:root{--bg: #f6f7f4;--surface: #ffffff;--surface-muted: #eef2ec;--text: #15201b;--muted: #637169;--line: #dce3dd;--primary: #136f63;--primary-strong: #0d4e46;--accent: #2f6fbb;--warn: #916600;--danger: #a13b2e;--shadow: 0 10px 30px rgba(18, 33, 26, .08);color-scheme:light;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Noto Sans JP,Hiragino Kaku Gothic ProN,Yu Gothic,Meiryo,sans-serif}*{box-sizing:border-box}html{background:var(--bg);color:var(--text);scroll-behavior:smooth}body{margin:0;min-width:320px;font-size:16px;line-height:1.65}body,button,input,select{font:inherit}a{color:inherit;text-decoration:none}a:hover{color:var(--primary)}button,select,input{border:0}button{cursor:pointer}img,svg{display:block}.site-shell{min-height:100vh}.site-header{background:#f6f7f4eb;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20;backdrop-filter:blur(16px)}.nav{align-items:center;display:flex;flex-wrap:wrap;gap:24px;justify-content:space-between;margin:0 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