*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
img{max-width:100%;display:block}
a{text-decoration:none;color:inherit}
ul,ol{list-style:none}
body{-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
@media (prefers-reduced-motion: reduce){*{animation:none!important;transition:none!important;scroll-behavior:auto!important}}
:focus-visible{outline:3px solid var(--accent);outline-offset:2px}

:root{
  --bg:#f4f7fb;--ink:#182634;--accent:#1f6feb;--accent2:#0b4bb0;--soft:#e9f0fa;
  --line:#d7e2f0;--muted:#5b6b7d;--foot-bg:#12233a;--foot-fg:#e5eef9;
  --ff-disp:'Zen Kaku Gothic New',sans-serif;--ff-body:'Noto Sans JP',sans-serif;
  --maxw:960px;--radius:16px;
}
body{font-family:var(--ff-body);background:var(--bg);color:var(--ink);line-height:1.9;font-size:16px}

/* ===== Header : top bar ===== */
.topbar{position:sticky;top:0;z-index:80;background:rgba(255,255,255,.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.topbar .bar{max-width:1120px;margin:0 auto;padding:0 24px;height:64px;display:flex;align-items:center;gap:24px}
.brand{display:flex;align-items:center;gap:10px;font-family:var(--ff-disp);font-weight:700;font-size:14px;line-height:1.3;color:var(--ink);max-width:520px}
.brand .pin{width:22px;height:22px;border-radius:50%;background:var(--accent);position:relative;flex:0 0 auto;box-shadow:0 0 0 4px var(--soft)}
.brand .pin::after{content:"";position:absolute;inset:7px;border-radius:50%;background:#fff}
.mainnav{margin-left:auto}
.mainnav ul{display:flex;gap:4px}
.mainnav a{display:block;padding:8px 14px;border-radius:8px;font-size:14px;font-weight:500;color:var(--muted);transition:.2s}
.mainnav a:hover{color:var(--accent);background:var(--soft)}
.mainnav li.is-active a{color:var(--accent);background:var(--soft);font-weight:700}
.burger{display:none;width:42px;height:42px;background:none;border:none;cursor:pointer;flex-direction:column;justify-content:center;gap:5px;padding:8px;margin-left:auto;color:var(--ink)}
.burger span{display:block;height:2px;background:currentColor;transition:.3s}
.burger[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.burger[aria-expanded="true"] span:nth-child(2){opacity:0}
.burger[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
.drawer{display:none}

/* ===== Home hero ===== */
.hero{position:relative;overflow:hidden;background:linear-gradient(135deg,#12233a 0%,#1f6feb 130%);color:#fff}
.hero .hero-in{max-width:var(--maxw);margin:0 auto;padding:96px 24px 104px;position:relative;z-index:2}
.hero .k{font-family:var(--ff-disp);letter-spacing:.28em;font-size:12px;color:#9fc3ff;margin-bottom:18px}
.hero h1{font-family:var(--ff-disp);font-weight:700;font-size:clamp(30px,5.4vw,50px);line-height:1.35;margin-bottom:22px}
.hero p{color:#d3e3fb;max-width:52ch;line-height:2}
.hero .rings{position:absolute;right:-120px;top:-80px;width:420px;height:420px;border-radius:50%;border:1px solid rgba(255,255,255,.16);z-index:1}
.hero .rings::before,.hero .rings::after{content:"";position:absolute;border-radius:50%;border:1px solid rgba(255,255,255,.16)}
.hero .rings::before{inset:60px}
.hero .rings::after{inset:130px;background:radial-gradient(circle,rgba(159,195,255,.35),transparent 70%)}

/* ===== Home cards ===== */
.cards{max-width:var(--maxw);margin:-56px auto 0;padding:0 24px 90px;position:relative;z-index:5;display:grid;grid-template-columns:1fr 1fr;gap:20px}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px 26px;box-shadow:0 20px 44px -30px rgba(24,38,52,.5);transition:.25s;display:block}
.card:hover{transform:translateY(-4px);border-color:var(--accent);box-shadow:0 26px 50px -28px rgba(31,111,235,.4)}
.card .no{font-family:var(--ff-disp);font-weight:700;font-size:13px;color:var(--accent);letter-spacing:.1em;margin-bottom:10px}
.card h3{font-family:var(--ff-disp);font-weight:700;font-size:19px;margin-bottom:8px}
.card p{color:var(--muted);font-size:14.5px;line-height:1.85}
.card .arw{color:var(--accent);font-weight:700;font-size:14px;margin-top:14px;display:inline-block}
@media(max-width:760px){.cards{grid-template-columns:1fr}}

/* ===== Sub-page ===== */
.page-main{max-width:var(--maxw);margin:0 auto;padding:64px 24px 88px}
.page-head{margin-bottom:40px;padding-bottom:28px;border-bottom:2px solid var(--line)}
.eyebrow{font-family:var(--ff-disp);letter-spacing:.24em;font-size:12px;color:var(--accent);text-transform:uppercase;margin-bottom:14px}
.page-head h1{font-family:var(--ff-disp);font-weight:700;font-size:clamp(26px,4.6vw,40px);line-height:1.3;margin-bottom:16px}
.lead{color:var(--muted);font-size:17px;max-width:62ch}
.block{margin:0 0 46px}
.block h2{font-family:var(--ff-disp);font-weight:700;font-size:clamp(20px,3.2vw,27px);margin-bottom:16px;padding-left:16px;border-left:5px solid var(--accent)}
.block h3{font-family:var(--ff-disp);font-weight:700;font-size:19px;margin:26px 0 12px;color:var(--accent2)}
.block p{margin-bottom:15px}
.block.has-img{display:grid;grid-template-columns:1.2fr .9fr;gap:36px;align-items:center}
.block.has-img h2{border-left:none;padding-left:0}
.block-fig img{border-radius:var(--radius);width:100%;aspect-ratio:4/3;object-fit:cover;box-shadow:0 18px 40px -24px rgba(24,38,52,.5)}
@media(max-width:760px){.block.has-img{grid-template-columns:1fr;gap:20px}}

/* prev / next pager */
.pager{display:flex;justify-content:space-between;gap:14px;margin-top:56px;padding-top:28px;border-top:1px solid var(--line)}
.pager a{flex:1;background:#fff;border:1px solid var(--line);border-radius:12px;padding:16px 20px;transition:.2s;max-width:48%}
.pager a:hover{border-color:var(--accent);background:var(--soft)}
.pager small{display:block;font-size:12px;color:var(--muted);margin-bottom:4px}
.pager span{font-family:var(--ff-disp);font-weight:700;font-size:14.5px;color:var(--ink)}
.pager .next{text-align:right;margin-left:auto}
.pager .empty{visibility:hidden}
@media(max-width:520px){.pager span{font-size:13px}}

/* ===== Sitemap : list ===== */
.sitemap-list{border-top:1px solid var(--line)}
.sitemap-list li{border-bottom:1px solid var(--line)}
.sitemap-list a{display:block;padding:24px 8px;transition:.2s}
.sitemap-list a:hover{background:var(--soft);padding-left:18px}
.sitemap-list .st-ttl{font-family:var(--ff-disp);font-weight:700;font-size:18px;color:var(--accent2);display:flex;align-items:center;gap:10px;margin-bottom:6px}
.sitemap-list .st-ttl::before{content:"\203A";color:var(--accent);font-size:22px}
.sitemap-list .st-desc{color:var(--muted);font-size:14.5px;line-height:1.8;padding-left:20px}

/* ===== Footer ===== */
.site-footer{background:var(--foot-bg);color:var(--foot-fg);margin-top:80px}
.site-footer .ft-in{max-width:var(--maxw);margin:0 auto;padding:56px 24px 24px;display:grid;grid-template-columns:1.5fr 1fr;gap:34px}
.site-footer .ft-name{font-family:var(--ff-disp);font-weight:700;font-size:16px;line-height:1.4;margin-bottom:8px;display:flex;align-items:center;gap:9px}
.site-footer .ft-name .pin{width:20px;height:20px;border-radius:50%;background:var(--accent);position:relative;flex:0 0 auto}
.site-footer .ft-name .pin::after{content:"";position:absolute;inset:6px;border-radius:50%;background:var(--foot-bg)}
.site-footer .ft-tag{opacity:.7;font-size:14px}
.site-footer ul{display:flex;flex-direction:column;gap:10px;font-size:14px}
.site-footer a{color:inherit;opacity:.82;transition:.2s}
.site-footer a:hover{opacity:1;color:#9fc3ff}
.site-footer .ft-copy{grid-column:1/-1;text-align:center;font-size:12px;opacity:.55;padding-top:22px;border-top:1px solid rgba(255,255,255,.12)}
@media(max-width:760px){.site-footer .ft-in{grid-template-columns:1fr;gap:24px}}

/* ===== shared ===== */
.to-top{position:fixed;right:20px;bottom:20px;width:46px;height:46px;border-radius:50%;background:var(--accent);color:#fff;display:flex;align-items:center;justify-content:center;font-size:20px;opacity:0;pointer-events:none;transform:translateY(12px);transition:.3s;z-index:60;box-shadow:0 8px 20px -8px rgba(0,0,0,.5)}
.to-top.show{opacity:1;pointer-events:auto;transform:none}
.reveal{opacity:0;transform:translateY(26px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:none}

@media(max-width:820px){
  .mainnav{display:none}
  .burger{display:flex}
  .drawer.open{display:block;position:fixed;top:64px;left:0;right:0;background:#fff;border-bottom:1px solid var(--line);z-index:79}
  .drawer.open ul{flex-direction:column;padding:8px 16px 14px}
  .drawer.open li{padding:11px 4px;border-top:1px solid var(--line)}
  .drawer.open a{color:var(--ink);font-weight:500}
  .cards{margin-top:-40px}
}