:root{color-scheme:dark;--bg: #0f1013;--surface: #18191d;--line: #2a2c32;--line-strong: #474a52;--text: #e9e9ee;--text-sub: #c4c5cc;--text-muted: #a0a2aa;--accent: #f7f7fa;--on-accent: #0f1013;--font-body: "Zen Kaku Gothic New", "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic", Meiryo, sans-serif;--font-display: "Space Grotesk", var(--font-body);--radius: 16px;--radius-lg: 20px}html{scroll-behavior:smooth;scroll-padding-top:84px}@media(max-width:560px){html{scroll-padding-top:116px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}body{margin:0;background-color:var(--bg);color:var(--text);font-family:var(--font-body);font-size:16px;line-height:1.8;-webkit-text-size-adjust:100%}a{color:var(--text);text-underline-offset:3px}a:hover{color:var(--accent)}:focus-visible{outline:2px solid var(--accent);outline-offset:3px}img{max-width:100%}.site{min-height:100vh;display:flex;flex-direction:column}.site>main{flex:1}.site-header{position:sticky;top:0;z-index:10;background-color:#0f1013eb;backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}.site-header__inner{min-height:68px;display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:0 24px}.site-header__nav{display:flex;flex-wrap:wrap;align-items:center;margin-left:auto}.site-header__nav a{text-decoration:none;padding:10px 14px;font-size:14px;font-weight:500}.lang-switch{display:flex;align-items:center;margin-right:-8px;padding-left:8px;border-left:1px solid var(--line);font-family:var(--font-display)}.lang-switch a{text-decoration:none;padding:10px 8px;font-size:13px;font-weight:700;letter-spacing:.08em;color:var(--text-muted)}.lang-switch a[aria-current=true]{color:var(--accent)}.logo{display:flex;align-items:baseline;gap:10px;text-decoration:none;color:var(--text)}.logo:hover{color:var(--text)}.logo__mark{display:block;height:28px;width:auto;color:var(--accent)}.logo__sub{font-size:13px;color:var(--text-muted)}.site-footer{border-top:1px solid var(--line)}.site-footer__inner{padding-top:32px;padding-bottom:40px;display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px 24px;font-size:13px;color:var(--text-muted)}.site-footer .logo__mark{height:20px}.site-footer__nav{display:flex;flex-wrap:wrap;margin:0 -12px}.site-footer__nav a{display:inline-flex;align-items:center;min-height:44px;padding:0 12px;color:var(--text-sub)}@media(max-width:560px){.site-header__inner{padding-top:10px}.site-header__nav{order:1;width:100%;margin-left:-8px}.site-header__nav a{padding:10px 8px;font-size:13px}.lang-switch{margin-left:auto;border-left:0}}.wrap{width:100%;max-width:1240px;margin:0 auto;box-sizing:border-box;padding-left:24px;padding-right:24px}@media(max-width:560px){.wrap{padding-left:16px;padding-right:16px}}.section{padding-top:72px}@media(max-width:560px){.section{padding-top:56px}}.eyebrow{display:block;font-family:var(--font-display);font-size:13px;font-weight:700;letter-spacing:.2em;line-height:1.6;color:var(--accent)}.heading{margin:4px 0 24px;font-size:30px;font-weight:900;line-height:1.3}.muted{color:var(--text-muted)}.sub{color:var(--text-sub)}.tag{display:inline-block;font-size:12px;font-weight:700;line-height:1.6;padding:2px 10px;border-radius:4px;border:1px solid var(--line-strong);color:var(--text-sub)}.tag--accent{font-family:var(--font-display);letter-spacing:.14em;border-color:var(--accent);background-color:var(--accent);color:var(--on-accent)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:52px;box-sizing:border-box;padding:0 26px;border-radius:999px;border:1px solid var(--accent);background-color:var(--accent);color:var(--on-accent);font:inherit;font-weight:700;text-decoration:none;cursor:pointer}.btn:hover{color:var(--on-accent);background-color:#fff}.btn--ghost{border-color:var(--line-strong);background-color:transparent;color:var(--text);font-weight:500}.btn--ghost:hover{color:var(--accent);border-color:var(--accent);background-color:#ffffff0f}.btn-row{display:flex;flex-wrap:wrap;gap:12px}.panel{background-color:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg)}.icon{flex-shrink:0}.notice{display:flex;align-items:flex-start;gap:8px;margin:0;font-size:13px;line-height:1.6;color:var(--text-sub)}.notice .icon{margin-top:2px}.page{padding-bottom:88px}.page__title{margin:4px 0 24px;font-size:clamp(28px,5vw,36px);font-weight:900;line-height:1.3}.prose{max-width:44em}.prose h2{margin:40px 0 8px;font-size:20px;font-weight:700;line-height:1.5}.prose p{margin:0 0 12px;color:var(--text-sub)}