.nav a.active{color:var(--primary);font-weight:600}
.tool-main{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-bottom:30px}
.tool-desc{color:var(--text-light);margin-bottom:16px;font-size:0.9375rem}
.grayscale-bar{height:60px;border-radius:8px;margin-bottom:8px}
.grayscale-labels{display:flex;justify-content:space-between;font-size:0.75rem;color:var(--text-light);margin-bottom:16px}
.grayscale-actions{display:flex;gap:12px;margin-bottom:16px}
.steps-select{display:flex;align-items:center;gap:12px}
.steps-select select{padding:8px 12px;border:1px solid var(--border);border-radius:6px}
.gray-grid{display:grid;grid-template-columns:repeat(8,1fr);gap:8px}
.gray-grid .gray-item{height:50px;border-radius:6px;cursor:pointer;border:1px solid var(--border)}
.backlight-preview{height:200px;background:#000;border-radius:12px;margin-bottom:16px}
.backlight-tips{background:var(--bg-gray);padding:16px;border-radius:8px;margin-bottom:16px}
.backlight-tips h3{font-size:0.9375rem;margin-bottom:8px}
.backlight-tips ul{padding-left:20px;color:var(--text-light);font-size:0.875rem}
.backlight-tips li{margin-bottom:4px}
.backlight-actions{text-align:center}
.level-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}
.level-item{height:80px;border-radius:8px;cursor:pointer;display:flex;align-items:flex-end;justify-content:center;padding-bottom:8px}
.level-item span{background:rgba(255,255,255,0.8);padding:2px 8px;border-radius:4px;font-size:0.75rem}
.refresh-display{text-align:center;padding:40px;background:var(--bg-gray);border-radius:12px;margin-bottom:20px}
.refresh-value{font-size:4rem;font-weight:700;color:var(--primary)}
.refresh-unit{font-size:1.5rem;color:var(--text-light)}
.refresh-info{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-bottom:20px}
.info-row{background:var(--bg-gray);padding:12px;border-radius:8px;text-align:center}
.info-row span:first-child{display:block;font-size:0.75rem;color:var(--text-light)}
.refresh-actions{display:flex;gap:12px;justify-content:center}
.animation-box{height:100px;background:var(--bg-gray);border-radius:8px;position:relative;overflow:hidden;margin-bottom:16px}
.moving-block{width:60px;height:60px;background:var(--primary);border-radius:8px;position:absolute;top:20px;left:0}
.animation-controls{display:flex;align-items:center;gap:12px}
.animation-controls input{flex:1}
.animation-controls #speedValue{min-width:24px;text-align:center;font-weight:600;color:var(--primary)}
.ufo-test-area{background:#111;border-radius:12px;padding:20px;margin-bottom:16px}
.ufo-track{height:40px;background:#222;border-radius:4px;margin-bottom:12px;position:relative;overflow:hidden}
.ufo-block{width:40px;height:40px;background:#fff;position:absolute;left:0}
.response-controls{display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.response-controls select{padding:8px 12px;border:1px solid var(--border);border-radius:6px}
.bw-test-area{height:150px;background:#000;border-radius:12px;margin-bottom:16px}
.bw-controls{display:flex;align-items:center;gap:12px}
.bw-controls select{padding:8px 12px;border:1px solid var(--border);border-radius:6px}
.result-box{background:var(--bg-gray);border-radius:12px;padding:16px;margin-bottom:16px}
.result-item{display:flex;justify-content:space-between;align-items:center;padding:10px 0;border-bottom:1px solid var(--border)}
.result-item:last-child{border-bottom:none}
.result-label{color:var(--text-light);font-size:0.875rem}
.result-value{font-weight:600;color:var(--primary)}
.result-buttons{display:grid;grid-template-columns:repeat(2,1fr);gap:8px;margin-bottom:16px}
.result-buttons .btn{padding:10px;font-size:0.8125rem}
.result-tips{background:var(--bg-gray);border-radius:8px;padding:16px;margin-top:16px}
.result-tips h3{font-size:0.9375rem;margin-bottom:8px}
.result-tips ul{padding-left:20px;color:var(--text-light);font-size:0.875rem}
.result-tips li{margin-bottom:4px}
.standard-colors{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-bottom:24px}
.std-color{height:100px;border-radius:8px;cursor:pointer;display:flex;align-items:center;justify-content:center}
.std-color span{background:rgba(0,0,0,0.5);color:#fff;padding:8px 12px;border-radius:6px;font-size:0.75rem;text-align:center}
.gradient-tests{display:grid;gap:12px}
.gradient-tests .gradient-bar{height:40px;border-radius:6px}
.skin-tone-test{margin-top:30px}
.skin-colors{display:grid;grid-template-columns:repeat(6,1fr);gap:12px}
.skin-color{height:80px;border-radius:8px;cursor:pointer;display:flex;align-items:flex-end;justify-content:center;padding-bottom:8px}
.skin-color span{background:rgba(0,0,0,0.5);color:#fff;padding:2px 8px;border-radius:4px;font-size:0.75rem}
.contrast-display{display:grid;grid-template-columns:1fr 1fr;height:200px;border-radius:12px;overflow:hidden;margin-bottom:16px}
.contrast-half{cursor:pointer}
.contrast-half.black{background:#000}
.contrast-half.white{background:#fff}
.contrast-actions{text-align:center;margin-bottom:20px}
.dark-levels,.light-levels{display:grid;grid-template-columns:repeat(8,1fr);gap:4px;margin-bottom:20px}
.dark-levels div,.light-levels div{height:40px;border-radius:4px}
.checkerboard{height:200px;border-radius:12px;cursor:pointer;margin-bottom:16px}
.viewing-test-area{background:var(--bg-gray);padding:20px;border-radius:12px;margin-bottom:16px}
.viewing-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}
.vg-item{height:80px;border-radius:6px}
.viewing-actions{text-align:center;margin-bottom:20px}
.guide-list{display:grid;gap:12px}
.guide-item{display:flex;align-items:center;gap:12px;background:var(--bg-gray);padding:12px;border-radius:8px}
.guide-num{width:32px;height:32px;background:var(--primary);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:600;flex-shrink:0}
.guide-item p{margin:0;color:var(--text-light)}
.panel-compare{margin-top:30px}
.compare-table{border:1px solid var(--border);border-radius:8px;overflow:hidden}
.compare-row{display:grid;grid-template-columns:1fr 1fr 2fr 1.5fr;padding:12px 16px;border-bottom:1px solid var(--border)}
.compare-row:last-child{border-bottom:none}
.compare-row.header{background:var(--bg-gray);font-weight:600}
.wp-color-picker{display:flex;align-items:center;gap:12px;margin-bottom:16px}
.wp-color-picker input{width:60px;height:40px;border:none;border-radius:8px;cursor:pointer}
.wp-preset-colors{display:grid;grid-template-columns:repeat(6,1fr);gap:8px;margin-bottom:24px}
.wp-color{height:40px;border-radius:6px;cursor:pointer;border:2px solid transparent}
.wp-color:hover{border-color:var(--primary)}
.wp-resolutions{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-bottom:16px}
.wp-res-item{display:flex;align-items:center;gap:8px;padding:10px;background:var(--bg-gray);border-radius:8px;cursor:pointer}
.wp-res-item:has(input:checked){background:var(--primary);color:#fff}
.wp-res-item input{display:none}
.wp-custom-res{display:flex;align-items:center;gap:8px;margin-bottom:16px}
.wp-custom-res input{width:100px;padding:8px;border:1px solid var(--border);border-radius:6px}
.wp-preview-box{height:200px;border-radius:12px;margin-bottom:16px;border:2px solid var(--border)}
.popular-wallpapers{padding:40px 0;background:var(--bg-gray)}
.popular-wallpapers h2{text-align:center;margin-bottom:8px}
.popular-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:24px}
.popular-item{height:120px;border-radius:12px;cursor:pointer;display:flex;align-items:flex-end;justify-content:center;padding-bottom:12px}
.popular-item span{background:rgba(0,0,0,0.5);color:#fff;padding:4px 12px;border-radius:4px;font-size:0.875rem}
.related-tools{padding:60px 0;background:var(--bg-gray)}
.related-tools h2{text-align:center;margin-bottom:32px}
.tools-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.tool-card{display:block;background:var(--bg);padding:20px;border-radius:12px;text-align:center;text-decoration:none;transition:transform 0.2s,box-shadow 0.2s}
.tool-card:hover{transform:translateY(-4px);box-shadow:var(--shadow);text-decoration:none}
.tool-icon{font-size:2rem;display:block;margin-bottom:8px}
.tool-card h3{font-size:1rem;margin-bottom:4px;color:var(--text)}
.tool-card p{font-size:0.8125rem;color:var(--text-light);margin:0}
.btn-large{padding:14px 32px;font-size:1rem}
@media(max-width:900px){.tool-main{grid-template-columns:1fr}.tools-grid{grid-template-columns:repeat(2,1fr)}.popular-grid{grid-template-columns:repeat(2,1fr)}.wp-resolutions{grid-template-columns:repeat(2,1fr)}.compare-row{grid-template-columns:1fr;gap:4px}.standard-colors{grid-template-columns:repeat(2,1fr)}}
@media(max-width:600px){.tools-grid{grid-template-columns:1fr}.skin-colors{grid-template-columns:repeat(3,1fr)}.wp-preset-colors{grid-template-columns:repeat(4,1fr)}}