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

/* Custom Properties */

:root {
  --ff-primary: 'Source Sans Pro', sans-serif;
  --ff-secondary: 'Source Code Pro', monospace;

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

  --clr-light: #fff;
  --clr-dark: #303030;
  --clr-accent: #c8c8c8;

  --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);
}

@media (min-width: 850px) {
  :root {
    --fs-h1: 3.8rem;
    --fs-h2: 2.8rem;
    --fs-h3: 1.5rem;
    --fs-body: 1.125rem;
  }
}

/* General Styes */

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: 3em 5em;
}

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

/* Typography */

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

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--home {
  font-weight: var(--fw-reg);
}

.section__title--home strong {
  display: block;
}

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

.section__subtitle--home,
.section__subtitle--about,
.section__subtitle--portfolio,
.section__subtitle--tools {
  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;
}

.nav-toggle {
  padding: .5em;
  background: transparent;
  border: 0;
  cursor: pointer;
  position: fixed;
  right: 1em;
  top: 1.5em;
  z-index: 1000;
}

.hamburger {
  display: block;
  position: relative;
}

.hamburger,
.hamburger::before,
.hamburger::after {
  background: var(--clr-accent);
  width: 2em;
  height: 3px;
  border-radius: 1em;
  transition: transform .2s ease-in-out;
}

.hamburger::before,
.hamburger::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
}

.hamburger::before {
  bottom: 10px;
}

.hamburger::after {
  top: 10px;
}

.nav {
  position: fixed;
  background: var(--clr-dark);
  color: var(--clr-light);
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 100;
  transform: translateX(100%);
  transition: transform .2s ease-in-out;
}

.nav__list {
  list-style: none;
  display: flex;
  height: 100%;
  flex-direction: column;
  justify-content: space-evenly;
  align-items: center;
  margin: 0;
  padding: 0;
}

.nav__link {
  color: inherit;
  font-weight: var(--fw-bold);
  font-size: var(--fs-h2);
  text-decoration: none;
}

.nav__link:hover {
  color: var(--clr-accent);
}

.nav-open .nav {
  transform: translateX(0);
}

.nav-open .hamburger {
  transform: rotate(135deg);
}

.nav-open .hamburger::before {
  opacity: 0;
}

.nav-open .hamburger::after {
  transform: rotate(90deg) translateX(-10px);
}

/* Home */

.home {
  position: relative;
}

.home__img {
  box-shadow: var(--bs);
  border-radius: 1em;
  max-width: 60%;
}

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

@media (min-width: 700px) {
  .home {
    display: grid;
    width: min-content;
    margin: 0 auto;
    grid-column-gap: 1em;
    grid-template-areas:
      "img title"
      "img subtitle";
    grid-template-columns: min-content max-content;
  }

  .home__img {
    grid-area: img;
    min-width: 265px;
    position: relative;
    z-index: 2;
  }

  .section__subtitle--home {
    align-self: start;
    grid-column: -1 / 1;
    grid-row: 2;
    text-align: right;
    position: relative;
    left: -1.5em;
    width: calc(100% + 1.5em);
  }
}

/* About */

/* Portfolio */

.portfolio {
  text-align: center;
}

.portfolio__body {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

/* Tools */

.tools__list {
  font-size: var(--fs-h1);
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  list-style: none;
  padding: 0;
}

.tools__item {
  text-align: center;
  width: 120px;
}

/* Footer */

.footer {
  background: #111;
  color: var(--clr-accent);
  text-align: center;
  padding: .5em 0;
  font-size: var(--fs-h3);
}

.footer a {
  color: inherit;
  text-decoration: none;
}

.footer__link:hover,
.social-list__link:hover {
  opacity: .7;
}

.footer__link:hover {
  text-decoration: underline;
}

.social-list {
  list-style: none;
  display: flex;
  justify-content: center;
  padding: 0;
}

.social-list__item {
  margin: 0 .5em;
}

.social-list__link {
  padding: .5em;
}