:root {
  --bg-color: #000000;
  --bg-secondary: #1d1d1f;
  --text-primary: #f5f5f7;
  --text-secondary: #86868b;
  --accent-color: #2997ff;
  --nav-height: 44px;
  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
}

body {
  background-color: var(--bg-color);
  color: var(--text-primary);
  font-family: var(--font-main);
  line-height: 1.5;
  overflow-x: hidden;
}

a {
  text-decoration: none;
  color: inherit;
  transition: color 0.3s ease;
}

ul {
  list-style: none;
}

/* Typography */
h1 {
  font-size: 56px;
  font-weight: 700;
  letter-spacing: -0.005em;
  line-height: 1.07;
}

h2 {
  font-size: 48px;
  font-weight: 600;
  letter-spacing: -0.003em;
}

h3 {
  font-size: 28px;
  font-weight: 600;
}

p.intro {
  font-size: 24px;
  font-weight: 400;
  color: var(--text-secondary);
  margin-top: 1rem;
}

p {
  font-size: 17px;
  color: var(--text-secondary);
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.fade-in {
  animation: fadeIn 1s cubic-bezier(0.2, 0.8, 0.2, 1) forwards;
  opacity: 0;
}

.delay-1 { animation-delay: 0.2s; }
.delay-2 { animation-delay: 0.4s; }
.delay-3 { animation-delay: 0.6s; }

/* Navbar */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  z-index: 1000;
  border-bottom: 1px solid rgba(255,255,255,0.1);
  display: flex;
  justify-content: center;
  align-items: center;
}

.nav-container {
  max-width: 980px;
  width: 100%;
  display: flex;
  justify-content: space-between;
  padding: 0 20px;
}

.nav-links {
  display: flex;
  gap: 30px;
  font-size: 12px;
  font-weight: 400;
}

.nav-links a {
  color: #e8e8ed;
  opacity: 0.8;
}

.nav-links a:hover {
  opacity: 1;
  color: #fff;
}

.nav-links a.active {
  color: #fff;
  opacity: 1;
}

/* Layout Utilities */
.container {
  max-width: 980px;
  margin: 0 auto;
  padding: 0 20px;
}

.section {
  padding: 100px 0;
  text-align: center;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 12px 24px;
  border-radius: 980px;
  font-size: 17px;
  font-weight: 600;
  transition: all 0.3s ease;
  margin-top: 20px;
}

.btn-primary {
  background-color: var(--accent-color);
  color: #fff;
}

.btn-primary:hover {
  background-color: #0077ed;
}

.btn-outline {
  background-color: transparent;
  color: var(--accent-color);
  border: 1px solid var(--accent-color);
}

.btn-outline:hover {
  background-color: rgba(41, 151, 255, 0.1);
}

/* Footer */
footer {
  background-color: var(--bg-secondary);
  padding: 40px 0;
  margin-top: auto;
  font-size: 12px;
  color: var(--text-secondary);
  text-align: center;
}

/* Responsive */
@media (max-width: 768px) {
  h1 { font-size: 40px; }
  h2 { font-size: 32px; }
  .nav-container { justify-content: center; }
  .nav-home-link { display: none; } /* Hide logo text in mobile if desired */
}