@charset "UTF-8";

:root{
  --navy:#173a5e;
  --navy-deep:#0f2740;
  --accent:#2e8b8b;
  --accent-light:#eaf5f5;
  --bg:#f7f8fa;
  --text:#2b2f36;
  --text-light:#5b6270;
  --border:#e3e6ea;
  --white:#ffffff;
  --warn-bg:#fff8e6;
  --warn-border:#f0d98c;
}

*{box-sizing:border-box;}

body{
  margin:0;
  font-family:"Hiragino Kaku Gothic ProN","Hiragino Sans","Noto Sans JP",Meiryo,sans-serif;
  color:var(--text);
  background:var(--bg);
  line-height:1.9;
  font-size:16px;
  -webkit-text-size-adjust:100%;
}

img{max-width:100%;height:auto;}

a{color:var(--accent);text-decoration:none;}
a:hover{text-decoration:underline;}

.wrap{
  max-width:760px;
  margin:0 auto;
  padding:0 20px;
}

/* header */
.site-header{
  background:var(--navy-deep);
  color:#fff;
  padding:14px 0;
}
.site-header .wrap{
  display:flex;
  align-items:center;
  justify-content:space-between;
  flex-wrap:wrap;
  gap:10px;
}
.site-header .logo{
  color:#fff;
  font-weight:bold;
  font-size:1.05rem;
  letter-spacing:.02em;
}
.site-header .logo span{
  display:block;
  font-size:.72rem;
  font-weight:normal;
  color:#c9d6e4;
}
.header-cta{
  background:var(--accent);
  color:#fff !important;
  padding:9px 16px;
  border-radius:6px;
  font-size:.9rem;
  font-weight:bold;
  white-space:nowrap;
}
.header-cta:hover{background:#256f6f;text-decoration:none;}

/* breadcrumb */
.breadcrumb{
  font-size:.8rem;
  color:var(--text-light);
  padding:12px 0;
}
.breadcrumb a{color:var(--text-light);text-decoration:underline;}
.breadcrumb .sep{margin:0 6px;color:#b7bcc4;}

/* main */
main{
  background:var(--white);
  border:1px solid var(--border);
  border-radius:10px;
  padding:32px 24px;
  margin-bottom:32px;
}

h1{
  font-size:1.55rem;
  line-height:1.5;
  color:var(--navy-deep);
  border-left:6px solid var(--accent);
  padding-left:14px;
  margin:0 0 22px;
}

h2{
  font-size:1.22rem;
  color:var(--navy-deep);
  margin:38px 0 14px;
  padding-bottom:8px;
  border-bottom:2px solid var(--border);
}

h3{
  font-size:1.05rem;
  color:var(--navy);
  margin:24px 0 10px;
}

p{margin:0 0 16px;}

ul,ol{margin:0 0 18px;padding-left:1.4em;}
li{margin-bottom:6px;}

.lead{
  background:var(--accent-light);
  border-radius:8px;
  padding:18px 20px;
  font-size:.98rem;
  color:var(--navy-deep);
  margin-bottom:26px;
}

.conclusion-box{
  background:var(--bg);
  border:1px solid var(--border);
  border-left:5px solid var(--navy);
  border-radius:6px;
  padding:18px 20px;
  margin:20px 0 30px;
}
.conclusion-box .label{
  font-weight:bold;
  color:var(--navy);
  font-size:.85rem;
  margin-bottom:6px;
  display:block;
}

.example-box{
  background:#f4f8f4;
  border:1px dashed #b9d3b9;
  border-radius:8px;
  padding:16px 18px;
  margin:16px 0 26px;
  font-size:.96rem;
}
.example-box .label{
  font-weight:bold;
  color:#3d7a3d;
  font-size:.82rem;
  margin-bottom:6px;
  display:block;
}

.caution-box{
  background:var(--warn-bg);
  border:1px solid var(--warn-border);
  border-radius:8px;
  padding:16px 18px;
  margin:16px 0 26px;
  font-size:.95rem;
}
.caution-box .label{
  font-weight:bold;
  color:#8a6d1a;
  font-size:.82rem;
  margin-bottom:6px;
  display:block;
}

.confirm-flag{
  display:inline-block;
  background:#fdeaea;
  color:#a13a3a;
  font-size:.75rem;
  font-weight:bold;
  border-radius:4px;
  padding:2px 8px;
  margin-left:6px;
}

/* CTA */
.cta-box{
  background:linear-gradient(135deg,var(--navy) 0%,var(--navy-deep) 100%);
  color:#fff;
  border-radius:12px;
  padding:26px 22px;
  margin:36px 0;
  text-align:center;
}
.cta-box h2{
  color:#fff;
  border-bottom:none;
  margin-top:0;
  font-size:1.15rem;
}
.cta-box p{
  color:#e3ecf5;
  font-size:.94rem;
}
.cta-button{
  display:inline-block;
  background:var(--accent);
  color:#fff !important;
  font-weight:bold;
  padding:14px 30px;
  border-radius:30px;
  margin-top:10px;
  font-size:1rem;
}
.cta-button:hover{background:#256f6f;text-decoration:none;}
.cta-note{
  font-size:.78rem;
  color:#c9d6e4;
  margin-top:10px;
}

/* related links */
.related{
  margin-top:36px;
  padding-top:26px;
  border-top:1px solid var(--border);
}
.related h2{
  border-bottom:none;
  margin:0 0 14px;
}
.related ul{
  list-style:none;
  padding:0;
  margin:0;
  display:grid;
  gap:10px;
}
.related li a{
  display:block;
  background:var(--bg);
  border:1px solid var(--border);
  border-radius:8px;
  padding:12px 16px;
  color:var(--navy);
  font-size:.94rem;
}
.related li a:hover{
  border-color:var(--accent);
  text-decoration:none;
  background:var(--accent-light);
}

/* author box */
.author-box{
  display:flex;
  gap:14px;
  align-items:flex-start;
  background:var(--bg);
  border:1px solid var(--border);
  border-radius:10px;
  padding:18px;
  margin:36px 0;
  font-size:.9rem;
}
.author-box .a-name{
  font-weight:bold;
  color:var(--navy-deep);
  margin-bottom:4px;
}
.author-box .a-desc{color:var(--text-light);}

/* footer */
.site-footer{
  background:var(--navy-deep);
  color:#c9d6e4;
  padding:26px 0 40px;
  font-size:.82rem;
  text-align:center;
}
.site-footer a{color:#dce7f2;}
.site-footer .foot-links{margin-bottom:10px;}
.site-footer .foot-links a{margin:0 8px;}
.site-footer .copyright{color:#8fa0b5;margin-top:10px;}

.disclaimer{
  font-size:.78rem;
  color:var(--text-light);
  background:var(--bg);
  border-radius:6px;
  padding:14px 16px;
  margin-top:30px;
}

@media (max-width:600px){
  body{font-size:15px;}
  main{padding:22px 16px;border-radius:0;border-left:none;border-right:none;}
  h1{font-size:1.32rem;}
  h2{font-size:1.1rem;}
  .site-header .logo{font-size:.95rem;}
  .header-cta{font-size:.82rem;padding:8px 12px;}
  .cta-button{width:100%;}
}