:root {
  --container-color: #ffffff;
  --text-color: #222222;
  --background-color: #f8f8f8;
  --accent-color: linear-gradient(140deg, #065143, #9ad4d6);
  --accent-color-hovered: linear-gradient(140deg, #03241e, #4f7677);
}
/* --- css reset --- */

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

/* mobile defaults */
body {
  font-family: "Inter", sans-serif;
  line-height: 1.6;
  background-color: var(--background-color);
  color: var(--text-color);
  overflow-x: hidden;
  background: #0d1117;
  background-image: radial-gradient(
      circle at 15% 25%,
      rgba(0, 255, 255, 0.2),
      transparent 30%
    ),
    radial-gradient(
      circle at 85% 75%,
      rgba(131, 56, 236, 0.25),
      transparent 40%
    ),
    radial-gradient(
      ellipse at 50% 50%,
      rgba(0, 123, 255, 0.15),
      transparent 50%
    );
  background-size: 200% 200%;
  animation: moveGradient 60s ease infinite;
  background-attachment: fixed;
}

main {
  color: white;
}

/* --- utility classes --- */
.container {
  width: 90%;
  max-width: 1100px;
  margin: 2rem auto 3rem auto;
  background-color: transparent;
  border-radius: 20px;
  padding: 1rem;
}

.page-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 50;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.overlay-visible {
  opacity: 1;
  visibility: visible;
}

.frosted {
  background-color: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.error-message {
  color: #d93025;
  font-size: 0.9rem;
  display: block;
  min-height: 1rem;
}

h2 {
  font-size: 2rem;
  border-bottom: 1px solid white;
}

/* --- header setup --- */

header {
  display: flex;
  height: 3rem;
  background-color: var(--container-color);
  justify-content: space-between;
  align-items: center;
  padding: 0 10%;
  position: sticky;
  top: 0;
  z-index: 100;
}

/* --- nav setup --- */

.logo a {
  margin: 0;
  font-family: "Pacifico", sans-serif;
  background-image: var(--accent-color);
  color: transparent;
  background-clip: text;
  font-size: clamp(0.7rem, 2vw, 1rem);
}

.logo a:link,
.logo a:visited {
  font-family: "Pacifico", sans-serif;
  background-image: var(--accent-color);
  color: transparent;
  background-clip: text;
  text-decoration: none;
}

.logo a:hover {
  background-image: var(--accent-color-hovered);
}

.hamburger-button {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border-radius: 100%;
  border: none;
  background-color: var(--container-color);
  height: 2.5rem;
  width: 2.5rem;
}
.hamburger-button:hover {
  cursor: pointer;
  background-color: rgba(0, 0, 0, 0.3);
}

.hamburger-span {
  display: block;
  width: 25px;
  height: 3px;
  background-color: var(--text-color);
  margin-bottom: 5px;
}
.hamburger-span:last-child {
  margin-bottom: 0;
}

#bar-1,
#bar-2,
#bar-3 {
  transition: all 0.3s ease;
}

#bar-1.x {
  transform: translateY(0.5rem) rotate(45deg);
}

#bar-2.x {
  opacity: 0;
}

#bar-3.x {
  transform: translateY(-0.5rem) rotate(-45deg);
}

nav {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.nav-list {
  display: flex;
  flex-direction: column;
  align-items: center;
  background-color: var(--container-color);
  height: 100%;
  width: 30%;
  position: fixed;
  top: 3rem;
  right: 0;
  transform: translateX(100%);
  transition: all 0.3s ease;
}

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

.nav-list li {
  list-style-type: none;
  border-bottom: 1px black solid;
  width: 100%;
  height: 3rem;
}

.nav-list a {
  display: flex;
  height: 100%;
  align-items: center;
  justify-content: center;
}

.nav-list a:link,
.nav-list a:visited {
  text-decoration: none;
  color: var(--text-color);
  transition: all 0.3s ease;
}
.nav-list a:hover {
  color: var(--container-color);
  background-color: var(--text-color);
}

/* --- hero section setup --- */

#hero {
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: white;
  background: linear-gradient(45deg, #121212, #2c3e50);
  background-size: 200% 200%;
  animation: moveGradient 5s ease infinite;
}

.hero-content {
  max-width: 800px;
  padding: 0 1rem;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 700;
  margin: 0;
}

.hero-subtitle {
  display: block;
  font-size: 1.5rem;
  font-weight: 400;
  color: #bdc3c7;
  margin-top: 0.5rem;
}

.hero-description {
  font-size: 1.2rem;
  margin: 1.5rem 0 2rem 0;
}

.cta-button {
  display: inline-block;
  background-image: var(--accent-color);
  color: white;
  padding: 1rem 2rem;
  font-size: 1rem;
  font-weight: bold;
  text-decoration: none;
  border-radius: 5px;
  transition: all 0.3s ease;
  border: none;
}

.cta-button:hover {
  background-image: var(--accent-color-hovered);
  transform: translateY(-3px);
}

/* --- about section setup --- */

#about,
#projects,
#skills,
#contact {
  margin: 5rem 0;
}

#about-container-outer {
  display: grid;
  grid-template-columns: 1fr;
  align-items: center;
}

#image-container {
  max-width: 200px;
  margin: 0 auto;
}

#image-container img {
  width: 100%;
  height: auto;
  border-radius: 50%;
}

#about-container h2 {
  margin-bottom: 1rem;
}

/* --- project section setup --- */

#projects-container {
  text-align: center;
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
  width: 90%;
  max-width: 1100px;
  margin: 2rem auto 3rem auto;
}

.project-grid a:link,
.project-grid a:visited {
  text-decoration: none;
  color: var(--text-color);
}

.project-card {
  position: relative;
  overflow: hidden;
  border-radius: 15px;
  text-decoration: none;
  color: white;
  display: block;
  height: 200px;
}

.project-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: all 0.3s ease;
  opacity: 0.3;
}

.project-card:hover .project-image {
  transform: scale(1.05);
  opacity: 0.8;
}

.project-info {
  width: 100%;
  position: absolute;
  bottom: 0;
  padding: 1.5rem 1rem;
  color: white;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.9), transparent);
}

.project-info h3 {
  margin: 0;
  font-size: 1.25rem;
}

/* --- skills section setup --- */

#skills-container {
  text-align: center;
}

#skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 1.5rem;
}

.skill-card {
  padding: 1.5rem;
  border-radius: 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  transition: all 0.3s ease;
}

.skill-card:hover {
  transform: translateY(-5px);
}

.skill-card img {
  height: 50px;
  width: 50px;
  filter: invert(1) brightness(100);
}

.skill-card:hover img {
  filter: none;
}

/*contact form setup*/

#contact-container {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.contact-text {
  display: flex;
  flex-direction: column;
  justify-content: center;
  margin-top: 5rem;
  margin-bottom: 0;
}

.contact-text h2 {
  margin-bottom: 3rem;
}

.contact-text p {
  margin-bottom: 1.5rem;
  font-size: 1.1rem;
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 12px;
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  background: rgba(0, 0, 0, 0.2);
  color: white;
  font-size: 1rem;
}

.contact-link {
  color: #ccc;
  text-decoration: none;
  font-weight: 500;
  display: inline-block;
  margin-bottom: 5rem;
  transition: all 0.3s ease;
}

.contact-link:hover {
  color: white;
}

/* --- footer setup --- */

footer {
  width: 100%;
  background-color: var(--text-color);
  color: #ccc;
  padding: 2rem 1rem;
  text-align: center;
}

.social-links {
  list-style: none;
  padding: 0;
  margin: 0 0 1rem 0;
  display: flex;
  justify-content: center;
  gap: 1.5rem;
}

footer a {
  color: #ccc;
}

.copyright-text {
  font-size: 0.9rem;
  margin: 0;
}

/*gradient moving animation*/

@keyframes moveGradient {
  0% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 0% 50%;
  }
}

/*media for desktop*/

@media (min-width: 768px) {
  .hamburger-button {
    display: none;
  }
  .nav-list {
    flex-direction: row;
    transform: translateX(0);
    position: relative;
    background: transparent;
    transition: all 0s ease;
    top: -0.5rem;
  }
  .nav-list li {
    border: none;
    padding: 1rem;
    background: transparent;
  }
  .nav-list a {
    border-radius: 20px;
    padding: 1rem 2vw;
  }

  .overlay-visible {
    opacity: 0;
  }

  #about-container-outer {
    grid-template-columns: 1fr 2fr;
  }
  #image-container {
    max-width: none;
  }
  #contact-container {
    grid-template-columns: 1fr 1fr;
  }
}