.main_container {
    margin: 2rem;
    background: #ffffff;
    border-radius: 2rem;
    box-shadow: 0 20px 35px -12px rgba(0, 0, 0, 0.08);
    padding: 2rem;
    position: relative;
    min-height: calc(100vh - 5rem - 7rem - 3rem);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
}
.main_container_title {
    font-size: 1.9rem;
    font-weight: 600;
    letter-spacing: -0.01em;
    color: #0f172a;
    text-align: center;
    margin-bottom: 1.8rem;
}
.main_container_content {
    font-size: 1rem;
    line-height: 1.5;
    color: #1e293b;
    max-width: 600px;
    margin: 0 auto 2rem auto;
    white-space: pre-line;
}
.main_container_start {
    background: #4f46e5;
    color: white;
    border: none;
    padding: 0.7rem 1.8rem;
    border-radius: 2rem;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.2s, transform 0.1s;
    font-family: inherit;
    display: inline-block;
    text-decoration: none;
    text-align: center;
}
.main_container_start:hover {
    background: #4338ca;
}
.main_container_start:active {
    transform: scale(0.97);
}
@media (max-width: 768px) {
    .main_container {
        margin: 1rem;
        min-height: calc(100vh - 4rem - 5rem - 5.5rem);
        padding: 1.5rem;
    }
    .main_container_title {
        font-size: 1.6rem;
        margin-bottom: 1.4rem;
    }
    .main_container_content {
        font-size: 0.95rem;
        margin-bottom: 1.5rem;
    }
    .main_container_start {
        padding: 0.5rem 1.2rem;
        font-size: 0.85rem;
    }
}
@media (max-width: 480px) {
    .main_container {
        margin: 0.5rem;
        min-height: calc(100vh - 4rem - 5rem - 2.3rem);
        padding: 1rem;
    }
    .main_container_title {
        font-size: 1.4rem;
    }
    .main_container_content {
        font-size: 0.9rem;
    }
}