:root {
  --bg: #0e0e10;
  --panel: #17171a;
  --line: #2a2a2e;
  --ink: #ecebe6;
  --dim: #a8a6a0;
  --teal: #4fd1c5;
  --amber: #e99652;
  --violet: #c4a0ff;
  --radius: 14px;
  color-scheme: dark;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 17px/1.6 "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
}
a { color: var(--teal); }
img { max-width: 100%; height: auto; display: block; }
.wrap { width: min(1120px, 100% - 32px); margin-inline: auto; }

header.top {
  position: sticky; top: 0; z-index: 10;
  background: rgba(14, 14, 16, .86); backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
header.top .wrap { display: flex; align-items: center; gap: 24px; height: 64px; }
.brand { font-weight: 600; letter-spacing: .38em; color: var(--ink); text-decoration: none; font-size: 15px; }
.brand span { letter-spacing: .1em; color: var(--dim); margin-left: .4em; }
nav { margin-left: auto; display: flex; gap: 22px; align-items: center; }
nav a { color: var(--dim); text-decoration: none; font-size: 15px; }
nav a:hover { color: var(--ink); }

.btn {
  display: inline-block; padding: 13px 22px; border-radius: 999px; text-decoration: none;
  font-weight: 600; font-size: 16px; border: 1px solid transparent; cursor: pointer;
}
.btn.primary { background: var(--teal); color: #08201e; }
.btn.primary:hover { filter: brightness(1.08); }
.btn.ghost { border-color: var(--line); color: var(--ink); }
.btn.ghost:hover { border-color: var(--dim); }
.btn.small { padding: 8px 16px; font-size: 14px; }

.hero { padding: 72px 0 40px; text-align: center;
  background: radial-gradient(70% 60% at 50% 0%, rgba(79, 209, 197, .16), transparent 70%); }
.eyebrow { color: var(--teal); letter-spacing: .3em; font-size: 13px; font-weight: 600; text-transform: uppercase; }
h1 { font-size: clamp(36px, 6vw, 64px); line-height: 1.08; margin: 14px 0 18px; letter-spacing: -.01em; }
.lead { color: var(--dim); font-size: clamp(17px, 2.2vw, 21px); max-width: 680px; margin: 0 auto 30px; }
.cta { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.price { color: var(--dim); font-size: 15px; margin-top: 14px; }
.hero img { margin: 44px auto 0; border-radius: var(--radius); box-shadow: 0 30px 80px rgba(0, 0, 0, .55); }

section { padding: 64px 0; border-top: 1px solid var(--line); }
h2 { font-size: clamp(26px, 3.6vw, 38px); margin: 0 0 12px; }
.mode { display: grid; grid-template-columns: 1fr 1.25fr; gap: 40px; align-items: center; }
.mode.flip { grid-template-columns: 1.25fr 1fr; }
.mode.flip .text { order: 2; }
.mode img { border-radius: var(--radius); box-shadow: 0 20px 60px rgba(0, 0, 0, .5); }
.mode .tag { font-weight: 600; letter-spacing: .25em; font-size: 13px; }
.mode p { color: var(--dim); }
.mode ul { color: var(--dim); padding-left: 20px; margin: 0; }

.grid3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; }
.card h3 { margin: 0 0 6px; font-size: 18px; }
.card p { margin: 0; color: var(--dim); font-size: 15px; }

.buy { text-align: center; }
.buy .box { display: inline-block; text-align: left; background: var(--panel); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 28px 32px; max-width: 560px; width: 100%; }
.buy .amount { font-size: 44px; font-weight: 700; }
.buy ul { color: var(--dim); padding-left: 20px; }

footer { border-top: 1px solid var(--line); padding: 30px 0 40px; color: var(--dim); font-size: 14px; }
footer .wrap { display: flex; gap: 20px; flex-wrap: wrap; align-items: center; }
footer nav { margin-left: auto; }

.doc { padding: 48px 0 64px; }
.doc h1 { font-size: clamp(30px, 4vw, 42px); }
.doc h2 { font-size: 22px; margin-top: 34px; }
.doc p, .doc li { color: #cfcdc7; }
.doc .note { background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 14px 18px; color: var(--dim); }
.steps { counter-reset: s; list-style: none; padding: 0; }
.steps li { counter-increment: s; position: relative; padding-left: 46px; margin: 14px 0; }
.steps li::before { content: counter(s); position: absolute; left: 0; top: 0; width: 30px; height: 30px; border-radius: 50%;
  background: var(--panel); border: 1px solid var(--teal); color: var(--teal); display: grid; place-items: center; font-weight: 600; font-size: 14px; }

@media (max-width: 820px) {
  .mode, .mode.flip { grid-template-columns: 1fr; }
  .mode.flip .text { order: 0; }
  .grid3 { grid-template-columns: 1fr; }
  nav a.hide-sm { display: none; }
}