:root {
  /* Colors */
  --bg-gradient-turquoise: linear-gradient(to bottom right, hsl(174, 100%, 25%) 3%, hsl(174, 80%, 15%) 97%);
  --bg-gradient-jet: linear-gradient(to bottom right, hsla(240, 1%, 18%, 0.251) 0%, hsla(240, 2%, 11%, 0) 100%), hsl(240, 2%, 13%);
  --bg-gradient-turquoise-1: linear-gradient(to bottom right, hsl(174, 100%, 50%) 0%, hsla(174, 100%, 40%, 0) 50%);
  --bg-gradient-turquoise-2: linear-gradient(135deg, hsla(174, 100%, 50%, 0.251) 0%, hsla(174, 100%, 40%, 0) 59.86%), hsl(240, 2%, 13%);
  --border-gradient-turquoise: linear-gradient(to bottom right, hsl(174, 100%, 25%) 0%, hsla(174, 100%, 25%, 0) 50%);
  --text-gradient-turquoise: linear-gradient(to right, hsl(174, 100%, 50%), hsl(174, 100%, 40%));
  --jet: hsl(0, 0%, 22%);
  --onyx: hsl(240, 1%, 17%);
  --eerie-black-1: hsl(240, 2%, 13%);
  --eerie-black-2: hsl(240, 2%, 12%);
  --smoky-black: hsl(0, 0%, 7%);
  --white-1: hsl(0, 0%, 100%);
  --white-2: hsl(0, 0%, 98%);
  --turquoise: hsl(174, 100%, 50%);
  --light-gray: hsl(0, 0%, 84%);
  --light-gray-70: hsla(0, 0%, 84%, 0.7);

  /* Typography */
  --ff-poppins: 'Poppins', sans-serif;
  --fs-1: 24px;
  --fs-2: 18px;
  --fs-3: 17px;
  --fs-4: 16px;
  --fs-5: 15px;
  --fs-6: 14px;
  --fs-7: 13px;
  --fs-8: 11px;
  --fw-300: 300;
  --fw-400: 400;
  --fw-500: 500;
  --fw-600: 600;

  /* Shadow */
  --shadow-1: -4px 8px 24px hsla(0, 0%, 0%, 0.25);
  --shadow-2: 0 16px 30px hsla(0, 0%, 0%, 0.25);
  --shadow-3: 0 16px 40px hsla(0, 0%, 0%, 0.25);

  /* Transition */
  --transition-1: 0.25s ease;
  --transition-2: 0.5s ease-in-out;
}

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

a { text-decoration: none; }
li { list-style: none; }
img, ion-icon, a, button, time, span { display: block; }
button { font: inherit; background: none; border: none; text-align: left; cursor: pointer; }
input, textarea { display: block; width: 100%; background: none; font: inherit; }
::selection { background: var(--turquoise); color: var(--smoky-black); }
:focus { outline-color: var(--turquoise); }
html { font-family: var(--ff-poppins); }
body { background: var(--smoky-black); }

.sidebar, article {
  background: var(--eerie-black-2);
  border: 1px solid var(--jet);
  border-radius: 20px;
  padding: 15px;
  box-shadow: var(--shadow-1);
  z-index: 1;
}

.separator {
  width: 100%;
  height: 1px;
  background: var(--jet);
  margin: 16px 0;
}

.icon-box {
  position: relative;
  background: var(--border-gradient-turquoise);
  width: 30px;
  height: 30px;
  border-radius: 8px;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 16px;
  color: var(--turquoise);
  box-shadow: var(--shadow-1);
  z-index: 1;
}

.icon-box::before {
  content: "";
  position: absolute;
  inset: 1px;
  background: var(--eerie-black-1);
  border-radius: inherit;
  z-index: -1;
}

article { display: none; }
article.active {
  display: block;
  animation: fadeIn 0.5s ease forwards;
}

@keyframes fadeIn {
  0% { opacity: 0; transform: translateY(20px); }
  100% { opacity: 1; transform: translateY(0); }
}

.h2, .h3, .h4, .h5 {
  color: var(--white-2);
  text-transform: capitalize;
}

.h2 { font-size: var(--fs-1); }
.h3 { font-size: var(--fs-2); }
.h4 { font-size: var(--fs-4); }
.h5 { font-size: var(--fs-7); font-weight: var(--fw-500); }

.article-title {
  position: relative;
  padding-bottom: 7px;
}

.article-title::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 30px;
  height: 3px;
  background: var(--text-gradient-turquoise);
  border-radius: 3px;
}

.has-scrollbar::-webkit-scrollbar {
  width: 5px;
  height: 5px;
}

.has-scrollbar::-webkit-scrollbar-track {
  background: var(--onyx);
  border-radius: 5px;
}

.has-scrollbar::-webkit-scrollbar-thumb {
  background: var(--turquoise);
  border-radius: 5px;
}

.content-card {
  position: relative;
  background: var(--border-gradient-turquoise);
  padding: 15px;
  padding-top: 45px;
  border-radius: 14px;
  box-shadow: var(--shadow-2);
  z-index: 1;
}

.content-card::before {
  content: "";
  position: absolute;
  inset: 1px;
  background: var(--bg-gradient-jet);
  border-radius: inherit;
  z-index: -1;
}

main {
  margin: 15px 12px;
  margin-bottom: 75px;
  min-width: 259px;
}

.sidebar {
  margin-bottom: 15px;
  max-height: 112px;
  overflow: hidden;
  transition: var(--transition-2);
}

.sidebar.active { max-height: 405px; }

.sidebar-info {
  position: relative;
  display: flex;
  justify-content: flex-start;
  align-items: center;
  gap: 15px;
}

.avatar-box {
  background: var(--bg-gradient-turquoise);
  border-radius: 20px;
}

.info-content .name {
  color: var(--white-2);
  font-size: var(--fs-3);
  font-weight: var(--fw-500);
  letter-spacing: -0.25px;
  margin-bottom: 10px;
}

.info-content .title {
  color: var(--white-1);
  background: var(--onyx);
  font-size: var(--fs-8);
  font-weight: var(--fw-300);
  width: max-content;
  padding: 3px 12px;
  border-radius: 8px;
}

.info_more-btn {
  position: absolute;
  top: -15px;
  right: -15px;
  border-radius: 0 15px;
  font-size: 13px;
  color: var(--turquoise);
  background: var(--border-gradient-turquoise);
  padding: 10px;
  box-shadow: var(--shadow-2);
  transition: var(--transition-1);
  z-index: 1;
}

.info_more-btn::before {
  content: "";
  position: absolute;
  inset: 1px;
  border-radius: inherit;
  background: var(--bg-gradient-jet);
  transition: var(--transition-1);
  z-index: -1;
}

.info_more-btn:hover,
.info_more-btn:focus { background: var(--bg-gradient-turquoise-1); }

.info_more-btn:hover::before,
.info_more-btn:focus::before { background: var(--bg-gradient-turquoise-2); }

.sidebar-info_more {
  opacity: 0;
  visibility: hidden;
  transition: var(--transition-2);
}

.sidebar.active .sidebar-info_more {
  opacity: 1;
  visibility: visible;
}

.contacts-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.contact-item {
  min-width: 100%;
  display: flex;
  align-items: center;
  gap: 16px;
}

.contact-info {
  max-width: calc(100% - 46px);
  width: calc(100% - 46px);
}

.contact-title {
  color: var(--light-gray-70);
  font-size: var(--fs-8);
  text-transform: uppercase;
  margin-bottom: 2px;
}

.contact-info :is(.contact-link, time, address) {
  color: var(--white-2);
  font-size: var(--fs-7);
}

.social-list {
  display: flex;
  justify-content: flex-start;
  align-items: center;
  gap: 15px;
  padding-bottom: 4px;
  padding-left: 7px;
}

.social-item .social-link {
  color: var(--light-gray-70);
  font-size: 18px;
}

.social-item .social-link:hover { color: var(--turquoise); }

.navbar {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  background: hsla(240, 1%, 17%, 0.75);
  backdrop-filter: blur(10px);
  border: 1px solid var(--jet);
  border-radius: 12px 12px 0 0;
  box-shadow: var(--shadow-2);
  z-index: 5;
}

.navbar-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  padding: 0 10px;
}

.navbar-link {
  color: var(--light-gray);
  font-size: var(--fs-8);
  padding: 20px 7px;
  transition: color var(--transition-1);
}

.navbar-link:hover,
.navbar-link:focus { color: var(--turquoise); }

.navbar-link.active { color: var(--turquoise); }

.about .article-title { margin-bottom: 15px; }

.about-text {
  color: var(--light-gray);
  font-size: var(--fs-6);
  font-weight: var(--fw-300);
  line-height: 1.6;
}

.about-text p { margin-bottom: 15px; }

.service { margin-bottom: 35px; }

.service-title { margin-bottom: 20px; }

.service-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.service-item {
  position: relative;
  background: var(--border-gradient-turquoise);
  padding: 20px;
  border-radius: 14px;
  box-shadow: var(--shadow-2);
  z-index: 1;
  transition: transform var(--transition-1);
}

.service-item:hover { transform: scale(1.05); }

.service-item::before {
  content: "";
  position: absolute;
  inset: 1px;
  background: var(--bg-gradient-jet);
  border-radius: inherit;
  z-index: -1;
}

.service-icon-box { margin-bottom: 10px; }

.service-icon-box img { margin: auto; }

.service-content-box { text-align: center; }

.service-item-title { margin-bottom: 7px; }

.service-item-text {
  color: var(--light-gray);
  font-size: var(--fs-6);
  font-weight: var(--fw-300);
  line-height: 1.6;
}

.timeline { margin-bottom: 30px; }

.timeline .title-wrapper {
  display: flex;
  align-items: center;
  gap: 15px;
  margin-bottom: 25px;
}

.timeline-list {
  font-size: var(--fs-6);
  margin-left: 45px;
}

.timeline-item { position: relative; }

.timeline-item:not(:last-child) { margin-bottom: 20px; }

.timeline-item-title {
  font-size: var(--fs-6);
  line-height: 1.3;
  margin-bottom: 7px;
}

.timeline-list span {
  color: var(--turquoise);
  font-weight: var(--fw-400);
  line-height: 1.6;
}

.timeline-item:not(:last-child)::before {
  content: "";
  position: absolute;
  top: -25px;
  left: -30px;
  width: 1px;
  height: calc(100% + 50px);
  background: var(--jet);
}

.timeline-item::after {
  content: "";
  position: absolute;
  top: 5px;
  left: -33px;
  height: 6px;
  width: 6px;
  background: var(--text-gradient-turquoise);
  border-radius: 50%;
  box-shadow: 0 0 0 4px var(--jet);
}

.timeline-text {
  color: var(--light-gray);
  font-weight: var(--fw-300);
  line-height: 1.6;
}

.skills-title { margin-bottom: 20px; }

.skills-list { padding: 20px; }

.skills-item:not(:last-child) { margin-bottom: 15px; }

.skill .title-wrapper {
  display: flex;
  align-items: center;
  gap: 5px;
  margin-bottom: 8px;
}

.skill .title-wrapper data {
  color: var(--light-gray);
  font-size: var(--fs-7);
  font-weight: var(--fw-300);
}

.skill-progress-bg {
  background: var(--jet);
  width: 100%;
  height: 8px;
  border-radius: 10px;
}

.skill-progress-fill {
  background: var(--text-gradient-turquoise);
  height: 100%;
  border-radius: inherit;
  animation: fillProgress 2s ease forwards;
}

@keyframes fillProgress {
  0% { width: 0%; }
}

.filter-list { display: none; }

.filter-select-box {
  position: relative;
  margin-bottom: 25px;
}

.filter-select {
  background: var(--eerie-black-2);
  color: var(--light-gray);
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--jet);
  border-radius: 14px;
  font-size: var(--fs-6);
  font-weight: var(--fw-300);
}

.filter-select.active .select-icon { transform: rotate(0.5turn); }

.select-list {
  background: var(--eerie-black-2);
  position: absolute;
  top: calc(100% + 6px);
  width: 100%;
  padding: 6px;
  border: 1px solid var(--jet);
  border-radius: 14px;
  z-index: 2;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: 0.15s ease-in-out;
}

.filter-select.active + .select-list {
  opacity: 1;
  visibility: visible;
  pointer-events: all;
}

.select-item button {
  background: var(--eerie-black-2);
  color: var(--light-gray);
  font-size: var(--fs-6);
  font-weight: var(--fw-300);
  text-transform: capitalize;
  width: 100%;
  padding: 8px 10px;
  border-radius: 8px;
}

.select-item button:hover { color: var(--turquoise); }

.project-list, .certificates-list ul, .progress-list ul {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
  margin-bottom: 10px;
}

.project-item, .certificates-list .project-item, .progress-list .project-item { display: none; }

.project-item.active, .certificates-list .project-item.active, .progress-list .project-item.active {
  display: block;
  animation: scaleUp 0.25s ease forwards;
}

@keyframes scaleUp {
  0% { transform: scale(0.5); }
  100% { transform: scale(1); }
}

.project-img {
  position: relative;
  width: 100%;
  height: 200px;
  border-radius: 16px;
  overflow: hidden;
  margin-bottom: 15px;
}

.project-item > a:hover .project-img::before { background: hsla(0, 0%, 0%, 0.5); }

.project-item-icon-box {
  background: var(--jet);
  color: var(--turquoise);
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.8);
  font-size: 20px;
  padding: 18px;
  border-radius: 12px;
  opacity: 0;
  z-index: 1;
  transition: var(--transition-1);
}

.project-item > a:hover .project-item-icon-box {
  transform: translate(-50%, -50%) scale(1);
  opacity: 1;
}

.project-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition-1);
}

.project-item > a:hover img { transform: scale(1.1); }

.project-title, .project-category { margin-left: 10px; }

.project-title {
  color: var(--white-2);
  font-size: var(--fs-5);
  font-weight: var(--fw-400);
  text-transform: capitalize;
  line-height: 1.3;
}

.project-category {
  color: var(--light-gray-70);
  font-size: var(--fs-6);
  font-weight: var(--fw-300);
}

.progress-text {
  color: var(--light-gray);
  font-size: var(--fs-6);
  font-weight: var(--fw-300);
  line-height: 1.6;
  margin-left: 10px;
}

.contact-form { margin-bottom: 10px; }

.form-title { margin-bottom: 20px; }

.input-wrapper {
  display: grid;
  grid-template-columns: 1fr;
  gap: 25px;
  margin-bottom: 25px;
}

.form-input {
  color: var(--white-2);
  font-size: var(--fs-6);
  font-weight: var(--fw-400);
  padding: 13px 20px;
  border: 1px solid var(--jet);
  border-radius: 14px;
  outline: none;
}

.form-input:focus { border-color: var(--turquoise); }

textarea.form-input {
  min-height: 100px;
  height: 120px;
  max-height: 200px;
  resize: vertical;
  margin-bottom: 25px;
}

.form-btn {
  position: relative;
  width: 100%;
  background: var(--border-gradient-turquoise);
  color: var(--turquoise);
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 10px;
  padding: 13px 20px;
  border-radius: 14px;
  font-size: var(--fs-6);
  text-transform: capitalize;
  box-shadow: var(--shadow-3);
  z-index: 1;
  transition: var(--transition-1);
}

.form-btn::before {
  content: "";
  position: absolute;
  inset: 1px;
  background: var(--bg-gradient-jet);
  border-radius: inherit;
  z-index: -1;
  transition: var(--transition-1);
}

.form-btn:hover { background: var(--bg-gradient-turquoise-1); }

.form-btn:hover::before { background: var(--bg-gradient-turquoise-2); }

@media (min-width: 580px) {
  :root {
    --fs-1: 32px;
    --fs-2: 24px;
    --fs-3: 26px;
    --fs-4: 18px;
    --fs-6: 15px;
    --fs-7: 15px;
    --fs-8: 12px;
  }

  .sidebar, article { width: 520px; margin-inline: auto; padding: 30px; }
  main { margin-top: 60px; margin-bottom: 100px; }
  .sidebar { max-height: 180px; }
  .sidebar.active { max-height: 584px; }
  .service-item { display: flex; justify-content: flex-start; align-items: flex-start; gap: 18px; padding: 30px; }
  .service-content-box { text-align: left; }
}

@media (min-width: 768px) {
  .sidebar, article { width: 700px; }
  .project-list, .certificates-list ul, .progress-list ul { grid-template-columns: 1fr 1fr; }
  .filter-list { display: flex; justify-content: flex-start; align-items: center; gap: 25px; padding-left: 5px; margin-bottom: 30px; }
  .filter-item button { color: var(--light-gray); font-size: var(--fs-5); transition: var(--transition-1); }
  .filter-item button:hover { color: var(--turquoise); }
  .filter-item button.active { color: var(--turquoise); }
  .filter-select-box { display: none; }
}

@media (min-width: 1024px) {
  .sidebar, article { width: 950px; }
  .project-list { grid-template-columns: repeat(3, 1fr); }
}

@media (min-width: 1250px) {
  main { max-width: 1200px; margin-inline: auto; display: flex; justify-content: center; align-items: stretch; gap: 25px; }
  .main-content { min-width: 75%; width: 75%; margin: 0; }
  .sidebar { position: sticky; top: 60px; max-height: max-content; height: 100%; margin-bottom: 0; padding-top: 60px; }
  .sidebar-info { flex-direction: column; }
  .info_more-btn { display: none; }
  .sidebar-info_more { opacity: 1; visibility: visible; }
}