:root{
  --bg: #ffffff;
  --text: #111111;
  --muted: #666666;
  --border: rgba(17,17,17,0.12);

  --radius: 8px;
  --container: 1120px;

  --pad-m: 24px;
  --pad-d: 32px;

  --section-m: 56px;
  --section-d: 96px;

  --btn-h: 52px;
}

*{ box-sizing: border-box; }
html, body{ height: 100%; }
body{
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, "Noto Sans", "Liberation Sans", sans-serif;
  line-height: 1.6;
  text-rendering: geometricPrecision;
  -webkit-font-smoothing: antialiased;
}

a{ color: inherit; text-decoration: none; }
a:focus-visible, button:focus-visible{
  outline: 2px solid var(--text);
  outline-offset: 3px;
  border-radius: 6px;
}

.container{
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--pad-m);
}

.section{
  padding: var(--section-m) 0;
}

.site-header{
  position: sticky;
  top: 0;
  background: rgba(255,255,255,0.94);
  backdrop-filter: blur(0px);
  border-bottom: 1px solid var(--border);
  z-index: 10;
}

.header-inner{
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
}

.brand{
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
}
.brand__mark{
  font-size: 18px;
  line-height: 1;
}
.brand__name{
  font-weight: 800;
  letter-spacing: 0.02em;
}

.nav{
  display: none;
  gap: 18px;
}
.nav__link{
  color: var(--muted);
}
.nav__link:hover{
  color: var(--text);
}

.h1{
  font-size: clamp(28px, 5vw, 56px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 0 0 14px 0;
  font-weight: 800;
}
.h1--compact{
  font-size: clamp(28px, 4.5vw, 52px);
}

.h2{
  font-size: clamp(18px, 2.2vw, 22px);
  margin: 0 0 14px 0;
  color: var(--text);
  font-weight: 650;
  letter-spacing: -0.01em;
}

.h3{
  font-size: clamp(18px, 2.4vw, 24px);
  margin: 0;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.lead{
  margin: 0 0 18px 0;
  font-size: 18px;
  color: var(--text);
}

.muted{ color: var(--muted); }
.micro{
  font-size: 13px;
  margin-top: 10px;
}

.mono{
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}

.hero{
  padding-top: calc(var(--section-m) + 10px);
}
.hero-grid{
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
}
.hero-copy{
  max-width: 760px;
}
.hero-aside{
  display: block;
}
.aside-card{
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
}
.aside-title{
  font-weight: 800;
  margin-bottom: 6px;
}

.cta-row{
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 16px;
}

.btn{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: var(--btn-h);
  padding: 0 18px;
  border-radius: 8px;
  font-weight: 800;
  letter-spacing: 0.01em;
  border: 1px solid var(--text);
  background: transparent;
  user-select: none;
}

.btn--primary{
  background: var(--text);
  color: #ffffff;
}
.btn--primary:hover{
  background: #ffffff;
  color: var(--text);
}

.btn--ghost{
  background: #ffffff;
  color: var(--text);
}
.btn--ghost:hover{
  background: var(--text);
  color: #ffffff;
}

.section-head{
  display: grid;
  gap: 8px;
  margin-bottom: 18px;
  max-width: 760px;
}

.grid-list{
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 12px;
}
.grid-list--two{
  grid-template-columns: 1fr;
}
.grid-list--three{
  grid-template-columns: 1fr;
}

.card{
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 16px;
  font-weight: 650;
  letter-spacing: -0.01em;
}

.card--warning{
  border-color: rgba(17,17,17,0.22);
}

.one-line{
  margin: 18px 0 0 0;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.split{
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  align-items: start;
}

.stack{
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
}
.stack-title{
  font-weight: 800;
  margin-bottom: 10px;
}
.plain-list{
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 10px;
}
.plain-list__item{
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-weight: 650;
}

.chips{
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.chip{
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.final{
  padding-bottom: calc(var(--section-m) + 10px);
}
.final-box{
  border: 1px solid var(--border);
  border-radius: calc(var(--radius) + 6px);
  padding: 22px;
  display: grid;
  gap: 16px;
}
.cta-row--final{
  margin-top: 0;
}

.site-footer{
  border-top: 1px solid var(--border);
  padding: 26px 0;
}
.footer-inner{
  display: grid;
  gap: 14px;
}
.footer-title{
  font-weight: 900;
  letter-spacing: 0.02em;
}
.footer-right{
  display: flex;
  gap: 16px;
}
.footer-link{
  color: var(--muted);
}
.footer-link:hover{
  color: var(--text);
}

@media (min-width: 768px){
  .container{ padding: 0 var(--pad-d); }
  .section{ padding: var(--section-d) 0; }
  .hero{ padding-top: calc(var(--section-d) + 10px); }

  .nav{ display: inline-flex; }

  .cta-row{
    grid-template-columns: max-content max-content;
    justify-content: start;
    gap: 12px;
  }

  .hero-grid{
    grid-template-columns: 1.2fr 0.8fr;
    gap: 28px;
    align-items: start;
  }

  .grid-list--two{ grid-template-columns: 1fr 1fr; }
  .grid-list--three{ grid-template-columns: 1fr 1fr 1fr; }

  .split{
    grid-template-columns: 1.1fr 0.9fr;
    gap: 28px;
  }

  .footer-inner{
    grid-template-columns: 1fr auto;
    align-items: center;
  }
}