:root {
  --primary: #1e90ff;
  --secondary: #f5f6fa;
  --accent: #ff4b2b;
  --text: #222;
  --radius: 0.8rem;
  --shadow: 0 4px 24px rgba(30, 144, 255, 0.09);
}

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

html {
  font-size: 18px;
  font-family: 'Segoe UI', 'Roboto', Arial, sans-serif;
  color: var(--text);
  background: var(--secondary);
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  background: linear-gradient(120deg, var(--primary) 60%, var(--accent) 100%);
  color: #fff;
  box-shadow: var(--shadow);
}

nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.5rem 3vw;
  max-width: 1200px;
  margin: 0 auto;
}

nav .logo {
  font-size: 1.6rem;
  font-weight: bold;
  text-decoration: none;
  color: #fff;
  letter-spacing: 2px;
}

nav ul {
  display: flex;
  list-style: none;
  gap: 2rem;
}

nav ul li a {
  color: #fff;
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s;
}

nav ul li a:hover,
nav ul li a:focus {
  color: var(--secondary);
}

.hero {
  text-align: center;
  padding: 5rem 3vw 4rem 3vw;
  max-width: 800px;
  margin: 0 auto;
}

.hero h1 {
  font-size: 2.5rem;
  margin-bottom: 1.1rem;
  font-weight: 700;
}

.hero p {
  font-size: 1.2rem;
  margin-bottom: 2rem;
  color: #f5f5f8;
}

.cta-btn {
  display: inline-block;
  padding: 0.9rem 2.3rem;
  background: var(--accent);
  color: #fff;
  border-radius: var(--radius);
  font-size: 1.1rem;
  font-weight: bold;
  box-shadow: 0 2px 12px rgba(255,75,43,0.09);
  text-decoration: none;
  transition: background 0.25s;
}

.cta-btn:hover,
.cta-btn:focus {
  background: #e03e19;
}

main {
  flex: 1;
  max-width: 1000px;
  margin: 2rem auto 0 auto;
  padding: 0 3vw;
}

section {
  margin-bottom: 3rem;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}

.features-grid div {
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 2rem 1.2rem;
  text-align: center;
}

.features-grid h3 {
  margin-bottom: 0.8rem;
  color: var(--primary);
}

#about {
  text-align: center;
  background: #fff;
  box-shadow: var(--shadow);
  border-radius: var(--radius);
  padding: 2.5rem 1.5rem;
}

.cta-section {
  text-align: center;
  background: var(--primary);
  color: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 2rem 1.5rem;
}

.cta-section .cta-btn {
  margin-top: 1rem;
}

footer {
  background: #222;
  color: #fff;
  text-align: center;
  padding: 1.3rem 0;
  font-size: 1rem;
  margin-top: 3rem;
}

/* Responsive Design */
@media (max-width: 700px) {
  nav {
    flex-direction: column;
    gap: 1rem;
  }
  .hero {
    padding: 3rem 1vw 2rem 1vw;
  }
  main {
    padding: 0 1vw;
  }
  .features-grid {
    gap: 1rem;
  }
}