*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;overflow-x:hidden}body{font-family:'Segoe UI',Tahoma,Geneva,Verdana,sans-serif;background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);color:var(--text-color);line-height:1.6;min-height:100vh;padding:clamp(1rem, 3vw, 2rem) clamp(0.75rem, 2vw, 1rem);overflow-x:hidden;-webkit-font-smoothing:antialiased}img,svg,iframe,video,canvas{max-width:100%;height:auto;display:block}:root{--primary-color:#6366f1;--primary-dark:#4f46e5;--secondary-color:#8b5cf6;--accent-color:#ec4899;--bg-color:#f8fafc;--card-bg:#ffffff;--text-color:#1e293b;--text-light:#64748b;--border-color:#e2e8f0;--success-color:#10b981;--shadow:0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);--shadow-lg:0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05)}.back-btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;padding:.75rem 1.5rem;background:var(--card-bg);color:var(--primary-color);text-decoration:none;border-radius:12px;font-weight:600;font-size:clamp(0.9rem, 2.5vw, 1rem);box-shadow:var(--shadow);transition:all 0.3s ease;margin-bottom:clamp(1.5rem, 3vw, 2rem);position:relative;overflow:hidden;border:2px solid #fff0;min-height:48px;width:fit-content}.back-btn::before{content:'';position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,rgb(99 102 241 / .1),transparent);transition:left 0.5s ease}.back-btn:hover::before{left:100%}.back-btn:hover{background:var(--primary-color);color:#fff;transform:translateX(-5px);box-shadow:var(--shadow-lg);border-color:var(--primary-color)}.back-btn:active{transform:translateX(-3px) scale(.98)}.container{max-width:800px;width:100%;margin:0 auto;background:var(--card-bg);padding:clamp(1.5rem, 4vw, 2.5rem) clamp(1rem, 3vw, 2rem);border-radius:16px;box-shadow:var(--shadow-lg);animation:fadeInUp 0.6s ease}.container h1{font-size:clamp(1.5rem, 5vw, 2rem);color:var(--primary-color);margin-bottom:1rem;text-align:center;line-height:1.3}.container>p{font-size:clamp(0.95rem, 2.5vw, 1rem);color:var(--text-light);text-align:center;margin-bottom:clamp(1.5rem, 3vw, 2rem);line-height:1.7}.input-box{display:flex;flex-direction:column;gap:1rem;margin-bottom:clamp(1.5rem, 3vw, 2rem);width:100%}#colorInput{width:100%;height:clamp(60px, 12vw, 80px);border:3px solid var(--border-color);border-radius:12px;cursor:pointer;transition:all 0.3s ease;min-height:48px}#colorInput:hover{border-color:var(--primary-color);box-shadow:0 0 0 4px rgb(99 102 241 / .1)}#colorInput:focus{outline:none;border-color:var(--primary-color);box-shadow:0 0 0 4px rgb(99 102 241 / .2)}#hexInput{width:100%;padding:clamp(0.85rem, 2.5vw, 1rem) clamp(1rem, 2.5vw, 1.25rem);font-size:clamp(0.95rem, 2.5vw, 1rem);border:2px solid var(--border-color);border-radius:12px;transition:all 0.3s ease;font-family:'Courier New',monospace;font-weight:500;min-height:48px}#hexInput:focus{outline:none;border-color:var(--primary-color);box-shadow:0 0 0 4px rgb(99 102 241 / .1)}#hexInput::placeholder{color:var(--text-light)}#pickBtn{padding:clamp(0.85rem, 2.5vw, 1rem) clamp(1.5rem, 3vw, 2rem);background:linear-gradient(135deg,var(--primary-color) 0%,var(--secondary-color) 100%);color:#fff;border:none;border-radius:12px;font-size:clamp(0.95rem, 2.5vw, 1.05rem);font-weight:600;cursor:pointer;transition:all 0.3s ease;box-shadow:var(--shadow);position:relative;overflow:hidden;width:100%;min-height:48px}#pickBtn::before{content:'';position:absolute;top:50%;left:50%;width:0;height:0;border-radius:50%;background:rgb(255 255 255 / .3);transform:translate(-50%,-50%);transition:width 0.6s,height 0.6s}#pickBtn:hover::before{width:300px;height:300px}#pickBtn:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg)}#pickBtn:active{transform:translateY(-1px)}.color-output{background:var(--bg-color);padding:clamp(1rem, 3vw, 2rem);border-radius:12px;border:2px solid var(--border-color);min-height:200px;display:flex;flex-direction:column;gap:1.5rem;width:100%}.color-output.active{border-color:var(--primary-color)}.color-preview{width:100%;height:clamp(100px, 20vw, 150px);border-radius:12px;border:3px solid var(--border-color);box-shadow:var(--shadow);transition:all 0.3s ease}.color-values{display:flex;flex-direction:column;gap:1rem;width:100%}.color-value-item{display:flex;align-items:center;justify-content:space-between;padding:clamp(0.75rem, 2vw, 1rem) clamp(0.75rem, 2vw, 1.25rem);background:#fff;border-radius:8px;border:2px solid var(--border-color);transition:all 0.3s ease;gap:.5rem;flex-wrap:wrap;min-height:44px}.color-value-item:hover{border-color:var(--primary-color);box-shadow:var(--shadow)}.color-value-item .label{font-weight:600;color:var(--text-color);font-size:clamp(0.85rem, 2.5vw, 0.95rem)}.color-value-item .value{font-family:'Courier New',monospace;font-weight:500;color:var(--text-light);font-size:clamp(0.8rem, 2.5vw, 0.95rem);word-break:break-all}.color-value-item button{padding:.5rem 1rem;background:var(--primary-color);color:#fff;border:none;border-radius:6px;font-size:clamp(0.8rem, 2.5vw, 0.9rem);font-weight:500;cursor:pointer;transition:all 0.3s ease;min-height:36px}.color-value-item button:hover{background:var(--primary-dark);transform:scale(1.05)}.color-value-item button:active{transform:scale(.98)}.copy-success{position:fixed;top:1rem;right:1rem;max-width:90vw;background:var(--success-color);color:#fff;padding:1rem 1.5rem;border-radius:8px;box-shadow:var(--shadow-lg);font-weight:500;font-size:clamp(0.85rem, 2.5vw, 0.95rem);animation:slideInRight 0.3s ease,slideOutRight 0.3s ease 2s forwards;z-index:1000}@media (min-width:640px){.container h1{font-size:clamp(1.75rem, 4vw, 2.25rem)}.copy-success{top:2rem;right:2rem;max-width:none}.input-box{display:grid;grid-template-columns:150px 1fr auto;align-items:center}#colorInput{height:clamp(50px, 8vw, 60px)}#pickBtn{width:auto}}@media (min-width:768px){body{padding:clamp(2rem, 4vw, 3rem) clamp(1.5rem, 3vw, 2rem)}.container{padding:clamp(2rem, 4vw, 3rem) clamp(2rem, 3vw, 2.5rem)}.container h1{font-size:clamp(2rem, 4vw, 2.5rem)}.container>p{font-size:clamp(1rem, 2.5vw, 1.1rem)}}@media (min-width:1024px){.container h1{font-size:clamp(2.25rem, 4vw, 3rem)}.color-values{display:grid;grid-template-columns:repeat(3,1fr);gap:1rem}}@keyframes fadeInUp{from{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}@keyframes slideInRight{from{opacity:0;transform:translateX(100px)}to{opacity:1;transform:translateX(0)}}@keyframes slideOutRight{from{opacity:1;transform:translateX(0)}to{opacity:0;transform:translateX(100px)}}@keyframes pulse{0%,100%{transform:scale(1)}50%{transform:scale(1.05)}}*:focus{outline:2px solid var(--primary-color);outline-offset:2px}@media (prefers-reduced-motion:reduce){*,*::before,*::after{animation-duration:0.01ms!important;animation-iteration-count:1!important;transition-duration:0.01ms!important}}.text-center{text-align:center}.mt-1{margin-top:1rem}.mt-2{margin-top:2rem}.mb-1{margin-bottom:1rem}.mb-2{margin-bottom:2rem}.hidden{display:none}.visible{display:block}.copy-btn{padding:.75rem 1.25rem;background:linear-gradient(135deg,#6366f1 0%,#8b5cf6 100%);color:#fff;border:none;border-radius:10px;font-size:clamp(0.85rem, 2.5vw, 0.9rem);font-weight:600;cursor:pointer;transition:all 0.3s ease;box-shadow:0 4px 8px rgb(99 102 241 / .3);white-space:nowrap;flex-shrink:0;display:flex;align-items:center;gap:.4rem;position:relative;overflow:hidden;min-height:44px}.copy-btn::before{content:'';position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,rgb(255 255 255 / .3),transparent);transition:left 0.6s ease}.copy-btn:hover::before{left:100%}.copy-btn:hover{transform:translateY(-2px) scale(1.02);box-shadow:0 6px 15px rgb(99 102 241 / .4);background:linear-gradient(135deg,#4f46e5 0%,#7c3aed 100%)}.copy-btn:active{transform:translateY(0) scale(.98)}.copy-btn.copied{background:linear-gradient(135deg,#10b981 0%,#059669 100%);animation:successPulse 0.5s ease}@keyframes successPulse{0%,100%{transform:scale(1)}50%{transform:scale(1.05)}}.ad-sidebar{width:100%;max-width:300px;margin:20px auto;text-align:center;border-radius:8px}.blog-cta{background:linear-gradient(135deg,rgb(99 102 241 / .1) 0%,rgb(139 92 246 / .1) 100%);border:2px solid var(--primary-color);border-radius:12px;padding:clamp(1.5rem, 4vw, 2.5rem);text-align:center;width:100%;margin:clamp(1.5rem, 3vw, 2rem) 0}.blog-cta-content h3{font-size:clamp(1.4rem, 4vw, 1.8rem);color:var(--text-color);margin-bottom:1rem;font-weight:700;line-height:1.3}.blog-cta-content p{font-size:clamp(1rem, 2.5vw, 1.1rem);color:var(--text-light);margin-bottom:1.5rem;line-height:1.8}.blog-btn{display:inline-flex;align-items:center;justify-content:center;padding:clamp(0.85rem, 2.5vw, 1rem) clamp(1.5rem, 4vw, 2.5rem);background:linear-gradient(135deg,var(--primary-color) 0%,var(--secondary-color) 100%);color:#fff;text-decoration:none;border-radius:10px;font-weight:700;font-size:clamp(1rem, 2.5vw, 1.05rem);box-shadow:var(--shadow);transition:all 0.3s ease;min-height:48px}.blog-btn:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg)}.seo-article{background:var(--bg-color);border-radius:12px;padding:clamp(1.5rem, 4vw, 2rem);margin:clamp(1.5rem, 3vw, 2rem) 0;border:2px solid var(--border-color);transition:box-shadow 0.3s ease;width:100%}.seo-article:hover{box-shadow:var(--shadow)}.seo-article h2{color:var(--primary-color);margin-bottom:1.5rem;font-size:clamp(1.3rem, 3.5vw, 1.5rem);font-weight:700;line-height:1.3}.seo-article p{margin-bottom:1.25rem;line-height:1.7;color:var(--text-color);font-size:clamp(0.95rem, 2.5vw, 1rem);overflow-wrap:break-word}.seo-article strong{color:var(--primary-dark);font-weight:600}.faq-section{background:var(--card-bg);border-radius:12px;padding:clamp(1.5rem, 4vw, 2rem);margin:clamp(1.5rem, 3vw, 2rem) 0;border:2px solid var(--border-color);width:100%}.faq-section h2{color:var(--primary-color);margin-bottom:1.5rem;font-size:clamp(1.3rem, 3.5vw, 1.5rem);font-weight:700;text-align:center}.faq-item{background:var(--bg-color);border-radius:10px;padding:clamp(1rem, 3vw, 1.5rem);margin-bottom:1rem;border-left:4px solid var(--primary-color);transition:all 0.3s ease;overflow-wrap:break-word}.faq-item:hover{border-color:var(--primary-dark);box-shadow:var(--shadow)}.faq-item h3{font-size:clamp(1rem, 2.5vw, 1.1rem);color:var(--text-color);margin-bottom:.75rem;font-weight:600}.faq-item p{margin:0;color:var(--text-light);line-height:1.7;font-size:clamp(0.9rem, 2.5vw, 0.95rem)}@media (min-width:640px){.seo-article,.faq-section{padding:clamp(2rem, 4vw, 2.5rem)}.seo-article h2,.faq-section h2{font-size:clamp(1.5rem, 3vw, 1.75rem)}}@media (min-width:768px){.seo-article,.faq-section{padding:clamp(2.5rem, 4vw, 3rem)}.seo-article h2,.faq-section h2{font-size:clamp(1.75rem, 3.5vw, 2rem)}.faq-item h3{font-size:clamp(1.1rem, 2.5vw, 1.2rem)}}@media (max-width:639px){.seo-article,.faq-section{padding:1.5rem}.seo-article h2,.faq-section h2{font-size:1.25rem}.faq-item h3{font-size:1rem}.faq-item p{font-size:.95rem}}.faq-item:focus-within{outline:2px solid var(--primary-color);outline-offset:2px}@media (prefers-reduced-motion:reduce){.seo-article,.faq-item{transition:none!important}}@media (prefers-contrast:high){.seo-article,.faq-section{border-width:3px}.faq-item{border-left-width:6px}}.random-btn{position:relative;overflow:hidden;min-height:44px}.random-btn::before{content:'';position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,rgb(255 255 255 / .3),transparent);transition:left 0.5s ease}.random-btn:hover::before{left:100%}.random-btn:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg)}.random-btn:active{transform:translateY(0)}.advanced-features{transition:box-shadow 0.3s ease;width:100%}.advanced-features:hover{box-shadow:var(--shadow)}.feature-tab{position:relative;min-height:44px;cursor:pointer}.feature-tab.active,.feature-tab:hover{background:var(--primary-color);color:#fff;border-color:var(--primary-color)}.feature-tab.active::after{content:'';position:absolute;bottom:-6px;left:50%;transform:translateX(-50%);width:0;height:0;border-left:6px solid #fff0;border-right:6px solid #fff0;border-top:6px solid var(--primary-color)}.color-swatch{width:100%;aspect-ratio:1;border-radius:8px;border:2px solid var(--border-color);cursor:pointer;transition:all 0.2s ease;position:relative;display:flex;align-items:center;justify-content:center;min-height:40px}.color-swatch:hover{border-color:var(--primary-color);transform:scale(1.05);box-shadow:var(--shadow)}.color-swatch .favorite-toggle{position:absolute;top:-6px;right:-6px;width:20px;height:20px;background:var(--card-bg);border:2px solid var(--border-color);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:.7rem;cursor:pointer;transition:all 0.2s ease;z-index:1}.color-swatch .favorite-toggle:hover,.color-swatch .favorite-toggle.active{background:var(--accent-color);border-color:var(--accent-color);color:#fff}.color-swatch .hex-label{position:absolute;bottom:-22px;left:50%;transform:translateX(-50%);font-size:.7rem;color:var(--text-light);font-family:monospace;white-space:nowrap;opacity:0;transition:opacity 0.2s ease;pointer-events:none}.color-swatch:hover .hex-label{opacity:1}.shade-cell{width:clamp(32px, 8vw, 40px);height:clamp(32px, 8vw, 40px);border-radius:6px;border:2px solid var(--border-color);cursor:pointer;transition:all 0.2s ease;position:relative;min-width:32px}.shade-cell:hover{transform:scale(1.1);border-color:var(--primary-color);box-shadow:var(--shadow)}.shade-cell .shade-value{position:absolute;bottom:-20px;left:50%;transform:translateX(-50%);font-size:.65rem;color:var(--text-light);font-family:monospace;white-space:nowrap;opacity:0;transition:opacity 0.2s ease;pointer-events:none}.shade-cell:hover .shade-value{opacity:1}.contrast-pass{color:var(--success-color);font-weight:700}.contrast-fail{color:#ef4444;font-weight:700}.contrast-color{transition:all 0.3s ease}.contrast-color:hover{transform:scale(1.05)}#colorNameBox{transition:all 0.3s ease}#colorNameBox:hover{border-color:var(--primary-color);box-shadow:var(--shadow)}.empty-state{text-align:center;padding:clamp(1rem, 3vw, 1.5rem);color:var(--text-light);font-size:clamp(0.85rem, 2.5vw, 0.9rem);background:var(--card-bg);border-radius:8px;border:2px dashed var(--border-color);width:100%}@media (min-width:640px){.feature-tabs{gap:.75rem}.feature-tab{padding:.625rem 1.25rem;font-size:.95rem}.shade-cell{width:45px;height:45px}}@media (max-width:639px){.feature-tabs{justify-content:flex-start;overflow-x:auto;padding-bottom:.5rem;-webkit-overflow-scrolling:touch;scrollbar-width:none}.feature-tabs::-webkit-scrollbar{display:none}.feature-tab{flex-shrink:0;padding:.5rem .875rem;font-size:.85rem}.contrast-pair{flex-direction:column;gap:.5rem}}.feature-tab:focus-visible,.contrast-btn:focus-visible,.color-swatch:focus-visible,.shade-cell:focus-visible{outline:2px solid var(--primary-color);outline-offset:2px}@media (prefers-reduced-motion:reduce){.random-btn,.color-swatch,.shade-cell,.contrast-color{transition:none!important;transform:none!important}}.section-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:1rem;flex-wrap:wrap;gap:.5rem;width:100%}.copy-all-btn{padding:.5rem 1rem;background:var(--bg-color);color:var(--primary-color);border:2px solid var(--border-color);border-radius:8px;font-size:clamp(0.8rem, 2.5vw, 0.85rem);font-weight:600;cursor:pointer;transition:all 0.3s ease;display:flex;align-items:center;gap:.4rem;min-height:44px;white-space:nowrap}.copy-all-btn:hover{background:rgb(99 102 241 / .1);border-color:var(--primary-color);transform:translateY(-1px)}.harmony-section{background:var(--bg-color);border-radius:12px;padding:clamp(1rem, 3vw, 1.5rem);margin:clamp(1.5rem, 3vw, 2rem) 0;border:2px solid var(--border-color);transition:box-shadow 0.3s ease;width:100%}.harmony-section:hover{box-shadow:var(--shadow)}.harmony-tabs{display:flex;flex-wrap:wrap;gap:.5rem;justify-content:center;margin-bottom:1rem}.harmony-tab{padding:.5rem 1rem;background:var(--card-bg);border:2px solid var(--border-color);border-radius:8px;font-size:clamp(0.8rem, 2.5vw, 0.85rem);cursor:pointer;transition:all 0.2s ease;min-height:44px;display:inline-flex;align-items:center}.harmony-tab.active,.harmony-tab:hover{background:var(--primary-color);color:#fff;border-color:var(--primary-color)}.harmony-display{display:grid;grid-template-columns:repeat(auto-fit,minmax(60px,1fr));gap:clamp(0.5rem, 2vw, 0.75rem)}.harmony-swatch{height:clamp(45px, 8vw, 60px);border-radius:8px;cursor:pointer;border:2px solid var(--border-color);transition:all 0.2s ease;position:relative}.harmony-swatch:hover{transform:scale(1.05);border-color:var(--primary-color);box-shadow:var(--shadow)}.harmony-swatch span{position:absolute;bottom:-20px;left:50%;transform:translateX(-50%);font-size:.7rem;color:var(--text-light);font-family:monospace;opacity:0;transition:opacity 0.2s;white-space:nowrap;pointer-events:none}.harmony-swatch:hover span{opacity:1}.accessibility-section{background:var(--card-bg);border-radius:12px;padding:clamp(1rem, 3vw, 1.5rem);margin:clamp(1.5rem, 3vw, 2rem) 0;border:2px solid var(--border-color);width:100%}.preview-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1rem}.preview-card{background:var(--bg-color);border-radius:8px;padding:1rem;text-align:center}.contrast-info{margin-top:1rem;text-align:center}.contrast-info strong{color:var(--primary-color)}.color-code-item[data-format="css-var"]{border-top:2px dashed var(--border-color);padding-top:1rem;margin-top:1rem}@keyframes slideIn{from{opacity:0;transform:translateX(100px)}to{opacity:1;transform:translateX(0)}}@keyframes slideOut{from{opacity:1;transform:translateX(0)}to{opacity:0;transform:translateX(100px)}}@media (max-width:479px){.input-box{gap:.85rem}.color-value-item{flex-direction:column;align-items:flex-start}.color-value-item button{width:100%;margin-top:.25rem}.back-btn{width:100%;justify-content:center}.harmony-tabs{overflow-x:auto;flex-wrap:nowrap;padding-bottom:.75rem}.harmony-tab{flex-shrink:0}.preview-grid{grid-template-columns:1fr}.section-header{flex-direction:column;align-items:stretch;text-align:center}}