:root {
  --ink: #0a1220; --ink2: #101b2e; --panel: #16283c;
  --teal: #35e0ff; --mint: #7dfcbc; --amber: #ffb347;
  --text: #d7e6f2; --dim: #94adc4;
}
* { box-sizing: border-box; margin: 0; }
html { scroll-behavior: smooth; }
body {
  background: radial-gradient(1200px 700px at 75% -10%, #1b3050 0%, var(--ink) 55%);
  color: var(--text);
  font-family: "Avenir Next", "Segoe UI", system-ui, sans-serif;
  line-height: 1.6; overflow-x: hidden;
}
h1, h2, h3 { line-height: 1.15; }
#top {
  position: sticky; top: 0; z-index: 9; display: flex; align-items: center;
  justify-content: space-between; padding: 12px 20px;
  background: rgba(10, 18, 32, 0.82); backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(53, 224, 255, 0.22);
}
.logo { font-weight: 800; letter-spacing: 0.22em; font-size: 14px; color: var(--mint); }
.mini-btn {
  color: #06131f; background: linear-gradient(120deg, var(--mint), var(--teal));
  text-decoration: none; font-weight: 700; font-size: 13px; letter-spacing: 0.1em;
  padding: 8px 18px; border-radius: 8px;
}
main { max-width: 1100px; margin: 0 auto; padding: 0 20px 40px; }
#hero { display: flex; gap: 34px; align-items: center; padding: 44px 0 30px; flex-wrap: wrap; }
#hero-copy { flex: 1 1 380px; min-width: 280px; }
#hero h1 {
  font-size: clamp(38px, 7vw, 72px); letter-spacing: 0.14em; font-weight: 800;
  background: linear-gradient(100deg, var(--mint), var(--teal) 60%, #9ecbff);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.tagline { margin: 12px 0 22px; font-size: clamp(16px, 2.2vw, 20px); color: var(--dim); max-width: 34ch; }
.big-btn {
  display: inline-block; text-decoration: none; font: inherit; font-weight: 800;
  letter-spacing: 0.12em; font-size: 16px; color: #06131f;
  background: linear-gradient(120deg, var(--mint), var(--teal));
  padding: 15px 32px; border-radius: 12px;
  box-shadow: 0 8px 30px rgba(53, 224, 255, 0.35);
}
.big-btn:hover { filter: brightness(1.12); transform: translateY(-1px); }
.fineprint { margin-top: 12px; font-size: 12.5px; color: var(--dim); letter-spacing: 0.08em; }
#hero-preview {
  flex: 1 1 420px; min-width: 280px; max-width: 640px; aspect-ratio: 640/420;
  width: 100%; height: auto; border-radius: 16px;
  border: 1px solid rgba(53, 224, 255, 0.3);
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.55);
  background: var(--ink);
}
section { padding: 34px 0; }
h2 {
  font-size: clamp(22px, 3.4vw, 32px); letter-spacing: 0.1em; margin-bottom: 20px;
  color: var(--teal);
}
#gallery { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; }
#gallery img {
  width: 100%; height: auto; border-radius: 12px; display: block;
  border: 1px solid rgba(125, 252, 188, 0.25);
  box-shadow: 0 12px 34px rgba(0, 0, 0, 0.45);
  background: var(--ink2);
}
#features { list-style: none; padding: 0; display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 14px; }
#features li {
  background: linear-gradient(160deg, rgba(34, 58, 88, 0.55), rgba(16, 27, 46, 0.7));
  border: 1px solid rgba(53, 224, 255, 0.18); border-left: 3px solid var(--amber);
  border-radius: 12px; padding: 16px 18px; font-size: 14.5px; color: var(--dim);
}
#features b { display: block; color: var(--text); font-size: 16px; margin-bottom: 4px; letter-spacing: 0.04em; }
#controls {
  background: linear-gradient(160deg, rgba(34, 58, 88, 0.5), rgba(16, 27, 46, 0.75));
  border: 1px solid rgba(53, 224, 255, 0.18); border-radius: 16px; padding: 26px 30px;
}
#controls h3 { color: var(--amber); font-size: 15px; letter-spacing: 0.16em;
  text-transform: uppercase; margin: 16px 0 8px; }
#controls h3:first-child { margin-top: 0; }
#controls p, #controls li { color: var(--dim); font-size: 15px; }
#controls ul { padding-left: 22px; }
#controls em { color: var(--mint); font-style: normal; }
kbd {
  background: #22344a; border: 1px solid #35506c; border-bottom-width: 3px;
  border-radius: 6px; padding: 2px 8px; font-size: 12.5px; color: var(--teal);
}
footer {
  text-align: center; padding: 36px 20px 56px; border-top: 1px solid rgba(53, 224, 255, 0.15);
  color: var(--dim); font-size: 13.5px;
}
footer .big-btn { margin-top: 18px; }
@media (max-width: 420px) {
  #hero { padding-top: 26px; }
  .tagline { max-width: none; }
  #controls { padding: 18px; }
}