body, html {
    margin: 0;
    padding: 0;
    background: linear-gradient(135deg, #D1E2F5, #E8F0F9);
    color: #2D3748;
    font-family: 'Roboto', 'Noto Sans JP', sans-serif;
    min-height: 100vh;
    scrollbar-width: none;
}

body::-webkit-scrollbar {
    display: none;
}

header {
    background: rgba(74, 144, 226, 0.85);
    backdrop-filter: blur(5px);
    padding: 30px;
    text-align: center;
    color: #fff;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

header h1 {
    font-size: 1.8em;
    font-weight: 600;
    margin: 0;
    letter-spacing: 0.04em;
    color: rgba(255, 255, 255, 0.95);
}

.container {
    max-width: 600px;
    margin: 50px auto;
    padding: 0 25px;
}

#linkList {
    display: flex;
    flex-direction: column;
    gap: 15px;
    list-style: none;
    padding: 0;
}

#linkList li {
    display: flex;
}

#linkList li a {
    text-decoration: none;
    color: #2C5282;
    background: rgba(255, 255, 255, 0.85);
    border-radius: 16px;
    padding: 22px 28px;
    display: flex;
    align-items: center;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-size: 1.02em;
    letter-spacing: 0.02em;
    border: 1px solid rgba(255, 255, 255, 0.9);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.03);
    font-weight: 500;
    width: 100%;
}

.icon {
    width: 22px;
    height: 22px;
    margin-right: 24px;
    opacity: 0.85;
    transition: all 0.4s ease;
}

#linkList li a:hover {
    transform: translateY(-3px) scale(1.01);
    background: rgba(255, 255, 255, 0.95);
    box-shadow: 0 8px 25px rgba(74, 144, 226, 0.15);
    color: #1A365D;
}

#linkList li a:active {
    transform: translateY(-1px);
    transition: all 0.1s;
}

.back-link {
    display: inline-block;
    margin: 20px 0;
    color: #2C5282;
    text-decoration: none;
    font-size: 0.9em;
    opacity: 0.8;
    transition: opacity 0.3s ease;
}

.back-link:hover {
    opacity: 1;
}

.footer {
    text-align: center;
    padding: 20px;
    margin-top: 40px;
    color: #2C5282;
    font-size: 0.85em;
    opacity: 0.8;
    border-top: 1px solid rgba(74, 144, 226, 0.1);
}

@media (max-width: 768px) {
    .container {
        margin: 40px auto;
    }
    
    #linkList li a {
        padding: 15px 20px;
    }
    
    .footer {
        margin-top: 30px;
        padding: 15px;
    }
}