/* —— basic reset —— */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* —— body + fonts —— */
body {
  font-family: "Montserrat", Arial, Helvetica, sans-serif;
  color: #333;
  display: flex;
  justify-content: center;
}

.page-wrapper {
  width: 90%;
  max-width: 900px;
}

/* header */
.site-header {
  text-align: center;
  padding-top: 50px;
}

.site-title {
  font-size: 22px;
  font-weight: 500;
  margin-bottom: 10px;
}

/* chat window */
.chatbox {
  margin: 40px 0;
}

.chat-window {
  height: 360px;
  border: 1px solid #000;
  padding: 20px;
  font-size: 18px;
  line-height: 1.5;
  overflow-y: auto;
  background: #fafafa;
  white-space: pre-line;
}

/* messages */
.msg {
  margin-bottom: 14px;
  line-height: 1.5;
}

.msg.user {
  color: #000;
}

.msg.ai {
  color: #666666;
}

/* input row */
.chat-form {
  display: flex;
  gap: 12px;
  margin-top: 16px;
}

.chat-form input {
  flex: 1;
  padding: 12px;
  border: 1px solid #ccc;
  font-size: 18px;
}

.chat-form input:focus {
  outline: 2px solid #000;
  outline-offset: 2px;
}

.chat-form button {
  font-size: 18px;
  background: #000;
  color: #fff;
  border: none;
  padding: 12px;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background 0.3s;
}

.chat-form button .material-icons {
  font-size: 24px;
}

.chat-form button:hover {
  background: #666666;
}

.chat-form button:focus {
  outline: 2px solid #000;
  outline-offset: 2px;
}

/* visually hidden */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* footer */
.site-footer {
  margin: 60px 0 40px;
  text-align: center;
  font-size: 14px;
  color: #666;
}

.site-footer nav {
  margin-top: 12px;
}

.site-footer a {
  margin: 0 8px;
  color: #000;
  text-decoration: none;
}

.site-footer a:hover {
  color: #666666;
}