:root {
  --bg: linear-gradient(180deg, #f5f5f7 0%, #eaeaf0 100%);
  --card: #fff;
  --accent: #4263eb;
  --radius: 20px;
  --shadow: 0 6px 18px rgba(0,0,0,0.05);
  --muted: #555;
  font-family: "Noto Sans JP","Segoe UI",Roboto,sans-serif;
}
body { margin:0; background:var(--bg); color:#222; line-height:1.6; }
header{
  background:rgba(255,255,255,0.9);
  backdrop-filter:blur(6px);
  border-bottom:1px solid #e0e0e5;
  position:sticky;top:0;z-index:40;
}
.topbar{
  max-width:1200px;margin:0 auto;
  display:flex;justify-content:space-between;align-items:center;
  padding:12px 18px;
}
.brand img.logo { height:38px; display:block; }
nav ul{ list-style:none;margin:0;padding:0; display:flex;gap:16px; }
nav a{ color:#333;text-decoration:none; font-size:15px; padding:6px 10px; border-radius:8px; }
nav a:hover{ color:var(--accent); background:#f0f3ff; }
.menu-toggle{ display:none; }

main.container { max-width:1200px;margin:40px auto;padding:0 10px; }

.hero-info h1 { font-size:24px;margin-bottom:8px; }
.hero-info p { color:var(--muted); font-size:15px;margin-bottom:20px; }

.grid{
  display:grid;
  grid-template-columns: repeat(3, 1fr);
  gap:18px;
  max-width: calc(400px * 3 + 42px);
  margin: 0 auto;
  width: 100%;
}

.card{
  background:var(--card);
  border-radius:var(--radius);
  overflow:hidden;
  box-shadow:var(--shadow);
  text-align:center;
  padding-bottom:18px;
}

.thumb img{
  width:100%;height:170px;object-fit:cover;display:block;
  border-bottom:1px solid #e5e5e5;
}
.card h3{margin:10px 0;font-size:15px;}
.download-btn {
  display:inline-block;
  margin-top:6px;
  padding:10px 18px;
  background:var(--accent);
  color:#fff;
  border-radius:10px;
  font-size:14px;
  text-decoration:none;
  transition: transform 0.2s, box-shadow 0.2s;
}
.download-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 15px rgba(0,0,0,0.2);
  opacity: 1;
}

footer {
  text-align:center; padding:30px 10px;
  border-top:1px solid #e5e5ec; background:rgba(255,255,255,0.8);
  font-size:13px; color:#666;
}
footer a { color:var(--accent); margin:0 8px; text-decoration:none; }
footer a:hover { text-decoration:underline; }

.hero-bg{
  width:100%;
  height:240px;
  background:url("../../%E6%B9%96/lake01.jpg")  bottom center / cover no-repeat;
  background-position: 30% 60%;
  border-radius:0 0 18px 18px;
  margin-bottom:24px;
}

.hero-card{
  background: url("../../%E6%B9%96/lake01.jpg")  bottom center / cover no-repeat;
  background-position: 30% 60%;
  padding: 40px 26px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  margin-bottom: 26px;
  color: #fff;
  text-shadow: 0 2px 6px rgba(0,0,0,0.35);
}

/* トップボタン */
#backToTop{
  position:fixed;
  bottom:20px;right:20px;
  background:var(--accent);color:#fff;
  border:none;border-radius:50%;
  width:46px;height:46px;
  cursor:pointer;font-size:20px;
  display:none;
  align-items:center;justify-content:center;
  box-shadow:0 4px 12px rgba(0,0,0,0.2);
  z-index:50;
}
#backToTop:hover{background:#2f54d6;}

@media (max-width: 980px) {
  .menu-toggle { display:block; position:absolute; top:11px; right:10px; font-size:28px; background:none; border:none; color:rgb(123, 123, 123); cursor:pointer;}

  nav ul {
    display:none; flex-direction:column;
    position:absolute; top:55px; right:10px;
    background: rgba(255,255,255,0.95);
    border-radius: 8px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.2);
    padding:12px; width:180px;
  }

  nav ul.show { display:flex; }
   nav ul li a {
    padding: 10px;
    color: #333;
  }

  .hero-info p { color: var(--muted); font-size: 13px; margin-bottom: 20px; }
}


@media (prefers-color-scheme: dark) {
  :root { --bg: #18181b; --card: #1f1f23; --muted: #aaa; --accent: #5b8bff; }
  body { color: #f5f5f7; }
  header, footer { background: #1f1f23; border-color: #333; }
  nav a { color: #eee; }
}

@media (max-width: 600px) {
  footer {
    white-space: nowrap;
    overflow-x: auto;   
  }

  footer a {
    display: inline;
    margin: 0 6px;
  }
  .grid {   grid-template-columns: minmax(0, 1fr);
    max-width: 370px;      
    margin: 0 auto;        
  }
}
.visually-hidden{
  position:absolute;
  width:1px;
  height:1px;
  overflow:hidden;
  clip: rect(0 0 0 0);
}

/* ===== Added features only: original design is preserved ===== */
html{scroll-behavior:smooth}.theme-toggle{border:1px solid rgba(120,130,160,.25);background:rgba(255,255,255,.72);color:inherit;border-radius:999px;padding:6px 10px;cursor:pointer}.theme-toggle:hover{opacity:.9}.lang-links{display:inline-flex;gap:6px;flex-wrap:wrap;align-items:center;margin-left:8px}.lang-links a{font-size:13px;padding:5px 8px;border-radius:999px;border:1px solid rgba(120,130,160,.22);text-decoration:none;color:var(--accent,#4263eb);background:rgba(255,255,255,.55)}
body.dark-mode{--bg:#18181b;--card:#1f1f23;--muted:#aaa;--accent:#5b8bff;color:#f5f5f7;background:#18181b}body.dark-mode header,body.dark-mode footer{background:#1f1f23!important;border-color:#333!important}body.dark-mode nav a{color:#eee}body.dark-mode .card,body.dark-mode .card-box,body.dark-mode .hero,body.dark-mode .contact-box,body.dark-mode #seo-intro{background:#1f1f23;color:#f5f5f7}body.dark-mode .download-btn{background:var(--accent,#5b8bff)}body.dark-mode .hero-info p,body.dark-mode .card-box p,body.dark-mode .card-box ul{color:#aaa}
.toc-toggle{position:fixed;left:14px;top:50%;transform:translateY(-50%);z-index:90;border:none;background:var(--accent,#4263eb);color:#fff;border-radius:999px;padding:12px 14px;box-shadow:0 10px 24px rgba(0,0,0,.22);cursor:pointer;font-weight:700;writing-mode:vertical-rl;letter-spacing:.08em}.toc-drawer{position:fixed;left:0;top:0;bottom:0;width:min(330px,86vw);background:rgba(255,255,255,.98);box-shadow:12px 0 34px rgba(0,0,0,.18);z-index:100;transform:translateX(-105%);transition:.25s ease;overflow:auto;padding:22px 18px;backdrop-filter:blur(10px)}.toc-drawer.show{transform:translateX(0)}.toc-head{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-bottom:12px}.toc-close{border:none;background:transparent;font-size:26px;cursor:pointer;color:inherit}.toc-grid{display:grid;grid-template-columns:1fr;gap:8px}.toc-drawer a{display:block;text-decoration:none;color:#333;padding:9px 10px;border-radius:12px;border:1px solid #e3e8f7;background:rgba(255,255,255,.5);font-size:14px}.toc-drawer a:hover{color:var(--accent,#4263eb);background:#f0f3ff}body.dark-mode .toc-drawer{background:rgba(31,35,49,.98)}body.dark-mode .toc-drawer a{background:rgba(255,255,255,.05);border-color:#31384c;color:#eef3ff}
.site-index-panel,.ranking-panel{max-width:1200px;margin:30px auto 0;padding:22px;border-radius:var(--radius,20px);box-shadow:var(--shadow,0 6px 18px rgba(0,0,0,0.05));background:var(--card,#fff);border:1px solid #e3e8f7}.site-index-panel h2,.ranking-panel h2{font-size:20px;margin:0 0 14px;color:inherit}.site-link-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:10px}.site-link-grid a,.rank-item{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:10px 12px;border-radius:14px;border:1px solid #e3e8f7;background:linear-gradient(135deg,rgba(255,255,255,.72),rgba(245,248,255,.62));text-decoration:none;color:inherit;font-size:14px}.site-link-grid a:hover{color:var(--accent,#4263eb);transform:translateY(-1px)}.ranking-list{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:10px}.rank-no{font-weight:800;color:#ffb703}.rank-count{font-size:12px;color:var(--muted,#555)}body.dark-mode .site-index-panel,body.dark-mode .ranking-panel{background:#1f1f23;border-color:#31384c}body.dark-mode .site-link-grid a,body.dark-mode .rank-item{background:rgba(255,255,255,.05);border-color:#31384c}
.breadcrumb{max-width:1200px;margin:18px auto -16px;padding:0 10px;font-size:13px;color:var(--muted,#555)}.breadcrumb a{color:var(--accent,#4263eb);text-decoration:none}.seo-text{max-width:1200px;margin:26px auto;padding:18px 20px;border-radius:var(--radius,20px);background:var(--card,#fff);box-shadow:var(--shadow,0 6px 18px rgba(0,0,0,0.05));color:var(--muted,#555);font-size:14px}.seo-text h2{font-size:18px;color:inherit;margin:0 0 8px}.seo-text p{margin:0 0 8px}.seo-text ul{margin:8px 0 0 20px}.seo-text li{margin:3px 0}body.dark-mode .seo-text{background:#1f1f23;color:#aaa}
@media(max-width:980px){.toc-toggle{left:8px;padding:10px 11px;font-size:13px}.site-index-panel,.ranking-panel{margin-left:10px;margin-right:10px}.site-link-grid{grid-template-columns:repeat(4,minmax(0,1fr))}.theme-toggle{padding:6px 9px}.lang-links{margin:8px 0 0 0}}@media(max-width:600px){.page-title{font-size:20px;}.site-link-grid{grid-template-columns:repeat(4,minmax(0,1fr))}.ranking-list{grid-template-columns:1fr}.toc-toggle{bottom:74px;top:auto;transform:none;writing-mode:horizontal-tb;left:12px}.toc-drawer{width:min(310px,88vw)}}


/* requested header/category fixes */
.lang-links{display:none!important;}
header nav,.topbar>nav{margin-left:auto;}
.toc-toggle{font-weight:700;}
@media(max-width:600px){
  body:has(#card-grid) #card-grid.grid,
  #card-grid.grid{
    grid-template-columns:repeat(4,minmax(0,1fr))!important;
    gap:8px!important;
  }
  #card-grid .thumb{height:72px!important;}
  #card-grid .card h3{font-size:11px!important;line-height:1.25!important;margin:7px 4px 5px!important;}
  #card-grid .card{border-radius:12px!important;}
}

/* performance and requested multilingual fixes */
.card{content-visibility:auto;contain-intrinsic-size:220px 220px;}
.thumb img{background:#eef1ff;}
@media(max-width:600px){#card-grid.grid{grid-template-columns:repeat(4,minmax(0,1fr))!important;gap:8px!important;}#card-grid .thumb{height:72px!important;}#card-grid .card h3{font-size:11px!important;line-height:1.25!important;margin:7px 4px 5px!important;}.site-link-grid{grid-template-columns:repeat(2,minmax(0,1fr))!important;}}

body.dark-mode nav ul,
html[data-theme="dark"] nav ul,
[data-theme="dark"] nav ul {
  background: #1f1f23 !important;
}
header nav a:hover,
.topbar nav a:hover {
  color: #5b8bff !important;
}