:root{
  --bg: #f7f9fb;
  --panel: #ffffff;
  --card: #ffffff;
  --text: #0f172a;
  --muted: #64748b;
  --accent: #2563eb;
  --border: #e5e7eb;
  --shadow: 0 2px 6px rgba(15, 23, 42, .08), 0 8px 24px rgba(15, 23, 42, .05);
  --gap: 26px;
}

*{ box-sizing: border-box; }
html, body{
  height: 100%;
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}


.topbar{
  position: sticky;
  top: 0;
  z-index: 10;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  padding: 26px 36px;
  min-height: 96px;
  background: rgba(255,255,255,0.92);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(8px);
  box-shadow: var(--shadow);
}
.brand{
  font-weight: 600;
  font-size: 22px;
  letter-spacing: 0.6px;
}
.nav{
  justify-self: center;
  display: flex;
  align-items: center;
  gap: 14px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1;
}
.nav-link{
  color: var(--muted);
  text-decoration: none;
  font-weight: 600;
  transition: color .15s ease;
}
.nav-link:hover{ color: var(--text); }
.nav-link.active{ color: var(--text); text-decoration: underline; }
.sep{ opacity: 0.4; user-select: none; }
.meta{
  justify-self: end;
  display: grid;
  gap: 4px;
  text-align: right;
}
.meta-line{ font-size: 13px; color: var(--muted); }
.meta-val{ color: var(--text); font-weight: 600; }


.about-layout{
  display: grid;
  gap: var(--gap);
  padding: 32px 40px;
  max-width: 1200px;
  margin: 0 auto;
}


.card{
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow);
  padding: 20px 22px;
}

.hero{
  padding: 26px 26px;
}
.hero h1{
  margin: 0 0 10px;
  font-size: 22px;
}
.hero p{
  margin: 0;
  color: var(--text);
  line-height: 1.6;
}

.grid{
  display: grid;
  grid-template-columns: repeat(2, minmax(0,1fr));
  gap: var(--gap);
}
.card h2{
  margin: 0 0 12px;
  font-size: 16px;
}
.card ul{
  margin: 0;
  padding-left: 18px;
  color: var(--text);
  line-height: 1.6;
}
.card p{ margin: 0; line-height: 1.6; }

details{
  border-top: 1px dashed var(--border);
  padding: 12px 0;
}
details:first-of-type{ border-top: 0; }
summary{
  cursor: pointer;
  font-weight: 600;
  color: var(--text);
}
summary::-webkit-details-marker{ display: none; }
summary::after{
  content: "›";
  display: inline-block;
  transform: rotate(90deg);
  margin-left: 6px;
  color: var(--muted);
}
details[open] summary::after{ transform: rotate(-90deg); }
details p{ color: var(--muted); margin-top: 8px; }


.footer{
  margin: 24px 0 40px;
}
.footer .inner{
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 40px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--muted);
  font-size: 12px;
}
.footer-link{
  color: var(--accent);
  text-decoration: none;
}
.footer-link:hover{ text-decoration: underline; }


@media (max-width: 1100px){
  .meta{ display: none; }
  .about-layout{ padding: 24px; }
  .grid{ grid-template-columns: 1fr; }
}