*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:"Hiragino Sans","Hiragino Kaku Gothic ProN","Noto Sans JP",Meiryo,sans-serif;
  line-height:1.75;
  color:#1a1a1a;
  background:#f5f6f8;
  max-width:920px;
  margin:0 auto;
  padding:1.5rem;
}
header{
  background:linear-gradient(135deg,#1e3a5f 0%,#2c5aa0 50%,#3a7bd5 100%);
  color:#fff;
  padding:2.5rem 2rem;
  border-radius:10px;
  margin-bottom:1.8rem;
  text-align:center;
  box-shadow:0 4px 12px rgba(0,0,0,.12);
}
header h1{
  font-size:2.6rem;
  margin-bottom:.4rem;
  letter-spacing:.06em;
  font-weight:700;
}
header .subtitle{
  font-size:1.15rem;
  opacity:.92;
  margin-bottom:.8rem;
}
header .version{
  font-size:.85rem;
  opacity:.75;
}
nav{
  background:#fff;
  border:1px solid #dde1e6;
  border-radius:8px;
  padding:1rem 1.2rem;
  margin-bottom:1.8rem;
  display:flex;
  flex-wrap:wrap;
  gap:.6rem;
  justify-content:center;
  box-shadow:0 1px 3px rgba(0,0,0,.04);
}
nav a{
  color:#1a5276;
  text-decoration:none;
  padding:.45rem .9rem;
  border-radius:5px;
  font-size:.95rem;
  transition:background .15s,color .15s;
}
nav a:hover{
  background:#e8f0fe;
  color:#0d3b66;
}
section{
  background:#fff;
  border:1px solid #e2e5ea;
  border-radius:8px;
  padding:1.8rem 1.6rem;
  margin-bottom:1.6rem;
  box-shadow:0 1px 4px rgba(0,0,0,.03);
}
h2{
  font-size:1.45rem;
  color:#1e3a5f;
  border-bottom:2.5px solid #3a7bd5;
  padding-bottom:.45rem;
  margin-bottom:1.2rem;
}
h3{
  font-size:1.18rem;
  color:#2c3e50;
  margin:1.4rem 0 .7rem;
  padding-left:.6rem;
  border-left:3px solid #3a7bd5;
}
h4{
  font-size:1.05rem;
  color:#34495e;
  margin:1.1rem 0 .5rem;
}
p{
  margin-bottom:1rem;
}
ul,ol{
  margin:0 0 1.1rem 1.5rem;
}
li{
  margin-bottom:.4rem;
}
a{
  color:#1a6fb5;
  text-decoration:none;
}
a:hover{
  color:#0d4a7a;
  text-decoration:underline;
}
.meta{
  color:#6b7280;
  font-size:.9rem;
}
.card{
  background:#f8fafc;
  border-left:4px solid #3a7bd5;
  padding:1.1rem 1.2rem;
  margin:1.1rem 0;
  border-radius:0 6px 6px 0;
}
.card-warn{
  border-left-color:#e74c3c;
  background:#fef5f5;
}
.card-info{
  border-left-color:#27ae60;
  background:#f0faf4;
}
.card-note{
  border-left-color:#f39c12;
  background:#fffbf0;
}
.grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(210px,1fr));
  gap:1rem;
  margin:1.2rem 0;
}
.grid-item{
  background:#f1f5f9;
  padding:1.1rem;
  border-radius:6px;
  text-align:center;
  border:1px solid #e2e8f0;
}
.grid-item strong{
  display:block;
  font-size:1.5rem;
  color:#1a6fb5;
  margin-bottom:.3rem;
}
footer{
  text-align:center;
  padding:2.2rem 0 1rem;
  color:#8b95a5;
  font-size:.88rem;
  border-top:1px solid #dde1e6;
  margin-top:2rem;
}
.tag{
  display:inline-block;
  background:#3a7bd5;
  color:#fff;
  padding:.18rem .55rem;
  border-radius:4px;
  font-size:.78rem;
  margin:.15rem .2rem .15rem 0;
}
.progress{
  background:#e8eef5;
  border-radius:5px;
  height:14px;
  margin:.4rem 0 1.1rem;
  overflow:hidden;
}
.progress-bar{
  background:linear-gradient(90deg,#3a7bd5,#5b9bd5);
  height:100%;
  border-radius:5px;
}
table{
  width:100%;
  border-collapse:collapse;
  margin:1.1rem 0;
  font-size:.93rem;
}
th,td{
  border:1px solid #dde1e6;
  padding:.65rem .8rem;
  text-align:left;
}
th{
  background:#eef2f7;
  font-weight:600;
  color:#1e3a5f;
}
tr:nth-child(even){
  background:#f8fafc;
}
blockquote{
  border-left:4px solid #a0aec0;
  padding:.8rem 0 .8rem 1.2rem;
  margin:1.2rem 0;
  color:#4a5568;
  background:#f7fafc;
  border-radius:0 4px 4px 0;
}
.badge{
  display:inline-block;
  background:#e74c3c;
  color:#fff;
  font-size:.72rem;
  padding:.12rem .45rem;
  border-radius:10px;
  vertical-align:middle;
  margin-left:.3rem;
}
hr{
  border:none;
  border-top:1px solid #e8e8e8;
  margin:1.6rem 0;
}
code{
  background:#edf2f7;
  padding:.12rem .4rem;
  border-radius:3px;
  font-family:"SFMono-Regular",Consolas,monospace;
  font-size:.88em;
}
pre{
  background:#1e293b;
  color:#e2e8f0;
  padding:1.1rem 1.2rem;
  border-radius:6px;
  overflow-x:auto;
  font-size:.85rem;
  margin:1.1rem 0;
  line-height:1.55;
}
.timeline{
  border-left:3px solid #3a7bd5;
  padding-left:1.4rem;
  margin:1.2rem 0;
}
.timeline-item{
  position:relative;
  margin-bottom:1.4rem;
  padding-bottom:.3rem;
}
.timeline-item::before{
  content:"";
  position:absolute;
  left:-1.62rem;
  top:.45rem;
  width:11px;
  height:11px;
  background:#3a7bd5;
  border-radius:50%;
  border:2px solid #fff;
  box-shadow:0 0 0 2px #3a7bd5;
}
.btn{
  display:inline-block;
  background:#3a7bd5;
  color:#fff !important;
  padding:.55rem 1.3rem;
  border-radius:5px;
  text-decoration:none !important;
  margin:.25rem .3rem .25rem 0;
  transition:background .15s;
  font-size:.95rem;
}
.btn:hover{
  background:#2c5aa0;
}
.btn-secondary{
  background:#64748b;
}
.btn-secondary:hover{
  background:#475569;
}
.btn-outline{
  background:transparent;
  color:#3a7bd5 !important;
  border:1.5px solid #3a7bd5;
}
.btn-outline:hover{
  background:#e8f0fe;
}
.two-col{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:1.2rem;
  margin:1rem 0;
}
@media (max-width:640px){
  body{padding:1rem}
  header h1{font-size:1.9rem}
  nav{flex-direction:column;align-items:stretch}
  nav a{text-align:center}
  .two-col{grid-template-columns:1fr}
  .grid{grid-template-columns:1fr}
}
.list-check li::marker{content:"✓ ";color:#27ae60}
.list-cross li::marker{content:"✗ ";color:#e74c3c}
.section-num{
  display:inline-block;
  background:#1e3a5f;
  color:#fff;
  width:1.7rem;
  height:1.7rem;
  line-height:1.7rem;
  text-align:center;
  border-radius:50%;
  font-size:.85rem;
  margin-right:.5rem;
  vertical-align:middle;
}
.def-list{
  margin:1rem 0;
}
.def-list dt{
  font-weight:600;
  color:#1e3a5f;
  margin-top:.8rem;
}
.def-list dd{
  margin-left:1.2rem;
  color:#4a5568;
}
.highlight{
  background:#fff3cd;
  padding:.1rem .35rem;
  border-radius:3px;
}
/* 分割ページ用 */
nav a[aria-current="page"]{
  background:#e8f0fe;
}
.pager{
  display:flex;
  flex-wrap:wrap;
  gap:1rem;
  margin:2rem 0;
}
.pager a{
  flex:1 1 240px;
  background:#fff;
  border:1px solid #dde1e6;
  border-radius:8px;
  padding:1.1rem 1.2rem;
  box-shadow:0 1px 3px rgba(0,0,0,.04);
}
.pager a:hover{
  border-color:#3a7bd5;
  background:#fff;
  text-decoration:none;
}
.pager strong{
  display:block;
  color:#1e3a5f;
  margin-bottom:.3rem;
}
.pager span{
  color:#6b7280;
  font-size:.9rem;
}
.toc{
  margin:0 0 1.4rem 1.4rem;
  font-size:.92rem;
}
.toc li{
  margin-bottom:.2rem;
}
@media print{
  nav,.pager{display:none}
}
img{
  max-width:100%;
  height:auto;
}