@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

:root {
  --bg-color: #0f172a; /* Deep slate dark mode */
  --surface-color: rgba(30, 41, 59, 0.7); /* Glassmorphic surface */
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --accent-color: #3b82f6; /* Vibrant blue */
  --accent-glow: rgba(59, 130, 246, 0.5);
  --accent-hover: #2563eb;
  --gradient-primary: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
  --border-color: rgba(255, 255, 255, 0.1);
  --glass-blur: blur(12px);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

/* Background Gradients */
.bg-glow {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
}

.bg-glow::before,
.bg-glow::after {
  content: '';
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0.5;
}

.bg-glow::before {
  top: -10%;
  left: -10%;
  width: 50vw;
  height: 50vw;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.15) 0%, rgba(15, 23, 42, 0) 70%);
}

.bg-glow::after {
  bottom: -10%;
  right: -10%;
  width: 60vw;
  height: 60vw;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.15) 0%, rgba(15, 23, 42, 0) 70%);
}

/* Typography */
h1, h2, h3, h4 {
  font-weight: 700;
  line-height: 1.2;
}

h1 {
  font-size: clamp(2.5rem, 5vw, 4.5rem);
  letter-spacing: -0.02em;
  margin-bottom: 1.5rem;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  display: inline-block;
}

h2 {
  font-size: clamp(2rem, 3vw, 2.5rem);
  margin-bottom: 1rem;
}

p {
  color: var(--text-secondary);
  font-size: 1.125rem;
  margin-bottom: 1.5rem;
}

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

a:hover {
  color: var(--accent-color);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.875rem 1.75rem;
  border-radius: 9999px;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  outline: none;
  text-decoration: none;
}

.btn-primary {
  background: var(--gradient-primary);
  color: #fff;
  box-shadow: 0 4px 14px 0 var(--accent-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px 0 var(--accent-glow);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  backdrop-filter: var(--glass-blur);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  transform: translateY(-2px);
}

/* Header */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 1.5rem 0;
  transition: var(--transition);
  border-bottom: 1px solid transparent;
}

header.scrolled {
  background: var(--surface-color);
  backdrop-filter: var(--glass-blur);
  padding: 1rem 0;
  border-bottom: 1px solid var(--border-color);
}

.container {
  width: 90%;
  max-width: 1200px;
  margin: 0 auto;
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo span {
  color: var(--accent-color);
}

.nav-menu {
  display: flex;
  gap: 2rem;
  align-items: center;
}

.nav-link {
  font-weight: 500;
  position: relative;
}

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

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

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
}

/* Hero Section */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 6rem;
  position: relative;
}

.hero-content {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

.hero p {
  font-size: clamp(1.125rem, 2vw, 1.25rem);
  margin-bottom: 2.5rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero-btns {
  display: flex;
  gap: 1rem;
  justify-content: center;
}

/* Features Section */
.features {
  padding: 6rem 0;
}

.section-title {
  text-align: center;
  margin-bottom: 4rem;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.feature-card {
  background: var(--surface-color);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border-color);
  border-radius: 24px;
  padding: 2.5rem;
  transition: var(--transition);
}

.feature-card:hover {
  transform: translateY(-10px);
  border-color: rgba(255, 255, 255, 0.2);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.feature-icon {
  width: 60px;
  height: 60px;
  background: rgba(59, 130, 246, 0.1);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  color: var(--accent-color);
  margin-bottom: 1.5rem;
}

.feature-card h3 {
  margin-bottom: 1rem;
  font-size: 1.5rem;
}

.feature-card p {
  font-size: 1rem;
  margin-bottom: 0;
}

/* Content Pages (Privacy, Terms) */
.page-header {
  padding: 10rem 0 4rem;
  text-align: center;
  background: linear-gradient(180deg, rgba(15, 23, 42, 0) 0%, var(--surface-color) 100%);
  border-bottom: 1px solid var(--border-color);
}

.page-header h1 {
  font-size: clamp(2rem, 4vw, 3.5rem);
  margin-bottom: 1rem;
}

.page-content {
  padding: 4rem 0 8rem;
  max-width: 800px;
  margin: 0 auto;
}

.content-block {
  background: var(--surface-color);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border-color);
  border-radius: 24px;
  padding: 3rem;
}

.content-block h2 {
  font-size: 1.75rem;
  margin-top: 2rem;
  color: var(--text-primary);
}

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

.content-block p, .content-block ul {
  margin-bottom: 1.5rem;
  color: var(--text-secondary);
}

.content-block ul {
  padding-left: 1.5rem;
}

.content-block li {
  margin-bottom: 0.5rem;
}

/* Footer */
footer {
  border-top: 1px solid var(--border-color);
  padding: 4rem 0 2rem;
  background: rgba(15, 23, 42, 0.8);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 2rem;
  margin-bottom: 3rem;
}

.footer-brand {
  max-width: 300px;
}

.footer-brand p {
  margin-top: 1rem;
  font-size: 0.875rem;
}

.footer-links {
  display: flex;
  gap: 4rem;
}

.footer-col h4 {
  color: var(--text-primary);
  margin-bottom: 1.5rem;
  font-size: 1.125rem;
}

.footer-col ul {
  list-style: none;
}

.footer-col li {
  margin-bottom: 0.75rem;
}

.footer-col a {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

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

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 0.875rem;
}

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

.animate-on-scroll.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Responsive */
@media (max-width: 768px) {
  .nav-menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--surface-color);
    backdrop-filter: var(--glass-blur);
    border-bottom: 1px solid var(--border-color);
    flex-direction: column;
    padding: 2rem;
    clip-path: circle(0% at 100% 0);
    transition: clip-path 0.4s ease-out;
  }
  
  .nav-menu.active {
    clip-path: circle(150% at 100% 0);
  }
  
  .mobile-menu-btn {
    display: block;
  }
  
  .hero-btns {
    flex-direction: column;
  }
  
  .footer-inner {
    flex-direction: column;
  }
  
  .footer-links {
    flex-direction: column;
    gap: 2rem;
  }
  
  .content-block {
    padding: 2rem 1.5rem;
  }
}