:root {
  color: #1f2933;
  background: #f6f5ef;
  font-family: "Noto Sans JP", "Yu Gothic", sans-serif;
  line-height: 1.8;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
}

header {
  background: #123c3a;
  color: #fff;
  padding: 36px max(24px, calc((100% - 860px) / 2));
}

header p,
header h1 {
  margin: 0;
}

header p {
  color: #d7e7dc;
  font-size: 14px;
}

header h1 {
  font-family: Georgia, "Yu Mincho", serif;
  font-size: 32px;
  font-weight: 600;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  margin-top: 14px;
}

a {
  color: #0b6962;
}

header a {
  color: #fff;
}

main {
  margin: 0 auto;
  max-width: 860px;
  padding: 44px 24px 72px;
}

h2 {
  color: #123c3a;
  font-size: 21px;
  margin-top: 36px;
}

ul {
  padding-left: 24px;
}

.notice {
  border-left: 4px solid #e7a33c;
  background: #fff8e8;
  padding: 12px 16px;
}

details {
  background: #fff;
  border: 1px solid #d6d7cf;
  border-radius: 8px;
  margin-top: 12px;
  padding: 14px 18px;
}

details + h2 {
  margin-top: 40px;
}

summary {
  cursor: pointer;
  font-weight: 600;
}

details p {
  margin-bottom: 0;
}

#ai-chat {
  background: #fff;
  border: 1px solid #d6d7cf;
  border-radius: 12px;
  padding: 16px;
  margin-top: 16px;
}

#ai-chat-log {
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-height: 420px;
  overflow-y: auto;
  padding: 4px 4px 8px;
}

#ai-chat-log:empty {
  display: none;
}

.ai-msg-row {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  max-width: 100%;
}

.ai-msg-row-user {
  justify-content: flex-end;
}

.ai-msg-row-ai {
  justify-content: flex-start;
}

.ai-msg-avatar {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: #0b6962;
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.ai-msg-col {
  display: flex;
  flex-direction: column;
  max-width: 75%;
}

.ai-msg-row-user .ai-msg-col {
  align-items: flex-end;
}

.ai-msg-row-ai .ai-msg-col {
  align-items: flex-start;
}

.ai-msg-user,
.ai-msg-ai {
  margin: 0;
  padding: 10px 14px;
  border-radius: 16px;
  line-height: 1.6;
  white-space: pre-wrap;
}

.ai-msg-user {
  background: #123c3a;
  color: #fff;
  border-bottom-right-radius: 4px;
}

.ai-msg-ai {
  background: #eef2ef;
  color: #1f2933;
  border-bottom-left-radius: 4px;
}

.ai-msg-time {
  font-size: 11px;
  color: #8a94a3;
  margin-top: 3px;
}

#ai-chat-form {
  display: flex;
  gap: 8px;
  margin-top: 8px;
}

#ai-chat-input {
  flex: 1;
  padding: 10px 14px;
  border: 1px solid #d6d7cf;
  border-radius: 20px;
  font-size: 15px;
  font-family: inherit;
}

#ai-chat-form button {
  padding: 10px 20px;
  border: none;
  border-radius: 20px;
  background: #0b6962;
  color: #fff;
  font-size: 15px;
  cursor: pointer;
}

#ai-chat-form button:disabled {
  opacity: 0.6;
  cursor: default;
}

#ai-chat-status {
  margin-bottom: 0;
  margin-top: 10px;
}

footer {
  border-top: 1px solid #d6d7cf;
  color: #52606d;
  font-size: 14px;
  padding: 20px 24px;
  text-align: center;
}

@media (max-width: 600px) {
  header {
    padding-top: 28px;
    padding-bottom: 28px;
  }

  header h1 {
    font-size: 27px;
  }

  main {
    padding-top: 32px;
  }
}