:root {
  --brand-start: #4D80FF;
  --brand-end: #754DF2;
  --brand-grad: linear-gradient(90deg, #4D80FF, #754DF2);
  --tint: #6466F7;
  --mint: #3FCDB4;
  --text: #15161a;
  --muted: #6b6c75;
  --faint: #9a9ba3;
  --bg: #ffffff;
  --surface: #f5f6fa;
  --border: rgba(20, 21, 26, 0.1);
  --radius: 12px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --text: #f2f2f5;
    --muted: #a6a7b0;
    --faint: #74757e;
    --bg: #101116;
    --surface: #1a1b22;
    --border: rgba(240, 240, 245, 0.12);
  }
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", Inter,
    "Segoe UI", Roboto, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
.wrap { max-width: 960px; margin: 0 auto; padding: 0 24px; }

header.site {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}
header.site .wrap {
  display: flex; align-items: center; gap: 14px; height: 60px;
}
.logo { display: flex; align-items: center; gap: 10px; font-weight: 600;
  font-size: 17px; text-decoration: none; color: var(--text); }
.logo img { width: 28px; height: 28px; border-radius: 7px; }
.lang { margin-left: auto; display: flex; gap: 4px; font-size: 13px; }
.lang a { color: var(--muted); text-decoration: none; padding: 4px 8px;
  border-radius: 6px; }
.lang a.on { color: var(--text); background: var(--surface); font-weight: 600; }
.lang a:hover { color: var(--text); }

.btn {
  display: inline-block; padding: 11px 22px; border-radius: 10px;
  font-size: 15px; font-weight: 600; text-decoration: none;
  color: #fff; background: var(--brand-grad);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.btn:hover { transform: translateY(-1px);
  box-shadow: 0 6px 22px rgba(100, 102, 247, 0.35); }
.btn.small { padding: 7px 14px; font-size: 13px; border-radius: 8px; }
.btn.ghost { background: none; color: var(--text);
  border: 1px solid var(--border); }
.btn.ghost:hover { box-shadow: none; border-color: var(--faint); }

.hero { padding: 84px 0 56px; text-align: center; }
.hero h1 {
  font-size: clamp(34px, 6vw, 56px); line-height: 1.12;
  letter-spacing: -0.02em; font-weight: 700; margin-bottom: 18px;
}
.hero h1 .grad {
  background: var(--brand-grad);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero p.sub {
  font-size: 19px; color: var(--muted); max-width: 620px;
  margin: 0 auto 30px;
}
.hero .cta-row { display: flex; gap: 14px; justify-content: center;
  align-items: center; flex-wrap: wrap; }
.hero .note { font-size: 13px; color: var(--faint); margin-top: 12px; }

.demo {
  margin: 56px auto 0; max-width: 760px; background: var(--surface);
  border: 1px solid var(--border); border-radius: var(--radius);
  padding: 26px 28px 20px;
}
.demo .bar-row {
  display: flex; align-items: center; gap: 2px; height: 72px;
  overflow: hidden;
}
.demo .bar-row span {
  flex: none; width: 5px; border-radius: 3px;
  background: var(--brand-grad); background-size: 760px 100%;
  transition: width 0.6s ease, opacity 0.6s ease, margin 0.6s ease;
}
.demo .bar-row span.cut { background: var(--faint); opacity: 0.55; }
.demo .counts {
  display: flex; justify-content: space-between; align-items: baseline;
  margin-top: 14px; font-variant-numeric: tabular-nums;
}
.demo .counts .time { font-size: 15px; color: var(--muted); }
.demo .counts .pct {
  font-size: 30px; font-weight: 700;
  background: var(--brand-grad);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}

section { padding: 64px 0; }
section.alt { background: var(--surface); }
h2 { font-size: 30px; letter-spacing: -0.01em; margin-bottom: 10px; }
.lead { color: var(--muted); font-size: 17px; max-width: 640px;
  margin-bottom: 36px; }

.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.step { background: var(--bg); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 22px; }
.step .n {
  width: 30px; height: 30px; border-radius: 50%; color: #fff;
  background: var(--brand-grad); display: flex; align-items: center;
  justify-content: center; font-weight: 700; font-size: 14px;
  margin-bottom: 12px;
}
.step h3 { font-size: 17px; margin-bottom: 6px; }
.step p { font-size: 14px; color: var(--muted); }

.features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.feat { border: 1px solid var(--border); border-radius: var(--radius);
  padding: 22px; }
.feat .ico { font-size: 24px; margin-bottom: 10px; }
.feat h3 { font-size: 16px; margin-bottom: 6px; }
.feat p { font-size: 14px; color: var(--muted); }

.price-card {
  max-width: 420px; margin: 0 auto; text-align: center;
  border: 1px solid var(--border); border-radius: 16px; padding: 36px 32px;
  background: var(--bg);
}
.price-card .amount { font-size: 52px; font-weight: 700;
  letter-spacing: -0.02em; }
.price-card .amount small { font-size: 18px; font-weight: 500;
  color: var(--muted); }
.price-card ul { list-style: none; margin: 20px 0 26px; text-align: left; }
.price-card li { padding: 7px 0 7px 28px; position: relative;
  font-size: 15px; color: var(--muted); }
.price-card li::before {
  content: "✓"; position: absolute; left: 2px; font-weight: 700;
  background: var(--brand-grad);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}

details {
  border-bottom: 1px solid var(--border); padding: 16px 0;
}
details summary { cursor: pointer; font-weight: 600; font-size: 16px;
  list-style: none; display: flex; justify-content: space-between; }
details summary::after { content: "+"; color: var(--faint);
  font-size: 20px; font-weight: 400; }
details[open] summary::after { content: "–"; }
details p { margin-top: 10px; color: var(--muted); font-size: 15px; }

footer.site {
  border-top: 1px solid var(--border); padding: 34px 0 44px;
  font-size: 13px; color: var(--faint);
}
footer.site .wrap { display: flex; flex-wrap: wrap; gap: 8px 22px;
  align-items: center; }
footer.site a { color: var(--muted); text-decoration: none; }
footer.site a:hover { color: var(--text); }

@media (max-width: 760px) {
  .steps, .features { grid-template-columns: 1fr; }
  .hero { padding: 56px 0 40px; }
  section { padding: 48px 0; }
}