:root{
  --ink:#0a1f3d;
  --ink-rgb:10,31,61;
  --paper:#f1f3f5;
  --paper-rgb:241,243,245;
  --paper-tint:#e4e8ec;
  --ink-tint:#152a4a;
  --accent:#2563eb;
  --accent-rgb:37,99,235;
  --accent-light:#60a5fa;
  --mono:"JetBrains Mono",ui-monospace,monospace;
  --serif:"Fraunces",Georgia,serif;
  --sans:"Inter",system-ui,sans-serif;
}

*{box-sizing:border-box;margin:0;padding:0}

html,body{
  width:100%;
  min-height:100vh;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--sans);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  line-height:1.65;
  font-size:16px;
}

/* Header */
.site-header{
  position:fixed;
  top:0;
  left:0;
  right:0;
  z-index:100;
  background:rgba(var(--paper-rgb),.92);
  backdrop-filter:blur(12px);
  border-bottom:1px solid rgba(var(--ink-rgb),.08);
  padding:0 6vw;
  height:64px;
  display:flex;
  align-items:center;
  justify-content:space-between;
}

.site-header .logo{
  font-family:var(--serif);
  font-weight:700;
  font-size:22px;
  color:var(--ink);
  text-decoration:none;
  letter-spacing:-.02em;
}

.site-header .logo span{
  color:var(--accent);
  font-style:italic;
}

.site-header nav{
  display:flex;
  gap:2em;
  align-items:center;
}

.site-header nav a{
  font-family:var(--mono);
  font-size:11px;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--ink);
  text-decoration:none;
  opacity:.7;
  transition:opacity .2s;
}

.site-header nav a:hover{
  opacity:1;
  color:var(--accent);
}

/* Main Content */
main{
  max-width:780px;
  margin:0 auto;
  padding:120px 24px 80px;
}

/* Typography */
h1{
  font-family:var(--serif);
  font-weight:700;
  font-size:42px;
  line-height:1.1;
  letter-spacing:-.02em;
  margin-bottom:8px;
  color:var(--ink);
}

h2{
  font-family:var(--serif);
  font-weight:600;
  font-size:26px;
  line-height:1.2;
  margin-top:48px;
  margin-bottom:20px;
  color:var(--ink);
  padding-bottom:12px;
  border-bottom:2px solid var(--accent);
  display:inline-block;
}

h3{
  font-family:var(--serif);
  font-weight:600;
  font-size:20px;
  line-height:1.3;
  margin-top:32px;
  margin-bottom:12px;
  color:var(--ink-tint);
}

h4{
  font-family:var(--sans);
  font-weight:600;
  font-size:16px;
  margin-top:24px;
  margin-bottom:8px;
  color:var(--ink);
}

p{
  margin-bottom:16px;
  opacity:.85;
}

/* Meta info */
.doc-meta{
  font-family:var(--mono);
  font-size:12px;
  letter-spacing:.1em;
  text-transform:uppercase;
  opacity:.55;
  margin-bottom:48px;
  padding-bottom:24px;
  border-bottom:1px solid rgba(var(--ink-rgb),.12);
}

.doc-meta span{
  margin-right:2em;
}

/* Blockquote / Callout */
.callout{
  margin:32px 0;
  padding:24px 28px;
  background:rgba(var(--accent-rgb),.08);
  border-left:4px solid var(--accent);
  border-radius:0 8px 8px 0;
}

.callout p{
  margin:0;
  font-family:var(--serif);
  font-style:italic;
  font-size:18px;
  line-height:1.5;
  opacity:.9;
}

.callout p strong{
  font-style:normal;
}

/* Tables */
table{
  width:100%;
  border-collapse:collapse;
  margin:24px 0 32px;
  font-size:14px;
}

th{
  font-family:var(--mono);
  font-size:11px;
  letter-spacing:.12em;
  text-transform:uppercase;
  text-align:left;
  padding:14px 16px;
  background:rgba(var(--ink-rgb),.06);
  border-bottom:2px solid var(--accent);
  font-weight:600;
}

td{
  padding:14px 16px;
  border-bottom:1px solid rgba(var(--ink-rgb),.08);
  vertical-align:top;
}

tr:hover td{
  background:rgba(var(--accent-rgb),.03);
}

/* Lists */
ul,ol{
  margin:16px 0 24px 24px;
}

li{
  margin-bottom:8px;
  opacity:.85;
}

/* Links */
a{
  color:var(--accent);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:border-color .2s;
}

a:hover{
  border-bottom-color:var(--accent);
}

/* Tier badges */
.tier-badge{
  display:inline-block;
  font-family:var(--mono);
  font-size:10px;
  letter-spacing:.15em;
  text-transform:uppercase;
  padding:4px 10px;
  border-radius:4px;
  font-weight:600;
  margin-right:8px;
}

.tier-1{
  background:rgba(239,68,68,.12);
  color:#dc2626;
}

.tier-2{
  background:rgba(245,158,11,.12);
  color:#d97706;
}

.tier-3{
  background:rgba(37,99,235,.12);
  color:#2563eb;
}

/* Footer */
.site-footer{
  margin-top:80px;
  padding:40px 24px;
  border-top:1px solid rgba(var(--ink-rgb),.1);
  text-align:center;
}

.site-footer .links{
  display:flex;
  justify-content:center;
  gap:2em;
  margin-bottom:16px;
  flex-wrap:wrap;
}

.site-footer .links a{
  font-family:var(--mono);
  font-size:11px;
  letter-spacing:.15em;
  text-transform:uppercase;
  opacity:.6;
}

.site-footer .copyright{
  font-family:var(--mono);
  font-size:11px;
  opacity:.4;
}

/* Responsive */
@media (max-width:640px){
  .site-header{
    padding:0 4vw;
  }
  .site-header nav{
    gap:1em;
  }
  .site-header nav a{
    font-size:10px;
    letter-spacing:.1em;
  }
  h1{
    font-size:32px;
  }
  h2{
    font-size:22px;
  }
  main{
    padding:100px 16px 60px;
  }
  table{
    font-size:13px;
  }
  th,td{
    padding:10px 12px;
  }
}

/* Print */
@media print{
  .site-header{
    position:static;
    background:none;
    border-bottom:1px solid #ccc;
  }
  main{
    padding-top:24px;
  }
}