body {
    margin: 0;
    font-family: system-ui, sans-serif;
    background: #f5f5f5;
}

header {
    background: #1b4f72;
    color: white;
    padding: 10px 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

header h1 {
    margin: 0;
    font-size: 20px;
}

nav a {
    color: #ffe;
    margin-left: 12px;
    text-decoration: none;
    font-size: 14px;
}

nav a:hover {
    text-decoration: underline;
}

main {
    padding: 16px;
}

/* Chat page */
.chat-container {
    max-width: 800px;
    margin: 0 auto;
    height: calc(100vh - 80px);
    display: flex;
    flex-direction: column;
}

.messages {
    flex: 1;
    background: white;
    border-radius: 6px;
    padding: 12px;
    overflow-y: auto;
    border: 1px solid #ddd;
}

.message {
    padding: 8px 10px;
    border-radius: 6px;
    margin-bottom: 8px;
    white-space: pre-wrap;
    word-wrap: break-word;
    font-size: 14px;
}

.message.user {
    background: #d6eaf8;
    align-self: flex-end;
}

.message.bot {
    background: #ebf5fb;
    align-self: flex-start;
}

.message.pending {
    font-style: italic;
    opacity: 0.7;
}

.chat-form {
    display: flex;
    margin-top: 10px;
    gap: 8px;
}

.chat-form input[type="text"] {
    flex: 1;
    padding: 8px;
    font-size: 14px;
    border-radius: 4px;
    border: 1px solid #ccc;
}

.chat-form button {
    padding: 8px 16px;
    font-size: 14px;
    border: none;
    border-radius: 4px;
    background: #1b4f72;
    color: white;
    cursor: pointer;
}

.chat-form button:hover {
    opacity: 0.9;
}

/* Upload page */
.upload-container {
    max-width: 600px;
    margin: 0 auto;
}

#upload-form {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

#upload-form input[type="file"] {
    padding: 6px 0;
}

#upload-form button {
    width: fit-content;
    padding: 8px 16px;
    background: #1b4f72;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

.upload-result {
    margin-top: 12px;
    font-size: 14px;
}