:root{--bg:#fafafa;--bg-accent:#f4f4f4;--ink:#212121;--muted:#757575;--accent:#1976d2;--accent-soft:#42a5f5;--card:#ffffff;--border:#e0e0e0;--shadow:0 10px 30px rgba(0, 0, 0, 0.08);--radius:14px}@media(prefers-color-scheme:dark){:root{--bg:#1a1a1a;--bg-accent:#212121;--ink:#e0e0e0;--muted:#9e9e9e;--accent:#64b5f6;--accent-soft:#42a5f5;--card:#1f1f1f;--border:#333333;--shadow:0 18px 40px rgba(0, 0, 0, 0.4)}}*,*::before,*::after{box-sizing:border-box}body{margin:0;min-height:100vh;font-family:avenir next,avenir,segoe ui,sans-serif;color:var(--ink);background:var(--bg);line-height:1.7}html[lang=ja] body{font-family:hiragino mincho pron,yu mincho,yumincho,noto serif jp,serif;letter-spacing:.02em}img{max-width:100%;height:auto}a{color:inherit;text-decoration:none}a:hover,a:focus{color:var(--accent)}.container{width:min(1120px,100%);margin:0 auto;padding:0 28px}.site-header{position:sticky;top:0;z-index:10;background:var(--bg);border-bottom:1px solid var(--border)}.header-content{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:18px 0;flex-wrap:wrap}.site-logo-link{display:inline-flex;align-items:center;gap:12px;font-weight:700;font-size:1.05rem;color:var(--ink)}.logo{width:34px;height:34px;object-fit:contain}.site-title{text-transform:none;letter-spacing:.02em}.main-nav ul{list-style:none;display:flex;gap:16px;padding:0;margin:0;flex-wrap:wrap}.main-nav .nav-link{font-size:.95rem;color:var(--muted);padding-bottom:4px;border-bottom:2px solid transparent;transition:color .2s ease,border-color .2s ease}.main-nav .nav-link:hover,.main-nav .nav-link:focus,.main-nav .nav-link.is-active{color:var(--accent);border-color:var(--accent)}.lang-switcher{display:flex;gap:10px;font-size:.85rem;letter-spacing:.08em}.lang-switcher .lang-link{padding:4px 10px;border-radius:999px;border:1px solid var(--border);color:var(--muted);transition:color .2s ease,border-color .2s ease,background .2s ease}.lang-switcher .lang-link.is-active{color:var(--ink);background:var(--bg-accent);border-color:var(--border)}.main{padding:32px 0 80px}.hero{padding:48px 0 24px}.hero h1{font-size:clamp(2rem,5vw,2.8rem);margin:0 0 1rem;line-height:1.2}.hero .lead{font-size:1.05rem;max-width:640px;color:var(--muted)}.cta{display:inline-flex;align-items:center;justify-content:center;padding:10px 20px;border-radius:6px;background:var(--accent);color:#fff;font-size:.95rem;font-weight:600;box-shadow:var(--shadow)}.cta:hover,.cta:focus{background:#b25029;color:#fff}.highlights{padding:24px 0 32px}.highlight-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:22px}.highlight-card{padding:18px;border-radius:var(--radius);background:var(--card);border:1px solid var(--border)}.highlight-card h3{margin-top:0;font-size:1.05rem}.highlight-card p{margin-bottom:0;color:var(--muted)}.content-block{padding:20px 0 32px}.prose{max-width:880px}.prose h1{font-size:2rem;margin-top:0}.prose h2{margin-top:2.2rem;font-size:1.6rem}.prose h3{margin-top:1.4rem;font-size:1.2rem}.prose p,.prose li{color:var(--muted)}.site-footer{border-top:1px solid var(--border);padding:28px 0 40px}.footer-inner{display:flex;justify-content:space-between;align-items:center;font-size:.9rem;color:var(--muted);gap:16px;flex-wrap:wrap}.reveal{animation:fade-up .8s ease both;animation-delay:var(--delay,0s)}.reveal.delay-50{--delay:0.05s}.reveal.delay-100{--delay:0.1s}.reveal.delay-150{--delay:0.15s}.reveal.delay-200{--delay:0.2s}@keyframes fade-up{from{opacity:0;transform:translateY(18px)}to{opacity:1;transform:translateY(0)}}@media(max-width:900px){.header-content{justify-content:center}}@media(max-width:640px){.header-content{align-items:flex-start;gap:16px}.main-nav ul{gap:12px}.footer-inner{flex-direction:column;text-align:center}}@media(prefers-reduced-motion:reduce){.reveal{animation:none}}