:root {
  --bg: #0d1220; --bg2: #121a2c; --card: #172238; --line: #263451; --text: #e8edf7; --dim: #9aa8c2;
  --accent: #3478f6; --copper: #d6803c; --ok: #4fd38c;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--text); font-family: 'Pretendard', 'Malgun Gothic', 'Apple SD Gothic Neo', 'Noto Sans KR', sans-serif; line-height: 1.6; }
a { color: inherit; }
.wrap { max-width: 1180px; margin: 0 auto; padding: 0 24px; }
header.nav { position: sticky; top: 0; z-index: 10; background: rgba(13,18,32,.85); backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); }
header.nav .wrap { display: flex; align-items: center; gap: 22px; height: 64px; }
header.nav .brand { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 19px; text-decoration: none; }
header.nav .brand img { width: 34px; height: 34px; border-radius: 8px; }
header.nav nav { display: flex; gap: 18px; margin-left: auto; font-size: 14.5px; }
header.nav nav a { text-decoration: none; color: var(--dim); }
header.nav nav a:hover { color: var(--text); }
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 12px 20px; border-radius: 10px; font-weight: 700; text-decoration: none; border: 1px solid var(--line); background: var(--card); }
.btn.primary { background: linear-gradient(135deg, #3d84ff, #2a5fd6); border-color: transparent; color: #fff; box-shadow: 0 8px 24px rgba(52,120,246,.35); }
.btn:hover { filter: brightness(1.08); }
.hero { padding: 70px 0 40px; background: radial-gradient(1200px 500px at 70% -10%, rgba(52,120,246,.25), transparent), radial-gradient(800px 400px at 0% 10%, rgba(214,128,60,.18), transparent); }
.hero .grid { display: grid; grid-template-columns: 1fr 1.25fr; gap: 40px; align-items: center; }
.hero h1 { font-size: 46px; line-height: 1.15; margin: 0 0 14px; letter-spacing: -.5px; }
.hero h1 span { background: linear-gradient(90deg, #ffb070, #d6803c); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero p.lead { font-size: 18px; color: var(--dim); margin: 0 0 26px; }
.hero .cta { display: flex; gap: 12px; flex-wrap: wrap; }
.hero .meta { margin-top: 14px; font-size: 13px; color: var(--dim); }
.shot { border-radius: 12px; overflow: hidden; border: 1px solid var(--line); box-shadow: 0 20px 60px rgba(0,0,0,.5); background: #000; }
.shot img { display: block; width: 100%; }
section { padding: 64px 0; }
section h2 { font-size: 30px; margin: 0 0 8px; }
section .sub { color: var(--dim); margin: 0 0 30px; }
.features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.feature { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 22px; }
.feature b { display: block; font-size: 17px; margin-bottom: 6px; }
.feature p { margin: 0; color: var(--dim); font-size: 14.5px; }
.feature .tag { display: inline-block; font-size: 12px; padding: 2px 8px; border-radius: 6px; background: rgba(52,120,246,.18); color: #8db4ff; margin-bottom: 10px; }
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 34px; align-items: center; }
.steps { counter-reset: s; list-style: none; padding: 0; margin: 0; }
.steps li { counter-increment: s; position: relative; padding: 0 0 16px 46px; color: var(--dim); }
.steps li::before { content: counter(s); position: absolute; left: 0; top: -2px; width: 30px; height: 30px; border-radius: 50%; background: var(--accent); color: #fff; font-weight: 800; display: flex; align-items: center; justify-content: center; }
.steps li b { color: var(--text); }
.gallery { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.gallery figure { margin: 0; }
.gallery figcaption { font-size: 13px; color: var(--dim); margin-top: 6px; text-align: center; }
.dl { background: var(--bg2); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.dl .cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.dl .card { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 22px; display: flex; flex-direction: column; gap: 10px; }
.dl .card h3 { margin: 0; }
.dl .card p { margin: 0; color: var(--dim); font-size: 14px; flex: 1; }
table.req { width: 100%; border-collapse: collapse; font-size: 14.5px; }
table.req td { padding: 10px 12px; border-bottom: 1px solid var(--line); }
table.req td:first-child { color: var(--dim); width: 160px; }
footer { padding: 34px 0 50px; color: var(--dim); font-size: 13.5px; }
footer .wrap { display: flex; flex-wrap: wrap; gap: 18px; justify-content: space-between; }
.notes h2 { color: #8db4ff; margin-top: 34px; border-top: 1px solid var(--line); padding-top: 26px; }
.notes h3 { margin-bottom: 4px; }
.notes p, .notes li { color: #cdd6e6; }
.notes code { background: var(--card); padding: 1px 6px; border-radius: 5px; }
.notes .row { color: var(--dim); font-size: 14px; }
@media (max-width: 900px) {
  .hero .grid, .split { grid-template-columns: 1fr; }
  .features, .gallery, .dl .cards { grid-template-columns: 1fr; }
  .hero h1 { font-size: 34px; }
  header.nav nav { display: none; }
}

/* 시연 */
.demo { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; align-items: start; }
.sim { position: relative; background: #0a0f1a; border: 1px solid var(--line); border-radius: 14px; overflow: hidden; }
.sim canvas { display: block; width: 100%; height: 400px; }
.simbar { display: flex; justify-content: space-between; align-items: center; padding: 10px 14px; border-top: 1px solid var(--line); background: var(--bg2); }
.simbar b { color: #8db4ff; } .simbar span { color: var(--dim); font-size: 13px; font-variant-numeric: tabular-nums; }
.simlog { height: 132px; overflow: hidden; padding: 8px 14px 12px; font-family: Consolas, 'D2Coding', monospace; font-size: 12.5px; color: var(--dim); background: var(--bg2); line-height: 1.55; }
.simlog .on { color: var(--text); }
.reel .shot img { aspect-ratio: 1600 / 980; object-fit: cover; transition: opacity .35s; }
.reelcap { display: flex; gap: 10px; align-items: center; margin-top: 10px; font-size: 15px; }
.reelcap b { display: inline-flex; width: 26px; height: 26px; border-radius: 50%; background: var(--accent); color: #fff; align-items: center; justify-content: center; font-size: 13px; }
.reelbar { height: 4px; background: #1d2a44; border-radius: 4px; margin-top: 10px; overflow: hidden; }
.reelbar i { display: block; height: 100%; width: 0; background: linear-gradient(90deg, #3d84ff, #d6803c); }
.reelctl { display: flex; gap: 8px; margin-top: 12px; align-items: center; flex-wrap: wrap; }
.reelctl button { background: var(--card); color: var(--text); border: 1px solid var(--line); border-radius: 8px; padding: 8px 12px; cursor: pointer; font-size: 13px; }
.reelctl .btn { padding: 8px 14px; font-size: 13.5px; }
@media (max-width: 900px) { .demo { grid-template-columns: 1fr; } .sim canvas { height: 300px; } }