:root{--ink:#123b4b;--muted:#55727c;--blue:#027bff;--deep:#075eaf;--mint:#e9f7f4;--line:#d8e7ec;--paper:#fff;--bg:#f8fcfd;--orange:#f4770b}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Hiragino Kaku Gothic ProN","Yu Gothic",Meiryo,sans-serif;line-height:1.8}a{color:var(--deep)}a:hover{text-decoration-thickness:2px}img{max-width:100%;height:auto}h1,h2,h3,p{margin-top:0}h1,h2,h3{line-height:1.45;letter-spacing:.015em}h2{font-size:clamp(1.65rem,2.6vw,2.35rem)}h3{font-size:1.14rem}.skip-link{position:absolute;left:-999px;top:0;background:#fff;padding:10px;z-index:100}.skip-link:focus{left:10px}.site-header{background:#fff;border-bottom:1px solid var(--line);position:relative;z-index:10}.header-inner{max-width:1200px;min-height:78px;padding:12px 24px;margin:auto;display:flex;align-items:center;gap:32px}.brand{display:flex;align-items:center;flex:none}.brand img{display:block;width:188px;max-height:50px;object-fit:contain;object-position:left}.site-nav{display:flex;align-items:center;gap:26px;margin-left:auto}.site-nav a{font-weight:700;font-size:.91rem;color:var(--ink);text-decoration:none;white-space:nowrap}.site-nav a:hover{color:var(--blue)}.header-contact{display:inline-flex;align-items:center;justify-content:center;gap:12px;white-space:nowrap;background:linear-gradient(100deg,#ffb247,#ff8438);padding:12px 20px;border-radius:12px;color:#fff;font-weight:800;text-decoration:none;box-shadow:0 4px 13px rgba(244,119,11,.18)}main{max-width:1200px;margin:auto;padding:0 24px 60px}.breadcrumb{display:flex;align-items:center;gap:9px;font-size:.8rem;color:var(--muted);padding:15px 0 10px}.breadcrumb a{color:var(--muted)}.hero{min-height:500px;display:grid;grid-template-columns:minmax(0,1.1fr) minmax(320px,.9fr);gap:34px;align-items:center;padding:30px 0 62px}.hero-copy{padding:8px 0}.eyebrow,.kicker{color:#078782;font-weight:850;letter-spacing:.13em;font-size:.77rem;margin-bottom:14px}.hero h1{font-size:clamp(2rem,3.3vw,3rem);line-height:1.35;margin:0 0 22px;color:#075d9f}.hero h1 span{display:block;font-size:.66em;color:var(--ink);margin-top:13px;letter-spacing:0}.hero-lead{font-size:1rem;line-height:2.05;max-width:640px}.hero-actions{display:flex;align-items:center;gap:24px;flex-wrap:wrap;margin:24px 0 13px}.button{display:inline-flex;align-items:center;justify-content:center;gap:18px;text-decoration:none;font-weight:800;line-height:1.4;border-radius:12px;padding:16px 22px;transition:transform .2s,box-shadow .2s}.button:hover{transform:translateY(-2px)}.button.primary{background:var(--blue);color:#fff;box-shadow:0 8px 20px rgba(2,123,255,.23)}.button.secondary{background:#fff;color:var(--deep);border:1px solid #a8d3ff}.button.light{background:#fff;color:#085f9e}.text-link{font-weight:800;text-underline-offset:4px}.hero-note{font-size:.8rem;color:var(--muted);margin:0}.hero-visual{position:relative;margin:0;align-self:stretch;min-height:420px;border-radius:24px;overflow:hidden;box-shadow:0 16px 40px rgba(11,80,117,.16)}.hero-visual img{width:100%;height:100%;min-height:420px;object-fit:cover;object-position:center}.hero-visual figcaption{position:absolute;bottom:16px;left:16px;right:16px;padding:10px 13px;border-radius:8px;background:rgba(255,255,255,.94);font-size:.75rem;color:#40616d;line-height:1.5}.section{padding:76px 0;border-top:1px solid var(--line)}.section-heading{max-width:760px;margin-bottom:30px}.section-heading h2{margin:0 0 10px}.section-heading>p:last-child{margin-bottom:0;color:var(--muted)}.problem-grid,.factor-grid,.case-grid,.technical-grid{display:grid;gap:16px}.problem-grid{grid-template-columns:repeat(4,minmax(0,1fr))}.problem-card,.factor-grid article,.case-card,.technical-grid article{background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:0 6px 22px rgba(13,73,90,.045)}.problem-card{padding:24px 21px 21px;display:flex;flex-direction:column;min-height:245px}.problem-number{font-weight:900;color:var(--blue);font-size:.78rem;letter-spacing:.12em}.problem-card h3{margin:16px 0 10px;min-height:2.8em}.problem-card p{font-size:.88rem;color:var(--muted);line-height:1.8}.problem-card a,.case-card>a,.technical-grid article a{margin-top:auto;font-weight:800;text-decoration:none}.problem-card a:hover,.case-card>a:hover,.technical-grid article a:hover{text-decoration:underline}.factor-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.factor-grid article{padding:28px}.factor-grid article>span{display:grid;place-items:center;width:36px;height:36px;border-radius:50%;background:#dff2ff;color:var(--deep);font-weight:900;margin-bottom:18px}.factor-grid h3{margin-bottom:10px}.factor-grid p{color:var(--muted);font-size:.9rem;margin:0}.caution{background:#fff8e9;border-left:4px solid #f4a33c;border-radius:0 10px 10px 0;margin:22px 0 0;padding:16px 20px;color:#6d5635;font-size:.9rem}.case-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.case-card{padding:23px;display:flex;flex-direction:column}.case-top{display:flex;justify-content:space-between;align-items:center;gap:10px;color:#0e7d80;font-size:.73rem;font-weight:900}.case-top span:first-child{background:#e8f7f3;border-radius:100px;padding:4px 10px}.case-card h3{margin:20px 0 16px;min-height:3em}.case-card dl{margin:0}.case-card dl>div{border-top:1px solid var(--line);padding:10px 0;display:grid;grid-template-columns:58px 1fr;gap:10px;font-size:.83rem;line-height:1.65}.case-card dt{font-weight:800;color:#3f6671}.case-card dd{margin:0}.case-card blockquote,.case-comment{margin:14px 0 20px;padding:14px;border-radius:10px;background:#f4fafc;color:#375b68;font-size:.82rem;line-height:1.8}.case-card>a{display:block;padding-top:9px}.case-note{font-size:.8rem;color:var(--muted);margin:18px 0 0}.selection-grid{display:grid;grid-template-columns:1.25fr .75fr;gap:36px;align-items:start}.selection-grid>div:first-child p{font-size:1rem;line-height:2}.selection-aside{background:#e8f7f8;border-radius:18px;padding:27px}.selection-aside h3{margin-bottom:12px}.selection-aside ul{padding-left:1.3em;margin:0}.selection-aside li{padding:5px 0}.estimate-panel{display:grid;grid-template-columns:1fr 1fr;gap:38px;background:linear-gradient(115deg,#edf7ff,#f3faf7);padding:34px;border-radius:20px}.estimate-panel p{margin-bottom:20px}.estimate-panel h3{margin-bottom:10px}.step-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px;list-style:none;margin:0;padding:0}.step-grid li{background:#fff;border:1px solid var(--line);border-radius:16px;padding:23px}.step-grid li>span{display:block;font-weight:900;color:var(--blue);font-size:1.4rem;margin-bottom:11px}.step-grid h3{margin-bottom:9px}.step-grid p{font-size:.88rem;color:var(--muted);margin:0}.faq-list{display:grid;gap:10px}.faq-list details{background:#fff;border:1px solid var(--line);border-radius:12px;padding:0 20px}.faq-list summary{cursor:pointer;font-weight:800;padding:18px 20px 18px 0}.faq-list details[open] summary{border-bottom:1px solid var(--line)}.faq-list details p{padding-top:15px;margin-bottom:18px;color:var(--muted)}.technical-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.technical-grid article{padding:24px;display:flex;flex-direction:column}.technical-grid article p{font-size:.88rem;color:var(--muted)}.technical-links{margin-top:24px;padding:16px 20px;border-top:1px solid var(--line);display:flex;gap:24px;flex-wrap:wrap;font-size:.88rem}.technical-links a{font-weight:800}.final-cta{border-radius:24px;background:linear-gradient(120deg,#0c6bb7,#05928f);padding:42px 48px;color:#fff;display:grid;grid-template-columns:1fr auto;gap:30px;align-items:center}.final-cta .kicker{color:#c4f5e8}.final-cta h2{margin:0 0 8px;color:#fff}.final-cta p:last-child{margin:0}.cta-actions{display:flex;flex-direction:column;align-items:flex-start;gap:12px}.phone{color:#fff;text-decoration:none;font-size:1.32rem;font-weight:850;line-height:1.35}.phone small{display:block;font-size:.7rem;font-weight:400}.site-footer{max-width:1200px;margin:auto;padding:30px 24px 45px;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:26px;font-size:.83rem;color:var(--muted)}.site-footer p{margin:4px 0 0}.footer-brand{font-size:1.05rem;font-weight:900;text-decoration:none}.site-footer nav{display:flex;gap:20px;flex-wrap:wrap}.site-footer nav a{color:var(--muted)}
@media(max-width:980px){.site-nav{gap:15px}.header-inner{gap:16px}.header-contact{padding:10px 12px}.problem-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.case-grid{grid-template-columns:1fr 1fr}.case-card:last-child{grid-column:1/-1}.step-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.technical-grid{grid-template-columns:1fr 1fr}.technical-grid article:last-child{grid-column:1/-1}}
@media(max-width:720px){.header-inner{padding:12px 18px;min-height:66px;flex-wrap:wrap;gap:10px}.brand img{width:148px;height:auto}.site-nav{order:3;flex-basis:100%;margin:0;overflow-x:auto;padding:6px 0 2px;gap:19px}.site-nav a{font-size:.78rem}.header-contact{margin-left:auto;font-size:.74rem;padding:9px 10px}.header-contact span{display:none}main{padding:0 18px 40px}.hero{display:flex;flex-direction:column;gap:24px;padding:16px 0 42px;min-height:0}.hero-copy{padding:0}.hero h1{font-size:2rem}.hero h1 span{font-size:.62em}.hero-lead{font-size:.94rem;line-height:1.9}.hero-actions{gap:14px}.button{padding:14px 18px}.hero-visual{width:100%;height:270px;min-height:270px}.hero-visual img{min-height:270px}.section{padding:54px 0}.problem-grid,.factor-grid,.case-grid,.technical-grid,.selection-grid,.estimate-panel{grid-template-columns:1fr}.problem-card{min-height:0}.problem-card h3,.case-card h3{min-height:0}.case-card:last-child,.technical-grid article:last-child{grid-column:auto}.selection-grid{gap:20px}.estimate-panel{padding:24px}.final-cta{padding:31px 25px;grid-template-columns:1fr;gap:20px}.site-footer{padding:28px 18px;display:block}.site-footer nav{margin-top:14px}}
@media(max-width:440px){.header-contact{font-size:.68rem;max-width:140px;text-align:center;line-height:1.3}.breadcrumb{font-size:.72rem}.eyebrow{font-size:.72rem}.hero h1{font-size:1.83rem}.hero-actions{align-items:flex-start;flex-direction:column}.button.primary{width:100%}.problem-grid,.step-grid{grid-template-columns:1fr}.step-grid li{padding:18px}.hero-visual{height:230px;min-height:230px}.hero-visual img{min-height:230px}.hero-visual figcaption{font-size:.68rem}.section-heading h2{font-size:1.55rem}.case-card,.factor-grid article{padding:21px}.case-card dl>div{grid-template-columns:53px 1fr}.technical-links{gap:12px;flex-direction:column}}

.explain-photo,.measure-photo{margin:24px 0 0;max-width:774px}
.explain-photo img,.measure-photo img{display:block;width:100%;height:auto;border-radius:14px;border:1px solid var(--line)}
.explain-photo figcaption,.measure-photo figcaption{padding-top:8px;font-size:.8rem;color:var(--muted)}
.case-photo-pair{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:9px;margin:12px 0 18px}
.case-photo-pair figure{margin:0}
.case-photo-pair img{display:block;width:100%;aspect-ratio:1/1;object-fit:cover;border-radius:10px}
.case-photo-pair figcaption{font-size:.75rem;color:var(--muted);padding-top:4px}
@media(max-width:720px){
  .hero{gap:0;align-items:stretch}
  .hero-copy{display:contents}
  .hero .eyebrow{order:1}
  .hero h1{order:2;margin-bottom:20px}
  .hero-visual{order:3;margin-bottom:20px}
  .hero-lead{order:4;margin-bottom:0}
  .hero-actions{order:5;margin:22px 0 13px}
  .hero-note{order:6}
  .explain-photo,.measure-photo{margin-top:20px}
}

.heritage-roof{position:relative;height:clamp(150px,19.5vw,250px);overflow:hidden;background:#d6ebf9 url("assets/sky.jpg") center 16%/cover no-repeat}
.heritage-roof img{position:absolute;display:block;width:min(100%,1280px);max-width:none;height:auto;left:50%;bottom:0;transform:translateX(-50%)}
.library-banner{max-width:774px;margin:0 auto 28px}
.library-banner img{display:block;width:100%;height:auto}
.problem-card-full{grid-column:1/-1;padding:28px;min-height:0}
.problem-card-full-heading{display:flex;align-items:baseline;gap:18px;margin-bottom:18px}
.problem-card-full h3{margin:0;min-height:0;font-size:clamp(1.25rem,2.2vw,1.75rem)}
.ito-case-frame{display:block;width:100%;height:900px;border:1px solid var(--line);border-radius:12px;background:#fff}
@media(max-width:720px){.heritage-roof{display:none}}
@media(max-width:720px){.problem-card-full{padding:20px}.problem-card-full-heading{align-items:flex-start;gap:12px}.ito-case-frame{height:1400px}}

/* Match the published TOP menu without its icon glyphs. */
.header-inner{max-width:1200px;min-height:0;padding:0;margin:auto;display:block}
.site-nav{display:grid;grid-template-columns:1.05fr 1.08fr .92fr 1.02fr 1.08fr 2.25fr;align-items:center;gap:3px;width:100%;min-height:60px;margin:0;padding:7px 8px;background:#fff;border:1px solid #d9eee8;box-shadow:0 4px 10px rgba(22,79,98,.13)}
.site-nav a{display:flex;align-items:center;justify-content:center;min-height:42px;padding:0 7px;border-radius:12px;color:#315a62;background:transparent;font-size:clamp(12px,1.15vw,14px);font-weight:600;line-height:1.2;text-decoration:none;white-space:nowrap}
.site-nav a:first-child{color:#237355;background:#e4f7ef}
.site-nav .header-contact{display:flex;min-height:42px;margin:0;padding:0 7px;color:#fff;background:linear-gradient(90deg,#ffb64d,#ff873c);border-radius:12px;box-shadow:0 4px 11px rgba(224,119,38,.2);font-size:clamp(12px,1.15vw,14px);font-weight:800}
.site-nav .header-contact:hover{color:#fff;background:linear-gradient(90deg,#ffa72f,#f47732)}
.hero-visual{align-self:center;min-height:0;aspect-ratio:auto}
.hero-visual img{display:block;width:100%;height:auto;min-height:0;aspect-ratio:407/291;object-fit:cover}
.hero-visual figcaption{position:static;padding:10px 13px;border-radius:0;background:#fff}
.subsidy-promo{display:none}
@media(max-width:720px){
  .header-inner{padding:8px 12px}
  .site-nav{grid-template-columns:repeat(3,minmax(0,1fr));gap:4px;min-height:0;padding:5px}
  .site-nav a{min-height:38px;padding:4px 3px;font-size:.76rem;white-space:normal;text-align:center}
  .site-nav .header-contact{grid-column:1/-1;min-height:40px;max-width:none;font-size:.82rem}
  .hero-visual{width:100%;height:auto;min-height:0;aspect-ratio:auto}
  .hero-visual img{height:auto;min-height:0}
  .subsidy-promo{display:block;width:min(100%,407px);margin:42px auto 0}
  .subsidy-promo a{display:block;overflow:hidden;background:#fff;border:1px solid #b8dcff;border-radius:18px;box-shadow:0 2px 8px rgba(2,123,255,.13)}
  .subsidy-promo img{display:block;width:100%;height:auto;transform:scale(1.064);clip-path:inset(3% round 6%)}
  .steps{padding-top:32px;border-top:0}
}

.original-explanation-body{display:grid;gap:18px;max-width:950px}
.original-explanation-body article{background:#fff;border:1px solid var(--line);border-radius:18px;padding:26px 30px;box-shadow:0 6px 22px rgba(13,73,90,.045)}
.original-explanation-body h3{font-size:clamp(1.15rem,1.7vw,1.45rem);color:#075d9f;margin-bottom:12px}
.original-explanation-body p{margin:0 0 15px;line-height:1.95}
.original-explanation-body p:last-child{margin-bottom:0}
.original-explanation-body figure{margin:18px 0 0;max-width:774px}
.original-explanation-body figure img{display:block;width:100%;height:auto;border-radius:12px;border:1px solid var(--line)}
.original-explanation-body figcaption{font-size:.8rem;color:var(--muted);padding-top:7px}
.original-explanation-conclusion{max-width:950px;margin:20px 0 0;padding:20px 24px;border-left:5px solid var(--blue);border-radius:0 12px 12px 0;background:#eaf5ff;font-size:1rem;line-height:1.9}
.original-explanation-source{max-width:950px;margin:20px 0 0;font-size:.84rem;color:var(--muted)}
@media(max-width:720px){.original-explanation-body article{padding:22px 19px}.original-explanation-body h3{font-size:1.2rem}}