/* ===== RESET & BASE ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  line-height: 1.65;
  color: #e8edf5;
  background: #0a0e17;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
a { color: inherit; text-decoration: none; transition: color 0.2s, background 0.2s, transform 0.2s; }
img { max-width: 100%; height: auto; }
ul, ol { list-style: none; }

/* ===== HEADER & NAV ===== */
header {
  background: linear-gradient(180deg, #0d1525 0%, #0a0e17 100%);
  border-bottom: 1px solid rgba(0, 212, 255, 0.15);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
}
nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1140px;
  margin: 0 auto;
  padding: 0.9rem 1.5rem;
  flex-wrap: wrap;
  gap: 0.8rem;
}
.logo {
  font-size: 1.45rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  background: linear-gradient(90deg, #00d4ff, #7b5cff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
nav ul {
  display: flex;
  gap: 0.35rem;
  flex-wrap: wrap;
}
nav ul a {
  display: block;
  padding: 0.45rem 0.85rem;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 500;
  color: #a8b4c8;
}
nav ul a:hover {
  color: #fff;
  background: rgba(0, 212, 255, 0.12);
}

/* ===== MAIN ===== */
main {
  flex: 1;
  max-width: 960px;
  width: 100%;
  margin: 0 auto;
  padding: 2rem 1.25rem 3rem;
}

/* ===== HERO ===== */
.hero {
  text-align: center;
  padding: 3rem 1.5rem;
  background: linear-gradient(145deg, #111827 0%, #0d1525 50%, #151b2e 100%);
  border: 1px solid rgba(0, 212, 255, 0.18);
  border-radius: 20px;
  margin-bottom: 2.5rem;
  position: relative;
  overflow: hidden;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
}
.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -30%;
  width: 80%;
  height: 200%;
  background: radial-gradient(circle, rgba(0, 212, 255, 0.08) 0%, transparent 60%);
  pointer-events: none;
}
.hero h1 {
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 1rem;
  background: linear-gradient(90deg, #fff 30%, #00d4ff 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  position: relative;
}
.hero p {
  font-size: 1.05rem;
  color: #9db0c9;
  max-width: 560px;
  margin: 0 auto 1.8rem;
  position: relative;
}

/* ===== BUTTON ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: linear-gradient(135deg, #00d4ff 0%, #0099cc 100%);
  color: #041018;
  padding: 0.9rem 2rem;
  border-radius: 12px;
  font-weight: 700;
  font-size: 1rem;
  box-shadow: 0 6px 24px rgba(0, 212, 255, 0.35);
  position: relative;
  border: none;
  cursor: pointer;
}
.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 32px rgba(0, 212, 255, 0.45);
  color: #041018;
}
.btn:active { transform: translateY(0); }

/* ===== FEATURE CARDS ===== */
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.4rem;
  margin-bottom: 2.5rem;
}
.card {
  background: linear-gradient(165deg, #121a2b 0%, #0e1522 100%);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 16px;
  padding: 1.6rem 1.4rem;
  transition: transform 0.25s, border-color 0.25s, box-shadow 0.25s;
}
.card:hover {
  transform: translateY(-4px);
  border-color: rgba(0, 212, 255, 0.3);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.35);
}
.card h2 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.55rem;
  color: #00d4ff;
}
.card p {
  font-size: 0.95rem;
  color: #8fa3bc;
}

/* ===== CONTENT BLOCK ===== */
.content {
  background: linear-gradient(165deg, #121a2b 0%, #0e1522 100%);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 16px;
  padding: 2rem 1.75rem;
  margin-bottom: 2rem;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
}
.content h2 {
  font-size: 1.3rem;
  font-weight: 700;
  color: #00d4ff;
  margin: 1.8rem 0 0.7rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid rgba(0, 212, 255, 0.15);
}
.content h2:first-child { margin-top: 0; }
.content p {
  color: #b0c0d4;
  margin-bottom: 1rem;
  font-size: 1rem;
}
.content ul, .content ol {
  margin: 0.8rem 0 1.2rem 0.3rem;
}
.content li {
  position: relative;
  padding-left: 1.4rem;
  margin-bottom: 0.55rem;
  color: #b0c0d4;
}
.content ul li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: #00d4ff;
  font-weight: 700;
}
.content ol {
  counter-reset: item;
}
.content ol li {
  counter-increment: item;
}
.content ol li::before {
  content: counter(item) ".";
  position: absolute;
  left: 0;
  color: #00d4ff;
  font-weight: 700;
}
.content strong { color: #e8edf5; }

/* ===== CTA ===== */
.cta {
  text-align: center;
  margin: 2.5rem 0 1rem;
}

/* ===== FOOTER ===== */
footer {
  background: #070b12;
  border-top: 1px solid rgba(0, 212, 255, 0.1);
  color: #6b7c94;
  text-align: center;
  padding: 2rem 1.25rem;
  margin-top: auto;
  font-size: 0.9rem;
}
footer p { margin-bottom: 1rem; }
footer ul {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}
footer a {
  color: #00d4ff;
  font-weight: 500;
}
footer a:hover { color: #7b5cff; text-decoration: underline; }

/* ===== RESPONSIVE ===== */
@media (max-width: 640px) {
  nav { padding: 0.75rem 1rem; }
  .logo { font-size: 1.25rem; }
  nav ul { gap: 0.2rem; }
  nav ul a { padding: 0.4rem 0.65rem; font-size: 0.82rem; }
  main { padding: 1.5rem 1rem 2.5rem; }
  .hero { padding: 2.2rem 1.2rem; border-radius: 14px; }
  .content { padding: 1.5rem 1.2rem; border-radius: 14px; }
  .card { padding: 1.3rem 1.1rem; }
}