auto;
  font-size: 0.65rem;
  font-weight: 700;
  padding: 1px 7px;
  border-radius: 50px;
  background: var(--clr-accent-dim);
  color: var(--clr-accent);
}

/* ── Main Content ────────────────────────────────────────── */
.main-content {
  flex: 1;
  min-width: 0;
}

/* ── Glass Card ──────────────────────────────────────────── */
.glass-card {
  background: var(--clr-glass-bg);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border: 1px solid var(--clr-glass-border);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-card), var(--shadow-inset);
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.glass-card:hover {
  border-color: var(--clr-border-hover);
  box-shadow: var(--shadow-card), var(--shadow-glow), var(--shadow-inset);
}

/* ── Hero Section ────────────────────────────────────────── */
.hero {
  padding: var(--space-3xl) var(--space-xl);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 80% 60% at 50% 0%, rgba(0,212,255,0.08) 0%, transparent 70%);
  pointer-events: none;
}

.hero-label {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--clr-accent);
  background: var(--clr-accent-dim);
  padding: 0.35rem 1rem;
  border-radius: 50px;
  border: 1px solid var(--clr-border);
  margin-bottom: var(--space-lg);
}

.hero-label-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--clr-neon-green);
  box-shadow: 0 0 6px var(--clr-neon-green);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%       { opacity: 0.6; transform: scale(0.8); }
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 900;
  letter-spacing: 0.02em;
  line-height: 1.1;
  margin-bottom: var(--space-lg);
  color: var(--clr-text-primary);
}

.hero-title span {
  background: linear-gradient(135deg, var(--clr-neon-cyan), var(--clr-neon-green) 50%, var(--clr-neon-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  background-size: 200% 200%;
  animation: gradientShift 4s ease-in-out infinite;
}

@keyframes gradientShift {
  0%   { background-position: 0% 50%; }
  50%  { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

.hero-desc {
  font-size: 1.1rem;
  color: var(--clr-text-secondary);
  max-width: 580px;
  margin: 0 auto var(--space-2xl);
  line-height: 1.7;
}

/* ── Hero Search ─────────────────────────────────────────── */
.hero-search {
  max-width: 600px;
  margin: 0 auto var(--space-2xl);
  position: relative;
}

.hero-search-input {
  width: 100%;
  padding: 1rem 1.25rem 1rem 3.25rem;
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: 50px;
  color: var(--clr-text-primary);
  font-family: var(--font-body);
  font-size: 1rem;
  outline: none;
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
  box-shadow: var(--shadow-card);
}

.hero-search-input::placeholder { color: var(--clr-text-muted); }

.hero-search-input:focus {
  border-color: var(--clr-accent);
  box-shadow: 0 0 0 4px var(--clr-accent-dim), var(--shadow-glow-lg);
}

.hero-search-icon {
  position: absolute;
  left: 1.25rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--clr-accent);
  font-size: 1.1rem;
  pointer-events: none;
}

.hero-search-results {
  position: absolute;
  top: calc(100% + 0.5rem);
  left: 0; right: 0;
  background: var(--clr-bg-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-card), var(--shadow-glow);
  z-index: 200;
  max-height: 400px;
  overflow-y: auto;
  display: none;
  text-align: left;
}

.hero-search-results.visible { display: block; }

/* ── Stats Row ───────────────────────────────────────────── */
.stats-row {
  display: flex;
  justify-content: center;
  gap: var(--space-xl);
  flex-wrap: wrap;
  margin-bottom: var(--space-2xl);
}

.stat-item {
  text-align: center;
}

.stat-number {
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--clr-accent);
  text-shadow: 0 0 20px var(--clr-accent-glow);
}

.stat-label {
  font-size: 0.75rem;
  color: var(--clr-text-muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* ── Section Headers ─────────────────────────────────────── */
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-lg);
}

.section-title {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--clr-text-primary);
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.section-title::before {
  content: '';
  display: inline-block;
  width: 3px;
  height: 1em;
  background: linear-gradient(to bottom, var(--clr-accent), var(--clr-neon-green));
  border-radius: 2px;
}

.section-link {
  font-size: 0.8rem;
  color: var(--clr-accent);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition-fast);
}

.section-link:hover { color: var(--clr-neon-green); }

/* ── Category Cards Grid ─────────────────────────────────── */
.categories-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--space-md);
  margin-bottom: var(--space-2xl);
}

.category-card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-sm);
  padding: var(--space-lg);
  text-decoration: none;
  border-radius: var(--border-radius);
  border: 1px solid var(--clr-border);
  background: var(--clr-glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  transition: transform var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
  position: relative;
  overflow: hidden;
}

.category-card::before {
  content: '';
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity var(--transition-base);
}

.category-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card), 0 0 25px var(--cat-color, rgba(0,212,255,0.2));
}

.category-card:hover::before { opacity: 1; }

.category-card[data-cat="devops"] { --cat-color: rgba(0,212,255,0.2); }
.category-card[data-cat="devops"]:hover { border-color: var(--cat-devops); }
.category-card[data-cat="cloud"] { --cat-color: rgba(124,58,237,0.2); }
.category-card[data-cat="cloud"]:hover { border-color: var(--cat-cloud); }
.category-card[data-cat="infrastructure"] { --cat-color: rgba(255,122,0,0.2); }
.category-card[data-cat="infrastructure"]:hover { border-color: var(--cat-infra); }

.category-icon {
  font-size: 2rem;
  line-height: 1;
  filter: drop-shadow(0 0 8px currentColor);
}

.category-name {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--clr-text-primary);
}

.category-count {
  font-size: 0.75rem;
  color: var(--clr-text-muted);
}

/* ── Article Cards Grid ──────────────────────────────────── */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-md);
  margin-bottom: var(--space-2xl);
}

.article-card {
  display: flex;
  flex-direction: column;
  padding: var(--space-lg);
  text-decoration: none;
  border-radius: var(--border-radius);
  border: 1px solid var(--clr-border);
  background: var(--clr-glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  transition: transform var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
  position: relative;
  overflow: hidden;
}

.article-card::after {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--clr-accent), transparent);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.article-card:hover {
  transform: translateY(-3px);
  border-color: var(--clr-border-hover);
  box-shadow: var(--shadow-card), var(--shadow-glow);
}

.article-card:hover::after { opacity: 1; }

.article-card-meta {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-sm);
}

.article-badge {
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 2px 8px;
  border-radius: 50px;
}

.badge-devops   { background: rgba(0,212,255,0.15);  color: var(--cat-devops);  border: 1px solid rgba(0,212,255,0.3); }
.badge-cloud    { background: rgba(124,58,237,0.15); color: var(--cat-cloud);   border: 1px solid rgba(124,58,237,0.3); }
.badge-k8s      { background: rgba(50,108,229,0.15); color: var(--cat-k8s);     border: 1px solid rgba(50,108,229,0.3); }
.badge-linux    { background: rgba(0,255,136,0.12);  color: var(--cat-linux);   border: 1px solid rgba(0,255,136,0.3); }
.badge-infra    { background: rgba(255,122,0,0.12);  color: var(--cat-infra);   border: 1px solid rgba(255,122,0,0.3); }
.badge-ai       { background: rgba(244,114,182,0.12);color: var(--cat-ai);      border: 1px solid rgba(244,114,182,0.3); }
.badge-music    { background: rgba(251,191,36,0.12); color: var(--cat-music);   border: 1px solid rgba(251,191,36,0.3); }
.badge-internal { background: rgba(100,116,139,0.15);color: var(--cat-internal);border: 1px solid rgba(100,116,139,0.3); }

.article-card-time {
  font-size: 0.7rem;
  color: var(--clr-text-muted);
  margin-left: auto;
}

.article-card-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--clr-text-primary);
  margin-bottom: var(--space-sm);
  line-height: 1.4;
}

.article-card-desc {
  font-size: 0.875rem;
  color: var(--clr-text-secondary);
  line-height: 1.6;
  flex: 1;
}

.article-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: var(--space-md);
  padding-top: var(--space-sm);
  border-top: 1px solid var(--clr-border);
}

.article-card-read {
  font-size: 0.75rem;
  color: var(--clr-text-muted);
}

.article-card-arrow {
  color: var(--clr-accent);
  font-size: 1rem;
  transition: transform var(--transition-fast);
}

.article-card:hover .article-card-arrow { transform: translateX(4px); }

/* ── Article Page Layout ─────────────────────────────────── */
.article-layout {
  display: grid;
  grid-template-columns: 1fr 240px;
  gap: var(--space-xl);
  align-items: start;
}

.article-body {
  min-width: 0;
}

.article-header {
  margin-bottom: var(--space-2xl);
  padding-bottom: var(--space-xl);
  border-bottom: 1px solid var(--clr-border);
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
  color: var(--clr-text-muted);
  margin-bottom: var(--space-md);
  flex-wrap: wrap;
}

.breadcrumb a {
  color: var(--clr-text-muted);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.breadcrumb a:hover { color: var(--clr-accent); }
.breadcrumb .sep { color: var(--clr-border-strong); }
.breadcrumb .current { color: var(--clr-text-secondary); }

.article-title {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 4vw, 2.25rem);
  font-weight: 900;
  color: var(--clr-text-primary);
  line-height: 1.2;
  margin-bottom: var(--space-md);
}

.article-meta-row {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.article-meta-item {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.8rem;
  color: var(--clr-text-muted);
}

.article-meta-item svg { opacity: 0.6; }

/* ── Article Content Styles ──────────────────────────────── */
.article-content {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--clr-text-primary);
}

.article-content h2 {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--clr-accent);
  margin: var(--space-2xl) 0 var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--clr-border);
  letter-spacing: 0.05em;
}

.article-content h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--clr-text-primary);
  margin: var(--space-xl) 0 var(--space-sm);
}

.article-content h4 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--clr-text-secondary);
  margin: var(--space-lg) 0 var(--space-sm);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.article-content p {
  margin-bottom: var(--space-md);
  color: var(--clr-text-secondary);
}

.article-content a {
  color: var(--clr-accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-fast);
}

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

.article-content ul,
.article-content ol {
  margin: var(--space-md) 0;
  padding-left: var(--space-xl);
  color: var(--clr-text-secondary);
}

.article-content li {
  margin-bottom: var(--space-xs);
}

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

.article-content strong { color: var(--clr-text-primary); font-weight: 600; }
.article-content em { color: var(--clr-neon-green); font-style: italic; }

.article-content blockquote {
  border-left: 3px solid var(--clr-accent);
  padding: var(--space-md) var(--space-lg);
  background: var(--clr-accent-dim);
  border-radius: 0 var(--border-radius-sm) var(--border-radius-sm) 0;
  margin: var(--space-lg) 0;
  color: var(--clr-text-secondary);
  font-style: italic;
}

/* ── Code Blocks ─────────────────────────────────────────── */
.code-block {
  position: relative;
  margin: var(--space-lg) 0;
  border-radius: var(--border-radius);
  overflow: hidden;
  border: 1px solid var(--clr-border);
  box-shadow: var(--shadow-card);
}

.code-block-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.6rem 1rem;
  background: rgba(0,0,0,0.5);
  border-bottom: 1px solid var(--clr-border);
}

.code-block-dots {
  display: flex;
  gap: 6px;
}

.code-block-dots span {
  width: 12px; height: 12px;
  border-radius: 50%;
}

.dot-red   { background: #ff5f57; }
.dot-yellow{ background: #ffbd2e; }
.dot-green { background: #28c940; }

.code-block-lang {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--clr-text-muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.code-copy-btn {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.3rem 0.75rem;
  background: var(--clr-accent-dim);
  border: 1px solid var(--clr-border);
  border-radius: var(--border-radius-sm);
  color: var(--clr-accent);
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 500;
  cursor: pointer;
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.code-copy-btn:hover {
  background: rgba(0,212,255,0.25);
  transform: translateY(-1px);
}

.code-copy-btn.copied {
  background: rgba(0,255,136,0.15);
  border-color: var(--clr-neon-green);
  color: var(--clr-neon-green);
}

.code-block pre {
  padding: var(--space-lg);
  overflow-x: auto;
  background: rgba(2,4,8,0.95);
  margin: 0;
}

.code-block code {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--clr-text-primary);
  tab-size: 2;
}

/* Syntax highlighting via CSS */
.code-block code .kw   { color: #c792ea; }
.code-block code .str  { color: #c3e88d; }
.code-block code .cmt  { color: #546e7a; font-style: italic; }
.code-block code .num  { color: #f78c6c; }
.code-block code .fn   { color: #82aaff; }
.code-block code .var  { color: #eeffff; }
.code-block code .op   { color: #89ddff; }
.code-block code .cls  { color: #ffcb6b; }

/* Inline code */
.article-content code:not(.code-block code) {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--clr-accent-dim);
  color: var(--clr-accent);
  padding: 0.1em 0.4em;
  border-radius: 4px;
  border: 1px solid var(--clr-border);
}

/* ── Table of Contents ───────────────────────────────────── */
.toc {
  position: sticky;
  top: calc(var(--header-height) + var(--space-xl));
  max-height: calc(100vh - var(--header-height) - 3rem);
  overflow-y: auto;
  padding: var(--space-lg);
  background: var(--clr-glass-bg);
  border: 1px solid var(--clr-glass-border);
  border-radius: var(--border-radius);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  scrollbar-width: thin;
  scrollbar-color: var(--clr-border) transparent;
}

.toc-title {
  font-family: var(--font-display);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--clr-text-muted);
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--clr-border);
}

.toc-list {
  list-style: none;
}

.toc-list li a {
  display: block;
  padding: 0.35rem 0.5rem;
  font-size: 0.8rem;
  color: var(--clr-text-muted);
  text-decoration: none;
  border-radius: var(--border-radius-sm);
  border-left: 2px solid transparent;
  transition: color var(--transition-fast), background var(--transition-fast);
  line-height: 1.4;
}

.toc-list li a:hover,
.toc-list li a.active {
  color: var(--clr-accent);
  background: var(--clr-accent-dim);
  border-left-color: var(--clr-accent);
}

.toc-list .toc-h3 a { padding-left: 1.25rem; font-size: 0.75rem; }

/* ── Related Articles ────────────────────────────────────── */
.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: var(--space-md);
  margin-top: var(--space-md);
}

.related-card {
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
  padding: var(--space-md);
  background: var(--clr-glass-bg);
  border: 1px solid var(--clr-border);
  border-radius: var(--border-radius);
  text-decoration: none;
  transition: border-color var(--transition-base), transform var(--transition-base);
}

.related-card:hover {
  border-color: var(--clr-border-hover);
  transform: translateY(-2px);
}

.related-card-icon {
  font-size: 1.5rem;
  flex-shrink: 0;
}

.related-card-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--clr-text-primary);
  margin-bottom: 0.25rem;
}

.related-card-cat {
  font-size: 0.7rem;
  color: var(--clr-text-muted);
}

/* ── Navigation Buttons ──────────────────────────────────── */
.article-nav-buttons {
  display: flex;
  gap: var(--space-md);
  margin-top: var(--space-2xl);
  padding-top: var(--space-xl);
  border-top: 1px solid var(--clr-border);
}

.nav-btn {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex: 1;
  padding: var(--space-md) var(--space-lg);
  background: var(--clr-glass-bg);
  border: 1px solid var(--clr-border);
  border-radius: var(--border-radius);
  text-decoration: none;
  transition: border-color var(--transition-base), background var(--transition-base);
}

.nav-btn:hover {
  border-color: var(--clr-border-hover);
  background: var(--clr-accent-dim);
}

.nav-btn.prev { flex-direction: row-reverse; text-align: right; }

.nav-btn-label {
  font-size: 0.7rem;
  color: var(--clr-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.nav-btn-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--clr-text-primary);
}

/* ── Category Page ───────────────────────────────────────── */
.category-header {
  padding: var(--space-2xl) 0 var(--space-xl);
  border-bottom: 1px solid var(--clr-border);
  margin-bottom: var(--space-xl);
}

.category-hero-icon {
  font-size: 3rem;
  margin-bottom: var(--space-md);
  filter: drop-shadow(0 0 15px currentColor);
}

.category-hero-title {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 4vw, 2.5rem);
  font-weight: 900;
  margin-bottom: var(--space-sm);
}

.category-hero-desc {
  font-size: 1rem;
  color: var(--clr-text-secondary);
  max-width: 600px;
}

/* ── Offline / Error Pages ───────────────────────────────── */
.offline-page {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  text-align: center;
  padding: var(--space-xl);
}

.offline-icon {
  font-size: 5rem;
  margin-bottom: var(--space-lg);
  filter: drop-shadow(0 0 20px var(--clr-accent-glow));
}

.offline-title {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  color: var(--clr-accent);
  margin-bottom: var(--space-md);
}

.offline-desc {
  color: var(--clr-text-secondary);
  max-width: 420px;
  margin-bottom: var(--space-xl);
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.75rem 1.75rem;
  background: linear-gradient(135deg, var(--clr-accent), #0099bb);
  color: var(--clr-text-inverse);
  border: none;
  border-radius: 50px;
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow-lg);
}

/* ── Footer ──────────────────────────────────────────────── */
.site-footer {
  border-top: 1px solid var(--clr-border);
  padding: var(--space-2xl) var(--space-xl);
  margin-top: var(--space-3xl);
  background: rgba(2,4,8,0.6);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.footer-inner {
  max-width: 1400px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-2xl);
}

.footer-brand p {
  font-size: 0.875rem;
  color: var(--clr-text-muted);
  margin-top: var(--space-sm);
  max-width: 280px;
  line-height: 1.6;
}

.footer-col-title {
  font-family: var(--font-display);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--clr-text-muted);
  margin-bottom: var(--space-md);
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.footer-links a {
  font-size: 0.875rem;
  color: var(--clr-text-muted);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-links a:hover { color: var(--clr-accent); }

.footer-bottom {
  max-width: 1400px;
  margin: var(--space-xl) auto 0;
  padding-top: var(--space-lg);
  border-top: 1px solid var(--clr-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.footer-bottom p {
  font-size: 0.8rem;
  color: var(--clr-text-muted);
}

.footer-bottom span {
  color: var(--clr-accent);
}

.footer-status {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.75rem;
  color: var(--clr-neon-green);
}

.footer-status-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--clr-neon-green);
  box-shadow: 0 0 6px var(--clr-neon-green);
  animation: pulse 2s ease-in-out infinite;
}

/* ── Mobile Nav Overlay ──────────────────────────────────── */
.mobile-nav {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 99;
  background: rgba(2,4,8,0.97);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  padding: calc(var(--header-height) + var(--space-xl)) var(--space-xl) var(--space-xl);
  overflow-y: auto;
  flex-direction: column;
}

.mobile-nav.open { display: flex; }

.mobile-nav-section {
  margin-bottom: var(--space-xl);
}

.mobile-nav-title {
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--clr-text-muted);
  text-transform: uppercase;
  margin-bottom: var(--space-sm);
}

.mobile-nav-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.mobile-nav-links a {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md);
  color: var(--clr-text-secondary);
  text-decoration: none;
  font-size: 1.1rem;
  font-weight: 500;
  border-radius: var(--border-radius);
  transition: color var(--transition-fast), background var(--transition-fast);
}

.mobile-nav-links a:hover {
  color: var(--clr-accent);
  background: var(--clr-accent-dim);
}

/* ── Page Transition ─────────────────────────────────────── */
.page-transition {
  animation: fadeInUp 0.4s ease both;
}

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

/* ── Scrollbar ───────────────────────────────────────────── */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--clr-bg-deep); }
::-webkit-scrollbar-thumb { background: var(--clr-border); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--clr-border-hover); }

/* ── Utility Classes ─────────────────────────────────────── */
.text-accent  { color: var(--clr-accent); }
.text-muted   { color: var(--clr-text-muted); }
.text-center  { text-align: center; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border-width: 0; }
.visually-hidden { @extend .sr-only; }

/* ── Responsive ──────────────────────────────────────────── */
@media (max-width: 1100px) {
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .article-layout { grid-template-columns: 1fr; }
  .toc { position: static; max-height: none; }
}

@media (max-width: 900px) {
  .main-layout { flex-direction: column; padding: var(--space-md); }
  .sidebar { width: 100%; position: static; max-height: none; display: none; }
  .sidebar.open { display: block; }

  .nav-links { display: none; }
  .nav-pwa-btn { display: none !important; }
  .nav-hamburger { display: flex; }
  .nav-search { max-width: 100%; }

  .categories-grid { grid-template-columns: repeat(2, 1fr); }
  .articles-grid { grid-template-columns: 1fr; }
  .stats-row { gap: var(--space-lg); }
}

@media (max-width: 600px) {
  .hero { padding: var(--space-2xl) var(--space-md); }
  .hero-title { font-size: 1.75rem; }
  .footer-inner { grid-template-columns: 1fr; }
  .article-nav-buttons { flex-direction: column; }
  .categories-grid { grid-template-columns: 1fr; }
}

/* ── PWA Install Banner ──────────────────────────────────── */
.pwa-banner {
  position: fixed;
  bottom: var(--space-lg);
  right: var(--space-lg);
  z-index: 50;
  padding: var(--space-md) var(--space-lg);
  background: var(--clr-bg-card);
  border: 1px solid var(--clr-accent);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-card), var(--shadow-glow);
  max-width: 320px;
  display: none;
  animation: slideUp 0.4s ease;
}

.pwa-banner.visible { display: block; }

@keyframes slideUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

.pwa-banner-title {
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--clr-text-primary);
  margin-bottom: 0.25rem;
}

.pwa-banner-desc {
  font-size: 0.8rem;
  color: var(--clr-text-muted);
  margin-bottom: var(--space-md);
}

.pwa-banner-actions {
  display: flex;
  gap: var(--space-sm);
}

.pwa-install-btn {
  flex: 1;
  padding: 0.5rem;
  background: linear-gradient(135deg, var(--clr-accent), #0099bb);
  color: var(--clr-text-inverse);
  border: none;
  border-radius: var(--border-radius-sm);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform var(--transition-fast);
}

.pwa-install-btn:hover { transform: translateY(-1px); }

.pwa-dismiss-btn {
  padding: 0.5rem 0.75rem;
  background: transparent;
  border: 1px solid var(--clr-border);
  border-radius: var(--border-radius-sm);
  color: var(--clr-text-muted);
  font-size: 0.8rem;
  cursor: pointer;
  transition: border-color var(--transition-fast);
}

.pwa-dismiss-btn:hover { border-color: var(--clr-border-hover); }

/* ── Info/Tip/Warning Boxes ──────────────────────────────── */
.callout {
  display: flex;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--border-radius);
  border-left: 3px solid;
  margin: var(--space-lg) 0;
}

.callout-info    { background: rgba(0,212,255,0.06);  border-color: var(--clr-neon-cyan);   }
.callout-tip     { background: rgba(0,255,136,0.06);  border-color: var(--clr-neon-green);  }
.callout-warning { background: rgba(255,122,0,0.08);  border-color: var(--clr-neon-orange); }
.callout-danger  { background: rgba(244,67,54,0.08);  border-color: #f44336; }

.callout-icon { font-size: 1.25rem; flex-shrink: 0; margin-top: 2px; }
.callout-content p { margin: 0; font-size: 0.9rem; }
.callout-content strong { display: block; margin-bottom: 0.25rem; }