:root {
  --bg: #f5f7f8; --surface: #ffffff; --surface-2: #e9f1f0; --text: #10212b; --muted: #56707c;
  --line: #d6e2e2; --accent: #0f766e; --accent-hover: #0b5f58; --on-accent: #ffffff;
  --shadow: 0 18px 50px rgba(16, 33, 43, .14);
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #09141b; --surface: #0d1c24; --surface-2: #11242e; --text: #ebf4f5; --muted: #9fb6bf;
    --line: #1f3641; --accent: #2bb3a6; --accent-hover: #4fcabe; --on-accent: #06231f;
    --shadow: 0 18px 50px rgba(0, 0, 0, .45);
  }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--text); line-height: 1.6;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans", Ubuntu, sans-serif;
}
img { display: block; max-width: 100%; height: auto; }
a { color: var(--accent); }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; border-radius: 4px; }
.wrap { width: min(1120px, 100% - 32px); margin-inline: auto; }

.top { border-bottom: 1px solid var(--line); background: var(--surface); }
.top .wrap { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; color: inherit; font-weight: 700; text-decoration: none; }
.brand img { width: 32px; height: 32px; border-radius: 8px; }
.lang { font-size: .9rem; font-weight: 600; text-decoration: none; }

.hero { padding: 72px 0 40px; text-align: center; }
h1 { margin: 0 auto 16px; max-width: 16ch; font-size: clamp(2.3rem, 6vw, 3.8rem); line-height: 1.08; letter-spacing: -.02em; }
.lead { margin: 0 auto 28px; max-width: 58ch; color: var(--muted); font-size: 1.2rem; }
.cta { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; }
.btn {
  display: inline-block; padding: 12px 22px; border: 1px solid var(--accent); border-radius: 10px;
  font-weight: 700; text-decoration: none; color: var(--accent);
}
.btn.primary { background: var(--accent); color: var(--on-accent); }
.btn.primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); }
.btn:not(.primary):hover { background: var(--surface-2); }
.note { margin: 16px 0 0; color: var(--muted); font-size: .92rem; }
.shot { border-radius: 14px; box-shadow: var(--shadow); }
.hero .shot { margin: 48px auto 0; }

section { padding: 56px 0; }
h2 { margin: 0 0 12px; font-size: clamp(1.6rem, 3.5vw, 2.2rem); line-height: 1.2; letter-spacing: -.01em; }
h3 { margin: 0 0 8px; font-size: 1.1rem; }
.steps { display: grid; gap: 16px; grid-template-columns: repeat(4, 1fr); margin: 28px 0 0; padding: 0; list-style: none; counter-reset: step; }
.steps li { padding: 20px; border: 1px solid var(--line); border-radius: 12px; background: var(--surface); counter-increment: step; }
.steps li::before { content: counter(step); display: block; margin-bottom: 8px; color: var(--accent); font-size: 1.4rem; font-weight: 800; }
kbd { padding: 1px 6px; border: 1px solid var(--line); border-radius: 5px; background: var(--surface-2); font: .85em ui-monospace, monospace; }

.feature { display: grid; grid-template-columns: 5fr 7fr; gap: 40px; align-items: center; padding: 28px 0; }
.feature:nth-of-type(even) { grid-template-columns: 7fr 5fr; }
.feature:nth-of-type(even) > div { order: 2; }
.feature p { margin: 0; color: var(--muted); }

.privacy { border-block: 1px solid var(--line); background: var(--surface-2); }
.pillars { display: grid; gap: 24px; grid-template-columns: repeat(3, 1fr); margin-top: 24px; }
.pillars p { margin: 0; color: var(--muted); }

.final { text-align: center; }
.final p { margin: 0 0 24px; color: var(--muted); }

.foot { border-top: 1px solid var(--line); padding: 24px 0; color: var(--muted); font-size: .9rem; }
.foot .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px 24px; }
.foot nav { display: flex; flex-wrap: wrap; gap: 8px 20px; }

.prose { max-width: 72ch; padding: 48px 0 64px; }
.prose h1 { max-width: none; font-size: clamp(1.9rem, 5vw, 2.6rem); }
.prose h2 { margin-top: 32px; font-size: 1.3rem; }

@media (max-width: 860px) {
  .hero { padding-top: 48px; }
  .steps, .pillars { grid-template-columns: 1fr 1fr; }
  .feature, .feature:nth-of-type(even) { grid-template-columns: 1fr; gap: 20px; }
  .feature:nth-of-type(even) > div { order: 0; }
}
@media (max-width: 520px) {
  .steps, .pillars { grid-template-columns: 1fr; }
  .btn { width: 100%; text-align: center; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }