body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #0b1020;
  color: #f5f5f5;
}

.chat-container {
  max-width: 900px;
  margin: 40px auto;
  background: #141b2f;
  border-radius: 16px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.45);
  display: flex;
  flex-direction: column;
  height: 80vh;
  padding: 16px;
}

.chat-header {
  padding: 8px 4px 12px;
  border-bottom: 1px solid #2c3554;
}

.chat-header h1 {
  margin: 0;
  font-size: 1.8rem;
}

.chat-header .subtitle {
  margin: 4px 0 0;
  color: #c0c6e0;
  font-size: 0.95rem;
}

/* --- Controls bar --- */

.controls-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 10px;
  padding: 8px 4px;
  border-bottom: 1px solid #2c3554;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 0.85rem;
  color: #d3dbff;
}

.control-group select,
.control-group input[type="range"] {
  background: #0d1324;
  border-radius: 8px;
  border: 1px solid #2c3554;
  color: #f5f5f5;
  padding: 4px 8px;
  font-size: 0.85rem;
}

.secondary-button {
  align-self: flex-end;
  padding: 6px 12px;
  border-radius: 8px;
  border: 1px solid #2c3554;
  background: #1f2840;
  color: #f5f5f5;
  font-size: 0.85rem;
  cursor: pointer;
}

.secondary-button:hover {
  background: #273256;
}

/* --- Chat window --- */

.chat-window {
  flex: 1;
  margin-top: 10px;
  padding: 10px;
  overflow-y: auto;
  background: #0d1324;
  border-radius: 12px;
}

/* Message bubbles */

.msg-bubble {
  max-width: 75%;
  padding: 8px 12px;
  margin-bottom: 8px;
  border-radius: 12px;
  font-size: 0.95rem;
  line-height: 1.4;
}

.msg-bubble.user {
  margin-left: auto;
  background: #4c6fff;
  color: #ffffff;
  border-bottom-right-radius: 4px;
}

.msg-bubble.assistant {
  margin-right: auto;
  background: #1f2840;
  color: #f5f5f5;
  border-bottom-left-radius: 4px;
}

/* Input area */

.chat-input-area {
  display: flex;
  gap: 8px;
  margin-top: 12px;
  border-top: 1px solid #2c3554;
  padding-top: 8px;
}

.chat-input-area textarea {
  flex: 1;
  border-radius: 10px;
  border: 1px solid #2c3554;
  background: #0d1324;
  color: #f5f5f5;
  padding: 8px;
  resize: none;
  font-size: 0.95rem;
}

.chat-input-area button {
  padding: 8px 18px;
  border-radius: 10px;
  border: none;
  background: #4c6fff;
  color: white;
  font-weight: 600;
  cursor: pointer;
}

.chat-input-area button:hover {
  background: #3453e6;
}

/* Status text */

.status {
  margin-top: 6px;
  font-size: 0.85rem;
}

.status-info {
  color: #ffce56;
}

.status-ok {
  color: #8be48b;
}

.status-error {
  color: #ff8080;
}

/* Responsive */

@media (max-width: 768px) {
  .chat-container {
    margin: 0;
    border-radius: 0;
    height: 100vh;
  }

  .msg-bubble {
    max-width: 90%;
  }

  .controls-bar {
    flex-direction: column;
    align-items: flex-start;
  }

  .secondary-button {
    align-self: flex-start;
  }
}