:root{--color-bg:#f5f5f7;--color-bg-alt:#eaebee;--color-surface:#ffffff;--color-text:#232f3e;--color-text-muted:#545b64;--color-text-light:#879596;--color-accent:#ff9900;--color-accent-hover:#ec7211;--color-mint:#d5e8d4;--color-mint-light:#e8f4e8;--color-coral:#ffb74d;--color-coral-light:#fff3e0;--color-sand:#eaeded;--color-sand-light:#fafafa;--color-border:#d5dbdb;--color-selection-bg:#ff9900;--color-selection-fg:#ffffff;--color-focus:#0073bb;--color-link:#0073bb;--color-link-hover:#005276;--color-header-bg:#232f3e;--color-header-text:#ffffff;--color-header-link-hover:#ff9900;--color-header-border:#37475a;--color-footer-bg:#232f3e;--color-footer-text:rgba(255,255,255,0.85);--color-footer-border:#37475a;--color-hero-bg-start:#232f3e;--color-hero-bg-end:#37475a;--color-hero-text:#ffffff;--color-blue-light:#e8f4fd;--text-xs:0.75rem;--text-sm:0.875rem;--text-base:1rem;--text-lg:1.125rem;--text-xl:1.25rem;--text-2xl:1.5rem;--text-3xl:1.875rem;--text-4xl:2.25rem;--text-5xl:3rem;--leading-tight:1.3;--leading-normal:1.8;--leading-loose:2.0;--space-xs:0.25rem;--space-sm:0.5rem;--space-md:1rem;--space-lg:1.5rem;--space-xl:2rem;--space-2xl:3rem;--space-3xl:4rem;--space-4xl:6rem;--radius-sm:4px;--radius-md:6px;--radius-lg:8px;--shadow-sm:0 1px 2px rgba(0,0,0,0.04);--shadow-md:0 2px 8px rgba(0,0,0,0.06);--shadow-lg:0 4px 16px rgba(0,0,0,0.08);}*,*::before,*::after{box-sizing:border-box;margin:0;padding:0;}html{font-size:100%;-webkit-text-size-adjust:100%;}body{font-family:"Hiragino Kaku Gothic ProN","Hiragino Sans",system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;font-size:var(--text-base);line-height:var(--leading-normal);color:var(--color-text);background-color:var(--color-bg);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;}h1,h2,h3,h4,h5,h6{line-height:var(--leading-tight);letter-spacing:-0.01em;color:var(--color-text);}h1{font-size:var(--text-4xl);font-weight:700;letter-spacing:-0.02em;}h2{font-size:var(--text-2xl);font-weight:700;}h3{font-size:var(--text-xl);font-weight:600;}h4{font-size:var(--text-lg);font-weight:600;}h5{font-size:var(--text-base);font-weight:600;}h6{font-size:var(--text-sm);font-weight:600;}::selection{background-color:var(--color-selection-bg);color:var(--color-selection-fg);}::-webkit-scrollbar{width:8px;height:8px;}::-webkit-scrollbar-track{background:var(--color-bg-alt);}::-webkit-scrollbar-thumb{background:var(--color-sand);border-radius:4px;}::-webkit-scrollbar-thumb:hover{background:var(--color-text-light);}a{color:var(--color-link);text-decoration:none;transition:color 0.2s ease;}a:hover{color:var(--color-link-hover);}ul,ol{list-style:none;}img{max-width:100%;height:auto;display:block;}