:root{--color-bg: #faf8f5;--color-bg-secondary: #ffffff;--color-bg-card: #ffffff;--color-bg-card-hover: #fef7ed;--color-bg-input: #ffffff;--color-text: #2d3748;--color-text-secondary: #5a6577;--color-text-muted: #94a0b4;--color-primary: #f97316;--color-primary-hover: #ea580c;--color-primary-bg: rgba(249, 115, 22, .08);--color-accent: #8b5cf6;--color-border: #e8e2d9;--color-border-light: #d4cdc3;--color-success: #16a34a;--color-warning: #d97706;--color-error: #dc2626;--radius-sm: 6px;--radius-md: 10px;--radius-lg: 16px;--radius-xl: 24px;--shadow-sm: 0 1px 3px rgba(0, 0, 0, .06);--shadow-md: 0 4px 12px rgba(0, 0, 0, .08);--shadow-lg: 0 8px 24px rgba(0, 0, 0, .1);--font-sans: "Hiragino Kaku Gothic ProN", "Noto Sans JP", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--font-mono: "SF Mono", "Fira Code", "Fira Mono", monospace;--container-max: 1100px;--header-height: 60px}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;-webkit-text-size-adjust:100%}body{font-family:var(--font-sans);background-color:var(--color-bg);color:var(--color-text);line-height:1.7;min-height:100vh}#root{min-height:100vh;display:flex;flex-direction:column}a{color:var(--color-primary);text-decoration:none;transition:color .2s}a:hover{color:var(--color-primary-hover)}img{max-width:100%;height:auto}input,select,button,textarea{font-family:inherit;font-size:inherit}input[type=number],input[type=text],select{background-color:var(--color-bg-input);border:1px solid var(--color-border);border-radius:var(--radius-sm);color:var(--color-text);padding:.6rem .8rem;transition:border-color .2s;width:100%}input[type=number]:focus,input[type=text]:focus,select:focus{outline:none;border-color:var(--color-primary)}input[type=number]::-webkit-inner-spin-button{opacity:1}.container{max-width:var(--container-max);margin:0 auto;padding:0 1rem;width:100%}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border-width:0}.site-header{height:var(--header-height);border-bottom:1px solid var(--color-border);background-color:var(--color-bg-secondary);box-shadow:var(--shadow-sm);position:sticky;top:0;z-index:100}.site-header .container{display:flex;align-items:center;justify-content:space-between;height:100%}.site-header__logo{font-size:1.15rem;font-weight:700;color:var(--color-text);display:flex;align-items:center;gap:.5rem}.site-header__logo:hover{color:var(--color-primary)}.site-header__nav{display:flex;gap:1.5rem;align-items:center}.site-header__nav a{color:var(--color-text-secondary);font-size:.9rem;transition:color .2s}.site-header__nav a:hover{color:var(--color-text)}.site-footer{border-top:1px solid var(--color-border);background-color:var(--color-bg-secondary);padding:2rem 0;margin-top:auto}.site-footer__inner{display:flex;flex-direction:column;align-items:center;gap:1rem}.site-footer__links{display:flex;gap:1.5rem;flex-wrap:wrap;justify-content:center}.site-footer__links a{color:var(--color-text-secondary);font-size:.85rem}.site-footer__copy{color:var(--color-text-muted);font-size:.8rem}main{flex:1;padding:2rem 0}.section-header{margin-bottom:2rem}.section-header__title{font-size:1.6rem;font-weight:700;margin-bottom:.5rem;line-height:1.3}.section-header__desc{color:var(--color-text-secondary);font-size:.95rem}.card{background-color:var(--color-bg-card);border:1px solid var(--color-border);border-radius:var(--radius-lg);padding:1.5rem;box-shadow:var(--shadow-sm);transition:background-color .2s,border-color .2s,transform .2s,box-shadow .2s}.card--hover:hover{background-color:var(--color-bg-card-hover);border-color:var(--color-border-light);box-shadow:var(--shadow-md);transform:translateY(-2px)}.card--hover{cursor:pointer}.btn{display:inline-flex;align-items:center;justify-content:center;gap:.4rem;padding:.6rem 1.4rem;border-radius:var(--radius-md);font-weight:600;font-size:.9rem;border:none;cursor:pointer;transition:background-color .2s,transform .1s;line-height:1.4}.btn:active{transform:scale(.97)}.btn--primary{background-color:var(--color-primary);color:#fff}.btn--primary:hover{background-color:var(--color-primary-hover)}.btn--secondary{background-color:var(--color-bg-card);color:var(--color-text);border:1px solid var(--color-border)}.btn--secondary:hover{background-color:var(--color-bg-card-hover);border-color:var(--color-border-light)}.btn--danger{background-color:var(--color-error);color:#fff}.btn--danger:hover{background-color:#ef4444}.btn--large{padding:.8rem 2rem;font-size:1rem}.btn--small{padding:.4rem .8rem;font-size:.8rem}.tool-card{display:block;text-decoration:none;color:inherit}.tool-card__icon{font-size:2rem;margin-bottom:.75rem}.tool-card__name{font-size:1.1rem;font-weight:600;margin-bottom:.4rem;color:var(--color-text)}.tool-card__desc{color:var(--color-text-secondary);font-size:.85rem;line-height:1.5}.tool-card__category{display:inline-block;margin-top:.75rem;font-size:.75rem;color:var(--color-primary);background-color:var(--color-primary-bg);padding:.2rem .6rem;border-radius:var(--radius-sm)}.tools-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:1.25rem}.category-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:1rem}.category-card{display:flex;align-items:center;gap:1rem;text-decoration:none;color:inherit}.category-card__icon{font-size:2rem;flex-shrink:0}.category-card__info h3{font-size:1rem;font-weight:600;color:var(--color-text);margin-bottom:.2rem}.category-card__info p{font-size:.8rem;color:var(--color-text-secondary)}.breadcrumbs{display:flex;align-items:center;gap:.4rem;font-size:.85rem;color:var(--color-text-muted);margin-bottom:1.5rem;flex-wrap:wrap}.breadcrumbs a{color:var(--color-text-secondary)}.breadcrumbs__separator{color:var(--color-text-muted)}.breadcrumbs__current{color:var(--color-text)}.hero{text-align:center;padding:3rem 0 2rem}.hero__title{font-size:2rem;font-weight:800;margin-bottom:.75rem;background:linear-gradient(135deg,#ea580c,#f97316,#8b5cf6);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.hero__subtitle{color:var(--color-text-secondary);font-size:1.05rem;max-width:600px;margin:0 auto}.tool-detail{max-width:800px;margin:0 auto}.tool-detail__header{margin-bottom:2rem}.tool-detail__icon{font-size:2.5rem;margin-bottom:.75rem}.tool-detail__title{font-size:1.8rem;font-weight:700;margin-bottom:.5rem}.tool-detail__desc{color:var(--color-text-secondary);font-size:.95rem;line-height:1.7}.tool-detail__body{margin-bottom:3rem}.faq-section{margin-top:3rem}.faq-item{border-bottom:1px solid var(--color-border);padding:1.2rem 0}.faq-item:first-child{border-top:1px solid var(--color-border)}.faq-item__question{font-weight:600;font-size:.95rem;margin-bottom:.5rem;color:var(--color-text)}.faq-item__answer{color:var(--color-text-secondary);font-size:.9rem;line-height:1.6}.howto-section{margin-top:2.5rem}.howto-steps{list-style:none;counter-reset:step}.howto-step{counter-increment:step;display:flex;gap:1rem;padding:1rem 0;border-bottom:1px solid var(--color-border)}.howto-step:before{content:counter(step);display:flex;align-items:center;justify-content:center;width:32px;height:32px;border-radius:50%;background-color:var(--color-primary-bg);color:var(--color-primary);font-weight:700;font-size:.9rem;flex-shrink:0}.howto-step__content h4{font-size:.95rem;font-weight:600;margin-bottom:.2rem}.howto-step__content p{color:var(--color-text-secondary);font-size:.85rem}.related-tools{margin-top:3rem}.tool-widget{padding:1.5rem;background-color:var(--color-bg-card);border:1px solid var(--color-border);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm)}.tool-widget__row{display:flex;gap:1rem;align-items:flex-end;margin-bottom:1rem;flex-wrap:wrap}.tool-widget__field{display:flex;flex-direction:column;gap:.3rem;flex:1;min-width:120px}.tool-widget__label{font-size:.8rem;color:var(--color-text-secondary);font-weight:500}.tool-widget__actions{display:flex;gap:.5rem;margin-top:1rem;flex-wrap:wrap}.tool-widget__result{margin-top:1.5rem;padding:1.2rem;background-color:var(--color-primary-bg);border-radius:var(--radius-md);border:1px solid var(--color-border)}.tool-widget__result-label{font-size:.8rem;color:var(--color-text-secondary);margin-bottom:.3rem}.tool-widget__result-value{font-size:1.8rem;font-weight:700;font-family:var(--font-mono);color:var(--color-primary)}.timer-display{font-size:4rem;font-weight:700;font-family:var(--font-mono);text-align:center;padding:2rem 0;color:var(--color-text);letter-spacing:.05em}.timer-display--running{color:var(--color-success)}.timer-display--finished{color:var(--color-error);animation:blink 1s step-end infinite}@keyframes blink{50%{opacity:.3}}.tabs{display:flex;gap:.25rem;margin-bottom:1.5rem;border-bottom:1px solid var(--color-border);overflow-x:auto}.tab{padding:.6rem 1rem;border:none;background:none;color:var(--color-text-secondary);font-size:.9rem;font-weight:500;cursor:pointer;border-bottom:2px solid transparent;white-space:nowrap;transition:color .2s,border-color .2s}.tab:hover{color:var(--color-text)}.tab--active{color:var(--color-primary);border-bottom-color:var(--color-primary)}.swap-btn{display:flex;align-items:center;justify-content:center;width:36px;height:36px;border-radius:50%;border:1px solid var(--color-border);background:var(--color-bg-card);color:var(--color-text-secondary);cursor:pointer;font-size:1.1rem;transition:background-color .2s,color .2s;flex-shrink:0;align-self:center}.swap-btn:hover{background-color:var(--color-bg-card-hover);color:var(--color-text)}.static-page{max-width:700px;margin:0 auto}.static-page h1{font-size:1.6rem;font-weight:700;margin-bottom:1.5rem}.static-page h2{font-size:1.2rem;font-weight:600;margin-top:2rem;margin-bottom:.75rem}.static-page p{color:var(--color-text-secondary);margin-bottom:1rem;line-height:1.8}.static-page ul{color:var(--color-text-secondary);padding-left:1.5rem;margin-bottom:1rem}.static-page li{margin-bottom:.5rem}.not-found{text-align:center;padding:4rem 0}.not-found__code{font-size:5rem;font-weight:800;color:var(--color-text-muted);line-height:1}.not-found__title{font-size:1.5rem;margin:1rem 0}.not-found__desc{color:var(--color-text-secondary);margin-bottom:2rem}.loading{display:flex;align-items:center;justify-content:center;padding:3rem;color:var(--color-text-secondary)}@media(max-width:768px){.hero__title{font-size:1.5rem}.hero__subtitle{font-size:.95rem}.section-header__title{font-size:1.3rem}.tools-grid{grid-template-columns:1fr}.timer-display{font-size:2.8rem}.tool-widget__row{flex-direction:column;align-items:stretch}.tool-widget__result-value{font-size:1.4rem}.site-header__nav{gap:1rem}}