* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Roboto, sans-serif; 
}

/* all defined variables */
:root {
    --dark-background: #1F2937;
    --main-text-size: 48px;
    --main-text-weight: bold;
    --main-text-color: #F9FAF8;
    --secondary-text-size: 18px;
    --secondary-text-color: #E5E7EB;
    --logo-text-size: 24px;
    --logo-text-color: #F9FAF8;
    --button-color: #3882F6;
    --info-header-text-size: 36px;
    --info-header-text-weight: bold;
    --info-header-text-color: #1F2937;
    --quote-background-color: #E5E7EB;
    --quote-text-size: 36px;
    --quote-text-color: #1F2937;
    --quote-text-style: italic;
}

/* header section */
header {
    background-color: var(--dark-background);
    color: var(--main-text-color);
    display: flex;
    justify-content: center;
}
header .header-container {
    width: 75%;
    padding: 20px 0px;
    display: flex;
}
header .header-container .header-logo {
    flex: 1;
}
header .header-container .header-logo h4 {
    font-size: var(--logo-text-size);
}
header .header-container .header-menu {
    flex: 1;
}
header .header-container .header-menu ul {
    display: flex;
    justify-content: right;
    gap: 20px;
}
header .header-container .header-menu ul li {
    list-style-type: none;
}
header .header-container .header-menu ul li a {
    text-decoration: none;
    color: var(--secondary-text-color);
}
header .header-container .header-menu ul li a:hover {
    text-decoration: underline;
}


/* main section */
/* section 1 */
section.section1 {
    background: var(--dark-background);
    display: flex;
    justify-content: center;
}
section.section1 .section-container {
    width: 75%;
    padding: 70px 0px;
    display: flex;
    justify-content: center;
    gap: 30px;
}
section.section1 .section-container .section1-1 {
    width: 50%;
    display: flex;
    flex-direction: column;
    gap: 15px;
}
section.section1 .section-container .section1-1 .section1-1-title h2 {
    font-size: var(--main-text-size);
    color: var(--main-text-color);
    font-weight: var(--main-text-weight);
}
section.section1 .section-container .section1-1 .section1-1-content p {
    font-size: var(--secondary-text-size);
    color: var(--secondary-text-color);
}
section.section1 .section-container .section1-1 .section1-1-btn button {
    background-color: var(--button-color);
    border: 0px;
    padding: 7px 20px;
    color: var(--secondary-text-color);
    font-weight: var(--info-header-text-weight);
    border-radius: 8px;
    cursor: pointer;
}
section.section1 .section-container .section1-2 {
    width: 50%;
}
section.section1 .section-container .section1-2-img {
    width: 100%;
}
section.section1 .section-container .section1-2-img img {
    width: 100%;
}
/* section 2 */
section.section2 {
    display: flex;
    justify-content: center;
}
section.section2 .section-container {
    width: 65%;
    padding: 70px 0px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 30px;
}
section.section2 .section-container .section2-header h2 {

}
section.section2 .section-container .section2-content {
    display: flex;
    gap: 30px;
}
section.section2 .section-container .section2-content .box {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 10px;
    justify-content: center;
    align-items: center;
}
section.section2 .section-container .section2-content .box .box-box {
    width: 100%;
    height: 150px;
    border: 3px solid var(--button-color);
    border-radius: 5px;
}
section.section2 .section-container .section2-content .box .box-text {
    text-align: center;
    font-size: 14px;
    color: gray;
}
/* section 3 */
section.section3 {
    display: flex;
    justify-content: center;
    background-color: var(--quote-background-color);
}
section.section3 .section-container {
    width: 65%;
    padding: 70px 0px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 10px;
}
section.section3 .section-container .section3-quote p {
    color: var(--quote-text-color);
    font-size: var(--quote-text-size);
    font-style: var(--quote-text-style);
}
section.section3 .section-container .section3-author {
    width: 100%;
}
section.section3 .section-container .section3-author p {
    text-align: right;
    font-weight: bold;
    font-size: 16px;
}
/* section 4 */
section.section4 {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 70px 0px;
}
section.section4 .section-container {
    width: 65%;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 30px;
    background-color: var(--button-color);
    padding: 30px 70px;
    border-radius: 8px;
}
section.section4 .section-container .section4-1 {
    flex: 4;
    display: flex;
    flex-direction: column;
    gap: 5px;
}
section.section4 .section-container .section4-1 h3 {
    color: var(--secondary-text-color);
    font-size: var(--secondary-text-size)
}
section.section4 .section-container .section4-1 p {
    color: var(--secondary-text-color);
    font-size: 14px;
}
section.section4 .section-container .section4-2 {
    flex: 1;
}
section.section4 .section-container .section4-2 button {
    background-color: var(--button-color);
    border: 2px solid var(--secondary-text-color);
    padding: 7px 20px;
    color: var(--secondary-text-color);
    font-weight: var(--info-header-text-weight);
    border-radius: 8px;
    cursor: pointer;
}


/* footer section */
footer {
    background-color: var(--dark-background);
    display: flex;
    justify-content: center;
}
footer .footer-container {
    width: 75%;
    padding: 30px 0px;
    display: flex;
    justify-content: center;
}
footer .footer-container p {
    color: var(--secondary-text-color);
    font-size: 14px;
}