:root{--background: #fcf9f8;--surface: #ffffff;--surface-low: #f6f3f2;--surface-high: #ebe7e7;--surface-variant: #e5e2e1;--text: #1c1b1b;--muted: #434656;--outline: #c3c5d9;--primary: #0041c8;--primary-strong: #0055ff;--primary-soft: #dce1ff;--shadow: 0 20px 40px rgba(28, 27, 27, .04), 0 5px 10px rgba(28, 27, 27, .02);--radius-sm: .25rem;--radius-md: .75rem;--radius-lg: 1.5rem;--max-width: 1200px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Inter,Noto Sans JP,sans-serif;color:var(--text);background:radial-gradient(circle at top right,rgba(0,85,255,.12),transparent 28%),linear-gradient(180deg,#ffffff 0%,var(--background) 20%,var(--background) 100%)}img{display:block;max-width:100%}a{color:inherit;text-decoration:none}button,input,textarea{font:inherit}.page-shell{min-height:100vh}.topbar{position:sticky;top:0;z-index:50;-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);background:#ffffffb8;border-bottom:1px solid 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