:root {
  --bg-color: #121212;
  --surface-color: #1e1e1e;
  --primary-color: #bb86fc;
  --primary-variant: #3700b3;
  --text-color: #e1e1e1;
  --text-secondary: #a0a0a0;
  --border-color: #333;
  --error-color: #cf6679;
}

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

body {
  font-family: "Inter", sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.6;
  display: flex;
  justify-content: center;
  padding: 2rem 1rem;
  min-height: 100vh;
}

main {
  width: 100%;
  max-width: 800px;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

header {
  text-align: center;
}

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

header p {
  font-size: 1.1rem;
  color: var(--text-secondary);
}

#topic-form {
  display: flex;
  gap: 0.5rem;
}

#topic-input {
  flex-grow: 1;
  padding: 0.75rem 1rem;
  font-size: 1rem;
  background-color: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-color);
  transition: border-color 0.2s, box-shadow 0.2s;
}

#topic-input:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(187, 134, 252, 0.25);
}

#topic-form button {
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  background-color: var(--primary-color);
  color: var(--bg-color);
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: background-color 0.2s;
}

#topic-form button:hover {
  background-color: #a050f0;
}

#suggested-topics-container h3 {
  color: var(--text-secondary);
  font-weight: 400;
  text-align: center;
  margin-bottom: 1rem;
}

#suggested-topics {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
}

.topic-button {
  padding: 0.5rem 1rem;
  font-size: 0.9rem;
  background-color: var(--surface-color);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  cursor: pointer;
  transition: all 0.2s;
}

.topic-button:hover {
  background-color: var(--border-color);
  color: var(--text-color);
}

#status-message {
  text-align: center;
  padding: 2rem;
  display: none;
  font-size: 1.1rem;
  color: var(--text-secondary);
}

#status-message.error {
  color: var(--error-color);
}

.loader {
  width: 48px;
  height: 48px;
  border: 5px solid var(--text-secondary);
  border-bottom-color: var(--primary-color);
  border-radius: 50%;
  display: inline-block;
  box-sizing: border-box;
  animation: rotation 1s linear infinite;
  margin: 0 auto 1rem auto;
}

@keyframes rotation {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

#results-container {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.category {
  background-color: var(--surface-color);
  border-radius: 8px;
  padding: 1.5rem;
  border: 1px solid var(--border-color);
}

.category h2 {
  margin-bottom: 1rem;
  color: var(--primary-color);
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.5rem;
  font-size: 1.5rem;
}

.result-item {
  padding: 0.75rem;
  border-radius: 6px;
  cursor: pointer;
  transition: background-color 0.2s;
  margin-bottom: 0.5rem;
}

.result-item:last-child {
  margin-bottom: 0;
}

.result-item:hover {
  background-color: rgba(255, 255, 255, 0.05);
}