   <style>
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            background-color: #000;
            overflow-x: hidden;
            margin: 0;
        }

        #top-page {
            background-color: #000;
            height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            position: relative;
        }

        #second-page {
            background-color: #1a1a1a;
            min-height: 100vh;
            padding: 100px 20px;
            display: flex;
            justify-content: center;
            align-items: center;
        }

        .second-page-wrapper {
            max-width: 1000px;
            width: 100%;
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 40px;
        }

        .col {
            flex: 0 1 calc(50% - 20px);
            max-width: 560px;
        }

        .container-edge {
            text-align: center;
        }

        .container-edge img {
            width: 450px;
            height: auto;
            display: block;
            transition: transform 0.3s ease;
        }

        .container-edge img:hover {
            transform: scale(1.05);
        }

        .container-edge p {
            margin-top: 15px;
            font-size: 32px;
            letter-spacing: 2px; 
            font-weight: bold;
            color: #fff;
           font-family: 'Anton', sans-serif;
  　　  }

        .container img {
            width: 100%;
            height: auto;
            display: block;
        }

        @media (max-width: 768px) {
            .col {
                flex: 0 1 100%;
                max-width: 100%;
            }
            
            .container-edge img {
                width: 100%;
                max-width: 450px;
            }
        }

        #scroll-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background-color: #333;
            color: #fff;
            border: none;
            border-radius: 50%;
            cursor: pointer;
            display: flex;
            justify-content: center;
            align-items: center;
            font-size: 24px;
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
            transition: all 0.3s ease;
            z-index: 1000;
            opacity: 0;
            visibility: hidden;
            transform: translateY(20px);
        }

        #scroll-to-top.show {
            opacity: 1;
            visibility: visible;
            transform: translateY(0);
        }

        #scroll-to-top:hover {
            background-color: #555;
            transform: translateY(-5px);
            box-shadow: 0 6px 8px rgba(0, 0, 0, 0.4);
        }

        #button-lightning-container {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            pointer-events: none;
            z-index: 999;
        }

        .button-lightning {
            position: absolute;
            top: 0;
            stroke: #ffff00;
            stroke-width: 3;
            fill: none;
            filter: drop-shadow(0 0 8px rgba(255, 255, 0, 1)) 
                    drop-shadow(0 0 15px rgba(255, 255, 0, 0.8))
                    drop-shadow(0 0 25px rgba(255, 255, 0, 0.6));
            animation: flash 0.2s linear forwards;
            opacity: 0;
        }

        #hamburger-menu {
            position: fixed;
            top: 30px;
            right: 30px;
            width: 40px;
            height: 40px;
            cursor: pointer;
            z-index: 2000;
            display: flex;
            flex-direction: column;
            justify-content: space-around;
            padding: 8px 0;
        }

        #hamburger-menu span {
            display: block;
            width: 100%;
            height: 3px;
            background-color: #fff;
            transition: all 0.3s ease;
        }

        #hamburger-menu.open span:nth-child(1) {
            transform: rotate(45deg) translate(8px, 8px);
        }

        #hamburger-menu.open span:nth-child(2) {
            opacity: 0;
        }

        #hamburger-menu.open span:nth-child(3) {
            transform: rotate(-45deg) translate(8px, -8px);
        }

        #side-menu {
            position: fixed;
            top: 0;
            right: -40%;
            width: 40%;
            height: 100vh;
            background-color: #000;
            z-index: 1500;
            transition: right 0.4s ease;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            gap: 40px;
        }

    #side-menu {
    background-color: rgba(0, 0, 0, 0.5);
}

        #side-menu.open {
            right: 0;
        }

    #side-menu a {
    color: #fff;
    text-decoration: none;
    font-size: 28px;
    font-weight: bold;
    transition: color 0.3s ease;
    font-family: 'Anton', sans-serif;

}


        #side-menu a:hover {
            color: #ffff00;
        }

        #menu-overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100vh;
            background-color: rgba(0, 0, 0, 0.5);
            z-index: 1400;
            opacity: 0;
            visibility: hidden;
            transition: all 0.4s ease;
        }

        #menu-overlay.open {
            opacity: 1;
            visibility: visible;
        }

        @media (max-width: 768px) {
            #side-menu {
                width: 70%;
                right: -70%;
            }
        }

        #scroll-to-top svg {
            width: 24px;
            height: 24px;
            fill: #fff;
        }

        #third-page {
            background-color: #808080;
            min-height: 100vh;
            padding: 50px;
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            align-items: center;
            gap: 40px;
        }

        #fourth-page {
            background-color: #000;
            min-height:25vh;
            padding: 0;
            color: #fff;
            display: flex;
            flex-direction: column;
            justify-content: flex-end;
        }

        .footer_index {
            width: 100%;
            padding: 100px;
            text-align: center;
            font-family: 'Anton', sans-serif;
          }

        .footer-logo {
         font-size: 1.8em;
         font-weight: bold;
         letter-spacing: 2px;
         margin-bottom: 20px;
         color:  #444;
         font-family: 'Anton', sans-serif;
         white-space: nowrap;
         }


         .footer-copy {
          font-family: 'Noto Sans JP', sans-serif;
          font-size: 0.9em;
          color: #444;
          white-space: nowrap;
          }

        @media (max-width: 768px) {
            .footer_index {
                padding: 50px 20px;
            }
            
            .footer-copy {
                display: inline-block;
            }
        }

        #lightning-container {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100vh;
            pointer-events: none;
            z-index: 1;
        }

        .lightning {
            position: absolute;
            top: 0;
            stroke: #ffff00;
            stroke-width: 3;
            fill: none;
            filter: drop-shadow(0 0 8px rgba(255, 255, 0, 1)) 
                    drop-shadow(0 0 15px rgba(255, 255, 0, 0.8))
                    drop-shadow(0 0 25px rgba(255, 255, 0, 0.6));
            animation: flash 0.2s linear forwards;
            opacity: 0;
        }

        @keyframes flash {
            0% {
                opacity: 0;
            }
            10% {
                opacity: 1;
            }
            50% {
                opacity: 1;
            }
            100% {
                opacity: 0;
            }
        }

        #edge-text {
            font-size: 120px;
            font-weight: bold;
            color: #fff;
            letter-spacing: 20px;
            font-family: 'Anton', sans-serif;
            z-index: 2;
            position: relative;
        }

        .letter {
            display: inline-block;
            opacity: 0;
            transform: translateY(30px);
            animation: fadeInUp 0.8s ease-out forwards;
        }

        .letter:nth-child(1) { animation-delay: 0.2s; }
        .letter:nth-child(2) { animation-delay: 0.4s; }
        .letter:nth-child(3) { animation-delay: 0.6s; }
        .letter:nth-child(4) { animation-delay: 0.8s; }

        @keyframes fadeInUp {
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        @media (max-width: 768px) {
            #edge-text {
                font-size: 60px;
                letter-spacing: 10px;
            }
        }
    </style>
