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

:root {
  --primary-color: #e74c3c;
  --secondary-color: #c0392b;
  --accent-color: #ff6b6b;
  --background: #f8f9fa;
  --card-bg: #ffffff;
  --text-primary: #2c3e50;
  --text-secondary: #7f8c8d;
  --border-color: #e1e8ed;
  --success: #27ae60;
  --error: #e74c3c;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  background-color: var(--background);
  color: var(--text-primary);
  line-height: 1.6;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px;
}

.auth-container {
  max-width: 450px;
  margin: 100px auto;
  background: var(--card-bg);
  padding: 40px;
  border-radius: 12px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.logo {
  text-align: center;
  margin-bottom: 30px;
}

.logo h1 {
  color: var(--primary-color);
  font-size: 2.5em;
  margin-bottom: 10px;
}

.logo p {
  color: var(--text-secondary);
  font-size: 0.95em;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  font-weight: 500;
  color: var(--text-primary);
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 12px 15px;
  border: 2px solid var(--border-color);
  border-radius: 8px;
  font-size: 1em;
  transition: border-color 0.3s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary-color);
}

.form-group textarea {
  resize: vertical;
  min-height: 100px;
}

.form-group small {
  display: block;
  margin-top: 5px;
  color: var(--text-secondary);
  font-size: 0.85em;
}

.btn {
  display: inline-block;
  padding: 12px 30px;
  background: var(--primary-color);
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 1em;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.3s, transform 0.2s;
  text-decoration: none;
  text-align: center;
}

.btn:hover {
  background: var(--secondary-color);
  transform: translateY(-2px);
}

.btn:active {
  transform: translateY(0);
}

.btn-block {
  width: 100%;
}

.btn-secondary {
  background: var(--text-secondary);
}

.btn-secondary:hover {
  background: #5a6c7d;
}

.text-center {
  text-align: center;
}

.mt-3 {
  margin-top: 20px;
}

.error {
  background: #fee;
  color: var(--error);
  padding: 12px;
  border-radius: 8px;
  margin-bottom: 20px;
  border: 1px solid var(--error);
}

.success {
  background: #efe;
  color: var(--success);
  padding: 12px;
  border-radius: 8px;
  margin-bottom: 20px;
  border: 1px solid var(--success);
}

.hero {
  text-align: center;
  padding: 80px 20px;
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
  color: white;
  border-radius: 12px;
  margin-bottom: 40px;
}

.hero h1 {
  font-size: 3em;
  margin-bottom: 20px;
}

.hero p {
  font-size: 1.3em;
  margin-bottom: 30px;
}

.card {
  background: var(--card-bg);
  border-radius: 12px;
  padding: 30px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  margin-bottom: 20px;
}

.card-header {
  font-size: 1.5em;
  font-weight: 600;
  margin-bottom: 20px;
  color: var(--primary-color);
}

.chat-container {
  display: flex;
  flex-direction: column;
  height: calc(100vh - 100px);
  max-width: 900px;
  margin: 20px auto;
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
  background: var(--card-bg);
  border-radius: 12px 12px 0 0;
  border: 2px solid var(--border-color);
}

.message {
  margin-bottom: 20px;
  padding: 12px 18px;
  border-radius: 12px;
  max-width: 70%;
}

.message.user {
  background: var(--primary-color);
  color: white;
  margin-left: auto;
  border-bottom-right-radius: 4px;
}

.message.llm {
  background: var(--background);
  color: var(--text-primary);
  margin-right: auto;
  border-bottom-left-radius: 4px;
}

.message-sender {
  font-size: 0.85em;
  font-weight: 600;
  margin-bottom: 5px;
  opacity: 0.8;
}

.chat-input-area {
  display: flex;
  gap: 10px;
  padding: 20px;
  background: var(--card-bg);
  border: 2px solid var(--border-color);
  border-top: none;
  border-radius: 0 0 12px 12px;
}

.chat-input-area input {
  flex: 1;
  padding: 12px 15px;
  border: 2px solid var(--border-color);
  border-radius: 8px;
  font-size: 1em;
}

.chat-input-area button {
  padding: 12px 25px;
}

.navbar {
  background: var(--card-bg);
  padding: 15px 0;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  margin-bottom: 20px;
}

.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.navbar .logo h2 {
  color: var(--primary-color);
  font-size: 1.8em;
}

.navbar nav a {
  margin-left: 20px;
  color: var(--text-primary);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.3s;
}

.navbar nav a:hover {
  color: var(--primary-color);
}

.profile-steps {
  margin-bottom: 30px;
}

.steps {
  display: flex;
  justify-content: space-between;
  margin-bottom: 30px;
}

.step {
  flex: 1;
  text-align: center;
  padding: 10px;
  background: var(--background);
  margin: 0 5px;
  border-radius: 8px;
  font-weight: 500;
  color: var(--text-secondary);
}

.step.active {
  background: var(--primary-color);
  color: white;
}

.step.completed {
  background: var(--success);
  color: white;
}

.tags-input {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 12px;
  border: 2px solid var(--border-color);
  border-radius: 8px;
  min-height: 50px;
}

.tag {
  background: var(--primary-color);
  color: white;
  padding: 5px 12px;
  border-radius: 20px;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 0.9em;
}

.tag button {
  background: none;
  border: none;
  color: white;
  cursor: pointer;
  font-size: 1.2em;
  line-height: 1;
}

.loading {
  text-align: center;
  padding: 20px;
  color: var(--text-secondary);
}

.tnc-box {
  background: #fff9e6;
  border: 2px solid #ffd700;
  border-radius: 8px;
  padding: 20px;
  margin: 30px 0;
}

.tnc-box h3 {
  color: var(--primary-color);
  margin-bottom: 15px;
}

.tnc-box ul {
  margin-left: 20px;
  margin-bottom: 15px;
}

.tnc-box li {
  margin-bottom: 10px;
}

@media (max-width: 768px) {
  .hero h1 {
    font-size: 2em;
  }

  .message {
    max-width: 85%;
  }

  .steps {
    flex-direction: column;
  }

  .step {
    margin: 5px 0;
  }
}