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

:root {
  --green: #2ecc71;
  --green-dark: #27ae60;
  --dark: #0d1117;
  --dark2: #161b22;
  --dark3: #21262d;
  --text: #e6edf3;
  --text-muted: #8b949e;
  --radius: 12px;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--dark);
  color: var(--text);
  line-height: 1.6;
}

/* NAV */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 2rem;
  background: rgba(13, 17, 23, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.logo {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--green);
  text-decoration: none;
  letter-spacing: -0.5px;
}

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

nav a.cta-nav {
  background: var(--green);
  color: #000;
  padding: 0.5rem 1.25rem;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9rem;
  transition: background 0.2s;
}

nav a.cta-nav:hover {
  background: var(--green-dark);
}

/* HERO */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 6rem 1.5rem 3rem;
  background: radial-gradient(ellipse 80% 60% at 50% 0%, rgba(46,204,113,0.12) 0%, transparent 70%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%2327ae60' fill-opacity='0.04'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  opacity: 0.5;
}

.hero-content {
  position: relative;
  max-width: 720px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: rgba(46,204,113,0.12);
  border: 1px solid rgba(46,204,113,0.3);
  color: var(--green);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.35rem 0.9rem;
  border-radius: 100px;
  margin-bottom: 1.5rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.hero h1 {
  font-size: clamp(2.2rem, 6vw, 4rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -1.5px;
  margin-bottom: 1.25rem;
}

.hero h1 .highlight {
  color: var(--green);
}

.hero p {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  color: var(--text-muted);
  max-width: 540px;
  margin: 0 auto 2.5rem;
}

.cta-btn {
  display: inline-block;
  background: var(--green);
  color: #000;
  padding: 0.9rem 2.25rem;
  border-radius: 10px;
  text-decoration: none;
  font-weight: 700;
  font-size: 1.05rem;
  transition: transform 0.15s, background 0.2s, box-shadow 0.2s;
  box-shadow: 0 0 32px rgba(46,204,113,0.25);
}

.cta-btn:hover {
  background: var(--green-dark);
  transform: translateY(-2px);
  box-shadow: 0 0 48px rgba(46,204,113,0.35);
}

/* FEATURES */
.features {
  padding: 5rem 1.5rem;
  background: var(--dark2);
}

.section-label {
  text-align: center;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--green);
  margin-bottom: 0.75rem;
}

.section-title {
  text-align: center;
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 800;
  letter-spacing: -0.75px;
  margin-bottom: 3rem;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
  max-width: 960px;
  margin: 0 auto;
}

.card {
  background: var(--dark3);
  border: 1px solid rgba(255,255,255,0.07);
  border-radius: var(--radius);
  padding: 2rem 1.5rem;
  transition: border-color 0.2s, transform 0.2s;
}

.card:hover {
  border-color: rgba(46,204,113,0.35);
  transform: translateY(-4px);
}

.card-icon {
  font-size: 2rem;
  margin-bottom: 1rem;
  display: block;
}

.card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.card p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* CTA SECTION */
.cta-section {
  padding: 5rem 1.5rem;
  text-align: center;
  background: var(--dark);
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 300px;
  background: radial-gradient(ellipse at center, rgba(46,204,113,0.1) 0%, transparent 70%);
  pointer-events: none;
}

.cta-section h2 {
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 800;
  letter-spacing: -0.75px;
  margin-bottom: 1rem;
}

.cta-section p {
  color: var(--text-muted);
  font-size: 1.05rem;
  margin-bottom: 2rem;
}

/* FOOTER */
footer {
  padding: 1.5rem;
  text-align: center;
  background: var(--dark2);
  border-top: 1px solid rgba(255,255,255,0.06);
  color: var(--text-muted);
  font-size: 0.85rem;
}

footer a {
  color: var(--green);
  text-decoration: none;
}

/* RESPONSIVE */
@media (max-width: 600px) {
  nav {
    padding: 0.85rem 1.25rem;
  }

  .grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 420px) {
  .grid {
    grid-template-columns: 1fr;
  }
}