h1, h2, h3 {
  /* 下に少しだけ余白を減らす */
  margin-bottom: -1.5em;
}

body {
    font-family: "Hiragino Sans", "Helvetica Neue", sans-serif;
    background: #f9fafb;
    margin: 0;
    padding: 20px;
}

.container {
    max-width: 800px;
    margin: auto;
    background: #fff;
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}

h1 {
    text-align: center;
    margin-bottom: 20px;
}

#chat-window {
    background: #f1f5f9;
    padding: 15px;
    border-radius: 8px;
    height: 300px;
    overflow-y: auto;
    white-space: pre-wrap;
    word-break: break-word;
    margin-bottom: 15px;
    font-family: monospace;
}

textarea {
    width: 97.5%;
    height: 60px;
    padding: 10px;
    margin-bottom: 10px;
    border-radius: 8px;
    border: 1px solid #ddd;
    /*resize: none;*/
}

button {
    padding: 10px 15px;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    margin-right: 10px;
    background: #2563eb;
    color: #fff;
}

button:hover {
    background: #1e40af;
}

.hidden {
    display: none;
}

#loading {
    text-align: center;
    font-weight: bold;
    color: #555;
    margin-bottom: 10px;
}

.download-buttons {
    margin-top: 10px;
    text-align: right;
}

#chat-window h1, #chat-window h2, #chat-window h3 {
    font-weight: bold;
    margin-top: 12px;
    margin-bottom: 8px;
}

#chat-window p {
    margin-bottom: 8px;
}

#chat-window code {
    background: #f3f4f6;
    padding: 2px 4px;
    border-radius: 4px;
    font-family: monospace;
}

#chat-window pre {
    background: #1e293b;
    color: #f8fafc;
    padding: 10px;
    border-radius: 6px;
    overflow-x: auto;
    font-size: 14px;
}

.footer {
    text-align: center;
    margin-top: 30px;
    font-size: 0.9em;
    color: #555;
}
.footer a {
    color: #0077cc;
    text-decoration: none;
}
.footer a:hover {
    text-decoration: underline;
}

@media print {
    body {
        -webkit-print-color-adjust: exact;
        print-color-adjust: exact;
    }
}