: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 */
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; background: none; border: none;
  font-size: 26px; cursor: pointer; color: #333;
}

/* Main */
main.container { max-width: 800px; margin: 50px auto; padding: 0 20px; }
.hero-info h1 { font-size: 26px; margin-bottom: 8px; }
.hero-info p { color: var(--muted); font-size: 15px; margin-bottom: 20px; }
.contact-box {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 32px;
}
.contact-box form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.contact-box label {
  font-weight: 600;
  color: #5a5a5a;
}
.contact-box textarea {
  width: 96%;
  padding: 12px 14px;
  border: 1px solid #ccc;
  border-radius: 10px;
  font-size: 15px;
  resize: vertical;
  font-family: inherit;
  transition: 0.3s;
  
}
.contact-box textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(66,99,235,0.15);
}
.contact-box button {
  align-self: flex-start;
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 10px 22px;
  border-radius: 10px;
  font-size: 15px;
  cursor: pointer;
  transition: 0.25s;
}
.contact-box button:hover {
  transform: translateY(-2px);
  background: #2e4fde;
  box-shadow: 0 4px 10px rgba(66,99,235,0.3);
}
#form-result {
  font-weight: 600;
  margin-top: 15px;
  opacity: 0;
  transition: opacity 0.4s ease;
}
#form-result.show { opacity: 1; }
#form-result.success { color: var(--accent); }
#form-result.error { color: #e63946; }

/* Footer */
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; }
.menu-toggle {
  display: none;
  font-size: 24px;
  background: none;
  border: none;
  color: #333;
  cursor: pointer;
  position: absolute;
  top: -23px;
  right: -10px;
  
  
}


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

  nav ul {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 60px;
    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;
    backdrop-filter: blur(8px);
  }

  nav ul.show {
    display: flex;
  }


  nav ul li a {
    padding: 10px;
    color: #333;
  }

  nav ul li a:hover {
    background: #f0f3ff;
    color: var(--accent);
  }
  }

@media (max-width: 980px) {
  .menu-toggle { display: block; }
  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; }
  .hero-info p { color: var(--muted); font-size: 13px; margin-bottom: 20px; }

  .contact-box textarea {
  width: 87%;
  padding: 5px 19px;
  border: 1px solid #ccc;
  border-radius: 10px;
  font-size: 15px;
  resize: vertical;
  font-family: inherit;
  transition: 0.3s;
  
}

}

@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; }
}

.contact-box textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 4px rgba(66,99,235,0.2);
}

.contact-box button:hover {
  transform: translateY(-2px) scale(1.02);
  background: #2e4fde;
  box-shadow: 0 6px 16px rgba(66,99,235,0.3);
}
@media (max-width: 600px) {
  footer {
    white-space: nowrap;
    overflow-x: auto;   
  }

  footer a {
    display: inline;
    margin: 0 6px;
  }
}
  
/* ===== 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;
}