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

:root {
  --clr-primary: rgba(247, 205, 119, 1);
  --clr-secondary: rgba(247, 205, 119, 0.25);
  
  --clr-dark: rgba(57, 59, 71, 1);
  --clr-mid: rgb(164, 166, 182, 1);
  --clr-light: rgba(251, 247, 238, 1);
  --clr-white: rgb(255, 255, 255);
  
  --clr-gradient: linear-gradient(0deg, rgba(57,59,71,0.2) 0%, rgba(177,167,166,0) 25%);
  
  --fs-h1: 2rem;
  --fs-h2: 1.5rem;
  --fs-h3: 1rem;
  --fs-body: 1rem;
  --fs-card: 0.75rem;
  
  --bs: 0 0.25em 1.25em rgba(0, 0, 0, 0.15),
        0 0.125em 0.25em rgba(0,0,0,.40);
}

@media (min-width:740px) {  
  :root {
    --fs-h1: 2.25rem;
    --fs-h2: 2.15rem;
    --fs-h3: 1.25rem;
    --fs-body: 1.125rem;
    --fs-card: 1rem;
  }
}

/* -------------------- */
html {
  scroll-behavior: smooth;
}

body {
  background: var(--clr-light);
  color: var(--clr-dark);
  margin: 0;
  font-family: 'Inter', sans-serif;
  font-size: var(--fs-body);
  line-height: 1.6;
}

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

h1, h2 ,h3 {
  margin-top: 0;
}

h1 {
  font-weight: 400;
  font-size: var(--fs-h1);
  line-height: 1.4;
}

h2 {font-size: var(--fs-h2);}
h3 {font-size: var(--fs-h3);}
             
p {
  margin: 0 0 1em 0;
}

a {
  text-decoration: none;
}

/* -------------------- */
.section-container {
  padding: 3em 2em;
}

.section-container__intro {
  padding: 5em 2em;
}

.intro {
  background-color: var(--clr-primary);
}

.section-container__about p {
  max-width: 40em;
}

.about__link {
  font-weight: 700;
  color: var(--clr-mid);
  display: inline-block;
  transition: all 0.1s ease-in;
}

.about__link::after {
  content: '';
  width: 0;
  height: 1px;
  display: block;
  background-color: var(--clr-mid);
  transition: all 0.1s ease-in;
}

.about__link:hover {
  color: var(--clr-dark);
}

.about__link:hover::after {
  width: 100%;
  background-color: var(--clr-dark);
}

.work {
  background-color: var(--clr-secondary);
  background-image: url(/img/bg_buffer.png);
  background-repeat: repeat-x;
}

.portfolio {
  margin-top: 2em;
}

.portfolio__item {
  display: block;
  background-color: var(--clr-dark);
  color: var(--clr-light);
  box-shadow: var(--bs);
  margin: 0 0 3em 0;
  border-radius: .5em;
  cursor: pointer;
  
}

.portfolio__item h3 {
  transition: all 250ms linear;
}

.portfolio__item:hover h3 {
  color: var(--clr-primary);
}

.portfolio__item p {
  font-size: var(--fs-card);
  font-weight: 300;
}

.portfolio__filter {
  position: relative;
  border-top-left-radius: .5em;
  border-top-right-radius: .5em;
  background: var(--clr-gradient);
  overflow: hidden;
}

.portfolio__filter:after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: var(--clr-gradient);
}

.portfolio__image {
  opacity: 0.9;
  transform: scale(1.01);
  transition: 
    transform 280ms cubic-bezier(.5, 0, .5, 1),
    opacity 250ms linear;
}

.portfolio__item:hover .portfolio__image {
  transform: scale(1.06);
  opacity: 1;
}

.portfolio__description {
  padding: 1em;
}

.contact {
  background-color: var(--clr-dark);
  color: var(--clr-light);
}

.contact__links {
  display: flex;
  flex-direction: column;
  list-style: none;
  padding: 0;
}

.contact__link {
  display: inline-block;
  color: var(--clr-light);
  fill: var(--clr-light);
  margin: 0.5em 0 2em 0;
  transition: all 0.2s ease-in;
}

.contact__link--mail::after {
  content: '';
  width: 0;
  height: 1px;
  display: block;
  background-color: var(--clr-primary);
  transition: all 0.1s ease-in;
}

.contact__link--mail:hover::after {
  width: 100%;
}

.contact__link--github {
  width: 2.5rem;
}

.contact__link:hover {
  color: var(--clr-primary);
  fill: var(--clr-primary);
}

/* ------------------------- */
@media (min-width:640px) {
  
  .section-container  {
    display: flex;
    flex-direction: column;
    max-width: 1000px;
    margin-left: auto;
    margin-right: auto;
  }
  
  .work {
    background-image: url(/img/bg_buffer_lg.png);
  }
  
  .portfolio {
    display: grid;
    gap: 2em;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  }
}