:root{
  --blue:#1f5fa9;
  --blue-dark:#173f70;
  --text:#243444;
  --muted:#5f7388;
  --bg:#f4f7fb;
  --card:#ffffff;
  --line:#d8e2ef;
}
*{box-sizing:border-box}
body{margin:0;font-family:Arial, Helvetica, sans-serif;color:var(--text);background:var(--bg);line-height:1.72}
a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:underline}
.header{background:#fff;border-bottom:1px solid var(--line)}
.topbar{max-width:1200px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;gap:20px;padding:16px 20px}
.brand{display:flex;align-items:center;gap:16px}
.brand img.logo{width:180px;height:auto}
.brand .tag{color:var(--muted);font-size:14px}
.menu{background:#111}
.menu-inner{max-width:1200px;margin:0 auto;display:flex;gap:26px;padding:12px 20px;white-space:nowrap;overflow:auto}
.menu-inner a{color:#fff;font-size:14px;font-weight:bold}
.hero{background:linear-gradient(135deg,#eef5fd,#ffffff);border-bottom:1px solid var(--line)}
.hero-inner{max-width:1200px;margin:0 auto;padding:28px 20px 26px;display:grid;grid-template-columns:1.5fr .9fr;gap:28px;align-items:center}
.hero h1{margin:0 0 12px;font-size:34px;line-height:1.18;color:var(--blue-dark)}
.hero p.lead{margin:0;font-size:18px;color:var(--text)}
.hero .visual{text-align:right}
.hero .visual img{max-width:320px;width:100%;height:auto}
.wrap{max-width:1200px;margin:0 auto;padding:28px 20px 40px}
.main{display:grid;grid-template-columns:minmax(0,1fr) 330px;gap:28px;align-items:start}
.content,.sidebar .box,.home-grid .card,.toc,.notice{background:var(--card);border:1px solid var(--line);border-radius:14px;box-shadow:0 6px 18px rgba(31,95,169,.05)}
.content{padding:28px 30px}
.content h2{font-size:24px;line-height:1.25;color:var(--blue);border-left:6px solid #b9d0ea;padding-left:12px;margin:34px 0 14px}
.content p{margin:0 0 18px;font-size:17px}
.content .closing{font-weight:600;color:#314354}
.kicker{display:inline-block;font-size:12px;letter-spacing:.07em;text-transform:uppercase;color:var(--blue);background:#eaf2fc;border:1px solid #cbdcf2;padding:7px 10px;border-radius:999px;margin-bottom:12px}
.meta-note{color:var(--muted);font-size:14px}
.sidebar{display:flex;flex-direction:column;gap:18px}
.sidebar .box{padding:18px 18px 14px}
.sidebar h3{margin:0 0 10px;color:var(--blue-dark);font-size:19px}
.sidebar ul{margin:0;padding-left:18px}
.sidebar li{margin:0 0 10px;color:var(--text)}
.notice{padding:18px 20px;margin:0 0 24px}
.notice p:last-child,.content p:last-child{margin-bottom:0}
.home-intro{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:26px 28px;box-shadow:0 6px 18px rgba(31,95,169,.05);margin-bottom:28px}
.home-intro h2{margin:28px 0 12px;font-size:26px;color:var(--blue);border-left:6px solid #b9d0ea;padding-left:12px}
.home-intro p{margin:0 0 16px;font-size:17px}
.home-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}
.home-grid .card{padding:18px 18px 16px}
.home-grid h3{margin:0 0 10px;font-size:22px;line-height:1.25}
.home-grid p{margin:0 0 10px;color:var(--text)}
.home-grid .small{color:var(--muted);font-size:14px}
.toc{padding:18px 20px;margin-top:28px}
.toc h2{margin:0 0 10px;font-size:24px;color:var(--blue-dark)}
.toc ul{margin:0;padding-left:18px;columns:2}
.toc li{margin:0 0 10px}
.callout{background:#f7fbff;border:1px solid #d9e7f6;padding:14px 16px;border-radius:12px;margin:0 0 18px}
.footer{border-top:1px solid var(--line);background:#fff;margin-top:10px}
.footer-inner{max-width:1200px;margin:0 auto;padding:18px 20px 24px;color:var(--muted);font-size:14px}
@media (max-width: 980px){.hero-inner,.main{grid-template-columns:1fr}.hero .visual{text-align:left}.home-grid{grid-template-columns:1fr}.toc ul{columns:1}}
/* one-line menu override */
.nav,.topnav,.main-nav,.navbar,.menu,ul.menu,.menu ul,.nav ul{display:flex !important;flex-wrap:nowrap !important;align-items:center;justify-content:flex-start;gap:6px;overflow-x:auto;overflow-y:hidden;white-space:nowrap;-webkit-overflow-scrolling:touch;scrollbar-width:thin}.nav a,.topnav a,.main-nav a,.navbar a,.menu a,.menu ul a,.nav ul a{display:block;white-space:nowrap;flex:0 0 auto;padding:10px 14px}.nav li,.topnav li,.main-nav li,.navbar li,.menu li,.nav ul li,.menu ul li{flex:0 0 auto;list-style:none}.menu,.topnav,.main-nav,.navbar{background:#111827}.menu a,.topnav a,.main-nav a,.navbar a{color:#fff;text-decoration:none}.menu a:hover,.topnav a:hover,.main-nav a:hover,.navbar a:hover{background:rgba(255,255,255,.08);text-decoration:none}.nav::-webkit-scrollbar,.topnav::-webkit-scrollbar,.main-nav::-webkit-scrollbar,.navbar::-webkit-scrollbar,.menu::-webkit-scrollbar,.menu ul::-webkit-scrollbar{height:4px}.nav::-webkit-scrollbar-thumb,.topnav::-webkit-scrollbar-thumb,.main-nav::-webkit-scrollbar-thumb,.navbar::-webkit-scrollbar-thumb,.menu::-webkit-scrollbar-thumb,.menu ul::-webkit-scrollbar-thumb{background:#94a3b8;border-radius:999px}