:root {
  --primary-gradient: linear-gradient(135deg, #667eea, #764ba2);
  --text-dark: #1a1a1a;
  --text-light: #ffffff;
  --bg-light: #f4f4f6;
  --font-sans: 'Inter', sans-serif;
}

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

body {
  font-family: var(--font-sans);
  color: var(--text-dark);
  background: var(--bg-light);
  line-height: 1.6;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  width: 100%;
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(10px);
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
  z-index: 100;
}
.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 0;
}
.logo {
  font-size: 1.5rem;
  font-weight: 700;
  text-decoration: none;
  color: var(--text-dark);
}
.logo span {
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  color: transparent;
}

.site-nav a {
  margin-left: 1.5rem;
  text-decoration: none;
  color: var(--text-dark);
  font-weight: 600;
  transition: color 0.3s;
}
.site-nav a:hover {
  color: #667eea;
}

.btn-outline {
  padding: 0.5rem 1rem;
  border: 2px solid #667eea;
  border-radius: 4px;
  color: #667eea;
  transition: background 0.3s, color 0.3s;
}
.btn-outline:hover {
  background: #667eea;
  color: white;
}

/* Hero */
.hero {
  background: var(--primary-gradient);
  color: var(--text-light);
  text-align: center;
  padding: 6rem 0 4rem;
}
.hero-title {
  font-size: 3.5rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}
.hero-subtitle {
  font-size: 1.5rem;
  font-weight: 300;
  margin-bottom: 1.5rem;
}
.hero-text {
  font-weight: 400;
  margin-bottom: 2rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.signup-form {
  display: inline-flex;
  border-radius: 50px;
  overflow: hidden;
  box-shadow: 0 4px 16px rgba(0,0,0,0.2);
}
.signup-form input[type="email"] {
  padding: 1rem 1.25rem;
  border: none;
  font-size: 1rem;
  width: 260px;
}
.btn-primary {
  background: #ffffff;
  color: var(--primary-gradient);
  font-weight: 600;
  padding: 1rem 1.5rem;
  border: none;
  cursor: pointer;
  transition: background 0.3s;
}
.btn-primary:hover {
  background: rgba(255,255,255,0.9);
}

/* Features */
.features {
  padding: 4rem 0;
}
.section-title {
  text-align: center;
  font-size: 2.5rem;
  margin-bottom: 2rem;
}
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
}
.feature-card {
  background: rgba(255,255,255,0.75);
  backdrop-filter: blur(10px);
  border-radius: 16px;
  padding: 2rem;
  box-shadow: 0 8px 32px rgba(0,0,0,0.1);
  text-align: center;
  transition: transform 0.3s, box-shadow 0.3s;
}
.feature-card h3 {
  font-size: 1.25rem;
  color: #764ba2;
  margin-bottom: 0.75rem;
}
.feature-card p {
  font-size: 1rem;
  color: #333;
}
.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 12px 48px rgba(0,0,0,0.15);
}

/* Footer */
.site-footer {
  background: #1a1a1a;
  color: #777;
  text-align: center;
  padding: 2rem 0;
  margin-top: 4rem;
}
.footer-container p {
  margin: 0;
}