* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: "Avenir Next", "Segoe UI", system-ui, sans-serif;
  color: #cfe9f4; background:
    radial-gradient(1200px 700px at 70% -10%, #0b3247 0%, transparent 60%),
    radial-gradient(900px 600px at 10% 30%, #07263a 0%, transparent 55%),
    linear-gradient(180deg, #041725 0%, #02101a 100%);
  min-height: 100vh;
}
.topbar { display: flex; align-items: center; justify-content: space-between;
  padding: 14px 22px; position: sticky; top: 0; z-index: 5;
  background: rgba(3, 16, 26, 0.8); border-bottom: 1px solid rgba(80,200,255,.15); }
.logo { letter-spacing: 4px; font-weight: 700; color: #7fe7ff; text-shadow: 0 0 14px rgba(80,220,255,.6); font-size: 14px; }
.btn-small { color: #04222e; background: linear-gradient(180deg,#66ffe0,#21c7a8); text-decoration: none;
  padding: 8px 18px; border-radius: 20px; font-size: 13px; letter-spacing: 2px; font-weight: 700; }

.hero { position: relative; height: 68vh; min-height: 420px; display: flex; align-items: flex-end; overflow: hidden; }
#hero-preview { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }
.hero::after { content: ""; position: absolute; inset: 0; pointer-events: none;
  background: linear-gradient(180deg, rgba(2,16,26,0.15) 0%, rgba(2,16,26,0.12) 45%, rgba(2,16,26,0.86) 100%); }
.hero-text { z-index: 2; position: relative; padding: 0 8vw 56px; max-width: 720px; }
h1 { font-size: clamp(40px, 8vw, 84px); letter-spacing: 6px; line-height: 1.02;
  color: #eafff8; text-shadow: 0 0 30px rgba(60,255,210,.45), 0 2px 0 rgba(0,0,0,.5); }
.tagline { margin: 12px 0 26px; font-size: clamp(15px, 2.4vw, 21px); color: #9fd8e8; max-width: 520px; }
.btn-play { display: inline-block; text-decoration: none; font-size: 20px; font-weight: 700;
  letter-spacing: 3px; color: #04222e; background: linear-gradient(180deg, #7dffe8, #1fbfa2);
  padding: 16px 44px; border-radius: 44px; box-shadow: 0 0 34px rgba(50,255,200,.45), 0 6px 20px rgba(0,0,0,.4); }
.btn-play:active { transform: translateY(2px); }

main { max-width: 1060px; margin: 0 auto; padding: 20px 22px 40px; }
.block { margin: 46px 0; }
h2 { font-size: clamp(20px, 3.4vw, 30px); letter-spacing: 4px; color: #8fe9ff; margin-bottom: 18px;
  text-shadow: 0 0 16px rgba(80,220,255,.35); }
.lede { font-size: clamp(15px, 2.2vw, 19px); line-height: 1.8; color: #b9d9e6; max-width: 760px; }

#gallery { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 14px; }
#gallery img { width: 100%; aspect-ratio: 8/5; border-radius: 12px; display: block;
  border: 1px solid rgba(90,220,255,.25); box-shadow: 0 8px 26px rgba(0,0,0,.5); }
.gal-note { grid-column: 1 / -1; font-size: 12px; color: #6f93a4; letter-spacing: 1px; }

#features { list-style: none; display: grid; grid-template-columns: 1fr 1fr; gap: 12px 26px; }
#features li { padding: 12px 16px; border-radius: 12px; font-size: 15px; line-height: 1.5;
  background: rgba(10, 40, 60, 0.5); border: 1px solid rgba(90,220,255,.18); }

#controls { font-size: 15px; line-height: 1.8; color: #b9d9e6; max-width: 780px; }
#controls p { margin-bottom: 12px; }
#controls b { color: #7fffd4; }
.ctrl-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-bottom: 16px; }
.ctrl-grid div { background: rgba(10,40,60,.5); border: 1px solid rgba(90,220,255,.18);
  border-radius: 10px; padding: 10px 12px; font-size: 13px; }
.ctrl-grid b { display: block; font-size: 15px; margin-bottom: 2px; }

.cta { text-align: center; padding: 30px 0 10px; }
footer { text-align: center; padding: 34px 16px 46px; color: #55788c; font-size: 12px; letter-spacing: 1px; }

@media (max-width: 640px) {
  .hero { height: 58vh; min-height: 360px; }
  .hero-text { z-index: 2; padding: 0 6vw 30px; }
  #features, .ctrl-grid { grid-template-columns: 1fr; }
  .btn-play { font-size: 17px; padding: 14px 34px; }
}