:root {
  --main: #b51f24;
  --main-dark: #151515;
  --text: #222;
  --muted: #666;
  --bg-soft: #f7f4f2;
  --line: #ded8d4;
  --white: #fff;
  --black: #111;
  --max-width: 1120px;
  --logo-width: 280px;
  --logo-height: 60px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--text);
  background: var(--white);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Kaku Gothic ProN", "Yu Gothic", "YuGothic", "Noto Sans JP", sans-serif;
  line-height: 1.8;
}
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
.container { width: min(calc(100% - 40px), var(--max-width)); margin-inline: auto; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(17,17,17,.98);
  border-bottom: 1px solid #2b2b2b;
}
.site-header__inner {
  width: min(calc(100% - 40px), var(--max-width));
  min-height: 74px;
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.logo img { width: auto; max-width: var(--logo-width); max-height: var(--logo-height); }
.site-nav { display: flex; align-items: center; gap: 24px; color: #fff; font-size: .9rem; font-weight: 700; }
.site-nav a { transition: opacity .2s; }
.site-nav a:hover { opacity: .7; }
.site-nav__contact { padding: 11px 18px; background: var(--main); }

.hero {
  position: relative;
  min-height: 640px;
  display: grid;
  place-items: center;
  overflow: hidden;
  color: var(--white);
}
.hero-slider, .hero-slide, .hero-overlay { position: absolute; inset: 0; }
.hero-slide { opacity: 0; transition: opacity 1.2s ease; }
.hero-slide.is-active { opacity: 1; }
.hero-slide img { width: 100%; height: 100%; object-fit: cover; }
.hero-overlay { background: linear-gradient(90deg, rgba(0,0,0,.68) 0%, rgba(0,0,0,.42) 48%, rgba(0,0,0,.10) 100%); }
.hero-content { position: relative; z-index: 2; width: min(calc(100% - 40px), var(--max-width)); }
.hero-kicker { margin: 0 0 10px; font-size: .78rem; letter-spacing: .2em; font-weight: 700; }
.hero h1 { margin: 0; max-width: 760px; font-size: clamp(2.2rem, 5vw, 4.7rem); line-height: 1.25; letter-spacing: .04em; }
.hero-lead { margin: 24px 0 30px; max-width: 680px; font-size: clamp(1rem, 2vw, 1.18rem); }
.hero-dots { position: absolute; z-index: 3; bottom: 28px; display: flex; gap: 10px; }
.hero-dots span { width: 36px; height: 3px; background: rgba(255,255,255,.45); }
.hero-dots span.is-active { background: var(--white); }
.button { display: inline-flex; min-width: 190px; justify-content: center; align-items: center; padding: 14px 24px; font-weight: 800; }
.button--primary { color: var(--white); background: var(--main); }

.section { padding: 96px 0; }
.section--soft { background: var(--bg-soft); }
.section-label { margin: 0 0 6px; color: var(--main); font-size: .78rem; font-weight: 800; letter-spacing: .16em; }
.section-title { margin: 0 0 42px; font-size: clamp(1.8rem, 3vw, 2.7rem); line-height: 1.35; }
.intro { display: grid; grid-template-columns: 1.05fr .95fr; gap: 56px; align-items: center; }
.intro__text .lead { margin-top: 0; font-size: 1.18rem; font-weight: 700; }
.intro__image img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; }

.sale-note { margin-top: 28px; padding: 18px 20px; border-left: 4px solid var(--main); background: #fff; box-shadow: 0 10px 24px rgba(0,0,0,.05); }
.sale-note__label { display: block; color: var(--main); font-size: .78rem; font-weight: 800; letter-spacing: .08em; }
.sale-note strong { display: block; margin-top: 4px; font-size: 1.05rem; }

.product-intro { margin: -18px 0 30px; color: var(--muted); }
.product-details { margin-top: 14px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); background: #fff; }
.product-summary { position: relative; padding: 20px 58px 20px 22px; font-weight: 800; cursor: pointer; list-style: none; }
.product-summary::-webkit-details-marker { display: none; }
.product-summary::after { content: "＋"; position: absolute; top: 50%; right: 22px; transform: translateY(-50%); color: var(--main); font-size: 1.5rem; }
.product-details[open] .product-summary::after { content: "−"; }
.product-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; padding: 32px 22px 28px; border-top: 1px solid var(--line); }
.product-card { display: flex; justify-content: center; align-items: center; min-height: 180px; border: 1px solid #eee; background: #fff; }
.product-card img { width: 100%; height: auto; object-fit: contain; }

.guide-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }
.guide-card { position: relative; min-height: 150px; padding: 28px 66px 28px 28px; display: flex; flex-direction: column; justify-content: center; background: var(--black); color: #fff; border-top: 4px solid var(--main); transition: transform .2s, opacity .2s; }
.guide-card:hover { transform: translateY(-2px); opacity: .92; }
.guide-card__label { margin-bottom: 8px; color: #ddd; font-size: .74rem; font-weight: 800; letter-spacing: .14em; }
.guide-card strong { font-size: 1.18rem; }
.guide-card__arrow { position: absolute; top: 50%; right: 28px; transform: translateY(-50%); color: var(--main); font-size: 1.6rem; font-weight: 900; }
.guide-note { margin: 16px 0 0; color: var(--muted); font-size: .9rem; }

.company-table { margin: 0; border-top: 1px solid var(--line); }
.company-table > div { display: grid; grid-template-columns: 180px 1fr; border-bottom: 1px solid var(--line); }
.company-table dt, .company-table dd { margin: 0; padding: 20px 18px; }
.company-table dt { font-weight: 800; }

.site-footer { margin-top: 80px; }
.footer-contact { background: var(--black); color: #fff; padding: 48px 20px; border-top: 5px solid var(--main); }
.footer-contact .inner { max-width: 1100px; margin: 0 auto; }
.footer-contact__title { margin: 0 0 24px; text-align: center; font-size: 1.25rem; font-weight: 700; letter-spacing: .08em; }
.footer-contact__list { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; margin: 0; padding: 0; list-style: none; }
.footer-contact__item { display: flex; align-items: center; min-height: 58px; padding: 10px 22px; background: #fff; color: #222; border-radius: 4px; }
.footer-contact__label { flex-shrink: 0; margin-right: 14px; padding-right: 14px; border-right: 1px solid #ccc; font-size: .75rem; font-weight: 700; letter-spacing: .08em; }
.footer-contact__link { color: var(--main); font-size: 1rem; font-weight: 700; }
.footer-contact__text { font-size: 1rem; font-weight: 700; }
.footer-bottom { padding: 24px 20px; background: var(--bg-soft); color: #333; text-align: center; }
.footer-temporary { margin: 0 0 10px; font-size: .8rem; opacity: .75; }
.footer-copyright { margin: 0; font-size: .75rem; opacity: .65; color: #666; }

@media (min-width: 769px) {
  .tel-link { pointer-events: none; color: #222; cursor: default; }
}

@media (max-width: 900px) {
  .site-nav { display: none; }
  .hero { min-height: 570px; }
  .intro { grid-template-columns: 1fr; gap: 30px; }
  .product-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  .container, .site-header__inner, .hero-content { width: min(calc(100% - 28px), var(--max-width)); }
  .site-header__inner { min-height: 62px; }
  .hero { min-height: 540px; }
  .hero-overlay { background: rgba(0,0,0,.56); }
  .section { padding: 68px 0; }
  .section-title { margin-bottom: 28px; }
  .product-grid { grid-template-columns: 1fr; padding: 24px 16px; }
  .product-intro { margin-top: -10px; }
  .guide-grid { grid-template-columns: 1fr; }
  .company-table > div { grid-template-columns: 1fr; }
  .company-table dt { padding-bottom: 0; }
  .company-table dd { padding-top: 6px; }
  .site-footer { margin-top: 56px; }
  .footer-contact { padding: 36px 20px; }
  .footer-contact__list { display: grid; grid-template-columns: 1fr; gap: 10px; max-width: 480px; margin: 0 auto; }
  .footer-contact__item { width: 100%; min-height: 56px; padding: 10px 16px; }
  .footer-contact__label { width: 60px; margin-right: 14px; padding-right: 14px; }
  .footer-contact__link, .footer-contact__text { font-size: .95rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .hero-slide { transition: none; }
}