:root {
  --main-color: #969ff8;
  --second-color: #a0b0ff;
  --background-color: #1a0f4f;
  --light-color: #ffffff;
  --card-bg: #3949ab;
  --card-shadow: rgba(0, 0, 0, 0.4);
  --font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
}

html {
  scrollbar-color: var(--light-color) var(--main-color);
  min-height: 100%;
  min-width: 100%;
  font-family: var(--font-family);
  background: var(--background-color);
  color: var(--light-color);
}

body {
  margin: 0;
  padding: 20px;
}

header {
  text-align: center;
  margin-bottom: 40px;
  color: var(--main-color);
}

h1 {
  margin: 0;
  font-size: 2.5rem;
}

main {
  max-width: 1200px;
  margin: 0 auto;
}

.alphabet-nav {
  text-align: center;
  margin-bottom: 30px;
  font-weight: bold;
  color: var(--light-color);
}

.alphabet-nav a {
  text-decoration: none;
  font-size: 17px;
  margin: 0 6px;
  transition: color 0.2s;
  color: var(--light-color);
}

.alphabet-nav a:hover {
  color: var(--main-color);
  font-size: 18px;
  text-decoration: underline;
}

section {
  margin-bottom: 50px;
}

.letter {
  border-bottom: 2px solid var(--light-color);
  color: var(--light-color);
  padding-bottom: 5px;
  margin-bottom: 20px;
  font-size: 2rem;
}

.project-card {
  background: var(--main-color);
  text-align: center;
  border-radius: 8px;
  padding: 22px 20px;
  margin-bottom: 25px;
  box-shadow: 0 4px 10px var(--card-shadow);
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: transform 0.2s, box-shadow 0.2s;
  color: var(--background-color);
}

.project-card:nth-child(even) {
  background: var(--card-bg);
  color: var(--light-color);
}

.project-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 15px var(--card-shadow);
}

.card-title {
  margin: 0;
}

.link {
  font-size: 24px !important;
  background: var(--main-color) !important;
  margin: 0 !important;
  color: var(--background-color) !important;
}

.project-card:nth-child(odd) .link {
  background: var(--card-bg) !important;
  color: var(--light-color) !important;
}

.description,
.technology {
  margin: 0;
  font-size: 17px;
}

.description a {
  color: var(--light-color);
}

.technology {
  font-size: 18px;
}

.website-link,
.link {
  display: inline-block;
  padding: 6px 12px;
  border-radius: 5px;
  text-align: center;
  font-size: 20px;
  box-shadow: 0 0 5px var(--card-shadow);
  margin: 15px 0 10px 0;
  text-decoration: none;
  color: var(--light-color);
  background: var(--background-color);
  border-bottom: 2px solid transparent;
  transition: transform 0.2s, border-color 0.2s;
}

.website-link:hover,
.link:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 10px var(--card-shadow);
  border-bottom-color: var(--light-color);
}

img {
  max-width: 100%;
  border-radius: 10px;
  box-shadow: 0 0 5px var(--card-shadow);
}

#goTopBtn {
  display: none;
  position: fixed;
  bottom: 20px;
  right: 20px;
  z-index: 100;
  font-size: 40px;
  width: 50px;
  height: 50px;
  border: none;
  outline: none;
  background: none;
  color: var(--main-color);
  cursor: pointer;
  transition: all 0.3s;
}

#goTopBtn:hover {
  color: var(--light-color);
}

footer {
  text-align: center;
  position: relative;
  margin-top: 40px;
  font-size: 16px;
}

@media (max-width: 768px) {
  .alphabet-nav a {
    margin: 0 4px;
  }

  .project-card {
    padding: 15px;
  }
}