/* ==========================================================================
   TEN 4 GEEKS — Main Global Stylesheet
   Cyberpunk / Retro-Arcade Dark Theme
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Google Fonts Import
   -------------------------------------------------------------------------- */
@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@400;500;600;700;800;900&family=Space+Mono:ital,wght@0,400;0,700;1,400;1,700&family=Rajdhani:wght@300;400;500;600;700&display=swap');

/* --------------------------------------------------------------------------
   2. CSS Custom Properties (Design Tokens)
   -------------------------------------------------------------------------- */
:root {
  /* Colors */
  --color-bg:           #0a0a0f;
  --color-surface:      #13131a;
  --color-border:       #1e1e2e;
  --color-primary:      #00ff88;      /* Neon green */
  --color-secondary:    #ff3366;      /* Hot pink */
  --color-tertiary:     #7c3aed;      /* Electric purple */
  --color-text:         #e8e8e8;
  --color-text-muted:   #888899;
  --color-gold:         #ffd700;

  /* Derived / Tinted Colors */
  --color-primary-dim:     rgba(0, 255, 136, 0.15);
  --color-secondary-dim:   rgba(255, 51, 102, 0.15);
  --color-tertiary-dim:    rgba(124, 58, 237, 0.15);
  --color-primary-glow:    0 0 8px rgba(0, 255, 136, 0.6), 0 0 20px rgba(0, 255, 136, 0.3);
  --color-secondary-glow:  0 0 8px rgba(255, 51, 102, 0.6), 0 0 20px rgba(255, 51, 102, 0.3);
  --color-tertiary-glow:   0 0 8px rgba(124, 58, 237, 0.6), 0 0 20px rgba(124, 58, 237, 0.3);

  /* Fonts */
  --font-heading:  'Orbitron', 'Courier New', monospace;
  --font-body:     'Space Mono', 'Courier New', monospace;
  --font-nav:      'Rajdhani', 'Arial', sans-serif;

  /* Font Sizes */
  --fs-xs:   0.75rem;    /*  12px */
  --fs-sm:   0.875rem;   /*  14px */
  --fs-base: 1rem;       /*  16px */
  --fs-md:   1.125rem;   /*  18px */
  --fs-lg:   1.25rem;    /*  20px */
  --fs-xl:   1.5rem;     /*  24px */
  --fs-2xl:  1.875rem;   /*  30px */
  --fs-3xl:  2.25rem;    /*  36px */
  --fs-4xl:  3rem;       /*  48px */
  --fs-5xl:  3.75rem;    /*  60px */

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

  /* Borders & Radius */
  --radius-sm:  4px;
  --radius-md:  8px;
  --radius-lg:  12px;
  --radius-xl:  16px;
  --radius-full: 9999px;
  --border-width: 1px;

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

  /* Layout */
  --container-max:  1200px;
  --nav-height:     64px;
  --sidebar-width:  260px;

  /* Z-index layers */
  --z-below:    -1;
  --z-base:      0;
  --z-raised:   10;
  --z-dropdown: 100;
  --z-sticky:   200;
  --z-modal:    300;
  --z-toast:    400;
}

/* --------------------------------------------------------------------------
   3. CSS Reset / Normalize
   -------------------------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  tab-size: 4;
}

body {
  font-family: var(--font-body);
  font-size: var(--fs-base);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img, video, svg {
  display: block;
  max-width: 100%;
  height: auto;
}

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

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

ul, ol {
  list-style: none;
}

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
  border: none;
  outline: none;
  background: none;
}

button {
  cursor: pointer;
}

table {
  border-collapse: collapse;
  border-spacing: 0;
}

/* --------------------------------------------------------------------------
   4. Grid / Scanline Background Texture (CSS Only)
   -------------------------------------------------------------------------- */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: var(--z-below);
  background-image:
    linear-gradient(
      rgba(0, 255, 136, 0.03) 1px,
      transparent 1px
    ),
    linear-gradient(
      90deg,
      rgba(0, 255, 136, 0.03) 1px,
      transparent 1px
    );
  background-size: 40px 40px;
  pointer-events: none;
}

body::after {
  content: '';
  position: fixed;
  inset: 0;
  z-index: var(--z-below);
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0, 0, 0, 0.08) 2px,
    rgba(0, 0, 0, 0.08) 4px
  );
  pointer-events: none;
}

/* --------------------------------------------------------------------------
   5. Custom Scrollbar (WebKit)
   -------------------------------------------------------------------------- */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-surface);
}

::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-primary);
}

/* Firefox */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--color-border) var(--color-surface);
}

/* --------------------------------------------------------------------------
   6. Base Typography
   -------------------------------------------------------------------------- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-text);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

h1 { font-size: var(--fs-4xl); }
h2 { font-size: var(--fs-3xl); }
h3 { font-size: var(--fs-2xl); }
h4 { font-size: var(--fs-xl); }
h5 { font-size: var(--fs-lg); }
h6 { font-size: var(--fs-md); }

p {
  margin-bottom: var(--sp-4);
  color: var(--color-text);
}

p:last-child {
  margin-bottom: 0;
}

strong, b {
  font-weight: 700;
  color: var(--color-text);
}

em, i {
  font-style: italic;
}

small {
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
}

code, pre {
  font-family: var(--font-body);
  background: var(--color-surface);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-primary);
}

code {
  padding: 0.1em 0.4em;
  font-size: 0.9em;
}

pre {
  padding: var(--sp-4);
  overflow-x: auto;
}

blockquote {
  border-left: 3px solid var(--color-primary);
  padding-left: var(--sp-4);
  color: var(--color-text-muted);
  font-style: italic;
  margin: var(--sp-4) 0;
}

hr {
  border: none;
  border-top: var(--border-width) solid var(--color-border);
  margin: var(--sp-8) 0;
}

/* --------------------------------------------------------------------------
   7. Layout / Container
   -------------------------------------------------------------------------- */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--sp-6);
  width: 100%;
}

.container--narrow {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 var(--sp-6);
}

.main-content {
  padding-top: var(--nav-height);
  min-height: calc(100vh - var(--nav-height));
}

/* --------------------------------------------------------------------------
   8. Sticky Navigation Bar
   -------------------------------------------------------------------------- */
.site-nav {
  position: sticky;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-sticky);
  height: var(--nav-height);
  background: rgba(10, 10, 15, 0.95);
  border-bottom: var(--border-width) solid var(--color-border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--sp-6);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  flex-shrink: 0;
}

.nav-logo img,
.nav-logo svg {
  height: 36px;
  width: auto;
}

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

.nav-links a {
  font-family: var(--font-nav);
  font-size: var(--fs-md);
  font-weight: 600;
  color: var(--color-text-muted);
  padding: var(--sp-2) var(--sp-4);
  border-radius: var(--radius-sm);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  transition: color var(--transition-fast), background var(--transition-fast);
  text-decoration: none;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--color-primary);
  background: var(--color-primary-dim);
  text-decoration: none;
}

.nav-links a.active {
  box-shadow: inset 0 -2px 0 var(--color-primary);
}

/* Nav Dropdown */
.nav-dropdown {
  position: relative;
}

.nav-dropdown-menu {
  position: absolute;
  top: calc(100% + var(--sp-2));
  left: 0;
  min-width: 220px;
  background: var(--color-surface);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: opacity var(--transition-base), transform var(--transition-base), visibility var(--transition-base);
  z-index: var(--z-dropdown);
}

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

.nav-dropdown-menu a {
  display: block;
  padding: var(--sp-3) var(--sp-5);
  color: var(--color-text-muted);
  font-family: var(--font-nav);
  font-size: var(--fs-base);
  border-radius: 0;
  border-bottom: var(--border-width) solid var(--color-border);
}

.nav-dropdown-menu a:last-child {
  border-bottom: none;
}

.nav-dropdown-menu a:hover {
  color: var(--color-primary);
  background: var(--color-primary-dim);
}

/* Nav Search */
.nav-search {
  display: flex;
  align-items: center;
  background: var(--color-surface);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--radius-full);
  padding: var(--sp-2) var(--sp-4);
  gap: var(--sp-2);
  transition: border-color var(--transition-fast);
}

.nav-search:focus-within {
  border-color: var(--color-primary);
  box-shadow: var(--color-primary-glow);
}

.nav-search input {
  background: none;
  color: var(--color-text);
  width: 180px;
  font-size: var(--fs-sm);
}

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

.nav-search-icon {
  color: var(--color-text-muted);
  width: 16px;
  height: 16px;
}

/* Hamburger Menu */
.nav-hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: none;
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  padding: var(--sp-2);
  transition: border-color var(--transition-fast);
}

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

.nav-hamburger span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-text);
  border-radius: 1px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

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

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

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

/* Mobile Nav Overlay */
.nav-mobile-overlay {
  display: none;
  position: fixed;
  inset: var(--nav-height) 0 0 0;
  background: rgba(10, 10, 15, 0.98);
  border-top: var(--border-width) solid var(--color-border);
  z-index: calc(var(--z-sticky) - 1);
  padding: var(--sp-6);
  flex-direction: column;
  gap: var(--sp-2);
  backdrop-filter: blur(12px);
}

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

.nav-mobile-overlay a {
  font-family: var(--font-nav);
  font-size: var(--fs-xl);
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: var(--sp-3) 0;
  border-bottom: var(--border-width) solid var(--color-border);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.nav-mobile-overlay a:hover {
  color: var(--color-primary);
}

/* --------------------------------------------------------------------------
   9. Hero Section
   -------------------------------------------------------------------------- */
.hero {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 70vh;
  padding: var(--sp-20) var(--sp-6);
  overflow: hidden;
  background: var(--color-bg);
}

/* Noise / Dark Overlay via pseudo-element */
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% 0%, rgba(124, 58, 237, 0.12) 0%, transparent 70%),
    radial-gradient(ellipse 60% 40% at 80% 100%, rgba(0, 255, 136, 0.08) 0%, transparent 70%);
  z-index: 0;
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.04'/%3E%3C/svg%3E");
  background-size: 200px;
  opacity: 0.4;
  z-index: 0;
  pointer-events: none;
}

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

.hero-eyebrow {
  font-family: var(--font-nav);
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--color-secondary);
  text-transform: uppercase;
  letter-spacing: 0.3em;
  margin-bottom: var(--sp-4);
  display: block;
}

.hero-title {
  font-size: clamp(var(--fs-3xl), 6vw, var(--fs-5xl));
  color: var(--color-text);
  margin-bottom: var(--sp-6);
  animation: neonFlicker 4s ease-in-out infinite;
}

.hero-title .accent {
  color: var(--color-primary);
  animation: neonGlow 2s ease-in-out infinite alternate;
}

.hero-title .accent-pink {
  color: var(--color-secondary);
  animation: neonGlowPink 2.5s ease-in-out infinite alternate;
}

.hero-subtitle {
  font-family: var(--font-body);
  font-size: var(--fs-md);
  color: var(--color-text-muted);
  max-width: 560px;
  margin: 0 auto var(--sp-8);
  line-height: 1.8;
}

.hero-cta-group {
  display: flex;
  gap: var(--sp-4);
  justify-content: center;
  flex-wrap: wrap;
}

/* --------------------------------------------------------------------------
   10. Neon Text Glow Keyframes
   -------------------------------------------------------------------------- */
@keyframes neonGlow {
  from {
    text-shadow:
      0 0 4px var(--color-primary),
      0 0 10px var(--color-primary),
      0 0 20px var(--color-primary),
      0 0 40px rgba(0, 255, 136, 0.5);
  }
  to {
    text-shadow:
      0 0 6px var(--color-primary),
      0 0 16px var(--color-primary),
      0 0 30px var(--color-primary),
      0 0 60px rgba(0, 255, 136, 0.7),
      0 0 80px rgba(0, 255, 136, 0.3);
  }
}

@keyframes neonGlowPink {
  from {
    text-shadow:
      0 0 4px var(--color-secondary),
      0 0 10px var(--color-secondary),
      0 0 20px var(--color-secondary);
  }
  to {
    text-shadow:
      0 0 8px var(--color-secondary),
      0 0 20px var(--color-secondary),
      0 0 40px rgba(255, 51, 102, 0.7);
  }
}

@keyframes neonFlicker {
  0%, 95%, 100% { opacity: 1; }
  96%            { opacity: 0.85; }
  97%            { opacity: 1; }
  98%            { opacity: 0.9; }
}

@keyframes neonPulse {
  0%, 100% {
    box-shadow: 0 0 5px var(--color-primary), 0 0 10px rgba(0,255,136,0.3);
  }
  50% {
    box-shadow: 0 0 12px var(--color-primary), 0 0 24px rgba(0,255,136,0.5), 0 0 40px rgba(0,255,136,0.2);
  }
}

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

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* --------------------------------------------------------------------------
   11. Buttons (Global)
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  font-family: var(--font-nav);
  font-size: var(--fs-md);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: var(--sp-3) var(--sp-6);
  border-radius: var(--radius-sm);
  border: 2px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition:
    background var(--transition-base),
    color var(--transition-base),
    border-color var(--transition-base),
    box-shadow var(--transition-base),
    transform var(--transition-fast);
}

.btn:hover {
  text-decoration: none;
  transform: translateY(-2px);
}

.btn:active {
  transform: translateY(0);
}

.btn-primary {
  background: var(--color-primary);
  color: var(--color-bg);
  border-color: var(--color-primary);
}

.btn-primary:hover {
  background: transparent;
  color: var(--color-primary);
  box-shadow: var(--color-primary-glow);
}

.btn-secondary {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn-secondary:hover {
  background: var(--color-primary-dim);
  box-shadow: var(--color-primary-glow);
}

.btn-pink {
  background: var(--color-secondary);
  color: #fff;
  border-color: var(--color-secondary);
}

.btn-pink:hover {
  background: transparent;
  color: var(--color-secondary);
  box-shadow: var(--color-secondary-glow);
}

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

.btn-ghost:hover {
  color: var(--color-text);
  border-color: var(--color-text-muted);
}

.btn-sm {
  font-size: var(--fs-sm);
  padding: var(--sp-2) var(--sp-4);
}

.btn-lg {
  font-size: var(--fs-lg);
  padding: var(--sp-4) var(--sp-8);
}

/* --------------------------------------------------------------------------
   12. Breadcrumbs
   -------------------------------------------------------------------------- */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--sp-2);
  padding: var(--sp-4) 0;
  font-family: var(--font-nav);
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
}

.breadcrumb-item {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
}

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

.breadcrumb-item a:hover {
  color: var(--color-primary);
}

.breadcrumb-item.active {
  color: var(--color-primary);
}

.breadcrumb-separator {
  color: var(--color-border);
}

.breadcrumb-separator::before {
  content: '›';
  font-size: var(--fs-md);
}

/* --------------------------------------------------------------------------
   13. Pagination
   -------------------------------------------------------------------------- */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  padding: var(--sp-8) 0;
  flex-wrap: wrap;
}

.pagination-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 40px;
  padding: 0 var(--sp-3);
  background: var(--color-surface);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  font-family: var(--font-nav);
  font-size: var(--fs-sm);
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.pagination-btn:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
  background: var(--color-primary-dim);
  text-decoration: none;
}

.pagination-btn.active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-bg);
  box-shadow: var(--color-primary-glow);
}

.pagination-btn.disabled,
.pagination-btn[disabled] {
  opacity: 0.4;
  cursor: not-allowed;
  pointer-events: none;
}

.pagination-ellipsis {
  color: var(--color-text-muted);
  padding: 0 var(--sp-2);
}

/* --------------------------------------------------------------------------
   14. Footer
   -------------------------------------------------------------------------- */
.site-footer {
  background: var(--color-surface);
  border-top: var(--border-width) solid var(--color-border);
  margin-top: var(--sp-20);
}

.footer-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--sp-16) var(--sp-6) var(--sp-8);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--sp-10);
  margin-bottom: var(--sp-12);
}

.footer-brand .nav-logo {
  margin-bottom: var(--sp-4);
}

.footer-brand p {
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
  line-height: 1.8;
}

.footer-col h4 {
  font-size: var(--fs-sm);
  color: var(--color-primary);
  margin-bottom: var(--sp-4);
  letter-spacing: 0.15em;
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
}

.footer-col ul a {
  font-family: var(--font-nav);
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-col ul a:hover {
  color: var(--color-primary);
}

.footer-bottom {
  border-top: var(--border-width) solid var(--color-border);
  padding-top: var(--sp-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--sp-4);
}

.footer-bottom p {
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
  margin: 0;
}

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

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

.footer-disclaimer {
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
  margin-top: var(--sp-4);
  line-height: 1.8;
  border-top: var(--border-width) solid var(--color-border);
  padding-top: var(--sp-4);
  opacity: 0.7;
}

/* --------------------------------------------------------------------------
   15. Section Headings / Dividers
   -------------------------------------------------------------------------- */
.section-header {
  text-align: center;
  margin-bottom: var(--sp-12);
}

.section-header h2 {
  margin-bottom: var(--sp-4);
  position: relative;
  display: inline-block;
}

.section-header h2::after {
  content: '';
  display: block;
  width: 60px;
  height: 3px;
  background: var(--color-primary);
  margin: var(--sp-4) auto 0;
  box-shadow: var(--color-primary-glow);
}

.section-header p {
  color: var(--color-text-muted);
  max-width: 560px;
  margin: 0 auto;
}

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

.section--alt {
  background: var(--color-surface);
}

/* --------------------------------------------------------------------------
   16. Page Progress Indicator
   -------------------------------------------------------------------------- */
#page-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-tertiary));
  z-index: calc(var(--z-toast) + 1);
  width: 0%;
  transition: width 0.1s linear;
  box-shadow: 0 0 8px rgba(0, 255, 136, 0.6);
}

/* --------------------------------------------------------------------------
   17. Utility Classes
   -------------------------------------------------------------------------- */

/* Display */
.d-none    { display: none !important; }
.d-block   { display: block !important; }
.d-flex    { display: flex !important; }
.d-grid    { display: grid !important; }
.d-inline  { display: inline !important; }
.d-inline-block { display: inline-block !important; }
.d-inline-flex  { display: inline-flex !important; }

/* Flex helpers */
.flex-center  { display: flex; align-items: center; justify-content: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.flex-wrap    { flex-wrap: wrap; }
.flex-col     { flex-direction: column; }
.gap-2  { gap: var(--sp-2); }
.gap-4  { gap: var(--sp-4); }
.gap-6  { gap: var(--sp-6); }
.gap-8  { gap: var(--sp-8); }

/* Text alignment */
.text-left    { text-align: left; }
.text-center  { text-align: center; }
.text-right   { text-align: right; }

/* Text color */
.text-primary   { color: var(--color-primary); }
.text-secondary { color: var(--color-secondary); }
.text-tertiary  { color: var(--color-tertiary); }
.text-muted     { color: var(--color-text-muted); }
.text-gold      { color: var(--color-gold); }

/* Font */
.font-heading { font-family: var(--font-heading); }
.font-body    { font-family: var(--font-body); }
.font-nav     { font-family: var(--font-nav); }
.fw-normal    { font-weight: 400; }
.fw-bold      { font-weight: 700; }
.uppercase    { text-transform: uppercase; }
.tracking-wide { letter-spacing: 0.1em; }

/* Margin helpers */
.mt-0  { margin-top: 0; }
.mt-4  { margin-top: var(--sp-4); }
.mt-8  { margin-top: var(--sp-8); }
.mb-0  { margin-bottom: 0; }
.mb-4  { margin-bottom: var(--sp-4); }
.mb-8  { margin-bottom: var(--sp-8); }

/* Padding helpers */
.p-4  { padding: var(--sp-4); }
.p-6  { padding: var(--sp-6); }
.p-8  { padding: var(--sp-8); }
.py-4 { padding-top: var(--sp-4); padding-bottom: var(--sp-4); }
.py-8 { padding-top: var(--sp-8); padding-bottom: var(--sp-8); }
.px-4 { padding-left: var(--sp-4); padding-right: var(--sp-4); }
.px-6 { padding-left: var(--sp-6); padding-right: var(--sp-6); }

/* Width */
.w-full  { width: 100%; }
.w-auto  { width: auto; }

/* Visual */
.rounded    { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }
.border     { border: var(--border-width) solid var(--color-border); }
.surface    { background: var(--color-surface); }
.shadow     { box-shadow: 0 4px 20px rgba(0,0,0,0.4); }
.glow-primary   { box-shadow: var(--color-primary-glow); }
.glow-secondary { box-shadow: var(--color-secondary-glow); }

/* Animation */
.fade-in-up { animation: fadeInUp 0.5s ease forwards; }
.animate-neon { animation: neonGlow 2s ease-in-out infinite alternate; }

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

/* Neon border effect */
.neon-border {
  border: var(--border-width) solid var(--color-primary);
  box-shadow: 0 0 6px rgba(0,255,136,0.4), inset 0 0 6px rgba(0,255,136,0.05);
}

/* --------------------------------------------------------------------------
   18. Responsive Breakpoints
   -------------------------------------------------------------------------- */

/* Tablet: 768px */
@media (max-width: 768px) {
  :root {
    --nav-height: 56px;
  }

  h1 { font-size: var(--fs-3xl); }
  h2 { font-size: var(--fs-2xl); }
  h3 { font-size: var(--fs-xl); }

  .container {
    padding: 0 var(--sp-4);
  }

  .nav-links,
  .nav-search {
    display: none;
  }

  .nav-hamburger {
    display: flex;
  }

  .hero {
    min-height: 60vh;
    padding: var(--sp-16) var(--sp-4);
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--sp-8);
  }

  .footer-brand {
    grid-column: 1 / -1;
  }

  .section {
    padding: var(--sp-12) 0;
  }
}

/* Mobile: below 480px */
@media (max-width: 480px) {
  h1 { font-size: var(--fs-2xl); }
  h2 { font-size: var(--fs-xl); }

  .container {
    padding: 0 var(--sp-4);
  }

  .hero-cta-group {
    flex-direction: column;
    align-items: center;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }

  .btn {
    font-size: var(--fs-sm);
    padding: var(--sp-3) var(--sp-5);
  }

  .pagination {
    gap: var(--sp-1);
  }

  .pagination-btn {
    min-width: 36px;
    height: 36px;
  }
}

/* Desktop: 1200px+ */
@media (min-width: 1200px) {
  .container {
    padding: 0 var(--sp-8);
  }
}