*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
:root{
  --teal:#0d9488;--teal-dark:#0f766e;--teal-soft:#ecfdf5;
  --amber:#d97706;--amber-soft:#fffbeb;--ink:#134e4a;
  --text:#1c1917;--muted:#78716c;--line:#99f6e4;--white:#fff;
  --pat-a:repeating-linear-gradient(90deg,transparent,transparent 10px,rgba(13,148,136,.05) 10px,rgba(13,148,136,.05) 20px);
  --pat-b:repeating-linear-gradient(0deg,transparent,transparent 10px,rgba(217,119,6,.04) 10px,rgba(217,119,6,.04) 20px)
}
body{font-family:"Noto Sans SC",system-ui,sans-serif;background:#fff;color:var(--text);line-height:1.78;font-size:16px}
a{color:var(--teal-dark);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;height:auto;display:block}

.site-header{background:#fff;border-bottom:3px solid var(--teal);position:sticky;top:0;z-index:300}
.header-inner{max-width:1140px;margin:0 auto;padding:12px 20px;display:flex;align-items:center;justify-content:space-between;gap:16px;position:relative}
.brand{display:flex;align-items:center;gap:10px;color:#111;font-weight:600;font-size:.93rem}
.brand:hover{text-decoration:none}
.brand img{border-radius:8px;border:2px solid var(--line)}
.brand em{font-style:normal;color:var(--teal-dark);font-weight:700}
.site-nav ul{display:flex;flex-wrap:wrap;gap:6px 18px;list-style:none}
.site-nav a{color:var(--muted);font-size:.9rem;padding:4px 0}
.site-nav a.active,.site-nav a:hover{color:var(--amber);font-weight:600;border-bottom:2px solid var(--teal);text-decoration:none}
.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:var(--teal-soft);border-bottom:1px solid var(--line);padding:10px 0}
.applist-title{font-size:.78rem;color:var(--teal-dark);text-align:center;margin-bottom:6px}
#ads{display:flex;justify-content:center;flex-wrap:wrap;gap:12px}

.page-shell{max-width:1140px;margin:0 auto;padding:24px 20px 52px}

.chapter-nav{display:flex;flex-wrap:wrap;gap:8px 10px;padding:0 0 22px;margin-bottom:26px;border-bottom:2px dotted var(--teal)}
.chapter-nav a{font-size:.81rem;padding:6px 15px;border-radius:6px;border:1.5px solid var(--line);color:var(--ink);background:var(--white);transition:all .15s}
.chapter-nav a:hover{background:var(--teal);color:#fff;border-color:var(--teal-dark);text-decoration:none;font-weight:600}

.checker-grid{
  display:grid;
  grid-template-columns:repeat(2,1fr);
  gap:2px;
  background:var(--ink);
  border:3px solid var(--ink);
  border-radius:12px 32px 12px 32px;
  overflow:hidden;
  box-shadow:6px 6px 0 rgba(13,148,136,.2)
}
.checker-cell{
  padding:24px 22px;
  min-height:180px;
  background:var(--white);
  position:relative
}
.checker-cell:nth-child(6n+1){background-image:var(--pat-a)}
.checker-cell:nth-child(6n+2){background-image:var(--pat-b)}
.checker-cell:nth-child(6n+3){background-image:var(--pat-b)}
.checker-cell:nth-child(6n+4){background-image:var(--pat-a)}
.checker-cell:nth-child(6n+5){background-image:var(--pat-a)}
.checker-cell:nth-child(6n){background-image:var(--pat-b)}
.checker-cell--lead{
  grid-column:1/-1;
  background:linear-gradient(120deg,var(--ink) 0%,var(--teal) 50%,var(--amber) 100%);
  background-image:none;
  color:#fff;
  padding:34px 30px;
  border-bottom:2px solid rgba(255,255,255,.15)
}
.checker-cell--lead::before{
  content:"";
  position:absolute;inset:0;
  background:var(--pat-b);
  opacity:.06;
  pointer-events:none
}
.checker-cell--lead>*{position:relative;z-index:1}
.checker-cell--lead h1{font-size:clamp(1.28rem,3.4vw,1.88rem);line-height:1.35;margin-bottom:14px;color:#fff}
.checker-cell--lead .hero-badge{
  display:inline-block;font-size:.74rem;font-weight:700;
  color:var(--ink);background:#fff;
  padding:4px 16px;border-radius:6px;margin-bottom:14px;
  box-shadow:2px 2px 0 rgba(0,0,0,.06)
}
.checker-cell--lead p{color:#ecfdf5;font-size:.98rem;margin-bottom:10px;text-align:justify}
.checker-cell--lead p:last-child{margin-bottom:0}
.chip-row{display:flex;flex-wrap:wrap;gap:8px;margin-top:16px}
.chip-row span{font-size:.75rem;padding:4px 12px;border-radius:6px;background:rgba(255,255,255,.14);color:#fff;border:1px solid rgba(255,255,255,.25)}

.checker-cell--wide{grid-column:1/-1;background:var(--amber-soft)}
.checker-cell h2{font-size:1.05rem;color:var(--ink);margin-bottom:10px;line-height:1.38;padding-left:11px;border-left:4px solid var(--amber)}
.checker-cell p{margin-bottom:10px;text-align:justify;color:#44403c;font-size:.94rem}
.checker-cell p:last-child{margin-bottom:0}
.checker-cell figure{margin:14px 0 0;border-radius:10px;overflow:hidden;border:2px solid var(--line);background:#fff;box-shadow:3px 3px 0 var(--teal-soft)}
.checker-cell figcaption{font-size:.78rem;color:var(--muted);padding:8px 13px;background:var(--teal-soft)}

.tip-box{
  background:#fff;
  border:2px dashed var(--amber);
  border-radius:10px;
  padding:12px 16px;
  margin:12px 0 0;
  font-size:.9rem;
  color:var(--amber)
}

.faq-panel{margin-top:38px;padding-top:26px;border-top:3px dotted var(--teal)}
.faq-panel>h2{font-size:1.12rem;margin-bottom:16px;color:var(--ink)}
.faq-item{border:2px solid var(--line);margin-bottom:10px;background:#fff;border-radius:10px;overflow:hidden}
.faq-item h3{padding:13px 17px;font-size:.95rem;font-weight:600;color:var(--ink);background:var(--teal-soft);border-bottom:1px solid var(--line)}
.faq-item p{padding:13px 17px;color:#57534e;font-size:.92rem}

.read-more{max-width:1140px;margin:0 auto;padding:0 20px 36px}
.read-more h2{font-size:1.01rem;margin-bottom:12px;color:var(--ink)}
.read-more ul{list-style:none;display:flex;flex-wrap:wrap;gap:10px 18px}
.read-more a{font-size:.9rem}

.extra-pad{max-width:1140px;margin:0 auto;padding:0 20px 40px}
.extra-pad h2{font-size:1.01rem;margin-bottom:10px;color:var(--ink)}
.extra-pad p{text-align:justify;color:#57534e;font-size:.93rem}

.prose-page{max-width:760px;margin:0 auto;padding:48px 20px 60px}
.prose-page h1{font-size:1.38rem;color:var(--ink);margin-bottom:16px}
.prose-page p{margin-bottom:12px;color:#57534e}

.site-footer{background:var(--teal-soft);border-top:3px solid var(--teal);padding:28px 20px;text-align:center;font-size:.87rem;color:var(--muted)}
.footer-links{display:flex;flex-wrap:wrap;justify-content:center;gap:8px 16px;margin-bottom:10px}

@media(max-width:860px){
  .nav-toggle{display:flex}
  .site-nav{position:absolute;top:100%;left:0;right:0;background:#fff;border-bottom:2px solid var(--line);padding:12px 20px;display:none;box-shadow:0 8px 20px rgba(0,0,0,.06)}
  .site-nav.is-open{display:block}
  .site-nav ul{flex-direction:column;gap:10px}
  .checker-grid{border-radius:10px 24px 10px 24px}
  .checker-cell{padding:18px 16px;min-height:auto}
  .checker-cell--lead{padding:26px 20px}
}