body {
  margin: 0;
  font-family: 'Segoe UI', Arial, sans-serif;
  background: #f4f6fb;
}
.container {
  max-width: 480px;
  margin: 40px auto;
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 4px 24px rgba(0,0,0,0.08);
  padding: 0 0 16px 0;
  display: flex;
  flex-direction: column;
  min-height: 80vh;
}
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 24px 0 24px;
}
header h1 {
  font-size: 1.3rem;
  margin: 0;
  color: #2a2a2a;
}
#startOverBtn {
  background: none;
  border: 1px solid #c0392b;
  color: #c0392b;
  border-radius: 6px;
  padding: 5px 12px;
  font-size: 0.82rem;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
  white-space: nowrap;
}
#startOverBtn:hover {
  background: #c0392b;
  color: #fff;
}
main#chatArea {
  flex: 1;
  padding: 18px 24px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.welcome-message {
  text-align: center;
  padding: 20px 16px 8px;
  border-bottom: 1px solid #eee;
  margin-bottom: 4px;
}
.welcome-icon {
  font-size: 2.5rem;
  margin-bottom: 8px;
}
.welcome-message h2 {
  font-size: 1.15rem;
  margin: 0 0 6px;
  color: #1a3a6b;
}
.welcome-message p {
  font-size: 0.92rem;
  margin: 0;
  color: #666;
  line-height: 1.5;
}
.message {
  max-width: 80%;
  padding: 12px 16px;
  border-radius: 16px;
  font-size: 1rem;
  line-height: 1.5;
  word-break: break-word;
}
.message.user {
  align-self: flex-end;
  background: #e6f0ff;
  color: #1a3a6b;
}
.message.bot {
  align-self: flex-start;
  background: #f0f0f0;
  color: #222;
}
form#chatForm {
  display: flex;
  gap: 8px;
  padding: 0 24px;
}
.input-wrap {
  flex: 1;
  position: relative;
  display: flex;
  flex-direction: column;
}
#charCount {
  font-size: 0.7rem;
  color: #aaa;
  text-align: right;
  margin-top: 2px;
  transition: color 0.2s;
}
#charCount.warn {
  color: #c0392b;
  font-weight: 600;
}
#userInput {
  flex: 1;
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid #d0d0d0;
  font-size: 1rem;
}
#chatForm button {
  background: #1a3a6b;
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 0 18px;
  font-size: 1rem;
  cursor: pointer;
  transition: background 0.2s;
}
#chatForm button:hover {
  background: #2952a3;
}
#chatForm button:disabled {
  background: #8a9abb;
  cursor: not-allowed;
}
#userInput:disabled {
  background: #f0f0f0;
  color: #999;
}
@media (max-width: 600px) {
  .container {
    margin: 0;
    min-height: 100vh;
    border-radius: 0;
  }
}

/* Memory toast */
#memoryToast {
  position: fixed;
  top: 16px;
  right: 16px;
  background: #1a3a6b;
  color: #fff;
  border-radius: 10px;
  padding: 10px 14px;
  min-width: 200px;
  max-width: 280px;
  font-size: 0.82rem;
  box-shadow: 0 4px 16px rgba(0,0,0,0.18);
  opacity: 0;
  transform: translateY(-8px);
  transition: opacity 0.3s ease, transform 0.3s ease;
  pointer-events: none;
  z-index: 1000;
}
#memoryToast.toast-show {
  opacity: 1;
  transform: translateY(0);
}
#memoryToast.toast-hide {
  opacity: 0;
  transform: translateY(-8px);
}
.toast-title {
  display: block;
  font-weight: 700;
  margin-bottom: 6px;
  font-size: 0.88rem;
}
#memoryToast ul {
  margin: 0;
  padding-left: 16px;
}
#memoryToast ul li {
  margin-bottom: 2px;
}