:root {
  --bg: #0b0e13;
  --bg-2: #10151c;
  --panel: #141b24;
  --line: #1f2933;
  --ink: #dde5ee;
  --muted: #8a97a6;
  --dim: #808d9e;
  --accent: #4fd1c5;      /* signal teal */
  --accent-2: #f6ad55;    /* amber */
  --good: #4fd1c5;
  --warn: #f6ad55;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(79,209,197,0.06), transparent 60%),
    var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
@keyframes rise { from { opacity: 0; transform: translateY(16px); } to { opacity: 1; transform: none; } }
@media (prefers-reduced-motion: reduce) { * { animation: none !important; transition: none !important; } }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
code { font-family: var(--mono); background: var(--bg-2); padding: 1px 5px; border-radius: 4px; font-size: 0.85em; color: var(--muted); }

/* header */
.top {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 22px;
  background: rgba(11,14,19,0.82); backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: baseline; gap: 8px; font-family: var(--mono); }
.brand .dot { width: 9px; height: 9px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 10px var(--accent); align-self: center; }
.brand-name { letter-spacing: 3px; font-weight: 700; }
.brand-sub { color: var(--dim); font-size: 0.82rem; letter-spacing: 1px; }
.controls { display: flex; align-items: center; gap: 16px; }
.toggle { display: flex; align-items: center; gap: 8px; font-size: 0.85rem; color: var(--muted); cursor: pointer; user-select: none; font-family: var(--mono); }
.toggle input { accent-color: var(--accent); width: 16px; height: 16px; }
.ghost { font-family: var(--mono); font-size: 0.82rem; color: var(--muted); border: 1px solid var(--line); padding: 5px 11px; border-radius: 6px; }
.ghost:hover { color: var(--ink); border-color: var(--accent); text-decoration: none; }

/* hero */
.hero { max-width: 980px; margin: 0 auto; padding: 64px 22px 24px; }
.hero h1 { font-size: clamp(2rem, 5.4vw, 3.4rem); line-height: 1.06; margin: 0 0 18px; letter-spacing: -0.035em; animation: rise 0.8s cubic-bezier(0.16,1,0.3,1) both; }
.subhead { font-size: 1.24rem; color: var(--ink); max-width: 60ch; margin: 0 0 22px; line-height: 1.36; letter-spacing: -0.01em; animation: rise 0.8s cubic-bezier(0.16,1,0.3,1) 0.05s both; }
.subhead strong { color: var(--accent); }
.lede { font-size: 1.08rem; color: var(--muted); max-width: 70ch; margin: 0 0 26px; animation: rise 0.8s cubic-bezier(0.16,1,0.3,1) 0.09s both; }
.lede strong { color: var(--ink); }
.lede em { color: var(--accent); font-style: normal; }

.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-bottom: 26px; animation: rise 0.8s cubic-bezier(0.16,1,0.3,1) 0.17s both; }
.stat { background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 16px; }
.stat .v { font-family: var(--mono); font-size: 1.5rem; font-weight: 700; color: var(--accent); }
.stat .l { font-size: 0.78rem; color: var(--dim); text-transform: uppercase; letter-spacing: 0.06em; margin-top: 4px; }
.scope { font-family: var(--mono); font-size: 0.8rem; color: var(--dim); margin: -6px 0 26px; animation: rise 0.8s cubic-bezier(0.16,1,0.3,1) 0.22s both; }
.scope a { color: var(--muted); }
.scope a:hover { color: var(--accent); }

/* teach blocks */
.teach { position: relative; background: rgba(79,209,197,0.045); border: 1px solid rgba(79,209,197,0.16); border-radius: 12px; padding: 15px 17px; margin: 0 0 18px; }
.teach::before { content: "plain english"; position: absolute; top: -8px; left: 14px; font-family: var(--mono); font-size: 0.62rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--accent); background: var(--bg); padding: 0 7px; }
.teach.small::before { content: "read this"; }
.hero-teach::before { content: "start here"; }
.teach h4 { margin: 2px 0 6px; font-size: 0.82rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--accent); }
.teach p { margin: 0; color: #b9c4d0; font-size: 0.98rem; }
.teach.small { margin-top: 10px; padding: 10px 12px; }
.teach.small p, .teach.small { font-size: 0.85rem; }
.hero-teach { max-width: 72ch; }
body.no-eli5 .teach { display: none; }

/* blocks */
main { max-width: 1180px; margin: 0 auto; padding: 20px 22px 40px; }
.block { padding: 34px 0; border-top: 1px solid var(--line); }
.block-head { margin-bottom: 16px; }
.block-head h2 { font-size: 1.5rem; margin: 0; letter-spacing: -0.01em; }
.block-head .tag { margin: 4px 0 0; color: var(--dim); font-family: var(--mono); font-size: 0.85rem; }

.grid { display: grid; grid-template-columns: 1.05fr 1fr; gap: 24px; align-items: start; }
@media (max-width: 900px) { .grid { grid-template-columns: 1fr; } .stats { grid-template-columns: repeat(2,1fr); } }
@media (max-width: 640px) {
  .rh { flex-direction: column; align-items: flex-start; gap: 2px; }
  .row .rk { text-align: left; }
  .cite, .rlink { white-space: normal; }
  .row .rv, .row .rl { overflow-wrap: anywhere; }
}
@media (max-width: 560px) { .brand-sub { display: none; } .hero { padding-top: 44px; } .stat .v { font-size: 1.3rem; } .hero h1 { font-size: 2rem; } }

/* result rows */
.rows { display: flex; flex-direction: column; gap: 10px; }
.rows.wide { }
.row { background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 14px 16px; }
.row .rh { display: flex; align-items: baseline; justify-content: space-between; gap: 10px; margin-bottom: 4px; }
.row .rl { font-weight: 700; font-size: 0.98rem; }
.row .rk { font-family: var(--mono); font-size: 0.78rem; color: var(--accent-2); text-align: right; }
.row .rv { color: var(--muted); font-size: 0.92rem; }
.row .rv strong { color: var(--ink); }
.row .rlinks { display: flex; flex-wrap: wrap; gap: 7px 15px; margin-top: 10px; padding-top: 9px; border-top: 1px solid var(--line); }
.rlink { font-family: var(--mono); font-size: 0.72rem; color: var(--dim); white-space: nowrap; }
.rlink:hover { color: var(--accent); text-decoration: none; }
.rlink.data { color: rgba(246,173,85,0.8); }
.rlink.data:hover { color: var(--accent-2); }
.cite { font-family: var(--mono); font-size: 0.75rem; color: var(--accent); font-weight: 600; white-space: nowrap; }
.cite:hover { text-decoration: none; opacity: 0.82; }

.built { font-size: 1rem; color: var(--muted); max-width: 70ch; margin: -12px 0 28px; animation: rise 0.8s cubic-bezier(0.16,1,0.3,1) 0.12s both; }
.built a { color: var(--ink); border-bottom: 1px solid var(--line); }
.built a:hover { color: var(--accent); border-color: var(--accent); text-decoration: none; }

/* inline glossary term + tooltip box */
.term { border-bottom: 1px dotted rgba(79,209,197,0.55); cursor: help; }
.term:hover { border-bottom-color: var(--accent); color: var(--ink); }
.tip { position: absolute; z-index: 60; max-width: 320px; background: var(--bg-2); border: 1px solid rgba(79,209,197,0.5); border-radius: 10px; padding: 12px 14px; font-size: 0.85rem; line-height: 1.5; color: var(--muted); box-shadow: 0 12px 34px rgba(0,0,0,0.55); pointer-events: none; }
.tip b { display: block; color: var(--accent); font-family: var(--mono); font-size: 0.76rem; letter-spacing: 0.04em; margin-bottom: 6px; }

/* charts */
.cards { display: flex; flex-direction: column; gap: 18px; }
.chart { margin: 0; background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 16px; }
.chart figcaption { font-size: 0.82rem; color: var(--muted); font-family: var(--mono); margin-bottom: 10px; letter-spacing: 0.02em; }
.chart canvas { max-height: 240px; }
.plate img { display: block; width: 100%; border-radius: 8px; background: #fff; }
.plate figcaption { margin-bottom: 0; margin-top: 11px; }

/* sources */
.sources { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px,1fr)); gap: 12px; }
.src { display: block; background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 14px 16px; }
.src:hover { border-color: var(--accent); text-decoration: none; }
.src .st { color: var(--ink); font-weight: 600; font-size: 0.95rem; }
.src .sm { color: var(--dim); font-family: var(--mono); font-size: 0.78rem; margin-top: 4px; }
.src .sd { color: var(--muted); font-size: 0.85rem; margin-top: 6px; }
.src .badge { display: inline-block; font-family: var(--mono); font-size: 0.7rem; color: var(--accent); border: 1px solid var(--line); border-radius: 4px; padding: 1px 6px; margin-bottom: 8px; }

/* methods glossary */
.methods { display: grid; grid-template-columns: repeat(auto-fill, minmax(324px, 1fr)); gap: 14px; }
.method { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 18px; }
.method .mt { font-weight: 700; font-size: 1.02rem; color: var(--ink); letter-spacing: -0.01em; }
.method .mtldr { color: var(--accent); font-size: 0.9rem; margin-top: 4px; }
.method .mb { color: var(--muted); font-size: 0.9rem; margin-top: 11px; }
.method .mp { display: inline-block; margin-top: 13px; font-family: var(--mono); font-size: 0.74rem; color: var(--dim); }
.method .mp:hover { color: var(--accent); text-decoration: none; }

/* footer */
.foot { border-top: 1px solid var(--line); padding: 26px 22px 50px; text-align: center; color: var(--muted); font-size: 0.9rem; }
.foot .muted { color: var(--dim); font-size: 0.82rem; margin-top: 6px; }
.identity { display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: 12px 26px; margin-bottom: 14px; }
.who { text-align: left; }
.who strong { color: var(--ink); font-size: 1.05rem; display: block; }
.who span { color: var(--dim); font-size: 0.88rem; }
.cta { display: flex; flex-wrap: wrap; gap: 8px; }
.cta a { font-family: var(--mono); font-size: 0.82rem; color: var(--muted); border: 1px solid var(--line); border-radius: 6px; padding: 6px 13px; }
.cta a:hover { color: var(--ink); border-color: var(--accent); text-decoration: none; }