body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: grey;
    color: #333;
    min-height: 100vh;
}

@keyframes fade-out {
    0% {
        opacity: 1;
    }
    100% {
        opacity: 0;
    }
}

@keyframes fade-in {
    0% {
        opacity: 0;
    }
    100% {
        opacity: 1;
    }
}

body {
    animation: fade-in 0.6s ease-in;
}

.glass-button:active {
    animation: fade-out 0.6s ease-out;
}

.back-button {
    position: absolute;
    top: 20px;
    left: 20px;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    border-radius: 30px;
    padding: 10px 20px;
    color: #333;
    text-decoration: none;
    font-size: 1.2em;
    transition: transform 0.3s ease, background 0.3s ease;
    z-index: 1000;
}

.back-button:hover {
    background: rgba(255, 255, 255, 1);
}

.back-button:active {
    transform: scale(0.95);
}

.home-container {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    height: 100vh;
}

.home-container h1 {
    font-size: 3em;
    margin-bottom: 10px;
    color: #fff;
}

.home-container p {
    font-size: 1.2em;
    color: #fff;
    margin-bottom: 20px;
}

.home-button-container {
    display: flex;
    gap: 15px;
}

.glass-button {
    padding: 15px 30px;
    background: rgba(255, 255, 255, 0.8);
    border-radius: 30px;
    color: #333;
    text-decoration: none;
    font-size: 1.2em;
    transition: transform 0.3s ease, background 0.3s ease;
}

.glass-button:hover {
    background: rgba(255, 255, 255, 1);
}

.glass-button:active {
    transform: scale(0.95);
}

.page-title {
    font-size: 3em;
    text-align: center;
    margin: 20px 0;
    color: #fff;
}

.content-container {
    display: flex;
    padding-top: 80px;
}

.contents {
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    padding: 20px;
    border-radius: 0 10px 10px 0;
    width: 20%;
    max-height: auto;
    overflow-y: auto;
    position: sticky;
    top: 0;
    box-sizing: border-box;
    color: #333;
}

.contents ul {
    list-style: none;
    padding: 0;
}

.contents li {
    margin-bottom: 10px;
}

.contents a {
    color: #333;
    text-decoration: none;
    font-size: 1.1em;
    transition: opacity 0.3s ease-in-out;
}

.contents a:active {
    opacity: 0;
}

.steps {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 10px;
    padding: 0 20px;
    box-sizing: border-box;
}

.step-box {
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    border-radius: 10px;
    padding: 20px;
    width: 100%;
    box-sizing: border-box;
    color: #333;
    min-height: 15cm;
}

.step-box h3 {
    font-size: 1.5em;
}

.steps .step-box {
    margin-bottom: 20px;
}

.guide-title {
    position: absolute;
    top: -50px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 3em;
    color: #fff;
    text-align: center;
    width: 100%;
    padding: 20px 0;
    box-sizing: border-box;
    z-index: 999;
}

.credits-container {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    height: 100vh;
    text-align: center;
}

.credits-title {
    font-size: 3em;
    margin-bottom: 20px;
    color: #fff;
}

.developers {
    display: flex;
    gap: 40px;
}

.developer-profile {
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    border-radius: 15px;
    padding: 20px;
    text-align: center;
    color: #333;
    width: 200px;
}

.developer-profile img {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    margin-bottom: 10px;
}

.developer-profile h4 {
    margin: 10px 0;
    font-size: 1.5em;
}

.developer-profile p {
    font-size: 1.1em;
}