:root {
  --ink: #1b2430;
  --muted: #5a6573;
  --bg: #ffffff;
  --soft: #f4f6f8;
  --line: #dde2e8;
  --accent: #1f6f5c;
  --accent-ink: #ffffff;
  --max: 980px;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
}
a { color: var(--accent); }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 20px; }
header.top { border-bottom: 1px solid var(--line); }
header.top .wrap { display: flex; justify-content: space-between; align-items: center; height: 64px; }
.brand { font-weight: 700; font-size: 19px; color: var(--ink); text-decoration: none; letter-spacing: -0.01em; }
.brand span { color: var(--accent); }
nav a { margin-left: 18px; color: var(--muted); text-decoration: none; font-size: 15px; }
nav a:hover { color: var(--ink); }
.menu-btn { display: none; background: none; border: 0; padding: 12px 6px; cursor: pointer; }
.menu-btn span, .menu-btn span::before, .menu-btn span::after {
  display: block; width: 24px; height: 2px; background: var(--ink); position: relative; transition: transform .2s, opacity .2s;
}
.menu-btn span::before, .menu-btn span::after { content: ""; position: absolute; left: 0; }
.menu-btn span::before { top: -7px; }
.menu-btn span::after { top: 7px; }
header.top.open .menu-btn span { background: transparent; }
header.top.open .menu-btn span::before { transform: translateY(7px) rotate(45deg); }
header.top.open .menu-btn span::after { transform: translateY(-7px) rotate(-45deg); }
@media (max-width: 720px) {
  header.top .wrap { position: relative; }
  .menu-btn { display: block; }
  nav { display: none; position: absolute; top: 64px; left: 0; right: 0; background: var(--bg);
        border-bottom: 1px solid var(--line); padding: 4px 20px 10px; z-index: 10; box-shadow: 0 8px 16px rgba(0,0,0,.06); }
  header.top.open nav { display: block; }
  nav a { display: block; margin: 0; padding: 12px 0; font-size: 17px; color: var(--ink); border-top: 1px solid var(--line); }
  nav a:first-child { border-top: 0; }
}
.hero { padding: 64px 0 48px; }
.hero h1 { font-size: clamp(30px, 5vw, 44px); line-height: 1.15; margin: 0 0 18px; letter-spacing: -0.02em; }
.hero p.lead { font-size: 20px; color: var(--muted); max-width: 720px; margin: 0 0 28px; }
.btn {
  display: inline-block; background: var(--accent); color: var(--accent-ink);
  padding: 14px 22px; border-radius: 8px; text-decoration: none; font-weight: 600;
}
.btn.secondary { background: transparent; color: var(--accent); border: 2px solid var(--accent); padding: 12px 20px; }
.btn + .btn { margin-left: 10px; }
.note { font-size: 14px; color: var(--muted); margin-top: 12px; }
section { padding: 48px 0; border-top: 1px solid var(--line); }
section.soft { background: var(--soft); }
h2 { font-size: 28px; line-height: 1.25; margin: 0 0 18px; letter-spacing: -0.01em; }
h3 { font-size: 19px; margin: 0 0 8px; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 22px; }
.card { background: var(--bg); border: 1px solid var(--line); border-radius: 10px; padding: 22px; }
.card p { margin: 0; color: var(--muted); }
.steps { counter-reset: s; list-style: none; padding: 0; margin: 0; }
.steps li { counter-increment: s; position: relative; padding: 0 0 18px 48px; }
.steps li::before {
  content: counter(s); position: absolute; left: 0; top: 0; width: 32px; height: 32px;
  border-radius: 50%; background: var(--accent); color: #fff; font-weight: 700;
  display: flex; align-items: center; justify-content: center; font-size: 15px;
}
ul.check { padding-left: 0; list-style: none; columns: 2 260px; margin: 0; }
ul.check li { padding-left: 26px; position: relative; margin-bottom: 8px; break-inside: avoid; }
ul.check li::before { content: "\2713"; position: absolute; left: 0; color: var(--accent); font-weight: 700; }
blockquote {
  margin: 0; padding: 18px 20px; border-left: 4px solid var(--accent); background: var(--bg);
  border-radius: 0 8px 8px 0; font-style: italic;
}
blockquote cite { display: block; font-style: normal; font-size: 14px; color: var(--muted); margin-top: 8px; }
.guarantee { border: 2px solid var(--accent); border-radius: 12px; padding: 26px; background: var(--bg); }
.price { font-size: 30px; font-weight: 700; margin: 4px 0 8px; }
details { border-bottom: 1px solid var(--line); padding: 14px 0; }
summary { cursor: pointer; font-weight: 600; }
details p { color: var(--muted); margin: 10px 0 0; }
.platforms { color: var(--muted); }
footer { border-top: 1px solid var(--line); padding: 28px 0 40px; font-size: 14px; color: var(--muted); }
footer a { color: var(--muted); }
@media (max-width: 560px) {
  .btn + .btn { margin: 10px 0 0; }
  .btn { display: block; text-align: center; }
}