:root {
  --bg: #050b18;
  --bg-2: #08122a;
  --panel: rgba(13, 27, 52, 0.72);
  --panel-solid: #0c1a33;
  --line: rgba(120, 170, 230, 0.16);
  --line-strong: rgba(120, 190, 255, 0.32);
  --text: #e8f1ff;
  --muted: #93a7c4;
  --cyan: #22d3ee;
  --blue: #3b82f6;
  --accent: linear-gradient(135deg, #22d3ee 0%, #3b82f6 100%);
  --warm: #fde7c4;
  --radius: 18px;
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.45);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  background-image:
    radial-gradient(900px 500px at 85% -10%, rgba(34, 211, 238, 0.14), transparent 60%),
    radial-gradient(800px 600px at -10% 20%, rgba(59, 130, 246, 0.12), transparent 60%);
  background-repeat: no-repeat;
  color: var(--text);
  font-family: "Be Vietnam Pro", system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.65;
  overflow-x: hidden;
}
a { color: var(--cyan); text-decoration: none; }
a:hover { text-decoration: underline; }
img, video { max-width: 100%; display: block; }
.wrap { width: 100%; max-width: 1140px; margin: 0 auto; padding: 0 16px; }
@media (min-width: 720px) { .wrap { padding: 0 28px; } }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 10;
  background: rgba(5, 11, 24, 0.82);
  backdrop-filter: saturate(140%) blur(12px);
  -webkit-backdrop-filter: saturate(140%) blur(12px);
  border-bottom: 1px solid var(--line);
}
.site-header .wrap { display: flex; align-items: center; gap: 20px; height: 66px; }
.brand { display: flex; align-items: center; gap: 12px; color: var(--text); }
.brand:hover { text-decoration: none; }
.logo {
  width: 40px; height: 40px; border-radius: 11px; flex: none;
  display: grid; place-items: center;
  background: var(--accent); color: #04101f; font-weight: 800; font-size: 15px; letter-spacing: 0.5px;
}
.brand b { display: block; font-size: 14px; letter-spacing: 1.2px; text-transform: uppercase; line-height: 1.2; }
.brand small { display: block; color: var(--muted); font-size: 12px; line-height: 1.2; }
.nav { display: none; gap: 26px; margin-left: auto; }
.nav a { color: var(--muted); font-size: 14px; font-weight: 500; }
.nav a:hover { color: var(--text); text-decoration: none; }
.header-cta { margin-left: auto; }
@media (min-width: 900px) {
  .nav { display: flex; }
  .header-cta { margin-left: 8px; }
}

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  min-height: 48px; padding: 12px 22px; border-radius: 12px;
  font-weight: 700; font-size: 15px; line-height: 1.2; text-align: center;
  border: 1px solid transparent; cursor: pointer; transition: transform .15s ease, box-shadow .15s ease, background .15s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary { background: var(--accent); color: #04101f; box-shadow: 0 10px 30px rgba(34, 211, 238, 0.25); }
.btn-primary:hover { box-shadow: 0 14px 36px rgba(34, 211, 238, 0.35); }
.btn-ghost { background: rgba(255, 255, 255, 0.04); color: var(--text); border-color: var(--line-strong); }
.btn-ghost:hover { background: rgba(255, 255, 255, 0.08); }
.btn-small { min-height: 40px; padding: 9px 16px; font-size: 14px; border-radius: 10px; }
.btn svg { width: 18px; height: 18px; flex: none; }

/* Hero */
.hero { padding: 56px 0 40px; }
.hero .wrap { display: grid; gap: 40px; align-items: center; }
@media (min-width: 980px) {
  .hero { padding: 84px 0 64px; }
  .hero .wrap { grid-template-columns: 1fr 1.08fr; gap: 56px; }
}
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  color: var(--cyan); font-size: 12px; font-weight: 700; letter-spacing: 2px; text-transform: uppercase;
}
.eyebrow .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--cyan); box-shadow: 0 0 12px var(--cyan); }
h1 {
  margin: 14px 0 18px; font-size: clamp(32px, 6vw, 54px); line-height: 1.12; font-weight: 800; letter-spacing: -0.8px;
}
h1 .grad { background: var(--accent); -webkit-background-clip: text; background-clip: text; color: transparent; }
.lead { color: var(--muted); font-size: 18px; margin: 0 0 28px; max-width: 560px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }
.hero-actions .btn { flex: 1 1 220px; }
@media (min-width: 560px) { .hero-actions .btn { flex: 0 0 auto; } }
.hero-meta { display: flex; flex-wrap: wrap; gap: 8px 18px; margin-top: 22px; color: var(--muted); font-size: 14px; }
.hero-meta span { display: inline-flex; align-items: center; gap: 7px; }
.hero-meta svg { width: 16px; height: 16px; color: var(--cyan); }
.video-card {
  position: relative; border-radius: 20px; padding: 10px;
  background: linear-gradient(160deg, rgba(34, 211, 238, 0.35), rgba(59, 130, 246, 0.12) 40%, rgba(255, 255, 255, 0.04));
  box-shadow: var(--shadow);
}
.video-card video { width: 100%; aspect-ratio: 16 / 9; border-radius: 13px; background: var(--warm); object-fit: cover; }
.video-caption { margin: 12px 4px 2px; color: var(--muted); font-size: 13px; }

/* Sections */
section { scroll-margin-top: 80px; }
.section { padding: 64px 0; }
.section-head { max-width: 680px; margin-bottom: 36px; }
.section-head h2 { margin: 10px 0 12px; font-size: clamp(26px, 4vw, 38px); line-height: 1.2; letter-spacing: -0.4px; }
.section-head p { margin: 0; color: var(--muted); font-size: 17px; }
.center { text-align: center; margin-left: auto; margin-right: auto; }

.grid { display: grid; gap: 18px; }
@media (min-width: 680px) { .grid-3, .grid-2 { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1000px) { .grid-3 { grid-template-columns: repeat(3, 1fr); } }

.card {
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px; min-width: 0;
}
.card h3 { margin: 14px 0 8px; font-size: 18px; line-height: 1.35; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }
.icon {
  width: 44px; height: 44px; border-radius: 12px; display: grid; place-items: center;
  background: rgba(34, 211, 238, 0.1); border: 1px solid rgba(34, 211, 238, 0.25); color: var(--cyan);
}
.icon svg { width: 22px; height: 22px; }

/* Steps */
.steps { counter-reset: step; }
.step { position: relative; padding-top: 28px; }
.step::before {
  counter-increment: step; content: counter(step);
  position: absolute; top: -18px; left: 24px;
  width: 38px; height: 38px; border-radius: 50%; display: grid; place-items: center;
  background: var(--accent); color: #04101f; font-weight: 800; font-size: 16px;
  box-shadow: 0 6px 18px rgba(34, 211, 238, 0.35);
}
.steps.grid { row-gap: 34px; }
.step .note { margin-top: 10px; font-size: 14px; color: var(--muted); }

/* Downloads */
.downloads { background: linear-gradient(180deg, transparent, rgba(12, 26, 51, 0.55) 30%, rgba(12, 26, 51, 0.55) 70%, transparent); }
.dl-card { display: flex; flex-direction: column; gap: 14px; padding: 28px; border-color: var(--line-strong); }
.dl-top { display: flex; align-items: center; gap: 14px; }
.dl-top .icon { width: 52px; height: 52px; border-radius: 14px; }
.dl-top h3 { margin: 0; font-size: 20px; }
.dl-top .tag { display: inline-block; margin-top: 2px; color: var(--muted); font-size: 13px; }
.dl-card > p { margin: 0; color: var(--muted); font-size: 15px; }
.facts { display: flex; flex-wrap: wrap; gap: 8px; margin: 0; padding: 0; list-style: none; }
.facts li {
  font-size: 13px; color: var(--text); padding: 5px 11px; border-radius: 999px;
  background: rgba(255, 255, 255, 0.05); border: 1px solid var(--line);
}
.dl-card .btn { width: 100%; margin-top: auto; }
details.hash { font-size: 13px; color: var(--muted); }
details.hash summary { cursor: pointer; }
details.hash code {
  display: block; margin-top: 8px; padding: 10px 12px; border-radius: 10px;
  background: rgba(0, 0, 0, 0.35); border: 1px solid var(--line);
  color: var(--text); font-size: 12px; word-break: break-all; font-family: Consolas, "SFMono-Regular", Menlo, monospace;
}
.notice {
  display: flex; gap: 14px; align-items: flex-start; margin-top: 22px; padding: 18px 20px;
  border-radius: 14px; background: rgba(250, 204, 21, 0.07); border: 1px solid rgba(250, 204, 21, 0.28);
}
.notice svg { width: 22px; height: 22px; flex: none; color: #facc15; margin-top: 2px; }
.notice p { margin: 0; font-size: 15px; color: #f5e6b8; }
.notice b { color: #fff3cc; }
.reqs { margin: 0; padding: 0; list-style: none; display: grid; gap: 10px; }
.reqs li { display: flex; gap: 10px; color: var(--muted); font-size: 15px; }
.reqs li::before { content: ""; flex: none; width: 8px; height: 8px; margin-top: 9px; border-radius: 50%; background: var(--cyan); }
.reqs b { color: var(--text); font-weight: 600; }

/* FAQ */
.faq { display: grid; gap: 12px; max-width: 820px; margin: 0 auto; }
.faq details {
  background: var(--panel); border: 1px solid var(--line); border-radius: 14px; padding: 4px 20px;
}
.faq summary {
  cursor: pointer; list-style: none; padding: 16px 28px 16px 0; position: relative;
  font-weight: 600; font-size: 16px;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+"; position: absolute; right: 0; top: 50%; transform: translateY(-50%);
  color: var(--cyan); font-size: 22px; font-weight: 400;
}
.faq details[open] summary::after { content: "–"; }
.faq details p { margin: 0 0 18px; color: var(--muted); font-size: 15px; }

/* Contact */
.contact-band {
  display: grid; gap: 24px; align-items: center; padding: 36px 28px; border-radius: 22px;
  background:
    radial-gradient(600px 300px at 100% 0%, rgba(34, 211, 238, 0.18), transparent 60%),
    var(--panel-solid);
  border: 1px solid var(--line-strong);
}
@media (min-width: 860px) { .contact-band { grid-template-columns: 1.3fr 1fr; padding: 44px 48px; } }
.contact-band h2 { margin: 8px 0 10px; font-size: clamp(24px, 3.6vw, 34px); line-height: 1.2; }
.contact-band p { margin: 0; color: var(--muted); }
.contact-actions { display: grid; gap: 12px; }
.phone { font-size: 15px; color: var(--muted); text-align: center; }
.phone b { color: var(--text); letter-spacing: 0.5px; }

footer { padding: 36px 0 44px; color: var(--muted); font-size: 14px; border-top: 1px solid var(--line); margin-top: 64px; }
footer .wrap { display: flex; flex-wrap: wrap; gap: 10px 24px; justify-content: space-between; }

:focus-visible { outline: 2px solid var(--cyan); outline-offset: 3px; border-radius: 6px; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .btn { transition: none; }
}