:root{--color-primary:#dde7ef;--color-primary-dark:#fff;--color-accent:#27b4c4;--color-accent-light:#103a40;--color-white:#181e21;--color-background:#14191c;--color-border:#344046;--color-text:#e8e4de;--color-text-sub:#b8bcba;--color-text-muted:#818886;--color-success:#58a984;--color-warning:#c29443;--color-danger:#d06c6c;--color-info:#69a6d5;--color-surface:#181e21;--color-surface-elevated:#21292e;--color-header:#151a1d;--color-footer:#0e2238;--color-accent-surface:#103a40;--font-sans:"Noto Sans JP", Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--container-width:1200px;--content-width:760px;--space-1:4px;--space-2:8px;--space-3:12px;--space-4:16px;--space-5:24px;--space-6:32px;--space-7:48px;--space-8:64px;--space-9:80px;--radius-button:8px;--radius-card:12px;--shadow-soft:0 8px 24px #0000002e}*,:before,:after{box-sizing:border-box}html{color-scheme:dark;scroll-behavior:smooth}body{min-width:320px;min-height:100vh;font-family:var(--font-sans);color:var(--color-text);background:var(--color-background);text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;flex-direction:column;margin:0;font-size:16px;line-height:1.75;display:flex}img{max-width:100%;height:auto;display:block}button,input,textarea,select{font:inherit}a{color:var(--color-accent);text-underline-offset:.18em;text-decoration-thickness:.08em}a:hover{color:var(--color-primary-dark)}#main-content{flex:1}.skip-link{top:var(--space-3);left:var(--space-3);z-index:1000;min-height:44px;padding:var(--space-3) var(--space-4);border-radius:var(--radius-button);background:var(--color-accent);color:var(--color-primary-dark);align-items:center;text-decoration:none;display:inline-flex;position:absolute;transform:translateY(-200%)}.skip-link:focus-visible{transform:translateY(0)}:focus-visible{outline:3px solid var(--color-accent);outline-offset:3px}h1,h2,h3{color:var(--color-primary);margin:0;line-height:1.2}h1{font-size:clamp(2rem,6vw,3rem)}h2{font-size:clamp(1.75rem,4vw,2.125rem)}h3{font-size:clamp(1.375rem,3vw,1.625rem)}p{margin:0 0 var(--space-4)}.container{width:min(100% - 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