/* Fonts loaded via <link> in each HTML file */
:root {
  /* Premium Dark Theme Core */
  --bg-deep: #030712;         /* Very dark, almost black */
  --bg-surface: #0a0f1d;      /* Slightly lighter for cards */
  --bg-elevated: #111827;     /* Elevated elements */
  --bg-glass: rgba(17, 24, 39, 0.4); 
  --bg-glass-heavy: rgba(17, 24, 39, 0.75);

  /* Typography */
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  /* Accent Colors (Elos Brand updated for modern feel) */
  --accent-base: #2563eb;     /* Blue */
  --accent-light: #60a5fa;
  --accent-glow: #3b82f6;     
  --accent-secondary: #0ea5e9; /* Cyan variant */
  
  /* Utilities */
  --radius-sm: 0.5rem;
  --radius-md: 1rem;
  --radius-lg: 1.5rem;
  --radius-pill: 9999px;
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-focus: rgba(96, 165, 250, 0.3);

  /* Shadows */
  --shadow-glow: 0 0 24px rgba(59, 130, 246, 0.2);
  --shadow-hover: 0 10px 40px rgba(59, 130, 246, 0.15);
  
  /* Animations */
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.5s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-bounce: 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', sans-serif;
  background-color: var(--bg-deep);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
  -webkit-font-smoothing: antialiased;
}

body.menu-open {
  overflow: hidden;
}

body ::selection {
  background-color: rgba(168, 85, 247, 0.42);
  color: #ffffff;
}

body ::-moz-selection {
  background-color: rgba(168, 85, 247, 0.42);
  color: #ffffff;
}

img {
  max-width: 100%;
  height: auto;
}

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

.skip-link {
  position: absolute;
  top: -3rem;
  left: 1rem;
  z-index: 10000;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  background: var(--bg-elevated);
  color: var(--text-primary);
  text-decoration: none;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 1rem;
}

/* Subtle background noise / grid */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: -2;
  background: 
    linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(circle at center, black 20%, transparent 80%);
  pointer-events: none;
}

/* Ambient Glows */
body::after {
  content: '';
  position: fixed;
  top: -20vh;
  left: -20vw;
  width: 70vw;
  height: 70vh;
  background: radial-gradient(circle, rgba(37, 99, 235, 0.1) 0%, transparent 70%);
  z-index: -1;
  pointer-events: none;
}

/* Typography Classes */
h1, h2, h3, h4, h5, h6 {
  font-family: 'Manrope', sans-serif;
  line-height: 1.1;
  letter-spacing: -0.03em;
  font-weight: 700;
}

.text-gradient {
  background: linear-gradient(135deg, #fff 0%, #94a3b8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.text-accent-gradient {
  background: linear-gradient(135deg, var(--accent-light) 0%, var(--accent-base) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.eyebrow {
  display: inline-block;
  text-transform: uppercase;
  font-weight: 700;
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  color: var(--accent-light);
  margin-bottom: 1rem;
}

/* Layout Utilities */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 2rem;
}

.section {
  padding: 8rem 0;
  position: relative;
}

/* Components */
.glass-panel {
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.875rem 2rem;
  border-radius: var(--radius-pill);
  font-family: 'Manrope', sans-serif;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  transition: var(--transition-bounce);
  cursor: pointer;
  border: none;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-light), var(--accent-base));
  color: #fff;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.5);
}

.btn-primary::after {
  content: '';
  position: absolute;
  top: 0; left: -100%; width: 100%; height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  transition: var(--transition-smooth);
}
.btn-primary:hover::after {
  left: 100%;
}

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

.btn-secondary:hover {
  border-color: var(--accent-light);
  background: rgba(255,255,255,0.03);
  transform: translateY(-2px);
}

/* Navbar */
.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 100;
  padding: 1.5rem 0;
  transition: var(--transition-smooth);
}

.navbar.scrolled {
  padding: 1rem 0;
  background: rgba(17, 24, 39, 0.63);
  backdrop-filter: blur(23px);
  -webkit-backdrop-filter: blur(23px);
  border-bottom: 1px solid var(--border-subtle);
}

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

.brand {
  display: inline-flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.2rem;
  text-decoration: none;
}

.brand-mark {
  display: none;
}

.brand-name {
  font-family: 'Orbitron', sans-serif;
  font-weight: 800;
  font-size: 1.35rem;
  letter-spacing: 0.18em;
  background: linear-gradient(160deg, #ffffff 0%, #c8d8f0 45%, #ffffff 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 0 12px rgba(125, 229, 253, 0.25));
  line-height: 1;
}

.brand-sub {
  font-family: 'Exo 2', sans-serif;
  font-weight: 300;
  font-size: 0.6rem;
  letter-spacing: 0.35em;
  color: #2DB8FA;
  text-shadow: 0 0 16px rgba(45, 184, 250, 0.5);
  text-transform: uppercase;
  line-height: 1;
}

.brand-line {
  display: block;
  width: 5.5rem; /* ~88px — matches Orbitron "ELOS" width at 1.35rem/0.18em */
  height: 1px;
  background: linear-gradient(90deg, #298BD9 0%, #2DB8FA 50%, #7EE5FD 100%);
  box-shadow: 0 0 8px rgba(45, 184, 250, 0.7), 0 0 20px rgba(45, 184, 250, 0.3);
  border: none;
  border-radius: 1px;
  margin: 1px 0;
}

.nav-links {
  display: flex;
  gap: 2.5rem;
}

.nav-actions {
  display: flex;
  align-items: center;
}

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 3rem;
  height: 3rem;
  border-radius: 9999px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(17, 24, 39, 0.82);
  color: var(--text-primary);
  cursor: pointer;
  transition: var(--transition-fast);
}

.nav-toggle:hover {
  border-color: rgba(96, 165, 250, 0.4);
  background: rgba(30, 41, 59, 0.92);
}

.nav-toggle-line {
  display: block;
  width: 1.1rem;
  height: 2px;
  border-radius: 9999px;
  background: currentColor;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.nav-toggle-icon {
  display: flex;
  flex-direction: column;
  gap: 0.24rem;
}

.nav-link {
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
  text-decoration: none;
  transition: var(--transition-fast);
  position: relative;
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-light);
  transition: var(--transition-smooth);
}

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

/* Scroll Animations (Intersection Observer Targets) */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}

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

.reveal-left {
  opacity: 0;
  transform: translateX(-40px);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal-left.visible {
  opacity: 1;
  transform: translateX(0);
}

.reveal-right {
  opacity: 0;
  transform: translateX(40px);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal-right.visible {
  opacity: 1;
  transform: translateX(0);
}

.delay-100 { transition-delay: 100ms; }
.delay-200 { transition-delay: 200ms; }
.delay-300 { transition-delay: 300ms; }
.delay-400 { transition-delay: 400ms; }

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 10px;
}
::-webkit-scrollbar-track {
  background: var(--bg-deep);
}
::-webkit-scrollbar-thumb {
  background: var(--bg-elevated);
  border-radius: 5px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* Footer (Shared across pages) */
.footer {
  border-top: 1px solid var(--border-subtle);
  padding: 6rem 0 3rem;
  background: radial-gradient(circle at bottom, rgba(37, 99, 235, 0.05) 0%, var(--bg-deep) 100%);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 4rem;
  margin-bottom: 4rem;
}

.footer-desc {
  color: var(--text-secondary);
  margin-top: 1.5rem;
  max-width: 300px;
}

.footer-heading {
  color: var(--text-primary);
  font-size: 1.1rem;
  margin-bottom: 1.5rem;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: var(--transition-fast);
}

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

.footer-bottom {
  border-top: 1px solid var(--border-subtle);
  padding-top: 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text-muted);
  font-size: 0.875rem;
}

/* Responsive constraints */
@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .container {
    padding: 0 1.25rem;
  }

  .section {
    padding: 5rem 0;
  }

  .navbar {
    padding: 1rem 0;
  }

  .nav-container {
    flex-wrap: wrap;
    gap: 0.9rem;
  }

  .nav-toggle {
    display: inline-flex;
    margin-left: auto;
  }

  .nav-links,
  .nav-actions {
    width: 100%;
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    pointer-events: none;
    transition: max-height var(--transition-smooth), opacity var(--transition-fast);
  }

  .nav-links {
    order: 3;
    flex-direction: column;
    gap: 0.7rem;
  }

  .nav-actions {
    order: 4;
  }

  .navbar.menu-open .nav-links,
  .navbar.menu-open .nav-actions {
    max-height: 24rem;
    opacity: 1;
    pointer-events: auto;
  }

  .navbar.menu-open .nav-toggle-line:nth-child(1) {
    transform: translateY(0.37rem) rotate(45deg);
  }

  .navbar.menu-open .nav-toggle-line:nth-child(2) {
    opacity: 0;
  }

  .navbar.menu-open .nav-toggle-line:nth-child(3) {
    transform: translateY(-0.37rem) rotate(-45deg);
  }

  .nav-link {
    display: block;
    padding: 0.95rem 1rem;
    border-radius: var(--radius-md);
    background: rgba(17, 24, 39, 0.88);
    border: 1px solid rgba(255, 255, 255, 0.06);
  }

  .nav-link::after {
    display: none;
  }

  .nav-actions .btn {
    width: 100%;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }

  .footer {
    padding: 4rem 0 2.5rem;
  }
}

@media (max-width: 480px) {
  .brand-name {
    font-size: 1.1rem;
  }

  .brand-line {
    width: 4.6rem;
  }

  .brand-sub {
    font-size: 0.52rem;
    letter-spacing: 0.28em;
  }

  .btn {
    padding: 0.85rem 1.35rem;
    font-size: 0.9rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}