*,
*::before,
*::after {
    box-sizing: border-box;
}

:root {
    --ff-primary: 'Lato';
    --ff-secondary: 'Lato', monospace;

    --fw-reg: 300;
    --fw-bold: 900;

    --clr-light: #fff;
    --clr-dark: #303030;
    --clr-accent: #83cae6;

    --fs-h1: 3rem;
    --fs-h2: 2.25rem;
    --fs-h3: 1.25rem;
    --fs-body: 1rem;
    
    --bs: 0.25em 0.25em 0.75em rgba(0,0,0,.25),
          0.125em 0.125em 0.25em rgba(0,0,0,.15);
}

/* General Global Styling */

html {
    scroll-behavior: smooth;
}

body {
    background: var(--clr-light);
    color: var(--clr-dark);
    margin: 0;
    font-family: var(--ff-primary);
    font-size: var(--fs-body);
    line-height: 1.6;
}

section {
    padding: 1em 2em;
}

img {
    display: block;
    max-width: 100%;
}

strong { font-weight: var(--fw-bold) }

:focus {
    outline: 3px solid var(--clr-accent);
    outline-offset: 3px;
}

/* Typography */
h1,
h2,
h3 {
    line-height: 1;
    margin: 0;
}

h1 { font-size: var(--fs-h1) }
h2 { font-size: var(--fs-h2) }
h3 { font-size: var(--fs-h3) }

.section__title {
    margin-bottom: .25em;
}

.section__title--intro {
    font-weight: var(--fw-reg);
}

.section__subtitle {
    margin: 0;
    font-size: var(--fs-h3);
}

.section__subtitle--intro {
    background: var(--clr-accent);
    padding: .25em 1em;
    font-family: var(--ff-secondary);
    margin-bottom: 1em;
}

/* Header */

header {
    display: flex;
    justify-content: space-between;
    padding: 1em;
}

.logo {
    padding-left: 1em;
    max-width: 350px;
}

/*  Intro Section  */

.intro {
    position: relative;
}

.intro__img {
    box-shadow: var(--bs);
}

.section__subtitle--intro {
    display: inline-block;
}