*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --ink:#1a1a1a;--muted:#444;--line:#e0e0e0;
  --accent:#1565c0;--accent-soft:#e3f2fd;--accent-dark:#0d47a1;
  --max:980px;
}
html{scroll-behavior:smooth;font-size:18px}
body{font-family:"Noto Sans SC",system-ui,sans-serif;background:#fff;color:var(--ink);line-height:1.85;font-size:1.05rem}
img{max-width:100%;height:auto;display:block}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}

.site-header{background:#fff;border-bottom:2px solid var(--line);position:sticky;top:0;z-index:200}
.header-inner{max-width:var(--max);margin:0 auto;padding:14px 20px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.brand{display:flex;align-items:center;gap:12px;color:var(--ink);font-weight:600;font-size:1.15rem}
.brand:hover{text-decoration:none}
.brand img{border-radius:10px}
.brand em{font-style:normal;color:var(--accent);font-weight:700}
.site-nav ul{display:flex;flex-wrap:wrap;gap:8px 20px;list-style:none}
.site-nav a{color:var(--muted);font-size:1rem;padding:6px 0}
.site-nav a.active{color:var(--accent);font-weight:700;border-bottom:3px solid var(--accent)}
.nav-toggle{display:none;background:none;border:none;cursor:pointer;padding:10px;flex-direction:column;gap:6px}
.nav-toggle span{display:block;width:26px;height:3px;background:var(--ink);transition:.2s;border-radius:2px}
.nav-toggle.is-open span:nth-child(1){transform:translateY(9px) rotate(45deg)}
.nav-toggle.is-open span:nth-child(2){opacity:0}
.nav-toggle.is-open span:nth-child(3){transform:translateY(-9px) rotate(-45deg)}

.ads-top-bar{background:#fafafa;border-bottom:1px solid var(--line);padding:12px 0}
.applist-title{font-size:.85rem;color:#666;text-align:center;margin-bottom:8px}
#ads{display:flex;justify-content:center;flex-wrap:wrap;gap:14px}
#ads .caption{font-size:.75rem;color:#666;margin-top:6px;text-align:center;max-width:80px;line-height:1.35}

.hero-bento{max-width:var(--max);margin:0 auto;padding:32px 20px 24px;text-align:center}
.hero-tag{display:inline-block;font-size:.95rem;font-weight:700;color:var(--accent);background:var(--accent-soft);border:2px solid #90caf9;padding:6px 18px;border-radius:999px;margin-bottom:16px}
.hero-bento h1{font-size:2rem;line-height:1.35;margin-bottom:18px;color:#111;max-width:860px;margin-left:auto;margin-right:auto}
.hero-bento .lead{text-align:left;font-size:1.12rem;color:var(--muted);max-width:860px;margin:0 auto;line-height:1.9}

.bento-tabs{max-width:var(--max);margin:0 auto 28px;padding:0 20px;display:flex;flex-wrap:wrap;gap:10px;justify-content:center}
.tab-btn{
  font-family:inherit;font-size:1.05rem;font-weight:600;
  padding:14px 22px;border:2px solid var(--line);border-radius:12px;
  background:#fff;color:var(--muted);cursor:pointer;transition:.2s;
}
.tab-btn:hover{border-color:#90caf9;color:var(--accent)}
.tab-btn.is-active{background:var(--accent);border-color:var(--accent);color:#fff;box-shadow:0 4px 14px rgba(21,101,192,.25)}

.bento-grid{max-width:var(--max);margin:0 auto;padding:0 20px 48px}
.bento-panel{display:none}
.bento-panel.is-visible{display:grid;grid-template-columns:1fr 280px;gap:18px;align-items:start}
.bento-card{background:#fff;border:2px solid var(--line);border-radius:16px;padding:24px 26px}
.bento-wide{grid-column:1}
.bento-panel .bento-card:last-child{grid-column:2;grid-row:1}
.bento-card h2{font-size:1.45rem;margin-bottom:14px;color:#111;line-height:1.4}
.bento-card h3{font-size:1.2rem;margin-bottom:12px;color:var(--accent-dark)}
.bento-card p{margin-bottom:14px;color:#333;font-size:1.05rem}
.bento-card figure{margin:20px 0;border-radius:12px;overflow:hidden;border:1px solid var(--line)}
.bento-card figcaption{font-size:.95rem;color:#666;padding:10px 14px;background:#fafafa;text-align:center}

.big-list{list-style:none;margin:0}
.big-list li{
  font-size:1.1rem;padding:12px 0;border-bottom:1px dashed var(--line);
  padding-left:28px;position:relative;color:#333;
}
.big-list li::before{content:"✓";position:absolute;left:0;color:var(--accent);font-weight:700}
.big-list li:last-child{border-bottom:none}

.accent-card{background:var(--accent-soft);border-color:#90caf9}

.faq-big dt{font-size:1.15rem;font-weight:700;margin:18px 0 8px;color:#111}
.faq-big dd{font-size:1.05rem;color:var(--muted);margin-bottom:12px;padding-left:0}

.read-more{display:flex;flex-wrap:wrap;gap:12px;margin-top:22px}
.read-more a{
  display:inline-block;padding:12px 20px;background:#fafafa;border:2px solid var(--line);
  border-radius:999px;font-size:1rem;color:#444;font-weight:500;
}
.read-more a:hover{background:var(--accent-soft);border-color:#90caf9;color:var(--accent);text-decoration:none}

.site-footer{background:#fafafa;border-top:2px solid var(--line);padding:32px 20px;text-align:center;font-size:1rem;color:#666}
.footer-links{display:flex;flex-wrap:wrap;justify-content:center;gap:10px 20px;margin-bottom:12px}
.footer-links a{color:#555;font-size:1rem}

.prose-page{max-width:780px;margin:0 auto;padding:36px 20px 56px}
.prose-page h1{font-size:1.75rem;margin-bottom:18px}
.prose-page h2{font-size:1.25rem;margin:24px 0 12px}
.prose-page p{margin-bottom:14px;color:#333;font-size:1.05rem}
.error-page{text-align:center;padding:64px 20px}
.error-page h1{font-size:3.5rem;color:var(--accent)}

@media(max-width:820px){
  .bento-panel.is-visible{grid-template-columns:1fr}
  .bento-panel .bento-card:last-child{grid-column:1}
  html{font-size:17px}
  .hero-bento h1{font-size:1.65rem}
  .nav-toggle{display:flex}
  .site-nav{position:absolute;top:100%;left:0;right:0;background:#fff;border-bottom:2px solid var(--line);padding:14px 20px;display:none;box-shadow:0 6px 16px rgba(0,0,0,.08)}
  .site-nav.is-open{display:block}
  .site-nav ul{flex-direction:column;gap:0}
  .site-nav li{border-bottom:1px solid #f0f0f0}
  .site-nav a{display:block;padding:14px 0;font-size:1.1rem}
  .header-inner{position:relative;flex-wrap:wrap}
  .tab-btn{flex:1 1 calc(50% - 10px);padding:12px 10px;font-size:.98rem}
}