:root{--color-primary:#5b5fc7;--color-primary-light:#e8e9f8;--color-surface:#fff;--color-background:#f5f5f7;--color-border:#e0e0e0;--color-text:#1a1a1a;--color-text-secondary:#666;--color-text-tertiary:#999;--color-success:#22c55e;--color-error:#ef4444;--color-warning:#f59e0b;--radius:8px;--radius-lg:12px;--shadow-sm:0 1px 3px #00000014;--shadow-md:0 4px 12px #0000001a;--max-width:960px;--wcag-pass-bg:#dcfce7;--wcag-pass-border:#86efac;--wcag-pass-text:#16a34a;--wcag-fail-bg:#fef2f2;--wcag-fail-border:#fca5a5;--wcag-fail-text:#dc2626}@media (prefers-color-scheme:dark){:root{--color-primary:#8b8fe8;--color-primary-light:#2a2b4a;--color-surface:#1e1e2e;--color-background:#14141e;--color-border:#3a3a4a;--color-text:#e4e4e8;--color-text-secondary:#a0a0b0;--color-text-tertiary:#707080;--color-success:#4ade80;--color-error:#f87171;--color-warning:#fbbf24;--shadow-sm:0 1px 3px #0000004d;--shadow-md:0 4px 12px #0006;--wcag-pass-bg:#14532d;--wcag-pass-border:#166534;--wcag-pass-text:#4ade80;--wcag-fail-bg:#450a0a;--wcag-fail-border:#7f1d1d;--wcag-fail-text:#f87171}}*,:before,:after{box-sizing:border-box;margin:0;padding:0}body{background:var(--color-background);color:var(--color-text);-webkit-font-smoothing:antialiased;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Hiragino Sans,Noto Sans JP,sans-serif;line-height:1.6}a{color:var(--color-primary);text-decoration:none}a:hover{text-decoration:underline}.container{max-width:var(--max-width);margin:0 auto;padding:0 16px}.site-header{background:var(--color-surface);border-bottom:1px solid var(--color-border);z-index:10;padding:12px 0;position:sticky;top:0}.site-header .container{align-items:center;gap:24px;display:flex}.lang-switch{color:var(--color-primary);background:var(--color-primary-light);border-radius:var(--radius);white-space:nowrap;margin-left:auto;padding:4px 10px;font-size:.75rem;font-weight:700;text-decoration:none;transition:background-color .15s}.lang-switch:hover{background:var(--color-primary);color:#fff;text-decoration:none}.site-header__title{white-space:nowrap;font-size:1.1rem;font-weight:700}.site-header__title a{color:var(--color-text);text-decoration:none}.site-nav{scrollbar-width:none;gap:4px;display:flex;overflow-x:auto}.site-nav::-webkit-scrollbar{display:none}.site-nav a{color:var(--color-text-secondary);border-radius:var(--radius);white-space:nowrap;padding:6px 12px;font-size:.875rem;font-weight:500;text-decoration:none;transition:background-color .2s,color .2s}.site-nav a:hover{background:var(--color-primary-light);color:var(--color-primary);text-decoration:none}.site-nav a.active{background:var(--color-primary-light);color:var(--color-primary)}.main{min-height:calc(100vh - 200px);padding:32px 0}.site-footer{background:var(--color-surface);border-top:1px solid var(--color-border);text-align:center;color:var(--color-text-secondary);margin-top:48px;padding:24px 0;font-size:.85rem}.card{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);padding:24px}.card+.card{margin-top:16px}.color-preview{border-radius:var(--radius);border:1px solid var(--color-border)}.color-preview--sm{width:32px;height:32px}.color-preview--md{width:80px;height:80px}.color-preview--lg{width:100%;height:120px}.copy-btn{color:var(--color-text-secondary);background:var(--color-background);border:1px solid var(--color-border);border-radius:var(--radius);cursor:pointer;white-space:nowrap;justify-content:center;align-items:center;padding:4px 10px;font-size:.75rem;font-weight:500;transition:all .15s;display:inline-flex}.copy-btn:hover{background:var(--color-primary-light);color:var(--color-primary);border-color:var(--color-primary)}.copy-btn--copied{background:var(--color-success);color:#fff;border-color:var(--color-success)}.form-group{flex-direction:column;gap:6px;display:flex}.form-group label{color:var(--color-text-secondary);font-size:.8125rem;font-weight:600}.form-group input{border:1px solid var(--color-border);border-radius:var(--radius);padding:8px 12px;font-family:SF Mono,Fira Code,monospace;font-size:.9375rem;transition:border-color .15s}.form-group input:focus{border-color:var(--color-primary);box-shadow:0 0 0 3px var(--color-primary-light);outline:none}.page-title{margin-bottom:8px;font-size:1.5rem;font-weight:700}.page-description{color:var(--color-text-secondary);margin-bottom:24px}.loading{min-height:200px;color:var(--color-text-tertiary);justify-content:center;align-items:center;display:flex}.converter-preview{align-items:stretch;gap:16px;margin-bottom:16px;display:flex}.converter-preview__picker{flex-shrink:0}.converter-picker-input{border:1px solid var(--color-border);border-radius:var(--radius);cursor:pointer;background:0 0;width:60px;height:100%;min-height:80px;padding:2px}.converter-preview .color-preview--lg{flex:1}.converter-form{flex-direction:column;gap:12px;display:flex}.color-field{grid-template-columns:56px 1fr auto;align-items:center;gap:8px;display:grid}.color-field__label{color:var(--color-text-secondary);text-transform:uppercase;letter-spacing:.02em;font-size:.8125rem;font-weight:700}.color-field__input{border:1px solid var(--color-border);border-radius:var(--radius);min-width:0;padding:8px 12px;font-family:SF Mono,Fira Code,monospace;font-size:.9375rem;transition:border-color .15s}.color-field__input:focus{border-color:var(--color-primary);box-shadow:0 0 0 3px var(--color-primary-light);outline:none}.color-field__input--invalid{border-color:var(--color-error)}.color-field__input--invalid:focus{border-color:var(--color-error);box-shadow:0 0 0 3px #ef444426}.color-field__actions{gap:4px;display:flex}.converter-links{flex-wrap:wrap;align-items:center;gap:12px;margin-top:16px;display:flex}.converter-links__label{color:var(--color-text-secondary);font-size:.875rem;font-weight:500}.converter-links__items{flex-wrap:wrap;gap:8px;display:flex}.converter-links__items a{background:var(--color-primary-light);color:var(--color-primary);border-radius:var(--radius);padding:6px 14px;font-size:.8125rem;font-weight:500;text-decoration:none;transition:background-color .15s;display:inline-block}.converter-links__items a:hover{background:var(--color-primary);color:#fff;text-decoration:none}.palette-base{margin-bottom:16px}.palette-base__inputs{align-items:center;gap:8px;margin-top:8px;display:flex}.palette-base__picker{width:48px;height:40px;min-height:auto}.palette-tabs{scrollbar-width:none;gap:4px;margin-bottom:16px;display:flex;overflow-x:auto}.palette-tabs::-webkit-scrollbar{display:none}.palette-tab{border:1px solid var(--color-border);border-radius:var(--radius);background:var(--color-surface);color:var(--color-text-secondary);cursor:pointer;white-space:nowrap;padding:8px 16px;font-size:.8125rem;font-weight:500;transition:all .15s}.palette-tab:hover{background:var(--color-primary-light);color:var(--color-primary);border-color:var(--color-primary)}.palette-tab--active{background:var(--color-primary);color:#fff;border-color:var(--color-primary)}.palette-strip{border-radius:var(--radius);height:80px;margin-bottom:16px;display:flex;overflow:hidden}.palette-strip__color{flex:1}.palette-colors{flex-direction:column;gap:8px;margin-bottom:16px;display:flex}.palette-color-item{border-radius:var(--radius);background:var(--color-background);align-items:center;gap:12px;padding:8px;display:flex}.palette-color-item__info{flex-wrap:wrap;flex:1;align-items:baseline;gap:4px 12px;display:flex}.palette-color-item__label{color:var(--color-text);font-size:.8125rem;font-weight:600}.palette-color-item__hex{color:var(--color-text-secondary);font-family:SF Mono,Fira Code,monospace;font-size:.8125rem}.palette-color-item__rgb{color:var(--color-text-tertiary);font-size:.75rem}.palette-css{text-align:right}.gradient-inputs{flex-wrap:wrap;align-items:center;gap:12px;margin-bottom:16px;display:flex}.gradient-color-row{flex:1;align-items:center;gap:8px;min-width:200px;display:flex}.gradient-swap-btn{border:1px solid var(--color-border);border-radius:var(--radius);background:var(--color-surface);cursor:pointer;flex-shrink:0;justify-content:center;align-items:center;width:36px;height:36px;font-size:1.1rem;transition:all .15s;display:flex}.gradient-swap-btn:hover{background:var(--color-primary-light);border-color:var(--color-primary)}.gradient-settings{flex-direction:column;gap:16px;margin-bottom:16px;display:flex}.gradient-setting{flex-direction:column;gap:8px;display:flex}.gradient-direction-btns{flex-wrap:wrap;gap:4px;display:flex}.gradient-range{width:100%;accent-color:var(--color-primary)}.gradient-preview{border-radius:var(--radius);border:1px solid 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.wcag-badge__status{color:var(--wcag-fail-text)}.wcag-badge__label{color:var(--color-text);flex:1;font-weight:500}.wcag-badge__req{color:var(--color-text-tertiary);font-size:.75rem}.contrast-preview{border-radius:var(--radius-lg);border:1px solid var(--color-border);margin-top:16px;padding:24px}.contrast-preview__text-normal{margin-bottom:12px;font-size:16px}.contrast-preview__text-large{margin-bottom:12px;font-size:24px;font-weight:700}.contrast-preview__text-small{font-size:12px}.contrast-suggestion{margin-top:16px}.contrast-suggestion__label{color:var(--color-text-secondary);margin-bottom:8px;font-size:.875rem;font-weight:500}.contrast-suggestion__color{flex-wrap:wrap;align-items:center;gap:8px;display:flex}.contrast-suggestion__ratio{color:#16a34a;font-size:.8125rem;font-weight:600}.seo-content{color:var(--color-text-secondary);margin-top:48px;font-size:.875rem;line-height:1.8}.seo-content h2{color:var(--color-text);margin-top:24px;margin-bottom:8px;font-size:1.1rem}.seo-content ul{padding-left:20px}.seo-content li{margin-bottom:4px}@media (width<=640px){.site-header .container{flex-direction:column;align-items:flex-start;gap:8px}.page-title{font-size:1.25rem}}