#cover-page {
    height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-color) 100%);
    color: var(--cover-text-color);
    padding: 20px;
    box-sizing: border-box;
}

.container {
    max-width: calc(95vw - 180px);
    margin: 40px auto;
    background-color: var(--container-bg-color);
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 8px 25px var(--container-shadow-color);
    box-sizing: border-box;
}

#footer_bottom {
    text-align: center;
    margin-top: 60px;
    padding-top: 30px;
    border-top: 1px solid var(--footer-border-color);
    font-size: 1em;
    color: var(--footer-text-color);
}

footer {
    text-align: center;
    margin-top: 60px;
    padding-top: 30px;
    border-top: 1px solid var(--footer-border-color);
    font-size: 1em;
    color: var(--footer-text-color);
}

footer a {
    color: #a5a5a5; 
    text-decoration: none;
    transition: color 0.3s ease;
}

footer a:hover {
    color: #ebebeb;
}



.inter-chapter-cover {
    background-color: var(--primary-color);
    color: var(--cover-text-color);
    padding: 60px 20px;
    margin: 80px -40px 50px -40px; 
    text-align: center;
    border-radius: 6px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}
.inter-chapter-cover h2 {
    color: var(--cover-text-color);
    border-bottom: none;
    margin: 0;
    font-size: 2.2em;
}


.container > section.content-section { 
    margin-bottom: 80px;
    padding-bottom: 40px;
    
}

.container > section.content-section:last-of-type { 
     margin-bottom: 20px; 
     padding-bottom: 20px;
}


#cover-page .scroll-down-hint {
    margin-top: 30px;
    font-size: 1em;
    animation: bounce 2s infinite;
}
#cover-page .scroll-down-hint a {
    color: var(--cover-text-color);
    text-decoration: none;
    padding: 10px 20px;
    border: 1px solid var(--cover-scroll-border-color);
    border-radius: 20px;
    transition: background-color 0.3s, color 0.3s;
}
 #cover-page .scroll-down-hint a:hover {
    background-color: var(--cover-text-color);
    color: var(--primary-color);
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {transform: translateY(0);}
    40% {transform: translateY(-10px);}
    60% {transform: translateY(-5px);}
}



@media (max-width: 720px) {
    .container {
        max-width: calc(85%);
        margin: 0 auto;
        background-color: var(--container-bg-color);
        padding: 15px;
        border-radius: 12px;
        box-shadow: 0 8px 25px var(--container-shadow-color);        
        box-sizing: border-box;
        overflow-x: hidden;
    }
}