:root{--color-primary:#0c447c;--color-secondary:#185fa5;--color-accent:#378add;--color-dark-bg:#0a1628;--color-light-bg:#fff;--color-card-bg:#fff;--color-card-hover:#f8fafc;--color-success:#10b981;--color-warning:#f59e0b;--color-error:#ef4444;--color-text-primary:#1a1a2e;--color-text-secondary:#6b7280;--color-text-on-dark:#e5e7eb;--color-border:#e5e7eb;--font-ja:"Noto Sans JP", sans-serif;--font-en:"Inter", Arial, sans-serif;--font-code:"JetBrains Mono", "Fira Code", monospace;--space-xs:4px;--space-sm:8px;--space-md:16px;--space-lg:24px;--space-xl:32px;--space-2xl:48px;--space-3xl:64px;--radius-sm:6px;--radius-md:10px;--radius-lg:16px;--radius-full:9999px;--shadow-sm:0 1px 3px #00000014;--shadow-md:0 4px 12px #0000001a;--shadow-lg:0 8px 30px #0000001f;--transition-fast:.15s ease;--transition-base:.2s ease;--transition-slow:.3s ease}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{font-family:var(--font-ja);color:var(--color-text-primary);background-color:var(--color-light-bg);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;line-height:1.8}h1,h2,h3,h4,h5,h6{font-family:var(--font-en);color:var(--color-text-primary);font-weight:600;line-height:1.3}h1{font-size:2.25rem}h2{font-size:1.75rem}h3{font-size:1.375rem}h4{font-size:1.125rem}a{color:var(--color-accent);transition:color var(--transition-base);text-decoration:none}a:hover{color:var(--color-secondary)}img{max-width:100%;height:auto;display:block}button{cursor:pointer;background:0 0;border:none;font-family:inherit}input,textarea,select{font-family:inherit;font-size:inherit}.container{width:100%;max-width:1200px;padding-left:var(--space-lg);padding-right:var(--space-lg);margin-left:auto;margin-right:auto}.section{padding-top:var(--space-2xl);padding-bottom:var(--space-2xl)}.section-lg{padding-top:var(--space-3xl);padding-bottom:var(--space-3xl)}.dark-section{background-color:var(--color-dark-bg);color:var(--color-text-on-dark)}.dark-section h1,.dark-section h2,.dark-section h3,.dark-section h4{color:#fff}.card{background-color:var(--color-card-bg);border:1px solid var(--color-border);border-radius:var(--radius-md);box-shadow:var(--shadow-sm);transition:box-shadow var(--transition-base), transform var(--transition-base);cursor:pointer}.card:hover{box-shadow:var(--shadow-md);transform:translateY(-2px)}@media (prefers-reduced-motion:reduce){*,:before,:after{scroll-behavior:auto!important;transition-duration:.01ms!important;animation-duration:.01ms!important;animation-iteration-count:1!important}}:focus-visible{outline:2px solid var(--color-accent);outline-offset:2px}.sr-only{clip:rect(0, 0, 0, 0);white-space:nowrap;border-width:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}@media (max-width:768px){h1{font-size:1.75rem}h2{font-size:1.5rem}h3{font-size:1.25rem}.container{padding-left:var(--space-md);padding-right:var(--space-md)}.section{padding-top:var(--space-xl);padding-bottom:var(--space-xl)}}