*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
body{font-family:"Noto Sans SC",system-ui,sans-serif;background:#fff;color:#1a1a1a;line-height:1.78;font-size:16px}
a{color:#0d9488;text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;height:auto;display:block}
.container{max-width:1040px;margin:0 auto;padding:0 20px}

.site-header{background:#fff;border-bottom:1px solid #ececec;position:sticky;top:0;z-index:200}
.header-row{display:flex;align-items:center;justify-content:space-between;padding:14px 0;position:relative}
.brand{display:flex;align-items:center;gap:10px;font-size:1.05rem;color:#1a1a1a;font-weight:500}
.brand:hover{text-decoration:none}
.brand b{color:#0d9488;font-weight:700}
.site-nav ul{display:flex;gap:6px 18px;list-style:none;flex-wrap:wrap}
.site-nav a{color:#444;font-size:.92rem;padding:4px 0}
.site-nav a.active{color:#0d9488;font-weight:600;border-bottom:2px solid #0d9488}
.nav-toggle{display:none;background:none;border:none;cursor:pointer;padding:8px;flex-direction:column;gap:5px}
.nav-toggle span{display:block;width:22px;height:2px;background:#333;transition:.2s}
.nav-toggle.is-open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle.is-open span:nth-child(2){opacity:0}
.nav-toggle.is-open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

.ads-top-bar{background:#fafafa;border-bottom:1px solid #eee;padding:10px 0}
.applist-title{font-size:.78rem;color:#888;text-align:center;margin-bottom:6px;letter-spacing:.05em}
#ads{display:flex;justify-content:center;flex-wrap:wrap;gap:12px}
#ads .caption{font-size:.7rem;color:#666;margin-top:4px;text-align:center;max-width:70px;line-height:1.3}

.hero-bento{padding:36px 0 20px;text-align:center;border-bottom:1px solid #f3f3f3}
.hero-bento h1{font-size:1.66rem;line-height:1.42;margin-bottom:16px;color:#111;max-width:760px;margin-left:auto;margin-right:auto}
.hero-bento .lead{color:#444;margin-bottom:12px;font-size:1.02rem;max-width:720px;margin-left:auto;margin-right:auto;text-align:left}
.hero-bento .lead:last-of-type{margin-bottom:0}

.chapter-rail{position:sticky;top:58px;z-index:150;background:rgba(255,255,255,.96);backdrop-filter:blur(6px);border-bottom:1px solid #eee;padding:10px 0}
.chapter-rail .container{display:flex;flex-wrap:wrap;gap:8px;justify-content:center}
.chapter-pill{display:inline-flex;align-items:center;gap:6px;padding:6px 14px;border-radius:999px;font-size:.82rem;color:#555;background:#f4fafa;border:1px solid #d1fae5;transition:.15s}
.chapter-pill:hover{background:#ecfdf5;color:#0d9488;text-decoration:none}
.chapter-pill.is-active{background:#0d9488;color:#fff;border-color:#0d9488;font-weight:600}
.chapter-pill .num{font-size:.72rem;font-weight:700;opacity:.85}

.bento-grid{display:grid;grid-template-columns:repeat(3,1fr);grid-auto-rows:minmax(120px,auto);gap:16px;padding:28px 0 48px}
.bento-cell{background:#fff;border:1px solid #e8e8e8;border-radius:12px;padding:22px 20px;position:relative;overflow:hidden;transition:box-shadow .2s}
.bento-cell:hover{box-shadow:0 4px 18px rgba(13,148,136,.08)}
.bento-cell.span-2{grid-column:span 2}
.bento-cell.span-row-2{grid-row:span 2}
.bento-cell.featured{background:linear-gradient(135deg,#f0fdfa 0%,#fff 60%);border-color:#99f6e4}
.cell-tag{display:inline-block;font-size:.72rem;font-weight:700;color:#0d9488;background:#ecfdf5;padding:3px 10px;border-radius:4px;margin-bottom:10px;letter-spacing:.04em}
.bento-cell h2{font-size:1.12rem;margin-bottom:10px;color:#222;line-height:1.4}
.bento-cell p{margin-bottom:10px;color:#333;font-size:.96rem}
.bento-cell p:last-child{margin-bottom:0}
.bento-cell figure{margin:14px 0 0}
.bento-cell figcaption{font-size:.84rem;color:#777;margin-top:6px}
.highlight-box{background:#ecfdf5;border-left:3px solid #0d9488;padding:12px 16px;margin:12px 0;font-size:.93rem;color:#444;border-radius:0 6px 6px 0}
.stat-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:14px}
.stat-chip{flex:1;min-width:100px;background:#f9fafb;border:1px solid #eee;border-radius:8px;padding:12px;text-align:center}
.stat-chip strong{display:block;font-size:1.1rem;color:#0d9488;margin-bottom:4px}

.site-footer{background:#fafafa;border-top:1px solid #eee;padding:28px 0;margin-top:8px;text-align:center;font-size:.88rem;color:#666}
.footer-links{display:flex;flex-wrap:wrap;justify-content:center;gap:8px 16px;margin-bottom:10px}
.footer-links a{color:#555}

.prose-page{padding:32px 0 48px}
.prose-page h1{font-size:1.5rem;margin-bottom:16px}
.prose-page h2{font-size:1.15rem;margin:24px 0 10px;color:#222}
.prose-page p{margin-bottom:12px;color:#333}
.error-page{text-align:center;padding:48px 0 24px}
.error-page h1{font-size:3rem;color:#0d9488}

@media(max-width:768px){
  .nav-toggle{display:flex}
  .site-nav{position:absolute;top:100%;left:0;right:0;background:#fff;border-bottom:1px solid #eee;padding:12px 20px;display:none;box-shadow:0 4px 12px rgba(0,0,0,.06)}
  .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:12px 0}
  .hero-bento h1{font-size:1.28rem}
  .bento-grid{grid-template-columns:1fr}
  .bento-cell.span-2,.bento-cell.span-row-2{grid-column:span 1;grid-row:span 1}
  .chapter-rail{top:52px}
  .chapter-pill{font-size:.78rem;padding:5px 10px}
}