* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: sans-serif;
}

body {
    background: #0f172a;
    color: white;
    height: 100vh;
}

.chat-container {
    display: flex;
    height: 100vh;
}

.sidebar {
    width: 260px;
    background: #111827;
    border-right: 1px solid #1f2937;
    padding: 20px;
}

.logo {
    font-size: 24px;
    font-weight: bold;
    margin-bottom: 30px;
}

.user-box {
    background: #1e293b;
    padding: 12px;
    border-radius: 10px;
}

.chat-box {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.messages {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
}

.message {
    background: #1e293b;
    margin-bottom: 15px;
    padding: 12px;
    border-radius: 12px;
}

.message-user {
    font-weight: bold;
    color: #60a5fa;
    margin-bottom: 5px;
}

.message-text {
    line-height: 1.7;
}

.message-time {
    margin-top: 8px;
    font-size: 12px;
    opacity: 0.7;
}

.input-area {
    display: flex;
    padding: 15px;
    background: #111827;
    border-top: 1px solid #1f2937;
}

.input-area input {
    flex: 1;
    padding: 14px;
    border: none;
    border-radius: 10px;
    outline: none;
    background: #1e293b;
    color: white;
}

.input-area button {
    margin-right: 10px;
    padding: 14px 20px;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    background: #2563eb;
    color: white;
}

.input-area button:hover {
    background: #1d4ed8;
}