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

    /* Spacing */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-xxl: 64px;
}

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

html {
    font-size: 62.5%;
}

.container-xl {
    max-width: 128.0rem;
    margin: 0 auto;
    padding-left: 2.4rem;
    padding-right: 2.4rem;
}

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

body {
    font-size: 1.6rem;
    line-height: 1.6;
    font-family: sans-serif;
}

main {
    padding-top: 6.4rem;
    padding-bottom: 6.4rem;
}

section {
}

h1 {
    font-size: 3.6rem;
    font-family: serif;
}

h2 {
    font-size: 2.8rem;
    font-family: serif;
    margin-bottom: 1.6rem;
    margin-top: 6.4rem;
}

h3 {
    font-size: 2.2rem;
    font-family: serif;
    margin-bottom: 1.6rem;
    margin-top: 3.2rem;
}

p {
    font-size: 1.6rem;
    margin-bottom: 1.6rem;
    font-family: sans-serif;
}

a {
    color: #4CAF50;
}

ul {
    margin-left: 3.2rem;
}

li {
    margin-bottom: 1rem;
}

dt {
    font-weight: 700;
    /* color: #2E7D32; */
    margin-bottom: 0.8rem;
}

dd {
    color: #333333;
    background-color: #fafafa;
    padding: 1rem 1.5rem;
    margin-bottom: 1.6rem;
}

img {
    width: 100%;
    display: block;
    margin-bottom: 1.6rem;
}

.medical-disclaimer {
    background-color: #fff1f1;
    padding: 2rem 3rem;

}

table {
    border-collapse: collapse;
}

table, th, td {
    border: 1px solid black;
    text-align: left;
    padding: 0.8rem 1.6rem;
}

/*********************************************/
/* header..............................[hdr] */
/*********************************************/
header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) var(--space-lg);
    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;
}

.main-nav .nav-links {
    display: flex;
    gap: var(--space-lg);
    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: var(--space-md) var(--space-lg);
        gap: var(--space-md);
        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);
    padding-top: 2.4rem;
    padding-bottom: 2.4rem;
}

footer span {
    color: white;
}

/**********************************************
HUB
**********************************************/

.hub {
    max-width: 1440px;
    margin: 0 auto;
    padding: 0 1rem;
    display: grid;
    grid-template-columns: 240px minmax(0, 1fr) 200px;
    gap: 4rem;
}

.hub .nav-global {
  grid-column: 1;
  position: sticky;
  top: 146px;
}