:root{--ink:#24303a;--muted:#687680;--green:#19755b;--green2:#eaf6f1;--cream:#f8f6f0;--line:#dde5e1;--white:#fff;--orange:#ef7b45}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans JP",sans-serif;color:var(--ink);line-height:1.8;background:#fff}
a{color:inherit;text-decoration:none}.wrap{width:min(1120px,calc(100% - 40px));margin:auto}.narrow{width:min(760px,calc(100% - 40px))}
.site-header{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.94);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.header-inner{min-height:70px;display:flex;align-items:center;justify-content:space-between;gap:20px}.logo{font-weight:800}.site-header nav{display:flex;gap:24px;font-size:14px;color:#4b5b64}
.hero{padding:90px 0 70px;background:linear-gradient(135deg,#f6fbf8,#eef5f1)}.hero-grid{display:grid;grid-template-columns:1.35fr .65fr;gap:50px;align-items:center}.eyebrow,.section-kicker{font-size:13px;letter-spacing:.16em;font-weight:800;color:var(--green);text-transform:uppercase}
h1{font-size:clamp(38px,6vw,64px);line-height:1.22;margin:12px 0 24px;letter-spacing:-.03em}h2{font-size:clamp(28px,4vw,42px);line-height:1.35;margin:8px 0 18px}h3{line-height:1.45}.lead{font-size:18px;color:#4f5e66}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:30px}.btn{display:inline-flex;align-items:center;justify-content:center;border-radius:999px;padding:14px 22px;font-weight:800;transition:.2s}.btn.primary{background:var(--green);color:white;box-shadow:0 8px 22px rgba(25,117,91,.18)}.btn.primary:hover{transform:translateY(-1px)}.btn.secondary{background:white;border:1px solid var(--line)}.btn.full{width:100%}.btn.large{padding:17px 28px;font-size:17px}
.pr{font-size:12px;color:#77858c}.hero-card{background:white;border:1px solid var(--line);border-radius:24px;padding:28px;box-shadow:0 20px 60px rgba(43,66,56,.08)}.badge{display:inline-block;background:var(--green2);color:var(--green);font-size:12px;font-weight:800;border-radius:99px;padding:6px 10px}
.hero-card ol{list-style:none;padding:0;margin:20px 0 0}.hero-card li{display:grid;grid-template-columns:80px 1fr;gap:10px;padding:14px 0;border-top:1px solid var(--line)}.hero-card span{color:var(--muted);font-size:14px}
.trust-strip{border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.trust-grid{display:grid;grid-template-columns:repeat(3,1fr)}.trust-grid>div{padding:18px;text-align:center}.trust-grid strong{display:block}.trust-grid span{font-size:13px;color:var(--muted)}
.section{padding:85px 0}.section.alt{background:var(--cream)}.section-intro{color:var(--muted);max-width:720px}.cards{display:grid;gap:18px;margin-top:30px}.cards.three{grid-template-columns:repeat(3,1fr)}.cards.two{grid-template-columns:repeat(2,1fr)}.card{display:block;background:white;border:1px solid var(--line);border-radius:18px;padding:24px;transition:.2s}.card:not(.static):hover{transform:translateY(-3px);box-shadow:0 14px 35px rgba(40,60,50,.08)}.num{font-size:12px;color:var(--green);font-weight:800}.card p{color:var(--muted);font-size:15px}
.topic-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;margin-top:25px}.topic{background:white;border:1px solid var(--line);border-radius:15px;padding:18px}.topic strong{display:block}.topic span{font-size:13px;color:var(--muted)}
.split{display:grid;grid-template-columns:1.2fr .8fr;gap:50px;align-items:start}.checklist{padding:0;list-style:none}.checklist li{padding:10px 0 10px 30px;position:relative;border-bottom:1px solid var(--line)}.checklist li:before{content:"✓";position:absolute;left:0;color:var(--green);font-weight:900}.cta-box{background:var(--green2);border-radius:24px;padding:28px}.cta-box small{display:block;text-align:center;margin-top:10px;color:var(--muted)}
.pill-grid{display:flex;gap:10px;flex-wrap:wrap;margin-top:25px}.pill-grid a{background:white;border:1px solid var(--line);border-radius:999px;padding:10px 16px}
.final-cta{background:#1d332d;color:white;text-align:center;padding:90px 0}.final-cta .pr,.final-cta .micro{color:#b9c9c3}.final-cta .btn{background:white;color:#174c3b}
footer{background:#17201d;color:#dfe8e4;padding:45px 0 20px}.footer-grid{display:flex;justify-content:space-between;gap:30px}.footer-grid p{color:#93a49d}.footer-grid div:last-child{display:flex;gap:18px;flex-wrap:wrap}.copyright{border-top:1px solid #33423d;margin-top:30px;padding-top:18px;font-size:12px;color:#81918b}
@media(max-width:780px){.site-header nav{display:none}.hero{padding:60px 0 45px}.hero-grid,.split{grid-template-columns:1fr}.hero-grid{gap:28px}.cards.three,.cards.two,.topic-grid{grid-template-columns:1fr}.trust-grid{grid-template-columns:1fr}.trust-grid>div{border-bottom:1px solid var(--line)}.section{padding:60px 0}.footer-grid{flex-direction:column}.hero-actions{flex-direction:column}.hero-actions .btn{width:100%}}

.pr-badge{display:inline-block;font-weight:900;font-size:14px;letter-spacing:.04em;background:#fff3cd;color:#6e5200;border:1px solid #e9cf74;border-radius:6px;padding:3px 8px;margin:8px 0 12px}
.pr-inline{font-weight:900;font-size:13px;display:inline-block;margin:0 0 8px}
.affiliate-banner{margin:28px auto;text-align:center}
.affiliate-banner img{max-width:100%;height:auto}
.affiliate-card{border:1px solid var(--line);background:#fff;border-radius:18px;padding:20px;margin:30px 0}
.affiliate-card img{max-width:100%;height:auto}

/* Image integration v1.2 */
.hero-photo-wrap{padding:0 0 28px;background:linear-gradient(135deg,#f6fbf8,#eef5f1)}
.hero-photo{display:block;width:100%;max-height:520px;object-fit:cover;border-radius:24px;box-shadow:0 18px 45px rgba(35,55,45,.10)}
.article-hero{margin:26px 0 34px}
.article-hero img{display:block;width:100%;height:auto;aspect-ratio:4/3;object-fit:cover;border-radius:20px;box-shadow:0 12px 32px rgba(35,55,45,.09)}
.hub-visual{margin:26px 0 30px}
.hub-visual img{display:block;width:100%;max-height:430px;object-fit:cover;border-radius:22px}
.img-caption{font-size:12px;color:var(--muted);margin-top:8px}
@media(max-width:780px){
  .hero-photo{border-radius:16px;max-height:340px}
  .article-hero img,.hub-visual img{border-radius:14px}
}


/* =========================================================
   Responsive image & layout fix v1.3
   ========================================================= */
html,body{max-width:100%;overflow-x:hidden}
img{max-width:100%;height:auto}

/* Article images: do not dominate the page */
.article-hero{
  width:100%;
  max-width:820px;
  margin:24px auto 34px;
}
.article-hero img{
  display:block;
  width:100%;
  max-width:100%;
  height:auto;
  aspect-ratio:16/9;
  object-fit:cover;
  object-position:center;
  border-radius:20px;
}

/* Category/hub images */
.hub-visual{
  width:100%;
  max-width:900px;
  margin:24px auto 32px;
}
.hub-visual img{
  display:block;
  width:100%;
  max-width:100%;
  height:auto;
  aspect-ratio:16/9;
  object-fit:cover;
  object-position:center;
}

/* Top hero image */
.hero-photo-wrap .wrap{max-width:1120px}
.hero-photo{
  width:100%;
  max-width:100%;
  height:auto;
  aspect-ratio:16/9;
  object-fit:cover;
  object-position:center;
}

/* Make containers truly fluid */
.wrap,.narrow{
  max-width:100%;
}

/* Tablet/small desktop: switch earlier to compact navigation */
@media(max-width:960px){
  .site-header nav{display:none}
  .header-inner{min-height:64px}
  .hero-grid,.split{grid-template-columns:1fr}
  .hero-grid{gap:28px}
  .cards.three,.cards.two,.topic-grid{grid-template-columns:1fr}
  .article-hero,.hub-visual{max-width:100%}
}

/* Phones */
@media(max-width:780px){
  .wrap{width:calc(100% - 28px)}
  .narrow{width:calc(100% - 28px)}
  .section{padding:48px 0}
  h1{font-size:clamp(30px,9vw,42px)}
  h2{font-size:clamp(25px,7vw,34px)}
  .lead{font-size:16px}
  .article-hero{
    margin:18px auto 26px;
  }
  .article-hero img{
    border-radius:14px;
    aspect-ratio:16/9;
  }
  .hub-visual img{
    border-radius:14px;
    aspect-ratio:16/9;
  }
  .hero-photo{
    border-radius:14px;
    aspect-ratio:16/9;
  }
}

/* Very small phones */
@media(max-width:480px){
  .wrap,.narrow{width:calc(100% - 22px)}
  .hero{padding:42px 0 34px}
  .btn{padding:13px 16px}
  .article-hero img,.hub-visual img,.hero-photo{
    aspect-ratio:16/10;
  }
}

/* Niche article cluster v1.4 */
.niche-cluster{margin:54px 0}
.niche-card h3{margin-top:0}
.faq-list details{border-bottom:1px solid var(--line);padding:14px 0}
.faq-list summary{font-weight:800;cursor:pointer}
.faq-list p{color:var(--muted);margin:10px 0 0}
.source-box{background:#f7faf8;border:1px solid var(--line);padding:22px;border-radius:16px;margin-top:34px}
.source-box h2{font-size:22px;margin-top:0}
.source-box a{text-decoration:underline;color:var(--green)}
.related-grid{display:grid;grid-template-columns:1fr;gap:10px}
.related-link{display:block;border:1px solid var(--line);border-radius:12px;padding:14px;background:white}
.niche-check{background:var(--cream);border-radius:18px;padding:22px;margin-top:30px}
@media(min-width:800px){.related-grid{grid-template-columns:repeat(3,1fr)}}


/* =========================================================
   Niche article template safeguard v1.4.1
   ========================================================= */
.source-box ul{padding-left:1.25rem}
.niche-check h2{margin-top:0}

@media(min-width:961px){
  .narrow{width:min(820px,calc(100% - 40px))}
}

@media(max-width:960px){
  .narrow{width:min(100% - 32px,820px)}
}

@media(max-width:780px){
  .narrow{width:calc(100% - 28px)}
  .article-hero{
    width:100%;
    max-width:100%;
    margin:20px auto 28px;
  }
  .article-hero img{
    width:100%;
    height:auto;
    aspect-ratio:16/9;
    object-fit:cover;
  }
  .card.static{padding:20px}
  .source-box,.niche-check{padding:18px}
}