/* ==========================================================================
   PROMPTSTAGING - MODERN DESIGN SYSTEM & FLUID MOTION ENGINE
   - Day / Night Mode (CSS Custom Properties & LocalStorage)
   - Scroll-Driven Animations & Reveal Observers
   - Silk & Spring Micro-Interactions (ui-motion & scroll-experience)
   - Search & Filter UI for Blog Portal
   - Accessible Contrast (AAA) & Responsive Layout
   ========================================================================== */

/* Default: Dark Mode */
:root {
  --bg-main: #0B0F19;
  --bg-card: #111827;
  --bg-card-hover: #1F2937;
  --bg-subtle: #1E293B;
  --border-color: #334155;
  --border-focus: #6366F1;

  --text-primary: #F8FAFC;
  --text-secondary: #94A3B8;
  --text-muted: #64748B;
  
  --primary: #6366F1;
  --primary-hover: #4F46E5;
  --primary-glow: rgba(99, 102, 241, 0.25);
  
  --accent-emerald: #10B981;
  --accent-cyan: #06B6D4;
  --accent-amber: #F59E0B;

  --ad-bg: #0F172A;
  --ad-border: #1E293B;
  --ad-text: #64748B;
  --code-bg: #090D16;

  /* Typography with instant system font fallbacks */
  --font-heading: 'Plus Jakarta Sans', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-body: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -2px rgba(0, 0, 0, 0.2);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 8px 10px -6px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 25px var(--primary-glow);

  /* Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  /* Transitions (Silk & Spring) */
  --transition-fast: 150ms cubic-bezier(0.16, 1, 0.3, 1);
  --transition-normal: 280ms cubic-bezier(0.16, 1, 0.3, 1);
  --transition-silk: 400ms cubic-bezier(0.25, 1, 0.5, 1);
}

/* Light Mode Overrides */
[data-theme="light"] {
  --bg-main: #F8FAFC;
  --bg-card: #FFFFFF;
  --bg-card-hover: #F1F5F9;
  --bg-subtle: #EDF2F7;
  --border-color: #E2E8F0;
  --border-focus: #4F46E5;

  --text-primary: #0F172A;
  --text-secondary: #475569;
  --text-muted: #64748B;
  
  --primary: #4F46E5;
  --primary-hover: #4338CA;
  --primary-glow: rgba(79, 70, 229, 0.15);
  
  --accent-emerald: #059669;
  --accent-cyan: #0891B2;
  --accent-amber: #D97706;

  --ad-bg: #F1F5F9;
  --ad-border: #CBD5E1;
  --ad-text: #64748B;
  --code-bg: #1E293B;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.04);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  background-color: var(--bg-main);
  color: var(--text-primary);
  font-family: var(--font-body);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color var(--transition-silk), color var(--transition-silk);
}

/* Accessible Focus Ring */
:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 3px;
}

/* Container */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* Typography Defaults */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--text-primary);
  line-height: 1.25;
  font-weight: 700;
  letter-spacing: -0.02em;
  transition: color var(--transition-silk);
}

h1 { font-size: clamp(2rem, 5vw, 3.25rem); }
h2 { font-size: clamp(1.5rem, 3.5vw, 2.25rem); }
h3 { font-size: clamp(1.2rem, 2.5vw, 1.5rem); }

p {
  color: var(--text-secondary);
  font-size: 1.05rem;
  transition: color var(--transition-silk);
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color var(--transition-fast), transform var(--transition-fast);
}

a:hover {
  color: var(--text-primary);
}

/* Header & Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: rgba(11, 15, 25, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 0;
  transition: background-color var(--transition-silk), border-color var(--transition-silk);
}

[data-theme="light"] .site-header {
  background-color: rgba(248, 250, 252, 0.85);
}

.nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-right: 2rem;
  flex-shrink: 0;
  transition: transform var(--transition-fast);
}

.logo:hover {
  transform: scale(1.02);
}

.logo-icon {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--primary), var(--accent-cyan));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: bold;
  animation: pulse-gentle 4s ease-in-out infinite;
}

/* Mobile Navigation & Header Controls */
.nav-actions-mobile {
  display: none;
  align-items: center;
  gap: 0.6rem;
}

.nav-mobile-toggle {
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  transition: all var(--transition-fast);
}

.nav-mobile-toggle:hover {
  border-color: var(--primary);
}

.nav-mobile-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--text-primary);
  border-radius: 2px;
  transition: all 0.22s ease-in-out;
}

.nav-mobile-toggle.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-mobile-toggle.open span:nth-child(2) {
  opacity: 0;
}

.nav-mobile-toggle.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.nav-links {
  display: flex;
  gap: 1.5rem;
  align-items: center;
  list-style: none;
}

.nav-links a {
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
  position: relative;
  padding: 0.25rem 0;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background: var(--primary);
  transition: width var(--transition-normal);
  border-radius: var(--radius-full);
}

.nav-links a:hover::after, .nav-links a.active::after {
  width: 100%;
}

.nav-links a:hover, .nav-links a.active {
  color: var(--text-primary);
}

/* Nav Dropdown Styling (Desktop & Responsive) */
.nav-dropdown {
  position: relative;
}

.nav-dropdown-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.25rem 0;
  cursor: pointer;
  transition: color var(--transition-fast);
}

.nav-dropdown-btn:hover,
.nav-dropdown:hover .nav-dropdown-btn,
.nav-dropdown.active .nav-dropdown-btn {
  color: var(--text-primary);
}

.dropdown-chevron {
  font-size: 0.75rem;
  transition: transform var(--transition-fast);
}

.nav-dropdown:hover .dropdown-chevron,
.nav-dropdown.open .dropdown-chevron {
  transform: rotate(180deg);
}

.nav-dropdown-menu {
  display: none;
  position: absolute;
  top: calc(100% + 0.65rem);
  left: 50%;
  transform: translateX(-50%);
  min-width: 250px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.5rem;
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.45);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  z-index: 1000;
  list-style: none;
}

.nav-dropdown:hover .nav-dropdown-menu,
.nav-dropdown.open .nav-dropdown-menu {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  animation: fadeInDown 0.18s ease-out;
}

.nav-dropdown-menu li {
  width: 100%;
}

.nav-dropdown-menu li a {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.55rem 0.75rem;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  transition: all var(--transition-fast);
}

.nav-dropdown-menu li a:hover {
  background: var(--bg-subtle);
  color: var(--text-primary);
}

.nav-dropdown-menu li a::after {
  display: none;
}

.nav-dropdown-menu .dropdown-icon {
  font-size: 1.15rem;
  flex-shrink: 0;
}

.nav-dropdown-menu strong {
  display: block;
  font-size: 0.88rem;
  color: var(--text-primary);
}

.nav-dropdown-menu small {
  display: block;
  font-size: 0.75rem;
  color: var(--text-muted);
}

@media (max-width: 1040px) {
  .site-header {
    padding: 0.75rem 0;
  }

  .nav-wrapper {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
  }

  /* Prevent <nav> container from creating an empty flex box that displaces action buttons */
  .site-header nav {
    display: contents;
  }

  .nav-actions-mobile {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-left: auto;
    flex-shrink: 0;
    z-index: 60;
  }

  .mobile-theme-btn {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-subtle);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    cursor: pointer;
    font-size: 1.15rem;
    flex-shrink: 0;
    transition: all var(--transition-fast);
  }

  .mobile-theme-btn:hover {
    border-color: var(--primary);
  }

  .site-header .theme-toggle-btn:not(.mobile-theme-btn) {
    display: none;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: calc(100% + 0.5rem);
    left: 0.75rem;
    right: 0.75rem;
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    flex-direction: column;
    padding: 1.25rem;
    gap: 0.5rem;
    align-items: stretch;
    box-shadow: 0 16px 36px rgba(0, 0, 0, 0.45);
    z-index: 1000;
  }

  .nav-links.open {
    display: flex;
    animation: fadeInDown 0.22s ease-out;
  }

  .nav-links li {
    width: 100%;
  }

  .nav-links a {
    display: block;
    padding: 0.65rem 0.75rem;
    font-size: 1rem;
    border-radius: var(--radius-sm);
    transition: background var(--transition-fast);
  }

  .nav-links a:hover, .nav-links a.active {
    background: var(--bg-subtle);
  }

  .nav-links a::after {
    display: none;
  }

  .nav-dropdown {
    width: 100%;
  }

  .nav-dropdown-btn {
    width: 100%;
    justify-content: space-between;
    padding: 0.65rem 0.75rem;
    font-size: 1rem;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
  }

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

  .nav-dropdown-menu {
    position: static;
    transform: none;
    min-width: 100%;
    box-shadow: none;
    border: none;
    border-left: 2px solid var(--border-color);
    border-radius: 0;
    margin: 0.25rem 0 0.5rem 0.75rem;
    padding: 0.25rem 0 0.25rem 0.75rem;
    background: transparent;
  }

  .nav-dropdown:hover .nav-dropdown-menu {
    display: none;
  }

  .nav-dropdown.open .nav-dropdown-menu {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
  }

  .nav-dropdown-menu li a {
    padding: 0.45rem 0.6rem;
    font-size: 0.92rem;
  }

  .btn-install-app {
    width: 100%;
    justify-content: center;
    padding: 0.6rem 1rem;
  }
}

@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.badge-pro {
  background: rgba(99, 102, 241, 0.15);
  color: var(--primary);
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  border: 1px solid rgba(99, 102, 241, 0.3);
}

/* Theme Toggle Button */
.theme-toggle-btn {
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1.1rem;
  transition: transform var(--transition-fast), background-color var(--transition-fast), border-color var(--transition-fast);
}

.theme-toggle-btn:hover {
  transform: rotate(20deg) scale(1.08);
  border-color: var(--primary);
}

.theme-toggle-btn:active {
  transform: scale(0.95);
}

/* Ad Placement Slots (Optimized for Core Web Vitals) */
.ad-slot {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--ad-bg);
  border: 1px dashed var(--ad-border);
  border-radius: var(--radius-md);
  margin: 1.75rem auto;
  position: relative;
  overflow: hidden;
  text-align: center;
  transition: background-color var(--transition-silk), border-color var(--transition-silk);
}

.ad-label {
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ad-text);
  margin-bottom: 0.5rem;
  font-weight: 600;
}

.ad-leaderboard {
  min-height: 90px;
  width: 100%;
  max-width: 728px;
  padding: 0.75rem;
}

.ad-native {
  width: 100%;
  min-height: 120px;
  padding: 1.25rem;
  background: linear-gradient(180deg, var(--bg-subtle) 0%, var(--bg-card) 100%);
  border: 1px solid var(--border-color);
}

.ad-sidebar {
  min-height: 250px;
  width: 100%;
  padding: 1rem;
}

.ad-preview-box {
  color: var(--text-muted);
  font-size: 0.85rem;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  align-items: center;
}

/* Hero Section */
.hero-section {
  padding: 4rem 0 3rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

/* Hero Canvas for Interactive Particles */
.hero-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
}

/* Ambient Background Glow */
.hero-ambient-glow {
  position: absolute;
  top: -10%;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 350px;
  background: radial-gradient(circle, var(--primary-glow) 0%, rgba(99, 102, 241, 0) 70%);
  filter: blur(80px);
  pointer-events: none;
  z-index: 0;
  animation: float-glow 8s ease-in-out infinite alternate;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.9rem;
  background: rgba(99, 102, 241, 0.1);
  border: 1px solid rgba(99, 102, 241, 0.25);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  color: var(--primary);
  margin-bottom: 1.5rem;
  position: relative;
  z-index: 1;
}

.hero-title {
  max-width: 960px;
  margin: 0 auto 1.5rem;
  position: relative;
  z-index: 1;
  text-align: center;
  line-height: 1.25;
}

.hero-title-static {
  display: block;
  color: var(--text-primary);
  -webkit-text-fill-color: var(--text-primary);
  font-weight: 700;
}

.hero-title-dynamic {
  display: block;
  min-height: 1.3em;
  line-height: 1.3;
  margin: 0.2rem 0;
  white-space: nowrap;
}

.hero-title-sub {
  display: block;
  color: var(--text-primary);
  -webkit-text-fill-color: var(--text-primary);
  font-weight: 700;
}

/* Dynamic Typing Animation */
.typing-container {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  position: relative;
  white-space: nowrap;
  min-height: 1.25em;
  min-width: 19ch;
  vertical-align: middle;
}

.typing-text {
  background: linear-gradient(135deg, #A5B4FC 0%, var(--primary) 50%, var(--accent-cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
  min-height: 1.2em;
  line-height: 1.25;
}

[data-theme="light"] .typing-text {
  background: linear-gradient(135deg, var(--primary) 0%, #312E81 50%, var(--accent-cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.typing-cursor {
  display: inline-block;
  margin-left: 4px;
  color: var(--accent-cyan);
  font-weight: 300;
  -webkit-text-fill-color: var(--accent-cyan);
  animation: typingCursorBlink 0.85s infinite ease-in-out;
  user-select: none;
  line-height: 1;
}

@keyframes typingCursorBlink {
  0%, 100% {
    opacity: 1;
    transform: scaleY(1);
  }
  50% {
    opacity: 0;
    transform: scaleY(0.75);
  }
}

@media (max-width: 640px) {
  .hero-title {
    font-size: clamp(1.45rem, 5.2vw, 1.95rem);
  }
}

.hero-subtitle {
  max-width: 650px;
  margin: 0 auto 2.25rem;
  font-size: 1.15rem;
  position: relative;
  z-index: 1;
}

/* Interactive Tool Card */
.tool-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  box-shadow: var(--shadow-xl);
  margin: 2rem auto;
  max-width: 850px;
  position: relative;
  z-index: 1;
  transition: background-color var(--transition-silk), border-color var(--transition-silk), box-shadow var(--transition-silk);
}

.tool-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 1rem;
}

.tool-controls {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  margin-bottom: 1.5rem;
}

@media (max-width: 640px) {
  .tool-controls {
    grid-template-columns: 1fr;
  }
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  text-align: left;
}

.form-group label {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-primary);
}

.select-input, .text-input {
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-family: var(--font-body);
  transition: border-color var(--transition-fast), background-color var(--transition-silk);
  width: 100%;
}

.select-input:focus, .text-input:focus {
  border-color: var(--primary);
  outline: none;
}

/* Model Switcher Tabs */
.model-select-group {
  margin-bottom: 1.5rem;
  text-align: left;
}

.control-label {
  display: block;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.6rem;
}

.model-pills {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.model-pill {
  flex: 1;
  min-width: 140px;
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.65rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  transition: all var(--transition-fast);
}

.model-pill:hover {
  background: var(--bg-card);
  color: var(--text-primary);
  border-color: var(--border-hover);
}

.model-pill.active {
  background: rgba(99, 102, 241, 0.12);
  border-color: var(--primary);
  color: var(--text-primary);
  box-shadow: 0 0 0 1px var(--primary);
}

.model-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  display: inline-block;
}

.dot-chatgpt { background: #10A37F; }
.dot-claude { background: #D97706; }
.dot-gemini { background: #3B82F6; }

/* Interactive Variables Customizer */
.variables-section {
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  margin-bottom: 1.5rem;
  text-align: left;
  animation: fadeIn 0.3s ease;
}

.variables-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.variables-title {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.variables-actions {
  display: flex;
  gap: 0.5rem;
}

.btn-sm-action {
  background: rgba(99, 102, 241, 0.15);
  color: var(--primary);
  border: 1px solid rgba(99, 102, 241, 0.3);
  padding: 0.3rem 0.65rem;
  border-radius: var(--radius-sm);
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-sm-action:hover {
  background: var(--primary);
  color: #fff;
}

.btn-sm-ghost {
  background: transparent;
  color: var(--text-muted);
  border-color: var(--border-color);
}

.btn-sm-ghost:hover {
  background: var(--border-color);
  color: var(--text-primary);
}

.variables-grid {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.variable-field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.variable-label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
  display: flex;
  justify-content: space-between;
}

.variable-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--primary);
  background: rgba(99, 102, 241, 0.1);
  padding: 0.1rem 0.35rem;
  border-radius: 4px;
}

.variable-input {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.65rem 0.85rem;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-family: var(--font-body);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  width: 100%;
}

.variable-input:focus {
  border-color: var(--primary);
  outline: none;
  box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.2);
}

.variable-textarea {
  min-height: 65px;
  resize: vertical;
}

/* Badge Reliability & Anti-Hallucination Audit Box */
.badge-reliability {
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent-emerald);
  border: 1px solid rgba(16, 185, 129, 0.3);
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-full);
  font-size: 0.72rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  transition: all var(--transition-fast);
}

.badge-clickable {
  cursor: pointer;
}

.badge-clickable:hover {
  background: rgba(16, 185, 129, 0.25);
  border-color: var(--accent-emerald);
  transform: translateY(-1px);
}

.badge-clickable.active {
  background: var(--accent-emerald);
  color: #000;
}

.badge-info-icon {
  font-size: 0.68rem;
  opacity: 0.85;
}

.audit-report-box {
  background: var(--bg-card);
  border: 1px solid rgba(16, 185, 129, 0.3);
  border-radius: var(--radius-sm);
  padding: 1rem 1.15rem;
  margin: 0.85rem 0 1rem;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.1);
  text-align: left;
}

.audit-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.4rem;
}

.audit-title {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.88rem;
  color: var(--accent-emerald);
}

.audit-score {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent-emerald);
  background: rgba(16, 185, 129, 0.12);
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-full);
  font-weight: 700;
}

.audit-summary {
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.45;
  margin-bottom: 0.85rem;
}

.audit-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.65rem;
}

@media (max-width: 640px) {
  .audit-grid {
    grid-template-columns: 1fr;
  }
}

.audit-card {
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 0.6rem 0.75rem;
}

.audit-card-status {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.2rem;
}

.audit-card-desc {
  font-size: 0.73rem;
  color: var(--text-muted);
  line-height: 1.4;
}

/* 1-Click Launch Bar */
.launch-bar {
  margin-top: 1rem;
  padding-top: 0.85rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.launch-label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-muted);
}

.launch-buttons {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.btn-launch {
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.45rem 0.8rem;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-launch:hover {
  transform: translateY(-1px);
  border-color: var(--border-hover);
}

.btn-launch-chatgpt:hover {
  background: rgba(16, 163, 127, 0.15);
  border-color: #10A37F;
  color: #10A37F;
}

.btn-launch-claude:hover {
  background: rgba(217, 119, 6, 0.15);
  border-color: #D97706;
  color: #D97706;
}

.btn-launch-gemini:hover {
  background: rgba(59, 130, 246, 0.15);
  border-color: #3B82F6;
  color: #3B82F6;
}

@media (max-width: 640px) {
  .launch-bar {
    flex-direction: column;
    align-items: stretch;
    gap: 0.85rem;
  }
  .launch-buttons {
    flex-direction: column;
  }
  .btn-launch {
    width: 100%;
    justify-content: center;
    padding: 0.65rem 1rem;
    font-size: 0.85rem;
  }
  .output-header {
    flex-direction: column;
    align-items: stretch;
    gap: 0.75rem;
  }
  .output-actions {
    width: 100%;
  }
  .output-actions .btn-copy {
    flex: 1;
    text-align: center;
    justify-content: center;
  }
  .variables-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.6rem;
  }
  .variables-actions {
    width: 100%;
    justify-content: flex-start;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 1rem;
  }
  .site-header .logo {
    font-size: 1.18rem;
    gap: 0.45rem;
  }
  .site-header .logo-icon {
    width: 28px;
    height: 28px;
    font-size: 0.95rem;
  }
  .nav-actions-mobile {
    gap: 0.4rem;
  }
  .model-pill {
    min-width: 100%;
  }
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background: var(--primary);
  color: #FFFFFF;
  padding: 0.85rem 1.75rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 1rem;
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  width: 100%;
}

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

.btn-primary:active {
  transform: scale(0.98);
}

/* Prompt Output Box */
.output-box {
  background: var(--code-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  margin-top: 1.5rem;
  text-align: left;
  position: relative;
  transition: border-color var(--transition-fast);
}

.output-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-color);
}

.output-title {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-transform: uppercase;
  color: var(--accent-emerald);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.btn-copy {
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.4rem 0.8rem;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: all var(--transition-fast);
}

.btn-copy:hover {
  background: var(--border-color);
  transform: translateY(-1px);
}

.btn-copy:active {
  transform: scale(0.96);
}

.btn-copy.copied {
  background: var(--accent-emerald);
  color: #000;
  border-color: var(--accent-emerald);
}

.output-content {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: #E2E8F0;
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-word;
  max-height: 500px;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 1rem;
  background: rgba(0, 0, 0, 0.25);
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255, 255, 255, 0.05);
  margin-bottom: 1.25rem;
  overscroll-behavior: contain;
}

[data-theme="light"] .output-content {
  color: #F8FAFC;
}

.output-content::-webkit-scrollbar {
  width: 6px;
}

.output-content::-webkit-scrollbar-track {
  background: rgba(0, 0, 0, 0.15);
  border-radius: 999px;
}

.output-content::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 999px;
}

.output-content::-webkit-scrollbar-thumb:hover {
  background: var(--primary);
}

/* Meta Stats Bar */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin: 3.5rem 0;
}

@media (max-width: 768px) {
  .metrics-grid {
    grid-template-columns: 1fr;
  }
}

.metric-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  text-align: center;
  transition: transform var(--transition-normal), border-color var(--transition-normal);
}

.metric-card:hover {
  transform: translateY(-3px);
  border-color: var(--primary);
}

.metric-value {
  font-family: var(--font-heading);
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.metric-label {
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* Articles Grid Section */
.section-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 2rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-color);
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
  margin-bottom: 4rem;
}

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

@media (max-width: 640px) {
  .articles-grid {
    grid-template-columns: 1fr;
  }
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.article-card:hover {
  transform: translateY(-5px);
  border-color: var(--primary);
  box-shadow: var(--shadow-xl);
}

.article-cover {
  height: 180px;
  background-size: cover;
  background-position: center;
  position: relative;
  display: flex;
  align-items: flex-end;
  padding: 1rem;
}

.article-tag {
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(4px);
  color: #F8FAFC;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
}

.article-body {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.article-title {
  font-size: 1.25rem;
  margin-bottom: 0.75rem;
  line-height: 1.35;
}

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

.article-title a:hover {
  color: var(--primary);
}

.article-excerpt {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
  flex-grow: 1;
}

.article-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border-color);
  padding-top: 0.85rem;
}

/* Dedicated Blog Hub Search & Filter Bar */
.blog-search-bar-wrapper {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin: 2rem 0 3rem;
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.search-input-container {
  position: relative;
  width: 100%;
}

.search-input-icon {
  position: absolute;
  left: 1.1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 1.1rem;
}

.blog-search-input {
  width: 100%;
  padding: 0.9rem 1rem 0.9rem 2.8rem;
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 1rem;
  font-family: var(--font-body);
  transition: border-color var(--transition-fast), background-color var(--transition-silk);
}

.blog-search-input:focus {
  border-color: var(--primary);
  outline: none;
}

.category-filter-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.filter-pill {
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.45rem 1rem;
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filter-pill:hover {
  background: var(--border-color);
  color: var(--text-primary);
}

.filter-pill.active {
  background: var(--primary);
  color: #FFFFFF;
  border-color: var(--primary);
}

/* Editorial & Article Detail Layout (SEO/AEO Engineered) */
.editorial-layout {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 3rem;
  margin: 3rem auto;
}

@media (max-width: 900px) {
  .editorial-layout {
    grid-template-columns: 1fr;
  }
}

.reading-progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--accent-cyan));
  width: 0%;
  z-index: 100;
  transition: width 50ms ease-out;
}

/* TL;DR AEO Direct-Answer Block */
.tldr-box {
  background: rgba(99, 102, 241, 0.08);
  border-left: 4px solid var(--primary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 1.5rem;
  margin: 2rem 0;
}

.tldr-title {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--primary);
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.tldr-box p {
  color: var(--text-primary);
  font-weight: 500;
  font-size: 1.1rem;
}

/* Content Typography */
.prose {
  color: var(--text-secondary);
  font-size: 1.1rem;
  line-height: 1.8;
}

.prose h2 {
  margin: 2.5rem 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-color);
}

.prose h3 {
  margin: 2rem 0 0.8rem;
}

.prose p {
  margin-bottom: 1.5rem;
}

.prose ul, .prose ol {
  margin: 1.25rem 0 1.5rem 1.5rem;
}

.prose li {
  margin-bottom: 0.6rem;
}

/* Comparison Tables & Responsive Touch Scrolling */
.comparison-table-wrapper {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin: 2rem 0;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  max-width: 100%;
  position: relative;
  scrollbar-width: thin;
  scrollbar-color: var(--border-hover) transparent;
}

.comparison-table-wrapper::-webkit-scrollbar {
  height: 6px;
}

.comparison-table-wrapper::-webkit-scrollbar-thumb {
  background: var(--border-hover);
  border-radius: 4px;
}

.comparison-table {
  width: 100%;
  min-width: 680px;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.92rem;
}

.comparison-table th {
  background: var(--bg-card);
  color: var(--text-primary);
  padding: 0.9rem 1.15rem;
  font-weight: 600;
  border-bottom: 1px solid var(--border-color);
  white-space: nowrap;
}

.comparison-table td {
  padding: 0.85rem 1.15rem;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-secondary);
  line-height: 1.5;
}

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

@media (max-width: 768px) {
  .comparison-table {
    min-width: 620px;
    font-size: 0.86rem;
  }
  .comparison-table th, .comparison-table td {
    padding: 0.75rem 0.9rem;
  }
}

/* FAQ Accordion (AEO optimized) */
.faq-section {
  margin: 3.5rem 0;
}

.faq-item {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  margin-bottom: 0.85rem;
  background: var(--bg-card);
  overflow: hidden;
  transition: border-color var(--transition-fast), background-color var(--transition-silk);
}

.faq-question {
  width: 100%;
  text-align: left;
  background: transparent;
  border: none;
  padding: 1.1rem 1.5rem;
  color: var(--text-primary);
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 600;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
}

.faq-answer {
  padding: 0 1.5rem 1.25rem;
  display: none;
  color: var(--text-secondary);
  line-height: 1.6;
}

.faq-item.open .faq-answer {
  display: block;
}

.faq-item.open .faq-icon {
  transform: rotate(180deg);
}

.faq-icon {
  transition: transform var(--transition-fast);
}

/* ==========================================================================
   HOMEPAGE EXPANDED ARCHITECTURE: FRAMEWORK & GLOSSARY
   ========================================================================== */

.framework-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  margin: 2rem 0 3.5rem;
}

@media (max-width: 768px) {
  .framework-grid {
    grid-template-columns: 1fr;
  }
}

.framework-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  transition: transform var(--transition-normal), border-color var(--transition-normal);
  position: relative;
  overflow: hidden;
}

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

.framework-number {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--primary);
  background: rgba(99, 102, 241, 0.12);
  border: 1px solid rgba(99, 102, 241, 0.3);
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
  display: inline-block;
  margin-bottom: 0.85rem;
}

.framework-card h3 {
  font-size: 1.15rem;
  margin-bottom: 0.6rem;
}

.framework-card p {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 0;
}

/* Glossary Section */
.glossary-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
  margin: 2rem 0 3.5rem;
}

@media (max-width: 768px) {
  .glossary-grid {
    grid-template-columns: 1fr;
  }
}

.glossary-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.4rem;
  transition: border-color var(--transition-fast);
}

.glossary-card:hover {
  border-color: var(--primary);
}

.glossary-term {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.4rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.glossary-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent-cyan);
  background: rgba(6, 182, 212, 0.1);
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
}

.glossary-def {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.55;
  margin: 0;
}

/* Footer */
.site-footer {
  background: #080C14;
  border-top: 1px solid var(--border-color);
  padding: 4rem 0 2rem;
  margin-top: auto;
  transition: background-color var(--transition-silk), border-color var(--transition-silk);
}

[data-theme="light"] .site-footer {
  background: #0F172A;
  color: #F8FAFC;
}

[data-theme="light"] .site-footer p,
[data-theme="light"] .site-footer .footer-links a,
[data-theme="light"] .site-footer .footer-bottom span {
  color: #94A3B8;
}

[data-theme="light"] .site-footer .footer-col h4,
[data-theme="light"] .site-footer .logo {
  color: #F8FAFC;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

@media (max-width: 768px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

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

.footer-col h4 {
  font-size: 0.95rem;
  margin-bottom: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-primary);
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.footer-links a {
  color: var(--text-muted);
  font-size: 0.9rem;
}

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

.footer-bottom {
  border-top: 1px solid var(--border-color);
  padding-top: 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Floating Back to Top Button */
.back-to-top-btn {
  position: fixed;
  bottom: 2rem;
  left: 2rem;
  width: 45px;
  height: 45px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  cursor: pointer;
  box-shadow: var(--shadow-xl);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--transition-normal);
  z-index: 90;
}

.back-to-top-btn.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top-btn:hover {
  background: var(--primary);
  color: #FFFFFF;
  border-color: var(--primary);
  transform: translateY(-3px);
}

/* Toast notification */
.toast {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--accent-emerald);
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-xl);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 500;
  transform: translateY(100px);
  opacity: 0;
  transition: all var(--transition-normal);
  z-index: 100;
}

.toast.visible {
  transform: translateY(0);
  opacity: 1;
}

/* ==========================================================================
   SCROLL-DRIVEN & FLUID MOTION ANIMATIONS
   (scroll-experience & ui-motion inspired)
   ========================================================================== */

/* Scroll Reveal Classes */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.65s cubic-bezier(0.16, 1, 0.3, 1), transform 0.65s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}

.reveal.is-revealed {
  opacity: 1;
  transform: translateY(0);
}

/* Critical Above-the-fold Elements: Never hide with opacity 0 to optimize Core Web Vitals (FCP/LCP) */
.hero-section .reveal,
.hero-section .reveal-scale,
.hero-title,
.hero-subtitle,
.hero-pill,
.site-header {
  opacity: 1 !important;
  transform: none !important;
  transition: none !important;
}

/* Stagger item delays */
.stagger-1 { transition-delay: 0.08s; }
.stagger-2 { transition-delay: 0.16s; }
.stagger-3 { transition-delay: 0.24s; }
.stagger-4 { transition-delay: 0.32s; }

/* Scale Reveal */
.reveal-scale {
  opacity: 0;
  transform: scale(0.94);
  transition: opacity 0.5s cubic-bezier(0.16, 1, 0.3, 1), transform 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal-scale.is-revealed {
  opacity: 1;
  transform: scale(1);
}

/* Keyframes */
@keyframes pulse-gentle {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

@keyframes float-glow {
  0% { transform: translate(-50%, 0) scale(1); opacity: 0.8; }
  100% { transform: translate(-50%, 25px) scale(1.15); opacity: 0.5; }
}

/* Native CSS Scroll-Driven Animation progressive enhancement */
@supports (animation-timeline: view()) {
  .article-card {
    animation: fade-in-scroll linear both;
    animation-timeline: view();
    animation-range: entry 10% cover 25%;
  }

  @keyframes fade-in-scroll {
    from {
      opacity: 0;
      transform: translateY(25px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }
}


/* ==========================================================================
   INFOGRAPHIC & VISUAL ASSET STYLING (SEO & Image Search Optimized)
   ========================================================================== */

.infographic-wrapper {
  margin: 2.5rem 0;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
  transition: transform var(--transition-normal), border-color var(--transition-normal);
}

.infographic-wrapper:hover {
  border-color: var(--primary);
  transform: translateY(-2px);
}

.infographic-header {
  padding: 0.9rem 1.25rem;
  background: var(--bg-subtle);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.infographic-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  color: var(--accent-cyan);
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.infographic-img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  transition: transform var(--transition-silk);
}

.infographic-caption {
  padding: 0.85rem 1.25rem;
  font-size: 0.88rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border-color);
  background: var(--bg-card);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.infographic-actions {
  display: flex;
  gap: 0.5rem;
}

.btn-icon-action {
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.3rem 0.6rem;
  border-radius: var(--radius-sm);
  font-size: 0.78rem;
  font-weight: 500;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  transition: all var(--transition-fast);
}

.btn-icon-action:hover {
  color: var(--text-primary);
  border-color: var(--primary);
}

.btn-icon-action:active {
  transform: scale(0.96);
}

/* Zoom cursor affordance for expandable graphics */
.infographic-img,
.article-hero-img {
  cursor: zoom-in;
}

/* ==========================================================================
   IMAGE LIGHTBOX / SAME-TAB FULL-SIZE MODAL (With Close Button)
   ========================================================================== */

.lightbox-modal {
  position: fixed;
  inset: 0;
  z-index: 99999;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: rgba(4, 7, 16, 0.94);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.25s cubic-bezier(0.16, 1, 0.3, 1), visibility 0.25s ease;
  padding: 1.25rem;
  box-sizing: border-box;
  cursor: zoom-out;
}

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

.lightbox-dialog {
  position: relative;
  max-width: 95vw;
  max-height: 92vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  cursor: default;
  transform: scale(0.94) translateY(8px);
  transition: transform 0.28s cubic-bezier(0.16, 1, 0.3, 1);
  width: auto;
}

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

/* Lightbox Top Header Bar */
.lightbox-header {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 0.85rem;
  gap: 1rem;
}

.lightbox-title-box {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  max-width: calc(100% - 140px);
}

.lightbox-title {
  font-size: 0.98rem;
  font-weight: 600;
  color: #F8FAFC;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.lightbox-subtitle {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.lightbox-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}

.lightbox-action-btn {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.16);
  color: #E2E8F0;
  padding: 0.45rem 0.85rem;
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  font-weight: 500;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  text-decoration: none;
  transition: all var(--transition-fast);
}

.lightbox-action-btn:hover {
  background: rgba(255, 255, 255, 0.16);
  border-color: var(--primary);
  color: #FFFFFF;
  transform: translateY(-1px);
}

/* Close Button */
.lightbox-close-btn {
  background: rgba(239, 68, 68, 0.9);
  color: #FFFFFF;
  border: 1px solid rgba(255, 255, 255, 0.25);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  font-size: 1.25rem;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  box-shadow: 0 4px 16px rgba(239, 68, 68, 0.4);
}

.lightbox-close-btn:hover {
  background: #dc2626;
  transform: scale(1.08);
  box-shadow: 0 6px 20px rgba(239, 68, 68, 0.6);
}

.lightbox-close-btn:active {
  transform: scale(0.92);
}

/* Main Image Wrapper */
.lightbox-image-wrapper {
  position: relative;
  max-width: 100%;
  max-height: calc(88vh - 70px);
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(11, 15, 25, 0.7);
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.12);
  box-shadow: 0 25px 60px -15px rgba(0, 0, 0, 0.9);
  overflow: hidden;
}

.lightbox-image {
  max-width: 92vw;
  max-height: calc(86vh - 70px);
  width: auto;
  height: auto;
  object-fit: contain;
  display: block;
  user-select: none;
}

/* Bottom Hint */
.lightbox-footer-hint {
  margin-top: 0.6rem;
  font-size: 0.78rem;
  color: rgba(255, 255, 255, 0.5);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.lightbox-kbd {
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: 4px;
  padding: 0.1rem 0.4rem;
  font-size: 0.72rem;
  font-family: var(--font-mono);
  color: #CBD5E1;
}



/* Article Top Hero Banner Image */
.article-hero-banner {
  width: 100%;
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin: 1.5rem 0 2.25rem;
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--border-color);
  transition: transform var(--transition-normal), border-color var(--transition-normal);
}

.article-hero-banner:hover {
  border-color: var(--primary);
  transform: translateY(-2px);
}

.article-hero-img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  max-height: 420px;
}

/* ==========================================================================
   INTERACTIVE AI LABOR SAVINGS ROI CALCULATOR WIDGET
   ========================================================================== */
.calculator-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  box-shadow: var(--shadow-xl);
  transition: border-color var(--transition-silk), background-color var(--transition-silk);
}

.calculator-header {
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 1.25rem;
  text-align: left;
}

.calculator-body {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 2.5rem;
  align-items: start;
}

@media (max-width: 900px) {
  .calculator-body {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}

.calculator-controls {
  display: flex;
  flex-direction: column;
  gap: 1.65rem;
  text-align: left;
}

.calc-control-group {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.calc-control-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.calc-control-header label {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-primary);
}

.calc-val-bubble {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--primary);
  background: rgba(99, 102, 241, 0.12);
  border: 1px solid rgba(99, 102, 241, 0.25);
  padding: 0.2rem 0.65rem;
  border-radius: var(--radius-full);
}

/* Custom Range Slider */
.calc-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 8px;
  border-radius: var(--radius-full);
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  outline: none;
  cursor: pointer;
  transition: background var(--transition-fast);
}

.calc-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--primary);
  border: 2px solid #FFFFFF;
  box-shadow: 0 0 12px rgba(99, 102, 241, 0.5);
  cursor: pointer;
  transition: transform var(--transition-fast), background-color var(--transition-fast);
}

.calc-slider::-webkit-slider-thumb:hover {
  transform: scale(1.15);
  background: var(--primary-hover);
}

.calc-slider::-moz-range-thumb {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--primary);
  border: 2px solid #FFFFFF;
  box-shadow: 0 0 12px rgba(99, 102, 241, 0.5);
  cursor: pointer;
  transition: transform var(--transition-fast);
}

.calc-slider-scale {
  display: flex;
  justify-content: space-between;
  font-size: 0.72rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  padding: 0 2px;
}

/* Efficiency Preset Pills */
.calc-efficiency-pills {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.efficiency-pill {
  flex: 1;
  min-width: 120px;
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.55rem 0.8rem;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-align: center;
}

.efficiency-pill:hover {
  background: var(--bg-card);
  color: var(--text-primary);
  border-color: var(--border-hover);
}

.efficiency-pill.active {
  background: rgba(99, 102, 241, 0.15);
  border-color: var(--primary);
  color: var(--primary);
  box-shadow: 0 0 0 1px var(--primary);
}

/* Calculator Results Card */
.calculator-results {
  background: linear-gradient(145deg, rgba(99, 102, 241, 0.08) 0%, rgba(6, 182, 212, 0.05) 100%);
  border: 1px solid rgba(99, 102, 241, 0.3);
  border-radius: var(--radius-md);
  padding: 1.85rem;
  text-align: left;
  position: relative;
  overflow: hidden;
}

.results-badge {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  color: var(--primary);
  letter-spacing: 0.05em;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.results-primary {
  margin-bottom: 1.5rem;
}

.results-cost {
  font-size: 2.85rem;
  font-weight: 800;
  color: var(--accent-emerald);
  font-family: var(--font-heading);
  letter-spacing: -0.02em;
  line-height: 1.1;
  transition: all 0.2s ease;
}

[data-theme="light"] .results-cost {
  color: #059669;
}

.results-subtext {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-top: 0.35rem;
}

/* Mini Stats Grid */
.results-stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.85rem;
  margin-bottom: 1.5rem;
}

@media (max-width: 480px) {
  .results-stats-grid {
    grid-template-columns: 1fr;
  }
}

.stat-mini-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.75rem 0.85rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.stat-mini-icon {
  font-size: 1.25rem;
}

.stat-mini-val {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.2;
}

.stat-mini-label {
  font-size: 0.72rem;
  color: var(--text-muted);
}

/* Visual Efficiency Track */
.efficiency-bar-wrapper {
  margin-bottom: 1.5rem;
}

.efficiency-bar-labels {
  display: flex;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--text-muted);
  font-weight: 500;
  margin-bottom: 0.4rem;
}

.efficiency-progress-track {
  width: 100%;
  height: 10px;
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.efficiency-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary) 0%, var(--accent-cyan) 100%);
  border-radius: var(--radius-full);
  transition: width 0.3s ease;
}

.calc-cta-wrapper .btn-primary {
  width: 100%;
  text-decoration: none;
}

/* ==========================================================================
   PERSONAL SAVED PROMPTS DRAWER & FAVORITES
   ========================================================================== */
.btn-favorite {
  border-color: rgba(245, 158, 11, 0.4);
  color: #F59E0B;
}

.btn-favorite:hover {
  background: rgba(245, 158, 11, 0.15);
  border-color: #F59E0B;
}

.btn-favorite.active {
  background: #F59E0B;
  color: #000;
  border-color: #F59E0B;
}

.saved-prompts-section {
  margin-top: 1.5rem;
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  text-align: left;
}

.saved-prompts-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.saved-prompts-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.92rem;
  color: var(--text-primary);
}

.badge-count {
  background: var(--primary);
  color: white;
  border-radius: var(--radius-full);
  padding: 0.1rem 0.55rem;
  font-size: 0.72rem;
  font-weight: 700;
  font-family: var(--font-mono);
}

.saved-prompts-list {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.saved-prompt-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.85rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  transition: border-color var(--transition-fast);
}

.saved-prompt-card:hover {
  border-color: var(--border-hover);
}

.saved-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.saved-card-title {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text-primary);
}

.saved-card-meta {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.saved-card-preview {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-secondary);
  background: var(--bg-subtle);
  padding: 0.45rem 0.65rem;
  border-radius: 4px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.saved-card-actions {
  display: flex;
  gap: 0.5rem;
  justify-content: flex-end;
}

/* ==========================================================================
   PROGRESSIVE WEB APP (PWA) INSTALL UI
   ========================================================================== */
.btn-install-app {
  background: rgba(99, 102, 241, 0.12);
  border: 1px solid rgba(99, 102, 241, 0.35);
  color: var(--text-primary);
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  transition: all var(--transition-fast);
}

.btn-install-app:hover {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
  transform: translateY(-1px);
}

.pwa-floating-banner {
  position: fixed;
  bottom: 1.5rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 999;
  background: var(--bg-card);
  border: 1px solid var(--primary);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
  border-radius: var(--radius-md);
  padding: 0.75rem 1rem;
  display: flex;
  align-items: center;
  gap: 1.25rem;
  max-width: 90vw;
  width: 440px;
  animation: slideUp 0.3s ease-out;
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translate(-50%, 20px);
  }
  to {
    opacity: 1;
    transform: translate(-50%, 0);
  }
}

.pwa-banner-content {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex: 1;
}

.pwa-banner-icon {
  font-size: 1.35rem;
  background: rgba(99, 102, 241, 0.15);
  padding: 0.25rem 0.45rem;
  border-radius: var(--radius-sm);
}

.pwa-banner-text {
  display: flex;
  flex-direction: column;
}

.pwa-banner-text strong {
  font-size: 0.88rem;
  color: var(--text-primary);
}

.pwa-banner-text span {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.pwa-banner-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-pwa-install {
  background: var(--primary);
  color: white;
  border: none;
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition-fast);
}

.btn-pwa-install:hover {
  background: var(--primary-hover);
}

.btn-pwa-dismiss {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.25rem 0.4rem;
  font-size: 0.85rem;
  border-radius: 4px;
}

.btn-pwa-dismiss:hover {
  color: var(--text-primary);
  background: var(--bg-subtle);
}

@media (max-width: 480px) {
  .pwa-floating-banner {
    width: calc(100vw - 1.5rem);
    bottom: 0.75rem;
    padding: 0.75rem;
    gap: 0.75rem;
  }
  .pwa-banner-text strong {
    font-size: 0.82rem;
  }
  .pwa-banner-text span {
    font-size: 0.7rem;
  }
  .saved-card-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.25rem;
  }
}