:root {
  --color-primary: #17394a;
  --color-primary-deep: #102a38;
  --color-accent: #c9672b;
  --color-accent-hover: #a94f1c;
  --color-ink: #24333b;
  --color-muted: #64727a;
  --color-paper: #fff;
  --color-soft: #f1f5f3;
  --color-line: #dbe3df;
  --color-demo: #f7e6d9;
  --font-sans: "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;
  --font-serif: "Yu Mincho", "Hiragino Mincho ProN", serif;
  --space-section: clamp(4.5rem, 9vw, 8rem);
  --radius-sm: 6px;
  --radius-md: 16px;
  --radius-lg: 30px;
  --shadow: 0 18px 50px rgba(20, 48, 61, .12);
  --container: 1160px;
  --header-height: 78px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-height) + 16px); }
body { margin: 0; color: var(--color-ink); background: var(--color-paper); font: 16px/1.8 var(--font-sans); }
body.menu-open { overflow: hidden; }
img { display: block; width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button, input, textarea, select { font: inherit; }
button { cursor: pointer; }
:focus-visible { outline: 3px solid #ef9d62; outline-offset: 3px; }
.skip-link { position: fixed; left: 1rem; top: -5rem; z-index: 200; padding: .7rem 1rem; background: #fff; }
.skip-link:focus { top: 1rem; }
.container { width: min(calc(100% - 40px), var(--container)); margin-inline: auto; }
.section { padding-block: var(--space-section); }
.section-soft { background: var(--color-soft); }
.eyebrow { margin: 0 0 .5rem; color: var(--color-accent); font-size: .78rem; font-weight: 800; letter-spacing: .18em; text-transform: uppercase; }
.section-title { max-width: 780px; margin: 0 0 1.2rem; color: var(--color-primary-deep); font: 700 clamp(2rem, 5vw, 3.35rem)/1.28 var(--font-serif); letter-spacing: .02em; }
.section-lead { max-width: 720px; margin: 0 0 2.5rem; color: var(--color-muted); }
.demo-bar { padding: .35rem 1rem; color: #683719; background: var(--color-demo); text-align: center; font-size: .78rem; font-weight: 800; letter-spacing: .08em; }

.site-header { position: sticky; top: 0; z-index: 100; background: rgba(255,255,255,.95); border-bottom: 1px solid var(--color-line); backdrop-filter: blur(10px); }
.header-inner { min-height: var(--header-height); display: flex; align-items: center; justify-content: space-between; gap: 1.2rem; }
.brand { display: flex; align-items: center; gap: .75rem; color: var(--color-primary-deep); font-weight: 900; font-size: 1.25rem; letter-spacing: .05em; }
.brand-mark { display: grid; place-items: center; width: 42px; aspect-ratio: 1; color: #fff; background: var(--color-primary); border-radius: 50% 50% 44% 56%; font-family: var(--font-serif); }
.nav { display: flex; align-items: center; gap: clamp(.8rem, 2vw, 1.7rem); font-size: .88rem; font-weight: 700; }
.nav a:not(.button) { position: relative; }
.nav a:not(.button)::after { content: ""; position: absolute; left: 0; right: 100%; bottom: -.35rem; height: 2px; background: var(--color-accent); transition: right .2s; }
.nav a:hover::after, .nav a[aria-current="page"]::after { right: 0; }
.menu-toggle { display: none; width: 45px; height: 45px; color: var(--color-primary); background: transparent; border: 1px solid var(--color-line); border-radius: 50%; }

.button { display: inline-flex; min-height: 48px; align-items: center; justify-content: center; gap: .5rem; padding: .75rem 1.3rem; color: #fff; background: var(--color-accent); border: 1px solid var(--color-accent); border-radius: 999px; font-weight: 800; line-height: 1.3; transition: transform .2s, background .2s; }
.button:hover { background: var(--color-accent-hover); transform: translateY(-2px); }
.button-outline { color: var(--color-primary); background: #fff; border-color: var(--color-primary); }
.button-outline:hover { color: #fff; background: var(--color-primary); }
.button-small { min-height: 42px; padding: .55rem 1rem; font-size: .86rem; }
.text-link { color: var(--color-primary); font-weight: 800; text-decoration: underline; text-underline-offset: .35em; }

.hero { position: relative; min-height: min(760px, calc(100vh - 110px)); display: grid; align-items: end; color: #fff; background: #24414c; overflow: hidden; }
.hero::before { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(11,35,45,.92) 0%, rgba(11,35,45,.63) 48%, rgba(11,35,45,.15) 100%), url("images/hero-japanese-homes.jpg") center/cover; }
.hero::after { content: ""; position: absolute; right: -9vw; bottom: -20vw; width: 38vw; aspect-ratio: 1; border: 1px solid rgba(255,255,255,.28); border-radius: 50%; box-shadow: 0 0 0 7vw rgba(255,255,255,.05); }
.hero-content { position: relative; z-index: 1; width: min(780px, 100%); padding-block: clamp(6rem, 12vw, 10rem); }
.hero-kicker { display: inline-flex; gap: .5rem; align-items: center; margin: 0 0 1.2rem; font-weight: 800; letter-spacing: .12em; }
.hero-kicker::before { content: ""; width: 32px; height: 2px; background: var(--color-accent); }
.hero h1 { margin: 0; font: 700 clamp(2.7rem, 7vw, 5.4rem)/1.2 var(--font-serif); letter-spacing: .025em; }
.hero h1 span { color: #f2b181; }
.hero-copy { max-width: 640px; margin: 1.5rem 0 2rem; font-size: clamp(1rem, 2vw, 1.18rem); }
.hero-actions { display: flex; flex-wrap: wrap; gap: .8rem; }
.hero .button-outline { color: #fff; background: transparent; border-color: rgba(255,255,255,.8); }
.hero .button-outline:hover { color: var(--color-primary); background: #fff; }
.hero-note { margin: 1.2rem 0 0; font-size: .78rem; opacity: .78; }

.symptoms-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 1px; background: var(--color-line); border: 1px solid var(--color-line); border-radius: var(--radius-md); overflow: hidden; }
.symptom { min-height: 205px; padding: 1.5rem 1.2rem; background: #fff; }
.symptom-num { color: var(--color-accent); font: 700 2.4rem/1 var(--font-serif); opacity: .5; }
.symptom h3 { margin: 1.2rem 0 .5rem; color: var(--color-primary-deep); font-size: 1.05rem; }
.symptom p { margin: 0; color: var(--color-muted); font-size: .88rem; }

.split { display: grid; grid-template-columns: 1fr 1.08fr; align-items: center; gap: clamp(2rem, 7vw, 6rem); }
.image-frame { position: relative; }
.image-frame img { aspect-ratio: 4/3; object-fit: cover; border-radius: var(--radius-lg) var(--radius-lg) 100px var(--radius-lg); box-shadow: var(--shadow); }
.image-label { position: absolute; right: -1rem; bottom: -1rem; max-width: 220px; padding: 1rem 1.2rem; color: #fff; background: var(--color-primary); border-radius: var(--radius-sm); font-size: .8rem; }
.reason-list { display: grid; gap: 1.7rem; margin-top: 2.2rem; }
.reason { display: grid; grid-template-columns: 56px 1fr; gap: 1rem; }
.reason-index { display: grid; place-items: center; width: 56px; height: 56px; color: #fff; background: var(--color-accent); border-radius: 50%; font: 700 1.15rem var(--font-serif); }
.reason h3 { margin: 0 0 .25rem; color: var(--color-primary-deep); }
.reason p { margin: 0; color: var(--color-muted); }

.service-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.2rem; }
.service-card { position: relative; min-height: 390px; display: flex; flex-direction: column; justify-content: flex-end; padding: 1.6rem; color: #fff; background: var(--color-primary); border-radius: var(--radius-md); overflow: hidden; }
.service-card::before { content: ""; position: absolute; inset: 0; background: linear-gradient(0deg, rgba(8,30,40,.95), rgba(8,30,40,.08)); transition: transform .4s; }
.service-card:nth-child(1) { background: url("images/exterior-detail.jpg") center/cover; }
.service-card:nth-child(2) { background: url("images/roof-work.jpg") center/cover; }
.service-card:nth-child(3) { background: linear-gradient(140deg, #476e72, #17394a); }
.service-card > * { position: relative; z-index: 1; }
.service-card .tag { align-self: flex-start; padding: .15rem .55rem; color: var(--color-primary); background: #fff; border-radius: 99px; font-size: .7rem; font-weight: 800; }
.service-card h3 { margin: .8rem 0 .45rem; font: 700 1.6rem var(--font-serif); }
.service-card p { margin: 0; font-size: .9rem; opacity: .9; }
.service-card a { margin-top: 1rem; font-weight: 800; }

.placeholder-grid { display: grid; grid-template-columns: 1.2fr .8fr .8fr; gap: 1rem; }
.work-placeholder { min-height: 350px; display: flex; flex-direction: column; justify-content: flex-end; padding: 1.5rem; background: linear-gradient(135deg, #d8dfdb, #f8faf9); border: 1px solid var(--color-line); border-radius: var(--radius-md); }
.work-placeholder::before { content: "施工写真"; display: grid; place-items: center; flex: 1; color: #7d8984; font: 700 1.2rem var(--font-serif); border: 1px dashed #aab5b0; border-radius: 10px; }
.work-placeholder h3 { margin: 1rem 0 .2rem; color: var(--color-primary); }
.work-placeholder p { margin: 0; color: var(--color-muted); font-size: .82rem; }

.flow { display: grid; grid-template-columns: repeat(4, 1fr); gap: 2.2rem 1rem; counter-reset: flow; }
.flow-step { position: relative; counter-increment: flow; }
.flow-step::before { content: "0" counter(flow); display: block; margin-bottom: .7rem; color: var(--color-accent); font: 700 2.5rem/1 var(--font-serif); }
.flow-step:not(:nth-child(4n))::after { content: "→"; position: absolute; right: -.75rem; top: .4rem; color: #aab5b0; }
.flow-step h3 { margin: 0 0 .3rem; color: var(--color-primary-deep); font-size: 1.05rem; }
.flow-step p { margin: 0; color: var(--color-muted); font-size: .86rem; }

.faq-list { max-width: 900px; border-top: 1px solid var(--color-line); }
details { border-bottom: 1px solid var(--color-line); }
summary { position: relative; padding: 1.45rem 3rem 1.45rem 2.8rem; color: var(--color-primary-deep); font-weight: 800; list-style: none; cursor: pointer; }
summary::-webkit-details-marker { display: none; }
summary::before { content: "Q"; position: absolute; left: .4rem; color: var(--color-accent); font: 700 1.3rem var(--font-serif); }
summary::after { content: "+"; position: absolute; right: .5rem; font-size: 1.5rem; font-weight: 400; }
details[open] summary::after { content: "−"; }
.faq-answer { padding: 0 3rem 1.5rem 2.8rem; color: var(--color-muted); }

.company-card { display: grid; grid-template-columns: .9fr 1.1fr; background: #fff; border: 1px solid var(--color-line); border-radius: var(--radius-md); overflow: hidden; }
.company-message { padding: clamp(2rem, 6vw, 4rem); color: #fff; background: var(--color-primary); }
.company-message h3 { font: 700 1.8rem var(--font-serif); }
.company-table { padding: clamp(2rem, 6vw, 4rem); }
.data-row { display: grid; grid-template-columns: 130px 1fr; gap: 1rem; padding: 1rem 0; border-bottom: 1px solid var(--color-line); }
.data-row dt { font-weight: 800; }
.data-row dd { margin: 0; color: var(--color-muted); }
.pending { display: inline-block; padding: .1rem .55rem; color: #78451f; background: #f8e9dc; border-radius: 99px; font-size: .78rem; font-weight: 800; }

.contact-wrap { display: grid; grid-template-columns: .75fr 1.25fr; gap: clamp(2rem, 6vw, 5rem); }
.contact-panel { padding: 2rem; color: #fff; background: var(--color-primary); border-radius: var(--radius-md); align-self: start; }
.contact-panel h3 { font: 700 1.8rem var(--font-serif); }
.contact-panel .phone-pending { padding: 1rem; background: rgba(255,255,255,.1); border-radius: var(--radius-sm); }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.field { display: grid; gap: .4rem; }
.field-full { grid-column: 1 / -1; }
.field label { font-weight: 800; font-size: .9rem; }
.required { color: var(--color-accent); font-size: .75rem; }
input, select, textarea { width: 100%; padding: .85rem 1rem; color: var(--color-ink); background: #fff; border: 1px solid #aebbb5; border-radius: var(--radius-sm); }
textarea { min-height: 150px; resize: vertical; }
.checkbox { display: flex; gap: .7rem; align-items: flex-start; font-size: .9rem; }
.checkbox input { width: auto; margin-top: .45rem; }
.form-note { color: var(--color-muted); font-size: .8rem; }
.form-message { display: none; padding: 1rem; color: #235638; background: #e9f6ed; border: 1px solid #9dc8aa; border-radius: var(--radius-sm); }
.form-message.show { display: block; }

.page-hero { padding: clamp(4rem, 10vw, 7rem) 0; color: #fff; background: linear-gradient(135deg, var(--color-primary-deep), var(--color-primary)); }
.page-hero h1 { margin: 0; font: 700 clamp(2.6rem, 6vw, 4.8rem)/1.2 var(--font-serif); }
.page-hero p { max-width: 700px; margin: 1rem 0 0; opacity: .82; }
.page-hero .eyebrow { color: #f2b181; }
.content-grid { display: grid; grid-template-columns: 240px 1fr; gap: clamp(2rem, 7vw, 6rem); }
.side-nav { position: sticky; top: 120px; align-self: start; display: grid; gap: .2rem; }
.side-nav a { padding: .65rem 0; color: var(--color-muted); border-bottom: 1px solid var(--color-line); font-size: .9rem; }
.article-section { padding-bottom: 4rem; }
.article-section h2 { color: var(--color-primary-deep); font: 700 clamp(1.7rem, 4vw, 2.5rem) var(--font-serif); }
.article-section h3 { color: var(--color-primary-deep); }
.info-box { padding: 1.3rem; background: var(--color-soft); border-left: 4px solid var(--color-accent); }
.two-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.plain-card { padding: 1.4rem; border: 1px solid var(--color-line); border-radius: var(--radius-md); }
.plain-card h3 { margin-top: 0; }

.cta-band { padding: 4rem 0; color: #fff; background: var(--color-primary-deep); }
.cta-inner { display: flex; align-items: center; justify-content: space-between; gap: 2rem; }
.cta-band h2 { margin: 0; font: 700 clamp(1.8rem, 4vw, 2.6rem) var(--font-serif); }
.cta-band p { margin: .5rem 0 0; opacity: .75; }
.site-footer { padding: 3rem 0 6rem; color: rgba(255,255,255,.8); background: #0b222d; }
.footer-grid { display: grid; grid-template-columns: 1fr 2fr; gap: 3rem; }
.footer-nav { display: grid; grid-template-columns: repeat(3, 1fr); gap: .7rem 1.3rem; font-size: .86rem; }
.footer-note { margin-top: 2rem; padding-top: 1.5rem; border-top: 1px solid rgba(255,255,255,.15); font-size: .75rem; }
.photo-credit { font-size: .72rem; color: var(--color-muted); }
.photo-credit a { text-decoration: underline; }
.mobile-cta { display: none; }

@media (max-width: 960px) {
  .nav { display: none; position: fixed; inset: calc(var(--header-height) + 27px) 0 0; z-index: 99; padding: 2rem 20px; background: #fff; align-items: stretch; flex-direction: column; font-size: 1.05rem; }
  .nav.open { display: flex; }
  .menu-toggle { display: inline-grid; place-items: center; }
  .symptoms-grid { grid-template-columns: repeat(2, 1fr); }
  .symptom:last-child { grid-column: 1 / -1; }
  .split, .company-card, .contact-wrap { grid-template-columns: 1fr; }
  .service-grid { grid-template-columns: 1fr; }
  .service-card { min-height: 330px; }
  .placeholder-grid { grid-template-columns: 1fr 1fr; }
  .placeholder-grid > :first-child { grid-column: 1 / -1; }
  .flow { grid-template-columns: repeat(2, 1fr); }
  .flow-step:not(:nth-child(4n))::after { display: none; }
  .content-grid { grid-template-columns: 1fr; }
  .side-nav { position: static; grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  :root { --header-height: 68px; --space-section: 4.2rem; }
  .container { width: min(calc(100% - 32px), var(--container)); }
  .hero { min-height: 650px; }
  .hero::before { background: linear-gradient(0deg, rgba(11,35,45,.95), rgba(11,35,45,.45)), url("images/hero-japanese-homes.jpg") center/cover; }
  .symptoms-grid, .placeholder-grid, .form-grid, .two-cards { grid-template-columns: 1fr; }
  .symptom:last-child, .placeholder-grid > :first-child, .field-full { grid-column: auto; }
  .flow { grid-template-columns: 1fr 1fr; }
  .image-label { right: .5rem; bottom: -.8rem; }
  .data-row { grid-template-columns: 1fr; gap: .25rem; }
  .cta-inner, .footer-grid { align-items: flex-start; flex-direction: column; display: flex; }
  .footer-nav { grid-template-columns: 1fr 1fr; }
  .mobile-cta { position: fixed; z-index: 110; left: 0; right: 0; bottom: 0; display: grid; grid-template-columns: 1fr 1fr; background: #fff; box-shadow: 0 -5px 20px rgba(0,0,0,.15); }
  .mobile-cta a { min-height: 58px; display: grid; place-items: center; color: #fff; background: var(--color-primary); font-weight: 800; }
  .mobile-cta a:last-child { background: var(--color-accent); }
  .site-footer { padding-bottom: 7rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; }
}