:root {
  --color-bg-base: #0f172a;
  --color-bg-surface: rgba(30, 41, 59, 0.7);
  --color-bg-glass: rgba(15, 23, 42, 0.5);
  --color-text-main: #f8fafc;
  --color-text-muted: #94a3b8;
  --color-primary: #3b82f6;
  --color-primary-glow: rgba(59, 130, 246, 0.5);
  --color-secondary: #ec4899;
  --color-accent: #8b5cf6;
  --color-border: rgba(255, 255, 255, 0.1);
  --font-heading: 'Outfit', 'Inter', sans-serif;
  --font-body: 'Inter', sans-serif;
  --transition-smooth: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  --header-height: 80px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  background-color: var(--color-bg-base);
  color: var(--color-text-main);
  font-family: var(--font-body);
  line-height: 1.6;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-smooth);
}

ul {
  list-style: none;
}

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

/* Utilities */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 5%;
}

.section {
  padding: 100px 0;
}

.text-gradient {
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.glass-panel {
  background: var(--color-bg-surface);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--color-border);
  border-radius: 16px;
  padding: 2rem;
  transition: transform var(--transition-smooth), box-shadow var(--transition-smooth);
}

.glass-panel:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 30px var(--color-primary-glow);
}

/* Header */
.site-header {
  position: fixed;
  top: 0;
  width: 100%;
  height: var(--header-height);
  background: var(--color-bg-glass);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  z-index: 1000;
  transition: background var(--transition-smooth);
}

.site-header.scrolled {
  background: var(--color-bg-surface);
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
}

.logo {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.5px;
}

.main-nav ul {
  display: flex;
  gap: 2rem;
}

.main-nav a {
  font-weight: 500;
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  position: relative;
}

.main-nav a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0%;
  height: 2px;
  background: gradient(linear, left top, right top, from(var(--color-primary)), to(var(--color-secondary)));
  background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
  transition: width var(--transition-smooth);
}

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

.btn-primary {
  display: inline-block;
  padding: 12px 28px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: white;
  border-radius: 30px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  border: none;
  cursor: pointer;
  transition: transform var(--transition-smooth), box-shadow var(--transition-smooth);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px var(--color-primary-glow);
}

/* Page Header (Internal pages) */
.page-header {
  padding: calc(var(--header-height) + 100px) 0 80px;
  text-align: center;
  position: relative;
}

.page-header h1 {
  font-size: 4rem;
  margin-bottom: 20px;
}

.page-header p {
  color: var(--color-text-muted);
  font-size: 1.25rem;
  max-width: 600px;
  margin: 0 auto;
}

/* Animations */
.fade-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Footer */
.site-footer {
  background: var(--color-bg-surface);
  border-top: 1px solid var(--color-border);
  padding: 60px 0 30px;
  margin-top: 50px;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 40px;
  margin-bottom: 40px;
}

.footer-branding h2 {
  font-size: 1.5rem;
  margin-bottom: 15px;
}

.footer-branding p {
  color: var(--color-text-muted);
  max-width: 300px;
}

.footer-links h3 {
  font-size: 1.1rem;
  margin-bottom: 20px;
}

.footer-links ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

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

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

.footer-bottom {
  text-align: center;
  color: var(--color-text-muted);
  padding-top: 30px;
  border-top: 1px solid var(--color-border);
}

/* Responsive */
@media (max-width: 768px) {
  .main-nav {
    display: none; /* simple mobile hide for now, would need a hamburger menu */
  }
  .page-header h1 {
    font-size: 2.5rem;
  }
}