:root {
    --color-carbon-powder: #101211;
    --color-white-whisper: #f7f6f2;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 62.5%;
}

body {
    font-size: 1.8rem;
    line-height: 1.6;
    font-family: sans-serif;
    color: #333;
}

.container-xl {
    max-width: 128.0rem;
    margin: 0 auto;
    padding-left: 1.6rem;
    padding-right: 1.6rem;
}

.container-lg {
    max-width: 99.2rem;
    margin: 0 auto;
    padding-left: 1.6rem;
    padding-right: 1.6rem;
}

.container-md {
    max-width: 76.8rem;
    margin: 0 auto;
    padding-left: 1.6rem;
    padding-right: 1.6rem;
}

/*********************************************/
/* ARTICLE */
/*********************************************/
.article {
    max-width: 76.8rem;
    margin: 0 auto;
    padding-left: 1.6rem;
    padding-right: 1.6rem;
    padding-top: 6.4rem;
    padding-bottom: 6.4rem;
}

.article h1 {
    font-size: 4.8rem;
    line-height: 1.1;
    margin-bottom: 1.6rem;
    color: var(--color-carbon-powder);
}

.article h2 {
    font-size: 3.2rem;
    line-height: 1.3;
    margin-top: 6.4rem;
    margin-bottom: 1.6rem;
    color: var(--color-carbon-powder);
}

.article p {
    margin-bottom: 1.6rem;
}

.article table {
    border-collapse: collapse;
    width: 100%;
    text-align: left;
    font-size: 1.6rem;
}

.article th {
    border: 1px solid #333;
    padding: 1.6rem;
    background-color: var(--color-carbon-powder);
    color: var(--color-white-whisper);
    font-weight: 400;
    text-transform: uppercase;
}

.article td {
    border: 1px solid #333;
    padding: 1.6rem;
}

/*********************************************/
/* header..............................[hdr] */
/*********************************************/
header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 24px;
    background-color: #ffffff;
    /* clean white */
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    position: sticky;
    top: 0;
    z-index: 1000;
}

header .logo img {
    height: 50px;
    width: auto;
    display: block;
}

header ul {
    margin: 0;
}

header li {
    margin-bottom: 0;
}

.main-nav .nav-links {
    display: flex;
    gap: 24px;
    list-style: none;
}

.main-nav .nav-links li a {
    font-weight: 500;
    font-size: 16px;
    color: var(--color-neutral-dark);
    text-decoration: none;
    transition: color 0.2s ease;
}

.main-nav .nav-links li a:hover,
.main-nav .nav-links li a:focus {
    color: var(--color-primary);
    outline: none;
}

#nav-toggle {
    display: none;
    /* hidden checkbox */
}

.hamburger {
    display: none;
    /* hidden on desktop */
    flex-direction: column;
    justify-content: space-between;
    width: 25px;
    height: 20px;
    cursor: pointer;
    padding: 0;
}

.hamburger span {
    display: block;
    height: 3px;
    width: 100%;
    background-color: #333;
    border-radius: 2px;
    transition: 0.3s;
}

@media (max-width: 1024px) {

    .hamburger {
        display: flex;
        cursor: pointer;
    }

    .main-nav .nav-links {
        display: none;
        /* hidden by default */
        position: absolute;
        top: 100%;
        /* below header */
        right: 0;
        width: 100%;
        background-color: #ffffff;
        flex-direction: column;
        padding: 16px 24px;
        gap: 16px;
        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    }

    /* Use general sibling combinator ~ instead of + */
    #nav-toggle:checked~.main-nav .nav-links {
        display: flex;
    }
}

/*********************************************/
/* footer..............................[ftr] */
/*********************************************/
footer {
    background-color: var(--color-carbon-powder);
    margin: 0 auto;
    padding-top: 2.4rem;
    padding-bottom: 2.4rem;
    padding-left: 1.6rem;
    padding-right: 1.6rem;
}

footer span {
    color: var(--color-white-whisper);
}