#hero{
                position: relative;
                height:calc(100vh - 100px);
                width: 100%;
                overflow: hidden;
                display: flex;
                justify-content: center;
                align-items: center;
                padding: 30px;

                
                
            }

            #hero-video{
                position: absolute;
                top: 0;
                left: 0;

                width: 100%;
                height: 100%;
                object-fit: cover;

                z-index: 0;
                filter: brightness(0.8);
            }

            .hero-overlay{
                position: absolute;
                left: 0;
                top: 0;

                width: 100%;
                height: 100%;

                background: rgba(0,0,0,0.3);

                z-index: 1;
            }

            .hero-content{
                position: relative;
                
                text-align: center;
                color: wheat;

                z-index: 2;
                transform: translateY(30px);

                transition: all 0.4s ease-in-out;
                opacity: 0;
            }

            #hero-title{
                font-size: 50px;
                font-weight: bold;
                margin-bottom: 20px;
            }

            #hero-subtitle{
                font-size: 24px;
                font-weight: 400;
                margin-bottom: 40px;
            }

            #scroll-button{
                all: unset; /* 🔥 一行搞定：清除所有默认样式 */
                display: block;
                
                width: 0;
                height: 0;
                margin: 20px auto 0;
                
                border-top:40px solid brown;
                border-left:32px solid transparent;
                border-right: 32px solid transparent;

                animation: bounce 2s infinite;
                cursor: pointer;
            }

            @keyframes bounce{
                0%,100%{
                    transform: translateY(0);
                }

                50%{
                    transform: translateY(10px);
                }
            }

            #hero-audio-toggle{
                position: absolute;
                top: 20px;
                right:20px;
                z-index: 2;

                color: white;

                font-size: 24px;

                cursor: pointer;
            }



            .hero-content.show{
                opacity: 1;
                transform: translateY(0);
            }

            /*phone layout for the hero section*/
            @media (max-width:768px) {
                #hero{
                    padding: 15px;
                }
            }

            .hero-particles{
                position: absolute;
                top: 0;
                left: 0;
                width: 100%;
                height: 100%;

                overflow: hidden;
                z-index: 1.5;
                pointer-events: none;
            }

            .particle{
                position: absolute;
                height: 10px;
                width: 10px;
                filter: brightness(5);
                background: radial-gradient(gold, rgba(255,255,255,0));
                border-radius: 50%;
                opacity: 0.5;
                animation: floatParticle 10s infinite ease-in-out;
            }

            @keyframes floatParticle {
                0% {
                    transform: translateY(0) translateX(0);
                    opacity: 0.4;
                }
                50% {
                    transform: translateY(-30px) translateX(20px);
                    opacity: 0.9;
                }
                100% {
                    transform: translateY(0) translateX(0);
                    opacity: 0.4;
                }
            }


            .hero-rays{
                position: absolute;
                top: 0;
                height: 0;
                width: 100%;
                height: 100%;
                overflow: hidden;
                pointer-events: none;
                z-index: 1.7;
            }
            
            .ray{
                position: absolute;
                width: 100px;
                height: 150%;
                top:-20%;

                background: linear-gradient(to bottom,rgba(255, 255, 255, 0.5),rgba(255, 255, 255, 0.25));
                transform: rotate(5deg);
                filter: blur(10px);
                animation: driftRay 12s linear infinite alternate;
                opacity: 0.2;
            }

            .ray:nth-child(1){
                left:10%;
                animation-delay: 0s;
                transform: rotate(2deg);
            }

            .ray:nth-child(2){
                left:30%;
                animation-delay: 2s;
                transform: rotate(-3deg);
            }

            .ray:nth-child(3){
                left:70%;
                animation-delay: 4s;
                transform: rotate(1.5deg);
            }

            @keyframes driftRay{
                0%{
                    transform: translateY(0) scaleY(1.2);
                    opacity: 0.3;
                }

                100%{
                    transform: translateY(30px) scaleY(1.2);
                    opacity: 0.6;
                }
            }

            





            /*mission part*/

            #mission{
                width: 100%;
                height: 30vh;
                display: flex;
                align-items: center;
                justify-content: center;
                background-color: antiquewhite;
                border-bottom: 20px solid wheat;
                border-top: wheat 20px solid;

                padding: 30px;
            }

            #mission-title{
                font-size:40px;
                color: brown;
                text-align: center;
            }

            #mission-text{
                font-size:24px;
                color: brown;
                text-align: center;
            }

            /*phone layout for the mission part*/
            @media (max-width:768px) {
                #mission{
                    height: 40vh;
                    padding: 15px;
                }
            }



            /*brief intro part*/

            #brief-intro{
            
                height: auto;
                display: flex;
                align-items: center;
                justify-content: center;
                gap: 30px;
                border-radius: 12px;

                margin: 30px;
                padding: 30px;

                background-color: beige;
                box-shadow: 0 4px 8px rgba(0,0,0,0.2);
            }

            #intro-box{
                background-color: wheat;
                color: black;
                border-radius: 12px;
                box-shadow: 0 8px 15px rgba(0,0,0,0.4);

                padding: 25px;
            }

            #intro-title, #intro-text{
                text-align: center;
            }

            #intro-title{
                font-size: 36px;
                font-weight: bold;
                margin-bottom: 20px;
            }

            #intro-text{
                font-size: 20px;
                font-weight: 400;

                line-height: 1.7;
            }

            #brief-intro img{
                object-fit: cover;
                border-radius: 12px;
                box-shadow: 0 8px 15px rgba(0,0,0,0.4);
                width: 40%;
            }

            /*phone layout for the intro part*/
            @media (max-width:768px) {
                #brief-intro{
                    flex-direction: column-reverse;
                    margin: 15px 0;
                }

                #brief-intro img{
                    width: 100%;
                }

                #intro-title{
                    font-size:24px;
                    margin-bottom: 15px;
                }

                #intro-text{
                    text-align: unset;
                    line-height: 1.4;
                }
            }






            /*function part*/

            #Main-functions, #Other-functions, #Journal{
                display: flex;
                align-items: center;
                justify-content: center;
                margin: 30px;
                padding: 30px;
                gap: 30px;
                box-shadow: 0 4px 8px rgba(0,0,0,0.2);
                border-radius: 12px;
                background-color: goldenrod;

            }

            .function-item{
                width: 30%;
                height: 300px;
                border-radius: 12px;
                box-shadow: 0 4px 8px rgba(0,0,0,0.4);
                background-color: wheat;
                padding: 25px;

                display: flex;
                align-items: center;
                justify-content: center;
                text-align: center;

                background-position: center;
                background-size: cover;

                color: white;
                font-weight: bold;

                transition: all 0.4s ease-in-out;
            }

            .item-title{
                color: wheat;
                font-size: 36px;
                text-shadow: 0 4px 8px rgba(0,0,0,0.6);
            }

            .function-item:hover{
                transform: scale(1.05);
                box-shadow: 0 12px 24px rgba(0,0,0,0.5);
            }

            /*phone layout for the function part*/
            @media(max-width:768px) {
                #Main-functions, #Other-functions, #Journal{
                    flex-direction: column;
                    
                    margin: 20px 0;
                    padding: 15px;
                }

                .function-item{
                    width: 100%;
                    height: fit-content;
                    padding: 20px;
                }

                .function-item:active{
                    transform: scale(1.2);
                    box-shadow: 0 12px 24px rgba(0,0,0,0.5);
                }

                .item-title{
                    font-size: 24px;
                }
            }



            /*footer part*/

            .floating-arrow{
          height: 0;
          width: 0;
          border-left: 16px solid transparent;
          border-right: 16px solid transparent;

          border-top: 20px solid orange;
          margin: 20px auto 0;

          animation: floatArrow 1.5s infinite ease-in-out;
        }

        @keyframes floatArrow {
          0%, 100%{transform: translateY(0); opacity: 1}
          50% {transform: translateY(10px); opacity: 0.5;}
        }

        .intro-callout {
          background: linear-gradient(to bottom, #fff7e6, #ffeccc);
          padding: 24px 32px;
          border-radius: 16px;
          text-align: center;
          font-size: 20px;
          color: #333;
          box-shadow: 0 8px 16px rgba(0,0,0,0.2);
          max-width: 600px;
          margin: 20px auto;
        }

        #adopt-section{
          display: flex;
          justify-content: center;
        }

        .adopt-button {
          display: inline-block;
          margin: 10px auto;
          padding: 16px 32px;
          background-color: #ffa500;
          color: white;
          font-weight: bold;
          font-size: 18px;
          border-radius: 12px;
          text-decoration: none;
          box-shadow: 0 6px 12px rgba(0,0,0,0.2);
          transition: all 0.3s ease;
        }

        .adopt-button:hover {
          background-color: #ff8800;
          transform: translateY(-5px);
        
        }

        #want_adopt{
          background-image: url("/Image_about/tiandi.jpg");
          width: 100%;
          height: 800px;
          display: flex;
          align-items: center;
          justify-content: center;
          box-sizing: cover;
          background-position: center;
          border-top: #ff8800 solid 10px;
        }

        footer {
            text-align: center;
            margin-top: 30px;
            color: #888;
            font-size: 14px;
            margin-bottom:30px;
        }