:root{--ink:#0d1d2a;--navy:#0d2940;--blue:#0f6ea8;--sea:#12a6b4;--sky:#eaf7fb;--sand:#f7f3eb;--white:#fff;--muted:#667784;--line:#dce8ee;--shadow:0 18px 45px rgba(9,35,53,.12)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans JP","Yu Gothic",sans-serif;color:var(--ink);background:#fff;line-height:1.7}img{max-width:100%;display:block}a{text-decoration:none;color:inherit}.container{width:min(1120px,calc(100% - 36px));margin:auto}.site-header{position:fixed;inset:0 0 auto;z-index:50;background:rgba(6,24,38,.74);backdrop-filter:blur(12px);border-bottom:1px solid rgba(255,255,255,.15)}.nav{height:72px;display:flex;align-items:center;justify-content:space-between;gap:24px}.brand{font-weight:900;color:#fff;letter-spacing:.04em}.brand span{display:block;font-size:.72rem;font-weight:600;opacity:.72}.nav-links{display:flex;gap:22px;align-items:center;color:#fff;font-size:.92rem}.nav-links a{opacity:.9}.nav-links 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solid var(--line);box-shadow:0 10px 30px rgba(20,50,70,.06)}.social-card h3{font-size:1.8rem;margin:0 0 8px}.social-card p{margin:0;color:var(--muted)}.social-badge{display:inline-block;margin-bottom:14px;font-size:.78rem;font-weight:900;letter-spacing:.12em;text-transform:uppercase;color:var(--sea)}.social-link{display:inline-flex;margin-top:18px;font-weight:900;color:var(--blue)}.faq{max-width:840px;margin:auto}.faq-item{border-bottom:1px solid var(--line)}.faq-q{width:100%;padding:22px 0;border:0;background:transparent;text-align:left;font:inherit;font-weight:900;display:flex;justify-content:space-between;cursor:pointer}.faq-a{display:none;padding:0 0 22px;color:var(--muted)}.faq-item.open .faq-a{display:block}.cta-section{padding:90px 0;background:linear-gradient(135deg,#0b3350,#0e7c9a);color:#fff;text-align:center}.cta-section h2{font-size:clamp(2.1rem,5vw,4rem);line-height:1.1;margin:0 0 14px}.cta-section p{max-width:650px;margin:0 auto 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