:root{--font-sans:"Segoe UI Variable Text", "Segoe UI", "BIZ UDGothic", "BIZ UDゴシック", "Meiryo UI", Meiryo, system-ui, -apple-system, sans-serif;--font-title:"Segoe UI Variable Display", "Segoe UI", "BIZ UDGothic", "BIZ UDゴシック", "Meiryo UI", Meiryo, system-ui, sans-serif;--color-bg-primary:#fff;--color-bg-secondary:#f9fafb;--color-bg-tertiary:#f3f4f6;--color-bg-dark:#111827;--color-bg-dark-light:#1f2937;--color-text-primary:#111827;--color-text-secondary:#4b5563;--color-text-muted:#9ca3af;--color-text-dark-bg:#f9fafb;--color-text-dark-bg-sub:#d1d5db;--color-brand-primary:#06c;--color-brand-hover:#0052a3;--color-brand-light:#e0f2fe;--color-accent-orange:#f97316;--color-accent-orange-hover:#ea580c;--color-border-light:#e5e7eb;--color-border-medium:#d1d5db;--color-border-dark:#374151;--shadow-sm:0 1px 2px 0 #0000000d;--shadow-md:0 4px 6px -1px #0000000d, 0 2px 4px -1px #00000008;--shadow-lg:0 10px 15px -3px #00000008, 0 4px 6px -2px #00000005;--shadow-inner:inset 0 2px 4px 0 #0000000f;--transition-fast:.15s ease;--transition-normal:.25s cubic-bezier(.4, 0, .2, 1)}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;font-size:16px}body{font-family:var(--font-sans);color:var(--color-text-primary);background-color:var(--color-bg-primary);text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-weight:400;line-height:1.625}html[lang=ja] .lang-en,html[lang=en] .lang-ja{display:none!important}h1,h2,h3,h4,h5,h6{font-family:var(--font-title);color:var(--color-text-primary);letter-spacing:-.02em;font-weight:700;line-height:1.2}p{margin-bottom:1rem}a{color:var(--color-brand-primary);transition:color 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#22c55e33}.step-list{flex-direction:column;gap:2rem;margin-top:2.5rem;display:flex}.step-item{align-items:flex-start;gap:1.5rem;display:flex}.step-number{font-family:var(--font-title);color:var(--color-brand-primary);background-color:var(--color-brand-light);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:3.5rem;height:3.5rem;font-size:1.75rem;font-weight:800;display:flex}.step-body{flex-direction:column;gap:.35rem;display:flex}.step-title{font-size:1.1rem;font-weight:700}.step-desc{color:var(--color-text-secondary);font-size:.9rem;line-height:1.6}