body {
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', sans-serif;
    background-color: #1e1e2f;
    color: #f1f1f1;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
}

h1 {
    font-size: 2.5rem;
    margin: 1rem 0 0.5rem;
    color: #4fd1c5;
}

p {
    font-size: 1.2rem;
    margin: 0;
    color: #cccccc;
}

.btn {
    margin-top: 1rem;
    padding: 0.8rem 1.5rem;
    background-color: #4fd1c5;
    color: #1e1e2f;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: bold;
    transition: 0.3s ease;
}

.btn:hover {
    background-color: #3bb8ab;
}

.app {
    width: 100%;
    max-width: 1000px;
    margin-top: 2rem;
    display: flex;
    align-items: center;
}

.messagerie {
    display: flex;
    width: 100%;
    background-color: #2c2c3e;
    border-radius: 8px;
    overflow: hidden;
}

.left-panel {
    flex: 1;
    padding: 1rem;
    background-color: #2c2c3e;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

#searchZone {
    display: flex;
    gap: 0.5rem;
}

#searchInput {
    flex: 1;
    padding: 0.6rem;
    border-radius: 6px;
    border: none;
}

#conversationList {
    margin-top: 1rem;
}

.conversation {
    background-color: #3a3a52;
    padding: 0.6rem 1rem;
    border-radius: 6px;
    margin-top: 0.5rem;
    cursor: pointer;
    transition: background-color 0.2s ease;
}

.conversation:hover {
    background-color: #4fd1c5;
    color: #1e1e2f;
}

.sidebar {
    flex: 1;
    padding: 1rem;
    background-color: #2e2e44;
    border-left: 2px solid #4fd1c5;
    display: none;
    flex-direction: column;
    justify-content: space-between;
}

.sidebarHeader {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.chatContent {
    flex: 1;
    overflow-y: auto;
    margin: 1rem 0;
}

.chatInputZone {
    display: flex;
    gap: 0.5rem;
}

.chatInputZone input {
    flex: 1;
    padding: 0.6rem;
    border-radius: 6px;
    border: none;
}