:root {
  --background-color: #141414;
  --surface-color: #1f1f1f;
  --primary-color: #3b82f6;
  --text-primary-color: #ffffff;
  --text-secondary-color: #a0a0a0;
  --border-color: #333333;
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica,
    Arial, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol';
}

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

html {
  font-size: 16px;
}

body {
  background-color: var(--background-color);
  color: var(--text-primary-color);
  font-family: var(--font-family);
  line-height: 1.6;
  margin: 0;
  padding: 1rem;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  color: var(--text-primary-color);
  margin-bottom: 0.75rem;
  line-height: 1.2;
}

p {
  margin-bottom: 1rem;
  color: var(--text-secondary-color);
}

a {
  color: var(--primary-color);
  text-decoration: none;
  transition: opacity 0.2s ease-in-out;
}

a:hover {
  opacity: 0.8;
  text-decoration: underline;
}

header {
  padding: 1rem 0;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 2rem;
}

.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  background-color: var(--primary-color);
  color: var(--text-primary-color);
  border: none;
  cursor: pointer;
  font-weight: bold;
  text-align: center;
  transition: background-color 0.2s ease-in-out;
}

.btn:hover {
  background-color: #2563eb;
  text-decoration: none;
}

.card {
  background-color: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
  transition: transform 0.2s ease-in-out, box-shadow 0.2s ease-in-out;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.3);
}

.search-bar {
  width: 100%;
  padding: 0.75rem 1rem;
  background-color: var(--surface-color);
  color: var(--text-primary-color);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  font-size: 1rem;
  margin-bottom: 1.5rem;
}

.search-bar::placeholder {
  color: var(--text-secondary-color);
}

.search-bar:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.4);
}

.progress-bar {
  width: 100%;
  height: 8px;
  background-color: var(--border-color);
  border-radius: 4px;
  overflow: hidden;
  margin-top: 0.5rem;
}

.progress-bar-inner {
  height: 100%;
  width: 0;
  background-color: var(--primary-color);
  transition: width 0.3s ease;
}

@media (min-width: 768px) {
  body {
    padding: 2rem;
  }

  .container {
    padding: 2rem;
  }

  h1 {
    font-size: 2.5rem;
  }
}