:root {
  --primary-color: #2563eb;
  --primary-hover: #1d4ed8;
  --bg-color: #f8fafc;
  --card-bg: #ffffff;
  --text-color: #1e293b;
  --text-muted: #64748b;
  --border-color: #e2e8f0;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
}

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

body {
  font-family:
    system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", "Noto Sans",
    "Liberation Sans", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji",
    "Segoe UI Symbol", "Noto Color Emoji";
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.6;
}

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

header {
  background-color: var(--card-bg);
  border-bottom: 1px solid var(--border-color);
  padding: 3rem 0;
  margin-bottom: 2rem;
  text-align: center;
}

header h1 {
  font-size: 2.5rem;
  color: var(--primary-color);
  margin-bottom: 0.5rem;
}

.subtitle {
  font-size: 1.1rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.warning-box {
  background-color: #fffbeb;
  border: 1px solid #fcd34d;
  color: #92400e;
  padding: 1rem;
  border-radius: 0.5rem;
  max-width: 800px;
  margin: 0 auto 1.5rem auto;
  font-weight: 500;
}

.note {
  font-size: 0.9rem;
  color: var(--text-muted);
  font-style: italic;
}

.search-container {
  position: relative;
  margin-bottom: 2rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

#searchInput {
  width: 100%;
  padding: 1rem 3rem 1rem 1.5rem;
  font-size: 1.1rem;
  border: 2px solid var(--border-color);
  border-radius: 0.5rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}

#searchInput:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.search-icon {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
}

.filter-container {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
  margin-bottom: 2rem;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.filter-tag {
  background-color: #e2e8f0;
  color: var(--text-muted);
  padding: 0.5rem 1rem;
  border-radius: 9999px;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.2s ease;
  border: 1px solid transparent;
  user-select: none;
}

.filter-tag:hover {
  background-color: #cbd5e1;
}

.filter-tag.active {
  background-color: var(--primary-color);
  color: white;
  border-color: var(--primary-hover);
}

.filter-tag.dimmed {
  opacity: 0.5;
  background-color: #f1f5f9;
}

.filter-tag.hidden-tag {
  display: none;
}

.toggle-tags-btn {
  background: none;
  border: none;
  color: var(--primary-color);
  cursor: pointer;
  font-size: 0.9rem;
  text-decoration: underline;
  padding: 0.5rem 1rem;
  font-family: inherit;
  align-self: center;
}

.toggle-tags-btn:hover {
  color: var(--primary-hover);
}

#resultsCount {
  margin-bottom: 1rem;
  color: var(--text-muted);
  text-align: center;
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 0.75rem;
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s, box-shadow 0.2s;
  display: flex;
  flex-direction: column;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.card-question {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 1rem;
  line-height: 1.4;
}

.card-question a {
  color: var(--text-color);
  text-decoration: none;
  background-image: linear-gradient(
    120deg,
    rgba(37, 99, 235, 0.1) 0%,
    rgba(37, 99, 235, 0.1) 100%
  );
  background-repeat: no-repeat;
  background-size: 100% 0.3em;
  background-position: 0 88%;
  transition: background-size 0.25s ease-in;
}

.card-question a:hover {
  background-size: 100% 88%;
  color: var(--primary-color);
}

.card-answer {
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.card-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--border-color);
  padding-top: 1rem;
  font-size: 0.875rem;
}

.timestamp {
  color: var(--primary-color);
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.tags {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.tag {
  background-color: #f1f5f9;
  color: var(--text-muted);
  padding: 0.25rem 0.75rem;
  border-radius: 9999px;
  font-size: 0.75rem;
}

footer {
  text-align: center;
  padding: 2rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border-color);
  margin-top: auto;
}

@media (max-width: 640px) {
  .cards-grid {
    grid-template-columns: 1fr;
  }

  header h1 {
    font-size: 1.75rem;
  }
}