:root {
  --ink: #14181f;
  --ink-soft: #4a5566;
  --line: #e3e7ee;
  --bg: #ffffff;
  --bg-alt: #f6f8fb;
  --accent: #1f5fd6;
  --accent-dark: #1749a8;
  --radius: 12px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  -webkit-text-size-adjust: 100%;
}

.wrap { width: 100%; max-width: 1080px; margin: 0 auto; padding: 0 24px; }

h1, h2, h3 { line-height: 1.25; margin: 0 0 12px; letter-spacing: -0.01em; }
h1 { font-size: clamp(28px, 4.5vw, 44px); font-weight: 750; }
h2 { font-size: clamp(22px, 3vw, 30px); }
h3 { font-size: 17px; }
p { margin: 0 0 14px; }
code { font-family: ui-monospace, "Cascadia Mono", Consolas, monospace; font-size: 0.92em; background: var(--bg-alt); padding: 1px 5px; border-radius: 4px; }

section { padding: 64px 0; }
section.alt { background: var(--bg-alt); }
.section-lead { color: var(--ink-soft); max-width: 68ch; margin-bottom: 28px; }

/* header */
.site-header {
  position: sticky; top: 0; z-index: 10;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.header-row { display: flex; align-items: center; justify-content: space-between; height: 62px; gap: 16px; }
.logo { font-weight: 700; font-size: 18px; color: var(--ink); text-decoration: none; white-space: nowrap; }
.logo span { color: var(--accent); }
.site-header nav { display: flex; gap: 22px; flex-wrap: wrap; }
.site-header nav a { color: var(--ink-soft); text-decoration: none; font-size: 15px; }
.site-header nav a:hover { color: var(--accent); }

/* hero */
.hero { padding: 76px 0 56px; }
.hero .lead { font-size: 19px; color: var(--ink-soft); max-width: 74ch; margin-bottom: 26px; }
.hero-note { font-size: 14px; color: var(--ink-soft); margin-top: 16px; }

.cta-row { display: flex; gap: 12px; flex-wrap: wrap; }
.btn {
  display: inline-block; padding: 13px 22px; border-radius: var(--radius);
  border: 1px solid var(--accent); color: var(--accent); background: #fff;
  font-weight: 600; text-decoration: none; font-size: 15px;
}
.btn:hover { background: #eef3fd; }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-dark); }

/* strip */
.strip { padding: 0; }
.strip-row {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px;
  margin: 0 auto 8px; padding: 26px 24px;
  background: var(--bg-alt); border-radius: var(--radius);
}
.strip-row > div { display: flex; flex-direction: column; gap: 2px; }
.strip-row b { font-size: 26px; color: var(--accent); letter-spacing: -0.02em; }
.strip-row span { font-size: 13px; color: var(--ink-soft); line-height: 1.35; }

/* cards */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 18px; }
.card { border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; background: #fff; }
.card p { margin: 0; color: var(--ink-soft); font-size: 15px; }
.card em { font-style: normal; color: var(--ink); font-weight: 600; }
.card-plain { background: var(--bg-alt); }

/* why grid */
.why-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 26px 32px; }
.why-grid h3 { margin-bottom: 6px; }
.why-grid p { margin: 0; color: var(--ink-soft); font-size: 15px; }

/* prices */
.price-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 16px; }
.price { border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; background: #fff; }
.price h3 { font-size: 16px; }
.price-num { font-size: 27px; font-weight: 750; color: var(--ink); margin-bottom: 12px; letter-spacing: -0.02em; }
.price-num span { font-size: 14px; font-weight: 500; color: var(--ink-soft); }
.price ul { margin: 0; padding-left: 18px; font-size: 14px; color: var(--ink-soft); }
.price li { margin-bottom: 5px; }
.price-feature { border-color: var(--accent); box-shadow: 0 8px 24px rgba(31, 95, 214, 0.12); }
.price-feature .price-num { color: var(--accent); }
.price-note { margin-top: 22px; font-size: 14px; color: var(--ink-soft); }

/* steps */
.steps { margin: 0 0 30px; padding-left: 22px; }
.steps li { margin-bottom: 20px; padding-left: 6px; }
.steps h3 { display: inline; font-size: 17px; }
.steps p { margin: 4px 0 0; color: var(--ink-soft); font-size: 15px; }

/* faq */
details { border-bottom: 1px solid var(--line); padding: 16px 0; }
summary { cursor: pointer; font-weight: 600; font-size: 16px; list-style: none; }
summary::-webkit-details-marker { display: none; }
summary::before { content: "+"; color: var(--accent); font-weight: 700; margin-right: 10px; }
details[open] summary::before { content: "−"; }
details p { margin: 10px 0 0; color: var(--ink-soft); font-size: 15px; max-width: 82ch; }

/* footer */
.site-footer { border-top: 1px solid var(--line); padding: 26px 0; background: var(--bg-alt); }
.footer-row { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; font-size: 14px; color: var(--ink-soft); }
.site-footer a { color: var(--accent); text-decoration: none; }
.site-footer a:hover { text-decoration: underline; }

@media (max-width: 720px) {
  section { padding: 46px 0; }
  .strip-row { grid-template-columns: repeat(2, 1fr); }
  .header-row { flex-direction: column; height: auto; padding: 12px 0; gap: 8px; }
  .site-header nav { gap: 14px; justify-content: center; }
}