* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: #121212;
    color: #ffffff;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.chat-container {
    width: 100%;
    max-width: 600px;
    background-color: #1e1e1e;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.5);
    display: flex;
    flex-direction: column;
    height: 85vh;
    overflow: hidden;
}

header {
    background-color: #2c2c2c;
    padding: 15px;
    text-align: center;
    border-bottom: 1px solid #333;
}

.chat-box {
    flex: 1;
    padding: 20px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.message {
    padding: 12px 15px;
    border-radius: 8px;
    max-width: 80%;
    line-height: 1.5;
}

.message.user {
    background-color: #0078d4;
    align-self: flex-start;
}

.message.bot {
    background-color: #333333;
    align-self: flex-end;
}

.input-area {
    display: flex;
    padding: 15px;
    background-color: #2c2c2c;
    border-top: 1px solid #333;
}

input {
    flex: 1;
    padding: 12px;
    border: none;
    border-radius: 6px;
    background-color: #444;
    color: white;
    outline: none;
}

button {
    margin-right: 10px;
    padding: 12px 20px;
    border: none;
    border-radius: 6px;
    background-color: #0078d4;
    color: white;
    cursor: pointer;
    transition: background 0.3s;
}

button:hover {
    background-color: #005a9e;
}