: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;overflow-wrap:break-word}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 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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}}.contact-form-section{margin-top:2rem}.contact-label{display:flex;flex-direction:column;gap:6px;margin-bottom:1.2rem;font-size:.95rem;color:var(--ink)}.contact-input{padding:10px 14px;border:1px solid var(--border);border-radius:8px;background:var(--card);color:var(--ink);font-family:inherit;font-size:1rem;transition:border-color .2s ease;width:100%;max-width:560px}.contact-input:focus{outline:none;border-color:var(--accent)}.contact-textarea{resize:vertical;min-height:120px}.contact-submit{display:inline-flex;align-items:center;justify-content:center;padding:10px 28px;border:none;border-radius:6px;background:var(--accent);color:#fff;font-family:inherit;font-size:.95rem;font-weight:600;cursor:pointer;transition:opacity .2s ease}.contact-submit:hover:not(:disabled){opacity:.88}.contact-submit:disabled{opacity:.5;cursor:not-allowed}.contact-status{margin-top:1rem;font-size:.95rem}.contact-status--ok{color:var(--accent)}.contact-status--err{color:#c62828}@media(prefers-color-scheme:dark){.contact-status--err{color:#ef9a9a}}@media(prefers-reduced-motion:reduce){.reveal{animation:none}}.site-header.has-hero{position:relative;z-index:auto;background:0 0;border-bottom:0}.hero-bg{position:absolute;inset:0 0 -140px;z-index:-1;overflow:hidden;-webkit-mask-image:linear-gradient(to bottom,#000 35%,rgba(0,0,0,.45) 62%,rgba(0,0,0,.12) 82%,transparent);mask-image:linear-gradient(to bottom,#000 35%,rgba(0,0,0,.45) 62%,rgba(0,0,0,.12) 82%,transparent)}.hero-bg picture{display:block;height:100%}.hero-bg img{display:block;width:100%;height:100%;object-fit:cover}.hero-bg::after{content:"";position:absolute;inset:0;background:radial-gradient(ellipse 55% 60% at 50% 45%,rgba(0,0,0,.6),transparent)}.has-hero .header-content{flex-direction:column;justify-content:center;align-items:center;text-align:center;gap:22px;padding:80px 0 72px}.has-hero .site-logo-link{color:#fff}.has-hero .site-title{font-size:clamp(2rem,6vw,3.4rem);letter-spacing:.01em;text-shadow:0 2px 18px rgba(0,0,0,.8)}.has-hero .main-nav ul{justify-content:center;gap:10px}.has-hero .main-nav .nav-link{display:inline-block;padding:6px 14px;border:1px solid rgba(255,255,255,.22);border-radius:999px;background:rgba(10,10,12,.6);color:#eee;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}.has-hero .main-nav .nav-link:hover,.has-hero .main-nav .nav-link:focus{color:var(--accent);border-color:var(--accent)}@media(max-width:640px){.has-hero .header-content{align-items:center;padding:52px 0 64px}.has-hero .main-nav ul{gap:8px}}