:root {
  --clr-primary-red: hsl(7, 99%, 70%);
  --clr-primary-yellow: hsl(51, 100%, 49%);
  --clr-primary-cyan-dark: hsl(167, 40%, 24%);
  --clr-primary-blue-dark: hsl(198, 62%, 26%);
  --clr-primary-cyan-footer: hsl(
    168,
    34%,
    41%
  ); 

  --clr-neutral-desaturated-blue-dark: hsl(212, 27%, 19%); 
  --clr-neutral-grayish-blue-dark: hsl(213, 9%, 39%); 
  --clr-neutral-grayish-blue: hsl(232, 10%, 55%);
  --clr-neutral-grayish-blue-light: hsl(210, 4%, 67%); 
  --clr-neutral-white: hsl(0, 100%, 100%);

  --ff-sans: "Barlow", sans-serif;
  --ff-serif: "Fraunces", serif;

  --fw-600: 600;
  --fw-700: 700;
  --fw-900: 900;
}

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

* {
  margin: 0;
  padding: 0;
  font: inherit;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--ff-sans);
  font-size: 18px;
  color: var(--clr-neutral-grayish-blue-dark);
  line-height: 1.6;
  background-color: var(--clr-neutral-white);
  min-height: 100vh;
}

img,
picture,
svg,
video {
  display: block;
  max-width: 100%;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--ff-serif);
  font-weight: var(--fw-900);
  color: var(--clr-neutral-desaturated-blue-dark);
  line-height: 1.1;
}

ul {
  list-style: none;
}

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

.container {
  max-width: 1440px;
  margin-inline: auto;
}

.text-center {
  text-align: center;
}
.uppercase {
  text-transform: uppercase;
}

.header {
  position: fixed;
  top: 0;
  width: 100%;
  padding: 1.5rem 1.5rem; 
  z-index: 100;
  transition: background-color 0.3s ease;
}

.header.scrolled {
  padding-top: 1rem;
  padding-bottom: 1rem;
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-toggle {
  display: none;
  cursor: pointer;
}

.nav-list {
  display: flex;
  gap: 3rem;
  align-items: center;
}

.nav-link {
  color: var(--clr-neutral-white);
  font-size: 1.125rem;
  font-family: var(--ff-sans); 
  padding: 0.75rem 1.5rem; 
  border-radius: 2rem;
  transition: all 0.3s ease;
  text-decoration: none;
}

.nav-link:hover {
  background-color: hsla(0, 100%, 100%, 0.1); 
  color: var(--clr-neutral-white);
}
.nav-link.active {
  background-color: var(--clr-neutral-white);
  color: var(--clr-neutral-desaturated-blue-dark); 
  font-family: var(--ff-serif); 
  font-weight: 700;
  text-transform: uppercase; 
  font-size: 0.9rem; 
  padding: 1rem 2rem; 
}

.btn-yellow {
  background-color: var(--clr-primary-yellow);
  color: var(--clr-neutral-desaturated-blue-dark);
}
.hero {
  background-image: url("./images/mobile/image-header.jpg");
  background-size: cover;
  background-position: center bottom;
  background-repeat: no-repeat;
  min-height: 100vh; 
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding-bottom: 20vh; 
  padding-inline: 1rem;
}

.hero h1 {
  font-size: 3rem;
  letter-spacing: 0.5rem;
  color: var(--clr-neutral-white);
  margin-bottom: 4rem;
  text-transform: uppercase;
}

.arrow-down {
  animation: bounce 2s infinite;
}

@keyframes bounce {
  0%,
  20%,
  50%,
  80%,
  100% {
    transform: translateY(0);
  }
  40% {
    transform: translateY(-20px);
  }
  60% {
    transform: translateY(-10px);
  }
}

.grid-section {
  display: grid;
  grid-template-columns: 1fr;
}

.grid-item {
  min-height: 400px; 
  display: flex; 
}

.grid-content {
  padding: 4rem 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
}

.grid-content h2 {
  font-size: 2rem;
  margin-bottom: 1.5rem;
}

.grid-content p {
  color: var(--clr-neutral-grayish-blue-dark);
  margin-bottom: 2rem;
  max-width: 45ch;
}

.learn-more {
  font-family: var(--ff-serif);
  font-weight: var(--fw-900);
  text-transform: uppercase;
  color: var(--clr-neutral-desaturated-blue-dark);
  position: relative;
  z-index: 1;
}

.learn-more::after {
  content: "";
  position: absolute;
  bottom: 0px;
  left: -5px;
  right: -5px;
  height: 10px;
  border-radius: 5px;
  opacity: 0.3;
  z-index: -1;
  transition: opacity 0.3s ease;
}

.learn-more:hover::after {
  opacity: 1;
}

.learn-more.yellow::after {
  background-color: var(--clr-primary-yellow);
}
.learn-more.red::after {
  background-color: var(--clr-primary-red);
}

.grid-image {
  width: 100%;
  height: auto;
  min-height: 300px; 
}

.grid-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.graphic-design,
.photography {
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  aspect-ratio: 375/600; 
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding-bottom: 3.5rem;
  text-align: center;
}

.graphic-design {
  background-image: url("./images/mobile/image-graphic-design.jpg");
  color: var(--clr-primary-cyan-dark);
}

.photography {
  background-image: url("./images/mobile/image-photography.jpg");
  color: var(--clr-primary-blue-dark);
}

.overlay-content h2 {
  font-size: 1.75rem;
  margin-bottom: 1.5rem;
  color: inherit;
}

.overlay-content p {
  max-width: 35ch;
  margin-inline: auto;
  font-size: 1rem;
  line-height: 1.7;
}

.testimonials {
  padding: 4rem 1.5rem;
  text-align: center;
  color: var(--clr-neutral-grayish-blue-dark);
}

.testimonials h3 {
  color: var(--clr-neutral-grayish-blue-light);
  font-family: var(--ff-serif);
  font-weight: var(--fw-900);
  text-transform: uppercase;
  letter-spacing: 0.2rem;
  margin-bottom: 4rem;
  font-size: 1rem;
}

.testimonials-grid {
  display: flex;
  flex-direction: column;
  gap: 4rem;
}

.testimonial-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2rem;
}

.client-img {
  width: 72px;
  height: 72px;
  border-radius: 50%;
}

.testimonial-text {
  color: var(--clr-neutral-desaturated-blue-dark); 
  color: var(--clr-neutral-grayish-blue-dark);
  line-height: 1.8;
  max-width: 35ch;
}

.client-info h4 {
  font-size: 1.125rem;
  margin-bottom: 0.5rem;
  color: var(--clr-neutral-desaturated-blue-dark);
}

.client-info span {
  color: var(--clr-neutral-grayish-blue-light);
  font-size: 0.9rem;
}

.gallery {
  display: grid;
  grid-template-columns: 1fr 1fr;
}

.gallery img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}


.footer {
  background-color: var(--clr-primary-cyan-footer);
  color: var(--clr-primary-cyan-dark); 
  padding: 4rem 2rem;
  text-align: center;
}

.footer-logo {
  margin-bottom: 2.5rem;
  filter: brightness(0) saturate(100%) invert(32%) sepia(12%) saturate(1637%)
    hue-rotate(118deg) brightness(97%) contrast(92%); 
  width: 170px;
  height: auto;
  margin-inline: auto;
}

.footer-nav {
  display: flex;
  justify-content: center;
  gap: 3rem;
  margin-bottom: 5rem;
}

.footer-nav a {
  color: hsl(167, 40%, 24%); 
  opacity: 0.7;
  transition: opacity 0.3s ease;
  font-family: var(--ff-sans);
  font-weight: 600; 
}

.footer-nav a:hover {
  opacity: 1;
}

.social-links {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
}

.social-links a {
  color: hsl(167, 40%, 24%);
}

.social-links img {
  width: 20px;
  height: 20px;
  filter: brightness(0) saturate(100%) invert(20%) sepia(13%) saturate(1478%) hue-rotate(124deg) brightness(95%) contrast(96%);
  transition: filter 0.3s ease;
}

.social-links a:hover img {
  filter: brightness(0) saturate(100%) invert(100%) sepia(100%) saturate(0%) hue-rotate(288deg) brightness(102%) contrast(102%);
}

.attribution {
  margin-top: 3rem;
  color: white;
}


@media (min-width: 768px) {
  .hero {
    background-image: url("./images/desktop/image-header.jpg");
  }

  .grid-section {
    grid-template-columns: 1fr 1fr;
  }

  .grid-content {
    align-items: flex-start;
    text-align: left;
    padding: 8rem;
  }

  .graphic-design {
    background-image: url("./images/desktop/image-graphic-design.jpg");
    aspect-ratio: unset;
    min-height: 600px;
  }

  .photography {
    background-image: url("./images/desktop/image-photography.jpg");
    aspect-ratio: unset;
    min-height: 600px;
  }

  .testimonials-grid {
    flex-direction: row;
  }

  .gallery {
    grid-template-columns: repeat(4, 1fr);
  }

  .nav-toggle {
    display: none;
  }

  .nav-list {
    display: flex;
    position: static;
    flex-direction: row;
    background: transparent;
    padding: 0;
    width: auto;
    height: auto;
  }

  .nav-link {
    color: var(--clr-neutral-white);
  }
  
  .grid-image {
    height: 100%;
  }
  
  .grid-image picture,
  .grid-image img {
    height: 100%;
    width: 100%;
    object-fit: cover;
  }
}

@media (max-width: 767px) {
  .nav-toggle {
    display: block;
  }

  .nav-list {
    position: absolute;
    top: 6rem;
    left: 1.5rem;
    right: 1.5rem;
    background-color: var(--clr-neutral-white);
    flex-direction: column;
    padding: 2rem;
    gap: 2rem;
    display: none; 
  }

  .nav-list::before {
    content: "";
    position: absolute;
    top: -20px;
    right: 0;
    border-style: solid;
    border-width: 0 0 20px 20px;
    border-color: transparent transparent var(--clr-neutral-white) transparent;
  }

  .nav-list.active {
    display: flex;
  }

  .nav-link {
    color: var(--clr-neutral-grayish-blue-dark);
  }

  .btn-white {
    background-color: var(--clr-primary-yellow);
    color: var(--clr-neutral-desaturated-blue-dark);
  }
  .btn-white:hover {
    background-color: hsl(51, 100%, 40%); 
  }

  .grid-item.order-mobile-first {
    order: -1;
  }
}