*{margin:0;padding:0;box-sizing:border-box}
:root{--primary:#2563eb;--primary-dark:#1d4ed8;--text:#1f2937;--text-light:#6b7280;--bg:#ffffff;--bg-gray:#f3f4f6;--border:#e5e7eb;--shadow:0 4px 6px -1px rgba(0,0,0,0.1)}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;color:var(--text);line-height:1.6;background:var(--bg-gray)}
.container{max-width:1200px;margin:0 auto;padding:0 20px}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}
.header{background:var(--bg);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:100}
.header .container{display:flex;justify-content:space-between;align-items:center;height:50px}
.logo a{display:flex;align-items:center;gap:8px;font-size:1.125rem;font-weight:700;color:var(--text)}
.logo img{border-radius:6px;width:32px;height:32px}
.nav{display:flex;gap:20px}
.nav a{color:var(--text-light);font-weight:500;transition:color 0.2s;font-size:0.875rem}
.nav a:hover{color:var(--primary);text-decoration:none}
.tool-section{padding:20px 0 30px;background:var(--bg-gray)}
.tool-header{text-align:center;margin-bottom:20px}
.tool-header h1{font-size:1.5rem;margin-bottom:6px}
.tool-header p{color:var(--text-light);font-size:0.9375rem}
.tool-panel{display:grid;grid-template-columns:300px 1fr;gap:20px;background:var(--bg);border-radius:12px;padding:20px;box-shadow:var(--shadow);align-items:stretch}
.panel-left{display:flex;flex-direction:column}
.panel-left h2,.panel-right h2,.panel-right h3{font-size:1rem;font-weight:600;margin-bottom:10px;color:var(--text)}
.custom-color{margin-bottom:16px}
.custom-color .label{font-size:0.8125rem;color:var(--text-light);display:block;margin-bottom:6px}
.color-input-wrap{position:relative}
.color-input-wrap input[type="color"]{width:100%;height:42px;border:2px solid var(--border);border-radius:8px;cursor:pointer;padding:3px}
.color-input-wrap input[type="color"]::-webkit-color-swatch-wrapper{padding:0}
.color-input-wrap input[type="color"]::-webkit-color-swatch{border-radius:4px;border:none}
.color-tip{display:block;text-align:center;font-size:0.75rem;color:var(--text-light);margin-top:6px}
.color-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;flex:1}
.color-item{cursor:pointer;text-align:center;padding:6px;border-radius:8px;border:2px solid transparent;transition:all 0.2s}
.color-item:hover{border-color:var(--border)}
.color-item.active{border-color:var(--primary)}
.color-box{width:100%;height:40px;border-radius:6px;border:1px solid var(--border);margin-bottom:4px}
.color-item span{font-size:0.75rem;color:var(--text-light)}
.preview-section{margin-bottom:16px}
.preview-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px}
.color-code{display:flex;align-items:center;gap:8px}
.color-code span{font-family:monospace;font-size:0.875rem;color:var(--text-light)}
.color-indicator{width:24px;height:24px;border-radius:4px;border:1px solid var(--border)}
.preview-box{position:relative;height:240px;border-radius:10px;border:2px solid var(--border);overflow:hidden}
.fullscreen-btn{position:absolute;bottom:10px;right:10px;width:36px;height:36px;background:rgba(255,255,255,0.9);border:none;border-radius:8px;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background 0.2s}
.fullscreen-btn:hover{background:#fff}
.fullscreen-btn svg{color:var(--text);width:20px;height:20px}
.controls-section{border-top:1px solid var(--border);padding-top:16px;margin-bottom:16px}
.control-group{margin-bottom:16px}
.control-group h3{margin-bottom:10px}
.brightness-control{display:flex;align-items:center;gap:10px}
.brightness-icon{font-size:1.125rem;color:var(--text-light);flex-shrink:0}
.brightness-control input[type="range"]{flex:1;height:6px;-webkit-appearance:none;appearance:none;background:linear-gradient(to right,var(--primary) 100%,var(--border) 100%);border-radius:3px}
.brightness-control input[type="range"]::-webkit-slider-thumb{-webkit-appearance:none;width:16px;height:16px;background:var(--primary);border-radius:50%;cursor:pointer}
.brightness-values{display:flex;gap:8px;font-size:0.75rem;color:var(--text-light);flex-shrink:0}
.brightness-values span:nth-child(2){color:var(--primary);font-weight:600}
.resolution-control{display:flex;gap:10px;align-items:flex-end}
.resolution-select{flex:1}
.resolution-select label,.input-group label{display:block;font-size:0.75rem;color:var(--text-light);margin-bottom:4px}
.resolution-select select{width:100%;padding:8px 10px;border:1px solid var(--border);border-radius:8px;font-size:0.875rem;background:var(--bg);cursor:pointer}
.resolution-inputs{display:flex;gap:10px}
.input-group input{width:80px;padding:8px 10px;border:1px solid var(--border);border-radius:8px;font-size:0.875rem}
.action-buttons{display:flex;gap:10px}
.btn{flex:1;padding:12px 20px;border-radius:8px;font-weight:600;cursor:pointer;transition:all 0.2s;border:none;font-size:0.9375rem;text-align:center}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-dark)}
.btn-secondary{background:#10b981;color:#fff}
.btn-secondary:hover{background:#059669}
.device-info{background:var(--bg-gray);border-radius:10px;padding:14px}
.device-info h3{margin-bottom:10px;font-size:0.9375rem}
.device-info .info-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}
.device-info .info-item{background:var(--bg);padding:10px;border-radius:8px;text-align:center}
.device-info .info-label{display:block;font-size:0.75rem;color:var(--text-light);margin-bottom:3px}
.device-info .info-value{font-size:0.875rem;font-weight:600;color:var(--primary)}
.features{padding:60px 0;background:var(--bg)}
.features h2,.guide h2,.scenarios h2,.faq h2{font-size:1.5rem;text-align:center;margin-bottom:32px}
.feature-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:24px}
.feature-item{background:var(--bg-gray);padding:24px;border-radius:12px;text-align:center}
.feature-icon{font-size:2.5rem;margin-bottom:12px}
.feature-item h3{font-size:1.125rem;margin-bottom:8px}
.feature-item p{color:var(--text-light);font-size:0.9375rem}
.guide{padding:60px 0;background:var(--bg-gray)}
.guide-steps{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:24px}
.step{background:var(--bg);padding:24px;border-radius:12px;text-align:center}
.step-number{width:48px;height:48px;background:var(--primary);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1.25rem;font-weight:700;margin:0 auto 16px}
.step h3{margin-bottom:8px}
.step p{color:var(--text-light);font-size:0.9375rem}
.scenarios{padding:60px 0;background:var(--bg)}
.scenario-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.scenario-item{background:var(--bg-gray);padding:24px;border-radius:12px}
.scenario-item h3{margin-bottom:8px}
.scenario-item p{color:var(--text-light);font-size:0.9375rem}
.faq{padding:60px 0;background:var(--bg-gray)}
.faq-list{max-width:800px;margin:0 auto}
.faq-item{background:var(--bg);border-radius:8px;margin-bottom:12px;overflow:hidden}
.faq-item summary{padding:16px 20px;cursor:pointer;font-weight:600;list-style:none;display:flex;justify-content:space-between;align-items:center}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";font-size:1.25rem;color:var(--primary)}
.faq-item[open] summary::after{content:"-"}
.faq-item p{padding:0 20px 16px;color:var(--text-light)}
.intro-section{padding:50px 0;background:var(--bg)}
.intro-section h2{font-size:1.5rem;text-align:center;margin-bottom:24px}
.intro-content{display:grid;grid-template-columns:auto 1fr;gap:30px;align-items:center;max-width:900px;margin:0 auto}
.intro-image img{width:280px;height:auto;border-radius:12px;box-shadow:var(--shadow)}
.intro-text p{margin-bottom:16px;line-height:1.8}
@media(max-width:768px){.intro-content{grid-template-columns:1fr}.intro-image{text-align:center}.intro-image img{width:100%;max-width:400px}}
.more-tools{padding:60px 0;background:var(--bg)}
.more-tools h2{font-size:1.5rem;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-gray);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}
@media(max-width:900px){.tools-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:600px){.tools-grid{grid-template-columns:1fr}}
.knowledge{padding:60px 0;background:var(--bg)}
.knowledge h2{font-size:1.5rem;text-align:center;margin-bottom:32px}
.knowledge-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.knowledge-item{background:var(--bg-gray);padding:24px;border-radius:12px}
.knowledge-item h3{font-size:1rem;margin-bottom:12px;color:var(--primary)}
.knowledge-item p{font-size:0.9375rem;color:var(--text-light);line-height:1.7}
.device-types{padding:60px 0;background:var(--bg-gray)}
.device-types h2{font-size:1.5rem;text-align:center;margin-bottom:32px}
.device-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.device-item{background:var(--bg);padding:20px;border-radius:12px;text-align:center}
.device-icon{font-size:2rem;display:block;margin-bottom:8px}
.device-item h3{font-size:0.9375rem;margin-bottom:6px}
.device-item p{font-size:0.75rem;color:var(--text-light)}
.fullscreen-overlay{position:fixed;top:0;left:0;width:100vw;height:100vh;z-index:9999;display:none;cursor:pointer}
.fullscreen-overlay.active{display:flex;align-items:center;justify-content:center}
body.fullscreen-active{overflow:hidden}
.fullscreen-hint{padding:30px 60px;border-radius:20px;text-align:center;opacity:1;transition:opacity 0.5s}
.fullscreen-hint span{font-size:2.5rem;font-weight:600;display:block}
.fullscreen-hint.fade-out{opacity:0}
@media(max-width:768px){.fullscreen-hint span{font-size:1.5rem}.fullscreen-hint{padding:20px 30px}}
.footer{background:#1f2937;color:#9ca3af;padding:40px 0 20px}
.footer-content{text-align:center;margin-bottom:24px}
.footer-logo{display:flex;align-items:center;justify-content:center;gap:8px;margin-bottom:12px;color:#fff;font-weight:600}
.footer-desc{max-width:600px;margin:0 auto 12px;font-size:0.875rem}
.footer-keywords{font-size:0.75rem;color:#6b7280}
.footer-bottom{text-align:center;padding-top:20px;border-top:1px solid #374151;font-size:0.875rem}
.footer-bottom a{color:#9ca3af}
.footer-bottom a:hover{color:#fff}
@media(max-width:900px){
.tool-panel{grid-template-columns:1fr}
.panel-left{order:2}
.panel-right{order:1}
.color-grid{grid-template-columns:repeat(5,1fr)}
.device-info .info-grid{grid-template-columns:repeat(2,1fr)}
.resolution-control{flex-wrap:wrap}
.resolution-select{flex:1 1 100%}
.knowledge-grid{grid-template-columns:1fr}
.scenario-grid,.device-grid{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:600px){
.header .container{flex-direction:column;height:auto;padding:10px 16px;gap:8px}
.nav{gap:12px;flex-wrap:wrap;justify-content:center;font-size:0.875rem}
.color-grid{grid-template-columns:repeat(4,1fr)}
.action-buttons{flex-direction:column}
.device-info .info-grid{grid-template-columns:repeat(2,1fr)}
.scenario-grid,.device-grid{grid-template-columns:1fr}
}