:root{
  --bg:#ffffff;
  --ink:#1a1a1a;
  --muted:#6a6a6a;
  --yellow:#ffd24a;   /* poster label */
  --tape:#d63a3a;     /* red tape accent */
  --grid:clamp(16px, 2vw, 28px);
  --w: min(980px, 92vw);
  --radius:12px;
  --shadow: 0 12px 24px rgba(0,0,0,.06);
  --mono:'Source Code Pro', monospace;
  --sans:'Inter', system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;background:var(--bg);color:var(--ink);font-family:var(--mono);-webkit-font-smoothing:antialiased;overflow-x:hidden;
}

/* ===== Background watermark title ===== */
.watermark{
  position:fixed; inset:0; pointer-events:none; user-select:none; z-index:0;
  display:grid; place-items:center;
  font-family:var(--sans); font-weight:900; letter-spacing:-.02em;
  color:#efefef; line-height:.9; text-align:center;
  font-size: clamp(22vw, 32vw, 36vw);
}

/* ===== page frame ===== */
.wrap{width:var(--w); margin:0 auto; padding:calc(var(--grid)*3) var(--grid); position:relative; z-index:1}

/* ===== header ===== */
.brand{font:700 .9rem/1 var(--mono); color:var(--muted); letter-spacing:.08em; text-transform:uppercase; margin:0 0 .4rem}
h1{font-family:var(--sans); font-weight:900; letter-spacing:-.02em; margin:.1rem 0; font-size:clamp(2.4rem, 6vw, 4rem)}
.kicker{margin:.35rem 0 1.2rem; color:var(--muted); font:600 .95rem/1.4 var(--sans)}
.rule{
  height:10px; position:relative; margin: 1.2rem 0 2rem; background:#0000;
}
.rule::before{
  content:""; position:absolute; left:0; top:50%; transform:translateY(-50%);
  width: 160px; height: 8px; background: var(--tape); border-radius: 8px;
  box-shadow: 0 2px 0 rgba(0,0,0,.12);
}

/* ===== site nav ===== */
.nav{
  display:flex; flex-wrap:wrap; gap:.5rem 1.6rem; margin:0 0 calc(var(--grid)*2);
  font-family:var(--mono);
}
.nav a{
  text-decoration:none; color:var(--ink); border-bottom:2px solid transparent; padding-bottom:2px;
}
.nav a:hover{border-color:var(--yellow)}
.nav .active{border-color:var(--ink); font-weight:700}

/* ===== layout: sticky index + content ===== */
.grid{
  display:grid; gap: calc(var(--grid)*2);
  grid-template-columns: 220px 1fr;
}
@media (max-width: 860px){ .grid{grid-template-columns:1fr} }

.index{
  position:sticky; top:calc(var(--grid)*2);
  align-self:start; padding-top:.2rem;
  font-family:var(--mono); font-size:.9rem;
}
.index h3{margin:0 0 .6rem; color:var(--muted); font:700 .75rem/1 var(--mono); letter-spacing:.14em; text-transform:uppercase}
.index a{display:block; padding:.35rem 0; text-decoration:none; color:var(--ink)}
.index a::before{
  content:"— "; color:var(--muted)
}
.index a:hover{color:#000}

/* ===== sections ===== */
section{scroll-margin-top:90px}
.sec{
  background:#fff; border:1px solid #e9e9e9; border-radius:var(--radius);
  padding: calc(var(--grid)*1.2) calc(var(--grid)*1.2);
  box-shadow: var(--shadow);
  position:relative;
}
.label{
  display:inline-block; background:var(--yellow); font-family:var(--sans);
  font-weight:800; letter-spacing:.04em; text-transform:uppercase;
  padding:.35em .6em; border-radius:8px;
  margin-bottom:.9rem; font-size:.78rem;
}
h2{
  font-family:var(--sans); font-weight:800; letter-spacing:.02em; margin:.2rem 0 1rem;
  font-size:clamp(1.4rem, 3.2vw, 2rem);
}
p, li{font-size:1rem; line-height:1.75}
ul.clean{padding:0; margin:.6rem 0 0; list-style:none}
ul.clean li{margin:.3rem 0}

/* links with gentle underline grow */
a.inline{
  color:var(--ink); text-decoration:none;
  background-image: linear-gradient(currentColor, currentColor);
  background-position: 0 100%; background-repeat:no-repeat; background-size: 0% 2px; transition: background-size .25s ease;
}
a.inline:hover{background-size: 100% 2px}

/* callouts */
.callout{
  border-left:6px solid var(--tape);
  padding: .2rem 0 .2rem 1rem; margin: 1rem 0 0;
  color:#333;
  font-family:var(--sans); font-weight:600;
}

/* footer */
footer{margin:calc(var(--grid)*3) 0 1rem; color:var(--muted); text-align:center; font:600 .85rem/1.6 var(--mono)}