* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    line-height: 1.6;
    background-color: #f5f5f5;
    color: #333;
}

.container {
    max-width: 1000px;
    margin: 2rem auto;
    padding: 0 1rem;
}

h1 {
    text-align: center;
    color: #2c3e50;
    margin-bottom: 2rem;
}

.chat-container {
    background-color: white;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    overflow: hidden;
}

.chat-messages {
    height: 400px;
    overflow-y: auto;
    padding: 1rem;
    background-color: #f8f9fa;
}

.message {
    margin-bottom: 1rem;
    padding: 0.8rem 1rem;
    border-radius: 10px;
    max-width: 80%;
    word-wrap: break-word;
}

.message.user {
    background-color: #007bff;
    color: white;
    margin-left: auto;
}

.message.bot {
    background-color: #e9ecef;
    color: #212529;
}

.input-container {
    padding: 1rem;
    border-top: 1px solid #dee2e6;
}

.tabs {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
}

.tab-btn {
    padding: 0.5rem 1rem;
    border: none;
    background: none;
    cursor: pointer;
    font-size: 1rem;
    color: #6c757d;
    border-bottom: 2px solid transparent;
    transition: all 0.3s ease;
}

.tab-btn.active {
    color: #007bff;
    border-bottom-color: #007bff;
}

.input-section {
    display: none;
}

.input-section.active {
    display: block;
}

textarea {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid #dee2e6;
    border-radius: 5px;
    margin-bottom: 1rem;
    resize: vertical;
    min-height: 60px;
}

button {
    background-color: #007bff;
    color: white;
    border: none;
    padding: 0.8rem 1.5rem;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

button:hover {
    background-color: #0056b3;
    color: white;
}

input[type="file"] {
    margin-bottom: 1rem;
    width: 100%;
    padding: 0.5rem;
    border: 1px solid #dee2e6;
    border-radius: 5px;
}