:root {
  --bg: #0b1322; --panel: #12203a; --ink: #e9f4ef; --sub: #a8c2b8;
  --mint: #7de3b8; --amber: #ffd166; --plum: #b48ce8;
}
* { box-sizing: border-box; margin: 0; }
html { scroll-behavior: smooth; }
body { background: radial-gradient(1200px 700px at 70% -10%, #1a2c47 0%, var(--bg) 55%);
  color: var(--ink); font-family: ui-sans-serif, system-ui, "Segoe UI", Roboto, sans-serif;
  line-height: 1.55; overflow-x: hidden; }
header { position: sticky; top: 0; z-index: 20; display: flex; align-items: center;
  justify-content: space-between; padding: 14px 5vw;
  background: rgba(11, 19, 34, 0.82); backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(125, 227, 184, 0.2); }
.brand { font-weight: 800; letter-spacing: 3px; font-size: 18px; color: var(--mint); }
.brand span { color: var(--amber); }
.btn { display: inline-block; padding: 13px 30px; border-radius: 12px; text-decoration: none;
  font-weight: 700; letter-spacing: 1.5px; color: #08130d;
  background: linear-gradient(120deg, var(--mint), #46c79a); box-shadow: 0 6px 24px rgba(125,227,184,0.35); }
.btn.small { padding: 9px 18px; font-size: 14px; }
.hero { display: grid; grid-template-columns: 1.1fr 1fr; gap: 34px; align-items: center;
  padding: 48px 5vw 40px; }
.hero h1 { font-size: clamp(38px, 6.4vw, 72px); letter-spacing: 4px; line-height: 1.05;
  background: linear-gradient(90deg, var(--mint), #b7f0d6 45%, var(--amber));
  -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero .tagline { margin-top: 14px; font-size: clamp(15px, 1.6vw, 19px); color: var(--sub); max-width: 46ch; }
.hero .cta { margin-top: 26px; display: flex; gap: 14px; align-items: center; flex-wrap: wrap; }
.hero .meta { font-size: 13px; color: var(--sub); }
#hero-preview { width: 100%; aspect-ratio: 16 / 10; border-radius: 18px;
  border: 1px solid rgba(125, 227, 184, 0.25); box-shadow: 0 20px 60px rgba(0, 0, 0, 0.55);
  background: #0e1a2c; }
section { padding: 46px 5vw; max-width: 1200px; margin: 0 auto; }
h2 { font-size: clamp(22px, 3vw, 32px); letter-spacing: 2px; color: var(--mint); margin-bottom: 18px; }
#features { list-style: none; display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 16px; padding: 0; }
#features li { background: linear-gradient(160deg, var(--panel), #0d1930);
  border: 1px solid rgba(125, 227, 184, 0.18); border-radius: 14px; padding: 18px; }
#features b { display: block; color: var(--amber); letter-spacing: 1px; margin-bottom: 6px; }
#features { color: var(--sub); font-size: 15px; }
#controls { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
#controls .goal { background: rgba(255, 209, 102, 0.08); border: 1px solid rgba(255,209,102,0.3);
  border-radius: 14px; padding: 20px; }
kbd { display: inline-block; min-width: 26px; text-align: center; padding: 3px 8px; margin: 2px;
  border-radius: 6px; background: #1c2c48; border: 1px solid #33507e; color: #cfe3ff; font: 13px ui-monospace, monospace; }
#controls ul { padding-left: 20px; color: var(--sub); }
#gallery { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 18px; }
#gallery figure { margin: 0; }
#gallery img { width: 100%; border-radius: 12px; border: 1px solid rgba(180, 140, 232, 0.25);
  display: block; box-shadow: 0 10px 30px rgba(0,0,0,0.45); }
#gallery figcaption { font-size: 13px; color: var(--sub); margin-top: 6px; letter-spacing: 1px; }
footer { text-align: center; padding: 30px 5vw 44px; color: #5f7770; font-size: 13px; }
.night-strip { height: 4px; background: linear-gradient(90deg, var(--mint), var(--amber), var(--plum)); opacity: .7; }
@media (max-width: 820px) {
  .hero { grid-template-columns: 1fr; padding-top: 30px; }
  #controls { grid-template-columns: 1fr; }
}