:root {
  --bg: #fbfbf9;
  --bg-alt: #f2f3ef;
  --card: #ffffff;
  --ink: #15201f;
  --muted: #5b6563;
  --line: #e2e5df;
  --accent: #0d9488;
  --accent-ink: #0a6f66;
  --accent-soft: #d9f1ee;
  --radius: 14px;
  --max: 1080px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1413;
    --bg-alt: #151c1b;
    --card: #1a2322;
    --ink: #eef2f0;
    --muted: #a3aeab;
    --line: #26312f;
    --accent: #2dd4bf;
    --accent-ink: #5eead4;
    --accent-soft: #123b37;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: Inter, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  font-size: 17px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent-ink); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3 { line-height: 1.15; margin: 0 0 0.5em; letter-spacing: -0.015em; }
h2 { font-size: clamp(1.6rem, 3vw, 2.1rem); }
h3 { font-size: 1.15rem; }
p { margin: 0 0 1em; }
.muted { color: var(--muted); }

.skip-link { position: absolute; left: -999px; top: 8px; background: var(--accent); color: #fff; padding: 8px 12px; border-radius: 8px; }
.skip-link:focus { left: 8px; z-index: 10; }

/* header */
.top {
  position: sticky; top: 0; z-index: 5;
  display: flex; align-items: center; gap: 16px;
  padding: 14px 20px;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.wordmark { display: inline-flex; align-items: center; gap: 8px; font-weight: 700; color: var(--ink); }
.wordmark:hover { text-decoration: none; }
.mark {
  display: inline-grid; place-items: center;
  width: 38px; height: 38px; border-radius: 10px;
  background: var(--accent); color: #fff;
  font-size: 12px; font-weight: 800; letter-spacing: 0.04em;
}
.word { font-size: 1.05rem; }
.nav { margin-left: auto; display: flex; gap: 18px; align-items: center; font-size: 0.95rem; }
.nav a { color: var(--ink); }
.nav__cta { padding: 7px 14px; border-radius: 999px; background: var(--accent-soft); color: var(--accent-ink) !important; font-weight: 600; }
.lang {
  border: 1px solid var(--line); background: var(--card); color: var(--ink);
  border-radius: 999px; padding: 6px 12px; font: inherit; font-size: 0.85rem; font-weight: 600; cursor: pointer;
}
@media (max-width: 760px) { .nav { display: none; } .lang { margin-left: auto; } }

/* layout */
.section { max-width: var(--max); margin: 0 auto; padding: 72px 20px; }
.section--alt { max-width: none; background: var(--bg-alt); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.section--alt > * { max-width: var(--max); margin-left: auto; margin-right: auto; }
.section__note { color: var(--muted); margin-top: -0.4em; margin-bottom: 1.6em; }

/* hero */
.hero { max-width: var(--max); margin: 0 auto; padding: 88px 20px 56px; }
.eyebrow { color: var(--accent-ink); font-weight: 600; font-size: 0.9rem; letter-spacing: 0.02em; margin-bottom: 1.2em; }
.hero h1 { font-size: clamp(2.1rem, 5vw, 3.6rem); font-weight: 800; max-width: 18ch; }
.lead { font-size: clamp(1.1rem, 1.8vw, 1.3rem); color: var(--muted); max-width: 56ch; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin: 28px 0 44px; }
.btn {
  display: inline-block; padding: 12px 20px; border-radius: 10px;
  border: 1px solid var(--line); background: var(--card); color: var(--ink); font-weight: 600;
}
.btn:hover { text-decoration: none; border-color: var(--accent); }
.btn--primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn--primary:hover { background: var(--accent-ink); border-color: var(--accent-ink); }
.btn--big { font-size: 1.15rem; padding: 16px 26px; }
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin: 0; padding-top: 28px; border-top: 1px solid var(--line); }
.stats div { display: flex; flex-direction: column-reverse; }
.stats dd { margin: 0; font-size: 1.7rem; font-weight: 800; letter-spacing: -0.02em; color: var(--ink); }
.stats dt { color: var(--muted); font-size: 0.9rem; min-height: 2.8em; }
@media (max-width: 760px) { .stats { grid-template-columns: 1fr 1fr; } }

/* cards */
.grid { display: grid; gap: 18px; }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
@media (max-width: 900px) { .grid--3, .grid--2 { grid-template-columns: 1fr; } }
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px 24px 12px;
}
.card__tag { color: var(--accent-ink); font-size: 0.85rem; font-weight: 600; letter-spacing: 0.02em; margin-bottom: 0.6em; }
.card h3 { margin-bottom: 0.6em; }
.card p:last-child { color: var(--muted); }

/* method */
.steps { list-style: none; counter-reset: step; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px 36px; }
.steps li { counter-increment: step; padding-left: 52px; position: relative; }
.steps li::before {
  content: counter(step, decimal-leading-zero);
  position: absolute; left: 0; top: 2px;
  font-weight: 800; color: var(--accent-ink); font-size: 1.1rem; letter-spacing: -0.02em;
}
.steps p { color: var(--muted); }
@media (max-width: 760px) { .steps { grid-template-columns: 1fr; } }

/* about + contact */
.section--alt .about { max-width: var(--max); }
.about p { max-width: 70ch; }
.links { display: flex; flex-wrap: wrap; gap: 18px; font-weight: 600; }
.contact { text-align: center; }
.contact p { max-width: 56ch; margin-left: auto; margin-right: auto; }
.contact .btn { margin: 8px 0 18px; }

.foot {
  display: flex; flex-wrap: wrap; gap: 8px 24px; justify-content: center;
  padding: 28px 20px 40px; border-top: 1px solid var(--line);
  color: var(--muted); font-size: 0.9rem;
}