/* ============================================================
   TECHNOLOGY INSIGHTS HUB — MASTER STYLESHEET
   Design: Tech / Minimal | Dark Blue + White + Neon Accents
   ============================================================ */

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

/* ============================================================
   1. CSS CUSTOM PROPERTIES (DESIGN TOKENS)
   ============================================================ */
:root {
  /* Color Palette */
  --color-bg-primary:        #040d1a;
  --color-bg-secondary:      #071428;
  --color-bg-card:           #0a1e3d;
  --color-bg-elevated:       #0d2347;
  --color-bg-surface:        #0f2856;

  --color-blue-deep:         #041030;
  --color-blue-dark:         #071428;
  --color-blue-mid:          #0a2060;
  --color-blue-accent:       #1040a0;

  --color-neon-cyan:         #00f5ff;
  --color-neon-blue:         #0080ff;
  --color-neon-purple:       #8040ff;
  --color-neon-green:        #00ff88;
  --color-neon-pink:         #ff0080;

  --color-text-primary:      #f0f4ff;
  --color-text-secondary:    #a0b4d0;
  --color-text-muted:        #607090;
  --color-text-accent:       #00f5ff;

  --color-border:            rgba(0, 245, 255, 0.12);
  --color-border-hover:      rgba(0, 245, 255, 0.35);
  --color-border-card:       rgba(16, 64, 160, 0.5);

  /* Gradients */
  --gradient-hero:           linear-gradient(135deg, #040d1a 0%, #071428 40%, #0a2060 100%);
  --gradient-card:           linear-gradient(135deg, #0a1e3d 0%, #0d2347 100%);
  --gradient-neon:           linear-gradient(90deg, #00f5ff, #0080ff, #8040ff);
  --gradient-neon-green:     linear-gradient(90deg, #00ff88, #00f5ff);
  --gradient-text:           linear-gradient(135deg, #00f5ff 0%, #0080ff 50%, #8040ff 100%);
  --gradient-overlay:        linear-gradient(180deg, transparent 0%, rgba(4,13,26,0.95) 100%);

  /* Typography */
  --font-primary:            'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono:               'JetBrains Mono', 'Fira Code', monospace;

  --text-xs:    0.75rem;
  --text-sm:    0.875rem;
  --text-base:  1rem;
  --text-lg:    1.125rem;
  --text-xl:    1.25rem;
  --text-2xl:   1.5rem;
  --text-3xl:   1.875rem;
  --text-4xl:   2.25rem;
  --text-5xl:   3rem;
  --text-6xl:   3.75rem;
  --text-7xl:   4.5rem;

  /* Spacing */
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.25rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* Border Radius */
  --radius-sm:   4px;
  --radius-md:   8px;
  --radius-lg:   12px;
  --radius-xl:   16px;
  --radius-2xl:  24px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-neon-cyan:   0 0 20px rgba(0, 245, 255, 0.3);
  --shadow-neon-blue:   0 0 20px rgba(0, 128, 255, 0.3);
  --shadow-neon-purple: 0 0 20px rgba(128, 64, 255, 0.3);
  --shadow-card:        0 4px 24px rgba(0, 0, 0, 0.4);
  --shadow-card-hover:  0 8px 40px rgba(0, 245, 255, 0.15);
  --shadow-elevated:    0 16px 64px rgba(0, 0, 0, 0.6);

  /* Transitions */
  --transition-fast:   150ms ease;
  --transition-base:   250ms ease;
  --transition-slow:   400ms ease;
  --transition-spring: 300ms cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Layout */
  --container-max:  1280px;
  --nav-height:     72px;
  --section-padding: var(--space-24);
}

/* ============================================================
   2. RESET & BASE
   ============================================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

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

img { max-width: 100%; height: auto; display: block; }
a  { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
input, textarea, select { font-family: inherit; }

/* ============================================================
   3. SCROLLBAR
   ============================================================ */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--color-bg-primary); }
::-webkit-scrollbar-thumb {
  background: linear-gradient(var(--color-neon-cyan), var(--color-neon-blue));
  border-radius: var(--radius-full);
}

/* ============================================================
   4. SELECTION
   ============================================================ */
::selection {
  background: rgba(0, 245, 255, 0.25);
  color: var(--color-text-primary);
}

/* ============================================================
   5. TYPOGRAPHY UTILITIES
   ============================================================ */
.text-gradient {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.text-neon { color: var(--color-neon-cyan); }
.text-muted { color: var(--color-text-secondary); }
.text-mono { font-family: var(--font-mono); }

.label {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-neon-cyan);
  font-family: var(--font-mono);
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

/* ============================================================
   6. LAYOUT UTILITIES
   ============================================================ */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.section {
  padding: var(--section-padding) 0;
}

.section-sm {
  padding: var(--space-16) 0;
}

.grid {
  display: grid;
  gap: var(--space-6);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }

/* ============================================================
   7. NAVIGATION
   ============================================================ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-height);
  background: rgba(4, 13, 26, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition-base), box-shadow var(--transition-base);
}

.nav.scrolled {
  background: rgba(4, 13, 26, 0.97);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.5);
}

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

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-weight: 800;
  font-size: var(--text-lg);
  letter-spacing: -0.03em;
}

.nav-logo .logo-icon {
  width: 36px;
  height: 36px;
  background: var(--gradient-neon);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-bg-primary);
  flex-shrink: 0;
}

.nav-logo .logo-text { color: var(--color-text-primary); }
.nav-logo .logo-accent { color: var(--color-neon-cyan); }

.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav-link {
  position: relative;
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
  transition: color var(--transition-fast), background var(--transition-fast);
}

.nav-link:hover {
  color: var(--color-text-primary);
  background: rgba(0, 245, 255, 0.06);
}

.nav-link.active {
  color: var(--color-neon-cyan);
  background: rgba(0, 245, 255, 0.08);
}

.nav-dropdown {
  position: relative;
}

.nav-dropdown-toggle {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: color var(--transition-fast), background var(--transition-fast);
  background: none;
  border: none;
  font-family: inherit;
}

.nav-dropdown-toggle:hover {
  color: var(--color-text-primary);
  background: rgba(0, 245, 255, 0.06);
}

.nav-dropdown-toggle svg {
  transition: transform var(--transition-fast);
}

.nav-dropdown:hover .nav-dropdown-toggle svg {
  transform: rotate(180deg);
}

.nav-dropdown-menu {
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  min-width: 220px;
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-2);
  opacity: 0;
  visibility: hidden;
  transform: translateX(-50%) translateY(-8px);
  transition: opacity var(--transition-fast), visibility var(--transition-fast), transform var(--transition-fast);
  box-shadow: var(--shadow-elevated);
}

.nav-dropdown:hover .nav-dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

.nav-dropdown-item {
  display: block;
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  border-radius: var(--radius-lg);
  transition: color var(--transition-fast), background var(--transition-fast);
}

.nav-dropdown-item:hover {
  color: var(--color-neon-cyan);
  background: rgba(0, 245, 255, 0.08);
}

.nav-cta {
  padding: var(--space-2) var(--space-5);
  background: var(--gradient-neon);
  color: var(--color-bg-primary) !important;
  font-weight: 700;
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  transition: transform var(--transition-spring), box-shadow var(--transition-base), opacity var(--transition-fast);
  box-shadow: 0 0 16px rgba(0, 245, 255, 0.3);
}

.nav-cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 0 24px rgba(0, 245, 255, 0.5);
  opacity: 0.92;
}

/* Hamburger */
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-2);
  cursor: pointer;
}

.nav-hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text-primary);
  border-radius: var(--radius-full);
  transition: transform var(--transition-base), opacity var(--transition-base);
}

/* Mobile Menu */
.nav-mobile {
  display: none;
  position: fixed;
  top: var(--nav-height);
  left: 0;
  right: 0;
  background: rgba(4, 13, 26, 0.98);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-6);
  z-index: 999;
  flex-direction: column;
  gap: var(--space-2);
}

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

.nav-mobile-link {
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  border-radius: var(--radius-lg);
  transition: color var(--transition-fast), background var(--transition-fast);
}

.nav-mobile-link:hover {
  color: var(--color-neon-cyan);
  background: rgba(0, 245, 255, 0.06);
}

/* ============================================================
   8. HERO SECTION
   ============================================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: var(--gradient-hero);
  padding-top: var(--nav-height);
}

.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 245, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 245, 255, 0.04) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 30%, transparent 100%);
}

.hero-glow-1 {
  position: absolute;
  top: 20%;
  left: 10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(0, 128, 255, 0.12) 0%, transparent 70%);
  border-radius: 50%;
  filter: blur(40px);
}

.hero-glow-2 {
  position: absolute;
  bottom: 10%;
  right: 5%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(128, 64, 255, 0.10) 0%, transparent 70%);
  border-radius: 50%;
  filter: blur(40px);
}

.hero-glow-3 {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 800px;
  height: 400px;
  background: radial-gradient(ellipse, rgba(0, 245, 255, 0.05) 0%, transparent 70%);
  filter: blur(60px);
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: rgba(0, 245, 255, 0.08);
  border: 1px solid rgba(0, 245, 255, 0.2);
  border-radius: var(--radius-full);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-neon-cyan);
  margin-bottom: var(--space-6);
}

.hero-eyebrow .dot {
  width: 6px;
  height: 6px;
  background: var(--color-neon-cyan);
  border-radius: 50%;
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.8); }
}

.hero-title {
  font-size: clamp(var(--text-4xl), 6vw, var(--text-7xl));
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: -0.04em;
  color: var(--color-text-primary);
  margin-bottom: var(--space-6);
}

.hero-title .line-accent {
  display: block;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-description {
  font-size: var(--text-xl);
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-10);
  max-width: 600px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  align-items: center;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
  margin-top: var(--space-16);
  padding-top: var(--space-10);
  border-top: 1px solid var(--color-border);
}

.hero-stat-number {
  font-size: var(--text-3xl);
  font-weight: 800;
  font-family: var(--font-mono);
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--space-1);
}

.hero-stat-label {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  letter-spacing: 0.05em;
}

/* ============================================================
   9. BUTTONS
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-8);
  border-radius: var(--radius-full);
  font-size: var(--text-base);
  font-weight: 600;
  font-family: var(--font-primary);
  letter-spacing: -0.01em;
  transition: transform var(--transition-spring), box-shadow var(--transition-base), opacity var(--transition-fast);
  cursor: pointer;
  border: none;
  text-decoration: none;
  white-space: nowrap;
}

.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }

.btn-primary {
  background: var(--gradient-neon);
  color: var(--color-bg-primary);
  box-shadow: 0 0 24px rgba(0, 245, 255, 0.35);
}

.btn-primary:hover {
  box-shadow: 0 0 40px rgba(0, 245, 255, 0.55);
}

.btn-secondary {
  background: transparent;
  color: var(--color-text-primary);
  border: 1px solid var(--color-border-hover);
}

.btn-secondary:hover {
  border-color: var(--color-neon-cyan);
  background: rgba(0, 245, 255, 0.06);
  color: var(--color-neon-cyan);
}

.btn-ghost {
  background: transparent;
  color: var(--color-neon-cyan);
  padding: var(--space-3) var(--space-6);
  font-size: var(--text-sm);
}

.btn-ghost:hover {
  background: rgba(0, 245, 255, 0.08);
}

.btn-sm {
  padding: var(--space-2) var(--space-5);
  font-size: var(--text-sm);
}

.btn-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background: rgba(0, 245, 255, 0.08);
  border: 1px solid var(--color-border);
  color: var(--color-neon-cyan);
  transition: all var(--transition-base);
}

.btn-icon:hover {
  background: rgba(0, 245, 255, 0.15);
  border-color: var(--color-neon-cyan);
  box-shadow: var(--shadow-neon-cyan);
}

/* ============================================================
   10. CARDS
   ============================================================ */
.card {
  background: var(--gradient-card);
  border: 1px solid var(--color-border-card);
  border-radius: var(--radius-2xl);
  padding: var(--space-8);
  transition: transform var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0, 245, 255, 0.5), transparent);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.card:hover {
  transform: translateY(-4px);
  border-color: rgba(0, 245, 255, 0.2);
  box-shadow: var(--shadow-card-hover);
}

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

.card-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-5);
  font-size: 1.5rem;
  flex-shrink: 0;
}

.card-icon-cyan   { background: rgba(0, 245, 255, 0.12); border: 1px solid rgba(0, 245, 255, 0.2); }
.card-icon-blue   { background: rgba(0, 128, 255, 0.12); border: 1px solid rgba(0, 128, 255, 0.2); }
.card-icon-purple { background: rgba(128, 64, 255, 0.12); border: 1px solid rgba(128, 64, 255, 0.2); }
.card-icon-green  { background: rgba(0, 255, 136, 0.12); border: 1px solid rgba(0, 255, 136, 0.2); }
.card-icon-pink   { background: rgba(255, 0, 128, 0.12); border: 1px solid rgba(255, 0, 128, 0.2); }

.card-title {
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--space-3);
  letter-spacing: -0.02em;
}

.card-desc {
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.card-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-5);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-neon-cyan);
  transition: gap var(--transition-fast);
}

.card-link:hover { gap: var(--space-3); }

/* Feature Card */
.feature-card {
  background: var(--gradient-card);
  border: 1px solid var(--color-border-card);
  border-radius: var(--radius-2xl);
  padding: var(--space-10);
  transition: all var(--transition-base);
}

.feature-card:hover {
  border-color: rgba(0, 245, 255, 0.2);
  box-shadow: var(--shadow-card-hover);
}

/* Data Card */
.data-card {
  background: rgba(10, 32, 96, 0.4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  position: relative;
  overflow: hidden;
}

.data-card::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-neon);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base);
}

.data-card:hover::after { transform: scaleX(1); }

/* ============================================================
   11. SECTION HEADERS
   ============================================================ */
.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto var(--space-16);
}

.section-header-left {
  text-align: left;
  max-width: none;
  margin-bottom: var(--space-12);
}

.section-label {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-neon-cyan);
  margin-bottom: var(--space-4);
}

.section-title {
  font-size: clamp(var(--text-3xl), 4vw, var(--text-5xl));
  font-weight: 800;
  color: var(--color-text-primary);
  letter-spacing: -0.03em;
  margin-bottom: var(--space-5);
  line-height: 1.15;
}

.section-desc {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* ============================================================
   12. DIVIDER / DECORATIVE
   ============================================================ */
.neon-divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-neon-cyan), var(--color-neon-blue), transparent);
  opacity: 0.3;
  margin: 0;
}

.neon-line {
  display: inline-block;
  width: 48px;
  height: 3px;
  background: var(--gradient-neon);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-4);
}

/* ============================================================
   13. BADGES / TAGS
   ============================================================ */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.badge-cyan   { background: rgba(0, 245, 255, 0.12);  color: var(--color-neon-cyan);   border: 1px solid rgba(0,245,255,0.2); }
.badge-blue   { background: rgba(0, 128, 255, 0.12);  color: var(--color-neon-blue);   border: 1px solid rgba(0,128,255,0.2); }
.badge-purple { background: rgba(128, 64, 255, 0.12); color: var(--color-neon-purple); border: 1px solid rgba(128,64,255,0.2); }
.badge-green  { background: rgba(0, 255, 136, 0.12);  color: var(--color-neon-green);  border: 1px solid rgba(0,255,136,0.2); }

/* ============================================================
   14. BREADCRUMB
   ============================================================ */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-6);
}

.breadcrumb a { color: var(--color-text-muted); transition: color var(--transition-fast); }
.breadcrumb a:hover { color: var(--color-neon-cyan); }
.breadcrumb-sep { color: var(--color-text-muted); opacity: 0.5; }

/* ============================================================
   15. HERO - INNER PAGES
   ============================================================ */
.page-hero {
  padding: calc(var(--nav-height) + var(--space-16)) 0 var(--space-16);
  background: var(--gradient-hero);
  position: relative;
  overflow: hidden;
}

.page-hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 245, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 245, 255, 0.03) 1px, transparent 1px);
  background-size: 40px 40px;
}

.page-hero-glow {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 300px;
  background: radial-gradient(ellipse 60% 100% at 50% -20%, rgba(0, 128, 255, 0.2) 0%, transparent 70%);
}

/* ============================================================
   16. TOPIC CARDS (Category Pages)
   ============================================================ */
.topic-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: var(--space-6);
}

/* ============================================================
   17. CONTENT LAYOUT (Article / Explainer)
   ============================================================ */
.content-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: var(--space-12);
  align-items: start;
}

.content-body h2 {
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-text-primary);
  margin: var(--space-10) 0 var(--space-4);
  letter-spacing: -0.02em;
}

.content-body h2:first-child { margin-top: 0; }

.content-body h3 {
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--color-text-primary);
  margin: var(--space-8) 0 var(--space-3);
  letter-spacing: -0.01em;
}

.content-body p {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: var(--space-5);
}

.content-body ul {
  list-style: none;
  margin-bottom: var(--space-5);
}

.content-body ul li {
  position: relative;
  padding-left: var(--space-6);
  margin-bottom: var(--space-3);
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.content-body ul li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 6px;
  height: 6px;
  background: var(--color-neon-cyan);
  border-radius: 50%;
}

.content-callout {
  background: rgba(0, 245, 255, 0.05);
  border: 1px solid rgba(0, 245, 255, 0.15);
  border-left: 3px solid var(--color-neon-cyan);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  margin: var(--space-8) 0;
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.content-callout strong {
  color: var(--color-neon-cyan);
  font-weight: 600;
}

/* Sidebar */
.sidebar {
  position: sticky;
  top: calc(var(--nav-height) + var(--space-8));
}

.sidebar-widget {
  background: var(--gradient-card);
  border: 1px solid var(--color-border-card);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  margin-bottom: var(--space-6);
}

.sidebar-widget-title {
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-neon-cyan);
  margin-bottom: var(--space-4);
  font-family: var(--font-mono);
}

.sidebar-link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--color-border);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

.sidebar-link:last-child { border-bottom: none; }

.sidebar-link:hover { color: var(--color-neon-cyan); }

.sidebar-link::before {
  content: '';
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--color-neon-cyan);
  flex-shrink: 0;
}

/* ============================================================
   18. DATA / STATS SECTIONS
   ============================================================ */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-6);
}

.stat-item {
  text-align: center;
  padding: var(--space-6);
  background: rgba(10, 32, 96, 0.3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
}

.stat-number {
  font-size: var(--text-4xl);
  font-weight: 900;
  font-family: var(--font-mono);
  margin-bottom: var(--space-2);
}

.stat-label {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  letter-spacing: 0.05em;
}

/* ============================================================
   19. TIMELINE
   ============================================================ */
.timeline {
  position: relative;
  padding-left: var(--space-8);
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--color-neon-cyan), var(--color-neon-purple), transparent);
}

.timeline-item {
  position: relative;
  padding-bottom: var(--space-8);
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: calc(-1 * var(--space-8) - 5px);
  top: 4px;
  width: 12px;
  height: 12px;
  background: var(--color-neon-cyan);
  border-radius: 50%;
  border: 2px solid var(--color-bg-primary);
  box-shadow: 0 0 8px var(--color-neon-cyan);
}

.timeline-year {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--color-neon-cyan);
  letter-spacing: 0.1em;
  margin-bottom: var(--space-2);
}

.timeline-title {
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--space-2);
}

.timeline-desc {
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* ============================================================
   20. BLOG CARDS
   ============================================================ */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: var(--space-8);
}

.blog-card {
  background: var(--gradient-card);
  border: 1px solid var(--color-border-card);
  border-radius: var(--radius-2xl);
  overflow: hidden;
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

.blog-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-card-hover);
  border-color: rgba(0, 245, 255, 0.2);
}

.blog-card-image {
  height: 200px;
  background: var(--gradient-hero);
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.blog-card-image-inner {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 245, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 245, 255, 0.05) 1px, transparent 1px);
  background-size: 30px 30px;
}

.blog-card-icon {
  position: relative;
  font-size: 3rem;
  z-index: 1;
}

.blog-card-body {
  padding: var(--space-6);
}

.blog-meta {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin-bottom: var(--space-4);
}

.blog-date {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  letter-spacing: 0.05em;
}

.blog-card-title {
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--space-3);
  letter-spacing: -0.02em;
  line-height: 1.35;
}

.blog-card-excerpt {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-5);
}

/* ============================================================
   21. NEWSLETTER / CTA BANNER
   ============================================================ */
.cta-banner {
  background: linear-gradient(135deg, var(--color-bg-elevated) 0%, var(--color-blue-mid) 100%);
  border: 1px solid rgba(0, 245, 255, 0.15);
  border-radius: var(--radius-2xl);
  padding: var(--space-16);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-banner::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: radial-gradient(ellipse 60% 60% at 50% 0%, rgba(0, 245, 255, 0.1) 0%, transparent 70%);
}

.cta-banner-content { position: relative; z-index: 1; }

.cta-banner-title {
  font-size: var(--text-4xl);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-4);
}

.cta-banner-desc {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-8);
}

/* ============================================================
   22. FOOTER
   ============================================================ */
.footer {
  background: var(--color-blue-deep);
  border-top: 1px solid var(--color-border);
  padding: var(--space-20) 0 var(--space-8);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-12);
  margin-bottom: var(--space-12);
}

.footer-brand-desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.8;
  margin: var(--space-4) 0 var(--space-6);
}

.footer-contact-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-3);
  line-height: 1.5;
}

.footer-contact-item span:first-child {
  color: var(--color-neon-cyan);
  font-size: var(--text-base);
  flex-shrink: 0;
}

.footer-col-title {
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-primary);
  margin-bottom: var(--space-5);
  font-family: var(--font-mono);
}

.footer-links { display: flex; flex-direction: column; gap: var(--space-3); }

.footer-link {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}

.footer-link:hover { color: var(--color-neon-cyan); }

.footer-bottom {
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.footer-bottom-text {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.footer-bottom-links {
  display: flex;
  gap: var(--space-6);
}

.footer-bottom-link {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}

.footer-bottom-link:hover { color: var(--color-neon-cyan); }

/* ============================================================
   23. ANIMATIONS
   ============================================================ */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50%       { transform: translateY(-12px); }
}

@keyframes shimmer {
  0%   { background-position: -200% center; }
  100% { background-position: 200% center; }
}

@keyframes neon-pulse {
  0%, 100% { box-shadow: 0 0 8px rgba(0,245,255,0.3); }
  50%       { box-shadow: 0 0 24px rgba(0,245,255,0.7); }
}

.animate-fade-up { animation: fadeInUp 0.6s ease both; }
.animate-fade    { animation: fadeIn  0.6s ease both; }

.delay-100 { animation-delay: 0.1s; }
.delay-200 { animation-delay: 0.2s; }
.delay-300 { animation-delay: 0.3s; }
.delay-400 { animation-delay: 0.4s; }
.delay-500 { animation-delay: 0.5s; }

/* ============================================================
   24. PROGRESS BARS
   ============================================================ */
.progress-bar {
  height: 6px;
  background: rgba(0, 245, 255, 0.1);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin-top: var(--space-2);
}

.progress-fill {
  height: 100%;
  background: var(--gradient-neon);
  border-radius: var(--radius-full);
  transition: width 1s ease;
}

/* ============================================================
   25. TABS
   ============================================================ */
.tabs {
  display: flex;
  gap: var(--space-2);
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--space-8);
  flex-wrap: wrap;
}

.tab {
  padding: var(--space-3) var(--space-5);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  cursor: pointer;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

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

.tab.active {
  color: var(--color-neon-cyan);
  border-bottom-color: var(--color-neon-cyan);
}

/* ============================================================
   26. SEARCH BAR
   ============================================================ */
.search-bar {
  display: flex;
  align-items: center;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  padding: var(--space-2) var(--space-3) var(--space-2) var(--space-5);
  max-width: 480px;
  width: 100%;
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.search-bar:focus-within {
  border-color: rgba(0, 245, 255, 0.4);
  box-shadow: 0 0 0 3px rgba(0, 245, 255, 0.08);
}

.search-bar input {
  flex: 1;
  background: none;
  border: none;
  outline: none;
  font-size: var(--text-sm);
  color: var(--color-text-primary);
}

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

/* ============================================================
   27. RESPONSIVE
   ============================================================ */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .content-layout { grid-template-columns: 1fr; }
  .sidebar { position: static; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  :root { --section-padding: 4rem; }

  .nav-menu { display: none; }
  .nav-hamburger { display: flex; }

  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }

  .hero-stats { grid-template-columns: 1fr; gap: var(--space-4); }
  .hero-actions { flex-direction: column; align-items: flex-start; }

  .footer-grid { grid-template-columns: 1fr; gap: var(--space-8); }
  .footer-bottom { flex-direction: column; text-align: center; }

  .blog-grid { grid-template-columns: 1fr; }
  .topic-grid { grid-template-columns: 1fr; }

  .section-title { font-size: var(--text-3xl); }
  .hero-title { font-size: var(--text-4xl); }
}

@media (max-width: 480px) {
  .container { padding: 0 var(--space-4); }
  .card { padding: var(--space-6); }
  .cta-banner { padding: var(--space-10) var(--space-6); }
}

/* ============================================================
   28. MISCELLANEOUS UTILITIES
   ============================================================ */
.bg-section-alt { background: var(--color-bg-secondary); }
.bg-section-dark { background: var(--color-blue-deep); }
.bg-card { background: var(--gradient-card); }

.mt-auto { margin-top: auto; }
.mb-0 { margin-bottom: 0; }
.text-center { text-align: center; }
.text-left { text-align: left; }

.w-full { width: 100%; }
.max-w-prose { max-width: 720px; }
.mx-auto { margin-left: auto; margin-right: auto; }

.hidden { display: none; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

/* Overflow decorative blobs */
.blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  pointer-events: none;
  z-index: 0;
}

.blob-cyan   { background: rgba(0, 245, 255, 0.06); }
.blob-blue   { background: rgba(0, 128, 255, 0.08); }
.blob-purple { background: rgba(128, 64, 255, 0.07); }

/* Glowing text */
.glow-text {
  text-shadow: 0 0 30px rgba(0, 245, 255, 0.5);
}

/* Code block */
.code-block {
  background: rgba(4, 16, 48, 0.8);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5) var(--space-6);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-neon-green);
  overflow-x: auto;
  line-height: 1.8;
}

/* Numbered steps */
.steps { counter-reset: step; }

.step {
  display: flex;
  gap: var(--space-5);
  padding-bottom: var(--space-8);
  position: relative;
}

.step:not(:last-child)::before {
  content: '';
  position: absolute;
  left: 19px;
  top: 44px;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--color-border-hover), transparent);
}

.step-number {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--gradient-neon);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-bg-primary);
  counter-increment: step;
}

.step-content { flex: 1; padding-top: var(--space-2); }

.step-title {
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--space-2);
}

.step-desc {
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* Comparison table */
.comparison-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
}

.comparison-table th {
  padding: var(--space-4) var(--space-5);
  text-align: left;
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-neon-cyan);
  font-family: var(--font-mono);
  border-bottom: 1px solid var(--color-border);
}

.comparison-table td {
  padding: var(--space-4) var(--space-5);
  color: var(--color-text-secondary);
  border-bottom: 1px solid var(--color-border);
  line-height: 1.6;
}

.comparison-table tr:last-child td { border-bottom: none; }
.comparison-table tr:hover td { background: rgba(0, 245, 255, 0.03); }

/* Back to top */
.back-to-top {
  position: fixed;
  bottom: var(--space-8);
  right: var(--space-8);
  width: 44px;
  height: 44px;
  background: var(--gradient-neon);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-bg-primary);
  font-size: 1.1rem;
  box-shadow: 0 4px 16px rgba(0, 245, 255, 0.4);
  opacity: 0;
  transform: translateY(12px);
  transition: opacity var(--transition-base), transform var(--transition-base);
  cursor: pointer;
  z-index: 900;
}

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