:root {
  --bg: #0f1724;
  --card: #0b1220;
  --muted: #cfc4c4;
  --accent: #4fd1c5;
  --glass: rgba(255, 255, 255, 0.08);
  --glass-border: rgb(255 255 255 / 69%);
  --text: #e6eef6;
  --br: #4cafef;
}

body {
  font-family: Arial, Helvetica, sans-serif;
  background-color: var(--bg);
  color: var(--text);
  margin: 0;
  background: #0f1724;
  overflow: hidden;
  color: var(--text);
  padding: 0;
  font-size: large;
}

.stars {
  position: absolute;
  width: 100%;
  height: 100%;
  background: transparent;
  background-image: radial-gradient(2px 2px at 20px 30px, #4fd1c5, transparent),
    radial-gradient(2px 2px at 40px 70px, #4cafef, transparent),
    radial-gradient(2px 2px at 50px 160px, #4fd1c5, transparent),
    radial-gradient(2px 2px at 90px 40px, #4cafef, transparent),
    radial-gradient(2px 2px at 130px 80px, #4fd1c5, transparent);
  background-size: 200px 200px;
  animation: moveStars 30s linear infinite;
}

@keyframes moveStars {
  from {
    background-position: 0 0;
  }
  to {
    background-position: -1000px 1000px;
  }
}
.container {
  width: 90%;
  max-width: 900px;
  margin: 20px auto;
  text-align: center;
}

.app-title {
  font-size: 2.5rem;
  font-weight: bold;
  color: var(--br);
  margin-bottom: 20px;
}

#welcomeText {
  font-size: 1.6rem;
  font-weight: bold;
  color: var(--accent);
  margin-bottom: 10px;
}

.quote {
  font-size: 1.2rem;
  color: var(--muted);
  font-style: italic;
  margin-bottom: 25px;
}

.form {
  background-color: var(--card);
  border-radius: 12px;
  padding: 15px;
  display: flex;
  align-items: center;
  gap: 10px;
  box-shadow: 0 4px 10px var(--glass);
  border: 1px solid var(--glass-border);
}

.input {
  padding: 12px;
  border: 1px solid var(--br);
  border-radius: 8px;
  flex: 1;
  background-color: var(--glass);
  color: var(--text);
}

.input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 8px var(--accent);
}

.add {
  border: none;
  background-color: var(--accent);
  color: var(--bg);
  padding: 12px 18px;
  border-radius: 8px;
  cursor: pointer;
  font-weight: bold;
  transition: 0.3s;
}

.add:hover {
  background-color: var(--br);
  color: var(--text);
}

.tasks {
  background-color: var(--card);
  margin-top: 20px;
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 4px 12px var(--glass);
  border: 1px solid var(--glass-border);
}

.tasks .task {
  background-color: var(--accent);
  padding: 12px;
  border-radius: 10px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: 0.3s;
  cursor: pointer;
  border: 1px solid var(--br);
  color: var(--bg);
}

.tasks .task:not(:last-child) {
  margin-bottom: 15px;
}

.tasks .task:hover {
  opacity: 0.9;
}

.tasks .task.done {
  background-color: var(--muted);
  border: 1px solid var(--glass-border);
  opacity: 0.5;
  text-decoration: line-through;
  color: black;
}

.tasks .task span {
  font-weight: bold;
  font-size: 12px;
  background-color: var(--br);
  color: var(--text);
  padding: 4px 8px;
  border-radius: 6px;
  cursor: pointer;
  transition: 0.3s;
}

.tasks .task span:hover {
  background-color: var(--accent);
  color: var(--bg);
}

@media (max-width: 768px) {
  .container {
    width: 95%;
  }
  .form {
    flex-direction: column;
    align-items: stretch;
  }
  .add {
    width: 100%;
  }
}

@media (max-width: 480px) {
  .form {
    padding: 10px;
  }
  .input {
    padding: 10px;
    font-size: 14px;
  }
  .add {
    padding: 10px;
    font-size: 14px;
  }
  .tasks {
    padding: 15px;
  }
  .tasks .task {
    padding: 10px;
    font-size: 14px;
  }
}

.auth-container {
  background-color: var(--card);
  padding: 30px;
  border-radius: 12px;
  box-shadow: 0 4px 12px var(--glass);
  border: 1px solid var(--glass-border);
  max-width: 400px;
  margin: 50px auto;
  text-align: center;
}

.auth-container h2 {
  margin-bottom: 20px;
  color: var(--accent);
}

.auth-container form {
  display: flex;
  flex-direction: column;
  gap: 15px;
}

.auth-container input {
  padding: 12px;
  border: 1px solid var(--br);
  border-radius: 8px;
  background-color: var(--glass);
  color: var(--text);
  font-size: 16px;
}

.auth-container input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 8px var(--accent);
}

.auth-container button {
  background: var(--accent);
  color: var(--bg);
  border: none;
  padding: 12px;
  border-radius: 8px;
  cursor: pointer;
  font-weight: bold;
  transition: 0.3s;
}

.auth-container button:hover {
  background: var(--br);
  color: var(--text);
}

.auth-container p {
  margin-top: 15px;
  color: var(--muted);
}

.auth-container a {
  color: var(--accent);
  text-decoration: none;
}