:root { --ink:#0a0e14; --ink2:#10151f; --teal:#7fd4c8; --amber:#ffb45e; --text:#c9d3cf; --dim:#8a97a0; }
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--ink); color: var(--text);
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif; }
.hero { position: relative; min-height: 92vh; display: flex; flex-direction: column;
  align-items: center; justify-content: center; text-align: center; padding: 24px 16px;
  background: radial-gradient(ellipse at 50% 30%, #131c26 0%, #0a0e14 65%); overflow: hidden; }
#hero-preview { position: absolute; inset: 0; width: 100%; height: 100%; opacity: 0.55; }
.hero-inner { position: relative; z-index: 2; max-width: 640px; }
h1 { font-size: clamp(42px, 9vw, 88px); margin: 0; letter-spacing: 0.14em; color: #e8f0eb;
  font-weight: 700; text-shadow: 0 0 40px rgba(127, 212, 200, 0.35); }
.tagline { font-size: clamp(15px, 2.6vw, 21px); color: var(--dim); margin: 10px 0 26px;
  letter-spacing: 0.06em; }
.play-btn { display: inline-block; background: linear-gradient(180deg, #1d4a42, #14312c);
  color: #a9e6d8; border: 1px solid #2f6b60; padding: 16px 44px; font-size: 18px;
  letter-spacing: 0.2em; text-decoration: none; border-radius: 4px;
  box-shadow: 0 0 30px rgba(127, 212, 200, 0.25); transition: transform 0.15s, box-shadow 0.15s; }
.play-btn:hover { transform: translateY(-2px); box-shadow: 0 0 44px rgba(127,212,200,0.4); }
.hero .scroll-hint { margin-top: 30px; font-size: 12px; color: var(--dim); letter-spacing: 3px; }
section { max-width: 1060px; margin: 0 auto; padding: 64px 20px; }
h2 { color: #e8f0eb; font-size: 26px; letter-spacing: 0.12em; margin: 0 0 22px; }
h2::after { content: ""; display: block; width: 52px; height: 2px; margin-top: 10px;
  background: linear-gradient(90deg, var(--teal), transparent); }
#features { list-style: none; padding: 0; margin: 0; display: grid; gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
#features li { background: var(--ink2); border: 1px solid #1c2530; border-left: 3px solid var(--teal);
  padding: 16px 18px; border-radius: 4px; line-height: 1.55; font-size: 15px; }
#features b { color: var(--teal); letter-spacing: 0.04em; }
#gallery { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
#gallery img { width: 100%; height: auto; border: 1px solid #1c2530; border-radius: 4px;
  background: #05070c; aspect-ratio: 8/5; }
#controls { display: grid; gap: 10px; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); }
#controls .key { background: var(--ink2); border: 1px solid #1c2530; padding: 12px 14px;
  border-radius: 4px; font-size: 14px; }
#controls .key kbd { background: #1b2430; border: 1px solid #2c3948; border-radius: 4px;
  padding: 2px 8px; font-family: inherit; color: var(--amber); margin-right: 4px; }
#controls .goal { grid-column: 1 / -1; line-height: 1.7; font-size: 15px; color: var(--text); }
footer { text-align: center; color: #53606b; font-size: 13px; padding: 30px 12px 44px;
  border-top: 1px solid #151c26; }
.badge { display: inline-block; font-size: 11px; letter-spacing: 3px; color: var(--amber);
  border: 1px solid #3a3226; padding: 5px 12px; border-radius: 99px; margin-bottom: 18px;
  background: rgba(255, 180, 94, 0.06); }
@media (max-width: 640px) {
  .hero { min-height: 84vh; }
  section { padding: 44px 14px; }
  .play-btn { padding: 14px 32px; }
}