:root{
  --main:#009490;--main-soft:#dff1f0;--main-deep:#007e7a;
  --accent:#ea6e8e;--accent-soft:#fbe5eb;
  --bg1:#f4f6f8;
  --ink:#1a232e;
  --gray:#5a6573;--line:#e1e6ea
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:"Hiragino Kaku Gothic ProN","Yu Gothic",sans-serif;color:var(--ink);background:#fff;line-height:1.95;font-feature-settings:"palt";-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}

/* NAV */
.nav{position:sticky;top:0;background:#fff;z-index:100;transition:box-shadow .3s,border-color .3s;border-bottom:1px solid transparent}
.nav.scrolled{box-shadow:0 4px 18px -8px rgba(20,40,40,.18);border-bottom-color:var(--line)}
.nav-in{max-width:1280px;margin:0 auto;padding:18px 32px;display:flex;justify-content:space-between;align-items:center;gap:32px}
.logo img{height:52px}
.nav-r{display:flex;align-items:center;gap:36px;margin-left:auto}
.menu{display:flex;gap:36px;font-size:14px;font-weight:600;letter-spacing:.03em}
.menu a{position:relative;padding:6px 0 8px}
.menu a::before{content:"";position:absolute;left:0;right:0;bottom:0;height:1.5px;background:var(--main);opacity:.45}
.menu a:hover{color:var(--main)}
.menu a.current{color:var(--main)}
.menu a.current::before{opacity:1}
.cta-nav{background:var(--main);color:#fff;padding:13px 28px;border-radius:999px;font-size:12.5px;font-weight:700;box-shadow:0 6px 16px -8px rgba(0,148,144,.45)}

.crumb{max-width:1280px;margin:0 auto;padding:18px 32px 0;font-size:11.5px;color:var(--gray)}
.crumb span{margin:0 8px;opacity:.5}

/* Article */
.article{max-width:840px;margin:0 auto;padding:32px 32px 96px}
.a-head{border-bottom:1px solid var(--line);padding-bottom:28px;margin-bottom:32px}
.a-meta{display:flex;align-items:center;gap:12px;margin-bottom:16px}
.a-date{font-size:12.5px;font-weight:800;color:var(--gray);letter-spacing:.06em}
.a-cat{font-size:10.5px;font-weight:800;padding:5px 12px;letter-spacing:.06em;border-radius:2px;color:#0e6ea8;background:#d8ecf9}
.a-title{font-size:clamp(24px,3vw,32px);font-weight:900;line-height:1.4;letter-spacing:.01em}
.a-body p{margin-bottom:16px;font-size:14.5px;line-height:2.05;color:var(--ink)}
.a-body h3{font-size:16px;font-weight:800;color:var(--main-deep);margin:20px 0 2px;letter-spacing:.02em;line-height:1.5}
.a-body h3 + p, .a-body h3 + .co-info{margin-top:0}
.a-body .co-info{padding:8px 0;margin:14px 0}
.a-body .co-info dl{display:grid;grid-template-columns:110px 1fr;row-gap:8px;column-gap:16px;font-size:13.5px}
.a-body .co-info dt{color:var(--gray);font-weight:700}
.a-body .co-info dd{color:var(--ink)}
.a-body .co-info a{color:var(--main-deep);border-bottom:1px solid var(--main-deep);padding-bottom:1px}

.a-foot{display:flex;justify-content:space-between;align-items:center;margin-top:48px;padding-top:24px;border-top:1px solid var(--line);font-size:13px}
.a-back{color:var(--main);font-weight:700;display:inline-flex;align-items:center;gap:6px}
.a-back:hover{color:var(--main-deep)}

/* Footer */
footer{background:var(--bg1);padding:56px 32px 28px;margin-top:80px}
.f-in{max-width:1280px;margin:0 auto;display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:start}
.f-l img{height:38px;margin-bottom:14px}
.f-d{font-size:12px;color:var(--gray);line-height:1.85}
.f-links-wrap{display:flex;flex-direction:column;gap:12px}
.f-links-label{font-size:11px;letter-spacing:.15em;color:var(--gray);font-weight:800}
.f-links{display:grid;grid-template-columns:1fr 1fr;gap:8px 24px;font-size:12.5px}
.f-links a{color:var(--ink)}
.f-links a:hover{color:var(--main)}
.cp{max-width:1280px;margin:32px auto 0;padding-top:20px;border-top:1px solid var(--line);font-size:11px;color:var(--gray);text-align:center}

/* Scroll-to-top */
.to-top{position:fixed;right:24px;bottom:24px;width:48px;height:48px;border-radius:50%;background:var(--main);color:#fff;border:none;cursor:pointer;display:flex;align-items:center;justify-content:center;box-shadow:0 8px 20px -6px rgba(0,148,144,.4);opacity:0;visibility:hidden;transform:translateY(8px);transition:opacity .3s,visibility .3s,transform .3s,background .25s;z-index:200}
.to-top.visible{opacity:1;visibility:visible;transform:translateY(0)}
.to-top:hover{background:var(--main-deep);transform:translateY(-2px)}
.to-top svg{width:18px;height:18px;stroke:#fff;stroke-width:2.5;fill:none;stroke-linecap:round;stroke-linejoin:round}

.menu-toggle{display:none}
@media(max-width:840px){
  .nav-in{flex-wrap:wrap}
  .menu-toggle{display:flex;flex-direction:column;justify-content:center;gap:5px;width:32px;height:32px;background:none;border:none;cursor:pointer;padding:0;margin-left:auto}
  .menu-toggle span{display:block;width:24px;height:2px;background:var(--ink);transition:transform .3s,opacity .3s}
  .menu-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg)}
  .menu-toggle[aria-expanded="true"] span:nth-child(2){opacity:0}
  .menu-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
  .nav-r{display:none;width:100%;flex-direction:column;gap:0;align-items:stretch;padding:12px 0 4px;border-top:1px solid var(--line);margin-top:14px;margin-left:0}
  .nav-r.open{display:flex}
  .menu{display:flex;flex-direction:column;gap:0;width:100%}
  .menu a{padding:14px 0;border-bottom:1px solid var(--line)}
  .menu a::before{display:none}
  .cta-nav{margin-top:12px;text-align:center;padding:13px 20px;align-self:stretch}
  .f-in{grid-template-columns:1fr;gap:36px}
  .f-links{grid-template-columns:1fr}
}
.menu-top-mobile{display:none}
@media(max-width:840px){.menu-top-mobile{display:block;color:var(--main)!important;font-weight:800;background:var(--main-soft,#dff1f0);padding:14px 16px!important;margin:-12px -12px 4px;border-radius:4px}.menu-top-mobile::before{display:none!important}}