.content {
    width: 90%;
}

.header-image {
    display: block;
    max-height: 200px;
    margin-left: auto;
    margin-right: auto;
}

.standard-content {
    line-height: 1.5;
}

.standard-content h1,
.standard-content h2,
.standard-content h3 {
    text-align: center;
}

.standard-content p {
    text-align: left;
    margin-bottom: 15px;
}

.standard-content a {
    color: #4a98f7;
    text-decoration: underline;
    transition: color 0.3s ease;
}

.standard-content a:hover {
    color: #72b3f9;
}

.intro {
    background-color: #0d4847;
    width: 80%;
    padding: 15px;
    margin: 0 auto;
    margin-bottom: 25px;
    border-radius: 10px;
}

.notice {
    background-color: #11480d;
    color: #333;
    padding: 10px;
    border-radius: 5px;
}

.section-blocks {
    display: flex;
    flex-direction: row;
    justify-content: space-around;
    flex-wrap: wrap;
    margin: 20px 0;
}

.section-blocks div {
    flex: 1 1 calc(33.333% - 20px);
    margin: 10px;
    padding: 10px;
    background-color: #0e486c;
    border-radius: 5px;
}

.content-block {
    margin-bottom: 60px;
}

.centered-block {
    text-align: center;
}

.centered-item {
    display: inline-block;
    max-width: 100%;
    height: auto;
}

.vector-graphics-img {
    width: 300px;
}

.video-container {
    position: relative;
    width: 100%;
    padding-bottom: 56.25%;
    /* 16:9 Aspect Ratio */
    overflow: hidden;
}

.video-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

a h1 {
    color: white;
}

a h1:hover {
    color: rgb(0, 153, 255);
}

.under-construction-content .centered-item {
    transition: opacity 0.5s ease;
}

.under-construction-content .text-box {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: rgb(36, 131, 100);
    color: white;
    padding: 10px;
    font-size: 32px;
    opacity: 0;
    font-weight: bold;
    transition: opacity 0.5s ease;
}

.under-construction-content:hover .centered-item {
    opacity: 0.3;
}

.under-construction-content:hover .text-box {
    opacity: 1;
}

.centered-block .under-construction-content {
    position: relative;
}


@media (max-width: 768px) {
    .standard-content h1 {
        font-size: 1.5em;
    }

    .standard-content h2 {
        font-size: 1.3em;
    }

    .standard-content h3 {
        font-size: 1.2em;
    }

    .section-blocks div {
        flex: 1 1 calc(50% - 20px);
    }

    .section-blocks div:last-child {
        flex: 1 1 100%;
    }
}

/* ===== MOBILE RESPONSIVENESS ===== */

/* Large tablets and small desktops */
@media (max-width: 1024px) {
    .content {
        width: 95%;
    }
    
    .intro {
        width: 90%;
        padding: 12px;
    }
    
    .header-image {
        max-height: 180px;
    }
}

/* Tablets */
@media (max-width: 768px) {
    .content {
        width: 100%;
        padding: 0 10px;
    }
    
    .intro {
        width: 95%;
        padding: 10px;
        margin-bottom: 20px;
    }
    
    .header-image {
        max-height: 160px;
    }
    
    .section-blocks {
        margin: 15px 0;
    }
    
    .section-blocks div {
        flex: 1 1 calc(50% - 15px);
        margin: 8px;
        padding: 8px;
    }
    
    .content-block {
        margin-bottom: 40px;
    }
    
    .under-construction-content .text-box {
        font-size: 24px;
        padding: 8px;
    }
}

/* Mobile phones */
@media (max-width: 480px) {
    .content {
        width: 100%;
        padding: 0 5px;
    }
    
    .intro {
        width: 100%;
        padding: 8px;
        margin-bottom: 15px;
        border-radius: 5px;
    }
    
    .header-image {
        max-height: 140px;
    }
    
    .section-blocks {
        flex-direction: column;
        margin: 10px 0;
    }
    
    .section-blocks div {
        flex: 1 1 100%;
        margin: 5px 0;
        padding: 10px;
    }
    
    .content-block {
        margin-bottom: 30px;
    }
    
    .standard-content p {
        margin-bottom: 12px;
        font-size: 0.95em;
    }
    
    .under-construction-content .text-box {
        font-size: 18px;
        padding: 6px;
    }
    
    .notice {
        padding: 8px;
        font-size: 0.9em;
    }
}

/* Small mobile phones */
@media (max-width: 360px) {
    .intro {
        padding: 6px;
        margin-bottom: 12px;
    }
    
    .header-image {
        max-height: 120px;
    }
    
    .section-blocks div {
        padding: 8px;
    }
    
    .content-block {
        margin-bottom: 25px;
    }
    
    .standard-content p {
        margin-bottom: 10px;
        font-size: 0.9em;
    }
    
    .under-construction-content .text-box {
        font-size: 16px;
        padding: 5px;
    }
    
    .notice {
        padding: 6px;
        font-size: 0.85em;
    }
}