*{box-sizing:border-box}:root{--bg-color: #f0f2f5;--primary-color: #14487F;--card-bg: #ffffff}body{font-family:Roboto,sans-serif;background-color:var(--bg-color);margin:0;color:#333}.app-header{background-color:var(--primary-color);color:#fff;padding:10px 20px;display:flex;justify-content:space-between;align-items:center}.header-main{display:flex;align-items:center}.header-logo{margin:0}.app-intro{background:#eef4fa;padding:15px 40px 15px 20px;border-radius:8px;box-shadow:0 2px 8px #14487f1a;margin-bottom:20px;border-left:4px solid var(--primary-color);display:flex;align-items:flex-start;gap:15px;position:relative}.app-intro-icon{color:var(--primary-color);display:flex;align-items:center;padding-top:2px;flex-shrink:0}.app-intro-content{flex:1}.app-intro p{margin:0;font-size:.85rem;color:#555;line-height:1.6}.app-intro-close{position:absolute;top:5px;right:8px;background:none;border:none;font-size:1.5rem;color:#999;cursor:pointer;line-height:1;transition:color 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