.chat-header-container {
    top: 0;
    padding: 1.5rem;
}

.chat-header-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

h1 {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    min-width: 0;
}

.new-chat-btn {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    border: none;
    background: #fff;
    color: #374151;
    font-size: 0.875rem;
    font-weight: 600;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
    cursor: pointer;
    transition: background 0.15s, box-shadow 0.15s;
    white-space: nowrap;
    flex-shrink: 0;
}

.new-chat-btn:hover {
    background: #f3f4f6;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1), 0 2px 4px rgba(0, 0, 0, 0.06);
}

.new-chat-icon {
    width: 1.125rem;
    height: 1.125rem;
}

@media (min-width: 768px) {
    .chat-header-container {
        position: sticky;
    }
}
