:root{
  --bg:#0b1020; --panel:#141a32; --ink:#eef2ff; --muted:#9aa3c7;
  --accent:#7aa2ff; --accent2:#ffb86b; --good:#7be3a4; --warn:#ffd166;
  --line:#2a3260;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg);color:var(--ink);
  font-family:"Hiragino Sans","Helvetica Neue",Arial,sans-serif;
  -webkit-font-smoothing:antialiased; overflow:hidden;}
.deck{width:100vw;height:100vh;position:relative;overflow:hidden}
.slide{position:absolute;inset:0;padding:48px 64px;display:none;
  flex-direction:column;gap:24px;animation:fade .25s ease}
.slide.active{display:flex}
@keyframes fade{from{opacity:.0;transform:translateY(8px)}to{opacity:1;transform:none}}
h1.title{font-size:34px;margin:0;letter-spacing:.02em}
h1.title small{display:block;font-size:18px;color:var(--muted);font-weight:400;margin-top:6px}
h2.subtitle{font-size:22px;margin:0;color:var(--accent);font-weight:600}
.lead{font-size:18px;color:var(--muted);max-width:1100px;line-height:1.7}
.grid{display:grid;gap:18px}
.grid.c2{grid-template-columns:1fr 1fr}
.grid.c3{grid-template-columns:repeat(3,1fr)}
.grid.c4{grid-template-columns:repeat(4,1fr)}
.card{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:18px 20px}
.card h3{margin:0 0 10px;font-size:18px;color:var(--accent2)}
.card p,.card li{font-size:16px;line-height:1.7;color:var(--ink)}
.kv{display:grid;grid-template-columns:auto 1fr;gap:6px 16px;font-size:16px}
.kv b{color:var(--muted);font-weight:500}
code,.code{font-family:"SF Mono","Menlo",monospace;font-size:15px;
  background:#0a0e22;border:1px solid var(--line);padding:10px 14px;
  border-radius:8px;display:block;white-space:pre-wrap;line-height:1.6}
.flow{display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.flow .node{flex:1 1 0;min-width:140px;background:var(--panel);
  border:1px solid var(--line);border-radius:12px;padding:14px;font-size:15px}
.flow .arr{color:var(--accent);font-size:24px;font-weight:700}
.tag{display:inline-block;padding:3px 10px;border-radius:999px;
  background:#1d2550;border:1px solid var(--line);font-size:14px;color:var(--accent)}
.bad{color:#ff8a8a}.good{color:var(--good)}.note{color:var(--warn)}
img.fig{max-width:100%;max-height:55vh;border-radius:10px;background:#fff}
.figrow{display:flex;gap:14px;align-items:center;justify-content:center;flex-wrap:wrap}
.figrow figure{margin:0;text-align:center}
.figrow figcaption{font-size:14px;color:var(--muted);margin-top:6px}
.hud{position:fixed;right:14px;bottom:12px;display:flex;gap:10px;align-items:center;
  background:rgba(20,26,50,.7);border:1px solid var(--line);
  padding:6px 12px;border-radius:999px;font-size:14px;color:var(--muted);
  backdrop-filter:blur(6px)}
.hud button{background:transparent;border:0;color:var(--ink);font-size:18px;
  width:32px;height:32px;cursor:pointer;border-radius:50%}
.hud button:hover{background:#1d2550}
.toc{position:fixed;inset:0;background:rgba(8,12,30,.94);display:none;
  align-items:center;justify-content:center;z-index:50;padding:48px;overflow:auto}
.toc.show{display:flex}
.toc ol{max-width:920px;width:100%;background:var(--panel);border:1px solid var(--line);
  border-radius:14px;padding:24px 32px 24px 56px;margin:0;font-size:18px;line-height:2}
.toc li{cursor:pointer;color:var(--ink)}
.toc li:hover{color:var(--accent)}
.tit{position:fixed;left:14px;bottom:12px;color:var(--muted);font-size:13px}
.center{display:grid;place-items:center;flex:1}
table.tbl{border-collapse:collapse;width:100%;font-size:15px;background:var(--panel);
  border-radius:10px;overflow:hidden}
table.tbl th,table.tbl td{padding:10px 12px;border-bottom:1px solid var(--line);
  text-align:left;vertical-align:top}
table.tbl th{background:#1d2550;color:var(--accent);font-weight:600;font-size:14px}
table.tbl tr:last-child td{border-bottom:0}
table.tbl tr.sub td{background:#0f1430;color:var(--accent2);font-weight:600}
table.tbl td.num{text-align:right;font-variant-numeric:tabular-nums}
.bignum{font-size:36px;font-weight:700;color:var(--accent2);line-height:1}
.bignum small{display:block;font-size:14px;color:var(--muted);margin-top:6px;font-weight:400}
.pill{display:inline-block;padding:2px 8px;background:#1d2550;border:1px solid var(--line);
  border-radius:6px;font-size:13px;color:var(--accent);margin-right:6px}
ul.tight{margin:6px 0;padding-left:20px}
ul.tight li{margin:4px 0;font-size:15px;line-height:1.6}
.cover{display:grid;place-items:center;text-align:center;flex:1;gap:18px}
.cover h1{font-size:56px;margin:0;line-height:1.15}
.cover .sub{font-size:22px;color:var(--accent);margin:0}
.cover .meta{font-size:16px;color:var(--muted)}
@media (max-width:780px){
  table.tbl{font-size:13px}
  table.tbl th,table.tbl td{padding:6px 8px}
  .cover h1{font-size:32px}
  .slide{padding:24px 18px}
  h1.title{font-size:24px}
  .grid.c2,.grid.c3,.grid.c4{grid-template-columns:1fr}
  .flow{flex-direction:column}
  .flow .arr{transform:rotate(90deg)}
}