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

body {
  font-family: "Segoe UI", Arial, sans-serif;
  background: #0f172a;
  color: #e5e7eb;
  line-height: 1.6;
}

/* HERO */
.hero {
  position: relative;
  height: 100vh;
  background: linear-gradient(135deg, #020617, #1e293b);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.overlay {
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at top, rgba(56,189,248,0.2), transparent 60%);
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 700px;
  padding: 20px;
}

.hero h1 {
  font-size: 3.2rem;
  margin-bottom: 20px;
}

.hero p {
  font-size: 1.2rem;
  margin-bottom: 30px;
  color: #cbd5f5;
}

.btn {
  padding: 14px 28px;
  background: #38bdf8;
  color: #020617;
  text-decoration: none;
  border-radius: 30px;
  font-weight: bold;
  transition: all 0.3s ease;
}

.btn:hover {
  background: #0ea5e9;
}

/* SECTIONS */
.section {
  padding: 80px 15%;
  text-align: center;
}

.section h2 {
  font-size: 2.2rem;
  margin-bottom: 25px;
  color: #38bdf8;
}

.section p {
  font-size: 1.1rem;
  max-width: 800px;
  margin: auto;
  color: #d1d5db;
}

.section.dark {
  background: #020617;
}

/* CARDS */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 30px;
  padding: 80px 10%;
  background: #020617;
}

.card {
  background: #020617;
  border: 1px solid #1e293b;
  padding: 30px;
  border-radius: 16px;
  transition: transform 0.3s ease, border 0.3s ease;
}

.card:hover {
  transform: translateY(-10px);
  border-color: #38bdf8;
}

.card h3 {
  margin-bottom: 15px;
  color: #38bdf8;
}

/* TECH LIST */
.tech {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 15px;
}

.tech li {
  background: #020617;
  padding: 12px 20px;
  border-radius: 20px;
  border: 1px solid #1e293b;
}

/* FOOTER */
footer {
  padding: 30px;
  text-align: center;
  background: #020617;
  font-size: 0.9rem;
  color: #94a3b8;
}

/* RESPONSIVE */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 2.4rem;
  }

  .section {
    padding: 60px 8%;
  }
}