/* === Reset & Global === */
*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'Poppins', sans-serif;
  background: linear-gradient(135deg, #0f0f3f 0%, #000012 100%);
  color: #e0e6f2;
  line-height: 1.6;
  scroll-behavior: smooth;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* === Header === */
.header {
  background: rgba(10, 10, 40, 0.9);
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 999;
  box-shadow: 0 0 15px #3743ffaa;
}

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

.logo {
  font-weight: 700;
  font-size: 1.75rem;
  letter-spacing: 0.1em;
  color: #7fffd4;
  text-shadow: 0 0 8px #7fffd4aa;
}

.nav ul {
  list-style: none;
  display: flex;
  gap: 2rem;
  margin: 0;
  padding: 0;
}

.nav a {
  text-decoration: none;
  color: #a2b3ff;
  font-weight: 600;
  transition: color 0.3s ease;
  padding: 0.5rem 0;
  border-bottom: 2px solid transparent;
}

.nav a:hover,
.nav a:focus {
  color: #7fffd4;
  border-color: #7fffd4;
}

#menu-btn {
  display: none;
  background: none;
  border: none;
  font-size: 2rem;
  color: #7fffd4;
  cursor: pointer;
}

/* === Hero === */
.hero {
  padding: 8rem 0 6rem 0;
  text-align: center;
  background: radial-gradient(circle at center, #09102d 0%, #000012 100%);
  box-shadow: inset 0 0 80px #7fffd4aa;
  border-radius: 15px;
  margin-bottom: 5rem;
}

.hero h2 {
  font-size: 3rem;
  font-weight: 700;
  margin-bottom: 1rem;
  letter-spacing: 0.1em;
  text-shadow: 0 0 15px #7fffd4aa;
}

.hero p {
  font-size: 1.25rem;
  margin-bottom: 2rem;
  color: #b3c7ffcc;
}

.btn-primary {
  background: linear-gradient(135deg, #7fffd4, #3743ff);
  color: #000;
  padding: 0.75rem 2.25rem;
  font-weight: 700;
  border-radius: 50px;
  box-shadow: 0 0 15px #7fffd4aa, 0 0 30px #3743ffbb;
  text-decoration: none;
  transition: box-shadow 0.3s ease, transform 0.3s ease;
}

.btn-primary:hover,
.btn-primary:focus {
  box-shadow: 0 0 30px #7fffd4ff, 0 0 60px #3743ffff;
  transform: scale(1.05);
}

/* === Coins Section === */
.coins-section {
  margin-bottom: 6rem;
}

.coins-section h3 {
  text-align: center;
  font-size: 2.25rem;
  margin-bottom: 3rem;
  color: #7fffd4;
  text-shadow: 0 0 15px #7fffd4bb;
}

.coins-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 2.5rem;
}

.coin-card {
  background: linear-gradient(135deg, #1a1a5c, #0b0b2b);
  border-radius: 15px;
  padding: 2rem 1.5rem;
  box-shadow: 0 0 20px #3743ff66;
  text-align: center;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  cursor: default;
}

.coin-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 0 40px #7fffd4cc;
}

.coin-icon {
  font-size: 3.5rem;
  margin-bottom: 1rem;
  color: #7fffd4;
  text-shadow: 0 0 15px #7fffd4cc;
}

.coin-card h4 {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
  color: #b3e5ff;
}

.coin-card p {
  font-size: 1rem;
  color: #c1d6ffcc;
  line-height: 1.4;
}

/* === Technology Section === */
.technology-section {
  background: #09102d;
  padding: 4rem 1.5rem 6rem 1.5rem;
  border-radius: 15px;
  max-width: 900px;
  margin: 0 auto 6rem auto;
  box-shadow: 0 0 50px #3743ffaa inset;
  text-align: center;
}

.technology-section h3 {
  font-size: 2rem;
  margin-bottom: 1.5rem;
  color: #7fffd4;
  text-shadow: 0 0 15px #7fffd4bb;
}

.technology-section p {
  margin-bottom: 2rem;
  font-size: 1.1rem;
  color: #aac4ffcc;
}

.technology-section ul {
  list-style: none;
  padding: 0;
  display: inline-grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem 3rem;
  color: #9db9ffcc;
  font-weight: 600;
}

.technology-section ul li {
  position: relative;
  padding-left: 1.3rem;
}

.technology-section ul li::before {
  content: "✔";
  position: absolute;
  left: 0;
  color: #7fffd4;
}

/* === Testimonials Section === */
.testimonials-section {
  max-width: 800px;
  margin: 0 auto 6rem auto;
  padding: 2rem 1rem;
  background: #0b0c38cc;
  border-radius: 15px;
  box-shadow: 0 0 40px #3743ffcc inset;
  text-align: center;
  position: relative;
}

.testimonials-section h3 {
  font-size: 2rem;
  margin-bottom: 2rem;
  color: #7fffd4;
  text-shadow: 0 0 20px #7fffd4cc;
}

.testimonial-slider {
  position: relative;
  overflow: hidden;
  height: 130px;
}

.testimonial {
  opacity: 0;
  position: absolute;
  top: 0; left: 0; right: 0;
  padding: 0 2rem;
  transition: opacity 0.6s ease;
  font-style: italic;
  color: #d4e0ffcc;
}

.testimonial.active {
  position: relative;
  opacity: 1;
}

.testimonial span {
  display: block;
  margin-top: 1rem;
  font-weight: 700;
  color: #7fffd4;
}

/* Testimonial Controls */
.testimonial-controls {
  margin-top: 1.5rem;
  display: flex;
  justify-content: center;
  gap: 1.5rem;
}

.testimonial-controls button {
  background: none;
  border: 2px solid #7fffd4;
  color: #7fffd4;
  font-size: 1.8rem;
  padding: 0.2rem 0.8rem;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.3s ease;
}

.testimonial-controls button:hover {
  background: #7fffd4;
  color: #000;
}

/* === Contact Section === */
.contact-section {
  max-width: 700px;
  margin: 0 auto 6rem auto;
  padding: 3rem 1.5rem;
  background: #0a0a2bdd;
  border-radius: 15px;
  box-shadow: 0 0 40px #3743ffbb inset;
}

.contact-section h3 {
  font-size: 2