/* 屈斜路湖オープンウォータースイミング */
:root{
  --navy:#0b3a5b;
  --blue:#1673a8;
  --sky:#e8f3fa;
  --line:#d5e3ec;
  --text:#22313b;
  --muted:#5d6f7b;
  --accent:#e2573b;
  --bg:#ffffff;
  --radius:6px;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);
  font-family:"Hiragino Kaku Gothic ProN","Hiragino Sans","Noto Sans JP",Meiryo,sans-serif;
  font-size:16px;line-height:1.85;-webkit-text-size-adjust:100%}
img{max-width:100%;height:auto;vertical-align:middle}
a{color:var(--blue)}
a:hover{color:var(--navy)}
.inner,.container{max-width:1080px;margin:0 auto;padding:0 16px}
.container.narrow{max-width:860px}

/* header */
.site-header{background:#fff;border-bottom:3px solid var(--navy);position:sticky;top:0;z-index:50}
.site-header .inner{display:flex;align-items:center;justify-content:space-between;padding-top:10px;padding-bottom:10px}
.logo img{display:block;width:auto;max-height:64px}
.menu-toggle{display:none;background:none;border:0;cursor:pointer;padding:6px;color:var(--navy)}
.menu-toggle span{display:block;width:26px;height:2px;background:currentColor;margin:5px auto;transition:.2s}
.menu-toggle b{display:block;font-size:10px;letter-spacing:.08em}
.gnav ul{list-style:none;margin:0 auto;padding:0 16px;max-width:1080px;display:flex;justify-content:space-between}
.gnav a{display:block;padding:12px 10px;color:var(--navy);text-decoration:none;font-weight:700;font-size:15px;border-bottom:3px solid transparent;margin-bottom:-3px}
.gnav a:hover,.gnav a[aria-current="page"]{color:var(--blue);border-bottom-color:var(--blue)}

/* ticker */
.ticker{background:var(--sky);font-size:14px}
.ticker .inner{display:flex;gap:12px;align-items:center;padding-top:8px;padding-bottom:8px}
.ticker-label{background:var(--navy);color:#fff;font-size:11px;font-weight:700;letter-spacing:.08em;padding:2px 8px;border-radius:3px;white-space:nowrap}
.ticker a{color:var(--text);text-decoration:none;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.ticker a:hover{text-decoration:underline}

.breadcrumb{max-width:1080px;margin:0 auto;padding:10px 16px 0;font-size:13px;color:var(--muted)}
.breadcrumb a{color:var(--muted)}
.breadcrumb span{margin:0 8px}

/* main */
.main{padding-bottom:56px}
.hero{background:var(--sky)}
.hero img{display:block;margin:0 auto;width:auto;height:auto;max-width:100%;max-height:min(70vh,600px)}
.page-title{font-size:28px;color:var(--navy);text-align:center;margin:28px 0 24px;line-height:1.4}
.page-title.left{text-align:left;margin-top:4px}
.block{margin:32px 0}
.block h2{font-size:20px;color:var(--navy);margin:0 0 16px;padding:8px 14px;background:var(--sky);border-left:5px solid var(--blue);line-height:1.5}
.block h2.center{background:none;border:0;text-align:center;font-size:26px;padding:0;margin-top:40px}
.block h2.center::after{content:"";display:block;width:48px;height:3px;background:var(--blue);margin:10px auto 0}
.block h3,.post-body h3{font-size:17px;color:var(--navy);margin:22px 0 8px;padding-bottom:4px;border-bottom:1px solid var(--line)}
h2 small,h3 small{font-size:.8em;font-weight:400;color:var(--muted)}
.center{text-align:center}
.big{font-size:22px;font-weight:700;color:var(--navy)}
.note{color:var(--muted);font-size:14px}
.alert{color:var(--accent)}

.lead-box{text-align:center;background:linear-gradient(135deg,var(--navy),var(--blue));color:#fff;border-radius:var(--radius);padding:22px 16px}
.lead-box p{margin:0}
.lead-sub{font-size:15px;opacity:.9}
.lead-date{font-size:22px;font-weight:700}

/* lists */
ol.circled{list-style:none;counter-reset:c;padding-left:0;margin:8px 0}
ol.circled>li{counter-increment:c;position:relative;padding-left:2em;margin:6px 0}
ol.circled>li::before{content:counter(c);position:absolute;left:0;top:.35em;width:1.45em;height:1.45em;border:1px solid var(--blue);border-radius:50%;color:var(--blue);font-size:.8em;line-height:1.35em;text-align:center}
ol.circled[start="6"]{counter-reset:c 5}
ul.kana{list-style:none;padding-left:.5em;margin:4px 0}
ul.route{padding-left:1.2em}
.limits{list-style:none;padding:0;display:grid;grid-template-columns:repeat(4,1fr);gap:12px}
.limits li{border:1px solid var(--line);border-radius:var(--radius);text-align:center;padding:14px 8px;background:#fff}
.limits b{display:block;font-size:20px;color:var(--navy)}
.limits span{color:var(--muted);font-size:14px}

/* tables */
.table-wrap{overflow-x:auto}
table{border-collapse:collapse;width:100%}
table.spec th,table.spec td{border-bottom:1px solid var(--line);padding:10px 12px;text-align:left;vertical-align:top}
table.spec th{width:7em;color:var(--navy);white-space:nowrap}
table.spec.time th{width:9em}
table.grid{min-width:520px}
table.grid th,table.grid td{border:1px solid var(--line);padding:8px 10px;text-align:center}
table.grid thead th{background:var(--navy);color:#fff}
table.grid td[rowspan]{background:var(--sky);font-weight:700}

/* news */
.news-list{list-style:none;margin:0;padding:0;border-top:1px solid var(--line)}
.news-list li{border-bottom:1px solid var(--line)}
.news-list a{display:flex;gap:20px;padding:14px 4px;text-decoration:none;color:var(--text)}
.news-list a:hover .t{color:var(--blue);text-decoration:underline}
.news-list time{color:var(--muted);white-space:nowrap;min-width:9.5em}
.news-list .excerpt{margin:-8px 4px 14px;color:var(--muted);font-size:14px}

.post-date{color:var(--muted);margin:28px 0 0;font-size:14px}
.post-body img{display:block;margin:12px 0;border-radius:var(--radius)}
.post-body img.portrait{max-width:420px}
.post-body hr{border:0;border-top:1px solid var(--line);margin:20px 0}
.note-box{background:var(--sky);padding:12px 16px;border-radius:var(--radius);font-weight:700}
.post-nav{display:flex;justify-content:space-between;gap:16px;margin:40px 0 24px;font-size:14px}
.post-nav a{text-decoration:none;max-width:48%}
.post-nav .next{text-align:right;margin-left:auto}

/* buttons */
.btn{display:inline-block;background:var(--blue);color:#fff !important;text-decoration:none;padding:10px 28px;border-radius:999px;font-weight:700;border:2px solid var(--blue);cursor:pointer;font-size:15px;line-height:1.6;font-family:inherit}
.btn:hover{background:var(--navy);border-color:var(--navy)}
.btn.ghost{background:#fff;color:var(--blue) !important}
.btn.ghost:hover{background:var(--sky)}
img.banner{max-width:320px;width:100%}

.map{position:relative;padding-top:66%;border-radius:var(--radius);overflow:hidden}
.map iframe{position:absolute;inset:0;width:100%;height:100%;border:0}

/* form */
.contact-form label{display:block;font-weight:700;margin:16px 0 0;color:var(--navy)}
.contact-form input[type=text],.contact-form input[type=email],.contact-form input[type=tel],.contact-form input[type=date],.contact-form textarea{
  display:block;width:100%;margin-top:6px;padding:10px 12px;font-size:16px;border:1px solid #b9cbd7;border-radius:4px;font-family:inherit;background:#fff;color:var(--text)}
.contact-form input:focus,.contact-form textarea:focus{outline:2px solid var(--blue);outline-offset:1px}
.contact-form .agree{font-weight:400;margin:12px 0 20px}
.req{color:var(--accent);margin-left:2px}
.privacy{background:var(--sky);border-radius:var(--radius);padding:4px 16px;margin-top:24px;font-size:14px}
.hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}
.msg{padding:16px;border-radius:var(--radius);background:var(--sky)}
.msg.error{background:#fdecea;color:#8a1f11}
dl.confirm dt{font-weight:700;color:var(--navy);margin-top:12px}
dl.confirm dd{margin:4px 0 0;white-space:pre-wrap;border-bottom:1px solid var(--line);padding-bottom:8px}

/* footer */
.site-footer{background:var(--navy);color:#dbe8f1;padding:32px 0 24px;font-size:14px;text-align:center}
.site-footer a{color:#fff}
.sponsor img{background:#fff;padding:8px;border-radius:4px}
.sns{margin:14px 0}
.fnav{list-style:none;padding:0;margin:18px 0;display:flex;flex-wrap:wrap;justify-content:center;gap:4px 18px}
.fnav a{text-decoration:none}
.fnav a:hover{text-decoration:underline}
.copy{margin:16px 0 0;opacity:.8;font-size:12px}
.to-top{position:fixed;right:16px;bottom:16px;width:44px;height:44px;border-radius:50%;background:var(--blue);color:#fff;text-decoration:none;display:flex;align-items:center;justify-content:center;font-size:14px;opacity:0;pointer-events:none;transition:opacity .2s;box-shadow:0 2px 8px rgba(0,0,0,.2)}
.to-top.show{opacity:.9;pointer-events:auto}

/* responsive */
@media (max-width:900px){
  .menu-toggle{display:block}
  .gnav{display:none;border-top:1px solid var(--line)}
  .gnav.open{display:block}
  .gnav ul{flex-direction:column;padding:0}
  .gnav a{padding:12px 20px;border-bottom:1px solid var(--line);margin:0}
  .gnav a[aria-current="page"]{border-bottom-color:var(--line);background:var(--sky)}
  .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)}
}
@media (max-width:640px){
  body{font-size:15px}
  .logo img{max-height:44px}
  .page-title{font-size:22px}
  .block h2{font-size:17px}
  .lead-date{font-size:18px}
  .limits{grid-template-columns:repeat(2,1fr)}
  .news-list a{flex-direction:column;gap:0}
  table.spec th{width:auto;display:block;padding-bottom:0;border:0}
  table.spec td{display:block;padding-top:2px}
  table.spec tr{display:block;border-bottom:1px solid var(--line)}
  table.spec th,table.spec td{border-bottom:0}
  .post-nav{flex-direction:column}
  .post-nav a{max-width:100%}
}