:root {
  --c-bg:        #f0f4f8;
  --c-bg-alt:    #e4ecf4;
  --c-bg-dark:   #0e2340;
  --c-fg:        #0e2340;
  --c-fg-inv:    #f0f4f8;
  --c-muted:     #5a7595;
  --c-accent:    #1565c0;
  --c-accent-lt: #4fc3f7;
  --c-border:    #c8d8ea;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 1rem;
  --space-4: 2rem;
  --space-5: 4rem;
  --space-6: 8rem;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;

  --font-display: 'Noto Sans JP', 'Hiragino Kaku Gothic ProN', 'Yu Gothic', sans-serif;
  --font-body:    'Noto Sans JP', 'Hiragino Kaku Gothic ProN', 'Yu Gothic', sans-serif;

  --shadow-card: 0 2px 12px rgba(14,35,64,0.09), 0 1px 3px rgba(14,35,64,0.06);
  --shadow-raised: 0 6px 28px rgba(14,35,64,0.13), 0 2px 8px rgba(14,35,64,0.08);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; background-color: var(--c-bg); }
body { font-family: var(--font-body); color: var(--c-fg); background-color: var(--c-bg); line-height: 1.6; -webkit-font-smoothing: antialiased; }
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; background: none; font: inherit; }

h1 { font-size: clamp(2.2rem, 5vw, 3.8rem); font-weight: 700; line-height: 1.15; letter-spacing: -0.03em; }
h2 { font-size: clamp(1.6rem, 3.5vw, 2.6rem); font-weight: 700; line-height: 1.2; letter-spacing: -0.02em; }
h3 { font-size: clamp(1.1rem, 2vw, 1.5rem); font-weight: 600; line-height: 1.3; }
h4 { font-size: clamp(1rem, 1.5vw, 1.2rem); font-weight: 600; }
p  { font-size: clamp(0.9rem, 1.5vw, 1.05rem); color: var(--c-muted); line-height: 1.7; }
.label-tag { font-size: 0.72rem; font-weight: 600; letter-spacing: 0.12em; text-transform: uppercase; color: var(--c-accent); }

.container { width: min(1160px, 92%); margin-inline: auto; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
.btn { display: inline-flex; align-items: center; gap: var(--space-2); padding: 0.75rem 1.75rem; border-radius: var(--radius-sm); font-weight: 600; font-size: 0.92rem; letter-spacing: 0.02em; transition: opacity 0.2s, box-shadow 0.2s; }
.btn-primary { background-color: var(--c-accent); color: var(--c-fg-inv); box-shadow: var(--shadow-card); }
.btn-primary:hover { opacity: 0.88; box-shadow: var(--shadow-raised); }
.btn-outline { border: 1.5px solid var(--c-accent); color: var(--c-accent); }
.btn-outline:hover { background-color: var(--c-accent); color: var(--c-fg-inv); }
.btn-inv { background-color: var(--c-accent-lt); color: var(--c-fg); }
.btn-inv:hover { opacity: 0.88; }
.section-head { margin-bottom: var(--space-5); margin-inline: auto; max-width: 56ch; text-align: center; }
.section-head .label-tag { margin-bottom: var(--space-2); display: block; }
.section-head h2 { margin-bottom: var(--space-3); }
.section-head p { max-width: 100%; }
.img-placeholder { background-color: var(--c-bg-alt); border-radius: var(--radius-md); display: flex; align-items: center; justify-content: center; overflow: visible; }
.img-placeholder::after { content: ''; display: block; width: 48px; height: 48px; border-radius: 50%; background-color: var(--c-border); }

.site-header { position: sticky; top: 0; z-index: 100; background-color: var(--c-bg); border-bottom: 1px solid var(--c-border); }
.site-header__inner { display: flex; align-items: center; gap: var(--space-3); padding-block: var(--space-3); }
.site-header__logo { display: flex; align-items: center; gap: var(--space-2); flex-shrink: 0; }
.site-header__logo img { width: 36px; height: 36px; }
.site-header__brand { font-family: var(--font-display); font-weight: 700; font-size: 1.15rem; letter-spacing: -0.02em; color: var(--c-fg); }
.site-header__brand span { color: var(--c-accent); }

.hero { background-color: var(--c-bg-dark); color: var(--c-fg-inv); padding-block: var(--space-6); overflow: visible; }
.hero__inner { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-5); align-items: center; }
.hero__content { display: flex; flex-direction: column; gap: var(--space-4); }
.hero__content .label-tag { color: var(--c-accent-lt); }
.hero__content h1 { color: var(--c-fg-inv); }
.hero__content p { color: #94b4cc; font-size: clamp(1rem, 1.8vw, 1.15rem); max-width: 44ch; }
.hero__actions { display: flex; gap: var(--space-3); flex-wrap: wrap; }
.hero__visual { aspect-ratio: 4/3; border-radius: var(--radius-lg); background-color: #162f4e; border: 1px solid #1e3f65; display: flex; align-items: center; justify-content: center; position: relative; }
.hero__visual-inner { width: 80%; height: 80%; background-color: #1a3a5e; border-radius: var(--radius-md); border: 1px solid #26517e; }

.intro { padding-block: var(--space-6); background-color: var(--c-bg); }
.intro__inner { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-5); align-items: center; }
.intro__text { display: flex; flex-direction: column; gap: var(--space-3); }
.intro__stats { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-3); }
.intro__stat { background-color: var(--c-bg-alt); border-radius: var(--radius-md); padding: var(--space-4); border: 1px solid var(--c-border); }
.intro__stat strong { display: block; font-size: clamp(1.8rem, 3vw, 2.5rem); font-weight: 700; color: var(--c-accent); }
.intro__stat span { font-size: 0.88rem; color: var(--c-muted); }

.features { padding-block: var(--space-6); background-color: var(--c-bg-dark); color: var(--c-fg-inv); }
.features .section-head h2 { color: var(--c-fg-inv); }
.features .section-head p { color: #94b4cc; }
.features__grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-3); }
.feature-card { background-color: #162f4e; border-radius: var(--radius-md); padding: var(--space-4); border: 1px solid #1e3f65; box-shadow: var(--shadow-card); display: flex; flex-direction: column; gap: var(--space-3); text-align: left; }
.feature-card__icon { width: 48px; height: 48px; border-radius: var(--radius-sm); background-color: #1565c0; display: flex; align-items: center; justify-content: center; flex-shrink: 0; margin-bottom: var(--space-1); }
.feature-card__icon svg { width: 24px; height: 24px; display: block; }
.feature-card h3 { color: var(--c-fg-inv); font-size: 1.05rem; margin-bottom: var(--space-1); }
.feature-card p { color: #7ea9c8; font-size: 0.9rem; line-height: 1.6; }

.how { padding-block: var(--space-6); background-color: var(--c-bg); }
.how__steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-3); counter-reset: step; }
.step-card { display: flex; flex-direction: column; gap: var(--space-3); padding: var(--space-4); background-color: var(--c-bg); border-radius: var(--radius-md); border: 1px solid var(--c-border); box-shadow: var(--shadow-card); position: relative; }
.step-card__num { font-size: 2.5rem; font-weight: 700; color: var(--c-bg-alt); line-height: 1; user-select: none; }
.step-card h3 { font-size: 1rem; }
.step-card p { font-size: 0.88rem; }

.products { padding-block: var(--space-6); background-color: var(--c-bg-alt); }
.products__grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-4); }
.product-card { background-color: var(--c-bg); border-radius: var(--radius-md); box-shadow: var(--shadow-card); overflow: visible; display: flex; flex-direction: column; border: 1px solid var(--c-border); }
.product-card__image { aspect-ratio: 4/3; background-color: var(--c-bg-alt); border-radius: var(--radius-md) var(--radius-md) 0 0; display: flex; align-items: center; justify-content: center; }
.product-card__image::after { content: ''; display: block; width: 64px; height: 64px; border-radius: 50%; background-color: var(--c-border); }
.product-card__body { padding: var(--space-4); display: flex; flex-direction: column; gap: var(--space-2); flex: 1; text-align: left; }
.product-card__body .label-tag { margin-bottom: var(--space-1); }
.product-card__price { font-size: 1.4rem; font-weight: 700; color: var(--c-accent); margin: var(--space-2) 0; }
.product-card__price span { font-size: 0.85rem; font-weight: 400; color: var(--c-muted); }
.product-card h3 { font-size: 1.05rem; margin-bottom: var(--space-2); }
.product-card p { font-size: 0.88rem; flex: 1; line-height: 1.6; }
.product-card .btn { margin-top: auto; align-self: flex-start; }

.benefits { padding-block: var(--space-6); background-color: var(--c-bg-dark); color: var(--c-fg-inv); }
.benefits__inner { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-5); align-items: center; }
.benefits__visual { aspect-ratio: 1/1; border-radius: var(--radius-lg); background-color: #162f4e; border: 1px solid #1e3f65; display: flex; align-items: center; justify-content: center; }
.benefits__visual-inner { width: 75%; height: 75%; border-radius: var(--radius-md); background-color: #1a3a5e; border: 1px solid #26517e; }
.benefits__text { display: flex; flex-direction: column; gap: var(--space-4); }
.benefits__text .label-tag { color: var(--c-accent-lt); }
.benefits__text h2 { color: var(--c-fg-inv); }
.benefits__text > p { color: #94b4cc; }
.benefits__list { display: flex; flex-direction: column; gap: var(--space-3); }
.benefit-item { display: flex; gap: var(--space-3); align-items: flex-start; text-align: left; }
.benefit-item__dot { width: 8px; height: 8px; border-radius: 50%; background-color: var(--c-accent-lt); flex-shrink: 0; margin-top: 0.65rem; }
.benefit-item p { color: #94b4cc; font-size: 0.92rem; margin: 0; line-height: 1.6; }
.benefit-item h4 { color: var(--c-fg-inv); margin-bottom: var(--space-1); font-size: 0.96rem; }

.metrics { padding-block: var(--space-5); background-color: var(--c-accent); color: var(--c-fg-inv); }
.metrics__grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-4); text-align: center; }
.metric-item strong { display: block; font-size: clamp(2rem, 4vw, 3rem); font-weight: 700; line-height: 1; }
.metric-item span { font-size: 0.88rem; opacity: 0.85; }

.case-study { padding-block: var(--space-6); background-color: var(--c-bg); }
.case-study__inner { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-5); align-items: start; }
.case-study__image { aspect-ratio: 4/3; background-color: var(--c-bg-alt); border-radius: var(--radius-lg); border: 1px solid var(--c-border); display: flex; align-items: center; justify-content: center; }
.case-study__image::after { content: ''; display: block; width: 80px; height: 80px; border-radius: 50%; background-color: var(--c-border); }
.case-study__content { display: flex; flex-direction: column; gap: var(--space-3); }
.case-study__result { background-color: var(--c-bg-alt); border-radius: var(--radius-md); padding: var(--space-4); border: 1px solid var(--c-border); display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-3); margin-top: var(--space-2); }
.case-result-item strong { display: block; font-size: 1.5rem; font-weight: 700; color: var(--c-accent); }
.case-result-item span { font-size: 0.8rem; color: var(--c-muted); }

.testimonials { padding-block: var(--space-6); background-color: var(--c-bg-alt); }
.testimonials__grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-3); }
.testimonial-card { background-color: var(--c-bg); border-radius: var(--radius-md); padding: var(--space-4); box-shadow: var(--shadow-card); border: 1px solid var(--c-border); display: flex; flex-direction: column; gap: var(--space-3); text-align: left; }
.testimonial-card__quote { font-size: 0.95rem; color: var(--c-fg); line-height: 1.7; flex: 1; }
.testimonial-card__quote::before { content: '\201C'; font-size: 2rem; line-height: 0; vertical-align: -0.5rem; color: var(--c-accent); margin-right: var(--space-1); display: block; margin-left: calc(var(--space-1) * -1); }
.testimonial-card__author { display: flex; align-items: center; gap: var(--space-3); padding-top: var(--space-3); border-top: 1px solid var(--c-border); }
.testimonial-card__avatar { width: 40px; height: 40px; border-radius: 50%; background-color: var(--c-bg-alt); flex-shrink: 0; border: 2px solid var(--c-border); }
.testimonial-card__name { font-weight: 600; font-size: 0.88rem; margin-bottom: var(--space-1); }
.testimonial-card__role { font-size: 0.78rem; color: var(--c-muted); margin: 0; }

.faq { padding-block: var(--space-6); background-color: var(--c-bg-dark); color: var(--c-fg-inv); }
.faq .section-head h2 { color: var(--c-fg-inv); }
.faq .section-head p { color: #94b4cc; }
.faq__inner { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-3); align-items: start; }
.faq-item { border-bottom: 1px solid #1e3f65; padding-block: var(--space-3); }
.faq-item__q { display: flex; justify-content: space-between; align-items: center; cursor: pointer; gap: var(--space-3); }
.faq-item__q h4 { color: var(--c-fg-inv); font-size: 0.95rem; flex: 1; }
.faq-item__toggle { width: 24px; height: 24px; border-radius: 50%; border: 1.5px solid #3060a0; display: flex; align-items: center; justify-content: center; flex-shrink: 0; color: var(--c-accent-lt); font-size: 1.1rem; }
.faq-item__a { padding-top: var(--space-2); color: #7ea9c8; font-size: 0.9rem; line-height: 1.7; display: none; }
.faq-item.open .faq-item__a { display: block; }
.faq-item.open .faq-item__toggle { background-color: var(--c-accent); border-color: var(--c-accent); }

.partners { padding-block: var(--space-5); background-color: var(--c-bg); border-top: 1px solid var(--c-border); border-bottom: 1px solid var(--c-border); }
.partners__label { text-align: center; margin-bottom: var(--space-4); }
.partners__row { display: flex; align-items: center; justify-content: center; gap: var(--space-5); flex-wrap: wrap; }
.partner-logo { width: 110px; height: 40px; background-color: var(--c-bg-alt); border-radius: var(--radius-sm); border: 1px solid var(--c-border); display: flex; align-items: center; justify-content: center; }
.partner-logo span { font-size: 0.78rem; font-weight: 600; color: var(--c-muted); letter-spacing: 0.06em; }

.contact { padding-block: var(--space-6); background-color: var(--c-bg-alt); }
.contact__inner { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-5); }
.contact__info { display: flex; flex-direction: column; gap: var(--space-4); }
.contact__detail { display: flex; gap: var(--space-3); align-items: flex-start; }
.contact__detail-icon { width: 40px; height: 40px; border-radius: var(--radius-sm); background-color: var(--c-accent); display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.contact__detail-icon svg { width: 18px; height: 18px; color: var(--c-fg-inv); }
.contact__detail strong { display: block; font-size: 0.85rem; color: var(--c-muted); font-weight: 400; }
.contact__detail span { font-size: 0.95rem; font-weight: 600; color: var(--c-fg); }
.contact__form { background-color: var(--c-bg); border-radius: var(--radius-lg); padding: var(--space-5); box-shadow: var(--shadow-card); border: 1px solid var(--c-border); display: flex; flex-direction: column; gap: var(--space-3); }
.form-group { display: flex; flex-direction: column; gap: var(--space-1); }
.form-group label { font-size: 0.85rem; font-weight: 600; color: var(--c-fg); }
.form-group input, .form-group textarea, .form-group select {
  padding: 0.7rem 1rem; border: 1.5px solid var(--c-border); border-radius: var(--radius-sm);
  font: inherit; font-size: 0.92rem; color: var(--c-fg); background-color: var(--c-bg);
  width: 100%; outline: none;
}
.form-group input:focus, .form-group textarea:focus, .form-group select:focus { border-color: var(--c-accent); }
.form-group textarea { resize: vertical; min-height: 120px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-3); }

.site-footer { background-color: var(--c-bg-dark); color: var(--c-fg-inv); padding-block: var(--space-5); }
.site-footer__inner { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: var(--space-5); padding-bottom: var(--space-4); border-bottom: 1px solid #1e3f65; }
.footer-brand { display: flex; flex-direction: column; gap: var(--space-3); }
.footer-brand__logo { display: flex; align-items: center; gap: var(--space-2); }
.footer-brand__logo img { width: 32px; height: 32px; }
.footer-brand__name { font-weight: 700; font-size: 1rem; color: var(--c-fg-inv); }
.footer-brand p { color: #7ea9c8; font-size: 0.88rem; max-width: 32ch; }
.footer-col h4 { font-size: 0.82rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--c-accent-lt); margin-bottom: var(--space-3); }
.footer-col ul { display: flex; flex-direction: column; gap: var(--space-2); }
.footer-col ul li a { color: #7ea9c8; font-size: 0.88rem; }
.footer-col ul li a:hover { color: var(--c-fg-inv); }
.site-footer__bottom { display: flex; justify-content: space-between; align-items: center; padding-top: var(--space-4); gap: var(--space-3); flex-wrap: wrap; }
.site-footer__bottom p { color: #4a6a88; font-size: 0.82rem; }
.footer-legal { display: flex; gap: var(--space-4); }
.footer-legal a { color: #4a6a88; font-size: 0.82rem; }
.footer-legal a:hover { color: #7ea9c8; }

.cookie-banner { position: fixed; bottom: 0; left: 0; right: 0; z-index: 1000; background-color: var(--c-fg); color: var(--c-fg-inv); padding: var(--space-3) var(--space-4); display: flex; align-items: center; justify-content: space-between; gap: var(--space-4); flex-wrap: wrap; border-top: 3px solid var(--c-accent); }
.cookie-banner p { font-size: 0.85rem; color: #ccd8e8; }
.cookie-banner a { color: var(--c-accent-lt); text-decoration: underline; }
.cookie-banner__actions { display: flex; gap: var(--space-2); flex-shrink: 0; }
.cookie-btn-accept { padding: 0.5rem 1.25rem; background-color: var(--c-accent); color: var(--c-fg-inv); border-radius: var(--radius-sm); font-size: 0.85rem; font-weight: 600; cursor: pointer; border: none; }
.cookie-btn-reject { padding: 0.5rem 1.25rem; background-color: transparent; color: #ccd8e8; border-radius: var(--radius-sm); font-size: 0.85rem; border: 1px solid #3a5070; cursor: pointer; }

@media (max-width: 1024px) {
  .hero__inner { grid-template-columns: 1fr; gap: var(--space-4); }
  .hero__visual { aspect-ratio: 16/9; }
  .intro__inner { grid-template-columns: 1fr; }
  .features__grid { grid-template-columns: 1fr 1fr; }
  .how__steps { grid-template-columns: 1fr 1fr; }
  .products__grid { grid-template-columns: 1fr 1fr; }
  .benefits__inner { grid-template-columns: 1fr; }
  .metrics__grid { grid-template-columns: 1fr 1fr; gap: var(--space-4); }
  .case-study__inner { grid-template-columns: 1fr; }
  .testimonials__grid { grid-template-columns: 1fr 1fr; }
  .faq__inner { grid-template-columns: 1fr; }
  .contact__inner { grid-template-columns: 1fr; }
  .site-footer__inner { grid-template-columns: 1fr 1fr; gap: var(--space-4); }
}

@media (max-width: 640px) {
  :root { --space-5: 3rem; --space-6: 4rem; }
  .features__grid { grid-template-columns: 1fr; }
  .how__steps { grid-template-columns: 1fr; }
  .products__grid { grid-template-columns: 1fr; }
  .metrics__grid { grid-template-columns: 1fr 1fr; }
  .testimonials__grid { grid-template-columns: 1fr; }
  .site-footer__inner { grid-template-columns: 1fr; gap: var(--space-4); }
  .site-footer__bottom { flex-direction: column; align-items: flex-start; }
  .footer-legal { flex-wrap: wrap; }
  .form-row { grid-template-columns: 1fr; }
  .intro__stats { grid-template-columns: 1fr 1fr; }
  .cookie-banner { flex-direction: column; align-items: flex-start; }
  .hero__actions { flex-direction: column; }
}